Maintenance of Vacuum Furnace

In the process of using vacuum furnace, we usually encounter the problem of carbon deposit. Today, let's analyze some reasons for carbon deposit in vacuum furnace.

1. No charcoal burning for a long time;

2. Failure of carbon controller;

3. Long-term use of high carbon potential, excessive flow of rich gas, easy to appear furnace carbon deposition.

4. Uncontrolled atmosphere

5. The easiest carbon deposit is inadequate methanol cracking.

6. Excess adsorption due to poor decomposition

If carbon deposits in radiation tubes, the consequences will be more serious. It is easy to cause the furnace temperature to rise up or slow. In this case, we can tell you that burning carbon in vacuum furnace can effectively remove carbon deposits on Anti-carburizing bricks and radiation tubes. The method is that when there is no product in the front and back chambers of the vacuum furnace, the temperature of the back chamber should be around 800 C. Then open the front door with a sickle, then extinguish the fire-fighting sickle; open the middle door for about one minute, and then open the middle door for another minute after five minutes (so repeated three times). The carbon deposit in the furnace burns almost.

Vacuum Heat Treatment Furnaces

Vacuum Brazing Furnace

Vacuum Gas Quenching Furnace Application

Usage and Characteristics: Mainly used in high-pressure gas quenching of high-speed steel, tool steel, die steel, alloy structural steel and other materials. It can also be used for brazing stainless steel at high temperature, solid solution, sintering and aging of powder materials, etc. Traditional horizontal single chamber furnace has mature structure, simple overall maintenance and high performance-price ratio.

Configuration Options: Inflation Pressure Selection: 0.6/1.0/1.5 MPa Special Material Process with Low Temperature Convection Heating Device; Low Pressure Control Device to meet the special atmospheric process requirements (such as inhibiting the volatilization of alloy elements); High Temperature Metal (Nickel Chromium, Molybdenum)/Graphite Material Heating System Selection to facilitate different temperatures or material process requirements According to the material and process requirements, the high vacuum/medium vacuum configuration can be chosen freely.

Steel-Wire-Annealing-Furnace

Electric-Resistance-Heating-Vaccum-Bright-Annealing-Furnace

What is a vacuum tempering furnace

The tempering furnace is used for tempering ordinary metal parts in air and for quenching, annealing and aging heat treatment of light alloy parts such as aluminium alloy die castings, pistons and aluminium plates. The shell is welded with steel plate and section steel. The trolley is welded with section steel and steel plate. The trolley reduces heat radiation and convection loss by soft contact with the lining and sand sealing mechanism, thus effectively ensuring the sealing of the furnace body.

Tempering furnace is a periodic operation type tempering furnace, which is used for tempering ordinary metal parts after quenching and for quenching, annealing and aging heat treatment of light alloy parts such as aluminium alloy die castings, pistons and aluminium plates.

This furnace is mainly suitable for bright annealing and tempering treatment of black and non-ferrous metal wire, strip and pipe materials, mechanical parts, electronic components and modulus tools. After treatment, the surface of the product is smooth, non-oxidizing and non-decarbonizing.

All-fibre trolley tempering furnace is mainly used for heat treatment of large and medium-sized metal or alloy parts at rated temperature. The shell of this series of electric furnace is welded with steel plate and section steel. The trolley is welded with section steel and steel plate. The trolley reduces heat radiation and convection loss by soft contact with lining and sand sealing mechanism, which effectively ensures the furnace body. Sealability.

Full Fiber Well Tempering Furnace Uses:

Wellbore tempering resistance furnace is a periodic heat treatment equipment with hot air circulation system. The maximum temperature is 650 C. It is mainly used for high temperature tempering and annealing of various metal materials. It is the most ideal equipment for processing small shaft parts. It can automatically control the heating temperature of the equipment when used in conjunction with the control system.

Vertical-Vacuum-High-Temperature-Brazing-Furnace

Giant-Vacuum-Aluminum-Brazing-Furnace

Aluminium-vacuum-brazing-furnace

Vacuum Induction Furnace Summary

Vacuum induction furnace: Vacuum induction furnace is an important equipment in vacuum smelting. The problem of vacuum sintering exists in the process flow of product smelting with or without cutting. The purpose of sintering is to sinter the expected blank into a preform for hot forging, and to ensure good malleability and ductility structure, so as to avoid defects in hot forging. Vacuum smelting furnace is mainly used for smelting precision alloys, electromagnetic materials, alloy steel and high temperature materials.

Vacuum induction furnace is divided into discontinuous type and semi-continuous type. Furnaces with capacity less than 150 kg are mostly directional type. Furnaces with capacity of 150-300 kg have both. More than 500 kg are semi-continuous. Large-scale vacuum induction furnaces of 5-7t are more in foreign countries. Vacuum induction furnaces used in smelting industry in China are mainly small and medium-sized, and are now developing towards large-scale ones.

Vacuum acquisition is still a key problem in the design and application of vacuum induction furnace. Because the temperature in the vacuum induction furnace is about 2000 C, it is difficult to reach 10-0 Torr or higher vacuum at this temperature. According to the introduction of relevant information at home and abroad, the improvement of smelting quality is obviously related to vacuum degree. For this reason, users hope that the vacuum induction furnace designed can achieve 10-8 Torr or higher vacuum degree. At present, it is relatively easy to achieve 10-5 Torr vacuum degree.

Vacuum system of vacuum induction furnace consists of mechanical pump-booster pump or mechanical pump-diffusion pump to achieve 10-5~10-5 Torr vacuum, sometimes with Roots pump. The further improvement of service life and performance of vacuum units is still a subject that needs to be further discussed and solved in practical work.

Low-Price-Vacuum-Induction-Melting-Furnace

Industrial-High-Quality-Aluminium-Ingot-Induction-Melting-Furnace

Vacuum-Induction-Melting-Furnace-for-Special-Steel

Vacuum-Induction-Melting-Furnace-for-High-Temperature-Alloy

Introduction to the Performance of Vacuum Annealing Furnace

Vacuum annealing furnace is mainly used for bright annealing of superalloy steel, magnetic material, non-ferrous metal, stainless steel, titanium alloy, etc.

The structure characteristics of vacuum annealing furnace are as follows: the heating chamber adopts stainless steel skeleton; the heat shield is a multi-layer reflecting screen with long service life and easy maintenance; the failure rate is low; the air-cooling system is composed of high-speed motor, high-pressure impeller with large air volume, and guide plate, copper-copper heat exchanger and guide device, so that the air flow can be realized by heat exchanger-fan-guide device. - The high-speed cycle of workpiece-heat exchanger enables the workpiece to be cooled quickly and evenly. The electronic control system adopts the way of PLC and programmable temperature controller to realize three control modes: full-automatic, semi-automatic and manual, with flexible operation.

Cautions for the use of vacuum annealing furnace: 1. The parameters on the vacuum meter have been adjusted. No arbitrary modification and setting are allowed. 2. During operation, attention should be paid to the changes of current, voltage and water temperature at any time, and any abnormalities should be dealt with or reported in time. 3. It is strictly forbidden to deal with electrical faults privately, so electricians should be asked to remove them. 4. If the touch screen breaks down, the manual/automatic switch can be put into the manual file, and the vacuum pumps, valves and temperature controllers can be operated from the beginning. The operation steps of the vacuum pumps, valves and temperature controllers are the same as those of the automatic ones, but the manual operation mechanism can be changed from the touch screen to the button.

The advantages of vacuum annealing are as follows: 1. No oxidation, decarbonization and carbon addition have good protection on the inner and surface of the workpiece. After vacuum annealing, the workpiece has primary color 2. Improve the overall mechanical properties, degassing and promote the purification of the metal surface. 3. It can reduce the volatility of gold-bearing elements in workpieces. 4. Vacuum annealing furnace has high thermal efficiency, controllable heating and cooling rate, good stability and repeatability. 5. Workpiece deformation is small, reducing the subsequent processing procedures and saving costs.

High-quality-vacuum-induction-melting-furnace-for-sale

lab-vacuum-high-temperature-horizontal-tube-furnace

Electric-Vacuum-Nitriding-Furnace-for-Metal-Melting

Heat Treatment Processing Technology of Experimental Electric Furnace

Heat treatment methods generally include three whole processes: heating, heat preservation and cooling. Sometimes only two whole processes are needed. These processes are interlinked and cannot be interrupted.

When metal material is heated, the workpiece is exposed to gas, which often produces air oxidation and decarbonization (that is, the carbon content on the surface of iron and steel parts decreases), which is harmful to the surface characteristics of the parts after quenching and tempering. Therefore, metal materials should be heated in controllable or protective atmosphere, molten salt and vacuum, and protective heating can also be carried out by coating or packaging.

The heating of experimental electric furnace is one of the important processes of quenching and tempering treatment. There are many ways of heat treatment of metals. At first, charcoal and coal were used as pyrogens, and liquid and gas fuels were used. The use of electricity makes heating easy to control and free from air pollution. These pyrogens can be heated immediately and indirectly through molten salts or metal materials or even floating particles.

The cooling of the experimental electric furnace is also an indispensable process in the whole process of heat treatment. The cooling mode varies with the process. The key is to control the cooling rate. Generally, the cooling rate of annealing is the slowest, normalizing is faster and quenching is faster. However, there are different requirements because of different steel grades. For example, air-hardened steel can be hardened by normalizing at the same cooling rate.

Heating temperature is one of the important process parameters of heat treatment method. Selecting and manipulating heating temperature is the key to ensure the quality of quenching and tempering treatment. The heating temperature varies with the purpose of the treated metal materials and quenching and tempering, but it is generally heated above the phase transition temperature to obtain the high temperature structure. Another change takes a certain time, so when the surface of the metal workpiece exceeds the required heating temperature, the temperature must be maintained for a certain period of time, so that the internal and external temperatures are consistent, so that the microstructures change completely. This period is called holding time. When choosing high energy density heating and surface conditioning treatment, the heating rate is very fast, generally there is no heat preservation time, and the heat preservation time of chemical conditioning treatment is often longer.

High-Temperature-Tungsten-Carbide-Vacuum-Sintering-Furnace

Customized-Hydrogen-Sintering-Furnaces

Customized-hydrogen-brazing-furnace

Vaccuum-Nitriding-Furnace

High Temperature Box Atmosphere Furnace

High temperature box atmosphere furnace is an advanced experimental equipment, which is suitable for diffusion welding of metals, nano, single crystal silicon, polycrystalline silicon, batteries, etc. and heating equipment of atmosphere heat treatment under vacuum gas protection. Mainly used in material testing, synthesis, sintering and so on. The furnace body has good thermal insulation performance and remarkable energy saving effect. It can also be used for vacuum hot pressing sintering of composites, powders, structural ceramics and alloys.

The electric part of the high temperature box type atmosphere furnace adopts an integrated structure with the furnace body. The whole electrical component is installed on one side of the bottom of the furnace body, which has compact structure and occupies less space. Temperature control is installed on the side panel of the furnace body. The observation is intuitive and the adjustment is convenient. The temperature control instrument has the function of expert PID adjustment. It can automatically track and set the best PID value. It can arbitrarily set the measuring indexing password. At the same time, it has the function of compensation, which can make the furnace temperature consistent with the display value.

The gas passes through the flowmeter and enters and exits from the back chamber. There are burning nozzles at the inlet and outlet of the furnace, which can pass hydrogen, nitrogen, oxygen, carbon monoxide, ammonia decomposition gas and other gases. The furnace has the advantages of balanced temperature field, low surface temperature, fast temperature rise and fall, energy saving and so on. It is a university, scientific research institute, industrial and mining enterprise. It is an ideal product for atmosphere protection sintering and atmosphere reduction.

The high temperature box-type atmosphere furnace body is equipped with a vacuum pipeline. First, the air in the furnace is pumped out and then protected by hydrogen or ammonia decomposition gas. The intake port is equipped with a flowmeter to check the gas input. KPa micrometer is installed on the top of the high temperature box atmosphere furnace to show the pressure in the furnace. A gas collector is installed to check the purity of the gas. The furnace mouth is equipped with exhaust gas outlet and condensate water outlet. All pipelines are centralized, easy to operate, beautiful and generous.

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Vacuum-Sintering-Furnace-with-Nitrogen-Atmosphere

Vacuum-Degreasing-Sintering-Furnace-Heating-Chamber

Vacuum High Pressure Gas Quenching Furnace Structural Characteristics

Vacuum furnace can be divided into different types. Today, we introduce the use and structure characteristics of vacuum high pressure gas quenching furnace.

Usage: Vacuum high pressure gas quenching furnace is mainly used for quenching high speed steel, tool and die steel, stainless steel, solid solution treatment of stainless steel and titanium alloy, vacuum heat treatment of magnetic materials, high temperature brazing and vacuum sintering, and low temperature tempering with convection fan.

Structural features: The heating chamber adopts stainless steel skeleton and new carbon felt composite material, with less deformation, high temperature and pressure resistance, long service life, easy maintenance, graphite tube heater, easy installation and maintenance, and low failure rate.

Air-cooled by jet cooling, graphite nozzle circumferential distribution, so that the high-pressure air flow more reasonable, part of the main air duct air volume can be adjusted, customers can control part of the main air duct air volume according to the characteristics of the workpiece, can effectively control the deformation of the workpiece. High-speed, high-pressure and large-flow fan, copper-copper high-efficiency circular heat exchanger, to achieve high-speed cooling.

The fan can adopt single speed, double speed and variable frequency speed regulation to control the air cooling speed. The heating chamber can also adopt all-metal structure to meet the requirements of solid solution treatment of titanium alloy and precision alloy. The electronic control system adopts the way of PLC and programmable temperature controller, realizes three control modes: automatic, semi-automatic and manual, and has flexible operation.

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1200ºC--Vacuum-Tempering-Furnace

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Vacuum stripping furnace

Vacuum heat treatment process can improve the service life of parts. It is the most advanced heat treatment process in the contemporary era, and has been widely recognized.

The popularization of vacuum furnace came into being under the background of this era. Vacuum furnace is carried out in the vacuum state during the heat treatment of parts, which completely avoids the problem of oxidation. The performance of parts after vacuum heat treatment is more stable and reliable, which provides a guarantee for precision workpiece processing. According to statistics, the service life of parts processed by vacuum furnace is 30% higher than that of parts processed by ordinary process, even several times higher under the condition of similar hardness.

When we use vacuum furnaces, we will also face some problems that heat treatment process can not be completed in vacuum furnaces. There are roughly two reasons. One is that vacuum furnaces manufactured by vacuum furnaces manufacturers according to the standards of vacuum furnaces, although the technical parameters are qualified, heat treatment process is not considered comprehensively and systematically in the process of producing vacuum furnaces, which leads to the following problems. The parameters of vacuum furnace do not match those of heat treatment. Secondly, there are some defects in the vacuum heat treatment process, which can not achieve the desired results.

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3000-Degree-Graphitization-Vacuum-Induction-Furnace

Customized-Vacuum-Degreasing-Sintering-Furnace

Latest Wholesale Price of Vacuum Furnace

The vacuum furnace produced by our company integrates control system and furnace, and has compact and beautiful structure. The furnace lining is made of high purity alumina ceramic fiberboard, which has small heat storage, good heat preservation and energy saving effect, light weight and small space occupation.

The shell adopts double-layer air-cooling structure to ensure that the surface temperature of the shell is close to room temperature. The temperature control system adopts 0.2-level intelligent instrument with industrial precision, PID control and 51-stage programmable automatic control. The vacuum furnace is widely used in Colleges and universities, scientific research institutes and enterprise laboratories. It is an ideal equipment for sintering, melting, analysis and development of metal, non-metal and other compound materials.

Vacuum furnace uses alumina fiber as lining, silicon carbon rod or silicon molybdenum rod as heating element. Distribution of diffusion pump or molecular pump vacuum unit. It is widely used in heat treatment and copper welding of metal materials in high vacuum, reducing and protective atmosphere. Externally closed vacuum tank with water cooling system, the whole machine has novel structure, easy operation and affordable price.

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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. So what are the heat treatment techniques of vacuum furnace and medium frequency furnace?

1. Nitrogen should not be used as cooling gas when titanium alloy is treated in vacuum furnace, because titanium and nitrogen react at high temperature to form golden titanium nitride.

2. All the movable connections of the vacuum furnace are sealed with O-type rubber rings, which are cooled by water.

3. Vacuum quenching oil should be used to quench the workpiece in vacuum, which has lower saturated vapor pressure.

4. Vacuum furnace maintenance should be in the state of vacuum or pure nitrogen, to avoid suction and moisture absorption when not in use at ordinary times.

5. The pressure rise rate of domestic vacuum furnaces should not be less than 1.33Pa/h, and the standard of some foreign enterprises should be 0.67Pa/h.

6. Vacuum heating is mainly radiation, and the workpiece should be kept spacing in the furnace.

7. During the heating process, the workpiece and the material in the furnace will deflate and the vacuum will decrease.

8. The heating temperatures of vacuum tempering, vacuum annealing, vacuum solid solution treatment and vacuum aging are generally the same as those of conventional treatment.

9. Vacuum tempering furnace should have quick cooling device. The pressure of cooling water should be greater than 0.2 Mpa and the flow rate should be adjustable.

10. Cooling gas: steel generally uses 99.995% pure nitrogen, superalloy 99.999% nitrogen or argon, titanium alloy 99.995% argon.

11. Warming up: After putting into the workpiece, it can be heated only when pre-pumped to 6.67 Pa.

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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 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.

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Water-Ring-Vacuum-Pump-Common-Solutions

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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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Vacuum-Induction-Furnace-Characteristics

Hot-Press-Sintering-Furnace-Ceramic-Sintering

Vacuum-Heat-Treatment-Furnace-Price

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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Vacuum-Sintering-Furnace-Purchasing-Guide

Vacuum-annealing-furnace-smelting-high-nitrogen-steel

Large-horizontal-vacuum-annealing-furnace

Vacuum-Furnace-Heating-Chamber

Various vacuum furnace functions

Vacuum furnaces mainly include three types: horizontal vacuum furnace, well vacuum furnace and vacuum sintering furnace. Vacuum furnaces are mainly used for the technical processing of materials under vacuum conditions. These three types of furnaces have their own unique functions.

Horizontal vacuum furnace: Under the vacuum condition, the integrated circuit and power electronic device production line processes the products, such as sintering, alloying, annealing and welding.

Well type vacuum furnace: semiconductor device sintering, sealing and welding, solar cell drying, soldering and metallized shell and other airtight packaging, sintering of glass containers and various parts under the protection of hydrogen and nitrogen.

Vacuum sintering furnace: electronic devices, thyristor modules, thermistors, magnetic materials, ceramic metallization industry in the vacuum environment for sintering, packaging, annealing, welding and other processes.

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Vertical-Induction-Sintering-Furnace

Horizontal-High-Pressure-Sintering-Furnace

vacuum gas quenching furnace Internal structure

The vacuum gas quenching furnace mainframe is a horizontal and double chamber structure. The front chamber of the furnace body is a cooling chamber, the middle is a vacuum sealed and insulated gate valve, the rear chamber is a heating chamber, and the front and rear chambers have a furnace cover.

1. The vacuum gas quenching furnace body and the furnace cover are double-walled water-cooled structures. The inner and outer walls of the furnace are made of carbon steel plate, and the two ends are welded to the flange, and the cooling water is passed through. The intermediate gate valve body is provided with cooling water and is equipped with a high temperature resistant sealing ring. The sealing ring is not baked at a high temperature in the heating chamber with the movement of the valve plate, and has a long service life and is convenient to replace at the same time.

2. The heating chamber (furnace) is composed of a heat insulating layer, a heating element and a material table.

The heat insulation layer is a circular structure composed of graphite fiber felt. The heat insulation layer is fixed on the chamber frame composed of the porous steel mesh and the angle steel ring; the heat insulation layer of the gate valve is fixed on the valve plate and can move with the valve plate.


The heating element adopts a graphite tube, and the heating element is evenly arranged along the circumferential direction of the inner wall of the heat insulating layer, and the furnace temperature is uniform and convenient to replace.

The table consists of a graphite column, a graphite hearth and an AL2O3 spacer on the hearth. This structure prevents the bonding of the tray and the graphite hearth at high temperatures.

3. The plug-in type intermediate gate valve is a composite structure with heat insulation and sealing. The four-bar linkage mechanism makes the heat insulation and vacuum sealing safe and reliable, and the inclined surface guide makes the gate valve operate smoothly and without vibration.

4. The front chamber is a cooling chamber, which can be oil quenched and air cooled. The upper part is a gas quenching chamber equipped with an air cooling system; the lower part is an oil quenching chamber, equipped with a lifting mechanism, an inlet and outlet mechanism, an oil stirring device and an oil heating device.

Air cooling system: The vacuum gas quenching furnace is composed of a high speed fan, a heat exchanger and a flow guiding device. When air-cooled, it is filled with high-purity nitrogen or high-purity argon gas, and a forced convection cycle is formed under the driving of a high-speed fan to achieve rapid air cooling of the workpiece.

Lifting mechanism: driven by a three-speed gear motor outside the vacuum gas quenching furnace, the lifting and lowering truck is driven by a screw and nut mechanism. The lift truck has three speeds, and the slow speed is adopted when feeding the material. When the oil is quenched, the slow start, the fast oil input and the slow speed are used.

Inlet and discharge mechanism: the motor reducer drives the sprocket to drive the chain inside the furnace, and the chain with the tensioning mechanism is equipped with a lever to drive the feeding of the feeding trolley.

Oil mixing system: The motor reducer drives the agitator below the material truck. The deflector can promote the reasonable circulation of the vacuum quenching oil and improve the cooling capacity of the quenching oil. The agitator is a standard part with low noise and high efficiency.

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Vacuum-Annealing-Furnace-Maintenance

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the-principle-of-vacuum-sintering-furnace

what-you-need-to-know-to-operate-vacuum-furnaces

Vacuum Furnace Production Process

Vacuum furnace is a kind of heat treatment method developed with the top industries such as fine machinery manufacturing, aerospace, national defense and so on. Especially in recent years, with the improvement of Parts'function and precision requirements, more and more attention has been paid to the accurate operation of vacuum furnace.

In general metallurgical heat treatment, people have done a lot of work on Modeling and optimization of metallurgical annealing furnace according to the target parameters of hot zone temperature, but because of the different mathematical models and treatment methods, although the necessary optimization effect has been achieved, the accurate control effect of temperature is not ideal. In addition, there are also some related studies and papers published on the modeling and optimization of the target parameters according to the workpiece temperature.

In order to get a better annealing temperature control effect, a more accurate mathematical model is needed to guide the annealing temperature control of vacuum furnace. Through thorough analysis of the working mechanism of vacuum furnace and combining with the actual production process, an optimized model is obtained. This model deals with the time lag of the temperature control of workpiece in the past, which leads to inaccurate operation. The phenomenon of reducing energy consumption and annealing time.

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Vacuum-Tempering-Furnace-of-Operation-Process

How-to-divide-the-insulation-layer-of-vacuum-furnace

Customized-Vacuum-Furnace-Design

How to select high quality vacuum heat treatment furnace

Vacuum heat treatment furnace is an important equipment to realize vacuum heat treatment. Vacuum treatment furnaces are widely used in vacuum tempering, aging, annealing and quenching of structural steels, heat-resistant alloys, precision alloys and materials. They can also be used in vacuum degassing, brazing and sintering.

1. Purchase of furnaces should take into account the universality of the process, i.e. a wide range of quenching and tempering temperatures. Especially, it is very convenient to temper high alloy steel directly without stoving after quenching.

2. Control system is the core part of vacuum heating furnace to ensure its reliability, perfection and importance. It is better to have monitoring and fault display, recording functions for imported equipment need to be equipped with remote monitoring functions so as to ensure the timeliness of fault handling and reduce maintenance costs.

3. The selection of vacuum furnace must satisfy the relationship between metal oxides and carbon monoxide equilibrium decomposition pressure according to the chemical composition and heating temperature of the parts to be heat treated. It should also be considered that not pursuing high vacuum degree will not only cause the volatilization of alloy elements, but also increase the investment cost of equipment configuration.

4. The forms and materials of heating elements in vacuum furnace are different to some extent. Generally, high quality graphite is made of plate and rod materials. The quality of heating elements is related to the heating speed and temperature. When choosing the heating elements, we should choose the high performance configuration as far as possible.

5. The reliability and sealing of vacuum system configuration are also very important. If it is unstable or poor sealing, it is easy to have the situation that the vacuum can not reach. At this time, it is possible to change the color or shape of the workpiece. Therefore, we must pay great attention to this aspect when choosing.

Vacuum-High-Pressure-Gas-Quenching-Furnace

Vacuum-Double-Chamber-Oil-and-Gas-Quenching-Furnace

Vacuum-Tempering-Furnace-for-Alloy-Steel

Vacuum-Annealing-Furnace-for-Soft-Magnetic-Material

Vacuum High Pressure Gas Quenching Furnace

Vacuum annealing furnace: Vacuum annealing furnace can be divided into single chamber, double chamber and vertical type. Vacuum annealing furnace can choose medium and high temperature and low temperature according to the material of parts, (medium and high temperature 800 C~1350 C, low temperature 800 C).

Vacuum high pressure gas quenching furnace is suitable for vacuum heat treatment of high speed steel, stainless steel, die steel and other materials with good hardenability. It is characterized by small deformation of parts and no cleaning after heat treatment. The shortcomings are that quenching gas can not be recovered and the cost is high. Vacuum high pressure gas quenching furnace can be divided into horizontal type and vertical type. Horizontal type can be divided into single room, double room and three rooms. Vertical type is suitable for heat treatment of ring-shaped, cylindrical and long rod-shaped parts. The quenching pressure of vacuum high pressure gas quenching furnace is generally 2B a r~10b a r. According to the user's needs, we can choose the furnace type which is suitable for pressure.

Vertical-High-Pressure-Gas-Quenching-Furnace

Customized-vacuum-annealing-furnace

heat-treatment/vacuum-water-quenching-furnace