A universal pocket plunge milling method to decrease the maximum engagement angle

Huang, N.1, a; Krebs, E.2, b; Baumann, J.2, c; Wirtz, A.2, d; Jaeger, E.M.2, e; Biermann, D.2, f

1)
State Key Laboratory of Mechanical System and Vibration, School of Mechanical Engineering, SJTU, Shanghai, China AND State Key Laboratory of Manufacturing and Equipment Technology, School of Mechanical Science and Engineering, HUST, Wuhan, China
2)
Institute of Machining Technology, TU Dortmund University, Baroper Str. 303, D-44227 Dortmund, Germany

a) nhuang@sjtu.edu.cn; b) eugen.krebs@tu-dortmund.de; c) jonas.baumann@tu-dortmund.de; d) Andreas.wirtz@tu-dortmund.de; e) eva.jaeger@tu-dortmund.de; f) dirk.biermann@tu-dortmund.de

Abstract

Plunge milling has been proven to be an efficient strategy for machining of pockets with deep cavities and difficult-to-cut material. Previous work generates the plunge toolpath mainly by controlling the radial cutting width within the given value. However, uneven tool engagement angles may lead to excessive tool load and tool load fluctuations, which has a negative influence on tool life. In this study, a universal plunge milling toolpath generation method is proposed to improve tool life by decreasing the maximum tool engagement angle. A series of concentric circles with constant radius increment is utilized to generate a toolpath with constant cutting radial depth. Center of the concentric circle is determined based on the pocket contour. New detailed algorithms to generate plunge toolpath for basic cases has been developed. An automatic pocket subdivision algorithm has been developed by dividing the pocket into several sub-regions that are easy to be machined. Without loss of generality, the method is applicable for both open and closed pockets. It also works for pockets with and without islands inside. The method is implemented and verified successfully by machining experiments. The results provide strong evidence that proposed method can reduce the maximum engagement angle over the entire toolpath and thus improve the tool life.

Keywords

Plunge milling; Pocket decomposition; Concentric circle; Engagement angle; Toolpath planning

Publication

Journal of Manufacturing Science and Engineering, (2020), doi: 10.1115/1.4047059