Atmospheric Furnace Characteristics

Atmosphere furnace is a high temperature furnace which integrates the double characteristics of box and tube furnace. It is suitable for the experiment and production with large proportion of samples and the requirement of atmosphere. It adds the air inlet and outlet, the furnace body is sealed and welded. There is a ring of high temperature silicone rubber seal at the door of the furnace, and the sealing ring is equipped with water-cooling protection device. So vacuum ventilation atmosphere can be pumped during the test. The vacuum effect can reach 100 Pa.

Resistance furnace of tubular atmosphere furnace mainly uses metallurgical, glass, positive and negative materials of lithium battery, new energy and other materials under certain atmosphere and vacuum conditions. There are single tube, double tube, horizontal, vertical, open, single temperature zone, double temperature zone, three temperature zone, multi-temperature zone and other furnace types. Suitable for heating and sintering of small sample workpiece, with safe and reliable, simple operation, good temperature control **, good heat preservation effect, wide temperature range, high furnace uniformity, multiple temperature zones, optional atmosphere, vacuum furnace type, can compile 31 sections of program, working mode will put the furnace tube into the furnace for heating.

The atmosphere furnace uses silicon-molybdenum rod as heating element and double shell structure. Phase shift trigger and thyristor control. Furnace uses alumina polycrystalline fibre material, double shell is equipped with air cooling system, which can quickly cool down the temperature control system. Furnace uses shell integral seal, cover plate seal, silica gel pad and water cooling system. Gas enters and exits from the back chamber after flowmeter, and there are several inlets for furnace washing. The furnace has the advantages of balanced temperature field, low surface temperature, fast temperature rise and fall, energy saving and so on. It is an ideal product for atmosphere protection sintering and atmosphere reduction in universities, scientific research institutes and industrial and mining enterprises.

Вакуумная печь

VACUUM FURNACE

industrial vacuum pumps,vacuum furnaces

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 stripping furnace

The method of arc heating and smelting metal in vacuum strip-throwing furnace. The electrodes used in this smelting method are self-consuming electrodes and non-self-consuming electrodes.

Consumable electrodes are made of melted materials (i.e. furnace charge), which are gradually consumed in the process of vacuum strip throwing furnace melting, while non-consumable electrodes are made of high melting point materials such as tungsten, which are basically not consumed in the process of furnace charge melting. Vacuum arc furnace with consumable electrodes is called self-consuming electrode arc furnace, which is short for self-consuming electrode arc furnace. Vacuum arc furnace with non-consumable electrodes is called non-consumable electrode arc furnace, which is short for non-consumable electrode arc furnace.

At present, non-consumable electrode smelting has been less used, and consumable electrode smelting has been widely used in production practice, becoming one of the main means of secondary remelting. Crucibles for vacuum arc melting are usually made of copper and cooled by water outside, which is called water-cooled copper crystallizer.

In vacuum strip-throwing furnace, consumable electrodes (melted materials) can be connected with negative electrodes, and water-cooled copper crystals can be connected with positive electrodes. Arc discharge occurs between the two poles after electrification, which converts electric energy into heat energy and produces high temperature to melt materials. In the melting process, the liquid metal droplets fall into the metal melting pool after passing through the high temperature arc zone, and solidify into ingots in the water-cooled copper crystallizer. Through a series of physical and chemical reactions between liquid metal and gas as well as in the molten pool, the purpose of improving the purity of metal and its crystalline structure and properties is achieved.

Vacuum Sintering Furnace

Vacuum Debinding Furnace

Medium Frequency Induction Melting Furnace

The working frequency of IF induction smelting furnace is between 50 Hz and 10 kHz, which needs frequency modulation by frequency converter. Medium frequency induction smelting furnace has more advantages than power frequency induction smelting furnace because of its high electric and thermal efficiency, short smelting time, less power consumption, less land occupation, lower investment, flexible production and easy implementation of process automation. It is suitable for smelting all kinds of cast iron, especially alloy cast iron, nodular cast iron and vermicular cast iron. It has strong adaptability to burden, and the variety and size of burden can be changed in a wide range. Medium frequency induction smelting furnace has the advantages that other iron smelting furnaces do not have, so it has gained remarkable development in recent years, and has been widely used in cast iron production.

With the continuous improvement of power density of medium frequency induction smelting furnace, the requirement of safety, lining life and noise is becoming higher and higher, and the rationality of furnace body structure is becoming more and more important. Heavy steel shell furnace has many advantages such as strong durability, high efficiency and productivity, low noise, easy maintenance and repair.

Heavy-duty steel shell furnace is different from frame furnace. It has a high strength annular steel shell with several large checkpoints. When the furnace is running, the checkpoints are closed and each checkpoint can be opened. The internal structure of heavy-duty steel shell furnace is strong, which can avoid the deformation that may be caused by tapping and pouring, and prolong the service life of furnace lining. Moreover, the sound absorption and isolation material can be added to the enclosed solid steel shell and its interior, which greatly reduces the working noise. The strong steel shell can also effectively protect the induction coil from the danger of splashing metal, so that the furnace has the greatest safety in operation. In order to effectively insulate and heat preservation and prolong the life of lining, cooling rings are installed at the top and bottom of heavy-duty steel shell furnace, which plays the role of uniform lining temperature and reducing thermal expansion. The stainless steel cooling ring with low energy consumption and high strength greatly improves the furnace efficiency.

Lab Vacuum Furnaces

Vacuum Graphitizing Furnace And Carbonization Furnace

Vacuum Quenching Furnace Maintenance

After shutdown of the vacuum quenching furnace, the vacuum in the furnace should be kept below 66.5 LPA.

When the furnace is dusty or unclean, use alcohol or gasoline soaked silk cloth to wipe clean and dry it.

When disassembling and assembling parts such as sealing structure and vacuum system on the furnace body, clean them with alcohol or gasoline and dry them, then coat them with vacuum grease and assemble them.

The outside surface of vacuum quenching furnace is often wiped, and its operation is clean and clean.

Parts and parts trucks need to be cleaned and dried before they can enter the furnace to prevent moisture and dirt from entering the furnace.

When the transmission parts are found to be jammed, inaccurate limit and control failure, they should be queued immediately and not be forced to operate so as to avoid damaging the parts. Aluminum plate spot welding machine mechanical transmission parts should be regularly refuelled or replaced for maintenance.

Vacuum pumps, valves, measuring instruments, thermal instrumentation, electrical components and other accessories are maintained and maintained according to the technical specifications of the products.

Maintenance operation should be carried out in case of power failure. In the case of live maintenance, we must ensure the absolute safety of people and equipment.

Vacuum-Oil-Quenching-Furnace-for-alloy-structure-steel

Titanium-alloy-vacuum-melting-induction-furnace-price

Вакуумная закалка пресс-форма

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

Powder Metallurgy Vacuum Sintering Furnace Heating System

Structure and function of vertical high temperature vacuum sintering furnace system. According to the system requirements and operation process, a distributed and modular DCS control solution is designed. The hardware configuration and software design of the control system are discussed in detail. Real-time monitoring of process operation conditions of production equipment and online real-time display of controlled quantities are realized. The control scheme has the characteristics of simple hardware and flexible configuration, and is suitable for small and medium-sized control systems.

With the continuous development of science and technology, China's industry, national defense, aerospace and other fields have made considerable progress, including the vacuum equipment manufacturing industry, whether equipment level, production process, control technology has also been greatly improved. In addition, the continuous improvement of science and technology has also promoted the continuous development of material field, and some special materials and new materials have been widely used in aviation, aerospace, military industry, energy, chemical industry and other fields. Vacuum heat treatment technology plays an increasingly important role in the production of these special materials and new materials.

In view of the time-varying, large lag and non-linearity of powder metallurgy vacuum sintering furnace, the PID control effect is not ideal, and the fuzzy control algorithm is selected. The simulation models of PID control and fuzzy control are established and compared. The results show that the response speed of the system is very fast, the time to reach steady state is only 3.2 seconds, there is no overshoot, the steady state error is 1.2 C, and the steady state accuracy is very high. The output of the system simulation is close to the given input waveform, and the system regulation time is only 3.2 seconds. In a short time, it quickly enters a stable state, and the oscillation is very small. Fuzzy control is superior to traditional PID control and can meet the temperature control requirements of powder metallurgy vacuum sintering furnace.

Powder metallurgy vacuum sintering furnace is a time-varying, large lag, non-linear heating system. Because of the complexity of its physical and chemical mechanism, there are many influencing factors, so it is difficult to obtain an accurate mathematical model. When the parameters change greatly and the control precision is demanded high, the general PID control effect is very unsatisfactory. Fuzzy control does not require the system to give an accurate mathematical model. According to the actual experience of human beings, control rules are formulated and control decision tables are made. The system is controlled according to decision tables. It is especially suitable for sintering furnace, which is a complex industrial production object. The main factors affecting the quality of products in sintering process are sintering temperature and sintering time. Especially, the requirement of temperature is very strict. The maximum temperature difference is not allowed to exceed the given value of ~3 ~5. Therefore, it must be strictly controlled.

Vertical-High-Pressure-Quenching-Furnace-for-Metal-Parts-Treatment

Reasons-for-oxidation-of-vacuum-brazing-furnace-products

Vacuum-Furnace-in-Nitriding

Low-Pressure-Vacuum-Nitriding-Treatment-of-TC4-Titanium-Alloy

Vacuum Sintering Furnace Technical Index

Vacuum sintering furnace is suitable for high temperature vacuum/atmosphere sintering or vacuum heat treatment of materials. It is used in cemented carbide, magnetic alloy, ceramics and powder materials industry. Mainly using medium frequency induction heating or resistance heating mode, the furnace body under the door or front and back door, hydraulic or electric lifting and discharging, vacuum and heating/cooling process can be fully automatic control.

 vacuum sintering furnace characteristics:

(1) Fully automatic program control and stable operation.

(2) Man-machine interface (optional).

(3) Uniform heating, small workpiece deformation, the highest temperature: 1300 ~1600 ~2000 ~C (optional).

(4) Strong cooling capacity, cooling gas pressure 0.2 MPa, 0.6 MPa, 1.0 MPa (optional).

(5) Energy conservation and no environmental pollution.

(6) A variety of protection functions to make the operation safer.

Multifunctional-NdFeB-vacuum-sintering-furnace

Double-chamber-Horizontal-Oil-Quenching-Gas-Cooled-Vacuum-Furnace

Single-chamber-Horizontal-Hot-Pressing-Sintering-Vacuum-Furnace

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.

Double-chamber-aluminum-brazing-vacuum-furnace

Diamond-vacuum-brazing-furnace-price

Single-chamber-horizontal-Brazing-vacuum-furnace

Vacuum-Brazing-Furnace-for-Vacuum-Cup

Powder metallurgy vacuum sintering furnace

Structure and function of vertical high temperature vacuum sintering furnace system. According to the system requirements and operation process, a distributed and modular DCS control solution is designed. The hardware configuration and software design of the control system are discussed in detail. Real-time monitoring of process operation conditions of production equipment and online real-time display of controlled quantities are realized. The control scheme has the characteristics of simple hardware and flexible configuration, and is suitable for small and medium-sized control systems.

With the continuous development of science and technology, China's industry, national defense, aerospace and other fields have made considerable progress, including the vacuum equipment manufacturing industry, whether equipment level, production process, control technology has also been greatly improved. In addition, the continuous improvement of science and technology has also promoted the continuous development of material field, and some special materials and new materials have been widely used in aviation, aerospace, military industry, energy, chemical industry and other fields. Vacuum heat treatment technology plays an increasingly important role in the production of these special materials and new materials.

In view of the time-varying, large lag and non-linearity of powder metallurgy vacuum sintering furnace, the PID control effect is not ideal, and the fuzzy control algorithm is selected. The simulation models of PID control and fuzzy control are established and compared. The results show that the response speed of the system is very fast, the time to reach steady state is only 3.2 seconds, there is no overshoot, the steady state error is 1.2 C, and the steady state accuracy is very high. The output of the system simulation is close to the given input waveform, and the system regulation time is only 3.2 seconds. In a short time, it quickly enters a stable state, and the oscillation is very small. Fuzzy control is superior to traditional PID control and can meet the temperature control requirements of powder metallurgy vacuum sintering furnace.

Powder metallurgy vacuum sintering furnace is a time-varying, large lag, non-linear heating system. Because of the complexity of its physical and chemical mechanism, there are many influencing factors, so it is difficult to obtain an accurate mathematical model. When the parameters change greatly and the control precision is demanded high, the general PID control effect is very unsatisfactory. Fuzzy control does not require the system to give an accurate mathematical model. According to the actual experience of human beings, control rules are formulated and control decision tables are made. The system is controlled according to decision tables. It is especially suitable for sintering furnace, which is a complex industrial production object. The main factors affecting the quality of products in sintering process are sintering temperature and sintering time. Especially, the requirement of temperature is very strict. The maximum temperature difference is not allowed to exceed the given value of ~3 ~5. Therefore, it must be strictly controlled.

High-Quality-Manganese-Alloy-Melting-Industrial-Electric-Arc-Furnace.

Quality-Vacuum-Induction-Heating-Laboratory-Sintering-Furnace

Vacuum-Atmosphere-Muffle-Furnace-for-Metal-Annealing

Silicon-Carbide-Vacuum-Induction-Heating-Sintering-Furnace

How to install vacuum furnace?

Vacuum furnaces may not be unfamiliar to everyone, but there are many problems about the installation of vacuum furnaces, so how to install the vacuum furnaces is correct? How to use the vacuum furnaces correctly?

1. Attention should be paid to the installation of graphite electrothermal elements and water-cooled electrodes in vacuum furnaces.

 Graphite elements should be handled with great care in case of damage.

The bolts should be tightened reliably in order to achieve good electrical contact. Do not exert too much force to avoid thread breaking.

2. The layout, installation location and civil conditions of the vacuum furnace provided in the reference paper. Select the permanent installation site of equipment and carry out civil construction. Installation site should be free of smoke and dust pollution, clean environment, dry air, should not be put together with other equipment, maintain room temperature of 10-35 C, smooth and clean ground.

3. Connect the pipeline to the refilling pipeline according to the system diagram of the refilling system of vacuum furnace. It is suggested that high purity nitrogen with purity of 99.99%-99.999% be provided as refilling gas.

4. According to the water cooling system diagram, the intake and drainage pipes are connected to the inlet and drainage ports of the furnace respectively, providing water sources with pressure of 0.1-0.15 MPa, temperature of no less than 15 C and no higher than 30 C. It is better to provide circulating water and rust-proof water.

5, the vacuum system is positioned according to the vacuum system diagram, assembled and connected with the furnace body. When assembling, the O-ring is coated with a thin layer of vacuum grease, and the flange is tightened evenly.

6. The furnace body and control box of the vacuum furnace are grounded, and the grounding resistance is less than 4 Euros. The gauge cable of the instrument and the vacuum gauge should also be grounded.

7. Connect the power supply to the corresponding electrical connection according to the electrical wiring diagram, check the voltage of the power supply, connect the control box, the power box and the wire and cable between the furnace body.

8. Provide a pneumatic source with a minimum pressure of 0.5 MPa. Industrial nitrogen can be used. If compressed air is used, self-contained pneumatic "three major components" (such as oil mist, pressure reducer and water separator) will be provided.

9. Install other vacuum furnace components, including conduits, measuring instruments, etc.

Heat-treatment-of-powder-metallurgical-materials

Vacuum-Dryer-for-Thermosensitive-Materials

Carbonitriding-heat-treatment-process.

Heat-Treatment-of-Automotive-Parts

Electric heating elements commonly used in high temperature vacuum furnaces

The common electrothermal elements used in high temperature vacuum furnace are refractory metal electrothermal elements and graphite electrothermal elements.

A. Refractory metal electrothermal elements

There are three shapes of refractory metal electrothermal elements:

(1) Coils or zigzag electrothermal elements made of wire. This kind of electrothermal element is not different from the electrothermal element used in non-vacuum furnace. It is mainly made of molybdenum wire. The coil is generally made of wire with a diameter of 22.5mm. The working temperature of the molybdenum wire electrothermal body does not exceed 1700 C. The zigzag electrothermal elements are made of wires with larger cross-section than coil electrothermal bodies. They require higher strength and require no less than 0.1-100Pa vacuum in the furnace when they are designed.

(2) Fibrous or rod-shaped electrothermal elements. This kind of electrothermal element is used at temperatures below 2300 C. The main material of the electrothermal body is tungsten, and sometimes molybdenum (working temperature is below 1700 C). The two ends of the rod are cast into the copper to form a protruding part, which enables the rod to be fixed. The upper end of each rod is cooled by water through the furnace cover, and the head part is sealed by a metal spring tube. The lower end of the rod is fixed on the water-cooled sector chassis. The electric heater made of tungsten rods is composed of nine rods arranged along the circumference.

The conductor of brazed electrothermal element is water-cooled copper pipe. Brazing is made of wire with diameter of 5 mm. The filamentous electric heater is composed of 12 tungsten brazes, which form a cylindrical heating space arranged along the circumference.

The main drawbacks of brazed and rod-shaped electrothermal elements are that a large number of water-cooled wires in the furnace cause great heat loss; they can not be divided into several heating zones to adjust furnace temperature according to height; generally, only one heating zone can be used in the furnace.

(3) Metal sheet electrothermal elements. Molybdenum or tantalum plates are used as electrothermal materials. Tungsten plate is generally not used because of the difficulties in machining and welding. The electric heater is cylindrical in shape, consisting of three thin plates with 0.2 mm edges. The lower part is fixed on a ring with 2 mm thickness. The upper part of each metal plate is welded (or riveted) with thin strips. The current is transferred from thin strips to the electric heater. These thin strips fix the electric heater on a copper water-cooled wire at the same time. This kind of electrothermal element has the best thermal conductivity because the whole surface participates in the heat exchange of the heated object. The disadvantages of this kind of electrothermal element are basically the same as those of brazed or rod electrothermal elements.

B. Graphite electrothermal elements

In addition to refractory metals, graphite is an electrically heated material comparable to refractory metals for electric heaters in vacuum furnaces. A good property of graphite compared with refractory metals is that its resistance varies little with temperature. Graphite has a high resistance and can use tens of volts of power supply when the section of the electrothermal body is large. Generally, graphite electrothermal elements are used in the vacuum of 0.1-100 Pa, and their service limit temperature is 2200 C. Under the above vacuum conditions, the working life of graphite is only tens of hours at 2300 C, but only a few hours at 2400-2500 C. It is worth pointing out that graphite has good thermal conductivity at low temperature, but at high temperature it decreases to a fraction of that at low temperature, so it will cause the temperature difference between the center and the outer surface of the electrothermal element, which will produce mechanical stress and lead to the damage of the electrothermal element. When designing graphite electrothermal elements, the stress produced by them should be calculated.

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

Customized-Vacuum-Gas-Quenching-Furnace-for-Hardening

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

Vacuum-Oil-Quenching-Pressure-Gas-Quenching-Furnace

Maintenance Method of Vacuum Sintering Furnace

Vacuum sintering furnace is widely used in vacuum sintering treatment of ceramics, silicon carbide, cemented carbide, photoelectric plating material and graphite purification. In order to maintain the vacuum sintering furnace, only good maintenance can be used for a longer time.

1. Cleaning operation of four distribution cabinets.

2. If the mesh belt is a top needle mesh belt, please grind the top needle end with sandpaper to prevent scratches on the battery sheet. If the mesh belt is inclined, it will be baked at low speed at 100 rpm to eradicate organic matter.

3. If the lamp tube is infected with organic matter, please be careful to scrub it with alcohol cotton or non-woven cloth.

4. Cleaning operation inside the cavity (need to pay attention to whether the stomata are blocked or not).

5. Cleaning operations of organic and hot exhaust (including plant operations and equipment, as well as equipment soot box), please use alcohol to clean the organic matter on the equipment, etc.

6. When disassembling and assembling the sealing structure on the furnace body, vacuum system and other parts, clean them with alcohol or gasoline and dry them, then coat them with vacuum grease and assemble them.

7. If there are inaccurate limit, control failure, clamping and other phenomena of transmission parts, they should stop immediately, and do not operate forcibly, so as to avoid damaging the parts.

8. After the shutdown of the vacuum sintering furnace, the vacuum in the furnace must be kept below 66.5 LPA.

9. Vacuum pumps, valves, measuring instruments, thermal instruments, electrical components and other accessories must be used, maintained and maintained in accordance with the technical specifications of the products.

10. Maintenance operation should be carried out without power supply. If it is maintained under live condition, it must be maintained by professional maintenance personnel, while ensuring the absolute safety of people and equipment.

11. Mechanical transmission parts of spot welding machine for aluminium plate in vacuum sintering furnace should be regularly refuelled or replaced for maintenance.


China-Mini-High-Temperature-Heat-Treatment-Vacuum-Furnaces

Vacuum-Induction-Heat-Treatment-Graphitization-Furnace

Vacuum-Medium-Frequency-Induction-Melting-Furnace

Carbon-Material-Vacuum-Heat-Treatment-Resistance-Furnace

Vacuum Hot Press Furnace System Structure

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.

Vacuum-Sintering-Furnace-for-Large-Parts

Heat-treatment-process-of-aluminium-alloy

Heat-Treatment-Technology-of-Vacuum-Furnace-Casting-Mould

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.

Vacuum-Brazing-Furnace-for-hardening-tool-steel

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.

Vacuum-sintering-furnace-in-powder-metallurgy

Vacuum-Decarbonization-in-Vacuum-Furnace

Deep-decarbonization-of-vacuum-furnace

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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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.

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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 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