我厂生产的 SN10少油断路器中的滚动触头,采用冷挤压工艺加工,冷挤压加工的凸凹模为 Cr12钢,模具寿命一般为3000～8000件,失效形式为开裂。由于零件的生产批量大,模具不能满足需要。为此,我们进行等温淬火复相热处理的试验。1.加热温度及保温时间的确定为确保淬火硬度,将加热温度定为1000℃(奥氏体晶粒为10级)。为了使高温区加热时间尽量缩短, I plant the SN10 less oil circuit breaker in the rolling contact, the use of cold extrusion process, cold extrusion processing of punch and die for Cr12 steel, die life is generally 3000 to 8000, the failure form of cracking. Due to the production of large parts, mold can not meet the needs. To this end, we conducted isothermal quenching complex heat treatment test. 1. Determination of heating temperature and holding time In order to ensure the quenching hardness, the heating temperature is set at 1000 ° C (austenite grade 10). In order to make the heating time of high temperature area as short as possible,