A Computer Aided Heat Treatment Planning System

摘要

A computerized heat treating planning system for batch furnace (CHT-bf) was developed and put into industrial application. The system aims to optimize thermal schedule and load pattern in the heat treating process of parts in batch furnace. In the system the arranged load pattern of parts is given. In this paper the simulation of random load pattern is highlighted. Random load pattern is very popular for carburizing, tempering and annealing in the heat treatment workshops. However, the heat transfer inside the random load pattern is very complicated. Up to date, very few studies can be found in this research field. In this paper the heat transfer in the random load pattern was solved by two methods under different conditions. The finite difference method is used for the case that there is measured experimental results. Base on the measured results an effective thermal conductivity can be calculated by the solution of inverse heat transfer problem, and then it is fed back to the new heat transfer calculation. For the condition that experiment is not available, an assumption is made that the parts are supposed to be arranged in order together. Then, conduction, convection and radiation heat transfer can be calculated separately by the models for arranged load pattern. The system has been put into industrial application. Two case studies are presented in the paper.