Optimization and graphical representation of machining conditions in multi-pass turning operations

摘要

This paper describes a procedure to calculate the machining conditions, such as the cutting speed,feed rate and depth of cut for turning operations with minimum production cost or the maximumproduction rate as the objective function. The optimum number of machining passes and the depth ofcut for each pass is obtained through the dynamic programming technique and optimum values ofmachining conditions for each pass are determined based on the objective function criteria by searchmethod application to the feasible region. Production cost and production time values are determinedfor different workpiece and tool material for the same input data. In the optimization procedure, theobjective functions are subject to constraints of maximum and minimum feed rates and speedsavailable, cutting power, tool life, deflection of work piece, axial pre-load and surface roughness. Bygraphical representation of the objective function and the constraints in the developed software, theeffects of constraints on the objective function can be evaluated. The parameters that are assumed tobe most effective in determining the optimum point can easily be changed and the revised graph canbe inspected for possible improvements in the optimum value.