vacuum equipment

Heat treatment vacuum furnace is a comprehensive technology combining the two specialties of vacuum technology and heat treatment, which means that all and part of the heat treatment process are carried out under the vacuum state. China divides vacuum into low, medium, high and ultra high vacuum. At present, the working vacuum degree of most heat treatment vacuum furnaces is ~1.33 10 ³. Pa. The vacuum furnace for heat treatment can realize almost all heat treatment processes, such as quenching, annealing, tempering, carburizing and nitriding, and can realize gas quenching, oil quenching, nitrate quenching and water quenching in the quenching process, as well as vacuum brazing, sintering and surface treatment. Heat treatment vacuum furnace high thermal efficiency, can achieve rapid temperature rise and drop, can achieve no oxidation, no decarburization, no carburization, can remove the workpiece surface phosphorus chips, and have degreasing degassing, so as to achieve the effect of

The pressure in the chamber of a vacuum furnace can be pumped into an industrial furnace below atmospheric pressure. Vacuum furnace is electrically heated, the surface of the workpiece heated is not oxidized, decarbonized, small deformation and good mechanical properties. It is advantageous to remove impurities by smelting metal in vacuum furnace. The finished product has fewer pinholes, smaller segregation and good quality. Vacuum furnaces are suitable for the smelting and heating of high quality, high purity and refractory metals, such as tungsten, molybdenum, tantalum, niobium, titanium, heat resistant alloy steels and magnetic materials, electrical materials, high strength steels, stainless steel, tool steels, die steels, etc. Vacuum furnaces appeared around the 1930s. In 1927, the vacuum annealing furnace for electrical materials was made in the United States. In 1953, vacuum consumable arc furnace was used to smelt titanium sponge in industry. Vacuum induction furnaces have be

The vacuum sintering of cemented carbide has strict requirements on temperature. The temperature rise rate of each heating stage should not be too fast, otherwise it will cause cracks and deformation of the product. If the degumming temperature is too high, the degumming will be too fast, and bubbles will be formed. The degumming temperature will be too low. The degumming is not complete; the deoxidation temperature is too high, and it is easy to form cobalt aggregation and surface "bubbling", and the deoxidation temperature is too low, which may cause deoxidation to be incomplete within a predetermined time. Too low or too high a sintering temperature will deteriorate the toughness of the product and reduce the coercive force. In order to ensure the quality of the product, the cemented carbide sintering process requires that the pre-burning temperature and the following temperature tracking error not exceed ± 50 ° C, the temperature overshoot does not exceed 35 ° C; the s

High temperature furnace, as the name suggests is a very high temperature electric furnace, the highest can reach more than 1800 degrees, so a friend will ask, so high temperature electric furnace, operation will not accidentally encounter furnace shell burns? Because the operation will inevitably touch. So small make up tell you: will never be scalded. Taking the high temperature furnace products of our company as an example, our high temperature furnace has the following three safety requirements: 1, the use of three layers of insulation, respectively: aluminum silicate fiberboard, aluminum oxide fiberboard, aluminum oxide (polycrystalline) fiberboard, not only good insulation effect, and energy saving effect is more than 80% of the old electric furnace. And long-term use of furnace, shell temperature is less than 45 degrees, the temperature will not produce burns to the human body. 2. The closed-loop technology thyristor module is adopted for trigger control, and the phase-shifti

The nitriding furnace is an energy-saving cycle operating furnace. It is mainly used for gas nitriding treatment of various steel machinery parts, steam machinery parts, automobile crankshafts, automobile piston rings, motorcycle brake pads and mold pieces. The structure of the nitriding furnace is mainly composed of a furnace body, a heating element and a temperature control system. The shell of the furnace body is welded by steel and steel plates, and the interior is made of ultra-light high-alloy foam bricks to form a furnace (or a full-fiber cotton structure). The insulation layer is made of aluminum silicate refractory fiber and diatomaceous earth (or vermiculite powder). The bulk material structure is used to improve the heat preservation performance of the furnace body, and the heating element is placed on the wire brick and has a small wire hook for positioning. A heat-resistant plate is welded into the furnace and the basket, and the processed workpiece is placed in the bas

In the processing and production of vacuum heat treatment, the surface of the processed product often has problems in "coloring". Obtaining a bright, non-colored product processing effect is a common goal pursued by manufacturers and users of vacuum furnaces. So what is the reason that affects the brightness? What factors are related to it? How can the product be bright? This is another issue that is of great concern to frontline technicians and workers. The coloring is caused by oxidation, and the different colors are related to the temperature generated and the thickness of the oxide film. Quenching in oil at 1200 °C will also cause surface carburization and melting. If the vacuum is too high, it will cause the elements to volatilize and bond; these will damage the surface brightness. In order to obtain a better bright surface, the measures to be taken into consideration and considered in production practice are as follows: 1 First, the technical sp

Хотя уголь по-прежнему является основным источником энергии в Китае на этапе пропорциональности, промышленные печи не только сильно загрязнены, но и невыгодно применяют высокотемпературную технологию сжигания воздуха. Поэтому замена угля и других видов твердого топлива нефтью и газом является стратегическим направлением энергосберегающего развития промышленных печей в Китае. Дальнейшее развитие и совершенствование технологии сгорания предшественников Мы будем совершенствовать и продвигать высокотемпературную технологию сжигания воздуха или направление энергосберегающего развития промышленных печей в будущем. Технология повышения температуры печи на основе высокотемпературного и высокоэффективного пламени, технология равномерного распределения температуры в печи и технология контроля N0x являются основными технологиями, способствующими сжиганию кислородного топлива, а также будущим направлением развития. В то же время вопросы сокращения выбросов CO2 и их хранения станут

Although coal is still the main energy source in our country in the proportionate stage, industrial furnaces are not only polluted severely, but also disadvantageous to implement high temperature air combustion technology. Therefore, replacing coal and other solid fuels with oil and gas is the strategic direction of energy-saving development of industrial furnaces in China. Further development and improvement of combustion technology of predecessors It is also the direction of energy-saving development of industrial furnaces to improve and popularize high temperature air combustion technology. On the basis of guaranteeing high temperature and high efficiency flame, technology of improving furnace temperature, technology of making furnace temperature average distribution, and N0x control technology are the core technology to promote oxygen-enriched combustion, and also the future development direction. At the same time, the emission reduction and storage of C02 will beco

The service temperature of gray cast iron is generally below 300 C. It is used for furnace components whose tensile strength is less than 400 MPa and which do not bear impact load. From room temperature to 400 C, its mechanical properties have little change. Its tensile strength decreases slightly between 150 200 C, then rises again, and decreases significantly above 400 C. Ductile iron is generally used at temperatures below 370 C for furnace components requiring higher strength and fatigue limit and bearing a certain impact load. The main requirement for heat-resistant cast iron is heat resistance, i.e. oxidation resistance, growth resistance, high strength, hardness and creep resistance at high temperature, with emphasis on oxidation resistance and growth resistance. The heat-resistant temperature refers to the temperature at which the length increment of the sample is less than 0.2% and the average oxidation weight increment is less than 0.5g/(m2 h) after 150 H. When

Compared with traditional smelting, vacuum induction smelting has many advantages, such as energy saving, environmental protection, good working environment and low labor intensity. By using induction melting technology, the impurities of the final casting alloy material are less, the proportion of alloy added is more appropriate, and it can more meet the requirements of the process on the properties of the material. Maintenance of vacuum heat treatment furnace is one of the important contents of vacuum furnace management. Its purpose is to restore the performance of vacuum furnace. Once the vacuum heat treatment furnace loses its performance completely or partially, the managers of the vacuum furnace should judge the cause of the failure according to the failure phenomenon, then decide the repair scale, and then organize the repair. To be able to accurately determine the cause of the failure, it is necessary to understand the equipment structure, working principle, func

1) Vacuum heat treatment furnace is heated in vacuum. Vacuum can prevent oxidation and degassing. A. Anti-oxidation function makes the surface of the workpiece free of decarburization, carburization and removal of phosphorus chips and rust on the surface of the workpiece. The surface of the workpiece is purified, and the solder and catalyst can be better attached to the workpiece surface and the quality of the product can be improved. B. Degassing. Improve the surface purity and fatigue strength, plasticity and toughness of materials. Thus, the mechanical properties and service life of the workpiece are improved. (2) High heating temperature can effectively degrease and remove oil contamination, evaporate various impurities and purify the workpiece surface, thus further improving product quality. (3) The heating rate in the vacuum heat treatment furnace can be controlled, and the temperature deviation in the constant temperature zone is small. It can also be heated slowl

Vacuum furnaces are industrial furnaces heated by electrothermal elements in the near vacuum state. They are mainly used in ceramic firing, vacuum smelting and degassing annealing of electrovacuum parts. The working principle of vacuum furnace of heat treatment equipment is to form a low-pressure environment with little air by extracting vacuum, and then to produce steam by boiling water at low pressure (below atmospheric pressure). The principle of heat output by condensation heat transfer of steam and water works. Vacuum Furnace for Heat Treatment Equipment Compared with other types of furnaces, vacuum furnaces have several distinct advantages: (1) The environment will not be polluted and there is no need to treat the three wastes. (2) Due to the use of high-quality insulation materials to make insulation walls and barriers, energy consumption is low and energy saving effect is remarkable; (3) High accuracy of temperature control. Vacuum furnace equipment Vacuum pum

Vacuum heat treatment is a comprehensive technology combining vacuum technology with heat treatment. It refers to all and part of heat treatment process carried out in vacuum. The vacuum furnace of heat treatment equipment has high thermal efficiency, can achieve rapid heating and cooling, can achieve no oxidation, decarbonization, carburization, can remove the phosphorus chips on the surface of the workpiece, and has the function of degreasing and degassing, so as to achieve the effect of bright surface purification. Vacuum heat treatment is a comprehensive technology combining vacuum technology with heat treatment. It refers to all and part of heat treatment process carried out in vacuum. China divides vacuum into low, medium, high and ultra-high vacuum. At present, the working vacuum of most vacuum heat treatment furnaces ranges from 1.33 to 1.33 x 10 -sup3; Pa. Vacuum Furnace for Heat Treatment Equipment Good working environment, safe operation, no pollution and pol

Vacuum furnace plays an irreplaceable role in the production of mould. It is mainly used for ceramic firing, vacuum exercise, degassing of electric vacuum parts, annealing, brazing of metal parts, and ceramic-metal sealing. Vacuum heat treatment of vacuum furnace can almost complete all heat treatment processes, such as quenching, annealing, tempering, carburizing, nitriding, gas quenching, oil quenching, nitrate quenching, water quenching, and vacuum brazing, sintering and surface treatment. Vacuum furnace has high thermal efficiency, can complete rapid heating and cooling, can complete no oxidation, no decarbonization, no carburization, can remove the phosphorus chip on the surface of the workpiece, and has the effect of degreasing and degassing, and then achieve the effect of external bright purification. Generally speaking, the processed workpiece is heated slowly in the furnace, the difference of internal heat temperature is small, the thermal stress is small, so th

1. Vacuum heat treatment furnace can be divided into vacuum quenching furnace, vacuum tempering furnace, vacuum annealing furnace and so on. 1. Vacuum quenching furnace; vacuum quenching furnace can be divided into vacuum oil quenching furnace and vacuum gas quenching furnace. 1. 1 Vacuum oil quenching furnace is suitable for vacuum heat treatment of die steel, spring steel, stainless steel, bearing steel, superalloy steel, etc. Its main features are wide data scale, strong hardenability, low cost and reusable quenching oil. The shortcomings are: the deformation is relatively large, and the workpiece needs cleaning afterwards. The vacuum oil quenching furnace can be divided into two-chamber furnace and three-chamber furnace. 1. 2 Vacuum high pressure gas quenching furnace is suitable for vacuum heat treatment of high speed steel, stainless steel, die steel and other materials with good hardenability. It is characterized by small deformation of parts and no need for clean

In vacuum pressure sintering furnace, sinter is subjected to both high temperature and mechanical pressure and vacuum. It can be used to sinter products with density second only to that of casting products. Generally, powder materials are filled into graphite moulds under 700-1500MN/m3 mechanical pressure and heated to 2500 C in vacuum. The mould can be heated directly by electric current or indirectly by induction. Vacuum pressure sintering furnace is mainly used to sinter dense billets which are easy to react with high temperature gas, such as oxides, carbides, borides, etc. After sintering, the density can reach a high density, which is more than 95% of the theoretical value, and has high purity. Graphite resistors and graphite moulds lose very little weight in vacuum operation. Vacuum hot pressing sintering is to control the quality of sintered body by using many parameters such as high pressure, temperature and time in compaction process. Powder Material Technol

Theoretical analysis of rapid leakage of vacuum heat treatment furnace Vacuum degree drops quickly, need not consider more commonly, affirmation exists leak point. It is much easier to find the cause of rapid leakage than the trace leakage, and the problem can be solved by the method of theoretical analysis, at most supplemented by a simple leak detection method, the leakage point can be found. The basis of theoretical analysis is data. Without real and detailed data, it is impossible to carry out theoretical analysis. When the vacuum degree of the vacuum heat treatment furnace is abnormal, it is necessary to observe in detail the process of vacuum degree decline, the working condition of the equipment before and after the vacuum degree decline, and the data changes of each indicating instrument on the equipment, including the changes of the backfilling pressure gauge. These data are important basis for theoretical analysis. Sometimes theoretical analysis based on data c

We all know that there are many factors that affect the price of the water ring vacuum pump. Next, we will give you a detailed introduction: The first is the configuration of the model. For different models of vacuum pumps, the price is not the same, and now the water ring vacuum pump in the market is like this, so that we can choose the model we choose or the efficiency of our work. If the price is too cheap, the performance of the water ring vacuum pump can not be guaranteed. If you think about it, if the price is much larger than the same model on the market, we can easily see the quality of the water ring vacuum pump. Absolutely not very high, maybe there is no problem at the time of use, but after a period of time, it will definitely be found that the performance of the water ring vacuum pump itself is not guaranteed. In order to avoid unnecessary maintenance costs, we still have to guarantee our water ring. The quality of the vacuum pump, you can not buy a cheap wa

Powder metallurgy vacuum sintering furnace is a time-varying non-linear 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 on-line real-time display of controlled quantity 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

The water ring vacuum pump is a commonly used vacuum device. It consists of a pump casing, an impeller, an inlet and an exhaust pipe, and a rotating shaft. The rotating shaft and the impeller are eccentrically arranged in the pump casing, and the outer circumference of the impeller is cut in one side and the inner wall of the casing. . The pump is filled with half of the water in the pump casing before starting. When the motor drives the impeller to rotate, due to the centrifugal force, the water is sucked onto the inner wall of the casing to form a rotating water ring concentric with the inner wall of the casing, the water ring and the impeller. Differently, the gap formed between the upper blades of the impeller and the inner surface of the water ring is smaller than the gap formed between the lower blades of the impeller and the inner surface of the water ring. When the impeller rotates, the gap formed between the blades and the inner surface of the water ring gradual

High temperature experimental vacuum furnaces are mainly used in ceramic, metallurgy, electronics, glass, chemical industry, machinery, refractories, special materials, building materials, universities, scientific research institutes, industrial and mining enterprises to do powder roasting, ceramic sintering, high temperature experiments, material processing, quality universities, scientific research institutes, industrial and mining enterprises to do high temperature atmosphere sintering, atmosphere reduction, CVD experiments, vacuum annealing and so on. Main functions and characteristics of vacuum atmosphere furnace for high temperature test: 1. The control system of the equipment is in the leading position in the world. It is safe and reliable, easy to operate, high precision in temperature control, good heat preservation effect, wide temperature range, high uniformity of furnace temperature, many temperature zones, optional atmosphere, vacuum furnace type, etc. 2. O

Large horizontal vacuum annealing furnace is a vacuum heat treatment equipment for annealing rare metal pipes such as titanium and zirconium. The longest size of annealing workpiece is 16m, which is the longest vacuum annealing furnace with the largest length and capacity in China. Vacuum annealing furnace is an important technological process for the processing of intermediate and finished products of rare metals such as titanium and zirconium. Stress relief recrystallization annealing is carried out without oxidation and pollution to eliminate work hardening and restore plasticity. In recent years, with the rapid development of domestic aviation, aerospace, navigation, nuclear power, national defense and other cutting-edge industries, not only the demand for rare metal tubes and bars such as titanium and zirconium has been greatly increased, but also their quality and performance have higher requirements. The length of single tube and bar has also increased from 3 m~6

Electric furnace is one of the indispensable smelting equipments in special steel production. At present, the competition in the industry is fierce. It takes about 45 minutes to tap steel with conventional converter, and about 70 minutes to tap steel with electric furnace. Therefore, how to further shorten the smelting time of electric arc furnace, reduce consumption, and then reduce the cost by a large margin is the inherent need of the development of many special steel enterprises. The commonly used techniques for strengthening EAF smelting are: 1. The Technology of Electric Furnace Mixing Hot Metal Hot metal has a certain amount of physical heat, and contains high calorific value elements such as carbon, silicon and manganese. Oxygen blowing and oxidation can release a large amount of chemical heat, which makes scrap steel red-hot quickly and easy to cut with oxygen. Therefore, by adding hot metal, the smelting time can be shortened and the smelting efficiency can be

The work of vacuum system is divided into preparation process, water lifting process and recovery process. 1. Preparation process After opening the drain valve to drain water in the empty tank for the first time, close the drain valve, open the tap water manual inlet valve, and fill the tank with water. When the low water level (low drain pipe) is reached, close the tap water inlet valve and the preparation process is completed. At this point, the water ring vacuum pump has been slightly lower than the opening position of the low drain pipe supply pipe filled with water, can be carried out lifting water operation. 2. Water lifting process In the process of starting the water ring vacuum pump, firstly judge whether the electric valve after the pump is closed and whether the external water level is lower than the pump shell. If these conditions are met, the vacuum system can be started to work, and the air in the pump can be extracted, and then the pump can be started.