Programação de produção em máquinas CNC para o curto prazo

Abstract

This study treat a practical application of scheduling jobs on flexible machines. The company in analysis is a metal working industry where a single flexible machine is used to manufacture precision parts. The machine is assisted by computer aided manufacturing softwares and allows automatic changing when processing a jobs. The machine has to be stopped and human intervention occurs when a job requires at least one tool which is not already in the tool magazine. Thus, the job scheduling and tool switching problem to minimize overtime and weighted tardiness costs consists of deciding the jobs to be processed in each day of the horizon, along with their processing order, given that the required tools to start a job must be on the limited capacity tool magazine. Integer programming models for the problem are proposed and numerical results on real data instances, and significant gainswere obtained with respect to the firms practice. Results show the potential to the use of the optimization model in the real-life setting and encourage to the development of methods for solving it.