School of Mechanical Engineering Dongguan University of Technology, Dongguan, Guangdong, China.
PLoS One. 2023 Feb 2;18(2):e0280983. doi: 10.1371/journal.pone.0280983. eCollection 2023.
In this paper, the cam connecting rod system of the high-speed group vertical machine flipping shaping mechanism is the research object. In order to solve the key problem that the flipping shaping mechanism cannot accurately complete the action when the vibration of the mechanism is large. In this paper, the finite element method is used to construct the dynamic model of the connecting rod subsystem of the flipped shaping mechanism. And The dynamic model of cam roller subsystem is established by centralized parameter method. Based on the MATLAB Genetic Algorithm toolbox and using Newmark's method, the dynamic equations of the flipped plastic mechanism system are solved. The optimal parameters of the connecting rod of the mechanism, the cam profile curve and the swing power and swing torque of the mechanism at different speeds are analyzed. The results show that the speed and convex contour line are important factors affecting the performance of the mechanism. And the pendulum force (swing torque) is the main cause of the vibration of the mechanism on the frame. Therefore, the mechanism pendulum dynamic and the swing moment are selected as the objective functions of the optimization model. By selecting the node parameters of the sixth order spline motion law and the cross-section parameters of the connecting rod as the design variables. The cam linkage system is optimally designed to obtain the optimal value. Finally, the optimal design of the flipped shaping mechanism was analyzed and compared with the original mechanism.
本文以高速群座立式翻转整形机构的凸轮连杆系统为研究对象。为解决机构振动较大时翻转整形机构无法准确完成动作的关键问题。本文采用有限元法建立了翻转整形机构连杆子系统的动力学模型。并采用集中参数法建立了凸轮滚子子系统的动力学模型。基于 MATLAB 遗传算法工具箱，采用 Newmark 法求解翻转塑性机构系统的动力学方程，分析了机构连杆的优化参数、凸轮轮廓曲线以及机构在不同速度下的摆动功率和摆动扭矩。结果表明，速度和凸轮廓线是影响机构性能的重要因素。而摆动力（摆动扭矩）是机构在机架上振动的主要原因。因此，选择机构摆动态和摆动力矩作为优化模型的目标函数。通过选择第六阶样条子运动规律的节点参数和连杆的横截面参数作为设计变量。对凸轮连杆系统进行了优化设计，得到了优化值。最后，对翻转整形机构进行了优化设计分析，并与原机构进行了比较。
