Dynamics Analysis Of Variable Cross-section Roll Forming Machine With Damping Effection

With the development of science-technology, the requirement of highly automatic Mechanical equipment with high speed, high efficiency, high precision is becoming more and more urgent in the industry, agriculture and other industries. To achieve this goal, the dynamic design of demand should be done. The premise of dynamic design is to further study the motion state, velocity, acceleration and other performance index of mechanical equipment in the actual operation condition. Therefore, the dynamic analysis in the process of developing equipment is particularly important. For example, for the aerospace engineering, system dynamics problems will be more prominent with high efficient operation. In conclusion, dynamics of mechanical system is an important guarantee for the dynamic design of mechanical products with high precision, light weight and the inevitable demands.In this paper, under the support of the science and technology support program "High strength steel three-dimensional roll forming technology research and application"(item number is (2011BAG03B03)), a lot of work was done aiming at the developed3D roll forming production line prototype.First, do research on the mechanical system and the mechanical system dynamics, especially do research on the generalized coordinate of mechanical system, the principle of virtual displacement, stiffness and damping, then lay the theoretical foundation for establishing the dynamic equations of mechanical systems.Secondly, do the structural analysis and motion analysis of the "Double rack and pinion" structure in the variable cross-section roll forming machine. After the analysis of structural analysis and motion analysis structure of the whole forming machine, the dynamic equation of mechanical system was built with Lagrange method while the stiffness of the ball screw and the damp between ball screw and nut seat were considered.Last,caculate the mass and moment of inertia of parts and assembly with the help of the software Solidworks. Caculate the stiffness of the ball screw and the damping coefficient between ball screw and nut seat. Plot the Abaqus analysis data-time curve and test data-time curve with Matlab. Then the dynamic equations of mechanical systems can be solved with these parameters by Milne-Hamming and the curves of angular velocity of drive servo motor-time, angular velocity of motion servo motor-time, angular acceleration of drive servo motors-time, angular acceleration of motion servo motor-time and angular acceleration of ball screw-time can be obtained.The analysis and calculation of the results showed that the mechanical system dynamics equation established in this paper was correct,the obtained dynamic characteristics of the mechanical system was in line with the actual situation,then provide theoretical basis for the structure optimization and control system optimization of the forming machine.