A method for measuring commutation period and overshoot amplitude of EDM servo machining shaft

Abstract

The invention discloses a method for measuring commutation period and overshoot amplitude of an electric spark servo machining shaft. Firstly, an electrode is driven to move to make contact with a workpiece, a short circuit signal is sent to a system, and then the movement of the servo machining shaft is stopped by the system; secondly, the electrode is moved to make contact with the workpiece, the system performs back-off order after receiving the short circuit signal, and then a non-short circuit signal is sent to the system when the electrode is reversely disengaged; the current position coordinate data of the servo machining shaft are recorded by the system; and then the actual contact position is obtained by averaging after the repetition of the above actions; thirdly, the electrode is moved until the coordinate value is equal to zero, then the electrode is moved to make contact with the workpiece, a coordinate difference value L1 and a time difference value T1 are recorded duringthe existing of the short circuit signal of a power source; a time difference value is recorded as T2 by reversely moving the electrode until the non-short circuit signal of the power source is received; L1', T1', and T2' are obtained by averaging after the repetition of the above actions; and the commutation cycle T of the servo machining shaft is equal to T2'-T1', and an overshot amplitude L isequal to L1'. The T and The L are inserted into the servo machining algorithm for real-time compensation during machining, so that the stable machining is achieved.

Description

technical field [0001] The invention relates to the field of electric machining, in particular to a method for measuring the commutation cycle and overshoot range of an electric spark servo machining shaft. Background technique [0002] The working principle of EDM is: apply periodic voltage pulses between the forming electrode and the workpiece, adjust the distance between the electrode and the workpiece through the servo feed of the machining axis, and generate pulse discharge when the electrode is close to the workpiece. Then the workpiece material is etched away to achieve the purpose of cavity processing. [0003] In the process of pulse discharge machining, due to the influence of factors such as different processing materials and different discharge cycles, the average voltage of actual work is unstable. In order to control the stability of the average voltage, a voltage servo control system is provided to maintain the average value of the actual working voltage with...

AI Technical Summary

Problems solved by technology

[0004] Those skilled in the art know that in order to achieve the purpose of stable processing, the amplitude of servo vibration of the processing axis should be small, but the frequency should be high, and the large vibration with low frequency means that the processing is unstable, which is not only harmful to the processing quality Influence, but also affect the processing efficiency, and even cause frequent open circuit and short circuit