Optimization Design And Finite Element Analysis Of Elbow-Bar Mechanism Of Moulding Machine

With the rapid development of modern science and technology, high speed, high precision and high efficiency have become the most important trend of current moulding machine. The velocity of moulding machine made in China is lower compared with moulding machine abroad.Based on the theory of mechanical optimization and finite element analysis , elbow-bar mechanism of the MP1040B moulding machines made by Beiren Group is investigated in the dissertation. Firstly, a kinematic model representing the bar mechanism is built and the nonlinear system of equations is solved through the method of gradient. Meanwhile, the angular displacement, angular velocity, angular acceleration and the corresponding curves of each component in a motion period are obtained. Kinetics analysis is performed without taking into account the nonlinear factors (e.g., friction), and the analysis about force of each joint point is put forward when different diecutting force is loaded. The geometry models of all components of the elbow-bar mechanism are built by using Pro/Engineer to obtain the calculated mass and inertia of these components. Optimal design with three variables is then done to the elbow-bar mechanism of the MP1040B moulding machine by utilizing the method of punishing function for constraint problems and variational scale for unconstraint problems. The optimal target function is the maxium of gradient in one work travel for the moulding plank of the elbow-bar mechanism. The result shows that the maximal gradient of moulding plank in one motion period declines by 25.7ï¼… after optimization,and the angular acceleration of the bottom moulding plank decreases greatly. Clearly, it can be seen that kinetics performance of the elbow-bar mechanism improves. At last,because the linkage is important and easily damaged relative to other components for the diecutting mechanism,it is the reseach object of finite element analysis in this paper. The finite element analysis is performed byusing ANSYS software and the geometry model is constructed by utilizing Pro/E. Finite element analysis makes it clear that the strength of the linkage is enough when diecutting force is equal to 2 450 000N.