Cutting Speed Optimization in High Speed Turning

Abstract

In this paper, two optimization methods of determination optimal and economical speeds are presented: a graphical and an analytical one. Coefficients of Taylor, roughness and tangential cutting force models have been extracted from an experimental study. The later takes into accout a turning operation of an AISI 4340 steel bar with two carbide inserts named “A1” and “A2” with tungsten covered by a couch of TiN, Al2O3 and TiCN, one carbide insert named “B” with tungsten doubly-covered CVD (Chemical Vapor Deposition) with  Al2O3 and TiN and one ceramic named “C” with Al2O3 and TiCN. The constraints taked into account in this work have been maximum power of the lathe, admissible values of spindle speeds described on the machine and workpiece dimensions. The results of the two methods have been similar. The analytical method has been automated in a Visual-Basic application which permit to give time, production cost of workpiece, optimal, economical, admissible, maximum speeds and also used speed and feed considering operator intentions (cutting at short time or with less cost) with an imposed roughness.
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