JPH0453647B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement in a machining fluid supply nozzle device for a wire cut electric discharge machining machine.

[Conventional technology]

In wire cut electrical discharge machining, it is essential to supply sufficient machining fluid into the machining gap, and for this purpose a machining fluid supply nozzle is provided.

A so-called single-flow nozzle having a nozzle diameter of about 4 mmφ to 8 mmφ is generally used as a machining fluid supply nozzle for a wire-cut electrical discharge machining device. In addition, a double nozzle is also used, which is formed into a double tube shape and has an auxiliary nozzle that opens annularly around the main nozzle.

The double nozzle is provided coaxially with the wire electrode,
It consists of a main nozzle that spouts machining fluid at high speed, and an auxiliary nozzle that has an annular opening centered around the main nozzle.During machining, the jetting angle, jetting pressure, and flow rate of machining fluid supplied from each nozzle are controlled. Processing is performed while controlling the flow rate, flow rate, etc.

However, in the conventional double nozzle, if the flow rate of the machining fluid ejected from the machining fluid supply nozzle is increased in order to ensure a sufficient supply of machining fluid into the machining gap, air entrainment phenomena may occur. arise,
Increasing the flow rate does not increase the supply of machining fluid into the machining gap, and on the contrary, the electric discharge machining becomes unstable due to the entrainment of air, and furthermore, the injected machining fluid may damage the workpiece. There was a problem in that a lot of droplets were generated at the part that touched the surface, and as a result, the device was eroded.

[Problems to be solved by the present invention]

The present invention has been made based on the above-mentioned viewpoints, and its purpose is to apply a sufficient amount of machining fluid to the machining portion of a workpiece during electric discharge machining to cause air entrainment. It is an object of the present invention to provide a machining fluid supply nozzle device for a wire-cut electrical discharge machining apparatus, which can supply machining fluid in a manner that prevents fluid from being damaged and can perform stable electrical discharge machining over a long period of time.

[Means for solving problems]

The above object is to provide a wire-cut electric discharge machining apparatus that performs electric discharge machining while applying a predetermined electric discharge pulse between a wire electrode and a workpiece and supplying machining fluid by jetting it from a machining fluid supply nozzle into the machining gap. A machining fluid injection nozzle device installed in the main nozzle, which includes a main nozzle that is coaxial with the wire electrode path and that spouts machining fluid at high speed, and at least one auxiliary auxiliary having a concentric opening centered on the main nozzle. This is achieved by attaching a large number of filaments around at least one machining fluid spout in a machining fluid supply nozzle device for a wire-cut electrical discharge machining device comprising a nozzle.

[Effect]

As described above, in a wire cut electric discharge machine equipped with a double nozzle consisting of a main nozzle and one or more auxiliary nozzles, a large number of thread-like bodies may be attached around the ejection port of at least one auxiliary nozzle. This makes it possible to envelop the injected machining fluid, prevent air from being entrained, and supply a sufficient amount of machining fluid to the machining portion of the workpiece.
Furthermore, electrical discharge machining can be performed stably over a long period of time.

〔Example〕

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

FIG. 1 is an explanatory diagram showing one embodiment of a machining fluid supply nozzle device for a wire-cut electric discharge machining apparatus according to the present invention, FIG. 2 is an enlarged perspective view of the nozzle portion thereof, and FIG. 3 is another embodiment. FIG. 4 is a top view taken along line AA in FIG. 3.

1 and 2, 1 is an upper arm of the wire-cut electric discharge machining apparatus, 2 is a nozzle device attached to the arm 1, 3 is a nozzle holder, and 4 is a nozzle consisting of a main nozzle 5 and an auxiliary nozzle 6. , 7 is a cap nut, 8 is a first machining liquid supply pipe, 9
1 is a second machining fluid supply pipe, 10 is a machining fluid supply device that supplies machining fluid at high pressure, for example, to the first machining fluid supply pipe 8, and 11 is a machining fluid supply device that supplies machining fluid to the second machining fluid supply pipe 9, for example, at a discharge flow rate. A machining fluid supply device that supplies machining fluid at a lower pressure than the main nozzle 5, 12 is a wire electrode, 13 and 14 are O-rings, 15 is an electrode guide holder for the wire electrode 12, 15a is a die-shaped electrode positioning guide, 15b 16 is a guide pulley for the wire electrode 12, 17 is a workpiece supported by a support device (not shown), 18 is an auxiliary guide;
are a large number of filamentous bodies attached around the ejection port of the auxiliary nozzle 6.

It should be noted that the nozzle device 2 normally has a lower arm that is arranged below the workpiece 17 and facing each other via the workpiece 17, and has a structure that is the same as or similar to that described above, or a structure that is suitably desired. Although provided, this lower nozzle device is omitted in the drawing.

Therefore, the nozzle holder 3 is attached to the mounting flange 3.
a, a nozzle chamber 3b, a wire electrode insertion hole 3c, an electrode guide attachment hole 3d, a machining fluid supply pipe attachment hole 3e, and a threaded portion 3g; an electrode auxiliary guide 15b is firmly fitted into the electrode guide attachment hole 3d; Nozzle chamber 3
The nozzle 4 is fitted into b with the O-ring 13,
Furthermore, a cap nut 7 is attached.

After that, attach the flange 3 to this nozzle device 2.
It is attached to the arm 1 using a mounting bolt (not shown) or the like.

Further, the mounting flange portion 5a provided at one end of the main nozzle 5 is attached to the step portion 6a of the auxiliary nozzle 6, and the auxiliary nozzle 6 is attached to the nozzle holder 3.
installed on. In addition, the auxiliary nozzle 6 includes
A machining fluid supply pipe attachment hole 6 is provided in a portion corresponding to the machining fluid supply pipe attachment hole 3f provided in the nozzle holder 3.
c is provided, and a large number of filament bodies 18, 18 are attached around the machining liquid spout of the auxiliary nozzle 6, and a workpiece 17 of the auxiliary nozzle 6 is provided.
The inner diameter of the corresponding portion is narrowed as necessary, and the area of the ejection passage 6b is reduced so that an appropriate amount of machining fluid can be supplied.

A first machining fluid supply pipe 8 is connected to the machining fluid supply pipe attachment hole 3e of the nozzle holder 3, and a machining fluid supply pipe 8 is connected to the machining fluid supply pipe attachment hole 3f of the nozzle holder 3 and the machining fluid supply of the auxiliary nozzle 6. In the pipe mounting hole 6c,
A second machining fluid supply pipe 9 is connected. The first machining fluid supply pipe 8 is connected to the machining fluid supply device 10.
Furthermore, the second machining fluid supply pipe 9 is connected to a machining fluid supply device 11.

Each of the above machining fluid supply devices 10 and 11
Although it is composed of a known pump, an accumulator, a check valve, etc., it is also possible to construct it as a single machining fluid supply device. Further, from the processing fluid supply devices 10 and 11, a first
The pressure, flow rate, supply speed, etc. of the machining fluid supplied via the second machining fluid supply pipes 8 and 9 are configured to be collectively controlled by a control device (not shown). .

Further, the wire electrode 12 is supplied from an electrode supply device (not shown), drawn into the inside of the nozzle device 2 from the wire electrode insertion hole 3c of the nozzle holder 3 via the guide pulley 16, and auxiliary guide 15b,
and the positioning guide 15 from the guide holder 15
a to the ejection path 5b of the main nozzle 5 of the nozzle 4
It passes through the processing hole of the workpiece 17, passes through the other nozzle, positioning guide, etc. (not shown), and is collected by the collection device.

When machining is performed using the wire-cut electric discharge machining apparatus according to the present invention, there are various methods of jetting and controlling the machining fluid. Machining fluid is supplied to the gap portion, and when machining progresses to a certain extent, the machining fluid is supplied from the auxiliary nozzle 6 in addition to the main nozzle 5 while the jetting pressure, jetting amount, etc. of the machining fluid are controlled.

At this time, a large number of filamentous bodies 18, 18 attached around the ejection port of the auxiliary nozzle 6 spread on the surface of the injected machining fluid, or some of them spread onto the surface of the workpiece.
Since the injected machining fluid enters the machining hole formed in the main nozzle 5 and the workpiece 17, there is no possibility that many splashes will be generated, and the equipment is prevented from being eroded by the machining fluid. Since the machining fluid supplied from the auxiliary nozzle 6 at a predetermined pressure can be reliably supplied to the machining portion of the workpiece 17, air entrainment phenomena that occur when machining fluid is supplied are also prevented. Wire cut electrical discharge machining can now be performed stably over a long period of time.

Note that the filament bodies 18, 18 are usually made of synthetic resin fibers, films, etc.
Further, the length thereof is changed as appropriate depending on the thickness of the workpiece 17, and in general processing, a length within approximately the same length as the thickness of the workpiece 17 is used. .

Next, FIGS. 3 and 4 will be explained.

In FIGS. 3 and 4, 19 is the upper arm of the wire cut electric discharge machining apparatus, and 20 is the upper arm 1.
A nozzle device is attached to 9, 21 is a nozzle holder, 22 is a main nozzle 22a, and the main nozzle 22a is provided as a center on the outside thereof, and each has a conical inner wall surface that narrows in the direction in which the machining fluid is ejected. and a machining fluid supply nozzle consisting of auxiliary nozzles 22b and 22c forming concentric machining fluid ejection holes centered on the opening of the main nozzle 22a; 23 is a machining fluid supply nozzle for supplying machining fluid to the main nozzle 22a; One machining fluid supply pipe, 24 and 25 are second machining fluid supply pipes that supply machining fluid to the auxiliary nozzle 22b, 26 and 27 are third machining fluid supply pipes that supply machining fluid to the auxiliary nozzle 22c, 28,2
9, 30, 31 and 32 are the first machining fluid supply pipes 2
3. A machining fluid supply device that supplies machining fluid at high pressure to the second machining fluid supply pipes 24, 25 and the third machining fluid supply pipes 26, 27, 33 is an electrode auxiliary guide for the wire electrode 34, and 35 is a main nozzle. A positioning guide die is usually attached to a guide holder (not shown) as shown in FIG. 1 above so as not to obstruct the spouting of machining fluid 22a, 36 is a guide pulley for the wire electrode 34, and 37 is a support (not shown). A workpiece supported by the device, 38 is a cap nut, 39,
Numeral 39 is a thread-like body attached around the ejection port of the auxiliary nozzle 22b.

Note that the same or a different type of nozzle is usually attached to the lower arm of the nozzle device so as to face the nozzle device 20 through the workpiece 37, but the nozzle device attached to this lower arm is omitted. .

The machining fluid supply nozzle 22 is provided coaxially with the path of the wire electrode 34, and includes a main nozzle 22a that spouts machining fluid at high speed, and the main nozzle 22a.
The auxiliary nozzles 22b and 22c are provided twice on the outside of the nozzles 22b and 22c, each forming a concentric machining fluid ejection hole centered on a conical inner wall surface that narrows in the machining fluid jetting direction.

The cone apex angle of the auxiliary nozzle 22b is smaller than the cone apex angle of the outer auxiliary nozzle 22c, and the cone apex angle of the auxiliary nozzle 22b is approximately 30
The cone apex angle of the auxiliary nozzle 22c is approximately 45 degrees. The machining fluid is supplied to the main nozzle 22a from the machining fluid supply device 28 via the first machining fluid supply pipe 23,
Further, the auxiliary nozzles 22b and 22c are provided with second machining fluid supply pipes 24, 25 and a third machining fluid supply pipe 2.
Machining fluid is supplied from machining fluid supply devices 29, 30 and 31, 32 via 6, 27.

The machining fluid supply devices 28, 29, 30, 31, and 32 are each composed of a pump, an accumulator, a check valve, etc. as is well known, but they may also be configured as a single machining fluid supply device. It is possible. In addition, the processing fluid supply device 2
8, 29, 30, 31 and 32 to the first, second and third machining fluid supply pipes 23, 24, 25 and 2
The pressure, flow rate, supply pressure, etc. of the machining fluid supplied via the pipes 6 and 27 are configured to be collectively controlled by a control device (not shown).

Further, the wire electrode 14 is supplied from a wire electrode supply device (not shown), and the wire electrode 14 is supplied from a guide pulley 36.
Wire electrode insertion hole 2 of nozzle holder 21 through
1a into the nozzle device 20, passes through the electrode guide 33, passes through the main nozzle 22a of the machining fluid supply nozzle 22, passes through the die 35 provided in the main nozzle 22a, and then passes through the workpiece 37. It passes through the processed hole and is collected by a wire electrode collection device (not shown).

Further, a large number of filamentous bodies 39, 39 made of synthetic resin are attached around the spouting port of the auxiliary nozzle 22b, and the filamentous bodies 39, 39 adjust the spouting direction of the machining liquid that is spouted and supplied during machining. , further prevents air entrainment from occurring, and
This prevents the sprayed machining fluid from hitting the workpiece 37 and causing splashes.

When machining is performed using the wire cut electrical discharge machining apparatus according to the present invention, machining fluid is supplied at high pressure from the main nozzle 22a to the machining gap portion of the workpiece 37, and at the same time, the machining fluid is supplied to the machining gap portion of the workpiece 37 from the main nozzle 22a.
2b, machining liquid is supplied to the machining gap portion of the workpiece 37 at a pressure that is approximately the same as the supply pressure of the main nozzle 22a or slightly lower than the supply pressure of the main nozzle 22a, and machining is performed to a certain extent by a predetermined amount. ,
Or, when the process reaches a predetermined position, the machining fluid is supplied from the auxiliary nozzle 22c at a pressure slightly lower than the supply pressure of the auxiliary nozzle 22b, or temporarily, and when the next predetermined position is reached, the machining fluid is temporarily supplied again. Wire cut electric discharge machining is performed as described above.

A part of the many thread-like bodies 39, 39 attached around the spout of the auxiliary nozzle 22b enters the processing hole formed in the workpiece 37 during processing, and the other thread-like bodies 39, 39 enter the workpiece The main nozzle 2
The machining liquid ejected from the auxiliary nozzle 2a and the auxiliary nozzle 22b is reliably supplied to the machining portion of the workpiece 37, and the machining liquid ejected from the auxiliary nozzle 22c is supplied via the filaments 39, 39. Splashes are no longer generated at the part where the injected machining fluid hits the workpiece 37, and the device is prevented from being eroded by the machining fluid.
Since it is possible to reliably supply the machining fluid supplied at a predetermined pressure from the auxiliary nozzles 22b and 22c to the machining portion of the workpiece 37, the phenomenon of air entrainment that occurs when machining fluid is supplied can be avoided. This also prevents wire cut electrical discharge machining from occurring in a stable manner over a long period of time.

As described above, according to the present invention, the workpiece 3
It is possible to always reliably and sufficiently supply machining liquid into the machining gap 7, and furthermore, there is no air entrainment, so wire cut electric discharge machining can proceed smoothly and at a high machining speed. It is possible to do so.

〔Effect of the invention〕

Since the present invention is constructed as described above, according to the present invention, a sufficient amount of machining liquid is constantly and reliably delivered to the machining gap portion of the workpiece at high speed so as to prevent air from being entrained. Because of this, not only normal straight line processing but also corner processing can be performed with high precision while maintaining the normal processing speed.

Note that the present invention is not limited to the embodiments described above. That is, for example, in this embodiment, the filamentous body is attached to the surface of the auxiliary nozzle 6 or 22b facing the workpiece, but the same effect can be achieved even if it is attached to the side surface of the auxiliary nozzle. . Also, one or both of the main nozzle and the auxiliary nozzle in FIG. 1 may be floating nozzles, and
The auxiliary nozzles 22b and 22c in FIG. 3 may have a coaxial nozzle configuration as shown in FIG. 1, and the number of auxiliary nozzles is one or two, but the number of auxiliary nozzles is not limited to these. Moreover, the cone apex angle of each auxiliary nozzle can also be changed as appropriate depending on processing conditions or processing purposes. In addition, the wire electrode supply method, the shape of the main nozzle and the auxiliary nozzle, the machining fluid supply method, the control method of each part, etc. can be freely changed in design within the scope of the purpose of the present invention. It encompasses all of them.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing one embodiment of a machining fluid supply nozzle device for a wire-cut electric discharge machining apparatus according to the present invention, FIG. 2 is an enlarged perspective view of the nozzle portion thereof, and FIG. 3 is another embodiment. FIG. 4 is a top view taken along line AA in FIG. 3. 1... Arm, 2, 20... Nozzle device, 3,
21... Nozzle holder, 4, 22... Nozzle,
5, 22a...main nozzle, 6, 22b, 22
c... Auxiliary nozzle, 7, 38... Cap nut, 8,
23...First machining liquid supply pipe, 9, 24, 25...
...Second machining fluid supply pipe, 10, 11, 28, 2
9, 30, 31, 32... Processing fluid supply device, 1
2, 34... Wire electrode, 13, 14... O ring, 15a, 35... Electrode guide, 15b, 33...
... Electrode auxiliary guide, 16, 36 ... Guide pulley, 1
7, 37... workpiece, 18, 39... filamentous body,
19... Upper arm, 26, 27... Third machining liquid supply pipe, 35... Dice.

Claims (1)

[Scope of Claims] 1. A wire-cut electric discharge machining device that performs electric discharge machining while applying a predetermined voltage pulse between a wire electrode and a workpiece and supplying machining fluid by jetting it from a machining fluid supply nozzle into the machining gap. A machining fluid injection nozzle device comprising: a main nozzle provided coaxially with a wire electrode path and jetting machining fluid at high speed; and at least one auxiliary nozzle having a concentric opening centered on the main nozzle. A machining fluid supply nozzle device for a wire-cut electrical discharge machining device comprising: a machining fluid supply nozzle device for a wire-cut electrical discharge machining device, characterized in that a number of filaments are attached around at least one machining fluid spout; . 2. A machining fluid supply nozzle device for a wire-cut electrical discharge machining apparatus according to claim 1, wherein the filamentous body is made of synthetic resin. 3. A machining fluid supply nozzle for a wire-cut electrical discharge machining apparatus according to claim 1 or 2, wherein the auxiliary nozzle is provided in duplicate, and the cone apex angle of the outer auxiliary nozzle is larger than that of the inner auxiliary nozzle. Device. 4. A machining fluid supply nozzle device for a wire-cut electric discharge machining apparatus according to claim 1, 2, or 3, wherein the auxiliary nozzle is slidable in the direction of its central axis.