JP2000084742A - Wire-cut electric discharge machining device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To cool a wire electrode sufficiently by providing a working-fluid rectifier inserted into an opening part of a working groove, so as to face to an electric discharge machining part for executing electric discharge machining between a part of the wire electrode and a work piece. SOLUTION: When working fluid 24 is flowed from the upper and lower sides of a work piece 18 along a wire electrode 11a, the interval 26a existing between a working-fluid rectifier 26 and the work piece 18 becomes narrower than an electric discharge machining interval existing between the wire electrode 1a and the work piece 18 as much as a board-shaped area, therefore, the flow resistance of the working fluid 24 flowing into the electric discharge machining interval becomes smaller than the flow resistance of the working fluid 24 flowing into the interval 26a. As a result, after the working fluid 24 is supplied up to an electric discharge machining center part A of an electric discharge machining part 11b of the wire electrode 11a, the working fluid 24 flows toward an opening part, therefore the wire electrode 11a is cooled sufficiently. An average pulse current value to be set in the range where thermal breaking of the wire electrode 11a does not occur can be set high, to thereby enable to increase the machining speed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire electric discharge machine.

[0002]

2. Description of the Related Art Wire-cut electric discharge machines are capable of fine cutting that cannot be performed by other machine tools. Has been composed. FIG. 13 is a perspective view showing an electric discharge machining part of a conventional wire electric discharge machining apparatus disclosed in, for example, Japanese Patent Publication No. 63-28732.

In FIG. 13, for example, a diameter of 0.25 mm
While the machining fluid 5 is being sprayed from the upper machining fluid supply nozzle 3 and the lower machining fluid supply nozzle 4 into the electric discharge machining gap existing between the wire electrode 1 and the workpiece 2, the upper communication electrons and the lower communication When a negative voltage is applied to the electrons and the wire electrode 1 is negatively charged, and when a positive voltage is applied to the workpiece 2, the potential difference between the wire electrode 1 and the workpiece 2 causes , Causing discharge. When discharging from the wire electrode 1 to the workpiece 2, a working fluid 5 is sprayed on the wire electrode 1 in order to prevent the temperature of the wire electrode 1 from rising.

[0004] At this time, in the electric discharge machining gap existing between the wire electrode 1 and the workpiece 2, the workpiece 2 is melted and scattered by thermal energy at the time of discharge accompanied by heat of vaporization of the machining fluid 5. A processing groove 6 is formed in the workpiece 2 to form an opening 6a having a width of, for example, 0.35 mm.

[0005]

Since the conventional wire cut electric discharge machine is constructed as described above, when the machining fluid 5 flows along the wire electrode 1 from above and below the workpiece 2, the wire is cut off. Since the electric discharge machining gap existing between the electrode 1 and the workpiece 2 is as small as 0.05 mm and the flow resistance of the machining fluid 5 flowing through the electric discharge machining gap is inversely proportional to the square of the size of the electric discharge machining gap. , The flow resistance increases. On the other hand, at the opening 13a having a width of 0.35 mm, the flow resistance of the working liquid 14 is small.

For this reason, as shown in FIG.
The machining fluid 5 flowing into the inside is not supplied to the electric discharge machining center A of the wire electrode 1 but flows toward the opening 6a as shown by the arrow B, and as a result, the wire electrode 1 cannot be sufficiently cooled. There was a problem. FIG. 14 is the same as FIG.
FIG. 4 is a cross-sectional view taken along line XIV-XIV of FIG.

In order to prevent the machining fluid 5 from leaking from the machining groove 6, the opening 6a of the machining groove 6 is closed with a machining fluid rectifier 7 as shown in FIG. Is to supply enough. However, even if the opening 6a of the machining groove 6 is closed, the flow resistance of the central portion A of the electric discharge machining of the wire electrode 1 is still large, so the machining fluid 5 flowing into the machining groove 6 is shown in FIG. There is a problem that the wire electrode 1 is bent toward the opening 6a as shown by the arrow B and is not sufficiently supplied to the central portion A of the electric discharge machining of the wire electrode 1.

Furthermore, when the wire electrode 1 cannot be sufficiently cooled, there is a problem that the breaking current limit, that is, the machining current value determined at a place where the wire electrode 1 is not thermally broken, becomes low. That is, since the processing speed is proportional to the processing current value, there is a problem that when the processing current value flowing through the wire electrode 1 decreases, the processing speed decreases.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is intended that a machining fluid flowing into a machining groove of a workpiece is discharged to a central portion of a wire electrode located at the center of the workpiece. An object of the present invention is to provide a wire electric discharge machine which can supply and sufficiently cool a wire electrode. It is another object of the present invention to provide a wire electric discharge machine capable of preventing a wire electrode from being thermally broken, that is, increasing a machining current value flowing through the wire electrode by increasing a disconnection limit and increasing a machining speed.

[0010]

In a wire electric discharge machining apparatus according to the present invention, a discharge between a wire electrode and a workpiece is performed while supplying a machining fluid to a discharge machining gap between the wire electrode and the workpiece. In a wire-cut electric discharge machine that generates machining grooves in the workpiece by generating electric waves, the wire electrode is inserted into the opening of the machining groove so as to face the electric discharge machining section that performs electric discharge machining between the wire electrodes and the workpiece. It is provided with a provided plate-shaped machining fluid straightening body.

The machining fluid rectifier has at least one circulation port for circulating the machining fluid at a position facing the center of the electric discharge machining of the wire electrode.

The flow opening of the working fluid straightener is formed by vertically separating the working fluid straightener.

[0013] Further, a support member is fixed to at least one end of the working fluid straightening body.

[0014] Further, while supplying machining fluid from the upper machining fluid supply nozzle and the lower machining fluid supply nozzle to the electric discharge machining gap between the workpiece and the wire electrode moving with respect to the workpiece, the wire electrode and the workpiece are connected to each other. In a wire-cut electric discharge machining device that forms a machining groove in a workpiece by generating an electric discharge between the wire holders, the machining grooves are movably inserted through the respective wire holders and the respective wire holders in conjunction with both nozzles. The wire is introduced into the opening, and moves continuously to the wire electrode, and follows the wire electrode. The wire acts as a machining fluid rectifier.

Each of the wire holders is disposed on both nozzles or a mounting base of both nozzles.

Further, each wire holder is rotatable with respect to the axis of the wire electrode.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is an explanatory view showing an outline of a wire cut electric discharge machine according to Embodiment 1 of the present invention, FIG. 2 is a perspective view showing an electric discharge machine of the wire cut electric discharge machine of FIG. 1, and FIG. Arrow III -III
FIG. 4 shows a jet of the machining fluid in a cross-sectional view taken along the line.
FIG. 3A is a cross-sectional view taken along line IIIa-IIIa in FIG. 3.

In FIG. 1, FIG. 2, FIG. 3, and FIG.
The wire-cut electric discharge machine has, for example, a diameter of 0.25 mm.
Supply bobbin 12 for sending out wire 11 made of brass
And a brake roller 13 connected to the electromagnetic brake 13a and applying a predetermined tension to the wire 11, and idle rollers 14a, 14b and 1 for changing the traveling direction of the wire 11.
4c and a wire delivery roller 15 between which the wire 11 is stretched. The wire 11 extends vertically between the idle rollers 14 b and 14 c and moves with respect to the workpiece 18.

An upper working fluid supply nozzle 16 and a lower working fluid supply nozzle 17 are respectively arranged on the vertically extending portion of the wire 11 so as to face the workpiece 18. The inside of the nozzle 16 and the inside of the lower working liquid supply nozzle 17 are respectively penetrated. A processing liquid is supplied to the upper processing liquid supply nozzle 16 and the lower processing liquid supply nozzle 17 from a processing liquid pump 19. In the upper processing liquid supply nozzle 16 and the lower processing liquid supply nozzle 17, an upper conductive member 20 and a lower conductive member 21 that are in conductive contact with the wire 11 are provided, respectively.

Incidentally, the wire 11 which is in conductive contact with the upper conducting member 20 and the lower conducting member 21 and extends between the two conducting members 20, 21 is referred to as a wire electrode 11a. Further, of the wire electrode 11a, a portion where electric discharge machining is performed between the wire electrode 11a and the work 18 is referred to as an electric discharge machining portion 11b, and faces a machining groove 23 formed in the work 18 by electric discharge machining. The upper and lower communication terminals 20 and 21 are electrically connected to a pulse power supply unit 22 as a processing power supply. The upper electrode 20 and the lower electrode 2 are connected to the wire electrode 11a.
1 and maintains an electric discharge machining gap of, for example, 0.05 mm between the workpiece and the workpiece 18.

A plate-shaped machining fluid rectifier 26 having substantially the same width and height as the opening 23a of the machining groove 23 and made of a non-conductive material, such as ceramic or rubber, faces the electric discharge machining portion 11b. It is inserted into the opening 23 a of the groove 23.

Next, the operation will be described. While the machining fluid 24 is sprayed from the upper machining fluid supply nozzle 16 and the lower machining fluid supply nozzle 17 into the electric discharge machining gap where the wire electrode 11a and the workpiece 18 are opposed to each other, the upper and lower electronics 20 and 20 are jetted. When a negative voltage is applied to the workpiece 21 and the wire electrode 11a is negatively charged, and when a positive voltage is applied to the workpiece 18, the wire electrode 11a and the workpiece 18 are charged.
A discharge is generated by the potential difference generated between.

When discharging from the wire electrode 11a to the workpiece 18, in order to prevent the temperature of the wire electrode 11a from rising,
The working liquid 24 is sprayed on the wire electrode 11a. At this time, in the electric discharge machining gap existing between the wire electrode 11a and the workpiece 18, the workpiece 18 is melted and scattered by thermal energy at the time of discharge accompanied by heat of vaporization of the machining fluid 24.

The relative movement between the wire electrode 11a and the workpiece 18 for continuously performing the discharge is usually XY.
This is performed by controlling the position of a cross table (not shown). The relative movement between the upper working fluid supply nozzle 16 and the workpiece 18 is maintained at a predetermined value by moving the upper working fluid supply nozzle 16 up and down by Z-axis control in accordance with irregularities of the workpiece 18 or the like. It is. In this way,
A processing groove 23 is formed in the workpiece 18, for example, 0.35
An opening 23a having a width of mm is formed.

In the wire electric discharge machine configured as described above, when the machining fluid 24 flows from above and below the workpiece 18 along the wire electrode 11a, the machining fluid rectifier 26 and the workpiece 18 Is smaller than the electric discharge machining gap between the wire electrode 11a and the workpiece 18 by the plate-shaped area, so that the flow resistance of the machining fluid 24 flowing into the electric discharge machining gap is reduced. Is smaller than the flow resistance of the machining liquid 24 flowing into the gap 26a.

As a result, as shown by the arrow C in FIG. 3, the machining fluid 24 is supplied to the electric discharge machining center A of the electric discharge machining portion 11b of the wire electrode 11a and then flows toward the opening 13a. The electrode 11a can be sufficiently cooled. In addition, since the wire electrode 11a can be sufficiently cooled, a processing current value determined at a disconnection limit, that is, a place where the wire electrode 11a is not thermally disconnected, can be increased.
Processing speed can be increased.

The working fluid straightening body 26 may be linear or rod-shaped, but in consideration of the function as the working fluid straightening body,
A plate shape is preferred.

FIGS. 4 (b) and 4 (c) show the working fluid straightening body 26 in order to facilitate attachment or detachment.
As shown in (1), a support plate 26b made of a non-conductive material, such as ceramic or rubber, may be fixed to one or both ends of the working fluid rectifier 26, and the same operation and effect as described above can be obtained. The support plate 26b may be fixed to the working fluid straightener 26 or may be formed integrally with the working fluid straightener 26.

Alternatively, the working fluid rectifier 26 may be formed of a conductor, and may be inserted into the opening 23a so as not to generate a discharge between the wire electrode 11a and the opening 23a.

Embodiment 2 FIG. FIG. 5 is a perspective view showing an electric discharge machining part of a wire cut electric discharge machine according to a second embodiment of the present invention, and FIG. 6 is a sectional view taken along line VI-VI of FIG. FIG. 7A is a view taken in the direction of arrow VI in FIG.
It is sectional drawing seen from the Ia-VIIa line. An explanatory view showing the outline of the wire electric discharge machine is the same as that of FIG. Of the reference numerals shown in FIGS. 5, 6, and 7 (a), the same reference numerals as those shown in FIGS. 2, 3, and 4 denote the same or equivalent parts, and a description thereof will be omitted.

5A, 5B, 6A, and 7A, a processing groove 23 made of a non-conductive material such as ceramic or rubber is used.
The plate-shaped machining fluid rectifier 27 having substantially the same width and height as the opening 23a of the electric discharge machining portion 11b of the wire electrode 11a.
And is inserted into the opening 23a of the processing groove 23. Since the machining fluid rectifier 27 has a flow port 27a formed of a plurality of holes through which the machining fluid 24 flows at a position facing the electric discharge machining center A of the wire electrode 11a, the machining fluid 24
Can easily flow into the distribution port 27a.

In the wire electric discharge machine configured as described above, when the machining fluid 24 flows from above and below the workpiece 18 along the wire electrode 11a, the gap between the wire electrode 11a and the workpiece 18 is increased. Is smaller than the flow resistance of the machining fluid 24 flowing into the gap 27b existing between the machining fluid rectifier 27 and the workpiece 18. As shown by arrow D in FIG. 6, the machining fluid 24 is supplied to the electric discharge machining center A of the wire electrode 11a, and then flows toward the opening 23a. Further, since the working fluid 24 flows into the flow port 27a having a low flow resistance, the working fluid 24
a, it can be easily supplied to the electric discharge machining center A.

As a result, the wire electrode 11a can be sufficiently cooled. Further, since the wire electrode 11a can be sufficiently cooled, the disconnection limit, that is, the wire electrode 1
Since the processing current value determined at 1a where heat disconnection does not occur can be increased, the processing speed can be increased.

In order to facilitate attachment or detachment of the working fluid straightening body 27, as shown in FIGS. 7 (b) and 7 (c), one or both ends of the working fluid straightening body 27 are attached. Alternatively, a support plate 27c made of a non-conductive material such as ceramic or rubber may be fixed.

As shown in FIG. 7 (d), the wire electrode 11a has a long and narrow hole through which the machining fluid 24 flows through the center of the machining fluid rectifier 27, as shown in FIG. It has the formed distribution port 27d, and the opening 2 of the machining groove 23
It may have substantially the same width and height as 3a, with the same operational effects as described above. Note that the distribution port 27d may be formed by a plurality of elongated holes.

As shown in FIG. 7 (e), the machining fluid 24 flows through one or both side faces of the machining fluid rectifier 27 at a position facing the electric discharge machining center A of the wire electrode 11a. It may have a flow port 27e formed by a long and thin hole, and have substantially the same width and height as the opening 23a of the processing groove 23.

At the position facing the electric discharge machining center A of the wire electrode 11a, as shown in FIG. 7 (f), the machining fluid is formed so as to have substantially the same width and height as the opening 23a of the machining groove 23. The flow straightening body 27 may be separated and inserted vertically, and may have a flow opening 27f at the center thereof, which has the same function and effect as described above, and further facilitates attachment or detachment to the opening 23a. .

7 (d), 7 (e), 7 (f).
As shown in FIGS. 7 (b) and 7 (c), in order to facilitate attachment or detachment of the working fluid straightening body 27 shown in FIG. The plate 27c may be fixed.

Embodiment 3 FIG. 8 is an explanatory view showing an outline of a wire cut electric discharge machine according to a third embodiment of the present invention, FIG. 9 is a perspective view showing an electric discharge machine of the wire cut electric discharge machine of FIG. 8, and FIG. A cross-sectional view as viewed from the arrow XX shows the jet of the machining liquid. 8, 9, and 1
Of the reference numerals denoted by 0, those denoted by the same reference numerals as those shown in FIGS. 1, 2 and 3 indicate the same or equivalent parts, and a description thereof will be omitted.

8, 9 and 10, the upper working fluid supply nozzle 28 is connected at its lower end to a rotating nozzle 28a via a bearing 29, and the rotating nozzle 28a is connected to the upper working fluid supplying nozzle 28. Rotate about an axis. The wire holder 30 made of a non-conductive material disposed on the rotary nozzle 28a has a hole 30a through which the wire 11 after the electric discharge machining can be movably inserted. The nozzle rotation driving device 31 is
The rotation nozzle 28a is moved by a signal from the numerical controller 32 to control the rotation angle of the wire holder 30.

The lower working fluid supply nozzle 33 has a rotating nozzle 33 a connected to the upper end thereof via a bearing 29, and the rotating nozzle 33 a rotates with respect to the axis of the lower working fluid supply nozzle 33. The wire holder 34, which is disposed on the rotating nozzle 33a and is made of a non-conductive material and faces the wire holder 30, has a hole 34a through which the wire 11 after the electric discharge machining can be movably inserted. The nozzle rotation driving device 35 controls the rotation angle of the wire holder 34 by moving the rotation nozzle 33 a according to a signal from the numerical control device 32.

The wire 11 is supplied from the supply bobbin 12 via a brake roller 13 to idle rollers 14a, 14a.
The running direction is changed at b, 14c, 14d, 14e, 14f, and 14g, and the running direction is extended over the wire delivery roller 15. The wire 11 extends vertically between the idle rollers 14b and 14c, moves substantially at a right angle to the workpiece 18, and is conductively connected to the upper and lower communication terminals 20 and 21 to form a wire electrode 11a. Works. Wire electrode 11a
Is supported by the upper conductive member 20 and the lower conductive member 21, and an electric discharge machining gap of, for example, 0.05 mm is maintained between the workpiece 18.

The direction of travel of the wire 11 moving continuously to the wire electrode 11a is changed by the idle rollers 14c and 14d, and extends vertically between the idle rollers 14d and 14e. 30a, 34
a movably inserted into the opening 23a of the machining groove 23, and follows the wire electrode 11a with the progress of the electric discharge machining while maintaining a gap of, for example, 0.05 mm between the workpiece 18 and the workpiece 18. .

Next, the operation will be described. While the machining fluid 24 is sprayed from the upper machining fluid supply nozzle 28 and the lower machining fluid supply nozzle 33 into the electric discharge machining gap existing between the wire electrode 11 a and the workpiece 18, the upper and lower communication electrodes 10 and 33 are discharged. When the wire electrode 11a is negatively charged by applying a negative voltage to the workpiece electrode 11, and when a positive voltage is applied to the workpiece 18, the wire electrode 11a and the workpiece 18 are charged.
A discharge is generated by the potential difference generated between. At this time, in the electric discharge machining gap existing between the wire electrode 11a and the workpiece 18, the workpiece 18 is melted and scattered by thermal energy at the time of discharge accompanied by heat of vaporization of the machining fluid 24.

The relative movement between the wire electrode 11a and the workpiece 18 for maintaining the gap between the wire electrode 11a and the workpiece 18 at a constant value and continuously performing the discharge is represented by X This is performed by controlling the position of a -Y cross table (not shown). The relative movement between the upper working fluid supply nozzle 28 and the workpiece 18 is controlled by the Z-axis control according to the unevenness of the workpiece 18 and the like.
8 is maintained at a predetermined value by moving up and down. In this manner, the discharge is repeated, and the position of the XY cross table is controlled, so that the processing groove 23 is formed in the workpiece 18 as shown in FIG. 9, and the opening having a width of, for example, 0.35 mm is formed. A portion 23a is formed.

Further, the wire electrode 11 after the electric discharge machining is
The running direction is changed by the idle rollers 14c and 14d,
Extending vertically between the idle rollers 14d and 14e,
It is movably inserted into the holes 30a and 34a of the wire holders 30 and 34, is introduced into the opening 23a of the processing groove 23, and discharges while maintaining a gap of, for example, 0.05 mm between the workpiece 18 and the electric discharge. As the processing progresses, the wire electrode 11
Follow a. In response to a complicated machining shape of the workpiece 18, the rotation nozzles 28 a and 33 are driven by the nozzle rotation driving devices 31 and 35 by a signal from the numerical controller 32.
The wire 11 can follow the wire electrode 11a by controlling the rotation angle of the wire holders 30 and 34 by moving the wire a.

In the wire electric discharge machine configured as described above, the wire electrode 11 after the electric discharge machining is always introduced into the opening 23a of the machining groove 23 even when the workpiece 18 has a complicated machining shape. Therefore, a gap of, for example, 0.05 mm can be maintained between the workpiece 18 and the wire 11, and the wire 11 functions as a machining fluid rectifier. For this reason, the flow resistance of the working fluid 24 flowing into the gap existing between the wire 11 and the workpiece 18 increases, so that the working fluid 24
Flows from above and below the workpiece 18 along the wire electrode 11a, as shown by an arrow E in FIG.
4 is supplied to the electric discharge machining center A of the wire electrode 11a, and then flows toward the opening 23a.

As a result, the wire electrode 11a can be sufficiently cooled. Further, since the wire electrode 11a can be sufficiently cooled, the disconnection limit, that is, the wire electrode 1
Since the processing current value determined at 1a where heat disconnection does not occur can be increased, the processing speed can be increased.

As shown in FIG. 11, the wire 11 before the electric discharge machining may function as a machining fluid rectifier, and the same operation and effect as described above can be obtained.

Further, the wire holders 30 and 34 may be arranged on a mounting base (not shown) to which both the working fluid supply nozzles 28 and 33 are mounted, and the same operation and effect as described above can be obtained.

Embodiment 4 FIG. FIG. 12 is an explanatory diagram showing an outline of a wire cut electric discharge machine according to a fourth embodiment of the present invention. 12 that are the same as those shown in FIGS. 1 and 8 indicate the same or equivalent products.
The description is omitted. As shown in FIG. 12, a wire holder 20 having a hole 20 a through which the wire 11 after the electric discharge machining can be movably inserted is disposed in the upper machining liquid supply nozzle 6, and the electric discharge machining is performed at a position opposed to the wire holder 20. A wire holder 24 having a hole 20b through which the later wire 11 can be movably inserted is provided in the lower processing liquid supply nozzle 7, and is applicable when the cutting direction of the processing groove 23 is only one direction.

In the wire electric discharge machine configured as described above, the wire 11 after the electric discharge machining is always introduced into the opening 23a of the machining groove 23.
8, a gap of, for example, 0.05 mm can be maintained, and the wire electrode 11 functions as a machining fluid rectifier. Therefore, the flow resistance of the working fluid 24 flowing into the gap existing between the wire electrode 11 and the workpiece 18 increases,
The processing liquid 24 is applied along the wire electrode 11a to
When the inflow from above and below occurs, as shown by arrow E in FIG.
, And then flows toward the opening 23a.

As a result, the wire electrode 11a can be sufficiently cooled. Further, since the wire electrode 11a can be sufficiently cooled, the disconnection limit, that is, the wire electrode 1
Since the processing current value determined at 1a where heat disconnection does not occur can be increased, the processing speed can be increased.

[0054]

Since the present invention is configured as described above, it has the following effects. ADVANTAGE OF THE INVENTION According to the wire electric discharge machining apparatus which concerns on this invention, the machining fluid rectifier inserted in the opening part of the machining groove facing the electric discharge machining part which performs electric discharge machining with a workpiece among wire electrodes Since the flow resistance of the machining fluid flowing into the gap existing between the machining fluid rectifier and the workpiece increases, the machining fluid flowing from above and below the workpiece causes electric discharge machining of the wire electrode. After being supplied to the central portion, it is possible to flow toward the opening, and the wire electrode can be sufficiently cooled. In addition, since the wire electrode can be sufficiently cooled, a processing current value determined at a disconnection limit, that is, a position where the wire electrode is not thermally disconnected, can be increased, so that a processing speed can be increased.

Further, by providing at least one circulation port for circulating the machining fluid at a position facing the central portion of the electric discharge machining of the wire electrode, the machining fluid flows into the circulation port having a low flow resistance. Since the machining fluid flowing from above and below the object can be easily supplied to the central part of the electric discharge machining of the wire electrode,
The wire electrode can be sufficiently cooled.

Further, since the flow opening of the working fluid straightening body is formed by vertically separating the working fluid straightening body, the working fluid can flow into the flow opening having a low flow resistance. Installation and removal becomes easier.

Further, since the support member is fixed to at least one end of the working fluid straightener, the attachment or detachment of the working fluid straightener becomes easy.

Further, each of the wire holders, which are interlocked with the two nozzles, oppose each other, are movably inserted into the respective wire holders, introduced into the openings of the processing grooves, continuously moved to the wire electrodes, and moved to the wire electrodes. With the following wire, the working fluid straightener is always introduced into the opening of the machining groove by using the wire as the working fluid straightener, and therefore exists between the working fluid straightener and the workpiece. The flow resistance of the machining fluid flowing into the gap increases, and the machining fluid flowing from above and below the workpiece is supplied to the center of the electric discharge machining of the wire electrode, and then can flow toward the opening, and the wire electrode Can be sufficiently cooled. In addition, since the wire electrode can be sufficiently cooled, a processing current value determined at a disconnection limit, that is, a position where the wire electrode is not thermally disconnected, can be increased, so that a processing speed can be increased.

Since each wire holder is arranged on both nozzles or the mounting base of both nozzles, the working fluid straightener is always introduced into the opening of the machining groove. The flow resistance of the machining fluid flowing into the gap existing between the workpiece and the workpiece increases, and the machining fluid flowing from above and below the workpiece is supplied to the central portion of the electric discharge machining of the wire electrode. It is possible to flow to the side, and the wire electrode can be sufficiently cooled.

Furthermore, since each wire holder is rotated with respect to the axis of the wire electrode, even when the workpiece has a complicated machining shape, the machining fluid rectifier always opens the machining groove. Flow resistance of the machining fluid flowing into the gap existing between the machining fluid rectifier and the workpiece increases, and the machining fluid flowing from above and below the workpiece causes electric discharge machining of the wire electrode. After being supplied to the central portion, it is possible to flow toward the opening, and the wire electrode can be sufficiently cooled.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing an outline of a wire electric discharge machine according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing an electric discharge machining portion of the wire electric discharge machine of FIG.

FIG. 3 is a sectional view taken along line III-III in FIG. 2;
It is explanatory drawing which shows the jet of a working fluid.

4A is a sectional view taken along line IVa-IVa of FIG. 3, FIG. 4B is a sectional view showing another example of FIG. 4A, and FIG. It is sectional drawing which shows another example of FIG.4 (b).

FIG. 5 is a perspective view showing an electric discharge machining part of a wire electric discharge machine according to a second embodiment of the present invention.

6 is a cross-sectional view taken along line VI-VI of FIG. 5, and is an explanatory view showing a jet of a machining fluid.

7A is a sectional view taken along line VIIa-VIIa of FIG. 6, FIG. 7B is a sectional view showing another example of FIG. 7A, and FIG. 7B is a cross-sectional view illustrating another example, and FIG. 7D is a cross-sectional view illustrating another example of FIG.
(E) is a sectional view showing another example of FIG. 7 (d), and (f) is a sectional view showing another example of FIG. 7 (e).

FIG. 8 is an explanatory view showing an outline of a wire cut electric discharge machine according to a third embodiment of the present invention.

FIG. 9 is a perspective view showing an electric discharge machining part of the wire cut electric discharge machining apparatus diagram of FIG. 8;

FIG. 10 is a cross-sectional view taken along line XX of FIG. 9, and is an explanatory view showing a jet of a machining fluid.

FIG. 11 is an explanatory diagram showing an outline of another wire electric discharge machine according to Embodiment 3 of the present invention.

FIG. 12 is an explanatory diagram illustrating an outline of a wire electric discharge machine according to a fourth embodiment of the present invention.

FIG. 13 is a perspective view showing an electric discharge machining section of a conventional wire cut electric discharge machining apparatus.

FIG. 14 is a cross-sectional view taken along line XIV-XIV of FIG. 13, and is an explanatory view showing a jet of a machining liquid.

FIG. 15 is a perspective view showing an electric discharge machining part of another conventional wire cut electric discharge machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Wire 11a Wire electrode 18 Workpiece 23 Processing groove 23a Opening 24 Processing liquid 26, 27 Processing liquid rectifier 27a, 27d, 27e, 27f Flow opening 26b, 27c Support member 28 Upper processing liquid supply nozzle 33 Lower processing liquid supply Nozzles 28a, 33a Rotating nozzles 30, 34 Wire holder

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Kiyoshi Samura 2-3-2 Marunouchi, Chiyoda-ku, Tokyo F-term (reference) 3C059 AA01 AB05 DA06 DC02 EE01 FA01 FA06 FB02 FB04 FB05 FB06 JA02

Claims (7)

[Claims] An electric discharge is generated between the wire electrode and the workpiece while supplying a machining fluid to an electric discharge machining gap between the wire electrode and the workpiece to form a machining groove in the workpiece. In the wire-cut electric discharge machining device, a machining fluid rectifier inserted into an opening of the machining groove is provided opposite to an electric discharge machining portion that performs electric discharge machining with a workpiece among the wire electrodes. A wire electric discharge machine. 2. The wire-cut electric discharge machining according to claim 1, wherein the machining fluid rectifier has at least one circulation port for circulating the machining fluid at a position facing the electric discharge machining center of the wire electrode. apparatus. 3. The wire-cut electric discharge machine according to claim 2, wherein the flow opening of the working fluid straightening body is formed by vertically separating the working fluid straightening body. 4. A working fluid straightening body, wherein a support member is fixed to at least one end of the working fluid straightening body.
The wire-cut electric discharge machine according to any one of the above. 5. The wire electrode and the workpiece while supplying machining fluid from an upper machining fluid supply nozzle and a lower machining fluid supply nozzle to an electric discharge machining gap between the workpiece and the wire electrode moving with respect to the workpiece. In a wire-cut electric discharge machine for generating a discharge groove between a workpiece and a processing groove to form a processing groove in the workpiece, each of the wire holders interlocking with the nozzles and facing each other, and each of the wire holders is movable. And a wire that is introduced into the opening of the machining groove, moves continuously to the wire electrode, and follows the wire electrode, and the wire acts as a machining fluid rectifier. Wire cut electric discharge machine. 6. The wire-cut electric discharge machine according to claim 5, wherein each wire holder is disposed on both nozzles or a mounting base of the two nozzles. 7. The wire electric discharge machine according to claim 5, wherein each wire holder rotates with respect to an axis of the wire electrode.