JPS62162428A - Wire-cut electric discharge machine - Google Patents

Abstract

PURPOSE:To enhance the accuracy of machining, by providing a pressing wire guide for pressing a wire, a locating wire guide for determining the position of the wire and a relieving wire guide for relieving a distortion of the wire, in a wire-cut electric discharge machining device. CONSTITUTION:A relieving wire guide 6 for relieving a distortion of a wire caused by pressing is disposed between a pressing wire guide 3 and a locating wire guide 4, and is formed in a ring-like shape. The wire 1 reaches the relieving wire guide 6 by way of wire guides 2, 3. At this time the wire 1 is inclined by an angle of phi with respect to the axis of the relieving wire guide 4. However, since the locating wire guide 4 is laid on the same axis as that of the relieving wire guide 6, it is inclined by an angle of theta which is less than the angle theta with which the wire 1 reaches the wire guide 4, and therefore, there is no substantial distortion in the wire 1 in such a phase that the wire goes through the guide 4 to a workpiece 5.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a wire-cut electric discharge machine.

In particular, it relates to improving machining accuracy.

[Conventional technology]

FIG. 3 is a configuration diagram showing the arrangement of wires, wire guides, and workpieces of a conventional wire-cut electric discharge machine. In the figure, (1) is a wire, (2) is a wire guide, (3) is a pressing wire guide that presses the wire (1) in a predetermined direction, rightward in this figure;
(41 is provided between the pressing wire guide (3) and the workpiece (5), and the wire fi+
This is a positioning wire guide that determines the position of the Also 9
In the figure, ΔX is the amount of deformation of the wire fi+.

The operation will be explained next, with θ indicating the tilt angle. For example, apply a positive voltage to the wire +1+ through the pressing wire guide (3), and apply a positive voltage to the workpiece (5).
When a negative voltage is applied to 1, a discharge phenomenon occurs at the intersection of 1 and 1, and the workpiece (5) is melted and processed. The electrical discharge energy generated between the workpiece (5) and the wire (1) melts not only the workpiece (5) but also the wire (1), so the wire t1+ always moves in a certain direction, for example in the direction of the arrow in the figure. We need to continue sending and supplying it. At this time, in order to stably supply current to the moving wire (1), the pressing wire guide (3), which serves as the power feeding wire guide, must be brought into contact with the wire (1) under a constant surface pressure. . Therefore, wire guide (2) and positioning wire guide (4)
) This contact surface pressure is generated by mounting the pressing wire guide (3) offset with respect to the axis formed by the wire. [Problems to be solved by the invention] Conventional wire-cut electrical discharge machining The machine is constructed as described above, and since the wire (1) is pressed by the pressing wire guide (3), it is at an angle to the axis of the positioning wire guide (4) (indicated by the dashed line in the figure). It will be arranged with a distortion of θ. As a result, the wire (1) draws a curve, causing a displacement of ΔX with respect to the workpiece (5), resulting in a problem that processing accuracy is reduced.

This invention was developed in order to solve the above-mentioned problems, and it alleviates the distortion of the wire (1) with respect to the axis of the positioning wire guide (4), thereby achieving wire-cut electric discharge machining with improved machining accuracy. The purpose is to obtain an opportunity.

[Means for solving problems]

A wire-cut electrical discharge machine according to the present invention is a pressing wire guide that suppresses a wire in a predetermined direction.

Provided between this pressing wire guide and the workpiece,
A positioning wire guide that determines the position of the wire with respect to the workpiece, and a relaxing wire guide that is provided between the pressing wire guide and the positioning wire guide and relaxing the distortion caused by pressing the wire. It is something.

The relaxation wire guide of the present invention alleviates distortion caused by suppression of the wire and prevents the wire from being displaced with respect to the workpiece.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
The figure is a configuration diagram showing the main parts of a wire-cut electric discharge machine according to an embodiment of the present invention, and FIG. 2 is an explanatory diagram showing a section A in FIG. 1 on an enlarged scale. In the figure, (61 is a relaxation wire guide that is provided between the pressing wire guide (3) and the positioning wire guide (4) and that relieves the distortion caused by the suppression of the wire (1). In this example, a ring Please note that Δy is the relaxation wire guide (61
The difference between the inner diameter of the wire (υ) and the outer diameter of the wire (for example, 5 μm,
d indicates the outer diameter of the wire +17, for example 200μrn,
l indicates the distance between the positioning wire guide (4) and the relaxation wire guide (6); for example, 5: rrts, θ
, ψ is the wire guide +41. +61 is the inclination angle of the wire (υ) with respect to the axis.

The basic concept of the present invention will be explained based on FIG.

The wire tlJ passes through the wire guides (2; and (3)) and reaches the relaxation wire guide (6). At this time, it has an inclination of θ with respect to the axis of the relaxation wire guide (61).

However, since the 2nd positioning wire guide (4) is arranged almost on the same axis as the relaxation wire guide (6), when the wire (1) reaches the positioning wire guide (4), small slope ψ and na shi.

Workpieces 1 and 5 pass through the positioning wire guide +4)
), the inclination, that is, the distortion of the wire (1), almost disappears. As a result, from the positioning wire guide (4), which is the most important section for machining accuracy, to the positioning wire guide (4) on the opposite side of the workpiece (5).
), the wire 11+ can have an almost perfectly straight shape.

Figure 2 shows the wire (υ thickness and wire guide +41. +
61 is an explanatory diagram showing the inside diameter fathom more clearly. As shown in the figure, in reality, the inner diameter of the positioning wire guide (4) and the relaxation wire guide (61) is larger than the outer diameter of the wire (1)9. For example, in the case of the relaxation wire guide (6), There is a gap of Δy.

As is clear from the above-mentioned nine basic concepts, even if the relaxation wire guide (6) and the positioning wire guide (4) are arranged completely on the same axis, the pressure wire guide (3) may be disposed on the same axis as the positioning wire guide (4). By arranging the shaft center with its axis shifted to the opposite side, the above-mentioned distortion alleviation effect can be obtained more effectively.

Further, the distance l between the positioning wire guide (4) and the relaxation wire guide (61) is preferably as long as possible, but it is sufficient that it is at least about 10 times the diameter d of the wire (1).

In the above embodiment, there are four sets of wire guides (2).

+31, +41, (61 was explained above, but by supplying power to the relaxation wire guide (61), the wire guide (2) can be omitted, and three sets of wire guides +31, +41, (61) can be used. Furthermore, only one positioning wire guide (4) may be used in two pieces with the workpiece (5) sandwiched therebetween, and the other wire guides may be used in pairs.

〔Effect of the invention〕

As described above, according to the present invention, a pressing wire guide for pressing a wire in a predetermined direction is provided between the pressing wire guide and a workpiece, and the position of the wire with respect to the workpiece is determined. Since the positioning wire guide and the relaxation wire guide are provided between the pressing wire guide and the positioning wire guide to alleviate the distortion caused by the suppression of the wire, the distortion caused by the suppression of the wire is alleviated. This has the effect of improving machining accuracy.

[Brief explanation of drawings]

Fig. 1 is a configuration diagram showing the main parts of a wire-cut electric discharge machine according to an embodiment of the present invention, Fig. 2 is an explanatory diagram showing part A in Fig. 1 enlarged, and Fig. 3 is a conventional wire-cut electric discharge machine. FIG. 1 is a configuration diagram showing main parts of an electric discharge machine. In the figures, (1) is a wire, (3) is a pressing wire guide, (4) is a positioning wire guide, (5) is a workpiece, and (61 is a relaxation wire guide. The same reference numerals indicate the same or equivalent parts.

Claims (3)

[Claims] (1) In a wire-cut electrical discharge machine that crosses a workpiece and a wire and processes the workpiece by utilizing the electrical discharge phenomenon between the two, a pressing wire guide that presses the wire in a predetermined direction; a positioning wire guide provided between the press wire guide and the workpiece, and determining the position of the wire with respect to the workpiece; and a positioning wire guide provided between the pressing wire guide and the positioning wire guide, the A wire-cut electric discharge machine characterized by being equipped with a relaxation wire guide that relieves distortion caused by pressing the wire. (2) The wire according to claim 1, wherein both the positioning wire guide and the relaxation wire guide are formed in a ring shape, and the relaxation wire guide is arranged substantially coaxially with the positioning wire guide. Cut electrical discharge machine. (3) A patent in which the relaxation wire guide is arranged with its axis shifted from the positioning wire guide to the side opposite to the pressing wire guide by the difference between the inner diameter of the relaxation wire guide and the outer diameter of the wire. A wire-cut electric discharge machine according to claim 2.