一种基于等效平面磨损区的立铣刀底刃磨损评价方法

An evaluation method for bottom edge wear of vertical milling tool based on equivalent plane wear area

针对立铣刀底刃磨损值难以准确测量的问题,提出了一种基于等效平面磨损区的底刃磨损评价方法(称等效法)。面向四刃立铣刀,建立了磨损区边界点由二维向三维的映射模型,实现了磨损区的三维重构;应用几何变换,完成了底刃第一、二后刀面磨损区重构点的平面表示;在构建底刃等效平面磨损区的基础上,完成了对铣刀磨损的评价。在用硬质合金铣刀铣削淬硬钢件的实验中,选取了铣削时间为42 min的磨损区图像。结果表明:相比直接测量法,等效法获取的磨损区宽度增加了约8.0%-11.1%,面积增加了约6.9%-10.7%;底刃第二后刀面的磨损对评价影响明显。研究结果阐明了磨损区重构方法的可行性与准确性。

Aiming at the problem that it is difficult to accurately measure the wear value of the bottom edge of the vertical milling cutter,a method for evaluating the wear of the bottom edge(Equivalent method)is proposed.The mapping model from two-dimensional to three-dimensional of the wear zone boundary point is established for four edge end milling cutters,and the three-dimensional reconstruction of the flank wear zone was realized.The three-dimensional geometric transformation was used to complete the plane representation of the reconstruction points of the first and second flank wear areas of the bottom edge.On the basis of constructing equivalent plane wear zone of bottom edge,the evaluation of milling cutter wear is completed.An image of wear zone with milling time of 42 min was selected in the experiment of milling hardened steel with cemented carbide milling cutter.The results show that compared with the conventional direct method,the width of the wear zone obtained is increased by about 8.0%-11.1%,and the area is increased by about 6.9%-10.7%by the equivalent method.The wear of the second flank face of the bottom edge has obvious influence on the evaluation.The research results clarify the feasibility and accuracy of the equivalent method.