Kinetostatics And Dynamics Analysis Of The Six-link Toggle Mechanical Press

Compared with the slider-crank mechanism, the multi-link mechanism has the advantages of high controllability,high precision,high efficiency,low noise,small vibration, long service life. The multi-link mechanism can realize complex forming technology,and meet the requirements of a variety of stamping operation. It has been widely used in the fields of automobile, aerospace and electronic communication.The six-link toggle mechanical press is taken as the research object.The kinematics,kinetostatics, dynamics and elastic dynamics of the press are researched thoroughly.The main research contents are as follows:First of all, kinematics analysis of the six-link toggle mechanical press was carried out. The kinematics equation was established by the complex vector method,and the mobility of the six-link toggle mechanical press is analyzed, the range of link length is obtained, the initial link length is determined. The Matlab was used to calculate the kinematics of the press. The displacement, velocity and acceleration curve of the hammer are obtained. Based on Adams, the kinematics of the press mechanism was simulated and analysed and the kinematics analysis was proved to be correct.Secondly, kinetostatics analysis of the six-link toggle mechanical press was carried out. The stress of each member is analyzed. The kinetostatics model was established by D’Alembert principle. The Matlab was used to calculate the kinetostatics of the press, the constraint force of the kinematic pairs and the balance torque of the crank under the condition of no load and load were obtained. Based on Adams, the dynamic static of the press mechanism was simulated and analysed. Then,the kinetostatics analysis was proved to be correct.Then,rigid body dynamics analysis of the six-link toggle mechanical press was carried out. The angular displacement of the crank was chosen as the generalized coordinates. The kinetic energy and potential energy of the press are listed. The generalized force was determined. The rigid body dynamics model was established by Lagrange equation. The Matlab was used to calculate the rigid body dynamics of the press, the driving torque of the crank under the condition of no load and load were obtained. Based on Adams, the rigid body dynamics of the press mechanism was simulated and analysed. Then, the rigid body dynamics analysis was proved to be correct.Finally, elastic dynamics analysis of the six-link toggle mechanical press was carried out. The finite element method is used to divide the flexible component into several beam elements. The kinetic energy and deformation energy of the unit are calculated. The elastic dynamics equation of the element was established by using the Lagrange equation. The constraint conditions of the system were established. The elastic dynamics equation of the system was obtained by assembling the elastic dynamic equations of the element. The Newmark method was used to solve the elastodynamic equation, and the variation law with time of the kinematic error of the system, the stress of the link and the natural frequency of the system are analyzed.