Vacuum Annealing Furnace Characteristics

Vacuum annealing furnace is composed of two fixed hearth and a fixed furnace body at one end of 14 meters and a movable heating cover. The fixed hearth bears the vacuum muffle tank. The workpiece is heated in the vacuum muffle tank. The furnace temperature uniformity is higher (< 10 C); the all-fiber energy-saving lining can save more than 30% energy compared with the composite brick lining.

The movable hood is equipped with one end and vacuum muffle tank sealed fixed furnace door, the fixed furnace body is equipped with one end and vacuum muffle tank sealed fixed furnace door, the other end is open type, and has a sealing device, so that when combined with the movable hood and the furnace mouth are sealed firmly and reliably and naturally sealed. The side knife type soft seal is used between the hearth and the hood. The side knife of the hearth is inserted into the fiber of the hood when the hood enters the furnace, which makes the sealing between the hearth and the outside of the furnace adiabatic and simple and reliable. Roller grooves are arranged on the load-bearing base of muffle tank, and load-bearing rollers are placed in the groove, so that the muffle tank can move forward and backward freely when it expands and contracts.

A strong cooling fan and pipeline are installed at the end of the hearth, which can speed up the cooling speed after the heating process of muffle tank and improve the utilization rate of the furnace. Intelligent temperature program control system with high precision adopts Fuji high precision PID intelligent temperature control instrument. The program of heating and insulation can be set by itself, and the working condition of each zone can be controlled automatically by program. The temperature record adopts medium and long drawing with paper recorder, which can record the working condition of each zone of the furnace synchronously. This type has intuition. The temperature measurement and control points are set at the bottom and top of the furnace to control the furnace temperature balance within the allowable range, reduce the deformation of muffle tank during heating and cooling, prolong the service life of muffle tank and facilitate operation. The equipment has high degree of automation, safe and reliable operation, long service life and convenient operation and maintenance.

Sintering-of-Metal-Powder-in-Vacuum-Furnace

Vacuum-Arc-Furnace-for-Bearing-Steel-Smelting

Промышленные вакуумные печи

Aluminium vacuum brazing furnace

The structure of aluminium vacuum brazing furnace should be advanced and reasonable. The heating elements should be uniformly arranged along the circumference of the heating chamber at 360 degrees, and the temperature uniformity is high. High-power and high-speed vacuum unit should be adopted. The vacuum recovery time is short.

Zonal temperature control, small workpiece deformation, high production efficiency. The utility model has the advantages of low cost, stable and reliable mechanical action, simple operation and flexible input of programming process. Manual/semi-automatic/automatic control, automatic alarm/display of faults. It can meet the requirements of vacuum brazing and quenching of the typical parts provided by users.

The aluminium vacuum brazing furnace should have reliable automatic control, monitoring, tracking and self-diagnosis functions at the international advanced level. Furnace supporting products and functional components have advanced international level, and can meet long-term, stable and reliable production needs. The energy-saving effect of the equipment is good.

Vacuum-Oil-Quenching-Furnace-for-hardening

alloy-steel-oil-quenching-gas-cooling-vacuum-furnace

Small-Double-Chamber-Vacuum-Oil-Quenching-Furnace

Vacuum-Oil-Quenching-Furnace-for-Precision-Alloy-Steel

Vacuum Brazing Furnace Type Characteristics

1) Hot fireplace

Brazing furnace adopts the form of separate vacuum chamber and heater, commonly known as hot fireplace. It is characterized by pumping air out of the container with brazing parts at room temperature, then pushing the container into the furnace. When brazing parts are heated in the furnace, vacuum pumping and heating are carried out simultaneously. After brazing, the container can be cooled out of the furnace, which shortens the production cycle and prevents the grain growth of the base metal. Vacuum brazing in hot wall furnace mostly requires vacuum pump to work continuously in the whole thermal cycle. To remove the gas released from the working load. In terms of size and maximum heating temperature, the hot-wall vacuum furnace is limited by the ability to withstand high pressure at brazing temperature.

The service temperature of this type of brazing furnace can be as high as 1150 C, which is limited to 870 C or lower in most cases. Heating furnace can use ordinary industrial electric furnace. This kind of vacuum vessel has no heating original parts and heat insulation materials. It is not only simple in structure and easy to operate, but also releases less gas during heating, which is conducive to maintaining vacuum. In order to improve productivity, several brazing containers are equipped to braze and cool the furnace gallbladder alternately. Therefore, equipment investment is low and productivity is high. However, the container is easily deformed under the action of external atmospheric pressure under high temperature and vacuum conditions, so it is suitable for small-scale production. The double container structure is often used in large-scale hot fireplace. The shell of the furnace is also designed as a low vacuum vessel, but its application is limited by the complexity of the structure.

2) Cold fireplace

Vacuum chamber is built in heating chamber, that is, heating furnace and vacuum brazing chamber are integrated, commonly known as cold fireplace. With this type of brazing furnace, the brazing parts must be cooled with the furnace after brazing, which limits the productivity. Thermal insulation materials and electric heating elements are included. Vacuum chambers are usually water-cooled. In order to concentrate the radiation heat on the workpiece and prevent the heat from dissipating to the furnace wall. A suitable heat shield (usually made of multi-layer molybdenum, tungsten, silver, graphite or other high temperature materials) is placed between the heating element and the furnace wall. The temperature can be as high as 2200 C and the pressure can be lower than 1.35 *10-4Pa.

Another type of cold-wall vacuum furnace has a double-layer water-cooling structure. Built-in heat reflecting screen, it is composed of thin metal plate with smooth multi-layer surface. According to the different temperature of furnace, molybdenum or stainless steel sheet is selected. Its function is to prevent heat from radiating outward, reduce heating of furnace shell and improve heating efficiency. Heating elements are distributed inside the reflecting screen, and different heaters are selected according to the rated temperature of the furnace.

When the cold hearth furnace is working, the temperature of the shell is not high because of water cooling and shielding by reflecting screen. It can withstand the external atmospheric pressure well, so it is suitable for high temperature brazing of large weldments. Its heating efficiency is also high, but it needs to be vacuum reheated before use. After brazing, the welding pieces can only be cooled with the furnace, and the temperature of the furnace decreases slowly in the low temperature stage, so the productivity is low. However, if two or more chambers continuous cold hearth furnace is adopted, the vacuum degree of heating chamber is not destroyed, and the filling, brazing, cooling and discharging of welding parts can be operated continuously, and the productivity can be improved.

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Diamond-vacuum-brazing-furnace-price

Single-chamber-horizontal-Brazing-vacuum-furnace

Vacuum-Brazing-Furnace-for-Vacuum-Cup

Diffusion Welding Equipment Composition and Structure

The main and secondary factors of vacuum diffusion welding and LF21 are heat preservation time, heating temperature and applied load in turn. The level is heat preservation time 60 min, heating temperature 540 C and applied load 4 MPa. At this time, the strength of welded joint is very high. The diffusion rate of copper is relatively faster than that of aluminium. The diffusion zone basically distributes on the interface of aluminium side. The hardness of the diffusion zone is much higher than that of the base metal. The intermetallic compound CuAl2 was formed at the interface between diffusion zone and copper matrix of the Cu/Al joint, and the eutectic of alpha(A1)+CuA12 was formed at the interface between diffusion zone and aluminum matrix. The metallurgical bonding of copper and aluminium was realized in the diffusion zone.

Polymer diffusion welding equipment is a kind of welding equipment, which joins copper and aluminium weldments tightly at a certain temperature and pressure for a period of time, and makes atoms between the contact surfaces diffuse to form a joint. The main factors affecting diffusion welding process and joint quality are temperature, pressure, diffusion time and surface smoothness.

Diffusion welding has the advantages of no solder, traceless welding, smooth workpiece appearance. The equipment can adjust the output current and pressure, so that the workpiece can get a reasonable heating speed. The workpiece clamping mechanism adopts oil pressure control system, which makes the clamping of the workpiece stable and stable.

The main function of the polymer diffusion welding machine is to realize the diffusion welding between materials and molecules. The equipment mainly produces electric power, chemical industry, smelting and other industries. It can produce bus expansion joints and soft-connected conductive belt products urgently needed by the industry. It can realize the diffusion welding between soft bus, soft bus and hard bus and hard bus. Diffusion welding.

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High-Temperature-Vacuum-Furnace-Manufacturer

High-Temperature-Vacuum-Diffusion-Welding-Molding-Machine

Low-temperature-tempering-process

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

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

Technical Process of Read Vacuum Brazing Furnace Products

Vacuum brazing belongs to solid phase bonding, which is different from the melting method. The base metal does not melt during vacuum brazing. Because the brazing metal with lower melting temperature than the base metal is used, the heating temperature in the heating chamber of the vacuum brazing furnace is a connection method which is lower than the solid phase of the base metal and higher than the thick wire of the brazing fluid.

Vacuum brazing furnace is to coat the welded parts of the cleaned and decontaminated workpieces with flux, lay the solder on another part which needs to be welded, and also coat the welding surface with flux. After fixing the two parts, the vacuum brazing furnace will be heated to the temperature of solder melting to complete the welding.

It uses the furnace temperature to raise the temperature of the workpiece, and melts the solder whose melting temperature is lower than that of the workpiece, so that the workpiece can be welded.

In this process, heating should be as slow as possible to keep the internal and external temperatures of the products to be brazed consistent, otherwise the brazing quality will be directly affected.

Preheating, heat preservation, energy storage, heat preservation, brazing, heat preservation and power cut in industrial production are effective technological processes that can not only achieve the above objectives but also improve production efficiency. Vacuum brazing temperature and holding time are the key factors affecting brazing quality.

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China-three-chamber-horizontal-high-temperature-Brazing-vacuum-furnace

high-vacuum-brazing-furnace-for-alloy-brazing

Bearing-steel-parts-brazing-furnace-vacuum-furnace

Vacuum Brazing Furnace Knowledge

Vacuum brazing refers to the heating of workpiece in vacuum chamber, which is mainly used for welding products with high quality and oxidizable materials. Vacuum brazing furnace is a protective sintering furnace for heated articles 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 sinter the heated articles protectively. It can be divided into power frequency, intermediate frequency and high frequency. It can be classified as vacuum brazing furnace, including vacuum brazing with circular vacuum, which is mainly used in vacuum brazing of aluminium plate-fin heat exchanger, air conditioning evaporator, automobile heat exchanger, radar grid antenna and waveguide tube. It can be used for ageing and annealing of some nonferrous metals.

The size and position of the cylinder side wall and the pressure vessel of the door are designed to close one end of the cylinder side wall. The workpiece processing system is installed on the pressure vessel door to support the metal workpiece for heat treatment or brazing. The workpiece processing system includes a device that rotates the workpiece during processing. The vacuum system can be connected to the workpiece so that the internal pressure of the workpiece is lower than the atmospheric pressure during brazing. In view of the large-scale development of this kind of products, there are super-large and super-long furnace types to choose from, and equipped with a safe and reliable feeding and discharging truck system.

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Vacuum-Decarbonization-in-Vacuum-Furnace

Deep-decarbonization-of-vacuum-furnace

Development of Automatic Control System for Vacuum Furnace

Vacuum furnace is the main energy-consuming equipment in our production and life. According to the international advanced level, the utilization rate of energy in our country is very low, and the potential of energy saving is great. In order to make the temperature precision reach (+1 C), the control process of charging, pressurizing and solenoid valve required by mechanical action and heat treatment process of vacuum furnace can be automatically controlled with programmable logic controller (PLC), which greatly improves the reliability of the system and guarantees the heat treatment quality of the workpiece. SHlMADEN of Japan has recently developed a programmable vacuum furnace temperature controller FP-21, which inputs heat treatment temperature control curve and programmable parameters into the regulator. With its fast, intuitive and rich on-site working interface, the whole process of on-site furnace temperature control can be realized through the combination of different functions. Actual operation has good regulation effect, guarantees the accuracy of temperature control in each temperature section, realizes the automatic process control of vacuum furnace temperature, and greatly improves the heat treatment quality of precision mechanical parts.

In a word, the introduction of automatic control in vacuum furnace control system not only improves the welding quality and work efficiency of vacuum brazing, but also improves the economic efficiency of the system, and realizes the energy saving and sustainable development of the system.

The control principle is that the temperature signal is supplied to the regulator by the temperature detection element. The regulator sets parameters according to the programmable temperature control curve, carries out PID self-tuning in different time periods, and sends out control signals to the actuator thyristor power regulator. By adjusting the power of the electric furnace wire, the automatic control of the furnace temperature is realized. Because of the flexible curve programming function of the programmable regulator, the furnace temperature can be controlled in the whole process by choosing suitable parameters of the programming curve.

Vacuum-Furnace-Melting-of-Nickel-and-Its-Alloys

Vacuum-Induction-Melting-of-Industrial-Polycrystalline-Silicon

Vacuum-High-Pressure-Gas-cooled-Quenching-Technology

Cooling System of Vacuum Furnace

What is the importance of the cooling system of the vacuum furnace?

Vacuum furnace refers to an industrial furnace heated by electrothermal elements in the near vacuum state. The cooling system of vacuum furnace is an important part of vacuum furnace. Cooling water should be kept clear, otherwise the water temperature will rise and cause shutdown. This is often neglected in the operation of vacuum furnaces. When unmanned, it may lead to significant destruction of vacuum furnaces.

The molybdenum heater in vacuum furnace will harden, shrink, fall, first fall over, then melt. In order to prevent hardening, collapse or sagging of vacuum furnace heating wire at high temperature, the structural dimensions of vacuum furnace heating wire, such as spiral resistance wire, bending diameter of heating element, pitch and spiral diameter, should be designed first. The heater is about to loosen by vacuum furnace insulation lining. 95 ceramics are put on the insulation lining, leaving proper expansion space. The shelf position should be suitable, usually 100 to 200 mm, and can be firmly hooked to prevent the resistance wire from lying on. In addition, direct contact (short circuit) between the furnace wires should be avoided, and isolators should generally be gasketed.

The purpose of treating cooling water by chemical assistant method of biodegradation is to keep minerals in suspension state and reduce the accumulation of sediments in rubber pipes, snake pipes and water jackets so as to make the water flow smoothly. This is usually accomplished by an automatic device, which can monitor the conductivity of water, automatically supplement chemicals, flush water and add fresh water. With the auxiliary steam filtration system, this method can also ensure the pH control of water and prevent the deposition of excess minerals in the cooling water system. After the system is stable, water quality tests should be conducted at least once a month to prevent overtreatment or inappropriate treatment.

The test samples of vacuum tempering furnace shell and heat exchanger material should also be placed in the water system, and the weight loss test should be done once a year to check the treatment effect. Special attention must be paid to the serpentine tube cooler of the diffusion pump. They should be checked regularly. If blocked, the diffuser pump will overheat and lose its function, and further cause the diffuser heater to burn down, resulting in expensive and time-consuming repair. When the serpentine cooling pipe is blocked, the water channel is disconnected from the water source, and the drainage is blown through with compressed air or washed with dilute acetic acid solution.

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Heat-Treatment-Technology-of-Dies-and-Moulds

Low-Tempering-Process

Vacuum-Tempering-Furnace-Classification

How to Control the Temperature of Vacuum Furnace

The temperature control system of vacuum furnace adopts an intelligent temperature control instrument with temperature control accuracy of 0.1%. According to the product process curve, a computer control program is compiled to control the temperature rise, heat preservation, cooling process and the operation of the temperature control instrument of the vacuum furnace. The automatic control of the vacuum furnace by the PC is stopped and the technical requirements of the temperature control of the process curve are realized.

Temperature control system can be set and stored, and each curve can be divided into multiple sections. Each temperature control curve has optional PID parameters and self-tuning function to ensure that there is no overshoot in the heating process. The system is suitable for multiple indexing thermocouples and pre-set heating and insulation curves.

The temperature controller outputs 4-20 mA current signal to the trigger unit, which converts the current signal into voltage signal. The output of the trigger unit controls the DC voltage and current of the excitation circuit, thus controlling the voltage and current of the electromagnetic regulation, and ensuring the vacuum furnace to be heated and kept warm according to the set curve. To complete temperature control, temperature sensing and control technology under vacuum is one of the key technologies of vacuum heat treatment process and equipment. The process of using vacuum furnace must be well mastered.

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Vacuum-Furnace-for-Metal-Smelting

Ultra-high-Temperature-Heating-Elements-in-Vacuum-Furnace

Vacuum Furnace Five Advantages

Vacuum furnace protects the workpiece from oxidizing decarbonization, protects the oxidizable heating elements, reduces the gas content inside the workpiece, and adds more oxidizable elements to the melted metal. Vacuum furnaces have five advantages:

1. The oxidation and decarbonization of the workpiece surface during heating are completely eliminated, and the clean surface without deterioration layer can be obtained. This is of great importance to the improvement of the cutting performance of tools that only grind one side when grinding, such as twist drill grinding, which directly exposes the decarburized layer on the groove surface to the edge.

2. It does not pollute the environment and does not need to dispose of the three wastes. Double-chamber vacuum oil quenching furnace

3. The accuracy of furnace temperature measurement and monitoring has been greatly improved. The temperature difference between the thermocouple and the furnace temperature has reached (+) 1.5 (?) C. However, the temperature difference between different parts of a large number of workpieces in the furnace is large. If the forced circulation of rarefied gas is adopted, the temperature difference can still be controlled within (?) 5 (?) C.

4. High degree of mechatronics. On the basis of improving the accuracy of temperature measurement and control, workpiece movement, air pressure regulation and power regulation can be programmed in advance, and quenching and tempering can be carried out step by step.

5. Energy consumption is significantly lower than that of salt bath furnace. Modern advanced vacuum furnace heating chamber uses high-quality insulation material to make insulation wall and barrier, which can highly concentrate the electric heating energy in the heating chamber, and the energy saving effect is remarkable.


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Medium-Frequency-Iron-Induction-Melting-Furnace

Medium-Frequency-Iron-Induction-Melting-Furnace

500kg-Induction-Melting-Furnace

Medium-Frequency-Small-Vacuum-Induction-Melter-Furnace

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

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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.

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

Vacuum-Varying-Pressure-Nitriding-Furnace

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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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

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Large-horizontal-vacuum-annealing-furnace

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Diffusion furnace process characteristics

Diffusion furnace is one of the process equipment for the development of semiconductor devices such as transistors, thyristors and integrated circuits. It is mainly used in processes such as diffusion and oxidation.

The diffusion furnace is mainly composed of a control part, a purification part, a resistance heating furnace department, and a gas path part. The control part mainly controls the inlet and outlet, and the resistance heating furnace mainly controls the temperature part of the diffusion furnace, and the gas path mainly controls the flow rate of the diffusion source and the discharge amount of the exhaust gas.

The process control software of the diffusion furnace is used by pressing the "power on" button, starting the computer, and double-clicking the "diffusion monitoring system" icon to start the process control software. Enter your username and password to log in.

The temperature setting of the diffusion furnace mainly consists of three analog temperature controller patterns on the interface, corresponding to the three-stage temperature controller of the diffusion furnace.

The diffusion furnace is an electric resistance furnace that automatically controls the temperature. It consists of a temperature controller, a thyristor device and a furnace body. The furnace body is composed of a heat insulating material, a heating wire and a furnace tube. The temperature controller can control the device to automatically control the furnace temperature to keep the furnace temperature stable and uniform to meet the process requirements.

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Diffusion Welding Equipment Welding Method

The temperature of diffusion welding equipment is an important welding parameter of diffusion welding. In a certain temperature range, the diffusion process accelerates with the increase of temperature, and the strength of the joint increases accordingly. However, the increase of temperature is limited by the conditions of high temperature strength of fixture, phase transformation and recrystallization of welding parts, and the temperature is higher than a certain value.

It has little effect on the quality of the joint. Therefore, the heating temperature of solid phase diffusion welding of most metal materials is set at 0.6 - 0.8 Tm (K), in which Tm is the melting point of base metal. Diffusion time, heat preservation and diffusion time are not independent variables, but closely related to temperature and pressure, and can vary in a wide range.

At higher temperatures and pressures, it takes only a few minutes; on the contrary, it takes hours. Diffusion welding with intermediate layer also depends on the thickness of intermediate layer and the requirement of joint composition and uniformity of structure. Higher pressure leads to higher quality joints, and the relationship between joint strength and pressure. When the grain size or surface roughness of the weldment is larger, the pressure required is also higher.

The upper limit of pressure is limited by the total deformation of the weldment and the capacity of the equipment. In addition to thermal isostatic pressure diffusion welding, it is usually 0.5-50 MPa. Welding is a kind of welding method which has been developed early and is still widely used in various arc welding methods. The arc burns between the end of the electrode and the surface of the welded workpiece.

Coatings under the action of arc heat can produce gas to protect arc on the one hand, on the other hand, slag can be produced to cover the surface of molten pool to prevent the interaction between molten metal and surrounding gas. The more important role of slag is to produce physical and chemical reactions with molten metal or to add alloying elements to improve the properties of weld metal.

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Применение печи и операция

Как хорошо установить вакуумную печь для спекания под давлением

Vacuum Brazing Furnace Operation

1. Ensure the operation of water, electricity and gas before the start-up of the vacuum furnace. Voltage at 380V, no deviation of 10%. The air pressure is 0.6 Mpa and the water pressure reaches the lowest value (0.5 MPa). Only when the above requirements are met can the power be switched on and operated.

2. Before discharging, check the equipment heating room. It is necessary for the heating room to be clean. No sundries, dust, oil, water, etc. In view of the goods placed, the same dry cleaning, no water stains, oil stains, etc. before discharging the material to be cleaned.High-Temperature-Vacuum-Furnace-for-Powder-Metallurgy-Sintering

3. After loading, push the knob to the "door" position. Then, start the "mechanical pump" and "rough pump valve". For the vacuum unit and the furnace, turn on the power supply of the vacuum furnace together (in general, the power supply of the vacuum meter starts with the total power supply).

4. When the vacuum degree is higher than 1000Pa, the vacuum gauge monitoring point "J2" lights up. At this time, the Roots pump can be opened. If the condition is not reached, the Roots pump will not be opened and the button will not respond.

5. When the vacuum degree is higher than 7Pa, the vacuum gauge monitoring point "J1" lights up. At this time, open the "front valve" and "decentralized pump". Pre-heating of "Dispersion Pump"hot-sale-Small-lab-vacuum-muffle-furnace

6. When the preheating time of the "distributed pump" reaches 90 minutes (the counter on the touch screen can be investigated), close the "rough suction valve", turn over the "high valve" and pump high vacuum into the furnace.

7. When the furnace vacuum reaches the operating vacuum (the vacuum gauge monitoring point "J3" lights up, pay attention to the initial monitoring point set higher, can set or reach the required vacuum, open heating by itself), open heating, and actively start operation with the temperature control meter (heating curve needs to be prepared beforehand).Vacuum-Diamond-Brazing-Furnace-for-Direct-Sale-Factory