Vacuum brazing furnace model

The vacuum brazing furnace produced by the vacuum furnace manufacturer is a large-scale heat treatment equipment, which can perform various processes such as vacuum annealing, vacuum brazing, and vacuum aging. Can be programmed into a number of different programs, can control and program hundreds of heat treatment curve points, divided into up, down, left and right and front and back six areas for temperature control, multi-point and single-point temperature recorder and over-temperature protection device The uniformity of the furnace temperature can be controlled within a constant temperature range, in addition to the high-purity nitrogen high-flow heavy-duty device.

At present, vacuum brazing furnaces produced by vacuum furnace manufacturers are mainly used for vacuum aluminum brazing of air conditioner evaporators, radar network antennas, aluminum plate-fin heat exchangers, waveguides and automobile heat exchangers, and can also be used for vacuum brazing. High temperature brazing of materials such as cemented carbide, stainless steel, titanium alloys and high temperature alloys.

Vacuum brazing furnaces can be divided into two types depending on the application: one is a VBF series vacuum brazing furnace, and the other is a VHB series high temperature vacuum brazing furnace.

Vacuum brazing furnaces produced by vacuum furnace manufacturers have the following characteristics:

1. The vacuum brazing furnace asks for notes when heating. Therefore, it does not affect the physical and chemical properties of the base metal or has a relatively small effect. Vacuum brazing furnaces can successfully weld some complex parts, such as multiple welds of a heat exchanger.

2. The deformation of the workpiece treated by the vacuum brazing furnace is relatively small, and it is relatively easy to ensure the size of the assembly. Since it is heated in a vacuum state, it is advantageous for removing the oxide film and the grease on the surface of the workpiece, and therefore, the surface brightness of the workpiece is relatively high. In addition, since the vacuum brazing furnace does not require a flux, it is not necessary to perform a cleaning process after welding.

High-Temperature-Vacuum-Brazing-Furnace-Made-in-China

Industrial-Vacuum-Brazing-Furnace-Cost-Price

Three-chamber-horizontal-high-temperature-Brazing-vacuum-furnace

Multifunctional-Vacuum-Quartz-Tube-Brazing-Furnace

Vacuum Gas Quenching Furnace Characteristics

Vacuum quenching furnace is composed of heating furnace cover and movable chassis. It is a very advanced vacuum heat treatment equipment at present. Its excellent performance and unique design provide a wide range of characteristics such as vacuum bright gas quenching, annealing, sintering and rapid cooling of alloy materials such as high-speed steel, die steel, stainless steel, alloy steel and titanium alloy.

vacuum quenching furnace equipment characteristics :

(1) Temperature uniformity

The temperature uniformity required by users is achieved by circulating fan, air guide cover plate, furnace structure and electrothermal power.

Distribution and layout of electrothermal components, control mode and process, furnace door structure and other related design to ensure.

(2) Advanced mechanical systems

The advanced nature of the system is guaranteed by design, component selection and quality, and processing and manufacturing quality. The mechanical system runs smoothly and reliably, and the equipment is in low noise and low vibration state.

(3) Perfect control system

The system is stable and reliable, easy to operate, avoiding artificial misoperation, complete functions and so on.

(4) Quick and adjustable quenching transfer time

The double-speed lifting mechanism and advanced mechanical system make quenching transfer fast and reliable, and the time can be adjusted according to user's technological requirements.

Vacuum-Hot-Press-Furnace-for-Hot-Pressing

Vacuum-Consumable-Electrode-Arc-Furnace-for-Remelting

Vacuum-Varying-Pressure-Nitriding-Furnace

Vacuum Furnace Safe Operation

Vacuum heat treatment furnace is an advanced heat treatment equipment developed in recent years. Workpieces are heated and cooled in ultra-low pressure space. It has the advantages of good quality, energy saving, safety and less pollution.

The heating body of the vacuum furnace uses low voltage electricity, but the power supply voltage is still 380V. Safe electricity is still needed when operating.

When making vacuum furnace, it should be guaranteed that there is no leakage of air and water. The sealing of vacuum furnace body and cover is made of rubber parts, so water barrier is needed for cooling. If water leaks into the furnace, the furnace temperature will be very high, which will cause blasting. Workpieces processed by vacuum furnace should be cleaned of oil contamination on the surface, and oil vapor from quenching tank should be avoided from entering the furnace together. The mixture of oil vapor and air will form a blasting atmosphere. Once there is open fire or electricity, the blasting will occur. Therefore, the door of the vacuum furnace should be closed after charging, and the furnace can be heated by electricity only after vacuum is pumped out.

Advantages and Disadvantages of Vacuum Gas Quenching Furnace

Advantages: decarbonization under vacuum condition, small deformation. The appearance is bright and the function is improved. No decarbonization/oxidation.

Disadvantage: Cost is too high. Only suitable for high precision parts.

Note: Vacuum quenching is to complete the heat treatment process in a thin vacuum, mainly by radiation heating, no oxidation decarbonization, general quenching is to complete the heat treatment process in air, mainly by convection and conduction! The appearance depends on the atmosphere.

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Pit-vacuum-tempering-furnace

Control-Induction-Heating-Vacuum-Graphitization-Furnace

Vacuum furnace quenching

Many people know that there is a kind of treatment method called quenching in the process of work-piece processing, which is commonly used in most furnaces, but the process of vacuum furnace quenching is still unclear to some people, even unfamiliar. In fact, the vacuum furnace manufacturers quench the workpiece mainly in order to improve the hardness, wear resistance and toughness of the workpiece, so as to meet different work needs. At present, quenching technology is widely used in mechanical manufacturing industry. The following vacuum furnace manufacturer briefly introduces the matters needing attention when quenching the vacuum furnace.

In the process of oil quenching heating by vacuum furnace quenching, under too low vacuum pressure, vacuum quenching oil will not be able to cool down because of too low pressure. At this time, for the equipment of furnace inner wall, especially the bottom plate, how to select the metal quality is the most important, because the thermal conductivity of different metals is very different, it can be straight. It involves the quenching effect of vacuum furnace.

For this matter, the vacuum furnace manufacturer reminds us that before using the vacuum furnace to quench, high density inactive gas should be added into the quenching chamber to produce pressure on the surface of the oil fire. Only in this way can the work and surface smoothness of stainless steel in the quenching process be fully reflected.

If it is hard steel, the process of filling inert gas can be neglected.

1. Fill the reservoir of vacuum sintering furnace with water to keep the water quality clear and free of impurities. Start the water pump, let the medium frequency power supply, furnace cooling system and vacuum furnace inductor circulate normally, adjust the water pressure, and control the water pressure of the vacuum sintering furnace water pump at the prescribed value.

2. Check the power supply system of the vacuum pump and adjust the vacuum pump oil in the middle line of the oil seal observation hole. After the inspection, the belt disc of the vacuum pump can be manually rotated. If there is no abnormality, the vacuum pump can be started when the butterfly valve is closed.

3. Inspecting the internal condition of vacuum sintering furnace requires that the hygiene inside the vacuum sintering furnace meet the standard, the insulation of the induction ring is good, the sealing vacuum tape should have certain elasticity and the size should be qualified. Check whether the lever handle of vacuum sintering furnace is flexible to start.

4. After the vacuum reaches the required requirements, start the frequency conversion, adjust the power of intermediate frequency, and operate according to the relevant sintering regulations. After sintering, stop the frequency conversion, press the stop frequency conversion switch, the inverters stop working, and disconnect the intermediate frequency power supply and the main power supply.

5. Observing the internal condition of the furnace from the observation hole of the furnace body of the vacuum sintering furnace. If the furnace blackens, the butterfly valve of the vacuum pump should be closed first, the current of the vacuum pump should be disconnected, and then the induction coil and the furnace body should be cooled with tap water to stop the pump.

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Vacuum-Furnace-Manufacturer

What preparatory work should be done before the operation of vacuum sintering furnace

The preparation work of vacuum sintering furnace before operation is as follows:

1. Check the power supply system of the vacuum pump, the belt of the belt disc is tightened, and whether the vacuum pump oil is located in the middle line of the oil seal observation hole.

2. After checking, the belt disc of the vacuum pump can be manually rotated. If there is no abnormality, the vacuum pump can be started when the butterfly valve is closed.

3. To check the condition of vacuum sintering furnace, it is required that the vacuum furnace should be hygienic at the first level, the induction coil should be well insulated, the sealing vacuum tape should be elastic and the size should be qualified.

4. Check whether the lever handle of the vacuum furnace body is flexible to start.

5. Check whether the rotating Maxwell vacuum gauge meets the requirements.

6. Check the graphite crucible and whether the furnace fittings are complete.

7. After the above preparations are completed, turn on the power supply, turn on the medium frequency power supply, try to start the frequency conversion according to the intermediate frequency start-up rule, and stop the frequency conversion after success before the furnace can be opened.

8. The observation and temperature measurement holes on the top of the vacuum furnace body should be cleaned every time the furnace is opened for observation and temperature measurement.

9. According to different sintered products, appropriate charging methods should be adopted. Packing according to relevant material charging rules shall not be changed at will.

10. In order to maintain constant temperature and prevent thermal radiation, two layers of carbon fibers are added to the heating crucible and then covered with a heat shield.

11. Pad the vacuum sealing tape.

12. Workpieces or containers that are prone to volatilization and affect vacuum hygiene under vacuum conditions and cause pipeline blockage and dirty vacuum pumps shall not be put into the furnace.

13. Where the product is added with forming agent (such as oil or paraffin), it must be removed before sintering into the furnace, otherwise it will cause adverse consequences.

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Vacuum-Argon-Atmosphere-Sintering-Furnace

The Difference between Vacuum Furnace and Atmospheric Furnace

Vacuum furnace, the equipment has a high vacuum, because its structure is circular, can be pumped to a high vacuum. Atmosphere furnace, as its name implies, is able to ventilate the atmosphere, such as hydrogen, nitrogen, carbon dioxide, argon, carbon monoxide and other gases, to meet customer demand for product processing. The structure of the atmosphere furnace is an improved version of the ordinary muffle furnace. On the basis of the muffle furnace, the box is fully welded and sealed by silicone rubber. The door of the furnace has a cooling water system. There are several inlet and outlet valves, pressure gauges and vacuum pumps on the furnace body. Customers can enter and outlet air at the same time. At the same time, vacuum can be pumped and positive pressure can be flushed. But the vacuum degree is certain. Most of the atmosphere furnaces produced in the market are square. The structure determines that they can not get high vacuum degree.

So why do we need an atmosphere furnace when we have a vacuum furnace? This is because of the price. Generally, the price of vacuum oven is above 20W, while the price of small atmosphere oven is only about 2W. If the customer's demand for vacuum is not high, the atmosphere oven can meet its use requirements. How do you say the customer will choose? In addition, the atmosphere furnace generally intake and exhaust at the same time, through the protection of gas, can also prevent air into the furnace, can fully meet the requirements of product processing.

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Vacuum-Induction-Furnace-for-Nonferrous-Metals

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Vacuum Furnace Structure and Function

Vacuum furnace is generally composed of main engine, furnace, electric heating device, sealed furnace shell, vacuum system, power supply system, temperature control system and outside furnace transport vehicle. Sealing furnace shell is welded with carbon steel or stainless steel, and the joint surface of removable parts is sealed with vacuum sealing material. In order to prevent the shell from deforming and sealing material from deteriorating after heating, the shell is usually cooled by water or gas. The furnace is located in a sealed shell.

According to the use of the furnace, the furnace is equipped with different types of heating elements, such as resistance, induction coil, electrodes and electronic guns. The vacuum furnace for smelting metals is equipped with crucibles, and some are equipped with automatic pouring devices and loading and unloading manipulators. The vacuum system is mainly composed of vacuum pump, vacuum valve and vacuum meter.

Vacuum Furnace Function:

Vacuum quenching (tempering, annealing) is a method to achieve the desired performance by heating and cooling materials or parts in vacuum according to process regulations.

Vacuum brazing is a kind of welding process in which a group of welding parts are heated to the melting point temperature of filler metal above but below the melting point temperature of matrix metal under vacuum condition, and the welding seam is formed by wetting and flowing of filler metal to matrix metal (brazing temperature varies with material).

Vacuum sintering is a method of sintering metal powder products into parts through adhesion and diffusion of adjacent metal powder grains by heating them in vacuum.

Vacuum Debinding Furnace


Vacuum Heat Treatment Furnaces


Vacuum Brazing Furnace


Vacuum Induction Melting Furnaces

Vacuum Hot Press Furnace System

Vacuum hot pressing furnaces are usually composed of several mechanical systems, as follows:

1. Vacuum system: It consists of oil diffusion pump, Roots pump, mechanical pump distribution electromagnetic pressure differential valve (to prevent sudden power outage, mechanical pump oil backfilling) inflatable valve, exhaust valve, vacuum butterfly valve, vacuum pressure gauge (+Pa) bellows, vacuum pipeline and support.

2. Hydraulic system: electric input mode is adopted. The hydraulic station is equipped with imported proportional valves, pressure sensors, displacement display, grating ruler (ranging accuracy 0.02 mm), hydraulic cylinder and other related hydraulic devices. The pressure regulation is semi-automatic and can be adjusted manually. The instrument can set the pressure automatically, and can realize voltage stabilization and holding.

3. Water cooling system: It is composed of various valve and pipeline related devices and has the function of automatically cutting off heating source or function of water-cut sound and light alarm.

4. Temperature control system: SCR is used to control temperature, equipped with PID function instrument and digital display meter. It has the function of over-temperature sound and light alarm. PLC touch screen can also be used to control temperature automatically, and historical data can be retained to facilitate the analysis of sintering process.

5. Inflation system: It is composed of various pipelines and valves, and equipped with electromagnetic vent valve and pressure sensor. When the pressure in the furnace is higher than the safety value, it will automatically vent. The inflatable pipeline is equipped with needle valve, which can control the inflatable volume.

Oil Diffusion Vacuum Pump


Oil Booster Pump


Vacuum Sintering Furnace

Vacuum Sintering Furnace Operation Rules

1. Medium frequency power supply, vacuum furnace body and cooling water source of induction coil-water storage tank must be filled with water, and impurities must not be found in the water.

2. Turn on the water pump to make the medium frequency power supply, the induction coil of the vacuum furnace and the cooling system of the furnace body circulate normally, and adjust the water pressure to control at the prescribed value.

3. Check the power supply system of the vacuum pump, the belt of the belt disc is tightened, and whether the vacuum pump oil is located in the middle line of the oil seal observation hole. After checking, the belt disc of the vacuum pump can be manually rotated. If there is no abnormality, the vacuum pump can be started when the butterfly valve is closed.

4. Inspecting the condition of vacuum sintering furnace, it is required that the vacuum furnace should be hygienic, the induction coil should be well insulated, the sealing vacuum tape should be elastic and the size should be qualified.

5. Check whether the lever handle of the vacuum furnace body is flexible to start.

6. Check whether the rotating Maxwell vacuum gauge meets the requirements.

7. Check the graphite crucible and whether the furnace fittings are complete.

8. After the above preparations are completed, turn on the power supply, turn on the medium frequency power supply, try to start the frequency conversion according to the intermediate frequency start-up rule, and stop the frequency conversion after success before the furnace can be opened.

9. The observation and temperature measurement holes of the upper cover of the vacuum sintering furnace need to be cleaned every time the furnace is opened for observation and temperature measurement.

10. According to different sintering products, the corresponding charging mode should be adopted. Packing according to relevant material charging rules shall not be changed at will.

Roots vacuum pump

Liquid Ring Vacuum compressor

Dry Type Vacuum Pump

Multi-chamber Continuous Vacuum Furnace

At present, most of the vacuum furnaces used in various industries in our country are single chamber or double chamber, which has obvious shortcomings, such as high cost, high energy consumption, low efficiency and so on. In order to overcome the above shortcomings and meet the needs of modern industry, our company independently developed a new type of multi-chamber continuous vacuum furnace. The equipment has excellent performance, ideal operation and simple operation.

A general survey of multi-chamber continuous vacuum furnace is composed of feeding chamber, preheating chamber, high temperature studio, cooling chamber, discharging chamber, intermediate gate valve, vacuum system, workpiece transfer system, water cooling system and electronic control system. Unique building block design allows users to easily build different production lines, such as five rooms, eight rooms and so on.

The new type of vacuum furnace is the further application and extension of induction melting technology. The vacuum furnace body adopts square box structure, which is practical and beautiful, and can effectively reduce the butt transfer between the charging car outside the furnace and the roller axle inside the furnace.

Vacuum system of vacuum furnace adopts digital display compound vacuum gauge, high vacuum is measured by ionization gauge and low vacuum is measured by resistance gauge. The heating system composed of preheating room and high temperature studio has the advantages of good heat preservation effect and energy saving. In addition, the vacuum furnace also has a new type of pneumatic gate valve, workpiece truck transfer system and automatic control system, temperature control intelligent and flexible. In short, the excellent performance of vacuum furnace has been recognized by the industry.

Multi-chamber continuous vacuum furnace has the same powerful ability as induction melting technology. It can realize large-scale pipeline production in vacuum brazing, vacuum sintering and vacuum heat treatment of metal materials.

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Vacuum Furnace of Vacuum Nitriding Technology

Vacuum nitriding is also known as vacuum exhaust nitrocarburizing. As the name implies, vacuum nitriding technology is vacuum furnace through vacuum technology, clean and activate metal surface. In the process of heating, heat preservation and cooling, trace gases are discharged and activated gases are input. The hardness and toughness of vacuum furnace can be enhanced by vacuum nitriding technology.

If the chromium content in the material is very high, its hardness will also increase. The hardness of the single-phase epsilon compound layer varies with the chromium content of the material: when the chromium content of the material is 13%, the hardness is 1200HV, and when the chromium content of the material reaches 18%, the hardness reaches 1500HV. When the chromium content of the material is 25%, the hardness can reach 1700HV. The wear resistance of single-phase epsilon compound layer with high chromium content is very high. It has high temperature resistance, low temperature resistance and wear resistance. The hardness and toughness of single-phase epsilon compound layer are high, so it is easy to cause cracks in forging die in the early stage of casting, and pinholes are easy to appear in vacuum furnace during welding repair.

Vacuum nitriding technology can harden steel. The principles of vacuum nitriding and ion nitriding are different. Vacuum nitriding requires that steel be heated in a vacuum furnace first. After heating, a small amount of gas is washed in. Then nitrogen atoms gradually permeate and diffuse into the steel, gradually achieving hardening. Ion nitriding only heats the surface of steel, then the active nitrogen ion penetrates into the surface of steel, and then a series of chemical reactions occur, which makes the hardness of steel increase. The steel processed by ion nitriding technology is not as good as that processed by vacuum nitriding technology. Because this technology only needs to process the surface of steel, it does not need vacuum furnace to heat.

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Vacuum Brazing Furnace of common Types

No matter what type of vacuum brazing furnace is, the principle of application is different, but its effect is almost the same. Let's look at the main types of vacuum brazing furnace.

1. Hot-wall vacuum brazing furnace. Hot-wall brazing furnace is a kind of vacuum brazing vessel. The brazing parts assembled with brazing filler metal are put into the vessel. The vessel is heated to brazing temperature in a non-vacuum furnace, and then the vessel is cooled naturally in the air. Its application scope mainly includes alloy steel, titanium alloy, aluminium alloy and refractory alloy of elements such as Cr, Ti and Al.

2. Cold-wall vacuum brazing furnace. The characteristics of this brazing furnace are as follows:

No matter what type of vacuum brazing furnace is, the principle of application is different, but its effect is almost the same. Let's look at the main types of vacuum brazing furnace.

1. Hot-wall vacuum brazing furnace. Hot-wall brazing furnace is a kind of vacuum brazing vessel. The brazing parts assembled with brazing filler metal are put into the vessel. The vessel is heated to brazing temperature in a non-vacuum furnace, and then the vessel is cooled naturally in the air. Its application scope mainly includes alloy steel, titanium alloy, aluminium alloy and refractory alloy of elements such as Cr, Ti and Al.

2. Cold-wall vacuum brazing furnace. The characteristics of the brazing furnace are as follows: the heating furnace is integrated with the brazing chamber, the furnace wall is used as a water-cooled sleeve, and the built-in heat reflecting screen is used to avoid heat radiation, improve the thermal efficiency and seal the furnace cover. After brazing, the weld is cooled with furnace, and its application range is the same as that of hot wall brazing furnace.

There are two main types of vacuum brazing furnaces. Before purchasing, we need to consult the manufacturer and choose the suitable vacuum fiber brazing furnaces according to the manufacturer's suggestions.

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Heat-treatment-process-of-Cr8-blade-steel

Vacuum Furnace Melting of Nonferrous Metal Alloys

The process of nonferrous metal melting and ingot casting in vacuum furnace from lower than normal pressure to higher vacuum (from less than 100kPa to 1.3*10-10Pa). It is not only the production of refractory, rare and active metal materials, but also the important modern smelting technology to obtain high purity and high quality metal materials.

In 1917, vacuum smelting began to transfer from laboratory to factory scale. At that time, only a small amount of nickel-based alloys, thermocouples and resistance heating materials could be smelted. During and after World War II, with the development of vacuum technology and the need of military industry and modern science and technology for high performance new metal materials, vacuum smelting has developed rapidly. Titanium materials began to be produced in large quantities in the 1950s. In the 1970s, there were tens of tons or even hundreds of tons of vacuum smelting equipment, and now it has developed into an important production department of special materials equipped with modern technology and equipment.

Vacuum smelting can produce metals with high purity, uniform material, low gas content, less impurities, fewer defects and excellent processability because of its strong purification, volatile impurities, good deoxidization effect, thermal decomposition of some nitrides and hydrides, and some chemical reactions that can not be carried out in the atmosphere, especially those formed by gas products. Material Science. High purity barium, hafnium, vanadium and thorium, superalloys, thermoelectric alloys and magnetic materials, active metal titanium and zirconium, refractory metal tungsten, molybdenum, tantalum, niobium and copper and nickel alloys for electric vacuum are all produced by vacuum remelting. The main vacuum smelting equipments and methods are vacuum induction furnace smelting, true arc furnace smelting (see non-ferrous metal alloy vacuum arc furnace smelting) and electron beam furnace smelting.

Vacuum induction furnace smelting is to place inductors and crucibles in vacuum and melt them in 1.3 *10-2-1.3 *10-3a vacuum for the production of high temperature and precision alloys. Electron beam furnace (EBF) melting is a process in which electron beams are emitted by one or more electron guns in high vacuum (1.3 *10-1~1.3 *10-5Pa), and the melted object is bombarded and dripped into a water-cooled copper crystallizer to form ingots. Electron beam furnace smelting is suitable for the smelting of ultrapure metals and refractory metals.

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Vertical Vacuum Furnace Working Principle

Vertical vacuum furnace is a protective furnace for heated objects in vacuum environment. There are many heating modes, such as resistance heating, induction heating, microwave heating and so on. Vacuum induction furnace is a kind of furnace which uses induction heating to protect heated objects. It can be divided into power frequency, intermediate frequency, high frequency and other types, and can be classified as a subcategory of vertical vacuum furnace.

Vacuum induction furnace is a complete set of equipment for the production of cemented carbide, dysprosium metal and ceramics by using the principle of medium frequency induction heating under vacuum or protective atmosphere.

The main principle and application of vacuum induction tungsten furnace is to make tungsten crucible in coil produce high temperature under the protection of hydrogen after vacuum pumping. It is conductive to work through heat radiation. It is suitable for powder forming of refractory alloys such as tungsten, molybdenum and their alloys by scientific research and military units. Secondly, the main structure and composition of the structure are mostly vertical and discharge mode. Its main components are: electric furnace body, vacuum system, water cooling system, pneumatic system, hydraulic system, feeding and discharging mechanism, base, worktable, induction heating device (tungsten heater and advanced thermal insulation material), power supply device, medium frequency power supply and electrical control system, etc. 3. The main function is to fill the hydrogen protective gas after vacuum evacuation to control the pressure and atmosphere in the furnace. Optical fibre infrared radiation thermometer and armored thermocouple can be used to continuously measure temperature (0-2500 C). After comparing with the setting program, the intelligent temperature controller can choose to implement state feedback to medium frequency power supply, automatically control the temperature and heat preservation program.

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vacuum-tempering-furnace-for-titanium-alloy

High-perfomance-super-cheap-vacuum-tempering-furnace

Heat Treatment Skills of Vacuum Furnace

With the progress and development of industrialization, vacuum furnace plays an irreplaceable role in mould production. It is mainly used in ceramic firing, vacuum smelting, degassing of electric vacuum parts, annealing, brazing of metal parts, and ceramic-metal sealing. Vacuum heat treatment of vacuum furnace can realize almost all heat treatment processes, such as quenching, annealing, tempering, carburizing, nitriding, gas quenching, oil quenching, nitrate quenching, water quenching, vacuum brazing, sintering, surface treatment and so on. Vacuum furnace has high thermal efficiency, can achieve rapid heating and cooling, can achieve no oxidation, no decarbonization, no carburization, can remove the phosphorus chip on the surface of the workpiece, and degreasing and degassing, so as to achieve the effect of surface bright purification.

Generally speaking, the processed workpiece is heated slowly in the furnace, the difference of internal heat temperature is small, and the thermal stress is small, so the deformation is small. The qualified rate of products is high. The utility model can reduce the cost and has the function of degassing, thereby improving the mechanical performance and service life of the work. Good working environment, safe operation, no pollution and pollution. The treated workpiece has no danger of hydrogen embrittlement. It can prevent surface hydrogen embrittlement of titanium and refractory metal shell. The vacuum heat treatment process has good stability and repeatability. With these advantages, the development of vacuum heat treatment equipment and technology has been paid more and more attention and applied more and more widely.

Vacuum heat treatment is a comprehensive technology combining vacuum technology with heat treatment. It refers to all and part of heat treatment process carried out in vacuum. China divides vacuum into low, medium, high and ultra-high vacuum.

Vacuum furnaces and medium frequency electric furnaces have good prospects in the field of thermal processing. They are used for induction heating of diathermy, rolling, forging, pipe bending, heat treatment (quenching), welding and other processes.

Mesh-Belt-vacuum-Tempering-Furnace

Continuous-Vacuum-Tempering-Industrial-Furnace

Vacuum-Tempering-furnace-manufacturer

Vacuum Furnace Structure and Technology

Vacuum furnace is a kind of equipment that we use more in many production. So, what are the structural and technological characteristics of this kind of equipment? This is a question that we are going to introduce to you today. Now let's get to know it.

The technological process of vacuum furnace is as follows: the workpiece is put into the charging table enters the channel tank rises to the loading and unloading chamber, evacuates transfers the workpiece to the carburizing chamber to heat the workpiece and carburizes moves downward to the adiabatic chamber, and then transports to the gas quenching chamber to enter and cool exit the furnace.

Key points of vacuum furnace operation:

(1) Loading and unloading chamber: When the loading and unloading chamber enters the workpiece, it is vacuum pumped up to 6*102 Pa. When the chamber is equal to the pressure of the channel tank, the vacuum sealing valve is opened, and the lift transfers the workpiece down to the pressure of the channel tank and transmits it to the carburizing chamber.

(2) Heating carburizing chamber and carburizing process:

1. Carburizing temperature is 920-970 (1250).

2. The rotating speed of workpiece in carburizing furnace is 2 rpm.

3. C3H8 and N2 are injected into the furnace alternately by pulse through the heat-resistant steel nozzle, and [C]+H2 is formed after C3H8 is cracked. (Generally, the time of C3H8 and N2 diffusion is 1-4 min and 2-6 min in the period of strong osmosis, then the period of strong osmosis is gradually shortened and the period of diffusion is gradually prolonged, as shown in the table).

4. The carburizing process (including carburizing and diffusion) is controlled by four parameters: temperature, time, flow rate and pressure of C3H8 and N2. According to the technical requirements of the workpiece, various technical parameters are determined by computer simulation to realize the automatic control of carburizing process (developing dynamic control technology).

(3) Gas quenching uses adjustable (1-20)*105Pa high purity N2 to form a cooling channel in the carburizing furnace to cool the workpiece.

Vacuum-Sintering-Furnace-Air-Leak-Detection-Solution

vacuum-furnace-maintenance-precautions

High-Temperature-Vacuum-Brazing-Furnace-Operating-Regulations

How-to-Safely-Operate-Vacuum-Oil-Quenching-Furnace

Vacuum Furnace Performance Advantages

Vacuum furnace is mainly suitable for vacuum quenching of stainless steel, die steel and low-pressure vacuum carburizing. It is also suitable for vacuum quenching of other tools, dies, bearing steel and other materials.

Vacuum furnaces advantages :

1. Vacuum furnace is different from ordinary low-pressure carburizing method. The carburizing process fully meets the following industrial requirements:

2. Heavy and high density load handling;

3. High permeability in the pore;

4. The tolerance of carburizing depth decreases.

5. Excellent control of surface carbon;

6. The gas used for low pressure carburizing can usually be replaced by another gas, which ensures that it can be reused without producing propane and carbon black or methane that is difficult to manage its decomposition.

Vacuum-pump-oil-leakage-solution

Water-Ring-Vacuum-Pump-Common-Solutions

Vacuum-Furnace-Faults-Solutions

pressure sintering furnace structure description

1. The pressure sintering furnace is a vertical structure with double-layer water interlayer structure. The inner, outer walls and flanges are 304 stainless steel. The furnace body is divided into two parts, one third of which is that the furnace cover can be opened completely by hand, and two thirds of which are fixed furnace body. The design is unique and easy to operate.

2. Vacuum system: It consists of oil diffusion pump, Roots pump, mechanical pump distribution electromagnetic pressure differential valve (to prevent sudden power outage, mechanical pump oil backfilling) inflatable valve, exhaust valve, vacuum butterfly valve, vacuum pressure gauge (+Pa) bellows, vacuum pipeline and support, etc.

3. Hydraulic system: electric input mode is adopted. The hydraulic station is equipped with imported proportional valves, pressure sensors, displacement display, grating ruler (ranging accuracy 0.02 mm), hydraulic cylinder and other related hydraulic devices. The pressure regulation is semi-automatic and can be adjusted manually. The instrument can set the pressure automatically, and can realize voltage stabilization and holding.

4. Water-cooling system: It is composed of various valve and pipeline related devices and has the function of automatically cutting off heating source or function of water-cut sound and light alarm.

5. Temperature control system: Pressure sintering furnace uses silicon controlled temperature, equipped with PID function instrument, digital display meter, with over-temperature sound and light alarm function, also can choose PLC touch screen automatic control, and retain historical data, so as to facilitate the analysis of sintering process.

6. Inflation system: It is composed of various pipelines and valves, and equipped with electromagnetic vent valve and pressure sensor. When the pressure in the furnace is higher than the safety value, it will automatically vent. The inflatable pipeline is equipped with needle valve, which can control the inflatable volume.

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Principle of Vacuum Decarbonization in Vacuum Furnace

In the process of decarbonization by vacuum treatment, there are three reaction positions in the vacuum chamber of vacuum furnace, namely, the surface of molten pool, the surface of argon bubbles and the molten pool. Vacuum treatment is based on thermodynamics and kinetics of metallurgical reaction.

It can be understood that thermodynamics represents the stable content and controllable accuracy of the final state of the chemical reaction, and dynamics represents the time required to complete the chemical reaction process and form the final product. From the thermodynamic point of view of decarburization, decarburization, oxygen in molten steel and vacuum conditions are based on the influence of pressure on chemical reaction. When gas pressure decreases, chemical reaction ([C]+ [O] CO) is promoted. From the point of view of decarbonization kinetics, it is mainly to study how long it takes to reach the equilibrium value, that is, the required target carbon content.

Through the optimization of process parameters and operation process, the spattering of vacuum decarbonization process was effectively controlled, the ignition failure of top gun was significantly reduced, and the replacement frequency of hot elbow was greatly reduced, which increased from 280 times to 563 times on average, and the productivity of RH furnace was improved. Deep decarbonization time decreased from 20 minutes to 15 minutes, carbon content decreased from 20 ppm to less than 15 ppm after decarbonization, and the hit rate of terminal temperature also increased significantly. In addition, the life of the impregnated pipe increased from 60.9 times to 87.5 times, and the life of the bottom groove increased from 172.4 times to 21.4 times, resulting in obvious economic benefits.

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Induction melting process

The basic principle of induction melting is electromagnetic induction principle and current-heat effect principle. The inner part of induction melting is assumed to be a cylinder. The simplified physical model is shown in Fig. L. The induction coil is connected to the alternating current, and the alternating magnetic field is generated in the surrounding space. The magnetic force line of the magnetic field will partly penetrate the metal burden in the furnace. The flux change of alternating magnetic field produces induction electromotive force, and the induction current will be generated inside the charge. The current will flow inside the charge with a certain impedance, and the heat generated will heat the charge and melt it into a melt.

Melting is the first step in casting production. It is important to control the quality of liquid metal and the cost of induction melting for casting quality and production cost. As the main melting equipment, induction furnace can homogenize the temperature of liquid metal, easily control the oxidation of liquid metal and reduce the burning loss of elements in the melting process. It is used in more and more occasions. In recent years, the research on Optimization of induction smelting process in electric furnaces has shown strong advantages by using computer technology. Some foreign scholars have studied the transverse flux induction heating of magnetic and non-magnetic materials, and established a model describing the intensity of electromagnetic field. Using finite element method and boundary element method, the coupled thermo-electro-magnetohydrodynamic model considering phase transformation is studied. The results provide a certain basis for industrial furnace design.

In summary, most of the scholars'research work is focused on single physical field, few coupled multi-physical field studies, and the results are not visualized well, which is not easy to analyze: or the application of induction heating in a single workpiece. Based on the existing computer numerical simulation technology of the solidification simulation group of Huazhong University of Science and Technology, the heat transfer behavior of the melt in induction furnace is numerically simulated, the temperature field is quantitatively predicted and the law of the behavior is revealed, which has a certain guiding role in adjusting the technological parameters of the melting process in the actual production.


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Automatic Control System of Vacuum Furnace

The quality of brazing products is directly affected by the performance of the necessary equipment in brazing process. Vacuum furnace system is mainly composed of vacuum system and heating system and related control equipment. The vacuum system consists of mechanical pump, diffusion pump, main valve, bypass valve and high vacuum baffle valve. The mechanical pump is a rough vacuum device. Its power source is three-phase AC motor, and the high vacuum oil diffusion pump is a high vacuum device. With the help of the former mechanical pump, the oil diffusion pump and the electric furnace heating, the pumping work required for high vacuum is completed, which is controlled by contactor.

The heating system of vacuum furnace is composed of heating power supply and heating elements. The heating power supply uses magnetic voltage regulator and DC excitation power supply to realize smooth stepless voltage regulation without contacts and loads. The DC excitation power supply is controlled by power regulator. The power regulator uses the difference between the current value of furnace temperature and the set value detected by thermocouple through temperature controller to output DC signal through PID calculation. The magnetic saturation voltage in the magnetic voltage regulator is controlled, and the heating current and temperature are automatically regulated according to the temperature control curve set by the temperature controller.

The control objectives of the automatic control system of vacuum furnace are: to realize automatic/manual air pumping function; to display the vacuum degree of the instrument, and to carry out manual or automatic control of the brazing process in accordance with the requirements of the vacuum degree; to realize automatic computer programmable control and manual control, digital display, automatic recording, over-temperature, water cut-off and couple break-off by temperature controller, thermocouple and trigger. Dynamic alarm, high temperature chamber and medium greenhouse are vacuum cooling.

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