Return-to-zero system and method for electric discharge machining machine tool

Abstract

The invention discloses a return-to-zero system and a return-to-zero method for an electric discharge machining machine tool. The system comprises an industrial personal computer, a motor driver, a motion control card, a motion module, a rotary coder, a photo-electronic switch and a motor, wherein the industrial personal computer is used for controlling the motion control card; the motion control card is connected with the motor driver, the rotary coder and the photo-electric switch respectively; the motor driver is used for controlling a shaft to move by virtue of the motor and driving the motion module; the rotary coder is used for feeding back the motion information of the shaft to the motion control card in real time; and the photo-electric switch is used for receiving signals and feeding back the signals to the motion control card. By adopting the method, high consistency of a zero position is realized; the consistency of a coordinate system of the machine tool which is repeatedly powered and powered off is guaranteed; the repeat accuracy is guaranteed; collision caused by machining or program running is prevented; damages and scrapping of work pieces and precision reduction of the machine tool are prevented, so losses caused by shutdown of the machine tool are reduced, the machine debugging cost is lowered, the cost for replacing shaft accessories and dismounting the shaft is lowered, the work efficiency is improved, the maintenance cost is lowered, and durable machining precision of the machine tool is guaranteed.

Description

technical field [0001] The invention relates to a zero return system and method of an electric discharge machine tool, belonging to the technical field of electric discharge machining. Background technique [0002] Returning to zero is to let the machine tool know where the reference point of the machine tool is. The operations that must be completed every time the CNC machine tool is powered off and turned on. [0003] After the return-to-origin axis receives the return-to-zero signal, it moves toward a fixed direction at a slower speed at the current position. After receiving the signal as a zero-position photoelectric switch, the motion control system begins to detect the encoder zero-position pulse; when the system detects After reaching the first zero pulse, the motor stops rotating immediately, and the current position is the zero point of the machine tool. [0004] The original zero return method has the following disadvantages: 1) The characteristics of the photoel...

AI Technical Summary

Problems solved by technology

[0004] The original zero return method has the following disadvantages: 1) The characteristics of the photoelectric switch and the rotary encoder detect that the signal is at the same position each time, and there may be a pitch difference, which affects the accuracy of the zero return; 2) The influence of the external environment , the feedback of the photoelectric switch at the zero position is hysteresis, and the zero point is inconsistent

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