JPS6137046B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in an electrode unit for a wire-cut electric discharge machining device that feeds a wire electrode along one U-shaped path and performs wire-cut electric discharge machining on a part of the forward or return path. .

Conventional electrode units that have been put into practical use include those in which a set of necessary parts including an electrode supply drum and collection drum are attached to a rotatably supported base, and the entire device is rotated together with the base; The supply drum and recovery drum are installed separately from the electrode unit, for example, in a column of a fixed part, and the electrode unit is equipped with an electrode guide, a processing flow injection nozzle, etc.; however, in the former, the electrode unit is Rotating around the axis does not affect the geometry of the path of the wire electrode from the supply reel to the collection device, and the wire electrode only rotates with the electrode unit as a whole. Although the tension provided by the winding force and braking force of the latter type is kept approximately constant, there is a problem that a large electrode supply drum cannot be used with this type. , when the electrode unit rotates, the wire electrode path other than the electrode unit, that is, the electrode path portion from the wire electrode supply drum to the last electrode guide that feeds the wire electrode to the electrode unit, and the wire recovered from the electrode unit. Although the part of the electrode path from the electrode guide that first receives the electrode to the wire electrode collection device remains unchanged, the electrode guides for receiving and delivering the wire electrode of the electrode unit rotate, so the shape of the electrode path changes between them. This causes problems such as the tension of the wire electrodes changing and the wire electrodes themselves coming into contact and being easily tangled.

To elaborate further on the problems with this latter device,
For example, the last electrode guide that delivers the wire electrode to the electrode unit and the first electrode guide that receives the wire electrode in the electrode unit may be rollers or pulleys, or boat-shaped guides. , or the direction of the wire electrode reaching it changes significantly depending on the rotation of the electrode unit, and the most desirable direction for these guides is the tangential direction of the cylindrical surface of the roller or pulley, etc., or the boat shape. In the case of a guide, the direction of extension of the valley bottom line of the guide notch may deviate greatly. When the orientation of these wire electrodes corresponds to the most desirable direction, there is very little resistance on the wire electrodes, and the tension in the wire electrodes is
This mainly corresponds to the tension applied by an electrode pull-out device such as a capstan and a brake device provided at a location other than the electrode unit. However, when the direction of the wire electrode is displaced from the desired direction, a large resistance is generated there and the resistance is not constant, so that the tension applied to the wire electrode becomes unstable.

The present invention has been made based on the above-mentioned viewpoints, and its purpose is to provide a supply of electrodes, a collection drum, a part that applies a predetermined tension to the wire, a brake drum, a pinch roller, and a draw-out capstan. Convenient wire cutting electric discharge that does not change the tension on the wire electrode during machining or cause the electrode to get tangled or tangled in a separate type wire cutting electric discharge machining device in which the pinch roller is installed in a fixed part other than the electrode unit. An object of the present invention is to provide an electrode unit for processing equipment.

Therefore, the gist of the present invention is to provide an electrode guide column that has a plurality of electrode guides and can form a substantially U-shaped electrode path, and a mounting portion that can be attached to and detached from the arm of a desired wire-cut electrical discharge machining device. and a support device for rotatably supporting the electrode guide column, the electrode unit having a through hole through which a wire electrode passing through the electrode path enters and exits, and a support device that rotatably supports the electrode guide column. A tubular shaft coaxial with the rotating shaft of the electrode guide column is provided in the opening on the side of the mounting part, and one guide pulley is attached to this, and a guide pulley is provided outside the through hole that rotates together with the electrode guide column. A wire electrode is provided with one external electrode guide, and a wire electrode supplied from a wire electrode supply device provided in a column or the like of the wire cut electrical discharge machining device is drawn into the electrode unit through the center hole of the tubular shaft and provided on the electrode guide column. After routing the electrodes between the electrode guides, the electrodes are pulled out of the electrode unit, passed through the external electrode guides, wrapped around the guide pulley, and then collected by a desired collection device provided on the column or the like. It consists in composing. Note that the electrode path may be reversed to the above. In that case, the wire electrode enters the electrode unit from the supply device via the guide pulley and the external electrode guide, passes through the electrode guide of the electrode guide column, is pulled out from the center hole of the tubular shaft, and is sent to the recovery device.

In such a case, even if the electrode guide column rotates, the position of the path of the wire electrode sent to the electrode unit and the path of the wire electrode sent out from the electrode unit remain unchanged, and the position of the path of the wire electrode sent out from the electrode unit remains unchanged. The only variation in the electrode path is the variation in the electrode winding length of the pulley around which the wire electrode is wound.
In other parts, the electrode path does not change other than rotating with the electrode unit, and therefore the resistance between the wire electrode and various guides does not change to the extent that it becomes a problem, and the tension of the electrode becomes stable. It is.

Therefore, according to the present invention, even if the capstan or drum and pinch roller for winding and braking the wire electrode are provided in the fixed part column as in conventional wire cutting devices of this type, they are not included in the electrode path. The tension state of the electrode does not change due to rotation, so there is no decrease in machining accuracy.
Furthermore, the electrode unit of the present invention can be attached to conventional equipment.
In addition, the relative positions of the center hole of the tubular shaft into which the electrode is drawn into the electrode unit and the electrode supply device, as well as the relative positions of the guide pulley and the electrode recovery device, are kept constant even when the electrode guide column rotates. Therefore, there is absolutely no mutual contact or entanglement of the wire electrodes even outside the electrode unit.

The details of the present invention will be explained below with reference to the drawings.

FIG. 1 is a partially cutaway side view showing one embodiment of an electrode unit according to the present invention, and FIG. 2 is a perspective view showing essential parts of another embodiment. In FIG. 1, reference numeral 1 denotes an arm of a wire-cut electrical discharge machining apparatus to which an electrode unit 2 is attached, and the arm extends from a column (not shown) of the apparatus in parallel to the table surface on which the workpiece is placed on the bed. . 3 is a fixed cylinder that serves as a mounting part for the electrode unit 2; 4 is a rotating cylinder that is coaxially rotatably supported with the fixed cylinder 3; 5 is a ball bearing; 6 is a distance piece; 7 is a bearing holder; 8 is a bolt thereof, 9 is a work table that is attached to the lower surface of the rotary cylinder 4 and can be slightly moved in the horizontal direction in the figure by a feed screw 10, 11 is a micrometer head for the feed screw 10, 12 is its bracket, 13 14 is a set screw, 14 constitutes a cross table 15 together with the work table 9, and the work table is slightly moved in the direction perpendicular to the plane of the paper by a feed screw (not shown); 16 is a set screw for locking the work table 14; 17 is an electrode an electrode guide column with guides 18 to 24;
25 is a spur gear fixed to the rotating barrel 4, 26 is a spur gear provided in the arm 1, 44 is a shaft of the spur gear 26, and 27 is a tubular gear fixed to the upper surface of the rotating barrel 4 with a set screw 28. Shaft, 29 is guide pulley, 30,3
0 is a bearing, 31 is a retaining ring, 32 is a bracket that supports the electrode guides 33 and 34, 35 is a pin that fixes the bracket 32 to the tubular shaft 27, 36 and 37 are electrode guides provided in the arm 1, and 3
8 is a wire electrode, and 39 is a mounting bolt.

The components from the rotating cylinder 4 to the cross table 15 form an electrode guide post support device that can rotatably attach the electrode guide post 17 to the arm of a desired electric discharge machining apparatus.

The work table 9 is attached to the lower surface of the rotary cylinder 4 by a dovetail groove not clearly shown in the figure, and can be moved within a small distance range from side to side in the figure by a feed screw 10.

The work table 14 is attached to the lower surface of the work table 9, and can be moved in a direction perpendicular to the plane of the paper by means of a device (not shown) similar to the feed screw 10 or the like.

The electrode guide column has a substantially arcuate shape and is attached to a predetermined position on the lower surface of the work table 14.

A spur gear 25 is fixed to the upper end of the rotating cylinder 4, and when the electrode unit 2 is attached to the arm 1, the spur gear 25 is fixed to the final stage output shaft 44 of the drive device provided in the arm. It meshes with spur gear 26. A guide pulley 29 is rotatably attached to the tubular shaft 27, and an electrode guide 33,
A bracket 32 that supports 34 is fixed.

The rotary cylinder 4 and the work tables 9 and 14 are provided with first and second through holes a and b, which may be common, through which the wire electrode 38 passes, and are supplied from a supply device (not shown), and are indicated by arrows in the figure. The wire electrode 38 that is moved in the direction first enters the center hole of the tubular shaft 27 through the electrode guide 36 on the final fixed side, passes through the first through hole a of the electrode unit, and then
electrode guide 18 attached to the electrode guide column 17;
19, 20, 21, 22, 23 and 24 in sequence, passes through the second through hole b, passes through the electrode guides 33 and 34, and goes around the guide pulley 29 once or twice, and then the first fixed electrode It passes through a guide 37 and is collected by a collection device (not shown).

When processing is performed using this electrode unit 2, a workpiece (not shown) is processed using the wire electrode 38a between the electrode guides 20 and 21. Rotate the electrode guide column 17 so that it does not come into contact with the workpiece.
It is necessary to evacuate. In this embodiment, this rotation is performed via a rotation device provided within the arm 1. That is, the rotating cylinder 4, the cross table 15, and the electrode guide column 1 are connected by the spur gears 26 and 25.
7. The tubular shaft 27, the bracket 32, and all electrode guides attached thereto rotate integrally.

Therefore, during this rotational movement, the electrode guide 3
4 and the guide pulley 29 change, and the number of turns of the wire electrode 38 wound around the guide pulley 29 changes, but the electrode path inside the electrode unit 2 changes.
It only rotates around the above-mentioned central axis of rotation (which is the same as the central axis of the wire electrode 38a), and its geometrical shape remains unchanged. The electrode path from the electrode guide 37 to the collection device is stationary.

The angle at which the electrode guide column 17 is rotated is usually ±
Since the angle is within 180°, and at most ±270°, if the wire electrode 38 is wound back and forth around the guide pulley 29 once or twice, the electrode guide column 1
7 rotates, the only change is the length of the wire electrode 38 wound around the guide pulley 29, that is, the number of turns, so the tension acting on the wire electrode 38 in other parts remains unchanged. Therefore, if the wire electrode unit according to the present invention is used, the wire electrode 38 in the electrode path and the wire electrode 38a between the electrode guides 20 and 21 can be fixed even when the electrode unit is rotated.
It has no effect on the tension applied to the
Therefore, machining accuracy is maintained high, and wire breakage due to rotation of the wire electrode 38 does not occur even when rotated at high speed, so machining accuracy, machining operation,
It is convenient in terms of handling and operation, and since there is no fear that the wire electrodes will come into contact with each other or get tangled during processing, safe and reliable processing can be performed.

Next, FIG. 2 will be explained.

FIG. 2 is a perspective view of the top of one embodiment of the electrode unit.

In the figure, 39 is a rotating cylinder, 40 is a guide pulley, 41 is a tubular shaft, 42 is an electrode guide supported by an arm, and 43 is a wire electrode.

In this embodiment, the guide pulley 40 is fixed to the rotary cylinder 39 via a tubular shaft 41, and is rotated integrally therewith.

The rest of the device is similar to the previous embodiment. At the center of the device is a first through hole a into which the wire electrode is drawn, and parallel to this is a second through hole b which forms a return path for the wire electrode.
The first and second through holes a and b may be one common hole.

A notch 40a is provided in the flange of the guide pulley 40, which functions as an electrode guide instead of the electrode guides 33, 34 in the embodiment shown in FIG. That is, this notch 40a is located directly above the second through hole b, and the wire electrode pulled out from the second through hole b is hooked to this notch 40a.
Next, the guide pulley 40 is rotated half a turn or once or twice, and then recovered by a recovery device (not shown). In this embodiment, since the guide pulley 40 rotates together with the rotating cylinder 39, even if these rotate, the length of the wire electrode wound around the guide pulley 40, that is, the number of turns, only changes; The shape of the path of the wire electrode in the section remains unchanged, and therefore, in this embodiment as well, there is no change in tension applied to the electrode, no disconnection, or no tangle due to the rotation of the electrode guide column.

Since the present invention is configured as described above, when the present invention is used, the tension applied to the wire electrode changes, the wire breaks, or even becomes tangled during use.
It is possible to provide an electrode unit for a wire-cut electric discharge machining apparatus that can perform machining safely, reliably, and with high precision without becoming entangled. The working electrode unit of the present invention has a drum for storing and winding wire electrodes, a capstan for drawing out wire electrodes, a pinch roller, a brake drum for applying tension, a pinch roller, etc., installed in a fixed part such as a column. It can be used by being attached to this type of wire cut electric discharge machine.

Note that the configuration of the present invention is not limited to the above-mentioned embodiments, and for example, the shape of the electrode guide of each part,
The structure of the supporting device for the electrode guide column, the rotation method, etc. may be freely modified within the scope of the purpose of the present invention, and the present invention encompasses all of these.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway side view showing one embodiment of an electrode unit according to the present invention, and FIG. 2 is a perspective view showing essential parts of another embodiment. 1... Arm of wire cut electric discharge machining equipment, 2
...Electrode unit, 3...Fixed tube that serves as a mounting part,
4...Rotating tube, 15...Cross table, 17...
...Electrode guide column, 18, 19, 20, 21, 2
2, 23, 24, 33, 34, 36, 37, 42
... Electrode guide, 25, 26 ... Spur gear, 27,
39... Tubular shaft, 29, 40... Guide pulley, 3
2... Bracket, 38, 43... Wire electrode.

Claims (1)

[Scope of Claims] 1. An electrode unit for a wire-cut electric discharge machining device comprising the components described in the following items a to e. a. An electrode guide column having a plurality of electrode guides that allow the wire electrode to travel along a substantially U-shaped electrode path. b. A mounting part that can be detachably and rotatably attached to the arm of a desired wire-cut electrical discharge machining device;
It has a first through hole for inserting a wire electrode provided concentrically with the rotation center axis, and a second through hole provided approximately parallel to the first through hole, and one end thereof. An electrode guide post support device to which the electrode guide post is attached. c. A tubular shaft attached to the opening of the first through hole at one end of the electrode guide column support device opposite to the side to which the electrode guide column is attached. d a guide pulley that is provided coaxially with the tubular shaft and around which a wire electrode that enters and exits the second through hole is wound; e A wire that is provided near the opening of the second through hole at one end of the electrode guide post support device on the side opposite to the side where the electrode guide post is attached, and that goes in and out of the second through hole. at least one external electrode guide for guiding an electrode between the second through hole and the guide pulley; 2. The electrode guide column support device, the tubular shaft, and the electrode guide column are firmly connected so as to rotate integrally,
The electrode unit for an electric discharge machining apparatus according to claim 1, wherein the guide pulley is rotatably provided coaxially with the tubular shaft. 3. Claims in which the electrode guide post support device, the tubular shaft, the electrode guide post, and the guide pulley are firmly connected to rotate integrally, and the external electrode guide is a notch or protrusion provided on the guide pulley. 2. The electrode unit for a wire-cut electric discharge machining apparatus according to item 1.