Tue, 31 Jul 2018 01:33:40 +0000
Vacuum heat treatment furnace
The vacuum system of a vacuum heat treatment furnace
The vacuum system of the vacuum heat treatment furnace is generally composed of vacuum pump, vacuum valve, vacuum measuring instrument, cold trap, pipe and other parts. Several common vacuum systems are described below:
High temperature heat treatment furnace refers to the equipment used for heat treatment process, including box type high temperature furnace, vacuum tube type furnace, box type atmosphere furnace, high temperature vacuum furnace, zirconia sintering furnace, denture crystallization furnace and other special dental sintering furnace. In the heat treatment workshop, there are also fuel, power, water, gas and other power supply equipment needed for heat treatment production, as well as lifting transportation equipment, production safety and environmental protection equipment. We usually refer to the equipment that completes the heat treatment process as the main equipment. The equipment necessary to support and maintain production with the main equipment shall be used as auxiliary equipment.
Pressure measuring and controlling device of vacuum heat treatment furnace
Vacuum degree is one of the important technical parameters in the process of vacuum heat treatment. How to improve the precision of vacuum measurement, the reliability of control and the degree of automation of the working process of vacuum system are very concerned.
Vacuum heat treatment is heat treatment in a thin atmosphere. It can keep the chemical composition of metal surface and the dimension precision of workpiece, improve the mechanical properties of metal materials, and make metal obtain the smooth surface without oxidation and corrosion. The temperature, vacuum degree and time of heat treatment process must be controlled strictly in order to achieve the desired target. How to realize the optimal control of these parameters has been deeply studied by Chinese engineers and relevant experts. For example, the application of microcomputer technology to program control of heat treatment process and temperature of vacuum furnace, and the application of digital PID regulation law to temperature control, etc. The application of these new technologies has greatly narrowed the gap between China’s vacuum heat treatment equipment and technology with foreign advanced level, and reached the international advanced level in terms of furnace temperature uniformity, ultimate vacuum and pressure rise rate. However, from the perspective of the system, the automation of the whole machine has yet to be improved. The vacuum measurement basically stays in the manual operation mode, and the pressure adjustment cannot be controlled automatically. In order to improve the automation degree of vacuum measurement and control of vacuum heat treatment furnace, we introduced microcomputer technology and digital measurement technology into the vacuum system and developed a set of microcomputer pressure measurement and control device
Research on heat treatment pressure quenching in vacuum furnace
Parts can satisfy the strict specification high hardness as stress strain, the research objective of the fire. The adoption of pressurized gas in the vacuum furnace cooling system, improves the performance of the process and parts to improve, so lead to pressure vessel furnace in the whole industry. Because of the limitation of the furnace under positive pressure operation is very strict, this requires that the operator must strictly abide by rules of operation when using the device. The service life of the furnace due to the performance of the high pressure change, so must be of high pressure gas quenching furnace is often established test and operation procedures. The suitable process of pressurized gas quenching in a laminated vacuum furnace is obtained. The pressurized gas quenching process is implemented by adopting high speed circulation gas, in order to achieve a high cooling rate, high velocity gas absolute pressure in l.s xlo5Pa. The low pressure quenching eliminates several atmospheric pressure under the strain of fire restrictions, reduces the vacuum container manufacturing costs, and greatly reduce the consumption of gas quenching. Once the engineering design of the above characteristics is realized, the feasibility of part maintenance becomes the main problem to be considered in the design of pressure quenching system. The most popular design feature of the furnace is the emphasis on convenience, that is, in order to maintain and load easily to the furnace hot zone, the furnace chamber is divided.