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.

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VACUUM FURNACE

industrial vacuum pumps,vacuum furnaces

Design Requirements of Industrial Furnace

The design or modification of industrial furnaces should select the right type structure and new energy-saving materials to increase mechanization and energy utilization as far as possible according to production requirements.

1. The part of uniform heat transfer effect with circular furnace instead of box furnace can strengthen the premise of using reasonable fireplace and increasing the space volume of heat exchanger with workpiece surface without increasing. As a result of reducing the heat loss of the outer wall round furnace and the furnace wall, the heat loss is reduced accordingly.

2. Use high-speed burner or installation in furnace fan to improve convective heat transfer in furnace. Especially the small high-speed air flow destroys the heat and mass transfer of the heater which is stagnated on the surface, and the lower boundary of the interface reaction gas shortens the heating time, and accelerates the function of increasing the temperature of the workpiece.

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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

Safety Characteristics of Vacuum Furnace

Vacuum furnace heat treatment is a comprehensive technology combining vacuum technology and heat treatment. It refers to all and part of the heat treatment process carried out in vacuum. China divides vacuum into low, medium, high and ultra-high vacuum. At present, the working vacuum of most vacuum heat treatment furnaces ranges from 1.33 to 1.33 x 10 Pa.

Vacuum heat treatment can achieve 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 heat treatment 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 has the function of 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. This series of advantages, the development of vacuum heat treatment equipment and process has been more and more attention and application.

Vacuum Brazing Furnace

Vacuum Induction Melting Furnaces

Production and Operation Flow of Vacuum Furnace

Work in the production workshop needs to be done with great care. A little carelessness will have inestimable consequences for life and safety. Especially in industrial production, we all know that Luoyang Kiln Factory is a big factory. The teachers in the experimental electric furnace, high temperature electric furnace, tubular furnace and vacuum furnace are trained and possessed before they go on duty. Certain experience shows the rigor of the production process, so what can be done to minimize the danger point in the specific operation of the vacuum furnace?

Every master of vacuum furnace knows how to start the power supply of vacuum furnace and set the switch of control cabinet at the position of automatic control. The parameters of the vacuum furnace process regulations are input into the computer. The workpiece is then smoothly fed into the furnace with a loading trolley, and the door (cover) is closed and locked to ensure sealing.

The cooling medium, cooling mode and pressure of vacuum furnace should be selected according to the technological requirements. Press the cycle start button, and the equipment executes the program: vacuum heating cooling is automatically completed. Remember to always check whether the equipment system is working properly, and report any abnormalities to the foreman in time. Before discharging, the normal pressure in the furnace should be restored, and the door (cover) should be opened after the indicator lamp is normal. When discharging, careful operation should be taken. No workpiece or tooling should collide with the furnace mouth.

Vacuum Debinding & Sintering Furnace

Vacuum Heat Treatment Furnaces

Vacuum Steam 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 vacuum bright gas quenching, annealing and magnetic materials for high precision parts of alloy materials such as high speed steel, die steel, stainless steel, alloy steel and titanium alloy. Sintering and rapid cooling of materials.

Equipment characteristics of vacuum quenching furnace:

(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 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.

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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.

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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.

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