Simulation of Numerical Control Operations Using GEMS (General Manufacturing Simulator), An Industrial Application

摘要

Formulation of a prototype, micro-level GEMS model and the data generation used to stimulate numerically controlled production machining operations are reported. GEMS is a complete simulation language capable of simulating generalized piece-part manufacturing systems. In the field test conducted at Hughes Tool Company in Houston, Texas, a prototype GEMS micro-level model was developed for use in machining of tool point pins. The microleveling concept is explained together with each step of the process including sample calculations required to develop input data. A probabilistic tool life model under variable operating conditions was developed along with a technique for selecting the most economical cutting conditions. The effects of changing such factors as operating parameters, tooling material and configuration, tool change policy and sequence of N/C machining steps on production cycle time, multi-pass operations, cost per component, machine loading, and part flow characteristics are detailed. The GEMS network is described along with results of seven computer simulation runs. The field study successfully demonstrated the industrial use potential for GEMS for simulating numerically controlled production machining operations.