JPS62193726A - Wire electric discharge machine - Google Patents

Abstract

PURPOSE:To enhance reliability for automatic supply, by constituting an insulating means between a pipe guide, which guides a wire electrode to be inserted into the inside, and the wire electrode so that the wire electrode, when it is broken, eliminates its surface roughness and/or secondary break inside the pipe guide. CONSTITUTION:A pipe guide 16a applies to its internal surface an insulating material 70 of, for instance, resin, glass, ceramics, etc. When a tensely provided wire electrode 10 is broken, its one end is brought into contact with a work 12, while the wire electrode 10 in the pipe guide 16a also loosens, and one part of the electrode is brought into contact with the internal surface. At a point of this time, machining energy is still supplied from a power source 26, but the insulating material 70 in the internal surface, whose insulating effect displays action, prevents an electric discharge phenomenon. Accordingly, the wire electrode 10, even after it is broken, is automatically supplied passing through a die guide 18 after the electrode is cut by a cutter 54 because the wire electrode 10 is prevented from causing its surface roughness due to an electric discharge while from inducing a secondary break due to discharge concentration.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] This invention relates to a wire electrical discharge machining apparatus that performs machining by guiding a wire electrode in a machining area using a guide having a pipe structure.

[Conventional technology]

Conventionally, as a device of this type, there has been a wire electrical discharge machining device equipped with a wire white side feeding device that automatically inserts and feeds a wire electrode.

Figure 2 is a configuration diagram showing the state of a conventional wire electrical discharge machining device during machining.
□□ is the workpiece, a4) is the initial hole through which the wire "&pole QO" drilled in the workpiece (2) is passed, and this workpiece (5) is not shown in the figure. The device drives the wire 7M in the X and Y directions with respect to the pole QO.00 is a pipe guide, and there is a wire electric GWC inside.
I (S is an oil filler pan, and its tip is equipped with a die guide α that slidably holds the wire electrode 00 in the processing area. (A) is the bottom of the workpiece @ On the side is a die guide that slidably holds the wire electrode 00, and is attached to the upper end of the lower guide.
This is an upper power feeder that supplies additional energy from a power supply wire to the pipe guide αQ, and is configured to be in contact with a wire electrode αQ inside the pipe guide αQ. (to) is a lower feeder similar to the above upper feeder @, and is attached to the lower guide.

(A) and (2) are upper and lower nozzles that spray machining fluid cA into the electrical discharge machining area between the wire electrode 00 and the workpiece (2). (to) is a guide that guides the pipe guide αQ and also supplies power to the upper feeder electron through the pipe guide αQ. The chrysanthemum and mackerel are the machining fluid inlets that feed the machining fluid to the nozzles (A) and (2). -) is a pinch roller that feeds the wire 01 to the lower guide through the pipe guide αG, and is attached to the upper end of the pipe guide QiS and sends the wire electrode σq downward by a drive motor (not shown). supply. Oe is a motor that moves the pipe guide OG upward and downward along the guide rod rotation by the feed screw 0 and the slider member. (Foundation)
is a cutter that cuts the wire electrode αO. ω is a roller that pulls and drives the wire electrode α1 that has been fed to the lower guide (A), and the wire electrode αO is sent out to the outside by a loaf tray with a belt trowel stretched over it and a motor connected to the roller. It is configured like this.

Next, the operation will be explained. Connect the wire electrode head to the workpiece (
2) is sent as a tribute to the lower guide (A).

The pipe guide 00 is driven by the drive motor (g) through the initial hole μα4 to the lower guide @.

Next, rotate the pinch loaf (I) to send out the wire electric ICQ, and operate the motor 6 to move the loaf (I).
is rotated, and the wire electrode αO that is sent out is grabbed and discharged from the device. Also, when cutting the wire electric mQG,
After the pipe guide α0 is pulled up to the top of the cutter, the cutter is driven by a drive source (not shown) to cut the wire electrode α1.

In addition, the diameter of the die guide (to) and wire should be 2 to 2 to
It is formed 10 μm larger.

[Problem that the invention seeks to solve]

Since the conventional wire electric discharge machining apparatus is configured as described above, when the wire electrode Ql is disconnected.

As shown in Figure 8, one end of the broken wire electrode αQ comes into contact (AA) with the workpiece (B), and the pole αO also comes into contact with the wire inside the pipe guide α0 (B, ζ). . In this case, during the delay time from the actual wire breakage until several control devices detect the wire breakage and stop machining, electrical discharge occurs at each of the above contact points (points A and B). , the surface of the wire electrode α0 becomes rough. Due to the roughness of the surface of the wire electrode a*, there is only a gap of 2 to 10 μm, and the wire electrode 0q is caught by the swivel die guide (toward), and the wire electrode αO is moved by the pinch roller (
goods) will no longer be able to be sent. Furthermore, if the discharge is concentrated in one place.

The wire was also broken at the pole α0 at that point, making it completely impossible to automatically feed the wire, which caused problems such as hindering automation of the wire electrical discharge machining apparatus.

This invention was made to solve the above problems, and even if the wire electrode breaks, there is no surface roughness of the wire electrode inside the pipe guide or secondary breakage of the wire electrode, and it is reliable. The purpose of the present invention is to provide an automatic wire supply bag @ that is inferior in nature, and to obtain a wire electrical discharge machining device that can be automated.

[Means for solving problems]

In the wire electrical discharge machining apparatus according to the present invention, an insulating material is applied to a pipe guide through which a wire w and a pole are inserted and guided.

[For production]

The pipe guide according to the present invention prevents discharge between the wire electrode and the pipe guide that occurs when the wire electrode is disconnected due to the insulating effect of the insulator.

[Embodiment of the Invention] An embodiment of the invention will be described below with reference to the drawings. 1st
Figure 1 is a partially enlarged view of the wire electrical discharge machining apparatus according to the present invention. In Figure 1, (16a) is a pipe guide having an insulating drive wheel made of resin, glass, ceramics, etc. on the inner surface.

The present invention is identical in operation and function to the conventional device, except that an insulating winding is applied to the inner surface of the pipe guide (1, 6a) for holding and guiding the wire electrode αO.

In the wire electric discharge machining apparatus, when the stretched wire electrode αQ is disconnected, one end of the cut wire electrode head comes into contact with the workpiece 4, and the pipe guide (16a
), since Tensilon no longer acts on the wire electrode C1O, a portion of the slack 5 comes into contact with the inner surface of the pipe guide (16a). At this point, machining energy is still being supplied between the wire electrode head and the workpiece (2) by the power source (e).

Discharge occurs at the contact portion, but in this invention, the pipe guide (1) that holds and guides the wire electrode αO is
By applying the insulator I70 to the inner surface of 6a), an insulating effect acts to prevent the above-mentioned discharge phenomenon.

Therefore, since the surface of the wire electrode 00 is not roughened due to discharge and secondary breakage due to concentration of discharge is not induced, it is possible to automatically feed the straight wire wire even after the wire W pole 00 is broken.

In addition, in the above embodiment, the insulator f0 was applied to the inner surface of the pipe guide (16a), but the pipe guide (16a)
It may be made of an insulating material and its surface may be coated with a conductive material.

In this case, the conductive coating was provided for the purpose of operating a contact stop function as a safety measure in the event that the pipe guide (16a) and the workpiece (2) come into contact due to an operator's operational error, etc. Yes, conductive coating is not necessarily required.

``Ifc, an insulator (7co) has an electrical insulating effect, and is not particularly limited to the materials in Example 1.

〔Effect of the invention〕

As described above, according to the present invention, since the pipe guide that holds and guides the wire electrode is coated with an insulating material, generation of discharge is prevented even when the wire electrode is disconnected.

Prevents wire tension and secondary disconnection. Therefore, it is possible to automatically supply the wire Ii with high reliability, and it is possible to obtain a highly automated wire processing apparatus with a high operating rate.

[Brief explanation of drawings]

FIG. 1 is a partially enlarged view of a wire electrical discharge machining device according to an embodiment of the present invention, FIG. 2 is a configuration diagram of a conventional wire electrical discharge machining device, and FIG. be. In the figure, αO is a wire electrode, and (2) is a workpiece. (16a) is a pipe guide, σQFs, and an insulator. Note that the same reference numerals in Figure 1 indicate the same parts.

Claims (2)

[Claims] (1) In a wire electrical discharge machining device that generates electrical discharge in a minute gap between a wire electrode and a workpiece to cut the workpiece into a desired shape, an insulator is applied to the pipe guide that holds and guides the wire electrode. A wire electrical discharge machining device characterized by: (2) The wire electrical discharge machining apparatus according to claim 1, characterized in that an insulating material is applied to the inner surface of the pipe guide.