A multipass optimization strategy for CNC lathe operations

Abstract

The optimization of cutting conditions has been and still is an active area of research since Gilbert's (1950) first work in machining economics. Many concepts and optimization procedures have been developed since then to obtain optimum conditions, taking into account as many influencing variables as possible. However, the use of these techniques in machinability data base systems, NC part programming systems and process planning systems so far has been very limited, even though there is an urgent need for such a technique. Existing optimization schemes do not necessarily give optimum machining solutions. Several works reported in the literature restricted multi-pass problems to two-pass problem so as to simplify the solution method or to treat them as single-pass problems. This paper describes the development of a methodology for an effective optimization of machining conditions of multi-pass lathe operations. The objective is to use the optimal even depth of cut strategy to simplify the solution method that determines near-optimum and practical solutions. The solutions obtained can be conveniently implemented in the part programmes of a CNC lathe. Such work can provide a wider acceptance and more practical application of machining economics in industry.