Dynamics Analysis Of High Strength Steel3D Roll Forming Production Line Prototype In Mechanical System

The thesis is selected from "Development of Three Dimensional Roll Forming Equipment", and also the sub-topic of the National Science and Technology Support Project—High Strength Steel Advanced Forming Technology and Its Application. The mechanical system dynamics analysis of high-strength steel three-dimensional roll forming production line prototype was carried out as follows:the establishment of prototype mechanical system dynamics equations, the solving of the dynamics equations by combining finite element simulation data and actual forming test data in engineering example, and analyzing of the solution results.Firstly, the forming process of variable cross-section roll forming is researched. The emphases of research are placed on the number of forming passes, forming roll angle design and the solution methods of forming defects.Secondly, the kinematic equations of the prototype mechanical system is established after completing motion analysis of "double rack-single gear structure", the key structure of prototype mechanical system. According to the process characteristic of variable cross-section roll forming, the racks motion control way is determined. This laid the foundation of the establishment of the system dynamics equations.Completing rotational inertia calculation of the prototype mechanism, the dynamics equations are established by using the electromechanical system dynamics method. In the system dynamics equations, the servo motors’ output torques are input, forming forces and torques of the process of TRIP590variable cross-section roll forming are load and the servo motions. Rotations of the rolls are the generalized coordinates. In the engineering example, the load force-time curve and the load torque-time curve are plotted out by using the data obtained from ABAQUS finite element simulation analysis. The data of output torques of the servo motors, the positions of the racks, the angular velocities of the roll driving servo motors are collected through the forming test. Finite element simulation data and test data are plugged into the system dynamics equations and system dynamics equations are solved out by using rectangular formula. Then the servo motor angular acceleration-time curves and angular velocity-time curve are obtained. According to the obtained rack position-time curve based on the system kinematic equations, the system dynamics equations are proved to be correct. Some conclusion complied with the dynamic characteristics of the prototype are obtained by analyzing the solution results of system dynamics equations. The research results provides theoretical basis for the development of the3D roll forming production line.