Impulsing power source for spark pinhole processing

Abstract

The invention discloses electric spark microhole processing pulse power supply suitable for the numerical control electrical discharge wire-cutting, which comprises a main vibration circuit, a drivingcircuit, a detection circuit, a non-normal spark treatment module in breakdown cycle, a non-normal spark treatment module in heavy current processing cycle, the high voltage direct current power supply, the medium voltage direct current and a power amplification circuit; wherein, the non-normal spark treatment module in breakdown cycle and the non-normal spark treatment module in heavy current processing cycle are arranged between the main vibration circuit and the detection circuit which is used in the real time online detection of gap discharge state; the signals of the no-loaded cycle in breakdown are adopted as the waiting signals of the main vibration circuit, and the signals of the heavy current processing cycle are adopted as trigger signals of the intermittent inhibitive cycle ofthe main vibration circuit; the switching of the multifunctional processing circuit and the working modes of two power supplies on the same wire-cutting machine can be realized by controlling the on andoff time of a first power switch tube (T1).

Description

technical field [0001] The invention relates to a pulse power supply suitable for electric spark high-speed small hole machining machine tools. Background technique [0002] The current pulse power supply of high-speed small hole processing machine tools has a current-limiting resistor, which generates a large amount of heat energy during processing, which reduces the processing efficiency and increases the volume of the pulse power supply. The rising edge of the traditional pulse power supply is steep, the electrode loss is large, and the processing cost is high. When the depth-to-diameter ratio of the processing hole is large, it is difficult to discharge the discharge corrosion product, the electrode loss is high, and the processing efficiency is low. [0003] The "circular superposition chopping type energy-saving EDM pulse power supply" disclosed in the authorized announcement number CN1325215C, the pulse power supply is composed of a main vibration circuit, a drive ci...

AI Technical Summary

Problems solved by technology

[0004] Traditional power supply is designed with current-limiting resistors, resulting in large heat generation and low power utilization; in addition, pulse power supplies are bulky and costly

The detection circuit adopts the average voltage sampling method, which reflects that the processing state has a certain lag time. The processing current is a rectangular wave with a steep rising edge, and the loss of the tubular electrode is large.

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