Mechanism Research Of Single Stroke Of High-speed CNC Turret Punch Driven By Servo Motor

As the rapid industrial development in our country, the demand for mechanical products continued to increase, and the need of multiform products also increase. Since the inherent structure and drive, the traditional CNC turret punch lack of flexibility and can not meet the needs of precision, flexible, high-speed, diverse. Compared to the traditional mechanical NC turret punch and the hydraulic NC turret punch, the high-speed CNC turret punch driven by Servo motor is of the advantages of low-power, low noise, high efficiency. More important, the curve of stamping can be changed as one wishes. Then, the high-speed CNC turret punch driven by Servo motor is of a high degree of flexibility to meet the processing requirements of different processes.Against the weakness of traditional CNC turret punch lack of flexibility, single stroke of the high-speed CNC turret punch driven by servo motor is mainly study in this paper. On the base of those, the corresponding driven system is designed.In this paper, high-speed CNC turret punch driven by servo motor is introduced firstly. Then the kinematics and dynamics of the main transmission component, crank-toggle machanism, are analyzed deeply. The analysis include: the relationships between the displacement, speed, acceleration of the punch and the crank angle in the stamping process; the analysis of the each bars' force in the crank-toggle machanism under ideal circumstances; the relationship between the pressure and the press trip when the torque of crank is certain; the analysis of those key points bear maximum force under the standard load; the maximal instantaneous power. Base on those analysis, the transmission system of crank-toggle machanism, as its unique structure, is of smooth stamping curve. The punch reduce its speed and increase its press when it approach the dead point. So it is of the Characteristic of increasing force, and could reduce the load torque of servo motor. At the same time, the rupture in the plate near the stamping, due to high speed stamping, can be avoided, the noise in the process of stamping can be reduced too.Then, by calculating the energy consumed by the high-speed CNC turret punch driven by servo motor in single stroke, the appropriate power servo motor is selected and the flywheel driven by servo motor is designed and its moment of inertia is calculated. On the base of those, the ultimate torque born by the flywheel and output power are checked. The frequency of stamping could be 2000HPM when pressing armor plate of 2mm.Finally, through the use of the simulation tool of Simulink dynamic system in MATLAB computing software, the designed system has been simulated on constant speed without load and with load. According to the results of simulations, the designed system could meet requirements.Compared with foreign countries, the high-speed CNC turret punch driven by servo motor in our country is still in its initial stage. Its research and development are of great practical significance in improving our quality of forging machine tool equipment and upgrading the level of Chinese manufacturing industry.