Wire-cut electric discharge machine

Abstract

To effectively restrict wire tension fluctuation generated on the wire supply side from a brake roller.

Description

technical field [0001] The present invention relates to a wire electric discharge machine, and particularly relates to a structure for reducing vibration of a wire electrode. Background technique [0002] In the wire electric discharge machine, if the wire tension fluctuates and the wire vibrates, the processing accuracy will decrease, and the surface accuracy and straightness of the workpiece will decrease. Conventionally, in order to control the vibration of such a wire, it was necessary to adjust processing conditions such as current and voltage, set a processing speed, or apply tension to the wire. As a known method of giving wire tension, friction is applied to the rollers of the wire-feeding system to make the rollers difficult to rotate, so that the rollers are braked and tension is given to the wires. [0003] When the vibration of the wire is reduced by applying tension to the wire, there is a problem that the tension of the wire fluctuates due to fluctuations in t...

AI Technical Summary

Problems solved by technology

Therefore, since the effect of suppressing fluctuations in wire tension varies depending on the amount of fluctuations, there is a problem that good linearity in suppressing tension fluctuations cannot be obtained.

In addition, since the fluctuation range that can be suppressed is limited by the fluctuation amount of the spring part, there is a problem that the large wire tension fluctuation cannot be suppressed.

[0013] Moreover, since the tension fluctuation suppression characteristic depends only on the elastic characteristics of the spring portion, it is difficult to adjust the tension fluctuation suppression characteristic for different wire tension fluctuation ranges.

Images