论文部分内容阅读
众所周知,钢制零件经过热处理后,或多或少地总要产生一些变形。引起变形的原因是热应力、组织应力以及附加应力综合作用的结果。其中,附加应力是由于钢件表面和心部组织结构的不均匀,以及钢件内部弹、塑性变形的不一致而形成的内应力。这种应力比较复杂,但作用并不十分明显,故可以不予考虑。根据应力状态与变形规律可知:单纯热应力引起的变形是使工件趋向球形,即长度缩短、直径涨大、表面中部
As we all know, after the heat treatment of steel parts, more or less always have some deformation. The cause of deformation is the result of combined effects of thermal stress, tissue stress and additional stress. Among them, the additional stress is due to the uneven surface structure and the heart of the steel structure, as well as steel internal elastic, plastic deformation caused by the inconsistency of the internal stress. This stress is more complicated, but the effect is not very obvious, so it can not be considered. According to the stress state and deformation law we can see: simple thermal stress caused by the deformation is to make the workpiece tends to spherical, that is, the length of shortening, the diameter rose large, the middle of the surface