The application of vacuum induction furnace in the mold industry

The application of vacuum induction furnace in the mold industry

Vacuum heat treatment technology in the early stage of development in China in the 70 s, people mainly study the basic properties of vacuum heat treatment, the heating characteristics of metal evaporation problems and the basic rule of metal heating process under vacuum and deformation problem, at the same time to carry out the research of the typical heat treatment process, the vacuum oil quenching and vacuum gas quenching process, is used to study corresponding to laid the foundation for the further research and application of vacuum heat treatment technology.
Since the 80 s, vacuum heat treatment technologies are rapidly developing in our country, the introduction of advanced equipment, vacuum heat treatment (pit type furnace heat treatment of workpiece hardness testing method) technology application is becoming more and more widely.
High pressure gas quenching process, vacuum carburizing technology, vacuum sintering, vacuum brazing, vacuum ion carburizing (n, metal) technology research and application of started, vacuum heat treatment technology start from studies and a small amount of production to industrial production field.
With the progress of technology, entering the 90 s, vacuum heat treatment technology appeared a lot of new technology and new characteristics of high pressure gas quenching and application of high pressure gas quenching vacuum heating and rapid cooling technology, hot air circulation tempering vacuum cleaning technology, vacuum heat treatment equipment and process of intelligent control system, the vacuum nitriding technology, vacuum ion carburizing technology to flourish, such as in the United States, Germany, France, Japan, Britain and other countries is becoming a hot spot of new technology development. Tracking the international advanced technology in this field in our country, combined with national conditions, and actively research and development of our country's new technology wood equipment of vacuum heat treatment, such as high pressure gas quenching process, vacuum tempering hot air circulation fast cooling technology, continuous vacuum heat treatment process and vacuum carburizing, vacuum nitriding process, etc. In vacuum cleaning technology, vacuum heat treatment process and high temperature heat treatment fields such as intelligent control system is to research the exploration and development of industrial application test, the development of the vacuum heat treatment process at the end of the hing, bright prospects.

The degassing principle of vacuum induction furnace

  The degassing principle of vacuum induction furnace

  Degassing is material of slow evaporation in vacuum phenomenon, is the main problem on the vacuum performance. Any of the surface of the solid material is likely to be attached to gas and liquid accumulation form molecular layer. As a result of the pressure will gradually reduce the molecular layer gradually evaporate, because the surface energy is smaller than the vacuum energy.
  Nitrogen, and volatile solvent degassing speed faster, with an inert gas and oil and water vapor will continue to adhere to the surface, after a few hours will evaporate. Porous materials, dust particles can increase the surface area and other natural substances, so may cause more degassing. Radiation and temperature will provide enough energy to absorb molecules from the surface. Vacuum induction furnace temperature can release after low temperature when attached on the surface molecules. So, with the increase of furnace temperature, degassing phenomenon will gradually increase.

The operation principle of intermediate frequency induction furnace

The operation 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 operation principle of medium frequency induction furnace is boring. Application by medium frequency induction furnace boring first is Faraday electromagnetic induction principle representation, namely alternating current will attack induced current in the conductor, and then the conductor between the appearance of the onset of fever, induction heating is a good form of electric heating, one of the electrical energy into heat energy, the three-phase power supply by medium frequency induction power supply into intermediate frequency alternating current, when the alternating current turned round induction coil, it will attack alternating magnetic field sensor, that is to say, will attack range and direction are alternating magnetic flux Φ changes over time.

When the conductive metal tube is placed within the induction coil, according to Faraday's law of electromagnetic induction, metal tube inside will attack the corresponding е induction electromotive force, because the metal is a conductor, intermediate frequency furnace would be due to the existence of the induced electromotive force induced current I2, the induced current I2 is called eddy current, and on the basis of joule - lenz's law, the eddy current in metal pipe with resistance must be internal flow at will attack will surely heat Q, and then make the metal is heated.

Medium frequency induction furnace in the production of electricity saving way

Medium frequency induction furnace in the production of electricity saving way

 

Medium frequency induction furnace because of its advantages of less investment, quick effect, convenient operation, widely used. Induction furnace production energy saving problem has been attracting the attention of the manufacturer. In this paper, according to the characteristic of induction furnace and my many years of experience in production practice. From improving production efficiency, improve the melting speed, reduce the melting time. Induction furnace production of intermediate frequency furnace energy-saving approaches are discussed.
1 prolong continuous smelting Power consumption has a lot to do with smelting method, the furnace works can be divided into three conditions:
1) continuous smelting: daily class three continuous operation;
2) intermittent smelting: daily two class or class assignments, the assignments during the furnace hot metal with thermal insulation power;
3) intermittent smelting: after the completion of all the daily net. Obviously when the above three conditions, continuous smelting electric energy consumption minimum, intermittent smelting times, intermittent smelting the highest. Therefore, conditional your case should be as much as possible into a continuous smelting. Try to increase a smelting furnace, extend the duration of smelting, lower power consumption.

Induction heating equipment advantages

Induction heating equipment advantages

 Induction heating furnace is a kind of will power frequency 50 hz alternating current into intermediate frequency (above 300 hz - 300 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.
  Due to the principle of electromagnetic induction medium frequency induction heating, the heat inside the workpiece itself, ordinary workers with intermediate frequency electric furnace to work after ten minutes for the task of forging work continuously, without burning furnace professional workers for burning furnace and furnace work ahead of time.
  Due to the heating mode heat up fast, so few oxidation, medium frequency heating forging of oxidation burning loss is only 0.5%, gas stove heating oxidation burning loss of 2%, coal-fired furnace reached 3%, intermediate frequency heating process saving material, every tons of forgings and burn coal stove compared to save steel raw materials for at least 20 to 50 kilos. Medium frequency induction heating furnace heating speed, medium frequency furnace production efficiency is high, the intermediate frequency furnace oxidation decarburization, intermediate frequency furnace to extend the die life, less of intermediate frequency furnace working environment is superior, intermediate frequency furnace to improve Labour standards and the company's image, intermediate frequency furnace pollution-free, low-power intermediate frequency furnace and medium frequency furnace melting speed, medium frequency furnace energy-saving effect is good, intermediate frequency furnace burning less, low energy consumption and the uniform mixing function, melting temperature and metal composition, intermediate frequency electric furnace heating start-up performance is good, good working environment, intermediate frequency furnace air furnace, furnace can be 100% full.

Induction furnace coreless induction melting furnace

Induction furnace coreless induction melting furnace

Coreless furnace named is relative intentional furnace, the metal liquid in a crucible, therefore, also known as the crucible furnace. This type furnace is mainly used in special steel, cast iron, non-ferrous metal and its alloy melting and heat preservation. Coreless furnace has a high melting temperature, less impurity contamination, alloy composition uniformity, good working conditions and many other advantages. Compared with intentional furnace coreless furnace furnace and a change in metal varieties are more likely to use more flexible, but its power, is far less than intentional furnace thermal efficiency. Coreless furnace because of the low surface temperature, slag formation of high temperature melting.
Coreless furnace with high frequency, intermediate frequency and power frequency.
(1) high frequency coreless furnace
High frequency coreless furnace capacity generally under 50 kg, suitable for laboratory and small scale production for smelting special steel and special alloy.
(2) the medium frequency coreless furnace
The capacity and power of the medium frequency coreless furnace are bigger than high frequency furnace. Mainly used in special steel, such as magnetic alloy and copper alloy melting. The furnace due to the need for expensive frequency conversion equipment, so in some large capacity situation has changed labor frequency coreless furnace. However, compared with power frequency furnace, intermediate frequency furnace also has its unique feature. As for the same capacity of the furnace, intermediate frequency furnace input power is greater than power frequency furnace, so the melting speed is faster, intermediate frequency furnace in cold furnace melting block, do not need a furnace on liquid metal can be poured out, so than when using flexible power frequency furnace; In addition, medium frequency melting furnace crucible lighter scouring solution, good for lining. Therefore, in the development of the high power of intermediate frequency power supply cheap, intermediate frequency furnace is promising.

Induction furnace smelting technology

Induction furnace smelting technology

The first intermediate frequency induction furnace were completed and put into operation in our country, has been 69 years of history. Since 69, the special steel industry in China under the joint efforts of several generations was a great development, and promote the development of steelmaking process and technology. Special smelting has become an important part of the special steel production in China, induction furnace smelting is its main branches.
The development of special steel, special alloy varieties, to promote the progress of metallurgical technology. Metallurgical technology is in solving the metal materials in the development of technical challenges, just got rapid progress. For example: the invention of the ultra-low carbon stainless steel, promoted the argon oxygen decarburization (AOD) stainless steel smelting and vacuum oxygen decarbonization (VOD) technology development; The emergence of high temperature alloy complex alloying technology and promoting the vacuum induction furnace, vacuum arc remelting, etc. The development of the technology. A lot of the fact that the metallurgy and metal materials disciplines have close interdependence between, the relationship between interrelated, mutual penetration.

Electric capacitor failure analysis of medium frequency induction furnace

Electric capacitor failure analysis of medium frequency induction furnace

1. Induction furnace the capacitance internal spark: the machine is running, there was a noise inside, is the insulation breakdown, should follow change new one.
2. The capacitance external lighter: the machine is running, the external flint, capacitor shell is not good for ground insulation series or parallel booster series capacitors are connected to the parallel capacitor shell.
3. The cooling water can result in heat insulation damage, should be timely treatment. The insulation of the electric capacitor check the insulation resistance of the condenser is divided into the poles, the multistage electrical insulation between the group and the poles of the insulation resistance of the shell due to its capacitance is composed of capacitor in series, in parallel components, the insulation of the individual components degradation will not reduce insulation resistance of the capacitor, so remote sensing electrode insulation resistance may be difficult to find defects. So don't usually do this test, and only do the poles or multistage insulation resistance measurement of the shell. According to the rated voltage with different number of shaking table. Now rated voltage 750 v, for example, use 1000 v shake table, should be taken before shake side will capacitor discharge. Roll side, should first will shake table to the specified speed, after waiting for its smooth pointer, the poles of the shaking table pick to capacitor, continue to turn shake table. Beginning, because of capacitor charging, pointer will decline, then slowly rises until stable, at this time of reading very capacitor electrode resistance, usually 1000 v is not less than 1 megohm. Read number again later, should first will shake table line, is to stop shaking. Otherwise, easy to burn out because of the capacitor discharge header. After telemetering, capacitor discharge, should be to avoid electric shock.

Vacuum induction melting furnace structure Introduction

Vacuum induction melting furnace structure Introduction

Melting furnace structure, introduction of a complete set of melting furnace furnace equipment consists of intermediate frequency power supply cabinet, compensation capacitance, furnace (two) and water-cooling cable, reducer. Shell, induction coil, furnace lining, furnace body by tilting furnace reducer of four parts, such as furnace shell made of non-magnetic materials, induction coil is made up of rectangular hollow tube spiral shell, melting when the cooling water pipe. Coil which leads to the copper platoon and water-cooling cable connected, induction coil, furnace lining close to, composed of quartz sand play solid sintering, tilting furnace by tilting furnace reducer rotate directly. Tilting furnace is a secondary turbine speed reducer, self-locking performance is good, stable and reliable, emergency power when the tilting furnace work, to avoid danger. Can choose furnace switch of two furnace tilting furnace reducer motor control options, with four core rubber-sheathed wire switch box enables the operator to stand in the right position of the furnace body tilting, inching control reset.
Is generally more than 3 tons of melting furnace has not adopt the institutions, tilting vacuum furnace is given priority to with the hydraulic oil cylinder, induction copper outer circle several uniform imitation arc magnetic yoke, prevent leakage. Using this method, the furnace shell does not need to use nonmagnetic materials, furnace shell outside is not hot. Using hydraulic tilting furnace equipment gently tilting furnace process, safety.