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Langfeng introduce the significance of tool cold treatment process
2016-02-19
It is understood that the cold treatment process tool refers to the termination point of martensitic transformation temperature drops below 0 ℃, after quenching tissue contains a large number of retained austenite, to make the residual austenite into martensite, the after quenching into cold continue cooling agent or a refrigerator in practice.
Cold treatment temperature should be based on the chemical composition of steel (Mf point) to select. For most of the steel is ice, alcohol mixture (-78 ℃) to meet the requirements. Ice treatment should be carried out immediately after quenching, in order to avoid long-term placement led to the stabilization of residual austenite and produce effects of cold treatment effect.In order to avoid cold cracking treatment of some complex shape of the workpiece, in a cold treatment may be tempered. For some higher dimensional stability requirements of the workpiece, such as thread gauge etc., often require twice cold treatment. Cold treatment must be tempered or aging, in order to eliminate the stress and stability of martensite formed a new generation.
Workpiece when the cold treatment no insulation, only when it reached the central portion to the cold refrigerant temperature (typically 1 ~ 2h). After treatment of the workpiece is removed from the ice-cold agent, after slowly warming to warm to room temperature during tempering in air.Most of the cold treatment temperature at -70 ℃ ~ -80 ℃ mainly choose cold temperature treatment is mainly based on MS steel (martensite start temperature) and Mf (martensite finish temperature) temperatures, but also with the technical requirements of the relevant parts. Ms <T <Mf. Not the temperature as low as possible, as long as you can meet the technical requirements. Low-carbon alloy carburizing steel mostly -70 ℃ ~ -80 ℃.
Most of the cold treatment temperature at -70 ℃ ~ -80 ℃ mainly choose cold temperature treatment is mainly based on MS steel (martensite start temperature) and Mf (martensite finish temperature) temperatures, but also with the technical requirements of the relevant parts. Ms <T <Mf. Not the temperature as low as possible, as long as you can meet the technical requirements. Low-carbon alloy carburizing steel mostly -70 ℃ ~ -80 ℃.Cold treatment process has his own value of existence, through the cold treatment processing technology over the machine, the machine does not have other than your features. An air turbine refrigerator is based on the basic principles of manufacturing expansion refrigeration compressed air, which is characterized by significant,First, the cooling speed, can quickly reach the process temperature. Second, environmental pollution, cooling medium is compressed air. Third, wide operating temperature range, no cream. Fourth, freezers, cold boxes separate, easy to upgrade. The main thing is it is simple, easy maintenance.
Tool cold treatment process is carried out according to the chemical composition of the scientific manufacture of steel, these techniques apply to tools, measuring tools, the precision instrument, not only improve the product value, but also greatly enhance the work efficiency.
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