砂轮表面形貌定量评价及修整效果研究

Study on Quantitative Evaluations and Dressing Effectiveness for Surface Topography of Grinding Wheels

基于砂轮表面磨粒出刃面积,提出砂轮表面磨粒出刃面积率Sr的概念,在此基础上提出磨粒出刃度βd和磨粒出刃面积分散度δs两个指标来评价砂轮表面形貌特征。用滚轮修整器对树脂结合剂金刚石砂轮进行修整实验,分析了不同修整方式、修整深度和修整速比对βd和δs的影响。采用修整后的砂轮进行磨削实验,分析了不同特征参数的砂轮对磨削力和工件表面粗糙度的影响。研究结果表明,采用较小的修整深度、较小的修整速比,多次进给修整砂轮时,磨粒出刃度高、磨粒出刃面积分散度小,修整效果好。当βd为69.35%、δs为1 000μm2时,磨削力、表面粗糙度最小,表明砂轮磨削性能最好,证明修整质量最高。因此所提出的βd、δs两个指标能对修整后的砂轮表面形貌进行有效评价,且磨粒出刃面积的检测方法简单,检测效率较高。

Based on the grain protrusion areas of the grinding wheel surfaces,a concept of grain protrusion area ratio Sr was proposed.Then,two indexes,the degree of grain protrusion areaβd and the degree of grain protrusion area dispersionδs were proposed to evaluate the surface topography of the grinding wheels.The dressing experiments of resin bonded diamond grinding wheels were carried out with a roller dresser,and the effects of different dressing methods,dressing depth and dressing speed ratio on theβd andδs were analyzed.The grinding experiments were carried out on the dressed grinding wheels,so as to analyze the influences of the grinding wheels with different characteristic parameters on the grinding forces and the surface roughness of the workpieces.The results show that with the smaller dressing depth,the multifeed dressing processes and the smaller dressing ratio,then the degree of grain protrusion area is high,the degree of grain protrusion area dispersion is small,and the dressing effectiveness is good.Whenβd is of 69.35%andδs is as 1 000μm2,the grinding forces and the surface roughness are the smallest,which means that the grinding performance of the grinding wheels is the best,and the dressing quality is proved to be the highest.Therefore,the proposed indexesβd andδs may effectively evaluate the surface topography of the dressed grinding wheels,and the detection method of the grain protrusion areas is simple and efficient.