论文部分内容阅读
根据金属的变形理论,工件表面在外力作用下,被滚压金属的原子间距离会暂时发生变动或晶粒间产生滑移,当外力达到一定数值时,被加工表面金属除产生弹性变形外还有塑性变形。由于塑性变形,不仅零件被加工表面的形状发生变化,而且其组织结构也发生变化,使金属被滚压层的组织变得紧密,晶粒变细。同时金属表面层内产生较大的压缩应力,使金属表层得到强化,提高了硬度,熨平了微观不平度(见图1)。降低了零件的表面粗糙度值,增强了零件的耐磨耐腐蚀性能,延长了零件的使用寿命。
According to the theory of metal deformation, the surface of the workpiece under the action of external force, the distance between the atoms of the rolled metal will temporarily change or slip occurs between the grains. When the external force reaches a certain value, the metal to be machined will deform elastically Plastic deformation. Due to the plastic deformation, not only the shape of the machined surface of the part is changed, but also the structure of the part is changed, so that the structure of the metal rolled by the rolling layer becomes compact and the grains become thinner. At the same time, a large compressive stress is generated in the metal surface layer, so that the metal surface layer is strengthened, the hardness is increased, and the micro unevenness is smoothed (see FIG. 1). Reduce the surface roughness of parts, enhances the wear-resistant parts corrosion resistance, extending the service life of parts.