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绿色高效的新时期工业生产理念的推广,使得电磁感应加热技术在近年来得到了越来越广泛的应用。电磁场和温度场的相互耦合,给电磁感应加热过程的数值模拟带来了一定困难。有限元法、边界元法等数值分析方法:先后被应用到电磁场和温度场的分析中来,但由于此类算法的复杂性使得研究结果:无法实时的给予工业生产在线指导。本文基于已有的研究结论以及感应加热的特点,开发出一套感应加热温度控制系统。首先根据电磁感应加热的电磁原理,研究分析了轴型工件感应加热过程中各种发热机理,探讨了工件内涡流功率密度在加热不同阶段内的分布规律,然后建立了感应加热温度场的有限差分计算模型,模拟了温度场的变化过程,讨论了工件瞬态温度场的分布和变化趋势,最后基于Visual Studio 2008建立了感应加热温度计算机控制系统,采用PID控制器通过调节电源功率控制温升过程,并以彩色云图的方式实时展示温度场瞬态变化趋势,并基于DB2数据库建立了相应的生产过程数据管理系统。
Green and efficient promotion of the concept of industrial production in the new era, making the electromagnetic induction heating technology has been more and more widely used in recent years. The mutual coupling of electromagnetic field and temperature field brings some difficulties to the numerical simulation of electromagnetic induction heating process. Finite element method, boundary element method and other numerical analysis methods have been applied to the analysis of the electromagnetic field and the temperature field, but due to the complexity of such algorithms makes the research results: real-time online instruction can not be given to industrial production. Based on the existing research results and the characteristics of induction heating, this paper developed a set of induction heating temperature control system. Firstly, according to the electromagnetic principle of electromagnetic induction heating, the various heating mechanisms in the process of induction heating of shaft-type workpieces were studied. The distribution of eddy power density in different stages of heating was discussed. Then the finite difference of temperature field of induction heating The model was used to simulate the changing process of the temperature field. The distribution and trend of the transient temperature field were discussed. Finally, a computer control system of induction heating temperature was established based on Visual Studio 2008. The PID controller was used to control the temperature rise process , And displays the transient trend of temperature field in real time in the way of color cloud graph. Based on the DB2 database, a corresponding production process data management system is established.