JPH012827A - Electrical discharge machining method using running wire electrodes - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an electric discharge machining method using a running wire electrode.

<Prior art> The electrical discharge machining method using a running wire electrode is described, for example, in the 9th edition of the 1986 Kansai Region Regular Academic Lecture Collection of the Japan Society of Precision Machinery Engineers.
It is disclosed in the section ``Discharge application U j of the bottomed hole to the running wire electrode'' on pages 7 to 98.

The electrical discharge machining disclosed in this document will be described with reference to FIGS. 7 and 8. The wire (electrode) 20 passes from the bobbin 21 through the tension control structure (not shown), then slides through the tip of the electrode support guide (wire guide) 22, and then passes through the pinch [1-ra (not shown)]. Pass through bobbin 21A
1. : During this time, the part of the wire 20 in contact with the electrode support guide 22 releases 1G between it and the workpiece 23.
and perform processing. In addition, in the figure, 26 is the addition liquid 27.
28 is a control machining source, 2 is a lever mechanism for controlling the feed of the electrode support guide 22, and 30 is a machining fluid circulation system.

Since the electrode supporting guide 22 is oriented in the same direction as the moving direction thereof, four sections (grooves) 24 with a groove width W equal to the culm d of the wire 20 are machined in the workpiece 23. become.

<Problems to be Solved by the Invention> However, in the electric discharge machining method described above, since the electrode support guide 22 is oriented in the same direction as the direction of movement thereof,
If the groove width W of the fourth part 24 is larger than the wire line IYd, the machining cannot be performed by one movement of the electrode support guide 22.

191 For example, as shown in FIG.
- If it is shaped like L, electrode support guide 2
2 in the direction that crosses the feed direction? There was a problem that the lowering movement had to be avoided (see the arrow in the figure), which required a large number of machining steps and a long machining time.

Therefore, the object of the present invention is to reduce the number of man-hours required for machining a groove, which has a groove width smaller than the wire diameter of the life electrode, in view of the problem Jj1 in the conventional technology described above. C. It is an object of the present invention to provide a tIl lightning processing method that uses a running wire electrode that can be easily processed.

<Means for Solving the Problems> The present invention aims to solve the problems in the conventional techniques described above, by running the wire electrode along the guide groove of a flat wire guide. In the electric discharge machining method for grooving a crop by moving it relative to the workpiece, the wire guide is tilted at a predetermined angle with respect to the direction of movement. The gist of the structure is to do so.

<Function> According to the first stage described above, by tilting the wire guide at a predetermined angle with respect to the direction of movement, the wire guide is guided by the guide groove of the wire guide and acts on the workpiece. Since the projected area of the lie 1/゛ city pole is increased in the width direction, in this state - [When performing electrical discharge machining on the crop,
J: A processed groove with a groove width larger than the wire diameter of the Y-V electrode is formed in the L crop.

<Embodiment> An embodiment of the present invention will be described below with reference to FIGS. 1 to 6. In Fig. 1, which shows the inspector of electric discharge cutting, an angle indexing attachment 2 is attached to the tip of the main shaft 1 of the NG electric discharge cutting machine (not shown 18). It is installed in a machining head for NC electric discharge machining, and is moved in the X-axis direction, Y-axis direction, and Z-axis direction.The machining head also has one axis 1 with its axis C The center is equipped with a corner indexing function that allows it to rotate at any desired angle.

Wire guide 4 is located on the bottom surface of attachment 2's pace 3.
are fixed in a hanging manner on the same axis. The wire guide 4 is
A guide groove 6 is formed on the outer edge of the flat plate and has an arcuate cross section with a radius r for guiding the wire electrode (hereinafter also referred to as wire) 5 (second guide groove 6). (see figure and figure 3) 1. In addition, Soi 1 A Guide 4
is made of a self-lubricating material, such as nylon resin, so that the wire 5 can be guided smoothly. In addition, the guide groove 6 of the wire guide 4 is
It is approximately equal to half the wire diameter d of the lie 1a 5.

A support frame 7 is attached to the base 3 of the attachment 2.
A wire feeding mechanism 8 is provided via.

The width feeding mechanism 8 is for feeding the wire 5 to the lie A1 guide 4 and winding up the used wire 5 guided by the guide 4. A pulley 9, a vertical direction conversion pulley 10 and a horizontal direction conversion pulley 11 that change the feeding direction of the wire 5 supplied from the pulley 9, and guide the wire 5 from the horizontal direction conversion pulley 11 to the wire guide 4. a tensioner 12 that controls the tension of the wire 5, a tensioner 13 that controls the tension of the wire 5 guided in a V-shape along the guide groove 6 of the wire guide 4 together with the tension job 12; It consists of a horizontal conversion pulley 14 and a vertical conversion pulley 15 that change the feeding direction of the wire 5, and a take-up pulley 16 that winds up the wire 75 from the vertical conversion pulley 15. At the same time, the wire 5 passes from the wire supply pulley 9 to the redirection pulley 10.11 and then to the tensioner 12.
through the wire guide 4, and the wire guide 4
After being guided by the guide groove 6 of the
From there, it passes through diversion pulleys 14 and 15 and is wound onto a take-up pulley 16. Note that an electric horn is supplied to the wire I75 through the wire supply pulley 9.

Next, details of the wire guide 4 will be described with reference to FIGS. 2 and 3. The wire guide 4 is configured to guide the wire 5 in a substantially V-shape within a height H range.
It is formed into an inverted isosceles triangle shape having an apex angle φ. The top (lower end) of the wire guide 4 is chamfered with a radius R of six. Also, the thickness of the wire guide 4 and the wire diameter d of the wire 5 are
is set so that the relationship t<d holds. Note that the base (upper part) of the wire guide 4 has a parallel width B.

The electric discharge machine described above has a wire guide 4
Grooving is performed on the workpiece 17 by moving the wire guide 4 relative to the crop 17 while the wire 75 is guided along the guide groove 6 of the workpiece 17.

However, when the angle index of the main @1 is 0° and the wire guide 4 is oriented in the same direction as the traveling direction (X-axis direction), the line of the wire 5? Only a machined groove 18 having a groove width W equal to Yd was obtained (see FIG. 3).

Therefore, when cutting the machining groove 18 with a groove width W1 larger than the wire diameter d of the wire 5, the machining head angle indexing function is used to align the single axis 1 with the In contrast, the wire guide 4 is rotated at a rotation angle of 0, and the wire guide 4 is tilted at an inclination angle θ with respect to the traveling direction (fourth
(See figures 6 to 6). Then, the projected area of the wire 5 that acts on the workpiece 17 is increased in the width direction, so by moving the wire guide 4 in this state, five people will be able to touch the workpiece 17 with less than the wire diameter d of the wire 5. A processed groove 18 having an iM width W1 is formed (see FIGS. 4 and 6).

Therefore, the inclination angle θ of the wire guide 4, ■ machining depth il of the wire guide 4 with respect to the crop 17: '1111g),
By appropriately setting the amount of movement, it is possible to form a machined groove 18 of an arbitrary shape on the workpiece 17.

In this example, since the wire guide 4 has an inverted isosceles triangular shape, the processed groove 18 is processed into a groove shape with a tapered cross section.

Here, the taper angle Φ when the wire guide 4 of this example is inclined at an angle θ can be calculated by the following equation.

Φ−2tan” ((tanφ/2)−sinθ) Also,
The machining depth is I'r, and the width of the wire guide 4 at this time is b.
Then, the maximum rotation angle θrTl of wide t/fl id 4
aX is approximated 171 using the following equation.

(d-t) θmax#tan-1□ 2 (b+ (d/2>) Therefore, in this state, if the wire guide 4 is moved in the X-axis direction and electrical discharge machining is performed, the cross section of the machined groove 18 will be tapered. It will be formed in a V-shape with an angle Φ.

The electrical discharge machining method as in this example involves machining a groove 18 with a tapered cross section with a slight angle and a groove bottom width of about 1#1I11, for example, a rib groove for forming ribs in each scale forming metal. It has a beneficial effect when you do it.

In addition, if a rectangular wire guide 4 is used,
It is possible to form a machining groove 18 in the shape of a .
There is no problem even if the wire guide 4 has a semicircular tip.

In addition, for example, as shown in FIG.
In case A, there is a recess 4a in the guide part, so
There is a part of the wire 5 that separates from the running route, making it difficult to guide the wire 5 reliably, but since the wire guide 41 of this example is formed in an inverted isosceles triangular shape, It is possible to reliably guide the travel 1J along the guide groove 6 of the guide 4.

Further, by making the width of the wire guide 4 as small as possible, the maximum rotation angle θmax can be made large, and the groove width W1 of the processed groove 18 can be processed to be more compact.

<Effects of the Invention> That is, according to the present invention, the wire guide is tilted at a predetermined angle with respect to the direction of movement, so that the wire guide is guided in its travel by the guide groove of the wire guide 7 and attached to the workpiece. Since the projected area of the reliable wire electrode is increased in the width direction, by performing electrical discharge machining on the workpiece in this state, a machined groove with a width more convenient than the diameter of the wire electrode can be formed on the workpiece. Therefore, it is possible to machine a groove with a width larger than the F11 diameter of the Y-7, with less machining man-hours compared to the conventional method, and with ease. Figure 1 is a side view of the main parts of the two aircraft, Figure 2 is a side view of the wire guide, and Figure 3 is a side view of the wire guide. 4 is a front view of the wire guide in a tilted state, FIG. Figures 7A and 10 show conventional examples, in which Figure 7 is a schematic diagram of a machine for discharging a bottomed hole using a running wire electrode, Figure 8 is a front sectional view of the wire guide, and Figure 9 The figure is an explanatory diagram for machining a tapered groove, and FIG. 10 is a side view showing a wire guide with a recessed portion in the middle.

4... Wire guide 5... Wire electrode (wire) 6... Guide groove 17... 1 crop 18... Machining groove Wl... Groove width (1... Wire diameter Applicant Toyota 71st member of Jidosha Co., Ltd.
Patent attorney Oka [■Hidehiko (2 others)・i ＼↑

Claims (2)

[Claims] (1) In the electric discharge machining method for machining grooves on a workpiece by moving a wire electrode along the guide groove of a flat wire guide and moving the wire guide relative to the workpiece. . An electrical discharge machining method, characterized in that the wire guide is inclined at a predetermined angle with respect to its moving direction. (2) The electric discharge machining method according to claim (1), wherein the guide groove of the wire guide is formed in a shape capable of guiding the wire electrode in a substantially V-shape.