Optimum Cutting Conditions for Turned Components

Abstract

This paper describes the procedures used in a technologically orientated numerically controlled (NC-) system to determine the optimum culling conditions automatically for turning, drilling, grooving, threading and parting-off operations. In rough turning, the optimum depth and feed combination is determined using a direct search procedure on the allowable depth/feed region for chip control. The system determines the optimum depth of cut, feed and velocity for each pass in multi-pass turning on the basis of a user-selected objective criterion and a number of technological limitations that may apply to the process, such as machine power, dynamic instability, allowable range of depths and feeds for the tool and workholding limitations which include axial slip, circumferential slip and component throw-out. A user-friendly manual option is also provided which allows the user to specify the cutting parameters. Examples are given to illustrate how these procedures determine the optimum cutting conditions. A comparison between the machining costs and times using cutting conditions obtained from handbooks and the aforementioned procedures shows that for all the operations considered, there are cost and time savings when the cutting conditions obtained by the latter are used.

On machining of hardened AISI D2 steel with PCBN tools

“…Finally, an attempt is made to present empirical tool life and cutting force relations that can be used in an optimisation procedure for hard turning similar to the one described in Ref. [22] for conventional turning.…”

“…This form of tool life equation has been used in an optimisation procedure for conventional turning [22]. From the method of least squares, the constant A t and exponents b t and c t of Eq.…”

Development of hybrid predictive models and optimization techniques for machining operations

“…Early efforts on machining optimization methods are largely based on the traditional low cost or high productivity criteria. A large domain of published work found in the literature shows the continued and extensive attempts to develop various optimization techniques for machining processes during the last three decades [24][25][26][27][28][29][30][31][32]67,68]. Most commonly considered optimization objectives include production time, machining cost, profit rate, material removal rate, a combination of these, and tool usage.…”

Computer Aided Constrained Optimisation of Cutting Conditions in Drilling Operations on a CNC Lathe by Using Geometric Programming

“…Arsecularatne [2] and Filiz, Sonmez, Baykasoglu, Dereli [3] studied the constrained optimisation of cutting conditions in drilling by using minimum cost as optimisation criteria. They used the torque available from machine too~drill buckling, drill strength, axialcircumferential slips in chuck as the constraints.…”