钢球淬火后,在硬磨、精磨和精研等工序中加工时,经常产生烧伤。各厂钢球的烧伤程度,轻重不一。但到目前为止,在工艺上对解决烧伤尚无特别有效的方法。所以有些厂对普通级钢球制订了烧伤标准(二次回火条痕)。而对航空发动机、航空仪表等精密轴承用的高精度钢球,不允许有烧伤存在。 After quenching steel balls, hard grinding, grinding and lapping processes such as processing, often have a burn. The degree of burn of the ball factory, severity. So far, however, there has not been a particularly effective way to deal with burns technically. So some factories on the general level of the ball set a standard burn (secondary temper streaks). The aviation engines, aviation instruments and other precision bearings with high-precision ball, does not allow burns exist.