JPS61226228A - Wire-cut electric discharge machine - Google Patents

Abstract

PURPOSE:To carry out either one of a wire-cut electric discharge machining process and an engraving process, by journalling a pair of electrode guides and an electrode fold-back guide in a reciprocating two-wire type wire-cut electric discharge machining device, rotatably about a common axis. CONSTITUTION:When a workpiece 10 is subjected to an wire-cut electric discharge process, a wire-electrode is fed from a wire electrode supply drum, passing through a first electrode guide 7 and a thin hole for the machining start hole of the workpiece 10, and after being folded back by a wire electrode fold-back roller 9, is recovered onto a wire electrode recovery drum, passing through a second electrode guide 8 and the first electrode guide 7. When an engraving process is carried out, a part of the wire electrode 2 which makes into contact with the wire electrode fold-back roller 9 is used as a machining electrode.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention can perform wire cut electric discharge machining in which one wire electrode is folded back and machining is performed using two reciprocating wire electrodes, and electric discharge die carving. This article relates to a new electrical discharge machining device.

[Conventional technology]

Generally, wire-cut electrical discharge machining equipment has the problem that it cannot perform die-sinking on a workpiece, and no device has yet been developed that can perform both wire canting and die-sinking in one device.

The present inventor first installed a first arm or processing head on the side that supplies and collects the wire electrode, and a wire electrode supplied from the first arm or processing head side into the guide groove of the guide roller. a second arm or processing head comprising a wire electrode automatic folding guide roller for guiding and folding the wire electrode; and a wire electrode automatic folding guide of the second arm or processing head for guiding the wire electrode from the side of the first arm or processing head. An electrode conveying device that conveys the electrode to a roller and passes it over, a device that holds the workpiece, and a wire electrode that reciprocates between the workpiece and the first and second arms or processing heads are arranged adjacent to each other and opposite to each other. a power supply device and a power supply device that apply voltage pulses for electric discharge machining between the workpiece and the wire electrode; A wire-cut electric discharge machining apparatus has been proposed, which is equipped with a feeding device and performs machining using a wire electrode that reciprocates between the first and second arms or the machining head.

In the wire-cut electrical discharge machining apparatus described above, one wire electrode is folded back by the guide roller to form two reciprocating wire electrodes, and machining is performed using these two reciprocating wire electrodes.
The machining gap formed by the wire electrode and the workpiece is widened, and therefore a sufficient amount of machining fluid can be supplied to the machining gap. By controlling the direction in relation to the direction of machining feed, it is possible to perform finishing machining with the one of the two reciprocating wire electrodes that has not been damaged by electrical discharge, so it is possible to obtain a good finished surface. can.

Therefore, it would be extremely advantageous if this wire-cut electrical discharge machining apparatus could perform die engraving.

[Problems to be solved by the present invention]

The present invention was made from the viewpoint of ridges, and its purpose is to enable wire-cut electric discharge machining and die-sinking machining depending on the purpose of machining, shape, etc.
Furthermore, the present invention aims to provide an apparatus that can perform die engraving without using expensive processing electrodes and with virtually no electrode wear.

[Means for solving problems]

The above object is to hold the folded wire electrode by an electrode folding guide in a reciprocating two-wire type wire-cut electric discharge machining device in which one wire electrode is folded back and machined as two reciprocating wires. provided on a common axis to obtain
A pair of electrode guides supported so as to be movable in biaxial directions relative to the workpiece, and the electrode folding guide are moved in parallel together with the pair of electrode guides, and the electrode guides are supported in a common uniaxial direction of the pair of electrode guides. This is achieved by providing a device that is movably and rotatably supported around its axis.

[For production]

With the above configuration, machining can be performed by appropriately selecting either wire-cut electric discharge machining or die-sinking machining according to the shape to be machined, and moreover, machining can be performed without expensive machining. Since machining can be performed without using a machining electrode and with virtually no electrode wear, good machining can be performed efficiently in a short time.

〔Example〕

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

1 and 2 are explanatory diagrams showing one embodiment of a wire-cut electrical discharge machining apparatus according to the present invention, and FIG. 1 shows an example in which the above-mentioned apparatus is operated as a wire-cut electrical discharge machining apparatus to perform machining. FIG. 2 is an explanatory diagram showing a state in which the above-mentioned apparatus is operated as a processing device to perform processing. FIG. 3 is an enlarged sectional view of the wire electrode folded roller portion, and FIG. 5 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, 1 is an arm or a processing head, which is attached to a column or the like (not shown) set up on the bed of a processing machine. 2 is a wire electrode, 3 is a pinch roller, 4 is a brake roller, 5 is a pinch roller, 6 is a capstan, 7 and 8 are the wire electrodes 2 that are folded back by the wire electrode folding roller 9 to hold the wire electrodes 2 that are reciprocating. 1 and 2nd electrode guides, 10.10' is the workpiece,
Reference numeral 10a indicates a pore for a processing start hole formed in the workpiece IO, and reference numerals 11 and 12 indicate holes for rotating the first and second electrode guides 7 and 8 synchronously via gears 13 and 14, and 15 and 16. 17 is a support arm to which the motor 12 is attached and rotatably supports the guide holder 18; 19 is a bearing; 20 is the arm or the tip of the rod 21 attached to the processing head 1; 22 is a linear encoder that detects the amount of movement of the loft 21; 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 a rod 2 for holding the workpiece 10;
a mounting member 28 fixed at a constant height position via 7;
and 29 are mounted on the base 30 and the workpiece 10 is
Cross slide table that moves in the axis and Y axis directions, 3
1 is a turntable mounted on the cross slide table 28 and imparts rotational motion to the workpiece 10; 3;
2 and 33 are the cross slide tables 28, respectively.
and 29, and 34 is a feed screw.

Incidentally, motors 11 and 12 and a hydraulic cylinder 20 are used to rotate the first and second electrode guides 7 and 8 in synchronization.
a hydraulic switching valve 23 that switches the flow of oil to a power source (not shown) that applies machining voltage pulses to the machining gap formed by the wire electrode 2 and the workpiece 10 via a power supply roller or an electrode guide, etc. The apparatus, a machining fluid supply device (not shown) that controls the spouting amount of machining fluid, and each motor 32, 33 that operates the turntable 31, cross slide table 28, 29, etc. have a built-in numerical control device (not shown). The system is configured to be controlled all at once by a central control unit.

The arm or processing head 1 includes a pinch roller 3, a brake roller 4, a capstan 5, a pinch roller 6, a first electrode guide 7, and a gear 13 that connects the electrode guide 7 with the gear 13.
．． Motor 11 and hydraulic cylinder 20 that rotate via 14
Also, a wire electrode supply drum, a wire electrode collection drum, etc. (not shown) are built-in.

A gear 14 is attached to the first electrode guide 7, and meshes with a gear I3 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 connected to the hydraulic cylinder 20 from the hydraulic pump 24.
The flow of oil supplied to the cylinder is switched up and down by the hydraulic switching valve 23.

Further, the support arm 17 includes an arm or a processing head 1.
Motor 1 that rotates in synchronization with motor 11 built in
2 is fixed, and a guide holder 18 is rotatably supported. The wire electrode folding roller 9 is rotatably supported on the guide holder 18, and a second electrode guide 8 and a gear 16 are attached to the guide holder 18, and the gear 16 is a gear attached to the shaft 12a of the motor 12. It meshes with 15.

The guide holder 18 is raised and lowered by the hydraulic cylinder 20, and rotated by the motor 12.

When the workpiece 10 is machined by wire-cut electrical discharge machining, it is fixed at a fixed height position by a mounting member 26 and attached to the turntable 3, as shown in FIG.
1 provides rotational motion, and cross slide tables 28 and 29 provide motion in the X- and Y-axis directions. Further, when machining is performed by electric discharge machining, the workpiece 10 is placed on the turntable 31.
It is mounted on top and subjected to the above motion to perform processing.

When the workpiece 10 is machined by wire-cut electric discharge machining, the pinch roller 3 and the brake are supplied from the wire electrode supply drum (not shown) housed in the first arm or the machining hand l. After passing through roller 4, the first
The wire electrode passes through the processing start hole 10a of the workpiece 10 from the electrode guide 7, and is folded back from the second electrode guide 8 by the wire electrode folding roller 9, and then from the second electrode guide 8 to the first electrode. Pass guide 7 and capstan 5
and a pinch roller 6, and is collected into a wire electrode collection drum (not shown).

The two reciprocating wire electrodes 2 are held in close contact with each other in parallel by the first and second electrode guides 7 and 8, and a turntable 3 is attached to the workpiece 10.
1 and cross slide tables 28 and 29, a relative machining feed motion is applied to the workpiece 10 on a common axis, and a machining liquid supply device (not shown) is applied to the machining gap of the workpiece 10. A machining fluid is jetted and supplied, and a machining voltage pulse is applied 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 to perform machining.

During processing, the two wire electrodes 2 that reciprocate have first and second electrode guides 7 that may be kept constant during the wire cutting process, but may be operated synchronously in some cases.
and 8, it is controlled to face in a desired direction during machining, for example, in the direction of the cutting line of the machining contour.

When the workpiece 10' is subjected to processing such as die-sinking, as shown in FIG. will be installed on.

When performing die engraving, the portion of the wire electrode 2 that is in contact with the wire electrode folding roller 9 is used as a processing electrode, as shown in FIGS. 3 and 4.

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

During electrical discharge machining, the wire electrode folding roller 9 is given rotational motion by the motor 12 via the guide holder 18, and also given vertical motion by the hydraulic cylinder 20. The amount of movement of the rod 21 of the hydraulic cylinder 20 is sequentially detected by a linear encoder 22, and this detected value is input to a control device having a built-in numerical control device (not shown).

The wire electrode folding roller 9 is given vertical movement and rotational movement based on control signals from the control device, and the workpiece 10' is provided with a turntable 31.
Machining is performed while being given a predetermined rotational movement and moving movement in the X-axis and Y-axis directions by the cross slide tables 28 and 29.

In addition to the wire electrode folding roller 9 shown in FIGS. 1 to 4, when performing a large die engraving process, the wire electrode folding roller 3 is attached to the guide holder 18' as shown in FIG.
It is recommended to use a type with two 5.36.

〔Effect of the invention〕

Since the present invention is configured like a ridge, when using the present invention, machining can be performed by appropriately selecting either wire cut electric discharge machining or die-sinking machining depending on the shape of the machining, etc. In electric discharge machining, machining can be performed without using expensive machining electrodes and with virtually no electrode wear, so good machining can be performed efficiently in a short time.

Note that the present invention is not limited to the embodiment on ridges. That is, for example, in this embodiment, during wire cut electrical discharge machining, the wire electrode folded back by the wire electrode folding roller is held in close contact with each other in parallel by the first and second electrode guides, and the wire electrode is held close to the workpiece by the first and second electrode guides. Although the workpiece was moved in two axial directions within a perpendicular plane, the workpiece was kept fixed and the wire electrodes were held in close contact with each other in parallel with each other by the first and second electrode guides. 1st and 2nd
The electrode guide may be supported so as to be relatively movable in two axes within a plane perpendicular to the workpiece. Also,
The wire electrode folding roller 9 rotatably supported by the guide holder 18 is connected to the hydraulic cylinder 20 via the support arm 17.
However, the hydraulic cylinder is not limited to this, and other known lifting devices can be used. Furthermore, although it has been described that a processing voltage pulse is applied to the wire electrode via a power supply roller or an electrode guide, the present invention is not limited to the power supply roller, and a known guide die, boat-shaped guide, or the like can be used. Further, the number of wire electrode folding rollers attached to the guide holder, their mounting positions, etc. can be changed as appropriate depending on the shape of the engraving process, etc. others,
The method of mounting the workpiece, the method of moving it, the method of controlling each part, etc. can be freely changed within the scope of the purpose of the present invention, and the present invention encompasses all of them. .

[Brief explanation of the drawing]

1 and 2 are explanatory diagrams showing one embodiment of a wire-cut electrical discharge machining apparatus according to the present invention, and FIG. 1 shows an example in which the above-mentioned apparatus is operated as a wire-cut electrical discharge machining apparatus to perform machining. FIG. 2 is an explanatory diagram showing a state in which the above apparatus is operated as a processing device to perform processing, FIG. 3 is an enlarged sectional view of the wire electrode folded roller portion, and FIG. Its longitudinal cross-sectional view, FIG.
It is an explanatory view showing other examples of a wire electrode folding roller part.

Claims (1)

[Scope of Claim] In a reciprocating two-wire type wire-cut electric discharge machining device in which one wire electrode is folded back and machined as two reciprocating wires, a wire electrode that is folded back can be held by an electrode folding guide. A pair of electrode guides provided on one axis and supported so as to be movable in biaxial directions relative to the workpiece, and the electrode folding guide are moved in parallel together with the pair of electrode guides. The above-mentioned wire-cut electric discharge machining apparatus includes a device for supporting the electrode guide so as to be movable in a common uniaxial direction and rotatably around the axis.