工作機械の設計評価の研究

小型化を指向した設計パラメータ評価

抄録

This paper applies the method of robust design to machine tool design to propose a new design tool which can show some design suggestions at the early design stage. As a design evaluation example, the paper focuses on an ultra miniature that provides significant for energy and space saving. The approach combines an analytical procedure representing the machining motions of a machine tool (form-shaping theory) with procedures for robust design. The effort identifies the design parameters of a machine tool that significantly influence the machining tolerance and leads to general design guidelines for robust miniaturization. Further, this research applies the Taguchi method to the form-shaping function of a prototype miniature lathe. The analysis addresses five machine tool dimensions as control factors, while treating local errors in the machine structure as noise factors. The robustness study seeks to identify the importance of each factor in improving performance of the machine tool. The result shows that the design of the feed drive unit affects the performance most significantly. Among the local errors, straightness error of the same feed drive unit has a critical importance.