Electric discharge machine having wire electrode cutting function, and wire electrode cutting method

Abstract

The invention provides a wire electric discharge machine and a wire electrode cutting method capable of carrying out a wire electrode cutting process without need for an operator to input information on material or a diameter of a wire electrode. An electric current measuring device measures a value of an electrical current flowing through a wire electrode to which a voltage is applied. An electrical resistance of the wire electrode is detected based on the applied voltage and the measured value of the electrical current. A plurality of cutting conditions predetermined and stored for electrical resistances of different types of wire electrodes. A cutting condition for the wire electrode is determined based on the detected electrical resistance of the wire electrode and the stored plurality of cutting conditions, and the wire electrode is fusion-cut on the thus determined cutting condition.

Description

technical field [0001] The present invention relates to a wire electric discharge machine (wire electric discharge machine), and more particularly, to an electric discharge machine (electric discharge machine) with a wire electrode cutting function and a wire electrode cutting method. Background technique [0002] When machining multiple workpieces or cutting multiple products from a single workpiece, the wire electric discharge machine inserts wire electrodes sequentially through the machining start holes pre-formed in the workpiece, and performs electrical discharge machining. [0003] Under such circumstances, a highly reliable automatic wire cutting / joining function is inherently required for a wire electric discharge machine performing continuous unattended operations. With this function, the wire electrode is automatically cut after machining from a specific machining start hole is completed, and the wire guide is moved to the position where the next machining start ho...

AI Technical Summary

Problems solved by technology

This method is based on the premise that the cutting conditions are "input" by the operator, which creates a problem that when the "input" is not performed correctly, the wire electrode cutting and connection operations cannot be performed correctly

However, if the current is too large, the wire tail becomes spherical when the wire is cut, which makes it difficult to smoothly insert the wire into the processing start hole at the time of wire connection, and causes a problem that a lot of time is required for wire connection

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