JPH0749172B2 - Wire electrode guide method and device for wire electric discharge machine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a wire electric discharge machine, and in particular, a work piece and a wire electrode are separately arranged above and below an electric discharge machine part facing each other with a minute gap. In a pair of wire electrode guides, the wire electrode guide hole that guides and supports the wire electrode in a fixed path can be expanded and contracted according to the size of the wire electrode diameter. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire electrode guide method and device for a wire electric discharge machine in which the wire electrode is inserted and guided appropriately and easily so that the wire electrode can be freely expanded.

[Conventional technology]

Generally, in a wire electric discharge machine, a work piece and a wire electrode are opposed to each other through a minute gap, and an electric current is applied to both of them to generate an electric discharge in the minute gap, and the work piece and the wire electrode are relatively moved. Then, the work piece is processed by the energy of the electric discharge. The wire electrode is constantly sent from the storage reel to the wire electrode winding roller or the wire electrode collection box through the electric discharge machining section facing the work piece, and a measure to prevent the occurrence of a wire breakage accident due to electrode consumption during discharge is taken. Has been taken. Further, conventionally, in a wire electric discharge machine, wire electrode guides are provided above and below the electric discharge machining part, and a wire electrode guide device for guiding the wire electrode in the longitudinal direction is constituted by both of these wire electrode guides, and a wire electrode guide is always provided. A structure is adopted in which the electrical discharge machining accuracy is maintained by maintaining a constant state of the opposing arrangement between the object and the wire electrode via a minute gap. The wire electrode guide also has means for supplying cooling water to the wire electrode and machining fluid to the electric discharge machining section to stabilize the electric discharge machining.

However, it is difficult to completely avoid the occurrence of disconnection accidents due to variations in discharge energy and nonuniformity of wire diameters of wire electrodes in the electric discharge machining section. For this reason, when a wire breakage accident occurs, the wire electrode passage of the wire electrode guide is temporarily expanded to guide and insert a new wire of the wire electrode, so-called automatic connection structure that enables so-called automatic loading is also common. Is provided as an indispensable structure. Also,
The wire electrode guide must support the wire electrode accurately so that a constant tension is always applied to the wire electrode in order to suppress the vibration of the wire electrode due to the discharge repulsion force as much as possible. Must meet strict requirements in terms of precision and wire electrode support strength.

And, in the wire electrode guide portion of the wire electrode guide,
Two types of guides are used, which are called split guides and non-split guides. Here, the split-type guide is a method in which a wire electrode is sandwiched between two or more guides and pressed and supported, and a V-groove guide is typical. Further, the non-divided type guide is a die guide as a typical method in which a through hole corresponding to the diameter of the wire electrode is provided in an integrally formed guide and the wire electrode is inserted and supported therein.

The above two types of guides have the following characteristics, and are used depending on the respective cases.

For example, a V-groove guide has a structure in which a wire electrode is passed through the V-groove of a wire guide block having a V-groove, and the wire electrode is pressed against the V-groove by a pressing plate.
Since it is pressed against the surface and the pressing plate and reliably supported at three points, it is possible to eliminate the play of the wire electrode holding portion that adversely affects the processing accuracy. The greatest feature of the V-groove guide is that by separating the V-groove forming surface of the guide from the push plate, the wire electrode passage can be expanded and the above-mentioned automatic connection can be easily performed. V
An automatic wire connection mechanism using the groove guide is disclosed in Japanese Patent Publication No. 61-54530 filed by the present applicant.

As described above, the V-groove guide is very advantageous for automatic connection, but has some problems. For example, since the wire electrode is supported only at three points on the V-groove surface and the pressing plate surface, the supporting point moves between the three points depending on the direction of the reaction force during cutting, and the shape of the processed product becomes There is a problem that it tends to shift from a perfect circle to a triangle (rice ball shape). In addition, there is a problem that the wire electrode falls off the guide when a strong force is applied. There is a problem that space is required and the distance between the upper and lower wire electrode guides becomes large.

On the other hand, since the die guide has a structure in which the wire electrode is inserted into a hole provided in the guide instead of sandwiching the wire electrode like a V-groove guide, dropping of the wire electrode is not a problem.
Further, since the guide is not opened and closed, the space for that is not required, and the distance between the upper and lower wire electrode guides can be reduced, which is advantageous in terms of processing accuracy. However, on the other hand, it is difficult to perform automatic connection, and it is necessary to make the insertion hole diameter larger than the wire electrode diameter, and this play reduces the machining accuracy.
There are problems such as. In order to solve some of the problems of the die guides mentioned above, recently, it is possible to open and close the die guides by dividing them into two parts, which is advantageous for automatic connection. However, when joining the divided guides, In order to eliminate the deviation of the insertion hole, the precision of the guide and the precision of the opening / closing mechanism are severely demanded, which makes it difficult to manufacture.

[Problems to be Solved by the Invention]

As described above, in the wire electrode guide of the conventional example, it was extremely difficult in principle to simultaneously satisfy the requirements regarding automatic connection and the requirements regarding processing accuracy.

An object of the present invention is to provide a wire electrode guiding method and device based on a new operating principle, which solves these problems of the conventional V groove guide and die guide.

That is, the object of the present invention is to have a good automatic wire connection structure capable of greatly expanding the wire electrode passage during automatic wire connection, and to support the wire electrode at multiple points of 3 or more points without play or rattling in order to obtain processing accuracy. It is to provide a wire electrode guiding method and device capable of performing the above.

[Means for Solving the Problems]

In order to solve the above-mentioned problems, according to the present invention, an integer (n) of three or more guide segments are collectively arranged, and a wire electrode insertion hole having a polygonal shape is formed at the center thereof. Provided are a wire electrode guiding method and a wire electrode guiding device for holding a wire.

More specifically, in a wire electrode guide method for a wire electric discharge machine, at least one of a pair of wire electrode guides that are spaced apart from each other on both sides of the machined portion is an integer number of 3 or more, and its cross section is an isosceles side. Triangular guide segments are arranged so that their isosceles are adjacent to each other, and each of the guide segments is guided and moved in synchronism along the base of the isosceles triangle, at the center of the aggregate of the guide segments. There is provided a wire electrode guide method for a wire electric discharge machine, characterized in that a wire electrode is inserted through a formed polygonal hole to guide and support the wire electrode. In addition, in the wire electrode guide device of the wire electric discharge machine, at least one of the pair of wire electrode guides which is arranged on both sides of the machining part is spaced apart from each other by an integer of three or more, and the cross section has an isosceles triangular shape. The guide segments are assembled so that their isosceles are adjacent to each other, and a wire electrode is inserted through the center of the guide segment to guide and support the wire electrode guide portion forming a polygonal wire electrode insertion hole, and each of the guide segments. A moving guide means that is stable so as to be able to move along the base of the isosceles triangle while keeping the isosceles in contact with each other, and synchronizes the guide segments between the contracted position and the expanded position of the wire electrode insertion hole. The wire electrode insertion hole has a size corresponding to the amount of movement of each of the guide segments. Wire electric discharge machine of the wire electrode guide apparatus characterized in that it is a large reduction adjustment is provided.

[Action]

With the above structure, when the automatic wire connection is performed, the guide segments are synchronously moved by the driving means, and the insertion hole having a size large enough to easily automatically insert the wire electrode is formed in the central portion of the guide segment assembly. After the wire electrode insertion is completed, each guide segment moves in the opposite direction, and the insertion hole is reduced until the side of each guide segment abuts the wire electrode. As a result, the wire electrode is supported by the n sides of the guide segment concentrically with the wire electrode guide central axis without any gap.

〔Example〕

FIG. 1 is an embodiment of a wire electrode guide equipped with a wire electrode guide device according to the present invention, FIG. 2 is a schematic view of a guide segment drive mechanism of the wire electrode guide of FIG. 1, and FIGS. Are diagrams showing the operating principle of the guide segment of the wire electrode guide according to the present invention, and FIGS. 6 to 8 show various examples of the drive means of the guide segment.

First, description will be made with reference to FIG. Figure 3 (A) (B)
The figure shows the basic principle of the operation of the guide segment of the wire electrode guide according to the present invention, and shows the case where the number of segments (n) is four. In FIG. 3 (A), the guide segment 1 is four right-angled isosceles triangles of the same shape, which are arranged with their bases outside with their isosceles touching each other to form a square. In other words, the guide segment 1 is a right-angled isosceles triangle obtained by dividing a square by a line connecting the center and each vertex. In the state of (A), the triangles are in close contact with each other and there is no void in the center of the square. Then, from this state, when each isosceles triangle is moved synchronously with its base coincident with the side of the original square by an equal distance, each isosceles triangle moves with its isosceles contacting each other, (B) At the center of the original square, a small square void surrounded by the isosceles of each isosceles triangle is formed. This square void expands and contracts according to the moving distance of the triangle, but its center always coincides with the original square center. Therefore, when a columnar object is inserted into this void and supported by the sides of each triangle, this columnar object is always held at the center regardless of its diameter. The above is considered on a plane, but in the case where each triangle is a prism having a thickness, the space of a regular square prism is generated in the center portion in exactly the same manner. (FIGS. 3 (c) and (d)) Now, when each of the prisms in FIG. 3 (d) is used as a guide segment and a wire electrode is inserted and held instead of the cylindrical object, the insertion hole can be enlarged / reduced. It can be used as a wire electrode guide that can be greatly expanded when it is inserted and that can always hold the wire electrode as the center regardless of the wire electrode diameter when holding the wire electrode.

Although the above description has been made for the case of n = 4, generally, in addition to n = 4, a regular n-sided polygon is generally divided into n isosceles triangles by a line connecting the center and each apex, and each of the bases has an original n If the sides of the polygon are moved synchronously so that they are in contact with each other, a regular n-square void is formed in the center, and the size thereof expands and contracts according to the movement distance, but the center is always the original positive n. Match the center of the polygon. When n = 3 in FIG. 4 (A),
(B) and (C) show cases where n = 5 and n = 6, respectively. As can be seen from the figure, when these are used as wire electrode guides, the number of supporting points of the wire electrode is equal to n, and the larger n is, the more supporting points increase, which is advantageous in securing the above-mentioned processing accuracy. Is.

The following description will be made based on the example of n = 4, but the same applies to other than n = 4. Further, in the following examples, a plane is described for easy understanding, but the same applies to a case of a solid having a thickness.

As described above, in order to accurately form a regular n-sided insertion hole in the center by moving the segments, each segment moves in the same plane, and the triangle base of each segment is the same as the original one. n Need to move along each side of each shape. In order to accurately realize this movement, it is necessary to provide a movement guide along each side of the original regular n-sided polygon and move the guide segment by an appropriate driving means described later. In this case, since the guide segment and the moving guide interfere with each other and cannot move as they are, it is necessary to delete a part of the guide segment or a part of the moving guide as shown in FIG. In FIG. 5, when the guide segment 1 slides on the moving guide 2 provided on each side of the square, both ends A of the segment are shown in FIG. Both ends B of the guide are deleted. At this time, the guide segment and the moving guide may be deleted only at one end, but there is no problem in terms of the mechanism, but the case where both ends are deleted is shown in consideration of the case where the segment is used twice. Next, the minimum and maximum values of the wire electrode diameter that can be held in this case will be considered. As shown in FIG. 5A, the minimum diameter of the insertion hole is theoretically zero. Regarding the maximum value, the dimension l ₁ (FIGS. 5A and 5B) of the deleted portion is related, and in the case of FIG. 5, the maximum wire electrode diameter that can be held is Becomes L ₁ is the length L of the triangle base of the guide segment.
Against (If you delete only one side Therefore, the maximum wire electrode diameter that can be held is Becomes In practice, even the largest wire electrode diameter used
It is about 0.3 mm, and the above-mentioned deleted length l ₁ is determined in consideration of the size of the insertion hole at the time of automatic connection.

In the above case, if l ₁ exceeds L / 4 (L / 2 if only one side is deleted), there will be an area where adjacent segments can move without touching each other, so each segment requires an independent drive means. Also, if l ₁ exceeds L / 2, a void will occur in the center even when the guide is closed, which is not practical.

Now, in the guide segment of the wire electrode guide according to the present invention, as shown in FIGS. 5C to 5E, no matter which direction the segment is moved from the guide closed state, the square insertion hole is formed in the center. The side that holds the wire electrode of each segment is different depending on the direction in which it is formed and moved. Usually, the wire guide is worn while sliding on the wire electrode while constantly applying tension to the wire electrode, and a groove is formed on the sliding surface by the wire electrode. For this reason, the wire electrode guide portion is made of sapphire or the like having high wear resistance, or sapphire or the like is used by embedding the sapphire or the like only in the sliding portion with the wire electrode in the metal body. But,
Once worn, the wire guide had to be replaced, and basically any type of wire guide could only be used once. In this respect, the wire guide according to the present invention is used, for example, in the state of FIG. 5 (D), and even when wear occurs, a position (fifth position) opposite to the guide closed position (FIG. 5 (D)).
Since the same segment can be used twice because it can be used as shown in Fig. (E), the life can be doubled as compared with the conventional wire guide. Also, since the guide segments themselves are manufactured symmetrically, if movement in both directions around the guide closed position is difficult to achieve mechanically, the same effect can be obtained by removing each guide segment and reversing the front and back and mounting. Can be obtained. The wire guide according to the invention can also be used for different wire electrode diameters,
In this case, the wire electrode is always held in the center regardless of the wire electrode diameter, but the contact position of the segment with the wire electrode moves depending on the wire electrode diameter. If so, the life can be further extended.

Next, an embodiment in which the above guide segment is incorporated in the wire electrode guide will be described with reference to FIG.

FIG. 1 shows the entire head of a wire electrode guide of a wire electric discharge machine. Here, FIG. 1 (A) is a plan view of the entire head of the wire electrode guide, and FIG. 1 (B) is a cross-sectional view taken along the line I-I of FIG. 1 (A), and FIG. 1 (C). Is the first
It is shown in a sectional view taken along line II-II in FIG. In this embodiment, the guide segment 1 is a pentagonal prism having a sectional shape in which both ends of a base 3 of an isosceles right triangle shown in FIG. 1 (D) are cut off, and as shown in FIG. 5 is held in the space of a regular quadrangular prism formed by the guide retainer 6, and the guide surface 2 formed on the inner surfaces of the base 5 and the guide retainer 6 is in contact with the side surface including the bottom side 3 to slide. Further, a resin slide plate 7 made of, for example, a tetrafluoroethylene polymer is provided on the bottom surface of the segment 1 in order to reduce sliding resistance. Also, a guide retainer 6 is attached to the upper part of the base 5,
The segment 1 is regulated to move in the horizontal direction. The guide retainer 6 is provided with a guide hole 10 through which the two pistons 8 and 9 pass, so that the pistons 8 and 9 forming a part of the drive mechanism can push the segment.
Referring now to FIG. 2, this is a schematic view showing the segment drive mechanism, and the base 5, the guide retainer 6 and the like are omitted for clarity. In the figure pistons 8, 9
Converts the rotational movement of the guide shaft 14 into a linear movement via the balls 12 and 13 attached to the operation block 11 and transmits the linear movement to the segment. That is, in the figure, when the guide shaft 14 is rotated in the direction of arrow A in the figure by a suitable driving means 4 such as an air cylinder, the operating block 11 attached to the guide shaft 14 makes a rotational movement in the direction of arrow B, and the ball 12 is The piston 8 is pushed. Piston 8 moves one of the segments in parallel along a guide (not shown). Here, since the guide segments are in contact with each other, when one segment moves along the guide, it is pushed by the other segment and the other segments also move along the guide. Therefore, the movement of the piston 8 moves all the guides in the directions of arrows C, D, E and F.
At this time, the piston 9 is pushed by the segment and follows the movement of the ball 13 to move in the direction of arrow G. By this movement, a wire electrode insertion hole with a square cross section is formed in the central portion of the wire guide, but the insertion hole is made large so as to facilitate automatic connection, and the purpose is to prevent interference with the piston 8 when the segment moves greatly. The piston 8 is provided with a notch 15. Next, after inserting the wire, in order to reduce the insertion hole and hold the wire electrode, the guide shaft 14 is rotated in the opposite direction and the piston 9 pushes the segment in the opposite direction. At this time, in order to hold the wire electrode with an appropriate holding pressure, the guide shaft 14 is provided with an appropriate clamp device 16 to lock the guide shaft at a predetermined position. In this embodiment, since the segment 1 is not moved beyond the guide closed position, the piston 9 is not provided with a notch.

Returning to FIG. 1 again, description will be made. Although FIG. 1 shows a lower head, in reality, the same one is vertically symmetrically provided on the upper part to form an upper head, and a wire electrode is stretched between them to perform electric discharge machining on a workpiece. Use it as you would. The base 5 holding the above-mentioned segment 1 is a head body
It is installed on top of 17. The head body 17 is usually a hollow block made of highly insulating ceramics, and a power supply chamber 18 is provided inside the hollow block. When used as an upper head, it may be considered that the upper and lower sides of FIG. 1 are reversed, but the wire electrode 19 is introduced into the power feeding chamber 18 from the outside through the supply hole 20 on the bottom surface of the head body 17. Inside the power feeding chamber, the wire electrodes 19 are guide blocks arranged above and below the power feeding plate 21.
It passes through the V-grooves 22 and 23, passes through the opening 24 on the top surface of the head body and the through hole 25 on the bottom surface of the base 5, and is guided to the center hole of the segment. The guide blocks 22 and 23 move in the direction of the power feeding plate 21 during operation of the wire electric discharge machine, and press the wire electrode 19 against the power feeding plate 21 with a constant force to cause the wire electrode 19 to move.
Is brought into contact with the power supply plate 21 to supply a current to the wire electrode 19. During the processing, a current flows through the wire electrode 19 to generate heat due to Joule heat, and a portion where an electric discharge is generated between the workpiece and the workpiece heats up due to the electric discharge, which may cause a wire breakage if left unattended. In order to prevent this, generally, a machining fluid with high insulation (pure water, etc.) is supplied to the wire electrode and the electrical discharge machining part to cool the wire electrode workpiece and wash away the machining powder (chip) for electrical discharge machining. Is being done. In the illustrated embodiment, the working liquid is supplied from the working liquid inlets 26, 27 on the bottom surface of the head body 17, and is filled in the power feeding chamber 18 to cool the power feeding portion, and then provided on the base 5 through the opening 24 on the upper surface of the head cover. Guide passage 6 through the machining fluid internal passage 28
Guided to the top. A head cover 29 is attached to the upper part of the base.
Fills the space formed between the wire electrode 19 and the nozzle, and is ejected from the nozzle 30 so as to surround the wire electrode 19 and is supplied to the electric discharge machining portion with the workpiece, cooling the wire electrode and the workpiece, and removing machining powder. Is done. The wire guide device shown in the figure has the same shape and is vertically symmetrical with respect to the work piece, and the wire electrodes are applied with appropriate tension from both sides to prevent the wire from vibrating due to the reaction force of the electric discharge machining. It holds and supplies the working fluid. As can be seen from the above structure, in the wire electrode guide, the center of the wire electrode insertion hole does not always move with respect to the head body 17, the power supply plate 21 and the like and is kept at a fixed position even during the opening / closing operation of the guide. Since the segment does not go out of the base 5 when moving the guide when the guide is opened and closed, a space for opening and closing such as a V-groove guide is not necessary. Further, the holding property of the wire electrode is close to that when the play is reduced by the die guide described above, and the working accuracy is improved. Furthermore, even when a large force is applied to the wire electrode, there is no concern that the wire electrode will fall out of the guide.

In the above embodiment, the method of driving the segment of the wire electrode guide is provided with one closing rod and one opening rod (piston) 8 and 9 for pushing the respective segments (Figs. 2 and 6). (A)) was taken, but there are several other possible driving methods using the same rod, for example, as shown in FIG.
A method of pulling each segment instead of pushing each segment with one opening rod is also conceivable. (FIG. 6 (B)), in which the arrow in the figure indicates the opening direction of the guide, and the rod 8 is for opening and the rod 9 is for closing. Also,
Instead of providing one rod for each opening and closing as described above, one rod 8 capable of both push and pull movements is used for both closing and opening operations (Fig. 6 (C)), reverse In addition, various modifications such as a plurality of pushing rods 8 and a plurality of pulling rods 9 each used for opening and closing (FIG. 6 (D)) can be considered. Further, in the embodiment of FIG. 1, the rotary motion of the guide shaft 14 (FIG. 2) is converted into the linear motion of the rod, but a linear actuator 37 using an air or hydraulic cylinder or the like can also be used in some cases. . In this case, if a linear actuator 37 having sufficiently high accuracy and rigidity is used, the guide around the segment can be omitted as shown in FIG. 6 (E).

It is also possible to directly drive the segment without changing the rotary motion of the guide shaft into the linear motion without converting the rotary motion into the linear motion. For example, in FIG. 7 (A), each guide segment 1 is provided with a groove 31 that forms a square recess in the central portion of the segment 1 whose sides are parallel to the guide 2 in the closed state. Further, a column 32 having a through hole at the center is fitted in the square recess and is in contact with each guide segment 1 on the side surface of each groove 31. (FIG. 7 (B)) Now, when the cylinder 32 is rotated by an appropriate means, each guide segment 1 receives a contact frictional force with the cylinder 32, moves in parallel along the guide 2, and moves to the center of the wire electrode described above. An insertion hole is formed. (FIG. 7 (C)) Each guide segment 1 is a guide 2
Due to its movement parallel to, the cylinder 32 keeps in contact with the groove 31 of the guide segment forming each side of the square regardless of the position of the guide segment. (Fig. 7 (C)) Cylinder 32
Since the center of the through hole always coincides with the wire electrode insertion hole, the wire electrode can be connected through the through hole. Further, in the above example, a rack is provided on each side of the square to ensure the drive, and a pinion that engages with the rack is provided around the cylinder to transmit the driving force by the engagement of the rack and the pinion instead of contact friction. Is also good. Further, instead of providing grooves in the guide segments as shown in FIGS. 8A and 8B, pins 33 are provided as shown in the drawing, and drive plates having grooves for engaging with the pins are cut.
By rotating 34, the same effect as the above example can be obtained. (FIG. 8 (B)) Although the driving method has been described above, in the actual device, the friction between the guide segment and the sliding portion such as the guide is reduced together with the driving method, and the guide segment can move smoothly. It is important to provide such means. In the embodiment of FIG. 1, a slide plate 7 made of a resin such as a tetrafluoroethylene polymer, which is a typical solid lubricating material, is provided between the segment and the base to reduce friction and to smoothly guide the guide segment. I am able to move. Also,
A small hole is provided on the guide surface that slides with the guide segment, and a lubricating fluid (oil, air, water) is ejected from the small hole when the guide segment moves to form a thin liquid film between the guide segment and the guide surface. There are ways to reduce friction. In this case, a machining fluid for electric discharge machining (pure water) can be used as the fluid, which is advantageous. In addition to this, for example, by applying an AC voltage to the piezo element to generate vibration, a vibration with a minute amplitude is applied to the guide or the guide segment to levitate the guide segment with respect to the guide by a slight amount. There is a method of reducing the contact friction. This method is particularly effective when used in combination with the above-mentioned lubrication method.

〔The invention's effect〕

As is clear from the above description, the wire electrode guide method and device for a wire electric discharge machine according to the present invention have the above-mentioned configuration, and therefore various effects described below can be obtained.

That is, first, the guide segment that constitutes the wire electrode guide is formed as a movable element, and the wire electrode insertion hole that can be expanded or contracted according to the moving distance can be formed. If the wire electrode insertion hole diameter is changed, the wire electrode insertion hole diameter can be easily adjusted and set to the optimum hole diameter corresponding to the changed electrode diameter. Since it is possible to remove the trouble that the wire electrode guide needs to be replaced depending on the diameter of the wire electrode, it contributes to the improvement of the machining efficiency.

In addition, the wire electrode insertion hole can be sufficiently opened to facilitate the automatic wire connection work when necessary, such as when the wire electrode is broken. Therefore, it greatly contributes to the maintenance of the wire electric discharge machine. Can be done.

Further, since the plurality of guide segments of the wire electrode guide can be moved only inside the moving guide means to expand / contract the hole diameter, the wire electrode guide can be freed from the working process step, for example, when the automatic wire connection is performed. Since it does not require a large surrounding space, it is also effective for downsizing and compacting the wire leaving machine.

Further, the wire electrode insertion hole, when holding the wire electrode,
Since it is always formed at the center of the assembly of the guide segments of the wire electrode guide, the guide is always performed at a constant center hole position regardless of the wire diameter when guiding the wire electrode. It is possible to stabilize the electric discharge machining work without intervention.

Moreover, as described above, since there are two contact points with the wire electrode on the guide segment, it is possible to use the wire electrode even twice, and due to the size of the wire electrode,
Since the contact point between the guide segment and the wire electrode changes, the wear resistance of the wire electrode guide is improved as a combined effect of the above double use and the change of the wire electrode diameter, and the service life is greatly extended. You can

Further, according to the wire electrode guide device of the present invention, since the wire electrode is supported at three or more points with no play, the feeding of the wire electrode is stable, and the wire cutting accuracy is improved. In addition to achieving the improvement, there is no risk that the wire electrode will deviate from the electrode insertion hole of the wire electrode guide even when a strong force is applied to the wire electrode, and stable machining work can be obtained, so unattended and automated wire electric discharge machining is possible. Etc. can be greatly contributed.

[Brief description of drawings]

FIG. 1 shows one embodiment of a wire electrode guide according to the present invention. FIG. 1 (A) is a plan view of the entire head of the wire electrode guide, and FIG. 1 (B) is I of FIG. 1 (A). A sectional view taken along line -I, FIG. 1C is a sectional view taken along line II-II of FIG. 1B, and FIG. 1D shows a guide segment shape of the wire electrode guide according to the present embodiment. . 2 is a schematic view of the guide segment drive mechanism of the embodiment of FIG. 1, FIG. 3 (A)
(D) shows the operation principle of the guide segment of the wire electrode guide according to the present invention when n = 4, and FIGS. 3 (A) and (B) are plan views and (C) and (D) are perspective views. , (A) to (C) of FIG. 4 show the operating principle when n = 3, 5, and 6, respectively. 5 (A) to 5 (E) are examples of changes in guide segment movement when n = 4, and FIGS. 6 (A) to 6 (E).
(E), FIGS. 7 (A) to (C), and FIGS. 8 (A) and (B) show examples of the drive means of the guide segment. 1 ... Guide segment, 2 ... Moving guide, 5 ... Base, 6 ... Guide holder, 7 ... Slide plate,
8,9 …… Piston, 10 …… Guide hole, 12,13 …… Ball,
14 ... Guide shaft, 17 ... Head body, 18 ... Power supply chamber, 19 ... Wire electrode, 20 ... Wire electrode supply hole, 24 ...
… Opening, 25 …… Base through hole, 29 …… Head cover.

Claims (5)

[Claims] 1. A method for guiding a wire electrode of a wire electric discharge machine, wherein at least one of a pair of wire electrode guides, which are spaced apart from each other on both sides of a machining part, is an integral number of three or more and has a cross section of two. The isosceles triangular guide segments are arranged so that their isosceles are adjacent to each other, and each of the guide segments is synchronously guided and moved along the base of the isosceles triangle, and the central portion of the aggregate of the guide segments is arranged. A wire electrode guide method for a wire electric discharge machine, characterized in that a wire electrode is inserted through a polygonal hole formed in the guide and guided and supported. 2. A wire electrode guide device for a wire electric discharge machine, wherein at least one of a pair of wire electrode guides, which are spaced apart from each other on both sides of the machining part, is an integral number of three or more and has a cross section of two. Wire electrode guide portions that form a polygonal wire electrode insertion hole that collects isosceles-shaped guide segments with their isosceles adjacent to each other and inserts, guides and supports the wire electrode at the center thereof, Moving guide means for guiding the guide segment so that it can be moved along the base of the isosceles triangle while keeping the isosceles in contact with each other; and each of the guide segments with a contracted position and an enlarged position of the wire electrode insertion hole. Segment drive means for moving the wire electrode insertion holes in synchronization with each other. Wire electric discharge machine of the wire electrode guide apparatus being a zoomable regulation of can. 3. The guide segment is formed by cutting off at least one of apical corners sandwiching a base of an isosceles triangle,
The wire electrode guide device of the wire electric discharge machine according to claim 2, wherein the cutout space is formed in a movement-allowed space of the guide segment. 4. The segment drive means is provided with a pinion concentric with the wire electrode insertion hole, a hole for passing a wire electrode is formed in an axis center of the pinion, and the pinion is simultaneously engaged with the pinion and has the same number as the guide segment. A rack tooth is provided on each of the guide segments in parallel with the moving guide, and the pinion is rotated to synchronously move each of the segment guides via the rack tooth.
The wire electrode guide device of the wire electric discharge machine according to. 5. The wire electric discharge machine according to claim 2, further comprising vibrating means for applying relative vibration between the guide segment and the guide surface of the moving guide means when the guide segment moves. Wire electrode guide device.