特小零件淬火时,当加热后尚未进入冷却介质前,温度就降低到临界点以下,常出现硬度不足的现象,需要返工重淬。重新淬火时,需进行正火或高温回火处理,使特小零件淬火费用增大。 后来,我们将需淬火的特小零件附着在材质相同的一般零件上,利用大 Special small parts quenching, when not heated before entering the cooling medium, the temperature dropped below the critical point, often appear the phenomenon of insufficient hardness, the need to rework heavy quenching. Re-quenching, the need for normalizing or high temperature tempering, so that special small parts quenching costs increase. Later, we will need to quench the special small parts attached to the same general material parts, the use of large