Vacuum pump technology in tool heat treatment of specific application
With the technological progress and product upgrade of the equipment manufacturing industry, especially with the introduction of the national strategy to revitalize the equipment manufacturing industry, higher and higher technical requirements are put forward for the tools. High speed, high efficiency, high reliability, environmental protection, saving and other tools have become the development theme. Because the traditional salt bath heat treatment has some shortcomings, it is necessary to adopt the new heat treatment technology in the production of tools. In this paper, the development characteristics of vacuum heat treatment technology and the specific application of imported vacuum pump technology in tool heat treatment are introduced.
In our country, more than 75% of the tools are made of high speed steel. Heat treatment is one of the key processes in the manufacture of high speed steel tools. For the domestic, at present, most of the high speed steel tools still use salt bath for heat treatment. Salt bath heat treatment has the advantages of small investment, easy to operate, good hardenability of products.
However, salt bath heat treatment has its obvious shortcomings, mainly reflected in the following aspects:
1. Pollution and waste disposal, which are the main problems of salt bath heat treatment;
2. Energy consumption: low heat utilization rate of salt bath treatment makes it a large energy consumption;
3. Temperature control accuracy. Generally speaking, indirect temperature measurement is adopted in salt bath heat treatment, and the temperature control precision is poor;
4. Product decarburization and deformation. Salt bath heat treatment is easy to produce product decarburization and deformation.
Tools are one of the important components of equipment manufacturing, aerospace, automobile, shipbuilding and other national strategic industries. If the machine is the mother machine, then, the tool is the tooth, its performance directly affects the quality and quality of the product.
The development direction of heat treatment technology puts forward four requirements:
1. Clean and heat treatment;
2. Energy-saving heat treatment;
3. Precision heat treatment;
4. Less gasification heat treatment.
Through the analysis of the specific application of vacuum pump technology in tool heat treatment, we understand the development characteristics of vacuum heat treatment technology.
Vacuum heat treatment is a new heat treatment technology combining vacuum technology and heat treatment technology. The vacuum environment of vacuum heat treatment refers to the atmosphere environment under one atmosphere pressure, including low vacuum, medium vacuum, high vacuum and ultra-high vacuum. Vacuum heat treatment actually belongs to atmosphere controlled heat treatment. Vacuum heat treatment refers to the whole and part of the heat treatment process in the vacuum state, the quality of heat treatment is greatly improved. Compared with the conventional heat treatment, the vacuum heat treatment can achieve no oxidation, no decarburization, no carburizing, can remove the phosphorus chips on the surface of the workpiece, and degreasing and degassing, so as to achieve the effect of surface brightness purification.
Vacuum technology, as an environmentally friendly, resource-saving and technologically advanced heat treatment method, will be further promoted and developed in the tool industry with the upgrade of tool product quality and the harmonious unification of environment and development. Vacuum as a kind of green, environmental protection technology, after many years of development, imported vacuum pump technology has been successfully applied in tool heat treatment.