JPH02205414A - Method for guiding wire electric pole of wire electric discharging machine and device therefor - Google Patents

Abstract

PURPOSE:To widen, smallen and adjust a hole for inserting an electric pole formed at the center of a segment aggregate by constructing an electric pole guide by an integral number, over three, of segments which are isosceles triangle in section and moving each segment along its base. CONSTITUTION:A wire electric pole guide is divided into four guide segments 1, each segment 1 has a same shape of an isosceles right triangle the base 3 of which is toward the outside, those equal sides are mated with each other and an arranged square is formed thereby. A guide shaft 14 is rotated in an A-direction to rotate an operating block 11 in a B-direction, a piston 8 is pressed by a ball 12 and one of the segments 1 is parallelly moved along the guide. The respectived guides 1 are face-contacted with each other so that all of the guides are moved in the directions of arrows C, D, E, F due to the motion of the piston 8. At this time, a piston 9 is pressed by the segments to be moved in a G-direction. An inserting hole which is square in section is formed at the center of the guide due to this motion. Consequently, the inserting hole is widened and smallened according to the press-moving amount.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a wire main electrical discharge machine, and in particular, a workpiece and a wire electrode are spaced apart above and below an electrical discharge machining section facing each other through a minute gap. In a pair of wire electrode guides, the wire electrode insertion hole of the wire electrode guide part that guides and supports the wire electrode in a certain path can be adjusted to expand or contract according to the size of the wire electrode diameter, and can be used for automatic wire connection, etc. The present invention relates to a method and device for guiding a wire electrode in a wire electrical discharge machine, which can be freely expanded when required, and can properly and easily insert and guide a wire electrode.

[Conventional technology]

In general, a wire electrical discharge machine places a workpiece and a wire electrode facing each other with a small gap in between, and energizes both to generate an electric discharge in the small gap, while also moving the workpiece and wire electrode relatively. The workpiece is then machined using the energy of the electric discharge. The wire electrode is constantly sent from its storage reel through the electrical discharge machining section facing the workpiece to a wire electrode winding roller or a wire electrode collection box to prevent wire breakage accidents due to electrode wear during electrical discharge. is taken. In addition, conventional wire electric discharge machines have wire electrode guides installed above and below the electric discharge machining section, and these two wire electrode guides constitute a wire electrode guide device that guides the wire electrode in the vertical direction. A configuration is adopted in which the accuracy of electrical discharge machining is maintained by maintaining the facing arrangement between the object and the wire electrode in a constant state with a minute gap interposed therebetween. The wire electrode guide also has means for supplying cooling water to the wire electrode and machining fluid to the electrical discharge machining section, thereby stabilizing electrical discharge machining.

However, it is difficult to completely avoid wire breakage accidents in the electrical discharge machining section due to fluctuations in electrical discharge energy, non-uniformity in the wire diameter of the wire electrode, and the like. For this reason, it is common to have an automatic wire connection structure that allows a new wire to be guided and inserted by temporarily expanding the wire electrode passage of the wire electrode guide when a disconnection accident occurs, so-called automatic loading. is provided as an essential structure. Also,
The wire electrode guide must support the wire electrode accurately so as to always apply a constant tension to the wire electrode in order to suppress the vibration of the wire electrode due to discharge repulsion force, etc. as much as possible. must meet strict requirements in terms of accuracy and wire electrode support strength.

And, in the wire electrode guide part of the wire electrode guide,
Two types of guides are used: split guides called split guides and non-split guides. Here, the split type guide is a method in which a wire electrode is sandwiched, pressed and supported between two or more divided guides, and a groove guide is a typical example. A die guide is a non-dividable guide 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 through the through hole.

The above two types of guides have the characteristics shown below, and are used depending on each case.

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 groove, and a push plate presses the wire electrode into the groove.
Since the wire electrode is pressed against the surface and is securely supported at three points, it is possible to eliminate play in the wire electrode holding portion that adversely affects processing accuracy.

(2) The greatest feature of the groove guide is that by separating the V-groove forming surface of the guide and the push plate, the wire electrode passage can be expanded and the automatic wire connection described above can be easily performed.

(2) An automatic wire connection mechanism using a groove guide is disclosed in Japanese Patent Publication No. 61-54530 filed by the present applicant.

As mentioned above, although the V-groove guide is very advantageous in terms of automatic wire connection, it does have some problems. There is a problem that the support point moves between three points depending on the direction of the reaction force, and when machining round objects, the shape of the workpiece deviates from a perfect circle and tends to become a triangle (rice ball shape). There are problems such as the wire electrode falling off from the guide when a strong force is applied, and the problem that the opening/closing mechanism for automatic wire connection requires a relatively large space and the distance between the upper and lower wire electrode guides becomes large.

On the other hand, the die guide does not sandwich the wire electrode like a V-groove guide (it has a structure in which the wire electrode is inserted through a hole provided in the guide, so there is no problem with the wire electrode falling off).
In addition, since the guide does not open or close, no space is 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 wire connection, and the insertion hole diameter needs to be larger than the wire electrode diameter, and this play reduces processing accuracy.
It has the following problems. In order to solve some of the above-mentioned problems with die guides, recently some die guides have been divided into two parts and opened and closed, which is advantageous when automatically connecting wires. In order to eliminate misalignment of the insertion hole, strict requirements are placed on the processing accuracy of the guide and the accuracy of the opening/closing mechanism, making it difficult to manufacture.

(Problems to be Solved by the Invention) As described above, in the conventional wire electrode guide, it is theoretically extremely difficult to simultaneously satisfy the requirements regarding automatic wire 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 that eliminates these problems of conventional groove guides and die guides.

That is, an object of the present invention is to have a good automatic wire connection structure that can greatly expand the wire electrode passage during automatic wire connection, and to provide multi-point support for the wire electrode at three or more points without play or wobbling in order to obtain processing accuracy. An object of the present invention is to provide a wire electrode guiding method and device that can perform the following steps.

[Means to solve the problem]

In order to solve the above problems, according to the present invention, an integer (n) of guide segments of three or more are collectively arranged, and a wire electrode is inserted into a polygonal wire electrode insertion hole formed in the center of the guide segments. A wire electrode guiding method and a wire electrode guiding device are provided.

Specifically, the wire electrode guiding method for a wire electric discharge machine is such that at least one of a pair of wire electrode guides arranged at a distance on both sides of a machining section is an integer of three or more and has an isosceles cross section. Triangular guide segments are arranged in a cluster with their isosceles sides adjacent to each other, and each of the guide segments is guided and moved synchronously along the base of the isosceles triangular shape, and the guide segments are guided to the center of the collection of guide segments. A wire electrode guiding method for a wire electric discharge machine is provided, which comprises inserting a wire electrode into a polygonal hole to be formed, guiding and supporting the wire electrode. Further, in the wire electrode guide device of the wire electric discharge machine, at least one of the pair of wire electrode guides arranged apart from each other on both sides of the machining section has an integer number of three or more and has an isosceles triangular cross section. a wire electrode guide part that forms a polygonal wire electrode insertion hole in which the guide segments are assembled with their isosceles adjacent to each other, and the wire electrode is inserted through the center of the guide segment to guide and support the guide segments; a moving guide means for guiding the isosceles portions so as to be movable along the base of the isosceles triangular shape while keeping them in contact with each other, and moving each guide segment between a contracted position and an expanded position of the wire electrode insertion hole. a segment driving means for synchronously moving the wire electrode, and the wire electrode insertion hole is capable of adjusting the size of the hole according to the amount of movement of each guide segment. A wire electrode guide device for a processing machine is provided.

[For production]

By configuring as described above, automatic wiring execution 118
In this step, each guide segment is moved synchronously by the driving means, and an insertion hole large enough to easily and automatically insert the wire electrode is formed in the center of the guide segment assembly. The segments are moved in the opposite direction to reduce the through hole 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 center axis without any gaps.

〔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 diagram of a guide segment drive mechanism of the wire electrode guide of FIG. 1, and FIGS. 3 to 5 1 is a diagram 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 drive means for the guide segment.

First, explanation will be given with reference to FIG. Figure 3 (A) (B)
1 is a diagram showing the basic principle of operation of the guide segments of the wire electrode guide according to the present invention, and shows a case where the number of segments (n) is four. In FIG. 3(A), the guide segments 1 are four right-angled isosceles triangles of the same shape, which are arranged with their bases facing outward and isosceles to each other, forming a square. In other words, the guide segment 1 is a right isosceles triangle formed by dividing a square by lines connecting its center and each vertex. In state (A), the triangles are in close contact with each other and there is no void in the center of the square. Next, from this state, if each isosceles triangle is moved synchronously by an equal distance while keeping its base aligned with the side of the original square, each isosceles triangle will move with its isosceles touching each other, and (B) As shown in , a small square void surrounded by the isosceles of each isosceles triangle is formed at the center of the original square. This square gap expands and contracts depending on the distance the triangle moves, but its center always coincides with the original square center. Therefore, if a cylindrical object is inserted into this gap and supported by the sides of each triangle, the cylindrical object will always be held at the center regardless of its diameter. The above was considered on a plane, but in the case where each triangle is a prism with a thickness, a square prism space is generated in the center in exactly the same way. (Fig. 3(c)(d)) Now, if 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 and contracted and the wire It can be greatly expanded during insertion, and can also be used as a wire electrode guide that can always hold the wire electrode at the center regardless of the wire electrode diameter.

The above explanation is based on the case of n-4, but in cases other than n = 4, in general, n isosceles triangles are created by dividing a regular n-gon by a line connecting its center and each vertex. When the sides of a square are moved in synchronization so that they touch each other, a gap of a regular n-gon is formed at the center, and its size expands or contracts depending on the distance traveled, but the center is always the same as the original square n. coincides with the center of the rectangle. In the case of n=3 in Fig. 4 (A), (B
) (C) with n=5. The case where n=6 is shown.

As can be seen from the figure, when these are used as wire electrode guides, the number of support points of the wire electrode is equal to n, and as n increases, the number of support points also increases. It's advantageous.

Although the following explanation will be based on an example in which n=4, the same holds true for cases other than n=4.

Further, in the following embodiments, a plane will be explained for easy understanding, but the same applies to a three-dimensional structure having a thickness.

Now, in order to accurately form a regular n-gonal insertion hole in the center by moving the segments as described above, each segment must move on the same plane, and the triangular base of each segment must be aligned with the original n It is necessary to move along each side of each shape. In order to realize this movement with high precision, it is necessary to provide a movement guide along each side of the original regular n-gon and move the guide segment using an appropriate driving means, which will be described later. In this case, the guide segment and the moving guide will interfere with each other and movement will not be possible, so it is necessary to delete part of the guide segment or part of the moving guide as shown in FIG. 5. In Fig. 5, when the guide segment 1 slides on the moving guides 2 provided on each side of the square, in order to avoid interference, Fig. 5 (A) shows both ends A of the segment, and Fig. 5 (B) shows each of the segments. Both ends B of the guide are removed. At this time, although there is no mechanical problem if the guide segment and the moving guide are deleted only at one end, the case where both ends are deleted is shown in consideration of the case where the segment is used twice, which will be described later. Next, consider the minimum and maximum values of the wire electrode diameter that can be maintained in this case.

As shown in FIG. 5(A), the minimum diameter of the insertion hole is theoretically zero. Also, regarding the maximum value, the dimension At of the deleted portion
(Fig. 5 (A) and (B)) are related, and in the case of Fig. 5, the maximum wire electrode diameter that can be maintained is flL. Also, tal is 2. <-(2 if only one side is deleted, <
-), so the maximum wire electrode diameter that can be held is L. In reality, the diameter of the wire electrode used is at most about 0.3 mm, and the above-mentioned removed length 11 is determined in consideration of the size of the insertion hole for automatic wire connection.

If it exceeds -, there will be a region where adjacent segments move without touching each other, so each segment will need an independent driving means, and if it exceeds -, a gap will be created in the center even when the guide is closed. It's not practical.

Now, as shown in FIGS. 5(C) to 5(E), the guide segment of the wire electrode guide according to the present invention has a square insertion hole in the center no matter which direction the segment is moved from the guide closed state. The sides that hold the wire electrode of each segment have different characteristics depending on the direction in which they are moved. Normally, a wire guide always slides on the wire electrode while applying tension to the wire electrode, which causes wear. A groove will be dug in the moving surface. 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 embedded in the metal body only at the sliding portion with the wire electrode. However, −
Once a wire guide has worn out, it must be replaced, and basically any type of wire guide can only be used once. In this respect, the wire guide according to the present invention is shown in FIG.
) Even if wear occurs due to use in the guide closed position (Fig. 5 (D)), the position opposite to the guide closed position (Fig.
E)), so the same segment can be used as
It can be used twice as long as conventional wire guides. In addition, the guide segments themselves are manufactured symmetrically, so if it is mechanically difficult to move in both directions around the guide closed position, you can achieve the same effect by removing each guide segment and installing it upside down. can be obtained. Furthermore, the wire guide according to the present invention can be used for different wire electrode diameters, in which 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 is Since the wire moves depending on the diameter, if the wire diameter is changed in addition to the above-mentioned two-time use, the life can be further extended.

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

FIG. 1 shows the entire head of a wire electrode guide for a wire electrical discharge machine. Here, FIG. 1(A) is a plan view of the entire head of the wire electrode guide, FIG. 1(B) is a cross-sectional view taken along the line I-I of FIG. 1(A), and FIG. 1(C) is a plan view of the entire head of the wire electrode guide. is the first
This is a cross-sectional view taken along the line ■-■ in Figure (B). In this embodiment, the guide segment 1 is a pentagonal prism having a cross-sectional shape obtained by cutting off both ends of the base 3 of a right-angled isosceles triangle as shown in FIG. 1(I), and as shown in FIG. 1(C), It is held in a regular square prism space formed by the base 5 and the guide holder 6, and slides with the side surface including the base 3 in contact with the guide surface 2 formed on the inner surface of the base 5 and the guide holder 6. . Furthermore, a resin slide plate 7 made of, for example, tetrafluoroethylene polymer is provided on the bottom surface of the segment 1 in order to reduce sliding resistance. Further, a guide presser 6 is attached to the upper part of the base 5 to restrict the movement of the segment 1 in the horizontal direction.

The guide holder 6 is provided with a guide hole 10 through which two pistons 8.9 pass, allowing these pistons 8.9, which form part of the drive mechanism, to push the segments. Referring now to FIG. 2, this figure is a schematic diagram showing the segment drive mechanism, and the base 5, guide presser 6, etc. are omitted for clarity. In the figure, piston 8
゜9 is a ball 12 attached to the actuation block 11;
13, the rotational motion of the guide shaft 14 is converted into linear motion and transmitted to the segments. That is, when the guide shaft 14 in the figure is rotated in the direction of arrow A in the figure by an appropriate driving means 4 such as an air cylinder, the actuating block 11 attached to the guide shaft 14 rotates in the direction of arrow B, and the ball 12
pushes the piston 8. Piston 8 is segment 1
one in parallel along a guide (not shown). Here, each guide segment is in contact with each other, so 1
When one segment moves along the guide, it pushes the other segments along the guide.

Therefore, the movement of the piston 8 moves all the guides along the arrows C, D, and E.
, move in the direction of F. At this time, the piston 9 is pushed by the segment and moves in the direction of arrow G following the movement of the ball 13. Due to this movement, a wire electrode insertion hole with a square cross section is formed in the center of the wire guide. The piston 8 is provided with a notch 15 to prevent the segment from interfering with the piston 8 when it moves a large distance in order to make the insertion hole large for easy wire connection. To reduce the size and hold the wire electrode, the guide shaft 14 is rotated in the opposite direction to the above, and the piston 9 is used to push 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
A lamp device 16 is provided as appropriate, and the structure is such that the guide shaft is locked at a predetermined position.

In this embodiment, the piston 9 is not provided with a notch because the segment 1 is not moved beyond the guide closed position.

Returning to FIG. 1 again, explanation will be given. Figure 1 shows the lower head, but in reality, the same thing is installed symmetrically on the upper part, forming the upper head, and a wire electrode is stretched between them to perform electrical discharge machining on the workpiece. It is used as such. A base 5 holding the above-mentioned segment 1 is installed on the helad body 1f. The head body 17 is usually
It is a hollow block made of highly insulating ceramics, and a power supply chamber 18 is provided inside the block. When used as an upper head, the wire electrode 19 can be turned upside down in FIG. 1, and the outside of the wire electrode 19 is introduced into the power supply chamber 18 through a supply hole 20 on the bottom surface of the head body 1. Inside the power supply chamber, the wire electrode 19 passes through the V-grooves of the guide plotters 22 and 23 arranged above and below the power supply plate 21, passes through the opening 24 on the top surface of the rad body and the through hole 25 on the bottom surface of the base 5, and passes through the segment center hole. guided by. The guide blocks 22 and 23 move in the direction of the power supply plate 21 during operation of the wire electrical discharge machine, and press the wire electrode 19 against the power supply plate 21 with a constant force, thereby moving the wire electrode 19 to the power supply plate 21.
1 to supply current to the wire electrode 19.

During machining, current flows through the wire electrode 19 and generates heat due to Joule heat, and the portion where electrical discharge occurs between the wire electrode 19 and the workpiece generates heat due to the electrical discharge, and if left unattended, it may cause wire breakage. To prevent this, generally a highly insulating machining fluid (such as pure water) is supplied to the wire electrode and the electrical discharge machining section to cool the wire electrode fluid workpiece and wash away the machining powder (chips) from the electrical discharge machining. In the embodiment shown in Fig. 0, in which processing fluid is supplied from the processing fluid inlets 26 and 27 on the bottom of the helad body 17, the power supply chamber is filled within one day and the power supply section is cooled. The machining liquid is guided from the opening 24 on the top surface of the helad cover to the upper part of the guide presser 6 through an internal passage 28 provided in the base 5 . A head cover 29 is attached to the upper part of the base, and the machining liquid fills the space formed between the head cover 29 and the guide holder 6, and is ejected from the nozzle 30 so as to surround the wire electrode 19. It is supplied to the electrical discharge machining part between the workpiece and the wire electrode and the workpiece to be cooled and machining powder is removed. In the wire guide device shown in the figure, devices of the same shape are arranged vertically symmetrically with the workpiece sandwiched between them, and the wire electrodes are held under appropriate tension from both sides to prevent the wire from vibrating due to the reaction force of electrical discharge machining. In addition to holding it, processing fluid is also supplied.

As can be seen from the above structure, in this wire electrode guide, the center of the wire electrode insertion hole is always kept at a constant position without moving relative to the head body 17, the power supply plate 21, etc. even during the opening/closing operation of the guide. . When the guide opens and closes, the segments do not move out of the base 5, so there is no need for a space for opening and closing, such as a groove guide.

Furthermore, the holding characteristics of the wire electrode are close to those obtained when the play is reduced using the die guide described above (and the machining accuracy is improved).

Furthermore, even if a large force is applied to the wire electrode, there is no fear that the wire electrode will fall off from the guide.

Now, in the above embodiment, the method for driving the segments of the wire electrode guide includes one rod (piston) 8.9 for closing and one for opening, and a structure for pushing each segment (Figs. 2 and 6). (A)), but there are several other driving methods using similar rods. For example, as shown in Figure 6 (B), one for closing and one for opening fixed to the segment. It is also conceivable to use rods to pull the segments instead of pushing them. (Figure 6 (B
)), where the arrow in the figure represents the opening direction of the guide, with rod 8 for opening and rod 9 for closing. In addition, instead of providing one rod for opening and closing as described above, one rod 8 that can move in both pushing and pulling directions is used for both closing and opening operations (Fig. 6 (C)). On the contrary, various examples of variations are conceivable, such as one in which a plurality of pushing rods 8 and a plurality of pulling rods 9 are used for opening and closing (FIG. 6(D)). Furthermore, in the embodiment shown in Fig. 1, the rotational movement of the guide shaft 14 (Fig. 2) is converted into linear movement of the rod, but a direct-acting actuator 37 using an air or hydraulic cylinder may also be used depending on the case. be. In this case, if a linear actuator 37 with sufficiently high precision and rigidity is used, it is possible to omit the guide around the segment as shown in FIG. 6(E).

It is also possible to directly drive the segments in rotational motion without converting the rotational motion of the guide shaft into linear motion. For example, in FIG. 7(A), each guide segment l is A groove 31 forming a square recess parallel to the guide 2 in the center of the segment 1 is provided. Further, a cylinder 32 having a through hole in the center is fitted into the square recess to connect each guide segment l and each groove 3.
They touch on one side. (FIG. 7(B)) Now, when the cylinder 32 is rotated by an appropriate means, each guide segment l receives a contact friction force with the cylinder 32, moves in parallel along the guide 2, and places the aforementioned wire electrode in the center. Form an insertion hole. (7th
(C)) Since each guide segment l moves parallel to the guide 2, the cylinder 32 remains in contact with the groove 31 of the guide segment forming each side of the square, shape, regardless of the position of the guide segment. (FIG. 7(C)) Since the center of the through hole of the cylinder 32 always coincides with the wire electrode insertion hole,
It is possible to connect a wire electrode through this through hole. In addition, in the above example, in order to ensure the drive, a rack is provided on each side of the square, and a pinion that meshes with the rack is provided around the cylinder, so that the driving force is transmitted by meshing the rack and pinion instead of contact friction. Also good.

Furthermore, instead of providing grooves in the guide segments as shown in FIGS. 8(A) and 8(B), bins 33 are provided as shown in the figures, and the drive plate 3 is provided with grooves that engage with the bins.
By rotating 4, the same effect as in the above example can be obtained. (Fig. 8 (B)) The driving method has been explained above, but in an actual device, the friction between the guide segment and the sliding part such as the guide is reduced in addition to the driving method, so that the guide segment can move smoothly. It is important to provide such means. In the embodiment shown in Fig. 1, a slide plate 7 made of resin such as 47-fluorinated tyrene polymer, which is a typical solid lubricant material, is provided between the segment and the base to reduce friction and ensure that the guide segment moves smoothly. It allows you to move.

In addition, a small hole is provided on the guide surface that slides with the guide segment, and lubricating fluid (
There is a method to reduce friction by jetting out liquid (oil, air, water), etc. to form a thin liquid film between the guide segment and the guide surface. In this case, it is advantageous that a machining fluid for electrical discharge machining (pure water) can be used as the fluid. In addition to this, it is also possible to apply minute amplitude vibrations to the guide or guide segment by, for example, applying an AC voltage to a piezo element to generate vibrations, so that the guide segment levitates a minute amount relative to the guide during movement. There is a method to reduce contact friction by This method is particularly effective when used in combination with the lubrication method described above.

〔Effect of the invention〕

As is clear from the above description, since the wire electrode guiding method and device for a wire electric discharge machine according to the present invention has the above-described configuration, it is possible to obtain various effects described below.

That is, first, the guide segments constituting the wire electrode guide were formed as movable elements, and since it was possible to form a wire electrode insertion hole that could be expanded or contracted according to the moving distance, the wire electrode diameter was set as an electric discharge machining condition. When the wire electrode insertion hole diameter is changed, the diameter of the wire electrode insertion hole can be easily adjusted and set to the optimum hole diameter corresponding to the changed electrode diameter, which not only significantly improves the machining capacity of the wire electric discharge machine, but also This eliminates the hassle of having to replace the wire electrode guide depending on the diameter of the wire electrode, which also contributes to improving processing efficiency.

In addition, when necessary, such as when the wire electrode breaks, the wire electrode insertion hole can be expanded sufficiently to facilitate automatic wire connection work, and therefore greatly contributes to improving the maintainability of the wire electrical discharge machine. It is possible.

Furthermore, since the plurality of guide segments of the wire electrode guide can be moved only within the moving guide means to expand and contract the hole diameter, it is possible to free the wire electrode guide from the machining process and, for example, to perform automatic wire connection. This method does not require a large amount of surrounding space, and is therefore effective in making the body of a wire processing machine smaller and more compact.

In addition, the wire electrode insertion hole is used when holding the wire electrode.
Since it is always formed at the center of the assembly of guide segments of the wire electrode guide, the wire electrode is always guided at a constant center hole position regardless of the wire diameter, making it easier for the operator to perform adjustment work, etc. This makes it possible to stabilize electrical discharge machining operations without requiring intervention.

Moreover, as mentioned above, since there are two contact points with the wire electrode on the guide segment, it is possible to use the wire electrode twice, and depending on the diameter of the wire electrode,
Since the contact point between the guide segment and the wire electrode changes, the combined effect of the above-mentioned double use and changing the wire electrode diameter improves the wear resistance of the wire electrode guide and significantly extends its service life. Can be done.

Further, according to the wire electrode guide device of the present invention, the wire electrode is supported at three or more points without play, so that the wire electrode can be fed stably and the wire cutting accuracy can be improved. In addition to this, even if a strong force is applied to the wire electrode, there is no risk that the wire electrode will deviate from the electrode insertion hole of the wire electrode guide, and the machining work can be stabilized, making wire electrical discharge machining unmanned and automated. etc., can also make a significant contribution.

[Brief explanation of the drawing]

FIG. 1 shows one embodiment of the 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 the I of FIG. -1 line, FIG. 1(C) is a cross-sectional view taken along line -■ in FIG. 1(B), and FIG. 1(D) shows the guide segment shape of the wire electrode guide according to this embodiment. , FIG. 2 is a schematic diagram of the guide segment drive mechanism of the embodiment shown in FIG. 1, and FIG. 3(A)
- (D) are diagrams of the operating principle of the guide segment of the wire electrode guide according to the present invention, and show the case where n = 4, and Fig. 3 (A
) (B) is a plan view, (C) (D) is a perspective view, Fig. 4 (A
) to (C) each show the operating principle when n=3.5.6. Furthermore, FIGS. 5(A) to (E) show examples of changes in guide segment movement when n=4, and FIGS. 6(A) to (E)
E), FIGS. 7(A) to 7(C), and FIGS. 8(A) and 8(B) show examples of drive means for guide segments.

Claims (1)

[Claims] 1. A wire electrode guiding method for a wire electrical discharge machine, comprising:
At least one of the pair of wire electrode guides spaced apart from each other on both sides of the processing section includes guide segments having an integer number of three or more and having an isosceles triangular shape in cross section and are arranged in groups with their isosceles adjacent to each other. , synchronously guiding and moving each of the guide segments along the base of the isosceles triangular shape, and guiding a wire electrode by inserting it into a polygonal hole formed in the center of the assembly of the guide segments; A method for guiding a wire electrode in a wire electrical discharge machine, characterized by supporting the wire electrode. 2. A wire electrode guide device for a wire electrical discharge machine,
At least one of the pair of wire electrode guides spaced apart from each other on both sides of the processing section includes an integer number of three or more guide segments each having an isosceles triangular cross section, with their isosceles sides adjacent to each other; a wire electrode guide part forming a polygonal wire electrode insertion hole in the center of which the wire electrode is inserted, guided and supported; comprising: a movement guide means for guiding the guide segments so as to be movable along the bottom; and a segment drive means for synchronously moving each guide segment between a contracted position and an enlarged position of the wire electrode insertion hole; A wire electrode guide device for a wire electrical discharge machine, wherein the size of the wire electrode insertion hole can be adjusted in size depending on the amount of movement of each guide segment. 3. The wire electrical discharge machining according to claim 2, wherein the guide segment has at least one of its apex corners sandwiching the base of an isosceles triangle cut off, and the cutout space is formed as a movement-permitting space of the guide segment. Machine wire electrode guide device. 4. The segment driving means includes a pinion provided concentrically with the wire electrode insertion hole, a hole through which the wire electrode is passed in the axis of the pinion, and rack teeth of the same number as the guide segment that mesh with the pinion at the same time. The wire electrical discharge machine according to claim 2 or 3, wherein the wire electrical discharge machine is provided in each of the guide segments in parallel with the moving guide, and is configured to rotate the pinion and move each of the segment guides synchronously via the rack teeth. Wire electrode guide device. 5. The wire electrode of the wire electric discharge machine according to claim 2, further comprising a vibrating means for applying relative vibration between the guide segment and the guide surface of the moving guide means when the guide segment is moved. Guidance device.