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

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.