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| Method for heating and cooling in precision casting heat treatment |
| Dongying pony precision Metals Co., ltd 2016-11-09 13:34:05 Author:SystemMaster Source: Font size:[Large][Middle][Small] |
Selection and control of heating temperature is the most important issue to ensure the quality of heat treatment in vacuum heat treatment of precision casting parts. The heating temperature varies with the purpose of the treated metal material and heat treatment, but generally it is heated to a temperature above the temperature in order to obtain the high temperature structure. Another change will take some time, so when the metal surface to meet the requirements of the heating temperature, still need to maintain a certain temperature at this time, inside and outside temperature, the microstructure change completely, this time called the holding time. Using high energy density heating and surface heat treatment, the heating speed is extremely fast, generally there is no heat preservation time, and the heat preservation time of chemical heat treatment is usually longer.
Cooling and heat treatment is an indispensable step in the process, the precision casting industry cooling method for different casting process and heat treatment process, mainly to control the cooling rate and the cooling speed in general annealing is the slowest, the cooling speed of goods faster, faster cooling rate of quenching. Single because of different kinds of steel have different requirements, such as empty hard steel can use the same normalizing the cooling speed of quench
Master the method of heating and cooling, in the use of vacuum quenching furnace for heat treatment will have a half work times the effect of oh. Learn it quickly! |
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