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基于Abacus大型有限元分析软件,对35Ni4Cr2MoA空心轴环形工件连续驱动摩擦焊温度场和变形进行了模拟,对摩擦和顶锻阶段的温度场及变形规律进行了分析,并采用热电偶分析法对连续驱动摩擦焊工件表面的热循环进行了实测。结果表明,在摩擦阶段,最高温度在圆环外侧,随焊接时间增加,接触面温度不断升高,高温区域逐渐扩大,1260℃左右时界面金属发生屈服而形成焊接飞边,界面温度处于动态平衡,稳定在1260℃附近;在顶锻阶段,随时间增加,界面温度逐渐降低,高温区域缩小,温度在径向呈均匀分布,焊接飞边和轴向缩量均较摩擦阶段增大;在整个焊接过程中,界面各点温度先快速升高,后保持稳定,最后逐渐下降。热循环模拟结果与实测结果吻合较好,所建立的摩擦焊数值模型是可靠的。
Based on the Abacus large-scale finite element analysis software, the temperature field and deformation of the continuous-driven friction welding of 35Ni4Cr2MoA hollow shaft circular workpiece were simulated. The temperature field and deformation of the workpiece during the friction and upsetting stage were analyzed. The thermocouple analysis The thermal cycles that drive the friction welding workpiece surface were measured. The results show that in the friction stage, the maximum temperature is outside the annular ring. With the increase of welding time, the temperature of the contact surface increases continuously and the high temperature region expands gradually. At 1260 ℃, the interface metal yields and forms the welding flash and the interface temperature is in dynamic equilibrium , Stable at around 1260 ℃. At the stage of upsetting, with the increase of time, the interfacial temperature gradually decreases and the high temperature region shrinks. The temperature distribution in the radial direction is uniform, and the welding flash and axial shrinkage increase more than the frictional stage. During the welding process, the temperature of each point in the interface rapidly increases first, then remains stable, and then gradually decreases. The results of thermal cycling simulation agree well with the measured results. The numerical model of friction welding established is reliable.