Structural Design And Optimization Of Transmission Mechanism With Multiple Constraints

Transmission mechanism is an important constituent of a mechanical system,because it is crucial not only to fulfilling the function of motion transmission and conversion,but also to ensuring smoothness and precision in transmission.For some of the mechanical systems,it might even be entitled to transmission of energy,including force and torque.As such,the design of this kind of mechanism is often a multiple constrained problem,involving constraints of motion,force,interference,transmission smoothness and stability,etc.The press is widely used for producing stamped parts for a variety of products,such as aerospace,electrical appliances,automobiles,military works,kitchenware,outdoor products,and so on.As a core component,its mechanism is critical to the production of high-quality parts.The design of this mechanism is a typical multiple constrained problem.As such,this thesis takes the design of the transmission mechanism in press as an example to study its structural design and optimization method,so as to provide a prototype design methodology for the design and development of similar mechanisms.The thesis first introduced the relevant background and concept,and based on this,presented an overall plan of the press line and its layout,with which the feeding robot operation process was determined.Subsequently,the main drive mechanism of the press was designed,where SOLIDWORKS software was employed to create three-dimensional model of the six-bar linkage transmission mechanism.The driving mode selection of the main drive,the transmission scheme design and the design calculation of key parts of the mechanism were also carried out.A simplified three-dimensional model of the six-bar linkage was employed to the calculation and analysis of kinematics and dynamics of the manipulator,and the kinematics and inverse solution of each bar were obtained by using the Motion function of the software to simulate the slider movement.The results from the displacement velocity and acceleration curves demonstrated the smooth movement of the slider.Besides,the force and strength of the mechanism were also analyzed with the Simulation module of the software,and its optimization was also conducted.As a result,the stability of the transmission mechanism was also ensured.Overall,the thesis presented a complete design process of the transmission mechanism in the press,which can be used as a guiding reference for other similar multi-constraint mechanism design problems.