JPS6319290B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a wire cut electric discharge machining apparatus.

2. Description of the Related Art Wire-cut electrical discharge machining apparatuses are widely used for cutting or drilling holes in a workpiece by electrical discharge machining using a single wire electrode.

In a wire cut electric discharge machining apparatus, in order to perform wire cut processing reliably and quickly, it is important to supply sufficient machining fluid to the machining surface and perform appropriate electric discharge and machining feed.

However, since conventionally known wire-cut electric discharge machining equipment performs electric discharge machining using a single wire electrode, it is difficult to cool the wire electrode sufficiently even if machining fluid is supplied sufficiently. Therefore, there were problems in that electric discharge occurred intensively and continuously at specific points on the workpiece, the electrode was likely to be cut, and the wire electrode had to be replaced depending on the shape of the workpiece.

The present invention has been developed based on the above-mentioned viewpoints, and its objectives are to provide easy supply of machining fluid, to cool it sufficiently, and to maintain the shape of the wire electrode even if the machining shape is changed. The present invention aims to provide a wire cut electrical discharge machining device that does not require replacement and is less likely to break during electrical discharge machining.

The gist of this is that multiple thin wire electrodes are grouped together using a guide, etc.
Another object of the present invention is to provide a wire-cut electrical discharge machining apparatus that performs electrical discharge machining by appropriately changing the number and arrangement of wire electrodes depending on the machining shape and the like.

Hereinafter, the details of the present invention will be specifically explained with reference to the drawings.

Figure 1 is an explanatory diagram of electrical discharge machining using a conventional single-wire wire electrode, and Figure 2 is an illustration of electrical discharge machining using a wire-cut electrical discharge machining device according to the present invention. Figures 3 and 4 show an embodiment of the wire cut electrical discharge machining apparatus according to the present invention. Figure 3 is an illustration of the apparatus equipped with a fixed guide, and Figure 4 is a rotating It is an explanatory diagram of a device equipped with a guide and a solenoid coil that controls how a plurality of wire electrodes are arranged.

In Figures 1 and 2, 1a and 1b are workpieces, 2
a, 2b are processed surfaces, 3a is a single wire electrode, 4
b, 5b, 6b, and 7b are thin wire electrodes, and four of them are grouped together to form an electrode.

Thus, thin wire electrodes 4b, 5b, 6b, 7
The single wire electrode 3a having a cross-sectional area equal to the sum of the cross-sectional areas of b has the same cross-sectional area, but the surface area of each thin wire electrode 4b, 5b, 6b,
7b as an electrode is larger, and the machining fluid is applied to each thin wire electrode 4b, 5b, 6b, 7b.
Since the machining fluid permeates through the process and is supplied to the machining surface 2b, the cooling rate of the wire electrode is high and the machining fluid is reliably distributed. In particular, during machining, the electrode moves in the axial direction while repeating rotational and reciprocating motions, so the machining surface 2b becomes the circumscribed cylindrical surface of the electrode, and the electrode and machining surface 2b
A machining fluid flow path is formed between the machining fluid and the machining fluid, and the supply of machining fluid increases from this point as well. Therefore, since the cooling effect is increased and a large current can be passed, the processing speed is also significantly improved.

FIG. 3 shows an embodiment of the wire cut electric discharge machining apparatus according to the present invention, and is an explanatory diagram of the apparatus equipped with a fixed guide as a pair of positioning guides for stretching the wire electrode in a straight line in the machining part. be.
In the figure, 1, 2, 3 are wire electrode supply drums, 1',
2', 3' are wire electrodes, 4, 5, 6 are brake rollers, 7, 8, 9, 17 are pinch rollers, 10,
11, 12 are guide rollers, 18, 19 are capstans, 20 are energizing rollers, 21, 22 are pinch rollers, 23, 24 are positioning fixed guides, 25
2 is a workpiece, 26 is a stage, and 27 and 28 are cross slide tables.

Therefore, during electrical discharge machining, each wire electrode 1', 2',
3', each wire electrode supply drum 1,
2, 3, at a constant speed against the braking action of brake rollers 4, 5, 6 and pinch rollers 7, 8, 9, and rollers 10, 11, 12
The three wire electrodes 1', 2', and 3' are brought together by a fixed guide 23 through 17 and 20,
The workpiece 25 is supplied to the processing section where it is placed.
The wire electrodes bundled together in the processing section are stretched linearly between fixed guides 23 and 24 with a constant tension, and are connected to the current-carrying roller 20 and the workpiece 25.
The workpiece 25 is
A discharge is performed between the The workpiece 25 is moved in a direction perpendicular to the electrode tensioning direction by driving the cross slide tables 27 and 28 using an NC device, and is processed in accordance with a desired processing contour. Note that a machining fluid that removes machining debris and the like and smoothes the discharge is supplied to this machining portion from a machining fluid nozzle (not shown).

In this way, in the wire-cut electric discharge machining apparatus according to the present invention, since a plurality of thin wire electrodes are used in a bundle, flexibility increases in proportion to the current-carrying area, so wire breakage due to bending, etc. does not occur. First, by increasing or decreasing the number of wire electrodes depending on the purpose of machining and the shape to be machined, electrical discharge machining can be performed with the overall thickness as desired.

Note that the shape of the positioning fixed guides 23 and 24 may be a boat-shaped guide, a die, or the like.

FIG. 4 shows another embodiment of the wire-cut electric discharge machining apparatus according to the present invention, in which a rotating guide is used as a pair of positioning guides for stretching the wire electrode in a straight line in the machining section, and a plurality of rotary guides are used as positioning guides. This is an explanatory diagram of a device equipped with a solenoid coil that changes the arrangement of the wire electrodes.
1 is a wire electrode supply drum, 32, 33, 34 are guide rollers, 36, 37 are capstans, 38
35, 39, 40 are pinch rollers, 41, 42 are positioning rotation guides,
43, 44, 45, 46 are timing pulleys, 4
7 and 48 are timing belts, 49 are servo motors, 50 and 51 are solenoid coils, 52 is a stage, 53 and 54 are cross slide tables, 55
is a base, 56, 57, 58 are wire electrodes, and 59 is a workpiece.

Therefore, during electrical discharge machining, each wire electrode 56,5
7 and 58 are connected to each wire electrode supply drum 2 by capstans 36 and 37 and pinch rollers 39 and 40.
Three wire electrodes 56, 57, 58 are pulled out from the rotating guide 41 at a constant speed.
are bundled together and then supplied to the processing section where the workpiece 59 is placed. The wire electrodes gathered together in the processing part are rotated by a rotating guide 41,
The rotary guides 41 and 42 are stretched linearly with a constant tension between them, and the rotational reciprocating motion is transmitted from a servo motor 49 via timing pulleys 43, 44, 45, 46 and timing belts 47, 48. Since electrical discharge machining is performed while receiving the electric discharge, the unevenness of the machined surface is removed and the surface becomes semi-cylindrical.

Note that the shape of the positioning fixed guides 41 and 42 may be a boat-shaped guide, a die, or the like.

Also, depending on the machining shape etc., the solenoid coil 5
0,51 is excited, and the three wire electrodes 56,5
7 and 58 are pressed against the protruding parts of the timing pulleys 43 and 45, and machining can be performed with the three wire electrodes aligned on one plane, so the machining time is significantly shortened.

Since the present invention is configured as described above, there is no need to replace the wire electrode depending on the machining shape, etc., and it is possible to increase the machining current (average machining current), so the machining time is significantly shortened. Ru.

Note that the present invention is not limited to the embodiments described above. That is, for example, in this embodiment, three wire electrodes are used together to perform electrical discharge machining, but the number of wire electrodes can be freely increased or decreased, and the number of wire electrodes can be freely increased or decreased. Although this is done from a servo motor via a timing pulley and a timing belt, it can also be done via a gear instead of the timing pulley or timing belt, and the present invention encompasses all of them.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram of electrical discharge machining using a conventional single-wire wire electrode, and Figure 2 is an illustration of electrical discharge machining using a wire-cut electrical discharge machining device according to the present invention. Figures 3 and 4 show an embodiment of the wire cut electrical discharge machining apparatus according to the present invention. Figure 3 is an illustration of the apparatus equipped with a fixed guide, and Figure 4 is a rotating It is an explanatory diagram of a device equipped with a guide and a solenoid coil that controls how a plurality of wire electrodes are arranged. 1, 2, 3, 29, 30, 31...Wire electrode supply drum, 1', 2', 3', 56, 57, 58
... Wire electrode, 20, 38 ... Current-carrying roller, 2
3, 24... Fixed guide, 41, 42... Rotating guide, 43, 44, 45, 46... Timing pulley, 47, 48... Timing belt, 50,
51... Solenoid coil, 25, 59... Workpiece, 27, 28, 53, 54... Cross slide table, 55... Base.

Claims (1)

[Claims] 1. A wire electrode supply drum, and at least one set of positioning guides for stretching the electrode drawn from the drum in a straight line at a processing area, and wire-cut electric discharge machining is performed at the electrode area between the positioning guides. A wire-cut electric discharge machining apparatus for carrying out the above-mentioned wire-cut electric discharge machining apparatus, wherein a plurality of the wire electrode supply drums are provided, and the positioning guide is a guide capable of stretching a plurality of wire electrodes in close contact with each other. 2. The wire cut electric discharge machining apparatus according to claim 1, wherein the positioning guide is a fixed guide. 3. The wire cut electric discharge machining apparatus according to claim 1, wherein the positioning guide is a rotation guide. 4. The wire cut electrical discharge machining apparatus according to any one of claims 1 to 3, wherein the positioning guide is a boat-shaped guide. 5. The wire cut electric discharge machining apparatus according to any one of claims 1 to 3, wherein the positioning guide is a die. 6. A wire-cut electrical discharge machining device that has a wire electrode supply drum and at least one set of positioning guides that stretch the electrodes pulled out from the drum in a straight line in a machining section, and performs wire-cut electrical discharge machining at the electrode section between the positioning guides. , a plurality of the wire electrode supply drums are provided, the positioning guide is rotatably supported, and the guide is capable of stretching the plurality of wire electrodes in close contact with each other, and the positioning guide is arranged between the positioning guides. A wire-cut electric discharge machining apparatus comprising a device that rotates together with the wire electrodes and aligns the plurality of wire electrodes on one plane. 7. The wire cut electric discharge machining apparatus according to claim 6, wherein the device for aligning the plurality of wire electrodes on one plane is a solenoid coil. 8. The wire cut electric discharge machining apparatus according to claim 6, wherein the positioning guide is a boat-shaped guide. 9. The wire cut electric discharge machining apparatus according to claim 6, wherein the positioning guide is a die.