Optimal Structure Design Methodology for Compound Multiaxis Machine Tools-III – Performance Evaluation –
Masamitsu Nakaminami* , Tsutomu Tokuma* , Kazuhiko Matsumoto* , Sachinori Sakashita* , Toshimichi Moriwaki** , and Keiichi Nakamoto***
*Manufacturing Technology Department, MORI SEIKI CO., LTD., 201 Midai, Iga, Mie 519-1414, Japan
**Department of Industrial and Systems Engineering, Setsunan University, 17-8, Ikedanaka-machi, Neyagawa, Osaka 572-8508, Japan
***Department of Mechanical Engineering, Kobe University, 1-1 Rokko-dai, Nada, Kobe 657-8501, Japan
Compound multiaxis machine tools are developed for machining of high-value-added parts throughintegrating milling and turning operations. Due to the complexity of the configuration and the functional versatility required for a compound machine tool, machining accuracy, productivity, and return on investment (ROI) remain to be improved. Design methodology has been widely studied to design high-performance compound multiaxis machine tools. We evaluated their performance in this study, finding that a V guide effectively improves movement accuracy in the X, Y, and Z directions. Cutting tests conducted on the XY-plane, YZ-plane, and an inclined plane prove that tight circularity is achieved. Cutting cycle time for an identical part and the same part compared between conventional and new compound multiaxis machine tools showed the cutting cycle time is largely reduced. We also found that new compound multiaxis machine tools consume less electricity than a manufacturing system with equivalent productivity consisting of a 2-axis lathe and a machining center.