JP2719112B2 - Wire guide unit in wire cut electric discharge machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art FIGS. 11 and 12 show a conventional example of a wire guide unit capable of automatically connecting a wire electrode 20. FIG. In this conventional example, a connection liquid flow path 30 is formed in the wire guide unit, and the connection liquid flow path 30 is formed.
Is discharged from the jet nozzle 41 as a narrow column-shaped jet. On the other hand, the wire electrode 20
Is supplied from the wire bobbin (not shown) or the like to the sub-guide block 81, and the wire guide holder 12
Is guided by a wire guide 11 formed at the tip of the work, and is guided by a jet flow from the jet nozzle 41 to an initial hole of a work (not shown) or a lower unit arranged on the opposite side of the work.

[0005] In FIG. 11, reference numeral 50 denotes a working fluid flow path.

[0004]

However, in the above-described conventional example, the automatic connection liquid is guided to the connection liquid flow path 30 from the jet liquid supply port 31 formed in the side wall of the wire guide unit, and is connected in the circumferential direction. In order to reach the jet nozzle 41 while rotating, and to jet from the jet nozzle 41, water is sprinkled by centrifugal force as shown by an arrow in FIG. 12, and the wire electrode 20 cannot be guided to an accurate position. The automatic connection at the time of so-called immersion processing in which the work is immersed in the processing liquid has a disadvantage that the energy of the jet flow is dispersed, so that it is difficult to restrain the wire electrode 20. Was.

[0005] The present invention has been made to solve the above-mentioned drawbacks, and has as its object to provide a wire guide unit capable of accurately guiding a wire electrode to a predetermined position.

It is another object of the present invention to prevent scattering of a jet from a processing nozzle.

[0007]

According to the present invention, there is provided a wire guide body 10 having a wire guide 11 at a distal end thereof for guiding a wire electrode 20, as shown in FIG.
Connection liquid flow path 30 between outer peripheral wall of wire guide body 10
Is formed, and a machining liquid flow path 50 is formed between the automatic connection nozzle body 40 for ejecting the connection liquid flow from the jet nozzle 41 at the tip and the outer peripheral wall of the automatic connection nozzle body 40, and the machining of the tip is performed. A processing nozzle body 60 for jetting a processing liquid from a liquid discharge port 61, and the connection liquid flow path 30 is divided into two chambers 32 on a jet liquid supply port 31 side and a jet nozzle 41 side by a rectilinear blocking part 70; 33, and the rectilinear blocking section 70 prevents the liquid flow from going straight, and directs the liquid flow via a bypass that makes an angle with the rectilinear direction as appropriate.
This is achieved by providing a wire guide unit in a wire electric discharge machine configured to guide to a wire.

[0008]

In the present invention, the connection liquid flow path 30 of the wire guide unit is divided into two chambers 32, 33 on the jet liquid supply port 31 side and the jet nozzle 41 side by the rectilinear blocking portion 70. The automatic connection liquid flow that has flowed into the chamber 32 on the side of the jet liquid supply port 31 is prevented by the rectilinear blocking unit 70 from going straight through the liquid flow, and passes through a detour that forms an appropriate angle with the rectilinear direction. It is led to the chamber 33. The automatic connection liquid flow that has flowed into the chamber 32 on the side of the jet liquid supply port 31 at a predetermined inflow velocity and direction is initially rectified in the linear movement prevention unit 70 at the initial speed, direction, etc. From the jet nozzle 41, a jet having a precise jet direction and having a columnar shape is obtained. As a result, the purpose of accurately guiding the wire electrode 20 is achieved, and the transfer energy of the wire electrode 20 can be improved, so that the reliability of the connection operation of the wire electrode 20 during immersion processing can be improved.

According to the second aspect of the present invention, the straight movement preventing portion 70 is provided in the machining fluid flow path 50 and makes the ejection direction of the machining fluid jet ejected from the machining fluid jet port 61 accurate.
In addition, a jet of a working fluid having a high energy efficiency is formed in the form of a small column without spraying water. As a result, the object of improving the efficiency of removing machining residues, preventing the dispersion of discharge energy, and improving the machining efficiency is achieved.

In the first and second aspects of the present invention , the straight movement preventing portion 70 includes a pipe including a horizontal path 71 for guiding the liquid flow flowing from the inlet 71 a in a direction perpendicular to the center line of the wire guide body 10. It is configured as a road. The introduction port 71a and the discharge port 71b to the horizontal path 71 are arranged at positions where they do not overlap in a plan view, and the liquid flow that has flowed into the jet liquid supply port 31 or the chambers 32 and 52 on the side of the processing liquid supply port 51 remains unchanged. Jet nozzle 41 or machining fluid jet 6
It is prevented from going straight to the chambers 33 and 53 on the first side.

According to the sixth, seventh and eighth aspects of the present invention , the wire guide unit having a simpler structure of the straight movement preventing portion 70 is provided.
Provided.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 3 shows the overall configuration of the wire guide unit. The wire guide unit is a sub-guide block 8 fixed to the upper end surface of the main block 80.
1, a wire guide body 10 arranged to face the sub guide block 81, an automatic connection nozzle body 40 arranged to surround the wire guide body 10, and a process surrounding the automatic connection nozzle body 40. Nozzle body 60.

The sub-guide block 81 has a sub-guide 81a formed of a hard material such as ruby and having excellent insulation performance at the lower end thereof.
In cooperation with the zero wire guide 11, the wire electrode 20 is held in a vertical posture. A power supply 82 is mounted on the main block 80, and the wire insertion hole 8 of the main block 80 is provided.
A discharge pulse is applied to the wire electrode 20 in sliding contact with the wire electrode 20 passing through the inside of the wire electrode 0a.

As shown in detail in FIGS. 1 and 2, the wire guide body 10 is formed of stainless steel or the like.
A wire guide holder 12 having a through hole 12a concentric with the sub guide block 81;
And a wire guide 11 held by a step 12b formed at the open end of the second through hole 12a. The wire guide holder 12 is screwed or press-fitted into the lower end of the main block 80 and mounted. The wire guide 11 is formed by holding a dice body 11a and a sintered body 11b, each of which is formed into a bead shape by diamond, so as to be sandwiched by a sub-guide 11c. The sub-guide 11c is formed of a hard and highly insulative material such as sapphire, ruby, and ceramic, and guides the wire electrode 20 to a guide hole of the die body 11a at a portion where the wire electrode 20 is inserted. Frusto-conical guide hole 11d is provided.

The automatic connection nozzle body 40 is a bottomed cylindrical member that surrounds the wire guide body 10 and forms a connection liquid flow path 30 between the wire guide body 10 and the outer peripheral wall. It is fixed to the main block 80 at the flange 42 formed in the opening (see FIG. 3). At the center of the bottom wall of the automatic connection nozzle body 40, a jet nozzle 41 for ejecting the connection liquid flow supplied from the jet liquid supply port 31 to the connection liquid flow path 30 via the introduction path 34 is provided. It is formed.

As shown by hatching in FIG. 1, the connection liquid flow path 30 has a chamber 32 communicating with the introduction path 34.
And a chamber 33 that communicates with the jet nozzle 41. Between the two chambers 32 and 33, a rectilinear blocking part 70 is formed. The rectilinear blocking section 70 is a meandering channel having a U-shaped cross section in which the outer peripheral portions of the two ring-shaped horizontal paths 71, 71 are connected by a ring-shaped connecting path 72, and the horizontal path 71 located below is It is formed in a gap between the step 43 formed on the inner wall of the automatic connection nozzle body 40 and the back surface of the disc-shaped flange 12c protruding from the outer peripheral wall of the wire guide holder 12, and is formed upward. The located horizontal path 71 is supported on the upper surface of the disc-shaped flange 12c and the support seating surface 44 formed above the step 43, and the wire guide holder 1
A connection path 72 is formed in the gap between the outer peripheral wall of the disc-shaped flange portion 12c and the rising wall of the circular step portion. Is done. The ring-shaped plate 83 has a plurality of holes formed concentrically and at equal intervals.
It is said.

The straight movement preventing portion 7 constructed as described above
Numeral 0 is provided to prevent the connection liquid flow flowing into the chamber 32 on the jet liquid supply port 31 side from going straight to the chamber 33 on the jet nozzle 41 side. The inlet 71a to the meandering channel and the outlet 71b from the meandering channel are connected to the upper horizontal passage 71 so that no straight route is formed between the chamber 32 and the chamber 33 on the jet nozzle 41 side. A connection path 72 also serving as an outlet 71b and an introduction port 71a of a lower horizontal path 71, and a plan view;
Specifically, they are arranged at positions where they do not overlap in the direction of arrow A in FIG.

On the other hand, the processing nozzle body 60 surrounds the automatic connection nozzle body 40, and
The processing liquid is mounted so as to form a processing liquid flow path 50 between itself and the outer peripheral wall of the processing liquid, and the processing liquid introduced into the processing liquid flow path 50 from the processing liquid supply port 51 is ejected from the processing liquid ejection port 61 as a jet. Is done.

Therefore, in this embodiment, the connection liquid flow supplied from the jet liquid supply port 31 is first guided to the chamber 32 on the side of the jet liquid supply port 31 and then directed horizontally in the rectilinear blocking section 70. It is converted and reaches the chamber 33 on the jet nozzle 41 side. The jet liquid flow on the side of the jet nozzle 41 is rectified in the rectilinear blocking part 70 which is a detour, and flows out to the side of the jet nozzle 41 as it is, and is directed accurately toward the initial hole of the work. A jet is generated.

Although FIG. 1 shows the case where the straight movement preventing portion 70 is constituted by one meandering flow channel, as shown in FIG. 4, the straight movement preventing portion 70 is formed by a plurality of meandering flow passages. It is also possible to form the straight traveling blocking portion 70 with only one horizontal path 71, and also in this case, the introduction port 71a and the discharge port 71b to the horizontal path 71 do not overlap in plan view. Placed in the position. Further, the method of forming the rectilinear blocking portion 70 is not limited to the method described in the above-described embodiment. For example, as shown in FIG. It is also possible to adopt a configuration in which it is fitted externally to the wire guide holder 12. In this case, the introduction port 71a and the discharge port 71b do not have to be circular holes as shown in FIG. As shown, the discharge port 7 is formed in a notch shape, and is formed between the outer peripheral wall of the wire guide holder 12 or the inner peripheral wall of the automatic connection nozzle body 40.
1b or the inlet 71a can also be formed.

In the description of these modifications and other embodiments described below, the same components as those in the above-described embodiment are denoted by the same reference numerals in the drawings, and description thereof will be omitted. FIG. 7 shows a second embodiment of the present invention. This embodiment is a modification that is effective for forming the rectilinear blocking portion 70 with a simpler configuration. The attachment of the filter material 76 to the connection liquid flow path 30 can be performed by press-fitting, joining, and further by a receiving material formed on the outer peripheral wall of the wire guide holder 12 or the inner peripheral wall of the automatic connection nozzle body 40. It is possible. As shown in FIG. 7B, the filter material 76 is a sintered body of the particles 73, 73... For example, a well-known oil filter can be used. The porosity of the filter material 76 is determined in consideration of the supply pressure of the jet liquid flow and the like.
Suitable for this purpose is a sintered body in which three to eight spherical particles having a sphere of about 0.3 to 1.5 are stacked. Note that the granules 73
In addition to the spherical body, various things such as an elliptical sphere, a columnar body, and an amorphous body can be used. Also,
The use of a sintered body has the advantage that it is easy to handle because it is integrated as a whole, but it does not necessarily require sintering. It is also possible to constitute so that the granules are sandwiched between the porous receiving plates.

Accordingly, in this embodiment, the flow of the automatic connection liquid introduced into the chambers 32 and 33 on the side of the jet liquid supply port 31 is changed to the granular material 7 as shown by the arrow in FIG.
As a result of the forced change of direction by the nozzles 3, 73,...
The straight traveling to the side chamber 33 is hindered.

8 and 9 show modified examples of the filter material 76. FIG. The filter material 76 in this modification is, for example, a steel wool-shaped filter material, and the flexible filter material 76 as a whole is sandwiched between support plates 74 and 75 provided in the connection liquid flow path 30 and is positioned at a predetermined position. Is held. The support plates 74, 75 have a large number of through holes 74a, 74a,.
5a, 75a,... Are open plate-shaped members, and are fitted to the outer peripheral wall of the wire guide holder 12. Further, the upper support plate 74 is kept at a constant distance from the lower support plate 75, and the upper support plate 74 is pressed downward by the water pressure of the jet flow, so that the gap of the flexible filter material is excessively increased. A stopper tube 74b is provided to prevent the flow passage from being crushed and closed. The stopper tube 74b can be provided on the lower support plate 75 side, and can be formed in a boss shape. In FIG. 8, reference numeral 12d denotes a support step formed on the outer peripheral wall of the wire guide holder 12 for holding the lower support plate 75 at a predetermined position.

FIG. 10 shows a third embodiment of the present invention. This embodiment shows a configuration for rectifying a machining liquid jet. The rectification of the machining fluid jet is effective for reliably supplying the machining fluid to the machining portion of the workpiece 90 to improve machining efficiency or for ensuring the residue removal operation. It is configured by disposing the blocking unit 70. The configuration shown in each of the above-described embodiments can be employed as it is for the straight traveling prevention unit 70.

Incidentally, in FIG.
Although the case where the rectilinear blocking portion 70 is formed only inside is shown, it is of course possible to form the rectilinear blocking portion 70 also in the connection liquid flow path 30.

In the embodiment shown in FIG. 10, the automatic connection nozzle body 40 is arranged between the wire guide body 10 and the processing nozzle body 60 to form the connection flow path 30, so that the automatic connection is performed. Although it is configured so that it is possible, when the automatic connection specification is not adopted, the automatic connection nozzle body 40 is removed and the processing nozzle body 6 is provided around the wire guide body 10.
0 may be arranged to form the machining liquid flow path 50 between the wire guide body 10 and the outer peripheral wall.

[0027]

As is apparent from the above description, according to the present invention, since the jetting direction of the jet stream for automatic connection can be accurately regulated and the spread of the jet stream can be prevented, The guide operation reliability of the electrode can be improved.

In the case where the straight flow preventing portion is formed in the machining liquid flow path, the spread of the jet from the machining liquid jet port can be prevented, and the machining efficiency can be improved.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part showing an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a wire guide.

FIG. 3 is an overall view of a wire guide unit.

FIG. 4 is a sectional view showing a modification of FIG.

FIG. 5 is a sectional view showing still another modification of FIG. 1;

FIG. 6 is a plan view showing a ring body.

FIGS. 7A and 7B are views showing a second embodiment of the present invention, wherein FIG. 7A is a sectional view and FIG. 7B is an enlarged view of a filter material.

FIG. 8 is a sectional view showing a modification of FIG. 7;

FIG. 9 is a view showing a filter material, (a) is an exploded perspective view,
(B) is a partial sectional perspective view showing an assembled state.

FIG. 10 is a sectional view showing a third embodiment of the present invention.

FIG. 11 is a sectional view showing a conventional example.

FIG. 12 is an enlarged view of a main part of FIG. 11;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Wire guide body 11 Wire guide 20 Wire electrode 30 Liquid flow path for connection 31 Jet liquid supply port 32, 33 room 40 Nozzle body for automatic connection 41 Jet nozzle 50 Processing liquid flow path 51 Processing liquid supply port 52, 53 Room 60 Processing Nozzle body 61 Machining fluid jet port 70 Straight-travel preventing section 71 Horizontal path 71a Inlet port 71b Outlet port 76 Filter material

Claims (8)

(57) [Claims] 1. A connection liquid flow path is formed between a wire guide body provided with a wire guide at a tip thereof to guide a wire electrode, and an outer peripheral wall of the wire guide body, and a connection liquid flow is formed from a jet nozzle at the tip. And a processing nozzle body that forms a processing liquid flow path between the outer peripheral wall of the automatic connection nozzle body and that discharges the processing liquid from the processing liquid jet port at the tip end. The connection liquid flow path is configured to wire the liquid flow flowing from the introduction port to a wire.
Includes a horizontal path leading in a direction perpendicular to the electrode insertion direction.
Inlet and outlet to the horizontal path
Are positioned at a position where they do not overlap in a plan view.
A wire cut discharge configured to prevent the liquid flow from going straight and guide the liquid flow to the chamber on the jet nozzle side via a detour that forms an angle with the straight traveling direction as appropriate. Wire guide unit in processing machines. 2. A wire guide body provided with a wire guide at a tip thereof to guide a wire electrode, and a machining fluid flow path formed around the wire guide body, and a machining fluid spouted from a machining fluid spout at the tip end. A nozzle body, and the machining fluid flow path is configured to wire fluid flowing from the inlet into a wire.
Includes a horizontal path leading in a direction perpendicular to the pole insertion direction
An inlet and an outlet to the horizontal path formed by a pipe;
Are divided into two chambers, a working fluid supply port side and a working fluid ejection port side, by a rectilinear blocking part disposed at a position where they do not overlap in plan view , and the rectilinear blocking part prevents the liquid flow from going straight, and A wire guide unit in a wire-cut electric discharge machine configured to guide a machining fluid flow to a chamber on the machining fluid ejection port side via a detour path which is appropriately angled. 3. An introduction port to said horizontal path, wherein a wire guide body is provided.
3. A wire guide unit in a wire electric discharge machine according to claim 1 , wherein an appropriate number of the wire guide units are arranged on concentric circles centered on a center line of the wire cut electric discharge machine. 4. The wire guide unit according to claim 3, wherein the horizontal path is formed in a ring shape . 5. A meandering flow in which a plurality of said horizontal paths are arranged opposite to each other.
The wire guide unit in the wire electric discharge machine according to claim 4, which constitutes a path . 6. A wire electrode is provided with a wire guide at the tip.
A liquid flow path for connection is formed between the wire guide body to be guided and the outer peripheral wall of the wire guide body
And eject the liquid flow for connection from the jet nozzle at the tip
Formation and automatic wire connection nozzle body, the working fluid flow path between the outer peripheral wall of the automatic wire connection nozzle body
For machining that ejects machining fluid from the machining fluid outlet at the tip
And a liquid passage for connection , wherein a porous filter material is disposed in the passage.
The jet liquid supply port side by the
And a jet nozzle side, and the straight movement preventing portion prevents the liquid flow from going straight, and is suitable for the straight running direction.
The liquid flow is directed to the jet nozzle side
A wire guide unit in a wire electric discharge machine configured to be guided to a chamber . 7. A wire electrode provided with a wire guide at the tip.
A wire guide body to guide and a machining fluid flow path around the wire guide body
A processing nozzle that jets the processing liquid from the working liquid
The processing liquid flow path has a porous filter material disposed in the flow path.
The processing fluid supply port side and the processing
It is divided into two chambers of the liquid ejection outlet side, One or rectilinear blocking unit prevents the straight liquid flow, suitable and straight direction
Machining fluid flow through machining fluid outlet via bypass
A wire guide unit in a wire-cut electric discharge machine configured to be guided to a room . 8. The filter material is a granular sintered body.
A wire guide unit in the wire electric discharge machine according to claim 6 .