The finite element analysis software ANSYS was employed to simulate and analyze the electromagnetic induction heating process in the hot metal gas forming process .A finite element model of temperature field coupled with electromagnetic field had been established based on induction heating theory including Maxwell equations and temperature differential equation .Simulation results showed that with the increase of current frequency of electromagnetic induction coil , under the same heating time , temperature rising rate of steel tube increased continuously ,and the final temperature was raised further .With the increase of the current density of electromagnetic induction coil ,under the same heating time and current frequency of electromagnetic induction coil , temperature rising rate of steel tube increased continuously ,heating efficiency was improved effectively ,and the final temperature was raised gradually .With increase of interval space between steel tube and electromagnetic induction coil ,temperature of both outside and inner surfaces decreased gradually .The decreasing trend of outside surface temperature became gentler and gentler ,while the decreasing trend of inner surface temperature became sharper and sharper .%应用感应加热理论,利用麦克斯韦方程组和温度微分方程,建立了电磁场与温度场耦合的有限元数学模型,使用有限元分析软件ANSYS对热金属气压成型工艺中的电磁感应加热过程进行了模拟与分析.模拟结果表明:随着电磁感应线圈电流频率的提高,在相等的加热时间内,金属钢管的升温速度不断增加,且最终达到的温度也进一步升高.随着电磁感应线圈电流密度的增加,在相等的加热时间内、相同的电磁感应线圈电流频率下,金属钢管的升温速度不断增加,加热效率得到有效提高,且最终达到的温度也逐步升高.随着金属钢管与线圈的间隔增加,金属钢管内、外表面的温度均逐渐降低;外表面温度的降低趋势越来越平缓,而内表面温度的降低趋势则不断加剧.
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