【摘要】 针对超声波焊接金属界面温度难以实时测量的问题,从能量角度建立了超声波焊接二维瞬态传热模型。利用ABAQUS计算了超声波焊接铝箔表面不同点处的温度历程,红外热像仪测量了焊接过程中铝箔表面温度历程曲线,铝箔表面最高温度计算值与实验值对比误差在5%以内,证明该模型具有良好的计算精度。再利用该模型计算了不同参数组合下超声波焊接铝箔界面的温度场,研究表明,超声波焊接铝箔界面最高温度不超过金属熔点的50%;得到了焊接界面最高温度与速度、声极振幅和法向压力的关系,其中,焊接最高温度随焊接振幅的增加而增加,随焊接速度的增加而减小。本研究结果对于揭示超声波焊接成型热过程机理及热机耦合应力过程的研究具有重要意义。更多还原

【Abstract】 Focusing on the difficulties of measuring the interface temperature of ultrasonic metal welding(USMW),it established a two-dimensional transient heat conduction model from energy conservation view. The temperature history during USMW at different points of the aluminum foil surface was calculated under certain welding parameters by this model and the results were consistent with the temperature history measured by the infrared thermal imager. The error between the calculating and experimental data was less than 5%. Then,the interface temperature of the USMW was calculated under different welding parameters by using the 2-D model. The results showed that the interface temperature of the USMW was not more than 50% of the melting point of the metal. The relationship of weld interface maximum temperature between the velocity,amplitude and normal force of soundtrode were got. The welding interface maximum temperature increased with the welding amplitude increasing,and reduced with the welding speed increasing. This work has important significance on the stress distribution during USW and thermal mechanical coupling mechanics when manufacturing metal matrix composites.更多还原