Pulse power source for electric working machine tool

Abstract

The pulse power source for electric working machine tool has serially connected first power switch, limiting inductor, workpiece, working electrode separated from the workpiece in some interval, the second power switch, the first aftercurrent diode connected between the first power switch and the negative pole of the power source and the second aftercurrent diode connected between the first power switch and the positive pole of the power source. After the control pulse ends, the energy stored inside the inductor may be used for further discharge working, and the excessive part is returned to the power source to save electric energy over 80 %. In addition, the work current is triangular wave, and this results in required production efficiency and roughness and very low pole loss.

Description

technical field [0001] The invention relates to a pulse power supply of an electric machine tool. Background technique [0002] When the existing electric machine tool is processing the workpiece, its pulse voltage waveform and the corresponding current waveform can be divided into two parts. The first part is the small current and high voltage part that breaks through the machining gap, and its function is to apply the processing pulse The initial stage breaks down the insulating medium between the processing electrode and the workpiece. The voltage is generally 100--300V, and the corresponding current is several amperes; the second part is relative to the breakdown voltage and breakdown current. For the working part of low voltage and high current, the voltage is generally 20--50V, and the corresponding current is several to hundreds of amperes. [0003] Existing pulse power supplies for electric machine tools generally consist of a power supply, a current-limiting elemen...

AI Technical Summary

Problems solved by technology

When the processing pulse is applied, when the applied voltage drops sharply from the higher breakdown voltage to the working voltage, a large amount of electric power is consumed on the current-limiting element. The current-limiting element generally adopts a high-power resistor, and the waste of electric energy is extremely alarming. And it also caused the ambient temperature to rise, which needs to be forcibly cooled by electric fans or air conditioners, and some inductors are used as current limiting components, but the induced current generated by the inductor needs to be stored by capacitors, and still needs to be consumed by resistors

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