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Wire EDM

A technology of electrical discharge machining and wire electrode, which is applied in the field of online electrode electrical discharge machining devices, can solve problems such as danger, easy wire breakage of wire electrode, and unstable running of wire electrode

Active Publication Date: 2016-05-18
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the wire electric discharge machining device, the machining conditions are adjusted so that the machining energy is increased as much as possible in order to increase the machining speed, but if the machining energy is increased, the wire electrode is likely to break
In addition, when processing a shape that tends to become unstable, the wire electrode is also prone to disconnection.
In addition, wire breakage is unavoidable for the wire electric discharge machining device because the wire run becomes unstable due to time-dependent changes in the elements of the wire run system, so the wire breaks easily.
[0003] If the wire breakage is not detected accurately and at high speed, the machining power is turned off, and the wire travel is stopped, electric discharge will occur outside the workpiece, which is very dangerous.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0021] figure 1 It is a figure showing the structure of the whole apparatus of the wire electric discharge machining apparatus 100 which concerns on Embodiment 1 of this invention. The wire electric discharge machining apparatus 100 has: a wire electrode 1; a bobbin 3 (wire supply unit) for supplying the wire electrode 1; and wire electrode guide rollers 4, 5, 6, 7, and 10 arranged on a path where the wire electrode 1 travels. ; recovery rollers 11a, 11b, which recover the wire electrode 1 at a prescribed speed; a recovery motor 12, which drives the recovery roller 11a; a speed control unit 15, which controls the rotational speed of the recovery motor 12; the tension roller 9 and the pinch rollers 8a, 8b , which apply tension to the wire electrode 1; a tension motor 13, which drives the tension roller 9; an encoder 14, which is mounted on the tension motor 13; a servo amplifier 16, which controls the tension motor 13; and a numerical control (NC) unit 17, It controls the spee...

Embodiment approach 2

[0033] Figure 4 It is a figure which shows the structure of the whole apparatus of the wire electric discharge machining apparatus 200 which concerns on Embodiment 2 of this invention. Further effects can be achieved by the wire breakage detection method in which wire breakage detection is performed using the wire electric discharge machining apparatus 200 of this embodiment. Figure 4 The structure of the wire electric discharge machining device 200 is to figure 1 The structure of the wire electric discharge machining apparatus 100 is a structure in which the moving average speed calculation unit 23 , the speed fluctuation calculation unit 24 , and the speed fluctuation suppression unit 25 are added. Figure 4 The functions and actions of other structural elements are the same as those in Embodiment 1 figure 1 The same description is made, so the description is omitted.

[0034] exist Figure 4 Among them, the moving average speed calculation unit 23 calculates the movin...

Embodiment approach 3

[0037] Image 6 It is a figure which shows the structure of the whole apparatus of the wire electric discharge machining apparatus 300 which concerns on Embodiment 3 of this invention. In Embodiment 1, the speed control of the recovery motor 12 by the speed control unit 15 was described, but in Embodiment 3, the configuration is such that instead of figure 1 The recovery motor 12 and as Image 6 The change shown is a torque controlled recuperation motor 12a, replacing figure 1 The tension motor 13 is changed to Image 6 The servo motor 13a is shown and performs speed control.

[0038] That is, the speed control means 15 controls the torque of the recovery motor 12a, and the servo amplifier 16 controls the speed of the servo motor 13a. In this embodiment, the encoder 14 is attached to the recovery motor 12a, and measures the rotation amount of the recovery motor 12a. The speed calculation unit 18 converts the rotation amount measured by the encoder 14 into a rotation speed...

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PUM

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Abstract

A wire electric discharge machining apparatus according to embodiments includes a wire electrode, a wire supplying unit that supplies the wire electrode, a collecting motor that collects the wire electrode at a predetermined speed, a tension motor that controls a tension of the wire electrode between the wire supplying unit and the collecting motor, a speed calculating unit that calculates a traveling speed of the wire electrode at a predetermined time interval, a speed storing unit that stores the traveling speed calculated by the speed calculating unit, a differential speed calculating unit that calculates a differential speed between a current traveling speed output from the speed calculating unit and a past traveling speed stored in the speed storing unit, and a breakage detecting unit that detects breakage of the wire electrode by comparing the differential speed with a predetermined threshold.

Description

technical field [0001] The present invention relates to a wire electric discharge machining device capable of detecting wire breakage. Background technique [0002] In the wire electric discharge machining apparatus, the machining conditions are adjusted so as to increase the machining energy as much as possible in order to increase the machining speed. However, if the machining energy is increased, the wire electrode is likely to break. In addition, when machining a shape that tends to become unstable, the wire electrode is also likely to be disconnected. In addition, wire breakage is unavoidable for the wire electric discharge machining apparatus because the wire run becomes unstable due to time-dependent changes in the elements of the wire run system, so the wire is easily disconnected. [0003] If the wire breakage is not detected accurately and at high speed, the machining power is turned off, and the wire travel is stopped, electric discharges will occur outside the w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23H7/10B23H7/02
CPCB23H7/04B23H7/10
Inventor 小野寺康雄中川孝幸
Owner MITSUBISHI ELECTRIC CORP