非円形輪郭切削に関する研究(第1報) : 逆伝達関数補償法の適用

概要

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This paper describes a newly developed lathe for machining numerious non-circular profile article with high accuracy and high efficiency. In general, the machining of non-circular profile articles, such as camshafts and rotary engines, has conventionally been carried out by means of a copying lathe. This method sets upper bounds to machining speed owing to mechanical factors. In order to machine a non-circular profile object by a lathe with high efficiency, a lathe has been developed whose the cutting tool is positioned in-phase with the rotation of the spindle by the use of an electro-hydraulic servo-mechanism controlled numerically. When the speed of the spindle is increased to improve machining efficiency, the positioning of the cutting tool tends to become out of phase with the rotation owing to the delay caused in the servo-system. The inverse transfer function compensation, which is a kind of feed-forward control, has been applied to the system in order to overcorne the problem of the delay. And application of this compensation has enabled improvement in positioning accuracy of ±0.5 mm to ±0.1 mm at a spindle rotation of 180 rpm. This result and some examples of the products machined by the developed lathe are shown in the paper.
公益社団法人精密工学会の論文
1988-01-05