It is understood that the cold treatment process of the tool means that the martensite transformation end point will drop to below 0 ° C. After quenching, the structure contains a large amount of retained austenite, in order to transform the retained austenite into martensite, The quenched workpiece is placed in a cold agent or a chiller to continue cooling.
The ice-cold treatment temperature should be selected based on the chemical composition of the steel (Mf point). Dry ice and alcohol blends (-78 ° C) are sufficient for most steels. The ice-cooling treatment should be carried out immediately after quenching to prevent the long-term placement from stabilizing the retained austenite and affecting the cold treatment effect. Some shapes of complex workpieces are designed to avoid cracking during cold treatment and can be cold treated after a tempering. For some workpieces with higher dimensional stability requirements, such as thread gauges, it is often necessary to perform two cold treatments. Cold treatment must be tempered or aged to eliminate the stresses formed and stabilize the newly formed martensite structure.
The workpiece does not need to be kept warm during the ice-cooling treatment, only when the heart reaches the cold agent temperature (generally 1 to 2 hours). After the ice-cooling treatment, the workpiece is taken out from the cold agent, and slowly warmed to room temperature in the air, and then tempered. The ice-cold treatment temperature is mostly in the range of -70 ° C to -80 ° C, and the temperature selected for the ice-cooling treatment is mainly based on the MS (the martensite transformation start temperature) and the Mf (the martensite transformation end temperature) temperature of the steel, The technical requirements of the parts are relevant. Ms < T < Mf. It is not the lower the temperature, the better, as long as the technical requirements are met. Low carbon alloy carburized steel is mostly -70 ° C ~ -80 ° C.
The ice-cooling process has its own value. Machines that have been processed through the ice-cold process have other machines that cannot be compared to yours. For example, the air turbo refrigerator is manufactured according to the basic principle of compressed air expansion and refrigeration. Its characteristics are remarkable. First, the cooling speed is fast and the process temperature can be quickly reached. Second, the environment is non-polluting and the cooling medium is compressed air. Third, the operating temperature range is wide and there is no frost. Fourth, the freezer and low temperature box are separated for easy upgrading and transformation. The main thing is that it is easy to operate and easy to maintain.
The tool ice-cooling process is scientifically manufactured according to the chemical composition of the steel. These technologies are applied to tools , measuring tools and precision instruments, which not only improve the use value of the products, but also greatly improve the work efficiency.
The ice-cold treatment temperature should be selected based on the chemical composition of the steel (Mf point). Dry ice and alcohol blends (-78 ° C) are sufficient for most steels. The ice-cooling treatment should be carried out immediately after quenching to prevent the long-term placement from stabilizing the retained austenite and affecting the cold treatment effect. Some shapes of complex workpieces are designed to avoid cracking during cold treatment and can be cold treated after a tempering. For some workpieces with higher dimensional stability requirements, such as thread gauges, it is often necessary to perform two cold treatments. Cold treatment must be tempered or aged to eliminate the stresses formed and stabilize the newly formed martensite structure.
The workpiece does not need to be kept warm during the ice-cooling treatment, only when the heart reaches the cold agent temperature (generally 1 to 2 hours). After the ice-cooling treatment, the workpiece is taken out from the cold agent, and slowly warmed to room temperature in the air, and then tempered. The ice-cold treatment temperature is mostly in the range of -70 ° C to -80 ° C, and the temperature selected for the ice-cooling treatment is mainly based on the MS (the martensite transformation start temperature) and the Mf (the martensite transformation end temperature) temperature of the steel, The technical requirements of the parts are relevant. Ms < T < Mf. It is not the lower the temperature, the better, as long as the technical requirements are met. Low carbon alloy carburized steel is mostly -70 ° C ~ -80 ° C.
The ice-cooling process has its own value. Machines that have been processed through the ice-cold process have other machines that cannot be compared to yours. For example, the air turbo refrigerator is manufactured according to the basic principle of compressed air expansion and refrigeration. Its characteristics are remarkable. First, the cooling speed is fast and the process temperature can be quickly reached. Second, the environment is non-polluting and the cooling medium is compressed air. Third, the operating temperature range is wide and there is no frost. Fourth, the freezer and low temperature box are separated for easy upgrading and transformation. The main thing is that it is easy to operate and easy to maintain.
The tool ice-cooling process is scientifically manufactured according to the chemical composition of the steel. These technologies are applied to tools , measuring tools and precision instruments, which not only improve the use value of the products, but also greatly improve the work efficiency.
Cobalt Carbonate,Cobalt Hydroxide,Cobaltous Oxide,Cobaltous Chloride
Quzhou CanWin New Material Co., Ltd. , http://www.canwinnm.com