What are the advantages of a vacuum induction furnace

What are the advantages of a vacuum induction furnace

First, let's take a look at the advantages of vacuum induction furnaces:
1, there is no air and vacuum induction furnace slag pollution, has certain environmental benefits, induction furnace smelting alloy is relatively pure, high performance level.
2, if the vacuum induction furnace smelting under the condition of vacuum, can go to gas to create a good environment, the content of such melting out of steel and alloy gas will be lower.
In a vacuum, the metal that is processed is not easily oxidized.
4, will be processed workpiece in smelting into some impurities, such as Pb, Bi, etc., and the impurities in the vacuum state can evaporate out part of this will make the material be purified.
When the vacuum induction furnace is smelting, it can use carbon to deoxidize, and the product of deoxygenation is the gas and the purity of the alloy is higher.
The vacuum induction furnace can accurately adjust and control its chemical composition, and can also use the return material.

Induction smelting technique is used in cast-iron production

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.

The process of vacuum induction smelting

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.

Cleaning of vacuum furnace

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.

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

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.

How many reasonable vacuum induction furnace quotation?

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.

Induction melting furnace in iron industry

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.

Medium frequency induction melting furnace work on what principle

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.

The structure characteristics of the vacuum furnace

      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.

The principle of induction melting furnace

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.