高速磨削砂轮磨损对磨削表面质量的影响研究∗

摘要

基于陶瓷CBN砂轮对渗碳钢20 CrMnTi开展了高速外圆磨削试验。在外圆磨削余量和工艺参数固定的情况下对工件进行连续磨削，以工件上的磨除体积为砂轮磨损指标，考察了砂轮磨损对工件表面粗糙度、残余应力、表层金相组织和显微硬度变化的影响。实验结果表明工件表面粗糙度会随着砂轮磨损而上升，表面残余应力随着砂轮磨损逐渐呈现拉应力的趋势，磨削表面会出现回火软化变质层。该结果可为进一步研究高速磨削机理及优化工艺参数提供依据。%Process tests of 20CrMnTi carburizing steel in high speed cylindrical grinding were conductedby using ceramic bond CBN wheel. Continuous grinding on the work-piece under a constant external cylindrical grinding allowance and parameters was carried out, based on this experiment the influence mechanism of grinding wheel wear on the work-piece surface roughness, surface residual stress, microstructure and surface micro-hardness change has been analyzed. It is found that the work-piece surface roughness is increased with an increase of grinding wheel wear, but reduced with surface residual compressive stress, and grinding sur-face temper soften the metamorphic layer. Experimental result provides a basis for further research on high speed grinding mechanism and optimization efficiency.