Bottom dead center deviation feedback compensation method of servo press

Abstract

The invention discloses a bottom dead center deviation feedback compensation method of a servo press. In a stamping process, a motor runs according to a compensated curve, and the compensation amountof a first stamping process is zero; and a control software calculates the compensation amount according to a deviation feedback compensation algorithm in the return process after a sliding block passes through bottom dead center in each stamping process, a new compensated curve is calculated, and finally a servo motor is controlled to rotate according to the new compensated curve. The error between an actual value and an expected value of the bottom dead center of the sliding block can be measured in each stamping process, and the position curve of the servo motor is automatically compensatedby using a feedback control principle; and after several punching cycles, the lower limit error of the sliding block can be reduced to zero, and when the error increases due to changes in external conditions, the curve compensation can be carried out at any time to ensure that the bottom dead center of the sliding block 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 drive. The servo dr...

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

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