Wed, 17 Oct 2018 02:52:59 +0000
Vacuum heat treatment equipment
1. Vacuum heat treatment process principle
(1) the phase transformation characteristics of metals in vacuum. Thermodynamics and kinetics of solid-state phase change do not change much in vacuum with atmospheric pressure of only 0.1 MPa. When formulating the vacuum heat treatment process rules, the principle of solid phase transformation can be completely based on atmospheric pressure. It is entirely possible to refer to data of various types of tissue transformation under atmospheric pressure.
(2) vacuum degassing, improving physical and mechanical properties of metal materials.
(3) vacuum degreasing.
(4) evaporation of metals: heating in vacuum and evaporation of elements on the surface of the workpiece.
Vacuum heat treatment technology is the combination of vacuum technology and heat treatment technology, which can effectively improve the quality of metal materials and promote the continuous improvement of China’s industrial production technology. When the metal is heated in an air furnace, it will react with oxygen, steam, carbon dioxide and other oxides in the air, which will seriously affect the quality of metal materials, resulting in the quality of metal materials is reduced. Vacuum heat treatment furnace can solve this problem very well. In the process of metal heating, the metal is in a completely vacuum environment, and the heat treatment process is completed under different external environment contacts, thus effectively avoiding impurity mixing and improving the quality of metal materials.
2.Metal heat treatment furnace the characteristics
2.1 unique water cooling device settings
Because the vacuum heat treatment furnace needs to carry on the effective heat treatment work to the metal material under the vacuum condition, therefore, the vacuum heat treatment furnace needs to carry on the effective cooling to all parts of the treatment furnace in the use process, guarantees the equipment security as well as the equipment normal operation. At present, most vacuum heat treatment furnaces in our country adopt water-cooled devices to reduce the temperature of parts, so that the vacuum sealing ring of vacuum heat treatment furnaces will not be overheated or burned, so as to ensure the normal operation of vacuum heat treatment furnaces and improve the service life of vacuum heat treatment furnaces.
2.2 good sealing performance
Good sealing is the main feature of vacuum heat treatment furnace, and only by ensuring the sealing of the furnace, can the contact between metal materials and external oxides be reduced, thus effectively improving the quality of metal materials. In the design process, in order to ensure the vacuum performance of the vacuum heat treatment furnace, the vacuum heat treatment furnace often undergoes strict treatment procedures, such as gas-tight welding of the furnace body, try not to open holes in the furnace body of vacuum heat treatment, reduce the chance of air mixing. At the same time, other parts of the vacuum heat treatment furnace should be strictly sealed to improve the overall tightness of the vacuum heat treatment furnace.
2.3 high efficiency thermal insulation materials and heating materials
Because the internal operating environment of the vacuum heat treatment furnace will not be mixed with oxygen and other oxidizing gases, so it can effectively improve the heating efficiency and overall quality of metal materials. It is precisely because of this problem that the vacuum heat treatment furnace can choose heating and insulation materials without considering oxidation problems and can pay more attention to materials. The heating efficiency and insulation efficiency of the material. Generally speaking, the insulating materials and heating materials used in vacuum heat treatment furnace are tantalum, tungsten, molybdenum and graphite. Although these materials are easy to oxidize in the atmosphere, these insulating materials and heating materials can play a good role in the actual production process because of the characteristics of vacuum heat treatment furnace. Use.
2.4 automation operation
During the operation of the vacuum heat treatment furnace, it needs dozens of actions to complete the heat treatment of metal materials. Under the manual operation, it is easy to make mistakes, which leads to confusion in the production process and the decline of the quality of metal materials. Therefore, it is necessary to ensure the continuity and existence of the vacuum treatment furnace. Therefore, another characteristic of vacuum heat treatment furnace is efficient and automatic production mode. The degree of automation of vacuum heat treatment furnace is very high. Through the operation of relevant programs, all the actions in the working process of vacuum heating furnace can be guaranteed to be completed within 15 seconds without any omissions, thus effectively ensuring the overall operation efficiency of vacuum heating furnace and ensuring the quality of heating materials.
2.5 unique low voltage and high current design
Generally speaking, there is no gas in the environment of vacuum heat treatment furnace. If the voltage inside the vessel is too high, it is very easy to cause damage to the related electric heating elements during the discharge process, which makes the equipment unusable. To solve this problem, vacuum heat treatment furnaces are designed with low voltage and high current to avoid the influence of equipment caused by discharge process. At the same time, the structure of the electric heating element will take certain preventive measures to avoid glow discharge or arc discharge.
3. Vacuum heat treatment furnaces product types of common
3.1 external heat vacuum heat treatment furnace
External heating vacuum furnace is an earlier product of vacuum heating furnace. Its structure is relatively simple, and the lack of water-cooling equipment, which leads to the working temperature of external heating vacuum furnace can not be too high, otherwise it will seriously affect the structure of the furnace itself. External heating furnace in the actual operation process, can avoid outside gas to participate in heat treatment work, can basically ensure the quality of heating materials, is the most widely used vacuum heating equipment.
3.2 internal heat vacuum heat treatment furnace
The internal heat vacuum heat treatment furnace is a vacuum heat treatment equipment which develops rapidly at present. There are many kinds and quantities of internal heating vacuum heat treatment furnaces, which are heated by resistance and need to be cooled. They are often used in annealing, quenching, sintering, tempering and other processes, and the effect is very good. The working environment of the internal heat treatment furnace is more stable and efficient than that of the external heat treatment furnace, which can guarantee the smooth development of the material heat treatment. The automatic operation procedure also greatly improves the working efficiency of the vacuum heat treatment furnace. It is the most promising vacuum heat treatment equipment at present.
4. Development trend of vacuum heat treatment furnace
With the continuous improvement of technology and international exchanges, the development speed of vacuum heat treatment furnaces in China has been greatly improved, which can meet the production requirements of Chinese industrial enterprises, promote the production quality of Chinese industrial products and make our industrial products compete internationally. Competition is rising. However, there are still some problems and shortcomings in the development of vacuum heat treatment equipment.
Firstly, the service performance of vacuum heat treatment furnace in China is not stable enough, and the service life of vacuum heat treatment furnace is obvious. The main reason is that the structure design and technology level of vacuum heat treatment furnace are different from the advanced technology and technology abroad. We need to study and explore unceasingly to improve the whole vacuum heat treatment furnace in China. Quality level. Secondly, another important problem of vacuum heat treatment furnace in our country is the accessory equipment of vacuum heat treatment furnace. These accessory equipment play a very important role in the production process of vacuum heat treatment furnace, such as hydraulic system, power transformer, heating materials and so on. These are the basis to ensure the normal operation of vacuum heat treatment furnace, but In the actual operation process, the volume of these ancillary equipment is large, noise is high, and there are certain problems of sealing, resulting in the production environment and production safety performance greatly reduced, easy to cause serious production accidents. Therefore, China’s vacuum heating furnace will focus on the design of structure and related parts, accessories. The research of vacuum heat treatment equipment can improve the service life and work quality of vacuum heat treatment furnace, make vacuum heat treatment equipment can better serve industrial production, and promote the rapid development of social economy in China.
Vacuum heat treatment furnace is very important for industrial production in China. Vacuum heat treatment furnace can effectively improve the overall quality of heating products, provide high-quality products for industrial production in China, and promote the rapid development of China’s industry. However, we need to recognize the problems and shortcomings of vacuum heat treatment furnace, we need to continue to explore and study in the future work process, to solve technical problems, improve vacuum heat treatment equipment, so that vacuum heat treatment furnace can play a greater role in the process of industrial development in China.
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