Wire electrode supply device for wire-cut electric discharge machine

Abstract

A wire electrode supply device capable of preventing slack and snapping of a wire electrode even using a heavy wire bobbin without using a wire electrode tension detector. A pulley is provided between the wire bobbin driven by a torque motor and a brake roller. The wire electrode unwinds from the wire bobbin, passes through the pulley, brake roller and a workpiece work area, and is taken up by a wind-up roller. When the wire electrode traveling speed is changed from fast to slow, the pulley descends to prevent the wire electrode from slackening between the wire bobbin and the brake roller. When the traveling speed is changed from slow to fast, the back tension from the torque motor is reduced for a predetermined period of time, reducing tension on the wire electrode and preventing it from snapping. Also, the pulley descends, rotating the wire bobbin in the feeding direction and quickening tracking of the shift to fast feed speed, enabling snapping of the wire electrode to be prevented even when a heavy wire bobbin is used.

Description

technical field [0001] The present invention relates to a wire electrode supply device for a wire electric discharge machine. Background technique [0002] A wire electrode supply device of a wire electric discharge machine includes a bobbin for supplying a wire electrode, a braking device, and a wire winding device. The wire electrode supplied by the bobbin is braked by the brake roller of the brake device and passes through the work area where the workpiece is processed, and then the winding type roller or other winding device winds up the wire so that the wire electrode travels smoothly Tension is applied to it. A voltage is then applied between the wire electrode and the workpiece, creating electric sparks and performing machining. [0003] When the wire electrode is heavy, the bobbin of the wire electrode supplying device also becomes heavy, so a speed-controllable DC motor is used as the motor for driving the bobbin. By controlling the speed of rotation of the bobbi...

AI Technical Summary

Problems solved by technology

[0012] Specifically, when the travel speed of the wire electrode is changed from slow to fast, due to inertia, the heavier bobbin remains at a slow speed instead of going faster immediately, which will increase the tension of the wire electrode and may cause it to break

Moreover, when the traveling speed of the wire electrode is changed from fast to slow, it is also due to inertia that the heavy bobbin remains fast instead of slowing down immediately, which makes the wire electrode slack, deviates the traveling position of the wire electrode, and may Allow the wire electrode to slip completely off the guide rollers

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