Cryogenic treatment function and classification

2020-12-07 14:18:27

Cryogenic treatment technology is a new technology developed on the basis of ordinary cold treatment (-100~0°C) in the 1960s. It is a method of processing materials below -130°C. It is stronger than new materials. One of the toughening treatment processes. Cryogenic treatment can effectively improve the mechanical properties and service life of steel materials, non-ferrous metals and composite materials, stabilize size, improve uniformity, reduce deformation, and be easy to operate, without damaging the workpiece, without pollution, low cost, and has positive applications Prospects and development space.

In particular, the United States, Japan, the United Kingdom, Russia and other countries are actively carrying out research in this area and applying this technology to many fields to process materials, such as aerospace, precision instruments, friction parts, tools, Moulds and measuring tools, textile machinery parts, automotive industry and military science have achieved great economic benefits. Some units in my country have also carried out research and application of cryogenic treatment, especially in the standard industry, tool industry, textile industry, nozzle oil pump, bearing, aerospace sector, etc. The materials are mainly tool steel, bearing steel and high-speed steel.

　　 Cryogenic treatment effect:

　　 1. Improve the hardness and strength of the workpiece

　　2, ensure the dimensional accuracy of the workpiece

　　3, improve the wear resistance of the workpiece

　　4. Improve the impact toughness of the workpiece

　　 5. Improve the internal stress distribution of the workpiece and increase the fatigue strength

　　 6. Improve the corrosion resistance of the workpiece

　　 Cryogenic treatment classification: According to different cooling methods, cryogenic treatment can be divided into two types: refrigerator method and cryogenic liquid cooling method.

　　 Compressed air refrigeration has been used to a certain extent, but due to the complex structure and inconvenient maintenance of the equipment, it is rarely used. The low-temperature refrigerator developed in recent years is expected to be widely used near -100°C due to its compact structure and easy operation due to the decrease of the minimum refrigeration temperature. However, for the cryogenic treatment with lower temperature, the application time is not yet ripe. The cryogenic liquid cooling method is often used. Because the temperature of liquid nitrogen is suitable, the source is wide, there is no pollution, and the price is relatively cheap. In most cases, liquid nitrogen is used as the cold medium, and sometimes it is obtained by mixing liquid nitrogen and alcohol. Different temperatures.

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