Vacuum Induction Melting Furnace: vacuum melting furnace

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2017年5月19日星期五

Induction smelting technique is used in cast-iron production

At present, most used in cast iron production, the most common induction melting furnace with power frequency induction furnace and intermediate frequency induction furnace, the characteristics of various induction melting furnace as shown in table
The composition of iron liquid is small. But power frequency induction furnace melting speed is slow, go against slagging, start to start block cold furnace, the production is not flexible, so the power frequency induction furnace is commonly used in heating and the remelting of the metal. In addition, the power factor of the working frequency induction furnace is low, and it is necessary to allocate a large amount of compensation capacitor to increase the production cost.
The intermediate frequency induction furnace is efficient and high thermal efficiency, short smelting time, easy to realize process automation and production flexibility. The medium frequency induction furnace is suitable for smelting cast iron, especially suitable for smelting vermicular cast iron, nodular cast iron and alloy cast iron. It is also more adaptable to the furnace material, and the variety and block degree of the burden can vary widely.
Although the advantages of medium frequency induction furnace is more, fast development, but the power frequency induction furnace in iron liquid storage, heat preservation, adjust the alloy composition and superheat temperature, etc., is still a good equipment, especially for blast furnace, cupola melting furnace duplex furnace is still widely used.
With the continuous development and application of induction melting furnace in industrial production, cast-iron production has entered a new stage. Although power frequency induction melting furnace some deficiencies, but it in metal heating and heat preservation, as well as the adjustment of iron liquid component has a unique advantage, especially as with other furnace duplex stove is still widely used. Medium frequency induction melting furnace for melting cast iron, vermicular cast iron, nodular cast iron and alloy cast iron are particularly, shows the superiority of, make its in recent years in the present widely used in the production of cast iron new trend.

2017年5月17日星期三

The process of vacuum induction smelting

Description: vacuum induction smelting is a method of smelting of eddy heating furnace in a metal conductor under vacuum condition
Vacuum induction melting is under the condition of vacuum, using electromagnetic induction heating furnace charge to produce eddy current in the metal conductor melting method, has the melting chamber volume is small, short time and vacuum smelting period, is advantageous for the temperature and pressure control, recycling volatile elements, accurate control of alloy composition, etc. As a result of above characteristic, has now for the development of special steel, precision alloy, electrothermal alloy, high temperature alloy and corrosion resistant alloy, and other special alloy production of one of the important working procedure.

2017年5月15日星期一

Cleaning of vacuum furnace

First you put the wash in the basket and push it inside, then tighten the door and tighten it. Use 30 minutes to heat the workpiece to 350 degrees and open the vacuum pump when the temperature reaches 340. It is important to observe whether the needle on the thermometer is gradually rising, and if there is no increase or speed, you need to check for leaks.
The temperature in the furnace is kept at 350 degrees for 90 to 120 minutes, and more than 80 percent of the experimental high polymer melt into the waste collection tank, which is cooled and then processed. The period can be increased or reduced according to the content of the high polymer. Then heat the oven to 480 degrees in 30 minutes.
In the furnace temperature of 500 degrees heat preservation after at least six hours, make the rest of the small amounts of polymer under the conditions of high temperature, vacuum, low oxygen, oxidative decomposition, this is the main stage can wash clean. During this time, the high polymer in the furnace will be decomposed into carbon dioxide and water. At this time, through the suction of the water ring vacuum pump, the carbon dioxide and water vapour generated in the furnace are processed by the water spray scrubber. As long as there is enough time, there will be no organic matter to be cleaned, and the process will be set at 7.5 or 8 hours, when the high polymer above is more.
Fourth steps to run after the procedure at the end of the whole, this furnace immediately with water and electricity meter electricity, only enter a state of natural cooling, without human intervention.

2017年4月27日星期四

The three main advantages of the high temperature vacuum furnace are detailed

The high temperature vacuum furnace can reach two thousand degrees, it is a kind of equipment that is heated in a vacuum, and today it is the mystery of the high temperature vacuum furnace.High temperature vacuum furnace in the furnace chamber within a particular space using the vacuum system, by the vacuum pump, vacuum measuring device and vacuum valve components such as carefully, substances out of furnace cavity part, making furnace chamber pressure is less than a standard atmospheric pressure, so as to realize a vacuum furnace cavity space, that is the vacuum furnace.An industrial furnace, an experimental furnace, heated by an electric heating element near a vacuum.In a metal casing or quartz glass, the furnace is connected to a high vacuum pump system.The vacuum in the furnace is 133 times (10-2 ~ 10-4) Pa.The heating system can be heated directly by silicon carbide or silicon molybdenum rod, and can be heated by high-frequency induction.It is mainly used for ceramic burn, vacuum smelting, electric vacuum parts besides gas, annealing, metal parts brazing, and ceramic, metal sealing etc.
It is possible to remove oxidation and decarburization of the surface of the workpiece during hot process, and obtain the clean surface of the non-metamorphic layer.That only when grinding mill side of the cutting tool, such as twist drill grinding after make the groove on the surface of the decarburization layer directly exposed to the blade, the cutting performance of improved relations.
No pollution of the environment, no three waste disposal.
The measurement of furnace temperature and the accuracy of monitoring are obviously improved.Indicated value of thermocouple temperature and furnace temperature reached plus or minus 1.5 ° c.But in different parts of a large number of artifacts in the furnace temperature difference is bigger, if USES the rarefied gas forced circulation, can still be controlled within + / - 5 ° c temperature difference.

2017年4月6日星期四

How many reasonable vacuum induction furnace quotation?

Vacuum induction furnace belongs to a kind of vacuum furnace, mainly by the effect of electromagnetic induction, creates an electric current in metal furnace charge itself, and then rely on the resistance of the metal charge itself, according to the joule - lenz's law, the electric energy into heat energy, thus melting metal. Because the vacuum induction furnace without pollution, environmental benefits is better, therefore, it is very popular with the consumers in the market. When consumer is buying the vacuum induction furnace, besides will focus on the quality of the products, for the product price is also very the attention of the market price of vacuum induction furnace above? Vacuum induction furnace reasonable price?
Now, vacuum induction furnace above the market price is very chaotic, there are some bad suppliers use inferior materials product, thereby reducing the product cost, thereby lowering the price of vacuum induction furnace, as a result, some consumers will choose cheaper products, thus caused the chaos on the market of vacuum induction furnace, the product quality is uneven, the price of the good and bad are intermingled. The market the vacuum induction furnace above the price is reasonable? How much is the vacuum induction furnace?
Actually, because the quality of the vacuum induction furnace and cost issues, in general, the vacuum induction furnace quotation above market should in 4-100000 yuan or so, but there is some price is thousands or even hundreds of, these products are advised consumers to choose carefully, because the quality of these products may have some defects, and, of course, can also be second-hand products, so consumers need to consider carefully.

2017年2月7日星期二

Induction melting furnace in iron industry

In the iron industry, the two most commonly used to induction melting furnace were power frequency induction furnace and intermediate frequency induction melting furnace.
First for medium frequency induction melting furnace, its strong adaptability, the variety of burden or piece of degree is not very strict, so widely used in melting cast iron, its melting alloy cast iron, nodular cast iron and so on need induction smelting products are widely used in manufacturing.
Power frequency induction furnace melting slag is relatively slow, some are not suitable for slagging, production lack of flexibility, cold start need to start, but at the same time it makes heating and metal melting, uniform heating temperature, burning loss is small, can facilitate the regulation of iron liquid ingredients, small relatively dirty. So usually suitable for metals and alloys remelting and heating up.

2017年1月16日星期一

Medium frequency induction melting furnace work on what principle

How medium frequency induction melting furnace works, what is the principle of intermediate frequency induction melting furnace, the following is to introduce: medium frequency induction 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, 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. , 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.

2017年1月9日星期一

The structure characteristics of the vacuum 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.

2017年1月3日星期二

The principle of induction melting furnace

Using SCR ac induction melting furnace control system, digital dc power conversion theory of relay control, high reliability and high working frequency interference, automatic tracking, workflow function without manual intervention, automatic matching load and power supply. Due to the over current, over voltage, lack of phase, water pressure protection, allowing any failure equipment operation will not damage components, reduce the use and maintenance of the equipment.
Heat penetration, melting, brazing, such as the support used single crystal, heat treatment and sintering,. Feedback system can increase the temperature, the temperature of the closed loop automatic control system: increase the attached machine separation temperature, in order to achieve just send fake eligible workpiece temperature, in addition, the special interface of PLC or accept "interface", industrial control and heating system, realizes the intelligent control and intelligent temperature precise execution of smelting temperature control instrument control coupling.

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.

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