Vacuum melting furnace: Vacuum Induction Melting

显示标签为“Vacuum Induction Melting”的博文。显示所有博文

2017年4月6日星期四

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.

2016年12月30日星期五

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.

2016年11月16日星期三

Vacuum induction furnace processing technology

Vacuum furnace according to the structure can be divided into vertical and horizontal two series, the series is divided into vertical bell lift and lift the bottom tray. Horizontal series of single structure and front and rear double open the door to open the door again two kinds of structure. Furnace adopt water-cooled wall structures.
Heating equipment to protect the greenhouse adopts full metal type and compound two to choose from, all metal type of heat-resisting stainless steel and molybdenum screen; Compound of heat-resisting stainless steel, molybdenum screen and carbon felt, mullite fiber or silicate fiber composition. The specific choice depends on the user's process conditions and the requirement of process environment.
Heater is nichrome wire (belt), molybdenum wire (belt, bar), several types such as graphite, specific choice depends on the user's maximum temperature. Heater distribution have heating type and all-round heating two all around, to ensure that the user requirements for uniform temperature in the vacuum furnace type.
Cooling system has roots blower external loop structure, centrifugal fan centrifugal fan outside loop structure, cold wall circulate in several types such as the structure, meet the requirements of different cooling speed.
Vacuum system with pump + + mechanical pump, turbomolecular pump, turbomolecular pump, mechanical pump, diffusion pump, roots pump and mechanical pump, roots pump + mechanical pump, low temperature condensate pump + several types such as mechanical pump, according to the ultimate vacuum index selection.
Imported intelligent temperature controller, temperature control can realize the automatic control of heating, constant temperature, cooling function; With process curve storage function, can store several different process curve; Have litre cooling speed is adjustable and accurate clock function, can also according to the actual temperature and set temperature and other parameters; A vacuum furnace operation and power-fail protection function. Has a perfect alarm and protection.

2016年11月10日星期四

Intermediate frequency electric furnace safety operation procedures

1, check things out before blowing in electrical equipment, water cooling system, sensor brass etc are in good condition, otherwise prohibited furnace.
2, furnace melting in excess of the prescribed shall promptly repair. It is strictly prohibited in melting too deep inside the crucible for melting.
3, sending and furnace should have someone who's in charge, after sending it is forbidden to contact sensors and cables. On duty shall not leave post, pay attention to the sensor and external circumstance of crucible.
4, loading, should check harmful items such as burden in presence of flammable and explosive mixed with, if you have to remove timely, it is forbidden to cold and wet material directly add to the liquid steel, melted liquid filled with first division after it is forbidden to chunk is expected to join in case cover.
5, and tamped crucible, scrap iron, iron oxide are forbidden to mix, rammed crucible must be compact.
6, pouring fields and official pit furnace should have no obstacle, no water, in case the steel landing explode.
7, molten steel are not allowed to dress too full, hand carry bags when pouring, two of them should be conformed to walk should be smooth, not allowed to walk fast abrupt stop, after pouring yu gang in a designated place, it is forbidden to dump.
8, intermediate frequency generator room should be kept clean, it is strictly prohibited flammable and explosive goods and other debris into indoor, indoor smoking ban.

2016年10月31日星期一

Environmental characteristics of medium frequency heating equipment

Medium frequency heating furnace is a kind of will power frequency 50 hz alternating current into intermediate frequency 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 the capacitor and inductor in the flow of 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.
Professional build medium frequency heating furnace/frequency diathermy equipment series of characteristics of heating furnace, heating speed, high production efficiency, less oxidation decarburization, save material and cost, extend the life of the mold.
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. The material utilization rate can reach 95%. Table due to the heating way heating uniformity, core temperature difference, so in terms of forging also greatly increase the service life of forging die, forging surface roughness is less than 50 um technology of energy saving, energy-saving 31.5% ~ 54.3%, the proportion of medium frequency heating oil heating than gas heating energy saving 5% ~ 40%. Heating quality is good, can reduce the rejection rate of 1.5%, increasing production rate of 10% ~ 10%, 10% ~ 15% extend the die life.

2016年9月26日星期一

The advantages of medium frequency melting furnace gathers numerous

Medium frequency melting furnace is a new type of heating equipment, made a huge contribution to iron ore industry, it is a lot of advantages in one of the product, so it was very popular. It is in use process plays a what advantage?
First, installation and operation is very convenient, which is quick to learn;
Second, intermediate frequency magnetic field of molten metal magnetic stirring effect, are beneficial to homogeneous and scum
Third, 24 hour uninterrupted smelting capacity;
Fourth, convenient change different weight, different materials, different ways of the furnace body, to adapt to all kinds of melting requirements; Vertical furnace, manual melting furnace, electric furnace, and the school laboratory furnace, portable high frequency melting furnace.
Fifth, save electricity saving energy; Power using IGBT power components, imports more integrated miniaturization, effective power output reached more than 90%.
Sixth, adopt the subminiature medium frequency induction heating power supply, 60% energy saving than the traditional SCR intermediate frequency!
Seventh, good diathermancy, heating temperature uniformity
Eighth, super small volume, light weight, portable, covers an area of less than 1 square meters
Ninth, according to the recommended equipment and maximum amount of smelting, each furnace smelting time for 20 to 30 minutes
Our company specializing in the production of intermediate frequency furnace and medium frequency furnace and other heating equipment, can provide customers with the best quality products, to meet the different needs of customers. We do professional, advanced and reliable. The rationality of the design of precise calculation, let each components can reasonable use, reduce loss, save electricity.

2016年9月19日星期一

Vacuum furnace maintenance technology

Because the types and forms of vacuum heat treatment to protect a lot, so the maintenance and overhaul project each are not identical. Maintenance check content should be based on the stove technology file and can be divided into every furnace according to the actual needs, daily, monthly, every half a year and every year for the project. The following eight o 'clock every furnace are summarized, the daily repair and maintenance projects.
1. To have spirit town function of the air pump, should be in the daily check and according to the need to be open before blowing in 30 min, to eliminate the moisture in oil pump.
2. Regularly check the cooling water, compressed air, hydraulic system pressure and the flow of cooling water.
3. The oven door rubber seals and flange surface should be checked before care door, can't have sand and sundry, with thousands of net stretched cloth to wipe the rubber sealing ring and the flange surface, then evenly coated with vacuum grease rear can close the oven door.
4. The workpiece must be cleaned before charging. After oil quenching treatment should be soaked in oil of oil in the material box, carrying parts all clean.
5. The air-filled motor is generally used in vacuum can not start must be inflated to start and electric interlock protection device to protect.
6. Roots pump should be in above of 133 pa vacuum can start, also should have electric interlock protection device to protect.
7. To have compressed air piping, open the drain valve should be released water every day.
8. Often pay attention to the cooling water in and out of the water temperature indicator is normal, check the touch electrode joint, oven door, whether there are local in areas such as the transformer cooling water pipe temperature anomalies.

2016年9月9日星期五

The structure of the vacuum induction furnace

Induction vacuum furnace in the furnace chamber within a particular space using a vacuum system (by the vacuum pump, vacuum measuring equipment, vacuum valves and other components is assembled by meticulously) will be some material discharge furnace chamber, the furnace chamber pressure is less than a standard atmospheric pressure, and complete vacuum furnace cavity space, which is a vacuum furnace.
Vacuum induction furnace usually by host, furnace, electric equipment, sealing furnace shell, vacuum system, power supply system, temperature control system and truck outside the furnace, etc. Sealing furnace shell made of carbon steel or stainless steel welding is removable parts of joint face seal with vacuum sealing material. To avoid heated furnace shell deformation and metamorphism sealing material is heated, usually with water-cooled or air-cooled cooling furnace shell. Chamber of a stove or furnace located sealing furnace shell. According to use the stove, inside the furnace is equipped with different types of heating elements, such as resistor, inductor, electrode and electron gun. Metal smelting in a crucible furnace, vacuum furnace of some manipulator with active casting equipment and loading. Vacuum system is mainly composed of vacuum pump, vacuum valves and vacuum gauge, etc.

2016年8月26日星期五

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.

2016年8月23日星期二

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.

2016年8月18日星期四

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.

2016年8月16日星期二

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.

2016年8月9日星期二

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.

2016年7月11日星期一

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.

2016年6月23日星期四

What role does the vacuum induction melting furnace?

Vacuum induction melting furnace is under the condition of vacuum, using the principle of electromagnetic induction heating, vacuum melt metal smelting equipments.
The main purpose of the vacuum induction melting furnace:
Suitable for scientific research and production of nickel base and its special steel, precision alloy, high temperature alloy, rare earth metal, active metal, copper and copper alloys, hydrogen storage material, ndfeb and magnetic materials in the smelting and casting under vacuum or protective atmosphere.

2016年6月12日星期日

Continuous vacuum induction melting furnace

Continuous vacuum induction melting furnace,vertical structure, assembled by the melting chamber, the cooling chamber, temperature measurement devices, feeding devices, vacuum system, control system, melting system, cooling system, operating platform and other components.
Melting chamber,loading chamber and cooling chamber are all separated with a vacuum valve,which can load and put in the melting chamberwithout breaking the vacuum condition,adding alloy material, removing or ingot casting to achieve continuous operation, improving work efficiency. Meanwhile, the furnaces can cast more than one mold . Loading chamber and temperature measurement chamber are adopted the Electric horizontally structure,which can be fully automated operation. Mainly for the material like iron-based, nickel-based, cobalt-based alloys,other super alloy, high temperature alloys, magnetic materials and precision casting

2016年6月1日星期三

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.

2016年5月27日星期五

Vacuum single crystal directional solidification furnace

Vacuum single crystal/directional solidification furnace is using the medium frequency induction heating to melt metals or alloys , specially designed holding furnace and cooling system are formed thermal gradient, By modern equipment directionally solidified and single crystal parts of the pull-down mechanism to get maximum temperature gradient and the formation of the solidification interface, it adopts a a structure specifically designed to meet the requirements of the temperature gradient.Application field:production of high-temperature aerospace materials.

2016年5月19日星期四

Vacuum Induction Melting

2016年5月4日星期三

Vacuum Furnaces for Heat Treating, Brazing and Sintering Introduction

processing temperatures that are more efficiently accomplished by electric vacuum furnaces. Further-more, the food and medical instrument industries have become attracted to the“bright” non-oxidized finish
on parts heat treated by vacuum furnaces, which eliminates a cleaning step. There are a wide variety of electric and fuel-fired furnace types used for materials processing. Each furnace type has advantages and disadvantages depending on the process being conducted. Selection
of the furnace type depends on the type and volume of material being processed,the process economics, and the user’spreferences. One furnace type gaining increased usage is the electric vacuum furnace (Figure 1). The connected electric load for this type of furnace is typically
in the range of 40 kW to 300 kW.
Applications
Electric vacuum furnaces can provide this level of quality. Also, the automotive industry’s switch to lighter, stronger materials has created a need for higher Process Fundamentals
Applications for these high-temperature electrically heated
vacuum furnaces include:
Electrically heated vacuum furnace technology has eliminated environmental problems associated with salt bath furnaces. Electric vacuum furnaces also provide more precise control than traditional gas-fired furnace technology.In addition, more demanding quality requirements for high temperature processing, such as that imposed by the aerospace industry, have pressured the heat treat industry for continuously improved reliability and repeatability.

订阅：博文 (Atom)