带非金属密封件的活塞杆焊接工艺研究

Study on Welding Technology of Piston Rod with Non-metallic Seal

针对一种带有橡胶密封圈的活塞杆零件,由于其体积小、高负载的特殊工况,通过一体式焊接结构提升活塞杆力学性能,所以要求在活塞杆焊接前,就需要把橡胶密封圈等非金属组件安装完毕,最后一步完成焊接工序。焊接工序采用氩弧焊工艺完成,焊接过程中的热量从焊缝处向外扩散,热量到达密封圈位置,当温度超过密封圈允许的最高温度后,会导致密封件失效。基于SE建模及仿真软件,通过数值模拟方法建立了一体式焊接结构的活塞杆焊接工艺方法的非稳态导热数学模型,通过研究不同导热结构下的活塞杆轴向热传导的温差,获得活塞杆表面在不同影响因素下温度变化规律。

For a piston rod part with a rubber seal ring,due to its small size and high load under special working conditions,the mechanical properties of the piston rod are improved through an integrated welding structure.Therefore,it is required to complete the installation of non-metallic components such as the rubber seal ring before welding the piston rod,and the welding process is completed in the last step.The welding process is completed by argon arc welding.The heat in the welding process diffuses outward from the weld and reaches the seal ring.When the temperature exceeds the maximum allowable temperature of the seal ring,it will lead to the failure of the seal.In this paper,based on SE modeling and simulation software,the unsteady heat conduction mathematical model of the piston rod welding process method with integrated welding structure is established through numerical simulation.By studying the temperature difference of the piston rod axial heat conduction under different heat conduction structures,the temperature change rule of the piston rod surface under different influence factors is obtained.