Vacuum Induction Melting Furnace: 2016

2016年12月30日星期五

Explanation using the intermediate frequency furnace technical specification for you

My company main circuit adopts expert explains to the intermediate frequency furnace device "ac - dc - ac transformation system by three-phase fully-controlled bridge rectifier circuit, inductance, wave circuit of inverter circuit in parallel, on the basis of the following:
(a), rated input devices: three-phase alternating current (ac), frequency of 50 hz (60 hz), line voltage is 380 v (high pressure equipment is 660 v, 750 v, 950 v, 1050 v, 1250 v, 1450 v, etc)
(2), equipment rated output: as shown in chart a; Under the rated voltage or rated load, the output power can be smooth, continuous adjustment, the adjustment range is 5% - 100% of the rated power;
(3), can prevent overvoltage switching operation (such as QF open and close, the RS fuse, etc.);
(4) when the output voltage 1.1 1.2 times better than the maximum output voltage or over voltage setting value, the overvoltage protection system action, make the device automatically stop working, and send out alarm signal, over voltage indicator light meter box;
(5) when the inverter bridge through short circuit protection system action immediately, make the automatic stop device, had concurrent flow indicator - flow indicator light meter box;
(6) as the output current more than setting value, the protection system also make the automatic stop device, had concurrent flow indicator - flow indicator light meter box;
(7) the water-cooling system working pressure is lower than a certain value, the function of automatic stop, and light up the water indicator on the panel;
(8) the machine set a limited flow, pressure limiting link, make the input current and output voltage limit within the set value.

2016年12月28日星期三

Induction melting furnace operation points and maintenance

The induction melting furnace maintenance and maintenance
1. The furnace body, instrument and control cabinet should be always kept clean.
2. The fire inflammable and explosive articles shall be stored in 2 m around.
3. The surface of the furnace shell paint should remain intact, besmear to brush on a regular basis.
4. The temperature higher than 400. 12, not for a long time to open the oven door.
5. Use the furnace temperature shall not exceed the maximum rated temperature.
6. Regular repair and improve the front seal measures.
7. To lubrication of mechanical transmission parts regularly.
8. Regularly check whether the graphite heater terminal clamp, and tighten.
9. The corrosive substance and moisture artifacts must not be into the furnace heating.
10. Graphite heater once connected to each other, there should be timely when the power is separated.
11. Regularly clean up furnace bottom residual scale and other impurities.
Of the maintenance of the induction melting furnace
Induction melting furnace heating power after school with furnace using the extension of time, the thermal resistance of heat insulation screen to smaller, volatilize electric heating element and resistance is larger, the influence of such factors as power should be appropriately increased. In production practice, with experience and determine the power calculation method as shown in figure 4, 15 for the graphite felt or refractory fiber felt heat insulation screen vacuum furnace volume and heating power relationship graph. According to the figure 1300 can be determined. The vacuum furnace heating power of the C. If metal heat insulation screen vacuum furnace, was to check the heating power of the need to increase by about 30%.
Heat insulation screen maintenance screen in vacuum furnace and heat insulation, heat preservation effect, sometimes as a fixed structure foundation of heater. Heat insulation screen structure in general there are four types: full metal heat insulation screen, mezzanine type screen, graphite felt heat insulation screen and mixed felt heat insulation screen. Different heat insulation screen, should grasp the key points in maintenance.

2016年12月23日星期五

Intermediate frequency furnace steelmaking has the following advantages

1 simple, intermediate frequency furnace equipment. Compared with electric arc furnace, intermediate frequency furnace itself does not need large furnace equipment, don't need a large furnace equipment (such as hydraulic pressure, rotating mechanism, etc.), also don't require a lot of water cooling system, so its monomer equipment investment is relatively low, the equipment is simple and easy to master.
2, only has the function of the steel because of intermediate frequency furnace, no oxygen blowing in steelmaking process, so don't oxygen generator and other large equipment, it can also save money.
3, due to the small size, medium frequency furnace height is low, so the factory also was much lower than other steelmaking workshop, therefore, its cost in the factory building construction is also less than other types of steelmaking plant.
4, small and intermediate frequency furnace capacity, production arrangement is more flexible, especially suitable for small single piece casting production.
5, in addition, power frequency furnace and its related technology level is low, short-term easy to grasp.
6, the most low-end products in the market demand is not high, intermediate frequency furnace comprehensive cost is lower than other steelmaking process.

2016年12月19日星期一

The principle of vacuum furnace and structure

Vacuum furnace is mainly composed of furnace, smoke tube, heating coil and a chimney. Using the negative pressure of steam heat exchange technology, the runtime will be used as heat medium of the liquid level control between the smoke and fire tube and the heating coil, the pressure in the furnace is made by high temperature exhaust gas pressure, operation and control the negative pressure condition. Full combustion of fuel burner, heating tube and the fire heat pipe is passed to the pot shell intermediate medium water, boiling water is heated by the liquid into gas phase evaporation, water vapor gradually filled with gas phase space of the furnace body, because the coil is the heating medium and the tube wall temperature is lower than the steam temperature, so that the vapor in the outside wall of the condensing coil, and the heat transfer medium to coil. After the condensation water in gravity whereabouts backwater space. Cycling heat process was realized. To take the negative pressure of heating furnace operations, mainly considering the security issue, the normal pressure will cause the high temperature furnace flue gas leakage, heat loss increase, not only will cause the destruction of the stove itself and the harm to personal safety.

2016年12月15日星期四

Vacuum induction melting furnace using the matters needing attention

For induction melting operation must be careful and cautious when, in the process of operation should be more pay attention to personal safety, at the same time providing protection equipment as well.
During vacuum induction melting operation part, should be carried out in accordance with the relevant operation process, if not in accordance with the operating rules, is easy to vacuum pump body is damaged, resulting in a serious accident, will not only harm health, life and damage to equipment will also have a certain role.
In smelting operation, should beware of electric shock, such as electrode, rotating electrode copper wires, copper power supply box with a certain capacity, so be sure to properly insulating protection, so it can avoid electric shock. At the same time also need to protect good eye, if the temperature is too high, need to cover the observation hole of the baffle, if is necessary, you will need to wear sunglasses.
In the smelting, attention should be paid to keep a good environment, pay attention to ventilation, need the mechanical pump out of the trachea leads to the outside of the window. To dry the floor at the same time also need, there is no water. In the whole process of smelting, shall guarantee the circulating water can be a normal cycle.

2016年12月12日星期一

A brief introduction of medium frequency melting furnace

Medium frequency melting furnace is a kind of will power frequency 50 HZ alternating current into intermediate frequency (above 300 HZ and 20 k HZ) power supply device, induction coil, deserve to go up and compensation capacitor, applying the principle of electromagnetic induction heating equipment, widely used in non-ferrous metal melting, heating.
Such as molten pig iron practice, ordinary steel, stainless steel, tool steel, copper, aluminum, gold, silver and alloy, etc.; Diathermy forging USES the steel parts, copper parts, used for extrusion forming of aluminum ingots, tempering, quenching heat treatment of metal. Medium frequency melting furnace heating device has small volume, light weight, high efficiency, the advantages of hot working quality and favorable environment, are quickly eliminated coal furnace, gas furnace and oil furnace and ordinary resistance furnace, is the new generation of metal heating equipment.
Medium frequency melting furnace is a main equipment in the foundry, stability, reliability and security of its work is flow process of casting production line ensure normal and stable work.

2016年12月8日星期四

Medium frequency induction furnace

Intermediate frequency furnace power supply system is one of the biggest amount of harmonic in power system harmonic source, common has the power of the medium frequency furnace and high frequency induction furnace. The six pulse intermediate frequency furnace, mainly produce 5, 7, 11, 13 second-class characteristic harmonic; For 12 pulse converter medium frequency furnace, mainly produce 11, 13, 23, 25 inferior characteristic harmonic. In general, small converter device adopts 6 pulse, relatively large adopts 12 pulse. Such as furnace transformer connect/delta Y/Y type, or to use two electric furnace transformer power supply.
For intermediate frequency furnace filter unit, we have many successful running of equipment. General design of two or more circuit, combined filtering methods for harmonic governance:
1, according to different medium frequency furnace, provide you with special filter and reactive power compensation of complete sets of equipment;
2, according to different management goal, the demand of the actual working condition, we reasonable design filter compensation scheme for you;
3, according to the actual number of intermediate frequency furnace and the load distribution, reasonable design is a single governance medium frequency furnace, or more than one centralized management;
4, according to your actual demand of industrial, we reasonable design filter compensation scheme for you, to meet the diverse needs of your industrial and mining.

2016年12月5日星期一

The structure of the medium frequency melting furnace

Medium frequency melting furnace furnace shell structure is divided into two kinds of aluminum and steel shell structure: small capacity furnace shell generally adopt aluminum alloy material, reasonable structure small volume, convenient installation, simple maintenance, low maintenance cost. Large capacity of intermediate frequency furnace shell adopts steel structure, furnace body structure is composed of the fixed frame of blast furnace and ontology, furnace fixed frame and the furnace USES the integrity of the skeleton structure. Furnace body is rotated by a hydraulic system control, depend on either side of the furnace to achieve two hydraulic cylinder jacking, and furnace is reset by the pressure of the furnace body weight of produce.
Furnace iron liquid height and diameter is quite high. This reference foreign advanced type furnace, furnace is set on the basis of computer analysis, slim than increase, improve natural power factor, power efficiency was improved. Furnace built-in copying yoke, magnetic yoke block can reduce the magnetic flux leakage, prevent furnace heating, improve efficiency. At the same time as supporting effect, induction coil, fixed yoke furnace to achieve high strength and low noise. Yoke is to use cold rolled silicon steel sheet, stainless steel plate produced by crescent-shaped yoke, the combination of core and coil surface for circular arc surface, pressure JinChu is a surface rather than a line in the past, the structure of the compaction effect is good, less magnetic flux leakage. For the silicon steel sheet pile, instead of a cast, a splint dedicated to tighten, without special wear heart screw tightening, this structure can make full use of the permeability of silicon steel sheet area, reduce the probability of local heating.

2016年12月1日星期四

Characteristics of medium frequency furnace melting furnace series

(1) melting with high efficiency power-saving effect is good, compact structure, strong overload capacity.
(2) low temperature around the stove, smoke less, good working environment.
(3) simple technology, melting operation and reliable operation.
(4) metal ingredients evenly.
(5) melting heat up fast, easy temperature control, high production efficiency.
(6) high utilization rate of intermediate frequency furnace, easy replacement of varieties.
(7) long arc yoke shielding magnetic flux leakage and reduce the external magnetic resistance, shielding at the ends of the coil magnetic flux leakage and magnetic yoke cross section is the inside of the arc at outside Wall seamless to increase the effective permeability area, make the better support. Unique positive and negative spiral coil greatly improve the efficiency of the system.

2016年11月28日星期一

Principle of intermediate frequency furnace by what job

How intermediate frequency furnace works, the principle of intermediate frequency furnace is what? , for example, put a metal cylinder has alternating medium frequency current in induction coil, metal cylinder has no direct contact with induction coil, electric coil temperature is very low, but the surfaces are heated to redness, and even melt, and the redness and melting speed as long as adjust the size and the strength of the current frequency can be achieved. If the cylinder on the coil center, surrounding the cylinder temperature is the same, the cylinder heating and melting did not produce harmful gases, light environmental pollution.
Here is to introduce: medium frequency furnace is a kind of will power frequency 50 HZ alternating current into intermediate frequency (above 300 HZ and 20 k HZ) power supply device, the three-phase alternating current (ac) power frequency, after rectification into direct current, then laid adjustable intermediate frequency electric current, direct current supply by capacitance and induction coil in through the intermediate frequency alternating current, generate high density magnetic field lines in the induction coil, induction coil, and cutting in cheng fang of metal materials, produce a lot of eddy current in the metal materials. The vortex also has some properties of intermediate frequency electric current, i.e., the metal itself free electrons in the resistance of the metal body flow to generate heat.

2016年11月24日星期四

A common use of vacuum furnace

A common use of vacuum heat treatment furnace steel alloy. Many applications involving heat treatment of steel, makes it tough, through a service of quenching and tempering. Sclerosis involving heat the steel to a predetermined temperature, and then rapidly cooling.
The application of vacuum furnace brazing ideal choice. Brazing is a kind of heat treatment process, the other is used to connect two or more base metal parts, through the filler metal melting thin layer in the space between them.
Further applications of vacuum furnace, vacuum carburizing, also known as the low pressure carburizing or LPC. In the process of gas (such as acetylene) was introduced to the temperature of the hot spots, usually in the partial pressure of 1600 f and 1950 f. Broken into its constituent elements (in this case, the carbon and hydrogen) gas. Carbon atoms, and then spread to the surface of the part of the area. Often repeat, the function of the input of the gas and the duration of the diffusion time. Work once the correct "shell", usually adopt oil or high pressure gas (HPGQ) normally, nitrogen or helium faster quenching induction quenching. This process is also known as case hardening.

2016年11月21日星期一

Resistance furnace and Intermediate frequency furnace for melting aluminum

Intermediate frequency furnace for melting aluminum has higher efficiency than the electric resistance furnace.
Medium frequency induction furnace to melt aluminum is based on the principle of electromagnetic induction heating, the heating efficiency can reach 0.59, and it can improve the melting rate by improving power.
The resistance type furnace with radiating heat to transfer Heat, according to the results of the previous design, the total efficiency is only 0.15 ~ 0.30.

2016年11月18日星期五

Several advantages of medium frequency furnace steelmaking

2016年11月16日星期三

The effect of vacuum induction furnace smelting process of high nitrogen steel

Restriction of nitrogen application is an important factor in the smelting of steel. Since nitrogen is gas elements, low solubility in the steel, the high nitrogen steel smelting usually adopt pressurized electroslag remelting and counter pressure casting process to complete, there are other USES the hot isostatic pressing melting, pressurized induction melting and powder metallurgy method, the smelting process all need special equipment, the high cost. How to take economic effective method for smelting high nitrogen steel has been closely watched.
Recently proposed by Chinese academy of sciences metal directly using vacuum induction furnace smelting high nitrogen steel technical route. In this process, with no positive pressure, could refine the nitrogen content in about 0.5% of the high nitrogen steel, and can effectively control the content of impurity elements in steel. Are currently in the process of high nitrogen steel vacuum induction furnace smelting various influence factors for further research.
A. The influence of alloy elements on the nitrogen content. The nitrogen solubility in the ferroalloy solution are greatly influenced by other alloy components. Different alloy on the nitrogen solubility in the steel has the effect of different coefficient, Cr, Mn, Mo, V, Nb elements such as increase the solubility of nitrogen, and elements such as Ni, Cu, Si, C reduce nitrogen solubility. With the activity coefficient can effectively measure of various elements on the influence of the nitrogen solubility in molten steel. According to the present the experimental results, adding chrome or manganese steel can effectively improve the nitrogen solubility.

2016年11月13日星期日

Vacuum induction furnace smelting principle and characteristics

Principle: the working principle of the induction furnace based on the electromagnetic induction heating principle and current. When alternating current through the induction coil, produce alternating magnetic field around the coil and furnace conductive material under the action of alternating magnetic field induced electric potential. Certain depth in the surface of furnace charge, a current (eddy current). Burden by eddy current heating melting. If furnace melting is a steel metal materials. The liquid steel in strong magnetic field caused by the effect of electromagnetic force strong movement. Magnetic field of the molten steel this effect is called electromagnetic stirring effect. The same horse coil produces A magnetic field within the crucible on two points, and B, as shown in figure 1, the power of the central due to the crucible magnetic field intensity is the largest. Crucible central pressure maximum, both ends up and down in turn reduce. The pressure of molten steel in furnace to produce movement.
Vacuum induction furnace is the induction crucible and mold release in the vacuum chamber, complete the smelting and casting in vacuum condition. Carried out under the vacuum smelting, due to the carbon and oxygen reaction products as the gas CO, the reaction to generate C0 direction, can make the carbon deoxidization ability and silicon, aluminum similar level. According to the law of gas dissolved in the liquid steel to square root, known under the vacuum smelting, is advantageous to the steel liquid to gas. For some high vapor pressure of alloy elements, such As B1, sn, Pb, As, zinc, etc., when the external pressure is reduced to less than the vapor pressure, change can be distilled from the alloy, which changes the poor performance of the steel and gold.

2016年11月11日星期五

Intermediate frequency furnace condenser cause of three kinds of damage and repair methods

Electric capacitor is used to compensate the reactive power of the intermediate frequency electric furnace, intermediate frequency electric furnace in because at high voltage large current work condition, reactive power electric capacitor need to use water, should be carefully maintenance, to ensure the normal working conditions. Usually the main reason for the damage of capacitor during maintenance of intermediate frequency furnace performance for the following aspects:
1. The intermediate frequency electric furnace overvoltage:
Lining thick 1.1: lead to high load change, decrease of power, the capacitor voltage fluctuation increases.
Too fast: 1.2 furnace in steel tie furnace in a short period of time, no molten steel in the hearth, furnace charge, the short circuit between the discharge frequency current caused by flashing, load resonant point drift amplitude is large, easy to cause short inverter Angle is too large, inverter voltage instantaneous rise.
Burden is 1.3: in the furnace after a period of time, current and frequency is very low, direct current resistance energy continuous recharge capacitance. If the load is lighter, capacitor of low frequency oscillation, easy to cause the capacitor over voltage single direction.
2. The intermediate frequency electric furnace overheating:
2.1 cooling water is unqualified, fouling can cause cooling capacity is insufficient, capacitor table core temperature difference is big, center of lower pressure. Water flow is insufficient, will cause a condenser temperature on the high side as a whole. Too strong to cause corrosion leakage of water cooling coil local point, cooling water mixed with insulating oil, which reduces the insulating ability greatly.
2.2 conductive loose pile head: electric capacitor because of the large current, lead to more pile head. For hot work and the steel cold alternating downtime, easy to cause the pile head is loose. Need to regularly check tighten screw.
2.3 environment temperature is too high, poor ventilation, environment temperature is too high, because of the water cooling coil to the capacitor shell, shell absorption of heat by coil away too, reduces the cooling capacity of cooling coil.
3. The intermediate frequency electric furnace over current:
3.1 ultra frequency: size of capacitor current, is proportional to the frequency. Usually in full furnace steel, damage of capacitor. Because with highest frequency furnace, electric current is the largest.
3.2 short circuit capacitor: a capacitor is a short circuit will cause a short circuit around the capacitor discharge, instantaneous large current is produced.

2016年11月9日星期三

Medium frequency melting furnace latest works

Working principle of the intermediate frequency furnace exactly is what look like? Please see below:
Working principle of medium frequency melting furnace are: three-phase bridge type all control the ac rectifier for dc rectifier circuit, after the flat wave reactor, became a constant dc current source, then through single phase inverter bridge, the dc current inverter with a certain frequency (generally between 1000 and 8000 hz) of single-phase medium frequency current. Load is composed of induction coil and compensation capacitor, connected in parallel resonant circuit. In general, can put the failure according to the failure phenomenon of intermediate frequency power supply is divided into completely unable to not work properly after starting and starting two kinds big. As a general principle, when fault occurs, should be in the case of power cuts a comprehensive inspection of the whole system, it includes the following aspects:
(a) power: use a multimeter to measure the main circuit switch (contact) whether there is electricity, and control the fuse behind this would rule out the possibility of these element circuit.
(2) of medium frequency melting furnace: rectifier rectifier adopts three-phase fully-controlled bridge rectifier circuit, which includes six quick fuse, six thyristor, six pulse transformer and a fly-wheel diode. On quick fuse has a red indicator, indicator when normal shrinkage in the shell, when burning of fuse break it will pop up, some of the fast fuse indicator is tight, when the fuse to burn, it get stuck inside, so, to be reliable, can use a multimeter discontinuity measure of fuse, to determine whether it burn out.

2016年11月3日星期四

Medium frequency melting furnace outstanding characteristic

1. Save electricity, energy saving, environmental protection, reduce the cost and manpower costs. Installation, debugging, and easy to operate, is quick to learn.
2. Super small volume, light weight, portable, covers an area of less than 1 square meters.
3.24 hours of uninterrupted smelting capacity.
4. Convenient change different quality, different materials, different ways of the furnace body, to adapt to all kinds of melting requirements.
5. Use subminiature medium frequency induction heating power supply, very different from the traditional medium frequency power supply.
6. Heat permeability good, uniform temperature.
7. Medium frequency melting furnace medium frequency magnetic field of molten metal has magnetic stirring effect, is beneficial to uniform composition and scum.
8. The recommended equipment and maximum amount of smelting, every furnace smelting time about 20 ~ 30 minutes.

2016年10月31日星期一

Medium frequency melting furnace 5 characteristics analysis

1, medium frequency melting furnace heating speed, less oxidation decarburization
Due to the principle of electromagnetic induction heating, the heat inside the workpiece itself, because the heating mode heat up fast, so few oxidation, high heating efficiency, process repeatability.
2, intermediate frequency furnace high degree of automation,
Can realize full automatic operation
Selection of automatic feeding and automatic discharging sorting device, coupled with a special control software, which can realize full automatic operation.
3, intermediate frequency furnace heating, temperature control precision is high
Small table is easy to realize uniform heating, core temperature requirements. Application of temperature control system can realize accurate control of temperature.
4, medium frequency melting furnace induction furnace easy replacement
According to different machining dimensions, the configuration of different specifications of the induction furnace. The furnace body are designed with water, electricity, quick change connectors make furnace replacement is simple, rapid and convenient.
5, intermediate frequency furnace low energy, no pollution
Induction heating compared with other heating mode, high heating efficiency, low energy consumption, no pollution; All the indexes can meet the requirements. Under the condition of heating, heat from room temperature to 1250 ℃ of tons of power consumption is less than 380 degrees.

2016年10月26日星期三

Medium frequency induction furnace performance characteristics

1. The central control circuit designed by computer optimization, optimum combination unit circuit, device performance is stable, reliable quality, strong anti-interference;
2. Coordinate element layout reasonable, convenient maintenance;
3. On the basis of zero voltage starting and strengthen the function of automatic frequency sweep repetition start, closely tracking the voltage and current loop circuit, equipment start and stop a smooth and stable, no current shock.
4. The inverter start signal by a single signal of high sensitive trigger circuit, further increases the starting performance of the equipment, equipment start-up success rate of 100%;
Constant power circuit control system, as the change of charge in the production of rapid automatic regulation of the voltage and current on the best set, do not need artificial regulation inverter cutoff Angle;
6. Has the perfect over voltage, over current, under voltage, water shortage, lack of phase, such as pressure limiting current limiting protection system, to ensure that the use of the equipment reliability and stability;
7. Medium frequency induction furnace is highly integrated circuit, debugging and operation are quick, simple, easy to learn.

2016年10月23日星期日

Medium frequency induction furnace safety protection

Medium frequency induction furnace is a kind of protection from layout about the safety of intermediate frequency electric furnace equipment first always start from four aspects.
In intermediate frequency induction furnace in hydraulic system. If the power supply time is very long, the metal in the furnace is likely to cool off, it will damage the furnace. If it is a power outage, demand with emergency system will be metal poured out. In order to fall protection furnace pressure loss situation, demand throttle valve at the inlet end device.
Medium frequency induction furnace, the cooling water system. Because the water is very important, simple form, so the demand for water is entering the cooling medium frequency power supply, water, cable, induction coil, and so on. Meanwhile, depicting the demand composite rule of cooling water in and out of the temperature, flow rate and pressure. Of course when the cooling water appear abnormal, perhaps beyond cooling water parameters Settings will announce the alarm.

2016年10月20日星期四

Induction furnace operation on several matters needing attention

1) induction furnace blow-in must first inspection before pushing, discharging device, water, air pressure is normal, limit switch, automatic and manual switch position is in the required position, check whether the workbench billet conform to the requirements of the forgings. Cooling water is the lifeline of induction furnace, the cooling water must always focus on, export water temperature shall not exceed 60 ℃.
2) start after the induction furnace, heating parameters, after waiting for heating parameters stable heating can be normal production.
3) cold furnace condition under-burnt clinker for the first time at work, should not be used immediately rated power, should use the normal power from 60% to 75% for low temperature heating, can avoid lining cracks, lining uniform temperature reaches 90 ℃, can enhance power to normal process power, formally began forging operations.
4) to correctly put billet in the process of loading, all burrs or deformation of big billet after processing must take place before furnace charging, and want to pay attention to loading method, place "horseshoe" upward, so as to avoid stuck very bad lining.
5) before the furnace and the work should not be on stage at the same time there are two parts of billet, residual billet heated furnaceman must under the shift into the container, indicating the billet size and status, the red material should finish forging furnace. Induction furnace is a kind of electric heating furnace, there are a lot of advantages: warming faster, less oxidation and decarburization, good working conditions, easy to realize mechanization and automation. But the size of billet shape change adaptability is strong enough. When the size of the blank shape changes within the specified requirements, such as shortening the length or added new billet size, etc., it can't just casually discharging pushing, must be conducted in accordance with the requirements of the design of the sensor discharging pushing related calculation, so as to ensure the quality of billet heating, otherwise will produce heat.

2016年10月17日星期一

Induction of intermediate frequency furnace lining life how should improve?

Induction hardening furnace has the good reputation in the heating equipment, exquisite workmanship, environmental protection, is a good tool for industrial production.
Induction of intermediate frequency furnace in the first and subsequent use in, all needs to play in furnace lining and to sintering. Lining on the need of raw materials and smelting differences can be divided into acidic and alkaline lining, lining, is to use data such as quartz sand, along the furnace wall to do a maintenance isolation layer melting materials and the induction coil inside the furnace body, maintain the induction coil. Lining should be pay attention to when, even force strong, a play, a molding. Lining after good need to the long time of low temperature bake, condensed into - a consolidate all, and has considerable strength, can melt fluid mixing and loading shock. Sintering, it shall comply with low power to slow warming air furnace, continue baking 36 hours, energetic condensation curing. Lining knot of black and white, is guaranteeing the main premise of the use of intermediate frequency electric furnace life and peace.
Lining knot, how accurate and reasonable operation is extended using medium frequency furnace life and guaranteeing the key of life and peace. - a condition, the operation before using the intermediate frequency electric furnace introspection, water cooling system, water can be sluggish, water pressure, water temperature of cooling water whether normal, whether for leaks, whether can normal task in the hydraulic system. Operation to do, be careful careful not to touch touch, one operator, one person's care, and it is strictly prohibited to other personnel to enter the room, avoid electric shock. Smelting process, we should use the boring, melting and feeding, often charging, when molten material melt in the furnace to demand should be real-time poured out, avoid high temperature add lining loss; Frequently check, when found a red body lateral picture, this is the precursor to leak furnace, should be in real time to accept the closure of intermediate frequency power supply, pour out the liquid, such as to prevent the leakage of furnace confound attack. Should also pay attention to in the use, and when found lining becomes very thin, means less than continuous use, should be hit lost old lining redo new lining, avoid missing furnace confound attack.
Other tasks for intermediate frequency furnace in high temperature, high voltage, large power flow. Therefore, should often clean the room, power supply and the dust of the induction coil cohesion copper platoon, contained in the avoid insulation to reduce attack problem. Often can reflect on the cooling water flow, the water pressure is normal. Schedule of the various components of the join fastening bolt, nut, avoid contact with bad destroyed parts. On schedule for water cooling system pump motor, the motor of the hydraulic pressure station, clean the hydraulic oil, guaranteeing the normal water supply and drainage equipment. Schedule of equipment of additional voltage and current for efficacy, avoid maintenance circuit spirit. Timely, accurate and careful maintenance is extension of intermediate frequency furnace using life and guaranteeing the main guarantee of peace.

2016年10月13日星期四

The development of vacuum induction furnace how?

The creation of the vacuum induction furnace and development plays an very important role in human progress. Appeared in the shang dynasty in China, relatively perfect copper smelting furnace, furnace temperature reached 1200 ℃, the stove inside diameter of 0.8 meters. In the spring and autumn period and the warring states period, people in molten copper furnace on the basis of further mastered the technology of improving furnace temperature, so as to produce the cast iron.
In 1794, the world appeared a straight cylindrical cupola melting cast iron. In 1864, after the French Martin by using the principle of the British Siemens regenerative furnace, built the first steel open hearth is heated with gas fuel. He used the regenerator to high temperature of air and gas, so as to ensure the steel needed for the temperature above 1600 ℃. Around 1900, power supply sufficient gradually, started to use a variety of resistance furnace, electric arc furnace and cored induction furnace.
In the 20th century 50 s, coreless induction furnace to get rapid development. Then the electron beam furnace, the use of electron beam to impact solid fuel, can strengthen the surface heating and melting of the high melting point materials. Used to forge heating furnace was first hand forge, the working space is a concave groove, groove filling in coal, combustion with air from the bottom of the tank for the artifacts buried heating in the coal. This furnace thermal efficiency is very low, the heating quality is not good, and only small workpiece heating, after development for refractory brick build by laying bricks or stones becomes close partly or fully enclosed chamber of a stove or furnace chamber furnace, can use coal, gas or oil as fuel, also can use electricity as a heat source, the artifacts in the chamber of a stove or furnace heating.
To facilitate heat large workpiece, again is suitable for heating ingot and billet bogie hearth furnace, heat for long bar also appeared well type furnace. After the 1920 s appeared to raise the productivity of the furnace and improving working conditions of mechanization, automation of furnace type. Industrial furnace fuel also as fuel resources development and the progress of fuel conversion technology, and by using solid fuels such as coal, coke, coal gradually convert producer gas, city gas, natural gas, gas and liquid fuels such as diesel oil, fuel oil, and developed and that meet the needs of all kinds of fuel used in combustion devices.

2016年10月11日星期二

Built-in vacuum furnace temperature uniformity test system

For the vacuum heat treatment equipment without temperature testing hole cannot be tested or vacuum furnace temperature test of complex due to the reason of its structure, design the online test system and test online.
Temperature in heat treatment process parameters is of vital importance, and temperature uniformity are important parameters of heat treatment process of heat treatment furnace requirements. At present, the domestic part of the vacuum heat treatment plant equipment without temperature uniformity measurement inspection hole, cause not through an external device, the measurement of temperature uniformity and system accuracy test. Another part of the vacuum heat treatment equipment test hole made on the equipment, but detection equipment damage, destruction furnace, some of the vacuum furnace heating element is composed of expensive components such as molybdenum, once broken, it brings huge economic losses, and even to temperature field uniformity testing work, the existing test methods is also very complicated.
Through to the device using the method and the working principle is analyzed, using built into, the measurement of temperature uniformity in the vacuum furnace, thermocouple data collector and the heat insulation box in the heat treatment furnace frame, the station frame according to the requirements of each customer testing techniques to customize, loading test for temperature field in the vacuum furnace, thermocouple data collector for parameter setting, including the acquisition time, acquisition interval and thermocouple type, etc., the internal temperature uniformity testing. System composition and the built-in vacuum furnace temperature on-line detection system is introduced in this paper is mainly composed of thermocouple data collector, heat insulation and the test of thermocouple.

2016年10月8日星期六

The structure of the vacuum induction melting furnace

Vacuum induction melting furnace equipment is mainly composed of furnace shell, sensors, crucible, tilting furnace mechanism, mold, power supply device, and the water cooling system, etc. On the furnace shell for observation, temperature, feed, such as sampling, mash material device. Outside the furnace body is equipped with vacuum system, power supply system and control system, etc. Vacuum induction melting furnace with batch and semi-continuous type two kinds, but make it vertical or horizontal.
Vacuum induction melting furnace should be considered in the structural design of the important issues is to avoid vacuum discharge, therefore to the furnace shell all charged body need to be treated with insulation, and sensors in the structure should be no sharp corners, burrs and sharp edges.

2016年9月29日星期四

The revelation of intermediate frequency furnace high and new technology

My company production of intermediate frequency furnace, forging heating furnace and heating of metal heat treatment and other complete sets of equipment, vacuum furnace is widely used in aerospace, metallurgy, machinery manufacturing, petrochemical industry, weapon, railway, automobile, electrolytic aluminium, and other fields, the professional design team cooperates with domestic famous universities and scientific research units to fully, proceed from customer position and practical application demand, continuous innovation, research and development of many in the industry leading level of new products.
Medium frequency induction furnace is controlled by frequency conversion device, furnace, furnace before, such as a few parts. Thyristor medium frequency power supply is the three-phase alternating current (ac) power frequency after rectifying circuit into direct current, then through the inverter circuit output for single phase medium frequency ac supply medium frequency coreless induction furnace, and then using the electromagnetic induction principle, artifacts in the alternating magnetic field of eddy current heating, smelting, quenching, such as heating heating requirements.
Intermediate frequency furnace performance characteristics: due to the principle of intermediate frequency induction heating furnace for electromagnetic induction, the quantity of heat is produced due to the artifact itself, fast heating, the heating way, few oxidation, high heating efficiency, process repeatability, the metal surface is only very slight discoloration, mild polishing can restore the surface mirror bright, thus effectively get constant material properties. With perfect over voltage, over current, under voltage, water shortage, lack of phase, such as pressure limiting current limiting protection system, to ensure that the use of the equipment reliability and stability; Highly integrated circuit scheme, debugging and operation are quick, simple, easy to learn.

2016年9月26日星期一

Induction heating equipment debugging and maintenance

Our company not only provide professional induction quenching furnace process, at the same time also has a strong after-sales service center, ensure long-term and wide range of system services. For the enterprise production problems and difficulties encountered in providing guidance to help. We believe that through our continuous efforts and pursuit, in the familiar induction heating field to provide users with value services. So how do the induction heating equipment for installation? How to debug? Routine maintenance and how effective? Today let's detailed answers:
1. Check the contact line of ac contactor ablation, loose connection or not.
2. Measure the insulation of the cooling water resistance. With the ohmmeter measuring tube set of the resistance to ground water, the minimum should be not less than 300 check evaporation pan of evaporative cooling electronic value, its resistance to earth should not be less than 600 kq.
3. The valve gate and the filament cooling water hoses (generally for rubber hose), near the - end of the tube heated easy ageing, be timely replacement for aging to the broken pipe.
4. To make a case internal cleaning the dust, wipe dust on the hv porcelain and insulation support. Note for centrifugal fan damper wire sweep the dust on the net, in order to avoid air volume reduced after the air inlet is blocked.
Using medium frequency furnace technology, can make the best comprehensive mechanical properties of castings, the indicators exceed national standard, effect is good, is the first choice for heating industry products.

2016年9月21日星期三

Vacuum furnace should be how to safely operate?

Vacuum oil quenching furnace is a kind of vacuum furnace, in the industry has been widely used in machinery, electronics, metallurgy and other industries, because is associated with the industry of these mechanical precision, so the vacuum oil quenching furnace operation specification is very important, if not careful may appear a lot of problems. Under the expert to tell you how should for safe operation, how to operate is in conformity with the specification!
1. Pay attention to safety electricity, using low pressure vacuum furnace, but there are still 380 v, so pay attention to safety electricity or very be necessary.
2. In production engineering, must ensure that no leakage, no leaking. Vacuum furnace of the furnace and furnace cover sealing is to use rubber parts, so need a cooling water interlayer. If there is a water leak to inside the furnace, furnace temperature is very high, will cause explosion.
3. Vacuum furnace processing of the workpiece, be sure to clean the oil on the surface of the clean, also should avoid quenching tank oil vapor into the furnace. After the oil vapor and air mixture can form explosive, once a fire or electricity will generate explosion, so vacuum furnace oven door should be closed after loading, after into the vacuum chamber of a stove or furnace, can electrify heats.
Vacuum oil quenching furnace has the advantages of good quality energy saving, safe and less polluting, so be sure to make full use of rise, want to make full use of rise, first must abide by the operation specification, safety operation, standardize the operation.

2016年9月19日星期一

The structure characteristics of the vacuum melting furnace

The structure characteristics of the vacuum furnace mainly includes:
(1) strictly vacuum seal. Metal products for sintering or heat treatment are conducted in airtight vacuum furnace, so the furnace to obtain and maintain the original air leakage rate, ensure vacuum degree of vacuum furnace, and to ensure the quality of the products have very important significance. To ensure the vacuum performance of vacuum furnace, in vacuum furnace design must follow the basic principle is: furnace should use airtight welding; Opening or less as far as possible on the furnace body is not opening; Less use or avoid use dynamic seal structure to minimize the vacuum leak; Installed on the furnace accessories, such as water-cooled electrodes, thermocouple device must be designed sealing structure is deduced.
(2) heating and insulation material can only be used in the vacuum state. Vacuum resistance furnace heating and insulation work under high temperature and vacuum, resistance to high temperature, low steam are put forward for the material, radiation effect is good, and the requirements of small coefficient of thermal conductivity, the hangzhou oxidizing request is not high. Vacuum resistance furnace is widely used tungsten, aluminum, tantalum, and heating and thermal insulation materials such as graphite, and the material under the atmospheric conditions extremely easy oxidation, generally do not use them as regular resistance furnace heating material.
(3) the cooling unit. Vacuum furnace, furnace shell, furnace cover, electric heating element guiding device (water-cooled electrodes), middle vacuum hot insulation parts are in the condition of vacuum, heating work, in order to guarantee the structure deformation of parts, vacuum sealing ring heat, not burning, not all the parts should be set according to different situations water-cooling device, in order to ensure the normal operation of the furnace and have enough life.
(4) with low voltage, high current. When the vacuum degree within the scope of 0.1 a IO0Pa, under the high voltage electric conductor can produce glow discharge phenomenon, serious can produce arc discharge that burned electric heating element, insulation, etc. As a result, the working voltage of vacuum furnace electric heating element is generally not more than 80-100 - v. At the same time, the electric heating element structure design to take some effective measures, such as to avoid a cutting-edge parts, electrode spacing cannot be too small.
(5) requires a high degree of automatic.

2016年9月15日星期四

Vacuum degree of vacuum induction furnace how much is the best

Many people think that the higher the vacuum degree of vacuum induction furnace, workpiece processing effect is better, actually otherwise, the vacuum degree of vacuum furnace should be based on the workpiece and the kinds of materials to decide, only chose the proper vacuum degree, will receive good effect.
When the pressure is less than the temperature of the vapor pressure, metal can produce evaporation (sublimation) phenomenon, like camphor in air by sublimation from solid evaporate into a gas. The smaller the outside pressure, the vacuum degree is higher, the easier it is to evaporate. So in vacuum heat treatment furnace, due attention must be paid to the problem of evaporation, think as long as to improve the vacuum degree of vacuum furnace, can achieve good effect of view is not comprehensive, must according to the types of artifacts, full attention to the problem of evaporation. Namely according to the alloy elements in the material being processed in the vacuum furnace of vapor pressure and heating temperature, to select the appropriate vacuum degree, in order to prevent the vacuum evaporation of alloy elements. As long as the vacuum degree of vacuum furnace choice is appropriate, is to prevent evaporation of alloy elements.
When heated in vacuum furnace, also can consider according to the types of metal materials, ventilation with inert gases, high purity or reverse gas to adjust the vacuum furnace, with a low vacuum heating method to prevent evaporation of the alloying elements, ventilation with high purity of inert gas can not only adjust the vacuum degree, and as a result of the existence of inert gas, form convection circulation, more conducive to the material evenly heating.

2016年9月12日星期一

Induction heating equipment to let you have to trust the five virtues

My company is not the first batch of domestic induction induction heating equipment enterprises, is the present domestic induction heating equipment in the industry word-of-mouth good, the biggest market share, that my company is how to get such big market achievement? Actually in the final analysis is compared to the other induction heating equipment manufacturing enterprise of five advantages:
First, the technology advantage. In technology, the production of induction induction heating equipment, medium frequency induction heating equipment automation equipment absorbed | products of new technology of Japan, Germany and then experienced engineers to optimize its reform continuously, the efficiency of the induction heating equipment, automated significantly increased, the stability of the induction heating equipment guaranteed;
Second, a performance advantage. In performance, for many years of technology import and independent innovation, make the induction inductive heating equipment more perfect function, higher degree of automation, performance compared to other manufacturers of induction inductive heating equipment performance is higher;
Third, the quality advantage. On the quality, the use of induction heating equipment industry the highest production standards, and the parts acceptance to guard a pass strictly, set up production key parts of induction heating equipment factory for processing, make the induction heating equipment spare parts quality is absolutely reliable guarantee;
Fourth, service advantages. On services, provide comprehensive services to the customers, help customers design and production processes, to provide technical support, to help installation and debugging equipment, later also can provide all kinds of induction heating equipment accessories, one-stop service to eliminate the customer's worries;
Fifth, the price advantage. On price, employ the most excellent talents, streamline personnel, using modern management system, shrinking production, management, operation costs, make sure that customers enjoy the most valuable induction of inductive heating equipment.

2016年9月9日星期五

What are the main characteristics of vacuum induction furnace?

What are the main characteristics of vacuum induction furnace. The pressure inside the chamber of a stove or furnace smoke into industrial furnace is lower than the atmospheric pressure. Vacuum furnace heating power, the heated workpieces appearance no oxidation, no decarburization, small deformation, the mechanical performance is good. Use the vacuum furnace smelting metal is beneficial to remove impurities, less finished pinhole, segregation of small, good quality. Vacuum furnace is suitable for the high quality, high purity, refractory metal melting and heating, such as tungsten, molybdenum, tantalum, niobium, titanium, heat-resistant alloy steel exercise and magnetic materials, electrical materials of high strength steel, stainless steel, tool steel and die steel, heat treatment.
Vacuum furnace usually by the chamber of a stove or furnace, heating equipment, sealing furnace shell, vacuum system, power supply system and temperature control system, etc. Sealing furnace shell made of carbon steel or stainless steel welding is removable parts of joint face seal with vacuum sealing material. In order to avoid heated furnace shell deformation and disintegration sealing material is heated, usually with water-cooled or air-cooled cooling furnace shell. Chamber of a stove or furnace located sealing furnace shell. According to use the stove, inside the furnace is equipped with different types of heating element, such as resistance, electrode and electron gun. Metal smelting in a crucible furnace, vacuum furnace of some manipulator with active casting equipment and loading. Vacuum system is mainly composed of vacuum pump, vacuum valves and vacuum gauge, etc.

2016年8月30日星期二

What factors affect the vacuum induction furnace temperature to transfer

Based on the temperature field distribution equations, the internal heating type vacuum furnaces throughout the distribution of temperature field, the first depends on several aspects. The data evenly into the thermal conductivity of data of uniform density P and uniform than hot melt. Affect the vacuum furnace temperature outward transfer elements, include the following three points:
A, the strength of the furnace heating element, in the planning, first choose inner heat source. Internal heat source heating, temperature, from inside to outside. The strength of intrusive directly affect the temperature distribution in the furnace condition. By (5) type to be able to see, when the higher the heat inside roar must point the higher the temperature, temperature difference (delta T) must be together to spread area (r). So, in the process of produce practice, i.e. after manipulation of the core of appearance load furnace core power manipulation of the temperature distribution in the furnace.
Second, the response of material from the furnace core intervals (delta r), as the core power will be punctual, that is the strength of the inner heat source will be punctual, and interval of furnace core is more far the response of materials, the lower the temperature, can not reach the required temperature response. As close to the furnace core intervals, the higher the temperature, the more conducive to echo.
Third, the burden of the cooling function, burden of heat dissipation function better, internal heat to the faster loss, heat loss in the reaction of material, easily causes must point temperature drop. But if echo is expected to heat dissipation function owe good, heat is needed for convergence, allows heat to pass time longer, is advantageous to the reaction of material to absorb heat and response to, progress must point temperature. Should have under the condition of high vacuum (pa) 4 ~ 13, reaction temperature 1200 ℃ or so, core temperature will soon be able to reach the required value, thus the length of the response time depends on the reaction of material thickness, namely the interval of reaction furnace core periphery expect furnace insulation layer. Can after planning furnace scale manipulation of the power supply.

2016年8月26日星期五

Nine items that should pay attention to maintenance of vacuum induction furnace

Yet how many people know that vacuum induction furnace correct maintenance method? The following is to detailed introduction:
1, after the work, needs to keep in vacuum induction furnace 133 pa vacuum.
2, there is dust or not clean inside the equipment, application of alcohol or gasoline wet silk cloth to wipe clean and dry.
3, sealing parts, parts disassembling, application of aviation gasoline or alcohol to clean, dry vacuum grease on besmear after reload.
4, equipment outside surface should often wipe, clean clean. The same is true of the use of vacuum tempering furnace.
5, electric control system of electric connection should be kept clean, fastening, in each furnace should check before fastening electric connection.
6, should check the insulation resistance of the furnace, when insulation resistance less than 1000 euro, should carefully check the electric heating element, electrode and isolation layer thermal resistance, etc., and troubleshoot rear can furnace.
7, mechanical transmission parts in accordance with the requirements of general equipment lubricating oil or oil change on a regular basis.
8, vacuum unit, valves, instruments and meters and other accessories, all press products are vacuum furnace maintenance with the specifications.
9, vacuum furnace maintenance should be a power outage maintenance, in the case of charged maintenance, must ensure that the operating personnel, maintenance personnel and equipment is absolutely safe.

2016年8月23日星期二

The electrical principle of intermediate frequency induction furnace

In molybdenum powder before choose coal furnace and electric resistance furnace drying more boring, with the skills and the advance of science and technology, foreign molybdenum powder choose sense of intermediate frequency furnace more boring.
The electrical principle of intermediate frequency induction furnace. Will three-phase medium frequency alternating current (ac) by 6 thyristor components of three-phase bridge type all control for a dc rectifier circuit, through the flat wave reactor, into a stable dc current source, then through single phase inverter bridge, make dc current inverter can surely frequency single-phase medium frequency current, supply induction coil, intermediate frequency furnace in order to counter the reactive power of the coil, at the two ends of the coil to counter capacitance in parallel, it constitutes the LC vibration circuit.

2016年8月18日星期四

The safe operating point of induction heating furnace

1, high frequency, intermediate frequency and power frequency induction heating operation, should pay special attention to prevent to get an electric shock. Before work, the operator should wear protective equipment of the insulation, the preparation of the floor should be laid rubber pad, and pay attention to prevent leaking cooling water spilled on the floor and other places.
2, equipment internal insulation must be good, reliable grounding, equipment should be installed protective fence around, after being closed high voltage switch, no one shall be within the scope of the dangerous activities. Preparation to bright light, install exhaust equipment, keep ventilated, indoor temperature control in 18-35 ℃.
3, before starting the equipment must be cooling water, the water pressure is 1.2 ~ 2 ATM ATM (1 = 0.1 MPa). Sensors in the load artifacts, all closed the door of the cabinet.
4, according to operation procedure, comply with the provisions of the filament preheating preheating time; When heated to maintain the current bias for screen flow (Yang) value of 15% one 20%, in order to make the oscillator output efficiency is highest; Circuit of the condenser cooling water outlet temperature should be below 35 ℃, the cooling system should be less than 55 ℃, stop working after about 10 ~ 15 min to stop water supply.
5, high-frequency equipment will produce radiofrequency radiation effect, after more than a certain amount, can produce adverse effect on the human body, the radiation source of reason to the equipment such as high frequency transformer, coupling capacitor and inductor shielding measures should be taken to prevent the high frequency electromagnetic leakage. Should guarantee the working environment of the radiation intensity control within the prescribed scope (electric field intensity E 20 v/m or less, magnetic field intensity H 5 a/m or less).
6, regular replacement of capacitor in the transformer oil, the longest do not exceed half a year, and check whether "band" in good contact.
7, the use of 200 ~ 300 h after to wash the oscillation tube anode with 10% hydrochloric acid solution on the scale, until clean (but not with a knife); Then rinse with warm water, and assembly.
8, the equipment should be kept clean, dry, of the anomalous phenomenon occurred shall be immediately cut off the power supply, check and troubleshoot rear can continue to work. High frequency equipment should be the specialist is responsible for the maintenance, the maintenance should be first discharge, then maintenance, to ensure personal safety.

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