Discharge detection device for discharge machine tool

Abstract

The invention discloses a discharge detection device for a discharge machine tool. The discharge detection device comprises an NC (numerical control) device, a parameter selection and signal generation device, a rough machining power supply loop, a finish machining power supply loop, a discharge detection device and a feed shaft motor drive control device. The discharge detection device comprises a decoding circuit, a first driving amplification circuit, a relay module, a branch circuit unit, a sampling signal processing circuit, a V / F conversion circuit, a second driving amplification circuit and a switch relay. In the invention, by means of a method for adjusting sampling reference voltage is realized by receiving three-bit binary codes given by a parameter selection and signal generation device and a method for carrying out V / F conversion on sampling signals under two different working conditions of rough machining and finish machining by using different filtering, isolating and processing circuits, the discharge detection device can more accurately judge whether the discharge process occurs in the machining gap or not and can more accurately sample the discharge pulse with the pulse width of less than 1us.

Description

Technical field [0001] The present invention relates to the technical field of discharge detecting apparatus, and is specifically a discharge detecting device for discharging processing machine. Background technique [0002] The discharge detecting device is an apparatus for detecting a gap voltage between the wire electrode and the workpiece and converts its analog voltage value into a frequency signal for controlling the discharge machining machine bed into the axial movement. In general, in order to increase discharge The surface roughness of the finished product produces the surface roughness of the finished product, first, first, in the workpiece, the desired contour is probably formed, and then the high-precision from the cutting surface removes excess material, and finally finance the cutting. Face roughness, [0003] The action of the discharge detection device in the discharge machine tool is to determine whether the wire electrode and the workpiece have occurred between...

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Problems solved by technology

[0003] The function of the discharge detection device in the EDM machine tool is to judge in real time whether a discharge has occurred between the wire electrode and the workpiece through the collected voltage pulse signal. In the traditional discharge detection device, two series-connected The sampling reference voltage value represented by the total voltage stabilization value of the Zener diode is fixed, but in the actual processing process, when the workpiece thickness, material properties and other parameters change or the same workpiece is being roughed and finished Under different working conditions, when the discharge process occurs between the wire electrode and the workpiece, the amplitude and pulse width of the gap voltage will change greatly. At this time, the traditional discharge detection device will judge whether the discharge process actually occurs. become inaccurate, thus affecting the processing efficiency and the roughness of the workpiece surface to be processed

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