複合型CNC旋盤による加工での加工精度向上に関する研究 : フライス加工時における工作物挙動の解析と共振現象の回避

Abstract

This study deals with an analysis of workpiece behavior and optimization of machining conditions with regards to milling of a shaft having a small flexural rigidity using ball end mills. In this paper, in order to apply a previously developed cutting model to milling of shafts, geometric quantities such as contact region between the cutting edge and the workpiece surface, and distribution of undeformed chip thickness along the cutting edge, are analyzed. Cutting forces are calculated using the cutting model and an energy method. Then, the workpiece deflection is analyzed on the basis of calculated results of cutting forces. It is found that the cutting forces and workpiece deflection show an increase at the location where the tool axis reaches about half of the center line of the shaft. Analysis of the resonance frequency of the workpiece is performed, and the relationship between the rotational speed of the spindle and displacement of the workpiece is clarified.