Principle of intermediate frequency furnace by what job

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.

A common use of vacuum furnace

            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.

Resistance furnace and Intermediate frequency furnace for melting aluminum

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.

Several advantages of medium frequency furnace steelmaking

Several advantages of medium frequency furnace steelmaking

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.

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

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.

Vacuum induction furnace smelting principle and characteristics

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.

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

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.

Medium frequency melting furnace latest works

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.

Medium frequency melting furnace outstanding characteristic

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.