Abstract: The geometry of pocket/cavity is generally complex, it is usually necessary to optimize tool sequence to improve the machining efficiency. As division of machining region plays an important role in optimizing tool sequence, to judge whether the machining region can be divided becomes a basic problem. In order to solve the problem, a concept of simplex region (SR) is proposed, and the recognition method of SR is put forward. The concept and definition of SR is given, which indicates SR is a special region that can be machined in high efficiency by only one tool. The recognition condition of SR is analyzed and demonstrated, and the recognition model is set up from the perspective of machining cost, based on which the recognition algorithm of SR is designed. A case study of SR recognition is introduced, which proves the theoretical and practical value of the presented concept and method.

Key words: Machining region, Milling, Pocket, Simplex region in pocket milling