Resistance-free electric spark pulsed power source and processing method and gap discharge state recognition state thereof

Abstract

The invention discloses a resistance-free medium wire feed pulsed power source and a processing method and gap discharge state recognition state thereof. A circuit comprises a power loop, a drive circuit, an FPGA controller, a voltage detection circuit and a current detection circuit. When a first switch pipe is turned on to the maximum wait breakdown time threshold value, the gap voltage in the time frame is detected, the average voltage is calculated, and of the average voltage is a floating voltage, a gap is recognized in an idling state; otherwise, the first switch pipe is turned off, after dead time, when a second switch pipe is turned on, the gap current is detected, changes of the current descending slope are calculated, if the slope change rate exceeds the descending slope change rate threshold value, the gap is recognized as a short circuit, and if the slope hardly changes or changes slightly, the gap is recognized as normal discharge; and according to the recognized gap state, necessary bases are provided for the feed direction and speed of a servo system. The recognition precision of the gap discharge state of the power source is improved, and then the processing efficiency and discharge rate of the power source are improved.

Description

technical field [0001] The invention relates to pulse power supply technology, in particular to a non-resistance electric spark pulse power supply and its processing and gap discharge state identification method. Background technique [0002] As a core part of the EDM machine tool, the pulse power supply determines the roughness of the machined surface, the loss of the electrode wire, the machining accuracy, the machining efficiency and the utilization rate of electric energy, etc. Therefore, the efficiency of the pulse power supply for parts processing is very high. Require. In the field of WEDM industry, a considerable number of pulse power supplies for commercial machine tools use resistive transistor power supplies. The output current is adjusted by adjusting the resistance value of the series resistance of the power loop. However, such pulse power supplies consume a lot of power and have low efficiency. [0003] In addition, the gap discharge state of the power supply ...

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Problems solved by technology

The traditional gap discharge state identification is based on the filtered gap average voltage. The detection time is at the millisecond level, and each processing cycle is generally at the microsecond level. Therefore, the traditional method cannot know the gap discharge status of each processing cycle. , to deal with harmful pulses in time (such as instantaneous short circuit caused by poor chip removal)

Secondly, in actual processing, according to different processing requirements, the pulse width pulse-to-pulse ratio will be adjusted accordingly, resulting in the relative size of the average voltage thresholds of the three gap discharge states will also change, so the state identification method of gap average voltage is no longer applicable

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