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采用热模拟试验研究了大截面圆柱工件在感应加热过程中的磁场和温度场分布,探讨了工件内的温度分布以及温度随时间的变化规律。试验结果表明:感应线圈中工件侧的磁场分布受工件内的涡流影响较大,由于磁场的叠加作用,工件表面磁场分布在相对于线圈的中部位置出现最大值。根据圆柱工件表面的温度变化规律得出3个阶段,第一阶段由于热量损失工件次表面温度最高;第二阶段工件温度达到居里点,工件的物性参数发生变化导致表面温度最高;第三阶段温度波峰依次波动向内传递。
The distribution of magnetic field and temperature field during induction heating of large cross-section cylindrical workpieces was studied by means of thermal simulation. The temperature distribution in the workpieces and the variation of temperature with time were discussed. The experimental results show that the magnetic field distribution on the workpiece side of the induction coil is greatly influenced by the eddy current in the workpiece. Due to the superposition of the magnetic field, the magnetic field distribution on the workpiece surface appears the maximum value relative to the central position of the coil. According to the rule of temperature variation on the surface of cylindrical workpiece, three stages are obtained. In the first stage, the sub-surface temperature of the workpiece is the highest due to heat loss. In the second stage, the temperature of the workpiece reaches Curie point and the physical property parameters of the workpiece change to cause the highest surface temperature. The temperature peaks are transmitted in turn.