A Method for Evaluation of Vertical Milling Cutter Bottom Edge Wear Based on Equivalent Plane Wear Zone

Abstract

Aiming at the problem that it is difficult to accurately measure the bottom edge wear value of vertical mills, a method for evaluation of bottom edge wear based on equivalent plane wear zone (called reconstruction method) is proposed. For four-edge vertical mills, a mapping model of the boundary points of the wear zone from 2D to 3D is established to realize the 3D reconstruction of the wear zone; the geometric transformation is applied to complete the plane representation of the reconstruction points of the wear area of the first and second flank of the bottom edge; based on the construction of the equivalent plane wear area of the bottom edge, the evaluation of milling cutter wear is completed. In the experiment of milling hardened steel parts with a cemented carbide milling cutter, the wear area image with a milling time of 42 minutes is selected. The results show that, compared with the direct measurement method, the width of the wear area obtained by the reconstruction method increases by about 8.0%-11.1%, and that the area increases by about 6.9%-10.7%; the wear of the second flank of the bottom edge has an obvious influence on the evaluation. The results of this study clarify the feasibility and accuracy of the method for reconstruction of the worn area