半固着磨具孔隙率的理论分析及验证

Theoretical Research and Verification of the Porosity of Semi-fixed Abrasive Tools

在分析划痕对加工效率的影响及对比游离磨粒、半固着磨粒加工特点的基础上,对半固着磨具中产生陷阱效应的重要参数之一——孔隙率进行了研究分析。建立了圆形磨具与直线边界和圆形边界的接触模型,分析了最大量纲一重叠深度与量纲一法向力/法向弹性接触刚度比值的关系。研究结果表明:圆形磨粒之间的接触状态远远优于圆形磨粒与直线边界的接触状态;半固着磨具成形后的直线接触边界需要经过修整来提高其整体性能;理论计算孔隙率与实测表层孔隙率比较接近;半固着磨具的抗剪强度可以满足研磨、抛光工艺的技术要求。

One of the most important parameters of trap effect was studied based on the analysis of the importance of uniform scratch and its effect on the polishing time, contact models between circle abrasive grain, line boundary and circle boundary were deduced to investigate the relations between engagement depth and the ratio of normal force to normal elastic stiffness. Theoretical research results show that semi-fixed abrasive tool should be conditioned after its compaction for the boundary between abrasive grain and line boundary is unstable, the contact status is stable for internal abrasive grain,predicted porosity value agree well with that measured in the experiment, the shear strength of semi-fixed abrasive tool can meet the demand of lapping and polishing processes.