Detection device and detection method for discharging state of electrical discharge wire-cutting

Abstract

The invention discloses a detection device for a discharging state of electrical discharge wire-cutting. The detection device comprises a discharging module, a discharging gap treatment module, a preset value module, a comparison module and an upper computer FPGA, wherein the discharging module discharges according to discharging parameters; the discharging gap treatment module samples discharginggaps during electrical discharge wire-cutting and treats the sampled discharging gaps in equal proportion; the preset value module is used for storing a preset value; the comparison module compares aresult obtained by the discharging gap treatment module with the preset value; and the upper computer FPGA adjusts the discharging parameters of the discharging module in real time according to the comparison result of the comparison module. The detection device performs statistics on a proportional probability on no-load, normal spark discharge and short circuit by detecting the discharging state, analyzes and feeds back the proportional probability to a control system, and adjusts the discharging parameters and feed.

Description

technical field [0001] The invention relates to an electric discharge machining equipment, more precisely, a detection device and a detection method for the discharge state of electric discharge wire cutting. Background technique [0002] As we all know, WEDM is a kind of electrical machining, which uses the principle of electric discharge to remove conductive metal. Generally, the reciprocating molybdenum electrode wire is used as the cathode, and the metal material is used as the anode to form two poles, and a medium is assisted to load the voltage on the two poles. As the distance between the two poles approaches, a breakdown discharge is triggered to remove the conductive anode metal. Material, move the electrode or metal material at a certain tracking feed speed to meet the requirements of position size, shape, surface quality, etc. In the EDM process, the voltage or current signal between the two poles is closely related to the machining results such as efficiency and...

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Problems solved by technology

[0007] It can be seen from the detection principle that the above two detection circuits cannot fully detect the three discharge states of short circuit, spark discharge, and no-load, and the generated voltage is the average or peak value of the voltage of each discharge state, which cannot represent the situation of each discharge pulse. ; At the same time, it is impossible to detect and accurately monitor every single discharge pulse

In addition, due to different materials, different workpiece heights, different media (in the discharge channel), and different processing effects, different voltages such as no-load, spark maintenance voltage, and short circuit are different, and the external conditions of processing, such as molybdenum wire The speed of movement and the amount of vibration are also different. The above reasons will cause the average value of the gap voltage or the peak value of the gap voltage to be different values. Therefore, the same detection circuit cannot be used to accurately detect and monitor the changing gap voltage in the discharge channel.

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