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The heat treatment is an important means to improve the mechanical properties of metallic materials and their manufacturing quality. With the development of industrial technology in recent years, the performance of metal materials more higher requirements, heat treatment technology toward the development of high-quality, efficient, energy-saving, pollution-free direction. Resistance furnace is heat-treated to produce the most widely used heating equipment, so the heating process measurement and control of the average temperature has become a key technology, spurred more actively study the method of the control thermal processing process. Resistance furnace heat treatment process usually presents large lag, nonlinear, time-varying characteristics, and large trolley resistance furnace space heating, the temperature field in the presence of strong coupling site strong interference, a great deal of uncertainty to the temperature control seriously affect the quality of the product. Therefore, the successful resolution of the resistance furnace temperature control to meet the requirements of heat treatment process has important practical significance. This paper first introduces the status quo of China's resistance furnace temperature control, development trends and problems, and focus on the problems faced by the the large trolley resistance furnace heat treatment process temperature control. Resistance furnace temperature control lies in two aspects of temperature measurement and temperature control. The temperature measurement is the temperature control on the basis of this technology is relatively mature. However, due to the more and more complex control object, many problems still exist in temperature control. This paper presents and industrial electric resistance furnace temperature computer control system design and system analysis, PID control algorithm. Principles of computer control system is described in detail in the article, from the on-site measurement of physical parameters, signal conditioning data acquisition, data analysis, data processing, and finally to the implementing agencies constitute a complete temperature measurement and control system. Finally, we study the electric furnace temperature control of the electromagnetic compatibility (EMC) issues. For the problem of electromagnetic interference (EMI), the corresponding suppression measures and analyzes the the signal filter design method. EMC-based adaptive PID control algorithm control system with real intelligence and flexibility, with automatic detection, real-time data acquisition, processing and control results display function, received high control accuracy, high-quality performance of heat treatment pieces of heat treatment process of guiding significance.
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