Optimization of Multipass Turning With Constraints

Abstract

Single pass operation is not always the most economical or the most productive, for under such practical constraints as available horsepower, desired surface finish, minimum tool life and maximum permissible feed and speed, it can be shown that two passes, or sometimes even three passes, can be cheaper or take less production time. The objective of this paper is to illustrate when multipass turning is optimum and what ratios of rough to finishing depths of cut will give the optimum. The optimizing is determined by geometrical programming combined with linear programming. This mathematical approach can handle as many constraints as required, and any combination of them can be tight or loose at the optimum solution. Several examples are given to demonstrate the application of the method and the advantage of the process optimizing technique.