JPH0761575B2 - Wire cut electrical discharge machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention can perform wire-cut electric discharge machining in which a single wire electrode is folded back and machined with two reciprocating wire electrodes, and electric discharge engraving. The present invention relates to a novel electric discharge machine.

[Conventional technology]

Generally, there is a problem that the wire-cut electric discharge machining device cannot perform the die-cutting process on the workpiece, and a device capable of performing the wire-cutting and the die-cutting process with one device has not yet been developed.

The present inventor firstly provided the first arm or processing head on the side for supplying and recovering the wire electrode and the wire electrode supplied from the side of the first arm or processing head in the guide groove of the guide roller. A second arm or machining head having a wire electrode automatic folding guide roller for guiding and folding back, and a wire electrode automatic folding guide for the wire electrode from the side of the first arm or machining head. An electrode transporting device that transports and hangs up to a roller, a device that holds a workpiece, and a wire electrode that reciprocates between the workpiece and the first and second arms or processing heads are adjacently opposed to each other. A machining feed device, a power supply device for applying a voltage pulse for electric discharge machining between the work piece and the wire electrode, and a power feeding device, and the work piece and the wire electrode are made to approach and face each other. The provided a device for supplying a machining liquid to the machining gap, and proposed a wire cut electric discharge machining apparatus for machining by the wire electrode to reciprocate between the first and second arms or machining head.

Thus, in the above wire-cut electric discharge machine, one wire electrode is folded back by the guide roller to form two reciprocating wires, and machining is performed by the two reciprocating wire electrodes.
The machining gap portion formed by the wire electrode and the workpiece is widened, and therefore a sufficient amount of machining liquid can be supplied to the machining gap. Further, the arrangement of the two reciprocating wire electrodes or the arrangement thereof. By controlling the direction in relation to the direction of the machining feed, it is possible to perform the finishing process with the wire electrode that has not been damaged by the electrical discharge of the two wire electrodes that are reciprocating, so that a good finished surface can be obtained. it can.

It would be extremely convenient if the wire-cut electric discharge machine could be used for die engraving.

[Problems to be Solved by the Present Invention]

The present invention has been made from the above point of view, and the purpose thereof is to perform wire-cut electric discharge machining and die-sinking according to the purpose of machining, shape, etc.,
Moreover, it is an object of the present invention to provide an apparatus capable of performing machining in die-cutting without using expensive machining electrodes and with substantially no electrode consumption.

[Means for solving problems]

Thus, the above object is to provide a reciprocating two-wire type wire-cut electric discharge machining device in which a single wire electrode is folded back, two reciprocating wire electrodes are brought into contact with each other, and run in opposite directions to perform machining. A pair of electrode guides provided on one common axis so as to hold the wire electrode folded by the wire electrode folding roller, two wire electrodes reciprocating between the pair of electrode guides, and a workpiece to be cut Between the pair of the electrode guides and the wire electrode folding roller and the work piece in order to provide a relative machining feed between them, and relative movement in two axial directions orthogonal to the common one axis and orthogonal to each other. Device, the work piece installation part mounted and supported on the relative motion imparting device to hold the work piece to be cut, and the wire electrode folding roller and its wire electrode folding roller. A device for movably supporting the other electrode guide in the common uniaxial direction and a workpiece to be engraved, which is provided on the relative motion imparting device, in the common uniaxial direction, the electrode The wire-cut electric discharge machine according to claim 1, further comprising: another work piece installation portion for installing the work piece on a side opposite to the guide so as to face the wire electrode folding roller.

Can be achieved by

[Action]

Thus, if configured as described above, it is possible to perform processing while appropriately selecting either wire-cut electric discharge machining or die-sinking machining according to the machining shape and the like, and it is expensive in machining. Since it is possible to perform processing without using a processing electrode and substantially without electrode consumption, good processing can be efficiently performed in a short time.

〔Example〕

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

1 and 2 are explanatory views showing an embodiment of a wire-cut electric discharge machining apparatus according to the present invention. FIG. 1 shows that the above apparatus is operated as a wire-cut electric discharge machining apparatus for machining. 2 is an explanatory view showing a state in which the above device is operated as a die-cutting device to perform processing, and FIG. 3 is an enlarged sectional view of a wire electrode folding roller portion. FIG. 4 is a longitudinal sectional view thereof, and FIG. 5 is an explanatory view showing another embodiment of the wire electrode folding roller portion.

In FIGS. 1 and 2, reference numeral 1 denotes an arm or a processing head, which is attached to a column or the like standing on a bed of a processing machine (not shown). 2 is a wire electrode, 3 is a pinch roller, 4 is a brake roller, 5 is a pinch roller, 6
Is a capstan, and 7 and 8 are first and second ones provided on one common axis (Z axis) so as to hold the wire electrode 2 that is folded back by the wire electrode folding roller 9 and is made into two reciprocating wires. Electrode guides, 10 and 10 'are workpieces, 10a are pores for machining start holes formed in the workpiece 10, 11a
And 12 gear the first and second electrode guides 7 and 8
A motor for synchronously rotating via 13 and 14, 15 and 16, 17 is a support arm for mounting the motor 12 and rotatably supporting a guide holder 18, 19 is a bearing, 20 is the arm or A hydraulic cylinder provided in the processing head 1, 21 is a rod of the hydraulic cylinder 20 having the support arm 17 attached to its tip, and 22 is the rod 21.
Is a linear encoder for detecting the amount of movement of the hydraulic cylinder, 23 is a hydraulic switching valve that switches the flow of oil to the hydraulic cylinder 20, 24 is a hydraulic pump, 25 is an oil tank, 26 is the rod to which the workpiece 10 is attached.
A mounting member for fixing the work piece 10 at a constant height position via 27, 28 and 29 are mounted on a base 30, and the workpiece 10 is orthogonal to the Z axis, and X and Y axes orthogonal to each other. A cross slide table that moves in a direction, 31 is a turn table that is mounted on the cross slide table 28 and that imparts rotational motion to the workpiece 10, 32 and 33 are motors that drive the cross slide tables 28 and 29, respectively. 34 is a lead screw.

It should be noted that motors 11 and 12 that rotate the first and second electrode guides 7 and 8 in synchronization with each other, a hydraulic switching valve 23 that switches the flow of oil to the hydraulic cylinder 20, a wire electrode 2 and the workpiece 10. Power supply device (not shown) that applies a processing voltage pulse through a power supply roller or an electrode guide between the processing gaps that are formed by the processing liquid supply device (not shown) that controls the jetting amount of the processing liquid, and a turntable. 31 and each motor 3 for operating the cross slide tables 28, 29
2, 33, etc. are configured to be collectively controlled by a central control unit having a built-in numerical control unit (not shown). Further, as shown in FIG. 2, the turntable 31 serves as an installation portion of the workpiece 10 'when performing the die-cutting process.

In the arm or the processing head 1, the pinch roller 3, the brake roller 4, the pinch roller 5, the capstan 6, the first electrode guide 7, the electrode guide 7 and the gear 13,
A motor 11, which rotates via 14, a hydraulic cylinder 20, an unillustrated wire electrode supply drum, a wire electrode recovery drum, and the like are incorporated.

A gear 14 is attached to the first electrode guide 7,
It meshes with a gear 13 attached to the shaft 11a of the motor 11.

The support arm 17 is attached to the rod 21 of the hydraulic cylinder 20, and is moved up and down by switching the flow of oil supplied from the hydraulic pump 24 to the hydraulic cylinder 20 by the hydraulic switching valve 23.

A motor 12 that rotates in synchronization with a motor 11 built in the arm or the processing head 1 is fixed to the support arm 17, and a guide holder 18 is rotatably supported. A wire electrode folding roller 9 is rotatably supported by the guide holder 18, and the second electrode guide 8 is also supported.
And a gear 16 are attached, and the gear 16 is a motor.
It meshes with a gear 15 attached to 12 shafts 12a.

Thus, the guide holder 18 is moved up and down by the hydraulic cylinder 20, and the motor 12 gives a rotational movement.

When cutting is performed on a workpiece by wire-cut electric discharge machining, the workpiece 10 is cut as shown in FIG.
It is mounted on a mounting member 26 which is held at a constant height by a rod 27 (in the illustrated embodiment, the mounting member 26
And the rod 27 constitute an installation portion of the workpiece to be cut), the rotary motion is given by the turntable 31, and the X-axis direction and the Y-axis direction are given by the cross slide tables 28 and 29. . Further, when the die-sinking is performed by electric discharge machining, the workpiece 10 'is mounted on the turntable 31 as its installation portion as shown in FIG. 2, and in addition to the above movement, the wire electrode folding back is performed. The roller 9 is given a motion in the Z-axis direction (vertical direction in the drawing) for processing.

When the workpiece 10 is processed by wire cut electric discharge machining, the first arm or the machining head 1
From the wire electrode supply drum (not shown) housed inside the pinch roller 3 and the brake roller 4, from the first electrode guide 7 to the processing start hole pore 10 of the workpiece 10.
After passing through a and being folded back from the second electrode guide 8 by the wire electrode folding roller 9, the second electrode guide 8 passes through the first electrode guide 7, passes through the pinch roller 5 and the capstan 6, It is collected by a wire electrode collecting drum (not shown).

Thus, the two reciprocating wire electrodes 2 are closely held in parallel with each other by the first and second electrode guides 7 and 8, and the workpiece 10 has a turntable 31 and a cross slide. By the tables 28 and 29, machining feed motions in the X-axis and Y-axis directions that are orthogonal to one common axis (Z-axis) connecting the electrode guides 7 and 8 and are orthogonal to each other are given, and the workpiece 10 is machined. A machining liquid is jetted and supplied from a machining liquid supply device (not shown) to the gap, and a machining voltage pulse is further supplied to the wire electrode 2 and the workpiece 10 from a power supply device (not shown) via a power supply roller or an electrode guide. It is applied and processing is performed.

During the machining, the direction of the two reciprocating wire electrodes 2 may be kept constant during the wire-cutting process, but in some cases, the first and second electrode guides 7 are operated synchronously. The control is performed by 8 so as to face a desired direction during processing, for example, a direction of a tangent to the processing contour line.

Further, when the workpiece 10 'is subjected to machining such as die-sinking, it is processed by electric discharge machining as shown in FIG.
Mounted on.

When performing the die-cutting process, the folded portion of the wire electrode 2 which is in contact with the wire electrode folding roller 9 is used as a machining electrode as shown in FIGS. 3 and 4.

In the case of die-sinking electric discharge machining, it is also recommended to use a so-called tape electrode such as a tape-shaped or net-shaped body in addition to the wire electrode 2.

Thus, at the time of die-sinking electric discharge machining, the wire electrode folding roller 9
The motor 12 is given a rotational movement through the guide holder 18 and a hydraulic cylinder 20 gives a vertical movement. Rod 21 of the hydraulic cylinder 20
The moving amount of is sequentially detected by the linear encoder 22,
This detected value is input to a control device (not shown) having a built-in numerical control device.

Thus, the wire electrode folding roller 9 is given a vertical motion and a rotary motion based on a control signal from the controller, and the workpiece 10 'is provided with a turntable 31 and cross slide tables 28, 29. Machining is performed while given a predetermined rotational movement and movement movement in the X-axis and Y-axis directions.

In addition to the wire electrode folding roller 9 shown in FIGS. 1 to 4, the wire electrode folding roller 35 is attached to the guide holder 18 'as shown in FIG.
It is recommended to process using a type with two 36s.

〔The invention's effect〕

Since the present invention is configured as described above, according to the present invention, it is possible to perform machining while appropriately selecting either one of wire-cut electric discharge machining or die-stamping machining according to the shape of machining and the like. In the processing, since it is possible to perform the processing without using an expensive processing electrode and with substantially no electrode consumption, it is possible to efficiently perform a good processing in a short time.

The present invention is not limited to the above embodiments. That is, for example, in the present embodiment, the wire electrodes folded back by the wire electrode folding roller at the time of wire cut electric discharge machining are held in close contact with each other by the first and second electrode guides in parallel with each other, and are held on the workpiece. On the other hand, a moving movement in two axial directions was given within a plane perpendicular to the stretching direction of the wire electrode 2, but the work piece was fixed and the wire electrodes were parallel to each other by the first and second electrode guides. The first and second electrode guides may be supported so as to be relatively movable in two axial directions in a plane perpendicular to the stretching direction of the wire electrode 2. Further, the wire electrode folding roller 9 rotatably supported by the guide holder 18 is moved up and down by the hydraulic cylinder 20 via the support arm 17, but the invention is not limited to the hydraulic cylinder and other known lifting devices are used. it can. Furthermore, although it has been described that the processing voltage pulse is applied to the wire electrode via the power feeding roller, the electrode guide or the like, it is not limited to the power feeding roller or the like, and known guide dies or boat-shaped guides can be used. Further, the number of wire electrode folding rollers to be attached to the guide holder, the attachment position thereof, and the like can be appropriately changed depending on the shape of the die-cutting process and the like. In addition, the method of attaching the work piece, the method of moving the work piece, the method of controlling each part, and the like can be freely designed and changed within the scope of the object of the present invention, and the present invention includes all of them. is there.

[Brief description of drawings]

1 and 2 are explanatory views showing an embodiment of a wire-cut electric discharge machining apparatus according to the present invention. FIG. 1 shows that the above apparatus is operated as a wire-cut electric discharge machining apparatus for machining. 2 is an explanatory view showing a state in which the above device is operated as a die-cutting device to perform processing, and FIG. 3 is an enlarged sectional view of a wire electrode folding roller portion. FIG. 4 is a longitudinal sectional view thereof, and FIG. 5 is an explanatory view showing another embodiment of the wire electrode folding roller portion. 1 ... Arm or processing head 2 ... Wire electrode 3, 5 ... Pinch roller 4 ... Brake roller 6 ... Capstan 7 ... First electrode guide 8 ... Second electrode guide 9, 35, 36 ...... Wire electrode folding roller 10, 10 '...... Work piece 11, 12, 32, 33 ...... Motor 13, 14, 15, 16 ...... Gear 17 ...... Support arm 18, 18' ...... Guide holder 19 ... … Bearing 20 …… Hydraulic cylinder 21,27 …… Rod 22 …… Linear encoder 23 …… Hydraulic switching valve 24 …… Hydraulic pump 25 …… Oil tank 26 …… Mounting member 28,29 …… Cross slide table 30 …… Base 31 …… Turntable 34 …… Feed screw

Claims (1)

[Claims] 1. A reciprocating two-wire type wire-cut electric discharge machine for folding a single wire electrode (2) and causing two reciprocating wire electrodes to come into contact with each other and run in opposite directions. Between the pair of electrode guides (7, 8) provided on one common axis so as to hold the wire electrode (2) folded by the electrode folding roller (9), and between the pair of electrode guides (7, 8) The pair of electrode guides (7, 8) and the wire electrode folding roller to provide a relative machining feed between the two wire electrodes (2) and the workpiece (10) to be cut. A device (28, 29, 32, 3) for imparting relative motion between the (9) and the workpiece (10) in two axial directions orthogonal to the common one axis and mutually orthogonal.
3,34) and the workpiece to be cut (10) to be held,
The workpiece mounting portion (26, 27) mounted and supported on the relative motion imparting device, the wire electrode folding roller (9) and the electrode guide (8) closer to the wire electrode folding roller (9) are common to the above. A device (17, 20-23) that is movably supported in one axial direction, and a workpiece (10 ') that is provided on the relative motion imparting device and that is to be die-machined in the common one axial direction. , Another work piece installation portion (31) for installing the work piece on a side opposite to the electrode guide (8) so as to face the wire electrode folding roller (9). The wire-cut electric discharge machine described above.