Abstract
In this paper, experimental investigation and numerical simulation on heating process of small-sized workpieces in vacuum heat treatment furnace have been conducted. The proportional-integral-derivative (PID) control algorithm was employed for the temperature control of the numerical heat transfer model. Compared with the experimental data, the numerical results were validated. The computational maximum temperature difference of workpieces agreed well with the measured ones. In order to develop a new heating schedule for efficiently and uniformly heating loads, effects of heating rate, preheating rate and preheating temperature on heating performance have been researched. The results show that the maximum temperature difference decreases as the heating rate and preheating rate decrease appropriately. It is also found that decreasing preheating temperature can reduce the temperature difference of first-stage but increase the one of second-stage. Based on the results, an optimum heating process is proposed, through which the temperature difference within the workpiece drops below 50 °C during the whole heating schedule.
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