对于厚度较大且硬度要求较高的零件,在油中淬火很难达到硬度要求。如在快速冷却介质中淬火,由于零件表面和中心之间温差大,极易引起大的应力,造成零件变形、开裂,从而导致零件报废。我们在多年的热处理生产实践中,逐步摸索出一套经验,就是采用断续冷却法降低厚件废品率。 For thicker parts with higher hardness, quenching in oil is difficult to achieve hardness requirements. As quenched in rapid cooling medium, due to the large temperature difference between the surface and the center of the part, it can easily lead to large stress, causing the parts to deform and crack, resulting in scrapped parts. We have many years of heat treatment in production practice, and gradually find out a set of experience is to use intermittent cooling method to reduce the thickness of thick pieces.