圆坯感应加热过程温度分布及磁场规律的研究

The Investigation of Round Billet Temperature and Magnetic Field Distribution and Variation During Induction Heating Process

通过数值模拟的方法计算了圆坯感应加热过程的温度分布情况,研究了线圈匝数、聚磁体、坯料表面与空气的对流换热等因素对感应加热的影响。结果表明,线圈匝数对坯料温度分布有较大的影响,为了得到相对均匀的温度分布需选择合理的线圈匝数;感应加热中采用聚磁体,可显著提高坯料端部温度,消除坯料端部温度偏低的现象;同时,计算了感应加热过程的磁场分布,解释了坯料温度分布和变化的原因,并提出控制感应加热过程坯料温度的合理措施。

Round billet temperature during induction heating was calculated with numerical simulation method in present work,the factors affecting induction heating were studied,such as coil turns,the poly magnet,the convective heat transfer between billet surface and surrounding environment,etc. It was found that coil turns played an important role in round billet temperature distribution,and it was necessary to choose reseaonable coil turns in order to get a relatively uniform temperature distribution. Using magnetic flux concentrator could greatly improve the billet end temperature,and the phenomena of low temperature in billet end would be elimiated. Besides,the billet temperature would be reduced by convective heat transfer in billet outsurface and air,longer time was cost to reache the target temperature. Meanwhile,the magnetic field during billet induction heating was calculated,it was used to explain billet temperature distribution and variation,the reasonable measures to control billet temperature during induction heating process were proposed.