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提出了在实际生产中预防大直径薄壁环易变形的措施和对变形过大工件的校正方法，并对该零件在淬火前经过和不经过细化退火两种工艺所得到的金相组织进行了对比，强调在４５铸钢零件热处理工艺中必须首先对零件进行细化退火
The measures to prevent the deformation of the large-diameter thin-walled ring in actual production and the correction method of the excessive deformation of the workpiece are put forward. The metallographic structure of the part obtained before and after the quenching process is compared , Stressing that in 45 steel parts heat treatment process must first refine the parts annealing