Planejamento de produção diária de galvanizados por imersão a quente na USIMINAS

Abstract

In this work a problem regarding the production flow with simple machine set up of hot dip galvanizing line focusing in optimize the production sequences measured in days. The main characteristic of this production process is that both lines can produce only two types of products and only one type at a time, however, the set up time is high, besides the current way of production sequencing does nottaking into account cost impacts. During the field surveys, it was possible to observe that there is no support system for the production scheduling, and it is done manually. The objective is to provide the production control planning analyst a tool to assist in this task through a mathematical model that captures the characteristics that influence the decisions of production scheduling in order to carry out a production demand sequencing that minimizes the cost and prioritizes the customer deadline. It was used the AMPL, that is an algebraic modeling language, combined with the CPLEX solver as auxiliary tools to develop the simulator. The results show that the proposed model provides an optimal solution in all the scenarios presented and that it is possible to carry out a production demand sequencing whose objective is not simply to distribute the demand in days respecting the availabilities, but also to consider the costs involved in the process.