Key Technologies And Virtual Prototypes On Six-link Mechanism Drawing Forming Press

Forging product is widely used in the aerospace,automotive,defense industry,chemical machinery and mechanical and electrical industries.As the main equipment for the production of forging,mechanical press is the main factor affecting the production process.In order to have good speed characteristics and significant force increase in the work area,using multi-link mechanism design.In the design of multi-link mechanism presses,increasing the design variables to be selected,taking into account the kinematic and kinetic requirements during the operation of the press,reasonably determining the objective function and the constraint conditions are still the main measures to improve the performance of the press.The 200 kN six-link mechanism deep drawing two-point servo press for the drawing process of sheet metal is taken as an example,and the key technical problems such as the optimization design of the six-link mechanism,the bottom dead center precision of the press and the slider’s lateral force of the six-link mechanism are studied.And the virtual machine is used to simulate the designed press.A design of offset six-link mechanism for deep drawing press is proposed.In order to improve the degree of vertical slide movement direction relative to the tab,considering the effect of kinetics of link rod and own weight,the forced state of the slider and the link rod are analyzed,and concrete measure to determine the slider’s lateral force is proposed.For the requirement of the bottom dead center precision in the design of press,the influence of mechanical pair clearance and size error is studied.The kinematics model of the six-link mechanism is established by using the complex number vector method,the influence of offset parameters on the movement of the slider is analyzed,and the structure type of the six-link mechanism is determined.According to the requirement of drawing process,and considering the impact of the lateral force of the slider,the size of the six-link mechanism is optimized.According to the design parameters of the press,the transmission system of the press is designed.And the power of the servo motor used in the press is calculated.Based on the optimized size,the three-dimensional model of the servo press is established by using the complex design method of the six-link mechanism and the servo motor.The finite element analysis software is used to analyze the static and modal analysis of the press body.The kinematics and dynamics of the designed press are analyzed by virtual prototyping technique.The kinematic performance of the press is predicted.The capacity of the selected servo motor is verified by simulation of the driving torque of the press.The lateral force of the slider is studied by using simulation technology.The influence of mechanical pair clearance and size error on the bottom dead center precision of the slider is analyzed,and the method of improving the position precision of the bottom dead center of the slider is given.The simulation results show that the whole performance of the six-link two-point press is excellent,the selected servo motor can meet the work requirements of 200 kN press,and the lateral force of the slider is small.