Pulsed power supply for electric spark machine tool

Abstract

The invention relates to a pulsed power supply for an electric spark machine tool. The pulsed power supply for the electric spark machine tool comprises a pulse signal forming circuit, a power amplifier for carrying out power amplification on a pulse signal, and a current detecting circuit for detecting output current of the power amplifier. The pulse signal forming circuit comprises a single-chip microcomputer IC1 and a D / A (Digital-to-Analog) converter. The single-chip microcomputer is connected with an input port of the D / A converter; the output end of the D / A converter is connected with the input end of the power amplifier; an electrode DJ as a load and a workpiece GJ are connected into an output circuit of the power amplifier; a voltage value of a discharge pulse is automatically controlled through the single-chip microcomputer, so that the voltage of the discharge pulse outputted by a pulsed power supply is matched with the cutting speed, the normal spark discharge is maintained, the machining efficiency and the machining quality are improved, and meanwhile, the inconvenience caused by adjusting the cutting speed through manual work is avoided; and the current detecting circuit detects short-circuit current when a low-voltage detecting pulse occurs, so that a wire electrode can be prevented from being damaged, the occurrence of arc discharge can be prevented when the workpiece is deviated from an electrode, and the reduction of the finish degree of the workpiece is avoided.

Description

technical field

[0001] The invention relates to a pulse power supply, which is used in an electric discharge machine tool as a discharge power supply. Background technique

[0002] The output voltage of the pulse power supply used in electric discharge machine tools such as wire cutting machine tools and punching machine tools is preset. There is no automatic voltage regulation function during the EDM process. The feed speed of the carriage is the feed of the workpiece. The speed should match the voltage of the pulse power supply. If the feed speed is too fast, the workpiece will contact with the electrode to form a short circuit. If the feed speed is too slow, an open circuit will be formed between the workpiece and the electrode. Both phenomena will affect the processing efficiency and Processing quality; in order to maintain a reasonable gap between the electrode and the workpiece to generate spark discharge, the operator needs to repeatedly adjust the feed parameters acc...

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