A Feedback Compensation Method for Bottom Dead Center Deviation of Servo Press

Abstract

The invention discloses a feedback compensation method for the lower dead point deviation of a servo press. In a stamping process, the motor runs according to the compensated curve. The compensation amount for the first stamping process is zero. During the return process after the slider passes the bottom dead center in each stamping process, the control software calculates the compensation amount according to the deviation feedback compensation algorithm, and calculates the new compensated curve, and finally controls the servo motor to rotate according to the new compensated curve. It can measure the error between the actual value and the expected value of the bottom dead center of the slider during each stamping process, and use the feedback control principle to automatically compensate the position curve of the servo motor. After several stamping cycles, the lower limit of the slider can be adjusted. The error is reduced to zero, and when the error increases due to changes in external conditions, curve compensation is performed at any time to ensure that the bottom dead center of the slider is equal to the expected value.

Description

technical field [0001] The invention relates to the technical field of servo press control, in particular to a feedback compensation method for bottom dead center deviation of a servo press. Background technique [0002] In recent years, servo presses have been widely used in the stamping industry. The servo press is driven by the servo motor through the mechanical mechanism to move the slider up and down, and the material forming process is completed by applying pressure to the workpiece. The overall structure of the press is as Figure 5 shown. [0003] The user inputs the expected slider operating position parameters through the user interface, and then the central controller calculates the setting curve of the motor position according to the corresponding relationship between the motor position and the slider position, and sends the control commands one by one according to the value of the setting curve during the control process. sent to the servo driver. The servo d...

AI Technical Summary

Problems solved by technology

Because the auxiliary motor can only drive the mechanical parts to complete the compensation operation when the slider returns to a higher position without force, and it takes time to start and stop the auxiliary motor, so in the continuous stamping process, the existing technology There is not enough time to complete the bottom dead center automatic compensation operation

[0009] In addition, due to the inconvenience of mechanical operation, the existing technology minimizes the number of compensation adjustments, so compensation is only performed when the deviation of the bottom dead center exceeds a certain threshold

This results in BDC deviations that tend to be close to the set threshold, making it impossible to achieve high accuracy

Images