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First, the structure composition of ultra-low temperature freezer and metal cryogenic treatment box

Ultra-low temperature freezer, metal cryogenic treatment box, also known as industrial low temperature freezer, is mainly composed of low temperature compressor, condenser, condensation evaporator, oil separator, evaporator, insulation box, Siemens PLC control system and other major components.

Second, the role of metal cryogenic treatment

1. The transformation of residual austenite to martensite

2. Precipitate ultrafine carbide particles with diffusion distribution

3. Reduce the residual stress of metal materials

The cryogenic treatment process is a process in which metal materials or parts are placed in a low temperature environment of -65 °C ~ -160 °C for rapid freezing treatment, so that the residual austenite in the metal is converted into martensite. It is a "soft" phase, low hardness, strength, unstable, will change during use, cause part volume changes, affect the fatigue life of steel, surface easy wear, not wear-resistant, size instability! Therefore, generally after quenching, the temperature is reduced below the martensite transition termination point, which can transform the residual austenite of the face-centered cubic structure into the martensite of the body-centered cubic structure, thereby improving the hardness, strength and dimensional stability of the part.

Third, the working principle of cryogenic treatment is introduced

Cryogenic treatment of cryogenic box is the use of compressor compression refrigerant as cooling medium, programmed cryogenic treatment (-160 °C) and low-temperature tempering of materials, so as to achieve the purpose of improving and strengthening the properties of metal materials.

The so-called cryogenic treatment is to use the compressor refrigeration method to continue the cooling process of the quenched metal material to reach a certain temperature far below the room temperature, so that the residual austenite existing after conventional heat treatment is further converted into a tool steel hardening. A large number of residual austenite in the metal transforms martensite, precipitates dispersion, and the fine dispersed carbide hinders the dislocation movement in the raw material, thereby strengthening the matrix structure, and at the same time plays a grain boundary strengthening role by ultrafine carbonization, thereby changing the performance of the tool steel workpiece, making it have the impact toughness and wear resistance of the tool steel workpiece, the dimensional stability of the tool steel workpiece, the service life of the tool steel workpiece, and the interference assembly.

Experiments have proved that after low temperature treatment of high-speed steel tools, the wear resistance is increased by 3 times. The coefficient of friction is reduced by 20%, the hardness is increased by 1-4 times, and the service life is increased by 1-3 times. Experiments on other materials have also obtained similar results for extending the service life, such as alloy steel, polycrystalline diamond, etc., especially the treatment effect of stamping dies is particularly obvious, and the service life is increased by dozens of times. These two profound changes make low-temperature cold treatment technology have unique advantages.

At the same time, our company can design, manufacture, all kinds of non-standard industrial low-temperature freezers, low-temperature industrial refrigerators, cryogenic assembly boxes, metal cryogenic treatment boxes, ultra-low temperature freezers, ultra-low temperature freezers, industrial cryogenic freezers, low-temperature cryogenic boxes, cryogenic units, anti-corrosion or explosion-proof low-temperature units;