基于磨损区重构的圆柱立铣刀周刃磨损评价方法

Evaluation method of the circumferential edge wear of the cylindrical vertical milling cutter based on wear zone reconstruction

针对周刃磨损值测量误差大的问题,提出了基于磨损区重构的铣刀周刃磨损的评价方法。从视频显微镜获取的磨损区图像出发,建立三维重构与曲面展开映射模型,实现周刃后刀面磨损区的三维重构以及螺旋面的近似平面展开;应用几何变换,实现第1、第2后刀面磨损区的平面表示及其共面表示,从而得到等效平面磨损区。通过对等效平面磨损区的分析,得到后刀面磨损宽度和磨损面积,进而对铣刀周刃磨损进行评价。在对四刃铣刀的磨损(切削时间为57 min)进行实证研究后发现用重构法得到的磨损宽度、面积相比于用直接法平均增加了0.16 mm和0.067 mm^(2),增率为17.0%和14.9%。研究结果表明了重构法的可行性和准确性。

In order to solve the problem of large error in the measurement value of circumferential edge wear,an evaluation method of the circumferential edge wear of milling cutter based on the reconstruction of wear zone was proposed.Based on the image of the wear zone obtained by video microscope,a 3D reconstruction and surface expansion mapping model were established.Then the 3D reconstruction of the wear zone of the flank wear zone of circumferential edge was completed,and the approximate plane expansion of the spiral surface of the perimeter edge was completed.The geometric transformation was used to complete the representation of the first and second flank wear zones in their respective planes and their coplanar representation so as to obtain the equivalent plane wear zone.Through the analysis of equivalent plane wear zone,the wear width and wear area of the flank were obtained,and the accurate evaluation of the circumferential edge wear was further finished.The empirical study on the wear of the four-edge milling cutter(the cutting time is 57 min)found that the average wear width and area obtained by the reconstruction method were 0.16 mm and 0.067 mm^(2) higher than those obtained by the direct method on average,and the increase rates were 17%and 14.9%.The results show the feasibility and accuracy of the reconstruction method.