Mold feeding height measurement calibration method for pressing machine

The invention relates to a mold feeding height measurement calibration method of a pressing machine, which belongs to the technical filed of a control system of the pressing machine. The invention utilizes the characteristics that when the positive direction rotation output of an absolute value rotation coder without a reset switch fixed in a slide block exceeds the maximum value, the output is progressively increased again from the initial point, and conversely, when the reverse direction rotation of the coder is smaller than 0 bit, the output is progressively decreased from the maximum value. A PLC program of the calibration algorithm is designed, so the measurement state of the coder can be determined according to an input actual measurement value only through inputting manually measured actual mold feeding height value of the slide block before entering the calibration picture of a human-computer interface. Thus, that any position can reach the zero point of the coder in the measurement process of the coder can be known, so the corresponding algorithm program can be determined. The invention realizes the effects of simple operation and no need of professional staff and professional software, and the measurement value can be calibrated and corrected through the human-computer interface.