Medium frequency induction furnace

Medium frequency induction furnace

Vacuum brazing furnace, medium frequency induction furnace medium frequency induction furnace used for power supply in 150 - a - 10000 hz frequency range of induction furnace as medium frequency induction furnace, the main in 150 - a - 2500 hz frequency range. Domestic small frequency power frequency induction furnace for 150, 1000 and 2500 Hertz.
Medium frequency induction furnace is a kind of applicable to the smelting of high quality steel and alloy smelting equipment, and work well in induction furnace has the following advantages:
1) the melting speed, high production efficiency. Medium frequency induction furnace power density is big, the power of each tonne of steel liquid configuration than about 20 a 30% larger power frequency induction furnace. Therefore, in the same conditions of medium frequency induction furnace melting speed, high production efficiency.
2) strong adaptability, flexible use. Each in medium frequency induction furnace molten steel can all net, replace the steel grade is convenient; Per furnace and power frequency induction furnace molten steel does not allow the net, you must retain part of the liquid steel for the start of furnace, thus replacing steel grade is not convenient, only applies to single varieties of steel smelting.
3) electromagnetic stirring effect is better. As a result of the liquid steel under electromagnetic force is with power frequency is inversely proportional to the square root, so stirring force of intermediate frequency power supply is smaller than power frequency power supply. For removing impurities in steel and homogeneous chemical composition, uniform temperature, stirring effect of intermediate frequency power supply is better. Power frequency power supply big stir force make molten steel on the lining of scouring force increases, not only reduce the refining effect and can dramatically reduce the useful service life of crucible.
4) starting operation is convenient. Due to the skin effect of medium frequency current greater than the power frequency current, so the intermediate frequency induction furnace at the start, no special requirements to burden, after loading can rapid heating temperature; While power frequency induction furnace for specialized production of furnace charge block (and the approximate size of crucible, about in the cast steel or cast iron piece of crucible half height) to start the heating, and heating up slowly. Read this, under the condition of cycle operation mostly use medium frequency induction furnace. Start convenient bring another advantage is that can save electricity when cycle operation.

What is the intermediate frequency furnace?

What is the intermediate frequency furnace?

Intermediate frequency furnace using 200-2500 hz frequency induction heating power supply, heat insulation, it is mainly used for smelting carbon steel, alloy steel, special steel, also can be used for copper, aluminum and other non-ferrous metal smelting and the temperature. Equipment is small in size, light weight, high efficiency, less consumption, melting heat up quickly, easy to control furnace temperature, high production efficiency.
Medium frequency induction furnace hot water works
Using medium frequency furnace power supply mode is different from the power frequency electric boiler, is a 380 v power frequency ac power input of intermediate frequency power supply cabinet (intermediate frequency power supply is contained in the over-voltage protection, over-current protection, such as over voltage, over current phenomenon will automatically stop alarm), in the medium frequency power supply will be contained in the power frequency ac power rectifier for single phase dc, again through the inverter single-phase ac frequency voltage, electric current (single-phase ac frequency voltage and current are safe), the single-phase ac frequency voltage and current input induction heater produced for induction heating of the water in the boiler. This boiler heating process cwe separation, safe and reliable.

Good vacuum induction furnace protection maintenance methods

Good vacuum induction furnace protection maintenance methods:

1) the pump protection maintenance, please see the detail its use manual;
2) vacuum induction furnace, when not in use for a long time, it is necessary to properly keep system with cooling water should be put on net. Especially in the winter should adhere to the indoor temperature above 10 ℃, smooth with antifreeze bad equipment and adhere to the outstanding conditions;
3) work to introduce choose 46 anti-wear hydraulic oil, oil using oil temperature within 15 ℃, 60 ℃;
4) the oil should be consented to enter the tank after strict filtering;
5) oil each replaced once a year, for the first time in the replace time shall not exceed three months;
6) check check once every six months pressure gauge,
7) the machine is stopped for a long time, the processing appearance should be wiped clean and coated with anti-rust oil.
8) don't know the structure of the machine function or procedure should not private line to start the machine;
9) machine in the process of operation, should not be for maintenance and adjustment mould;
10) when machine found serious leak or other abnormal (such as the action is not reliable, large noise, vibration, etc.) should be parking analysis reason, try to wipe out, not being put into production.
11) shall not be overloaded or beyond the maximum offset distance use;
12) long-term need not when vacuum induction furnace, vacuum box should be insured deposit under the vacuum condition, all equipment cooling water should be put on net. Especially in the winter should adhere to the indoor temperature above 10 ℃, smooth with antifreeze bad equipment and adhere to the outstanding conditions;
13) before beginning each technical process, should be measured a heater resistance and insulation resistance to ground, ensure no short circuit, open circuit representation;
14) regularly check system all wiring is loose or break line, such as found that should tighten loose place, will break from cohesion;
15) heating chamber, such as attack damage need to replace, otherwise the heat preservation effect;
16) to check the electric control cabinet back each relay is instrumentation, such as loose surface are detected, should be timely put tight;
17) time to arrange, electric control cabinet to remove adherent dust, crushed, metal scraps, etc., don't make it work for a long time in high temperature, moisture, dust pollution environment;
18) claims that did not work, please send electric control cabinet back all the status of the circuit breaker from ON to OFF, or directly closed the total power, avoid shock disturbance;
19) using the touch screen, pay attention to the operation process, avoid the wrong operation; Touch screen together to gently, avoiding the damage to the screen.

Prospects of the development of vacuum induction furnace

Prospects of the development of vacuum induction furnace

Vacuum induction furnace oxidation, decarbonization, surface brightness, small deformation, no pollution, energy saving, high degree of automation, as well as the advantages of wide scope of application, in recent years is one of the faster growing new technology of heat treatment, especially in the case of aviation materials surface modification gain great progress. Many of the new development of advanced heat treatment technology, such as vacuum high-pressure gas quenching, vacuum chemical heat treatment, etc., also need to implement at the bottom of the vacuum. The vacuum heat treatment technology can make the structure material, working mould quality and greatly improve the service life, especially suitable for some precision parts heat treatment.
With the development of the vacuum heat treatment technology, vacuum heat treatment equipment such as vacuum tempering furnace, vacuum heat treatment furnace, vacuum annealing furnace, vacuum carburizing furnace, vacuum sintering furnace, vacuum brazing furnace was successfully developed at home, such as vacuum furnace in industrial manufacturing technology and equipment level enhances unceasingly, vacuum degree has reached the international level, but in automation control and device on the precision processing of, there is still a gap with foreign, especially in ultrahigh vacuum furnace on the stability of performance remains to be the improvement of precision devices. In addition test technology and the development of measuring instruments also has a great influence of vacuum equipment, especially the automatic test and control technology. Limiting vacuum of vacuum equipment, vacuum degree of work, empty furnace fit time, pressure rise rate, furnace temperature uniformity and empty furnace heating time parameters such as accurate measurement, and performance is the main embodiment of vacuum furnace performance.
In the industrial developed countries, the proportion of the vacuum heat treatment furnace has reached about 20%, and about 1200 sets of vacuum heat treatment furnace in our country at present, about 1% of the total number of heat treatment furnace, and a big gap in foreign countries, is expected in the future, as the heat treatment industry technology progress and requirement for the quality of heat treatment of workpiece is higher and higher, the development of the vacuum heat treatment will be larger.

What is the working principle of high frequency induction melting furnace?

What is the working principle of high frequency induction melting furnace?

High frequency induction melting furnace main working principle: the high frequency of high frequency large current flows to be made around the circular or other shape of the heating coil (usually with copper control). Thus produce polarity in the coil and the instant change of strong magnetic bundle, such as the metal is heated objects placed in a coil, a magnetic beam will through the whole heated objects, in the interior of the heated object and heating current in the opposite direction, will produce relatively large eddy current. There is resistance because of the heated object, it will produce a lot of joule heat, the temperature of the object itself rapidly rising. To achieve the purpose of to all metal material heat.

The overall structure of vacuum furnace

The overall structure of vacuum furnace

Vacuum tempering furnaceThe body consists of two parts; The upper part of the vacuum chamber (negative pressure steam room), hold the space tubular steam-water heat exchangers, used to heat flow through the circulating water heat exchanger. Operating principle: the vacuum hot water boiler is running, under vacuum negative pressure furnace absorbed heat medium water inside the fuel combustion heat release, boiling vaporization for low temperature steam, low temperature steam rising in stainless steel heat exchanger in circulating water system, circulating water heating for the user or sanitary hot water for heating.
Itself is cooled water vapor condenses into water droplets fall to the heat medium water again after heated, so as to complete the whole cycle. So it is the working principle of the interior of the vacuum furnace. HTM constantly in an enclosed body = = = = evaporation condensation = = "boiling heat medium water" in the loop, so don't need to supplement the condensed water, also do not have empty the risk of burning. Vacuum hot water boiler using soda condensation heat transfer, in all working condition of heat transfer, soda, condensation heat transfer coefficient of heat transfer is the highest.

Vacuum Induction Melting

 

Vacuum Induction Melting

 Vacuum induction melting (VIM) utilizes electric currents to melt metal within a vacuum. The first prototype was developed in 1920.One of the only ways to induce a current within a conductor is through electromagnetic induction. Electromagnetic induction induces eddy currents within conductors by changing the magnetic field. Eddy currents create heating effects to melt the metal. Vacuum induction melting has been used in both the aerospace and nuclear industries.
History
E.F. Northrup built the first prototype of a vacuum induction furnace in 1920 in the United States of America. In 1923, German scientist Wilhelm Rohn continued to advance the VIM technology along with founding the Heraeus melting facility. Medium frequency furnaces were seen soon afterwards in England and Sweden in 1927.The process was initially developed to refine certain special metals such as cobalt and nickel. As these metals and alloys became more common, the process of VIM became more widely used. VIM now helps to melt a variety of metals for aircraft and nuclear applications.
Procedure
Vacuum induction melting uses currents within a vacuum to melt metal. VIM involves placing a core-less induction furnace into a vacuum chamber.The heat used to start the melting process comes from an induced current called an eddy current. The melting and casting operations are then carried out at low pressures to control the entire alloy chemistry process.
Uses
VIM was usually used for refining high purity metal and alloys. VIM is now becoming more popular due to the variety of uses now available. The commercial production of nickel titanium alloys utilizes VIM to its full extent. Other examples of using VIM include melting steels for nuclear applications, cobalt alloy for medical applications, and both high purity copper alloy and clean magnetic alloy for high permeability.The process of VIM can even begin electro-slag remelting, which can remelt electrodes.
Nickel titanium
VIM is the most widely used process for the production of nickel titanium alloys. When producing nickel titanium, the process of VIM using a hot graphite crucible sometimes causes carbon contamination which causes some of the titanium ions to form titanium carbide (TiC). These TiC particles change the transformation temperature along with the strength of the alloy. This is one drawback with the process of vacuum induction melting in graphite.

The working principle of vacuum furnace

         The working principle of vacuum furnace

  Vacuum boiler is in a closed furnace internal form a negative pressure of vacuum, filling heat medium water in the body. By burning heating heat medium water or any other way, again by heat medium water evaporation, condensation and heat exchanger, again by heat exchanger to heat to heat water.
Vacuum boiler heat conversion signal:
Oil, natural gas, gas, electricity - > combustion heat (electric conversion) - > heat medium water - > after boiling steam condensation heat transfer of -- -- -- -- > > heat exchanger heat transfer > water
 Vacuum boiler working principle: using the characteristics of low water under the condition of low boiling point, rapid heating sealing furnace heat medium filled in water, high temperature steam, the heat medium water boiling evaporating out water vapor condenses on the heat exchange tube heat exchange tube in cold water, hot water supply.
Standard sea level atmospheric pressure: 1.013 x 105 pa = 101.3 KPa, the water's boiling point is 100 ℃; The higher the altitude, the lower atmospheric pressure, the boiling point is reduced:
The Tibetan plateau: the average altitude of 4000 m, atmospheric pressure of 62 kpa, at this time the boiling point of water is 87 ℃;
Mount Everest: up to 8848 m, 33 kpa atmospheric pressure, the boiling point is 71 ℃;
 Vacuum boiler by pumping air into vacuum state, almost no air to form a low pressure environment, and then use water (less than atmospheric pressure) under low pressure low temperature steam boiling, soda condensation heat transfer way will work the principle of heat output.
 Vacuum heat medium boiler water is after deoxidization, descaling and other special processing of high pure water, a filling to complete before they go out, when used within the unit closed cycle (vaporization and condensation and evaporation), does not increase, not decrease, in unit service life does not need to supplement or replace.
 Therefore, the vacuum inside the boiler furnace will never scale, corrosion, normal service life can reach more than 20 years, far more than ordinary hot water boiler the service life of 10 years or so.