Optimization Model for Machining Processes Design in Flexible Manufacturing Systems

Abstract

Engineering machining processes realized in flexible machining systems (FMS) is a highly complex engineering task, especially since it encompasses complex optimization procedures apart from engineering. For a broad array of different workpieces produced in different series it is very difficult to engineer a manufacturing process for attaining maximum processing productivity with minimal production costs. The paper presents a developed post-processor model enabling automatic generating of the NC code for all NC programs executed simultaneously in the production process on a greater number of machining centers. The model engrosses the different variants of tools in a machining center magazine, a different combination of elements of the machining mode, possibility of the most favorable layout of workpieces on palettes, compliance with the technological requirements in terms of simultaneous tool changes in machining center magazines, the required total processing time and minimal production costs. To that aim has been developed the postprocessor generator, as a program and software system, enabling all NC programs to be automatically updated based on the set up optimization strategy from tool changes, changes in cutting mode elements and technological operations. Such updated NC programs contain optimal technological parameters and provide minimal costs of production while at the same time the maximum utilization of tools during manufacture at an exactly specified time.