气门摇臂铆接压机的动态仿真方法研究

摘要

In practice, the deformation of the parts of engine valve rocker pressure riveting machine may influence the riveting accuracy and the analysis with multi⁃rigid body model cannot meet the accuracy requirements. Therefore, ANSYS and ADAMS were used to build a rigid⁃flexible coupling model based on virtual prototyping technology and dynamic simulation was made. In order to solve the problem that it was difficult to simulate a system included plastically deformed objects, DEFORM⁃3D was used to analyze the de⁃formation of rivet in the riveting process and the “die load⁃compressed length of rivet” curve was gotten as the stiffness of a nonlinear spring to replace the rivet in ADAMS. This method makes the simulation close to actual situation and makes the results have guidance for control.%实际情况中气门摇臂铆接压机构件的变形可能会对铆接精度产生影响，多刚体模型难以满足分析精度要求，因此使用ANSYS和ADAMS建立刚－柔耦合虚拟样机模型对铆接压机构件进行动态分析。为解决ADAMS中难以对有物体发生塑性变形的系统进行仿真的问题，使用DEFORM⁃3D对压铆过程中铆钉变形进行仿真，以得到的“压模载荷－铆钉被压入长度”曲线作为刚度在ADAMS中建立非线性弹簧力代替铆钉。这种方法使仿真更接近实际，也使仿真结果对铆接压机的控制具有指导意义。