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1、 Structural composition of ultra-low temperature freezer and metal cryogenic treatment box
Ultra low temperature freezer and metal cryogenic treatment box, also known as industrial low-temperature refrigerator, are mainly composed of several components such as low-temperature compressor, condenser, condensing evaporator, oil separator, evaporator, insulation box, Siemens PLC control system, etc.

2、 Characteristics and advantages of ultra-low temperature freezer technology
1. Adopting single compressor automatic cascade refrigeration technology, the lowest temperature can reach -160 ℃
2. The pipeline is simple, the automatic cascade refrigeration system has a low failure rate, and can work continuously and stably for a long time
3. Strong load-bearing capacity inside the box (10~1200kg), wide temperature control range (adjustable from+100 ℃ to -160 ℃)
4. Adopting unique secondary foaming technology, it effectively prevents low-temperature damage to the insulation layer. The 200mm ultra thick insulation layer has good insulation effect
5. The inner box is equipped with strong cold air circulation to ensure temperature uniformity of ≤ 1 ℃
6. Fast and efficient heating defrosting method -150 ℃~+100 ℃ ≤ 30min
7. Easy to operate: simply connect the power supply to use
8. Efficient: The temperature inside the box changes from room temperature to the target temperature within 150 minutes for the first time
9. Low cost of use: simply connect to the power supply, no other vulnerable parts or consumables, safe and reliable.
10. We can customize various sizes and temperature zones according to user needs
11. Fault self diagnosis, leakage, missing items

3、 Application scope of ultra-low temperature freezer
1. Cryogenic treatment of metal materials such as high-speed steel, bearing steel, and mold accessories
2. Bearing, copper sleeve cold shrink assembly, interference fit assembly of precision mechanical components
3. Precision assembly, hardware cutting tools, mold cold and hot treatment
4. Aerospace, hardware, tools, friction parts, precision machining, measuring tools, textile machinery, automotive and many other fields
5. Ensure the dimensional accuracy of the workpiece after deep cooling, improve the wear resistance and impact toughness of the workpiece, and improve the internal stress distribution of the workpiece

4、 The role of metal cryogenic treatment
1. Transformation from residual austenite to martensite
2. Precipitation of ultrafine carbide particles with dispersed distribution
3. Reduce residual stress in metal materials
Cryogenic treatment process is a rapid freezing treatment of metal materials or components in a low-temperature environment of -65 ℃ to -160 ℃, which transforms the residual austenite in the metal into martensite. It is a "soft" phase with low hardness and strength, unstable, and can undergo transformation during use, causing changes in the volume of parts and affecting the fatigue life of steel. The surface is prone to wear, not wear-resistant, and has unstable dimensions! Therefore, after quenching, the temperature is generally reduced to below the termination temperature of martensitic transformation, which can transform the residual austenite of face centered cubic structure into martensite of body centered cubic structure, thereby improving the hardness, strength, and dimensional stability of the parts.

5、 Introduction to the working principle of cryogenic treatment
Cryogenic treatment in a cryogenic box uses a compressor to compress refrigerant as a cooling medium, and carries out programmed cryogenic treatment (-160 ℃) and low-temperature tempering on materials to improve and strengthen the properties of metal materials.
The so-called cryogenic treatment refers to the use of a compressor refrigeration method to continue the cooling process of quenched metal materials, reaching a temperature far below room temperature, and promoting the further transformation of residual austenite existing after conventional heat treatment into a material that can harden tool steel. A large amount of residual austenite in metals transforms into martensite, precipitates and disperses, and fine dispersed carbides hinder dislocation movement in the raw material, thereby strengthening the matrix structure. At the same time, ultrafine carbonization plays a role in grain boundary strengthening, thereby changing the performance of tool steel workpieces, making them have impact toughness and wear resistance, dimensional stability of tool steel workpieces, improved service life of tool steel workpieces, and interference fit assembly.
Experimental results have shown that after low-temperature treatment, the wear resistance of high-speed steel cutting tools has increased by three times. The friction coefficient decreased by 20%, the hardness increased by 1-4 times, and the service life increased by 1-3 times. Similar results have also been obtained in experiments with other materials, such as alloy steel, polycrystalline diamond, etc. The processing effect of stamping molds is particularly significant, and the service life is increased by tens of times. The profound changes in these two aspects give low-temperature cold treatment technology unique advantages.
At the same time, our company can design, manufacture, and provide various non-standard industrial low-temperature refrigerators, low-temperature industrial refrigerators, cryogenic assembly boxes, metal cryogenic treatment boxes, ultra-low temperature refrigerators, ultra-low temperature freezers, industrial low-temperature freezers, low-temperature cryogenic boxes, cryogenic units, anti-corrosion or explosion-proof low-temperature units according to user needs;