Machining, Measurement, and Control Laboratory

Intelligent Endmilling System and Its Application to Internal Cylindrical Machining with Spiral Curves
Yoshiaki Kakino (Kyoto University)
Atsushi Matsubara (Kyoto University)
Iwao Yamaji (Kyoto University)
Hidenori Saraie (Mori Seiki Co. Ltd.)
Makoto Fujishima (Mori Seiki Co. Ltd.)
Hirotshi Otsuka (Oita Industrial Research Institute)
Hideo Nakagawa (OKK Co. Ltd.)

In this paper, the intelligent endmilling system with canned cycle for part machining is described. At first an endmilling process design system using machining features and canned cycles is established. In this system the pocket machining is taken up as a typical example and divided into canned cycles such as Helical boring Spiral Trocoid Corner machining After that the control system keeping cutting force constant is developed on Spiral machining which has relatively mild geometric changes compared to other canned cycles. At this time we compare two algorithms which 1) change feed rate along the path while keeping the radial depth of cut constant and 2) change radial depth of cut while keeping feed rate constant. It is verified that high-speed high-efficiency endmilling is possible while preventing serious damage to tool tips by using both algorithms. Moreover no big difference is observed between the case where the feed rate was changed and the case where the radial depth of cut was changed on a machine equipped with a CNC with a high speed-response capability.

Keywords:   Intelligent endmilling system, canned cycle, process design, machining feature, spiral curve, keeping the cutting force constant