JPH09201722A - Wire guide for wire electric discharge machine - Google Patents

Abstract

(57) Abstract: A wire guide of a wire electric discharge machine is provided, which has good manufacturing workability and good wire insertability. SOLUTION: A die guide part 3 having a wire insertion hole 2 through which a wire electrode 1 is inserted, and a guide hole which is laminated on an end face of the die guide part 3 on the workpiece 4 side and gradually reduces in diameter as it approaches the die guide part 3. In a wire guide of a wire electric discharge machine having a sub guide 5 capable of guiding the wire electrode 1 into the wire insertion hole 2 by means of 50, a guide hole 50 is provided at the joining boundary portion between the sub guide 5 and the die guide portion 3. The diameter is expanded to form a storage recess 6 for an adhesive used for bonding the sub guide 5 to the die guide portion 3.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art FIG. 4 shows a conventional example of a wire guide used in a wire electric discharge machine. In this conventional example, the wire guide includes a guide holder 9 attached to the apparatus main body,
The diamond die 70 is held in the guide holder 9.
The die guide part 3 holding the inside of the sintered metal 71a and the wire electrode 1 through the wire insertion hole 2 of the diamond die 70.
It is composed of a sub guide 5 for guiding to
The die guide portion 3 and the sub guide 5 are fixed to the guide mounting recess 90 of the guide holder 9 using an adhesive.

[0003]

On the other hand, the guide hole 50 provided in the sub guide 5 guides the wire electrode 1 to the wire insertion hole 2 having a small diameter when the wire electrode 1 is automatically connected or manually connected. If there is a step or the like at the boundary with the die guide portion 3, the tip of the wire electrode 1 abuts against the step, which makes it difficult to insert the wire electrode 1.

However, in the above-mentioned conventional example, when the amount of adhesive supplied to the bonding interface between the die guide portion 3 and the sub guide 5 increases, the adhesive sticks out to the end face on the wire insertion hole 2 side and solidifies, Alternatively, since dust or the like attached at the time of solidification may become an obstacle wall when the wire electrode 1 is inserted, or the adhesive protrusion may serve as a sludge laminated substrate and grow as an obstacle wall. Has to be strictly controlled, resulting in a decrease in productivity.

The present invention has been made to solve the above-mentioned drawbacks, and an object of the present invention is to provide a wire guide for a wire electric discharge machine which has good manufacturing workability and good wire insertability.

[0006]

According to the present invention, the above-mentioned object is laminated on a die guide portion 3 having a wire insertion hole 2 through which a wire electrode 1 is inserted, and on the end surface of the die guide portion 3 on the side of the work 4. A wire guide of a wire electric discharge machine, comprising: a sub guide 5 capable of guiding the wire electrode 1 into the wire insertion hole 2 by a guide hole 50 having a diameter that gradually decreases as it approaches the die guide portion 3. The wire of the wire electric discharge machine, in which the guide hole 50 is expanded at the joint boundary portion with the portion 3 to form a storage recess 6 for an adhesive used for bonding the sub guide 5 to the die guide portion 3. Achieved by providing a guide.

As shown in FIG. 1, in a wire electric discharge machine, a pair of wire guides A, A'with a work 4 interposed therebetween.
, And the wire electrode 1 inserted through the work 4 via the wire guide A ′ on the feed side is wound by the winding means (not shown) through the wire guide A on the receiving side.
In FIG. 1, the traveling direction of the wire electrode 1 is indicated by an arrow.

In the wire guide A on the receiving side, the wire insertion hole 2 formed in the die guide portion 3 is formed by punching a super hard material such as diamond in order to prevent abrasion due to the running of the wire electrode 1. The guide hole 50 of the sub guide 5 is gradually reduced in diameter toward the die guide portion 3 so that the wire electrode 1 fed from the work 4 side is surely guided by the wire insertion hole 2 having a small diameter. It has a mortar shape.

The guide hole 50, which gradually decreases in diameter as it approaches the die guide portion 3, is shown in detail in FIG.
The diameter is increased again in the vicinity of the boundary surface with the die guide portion 3, and the storage concave portion 6 is formed in cooperation with the die guide portion 3. Here, the “reservoir concave portion” means the wire insertion hole 2 and the guide hole 50 having a diameter larger than that of the wire insertion hole 2 that is excessively supplied when the sub guide 5 is adhesively fixed on the die guide portion 3. It refers to a region in which the adhesive can be stored so as not to protrude in the center direction from the tangent line T connecting the narrowest portion. The adhesive that protrudes into the storage recess 6 is the narrowest in the guide hole 50. The ridge line portion formed in the portion does not directly come into contact with the jet water flow or the like during automatic connection as an eaves.

Therefore, in the present invention, when the sub guide 5 is joined to the die guide portion 3 by using an adhesive, the excessively supplied adhesive stays in the storage recess 6 and solidifies. Further, the protrusion from the tangent line T is reduced, and the workability of joining is improved.

Further, since the ridge line portion formed in the narrowest portion of the guide hole 50 is the eaves in the storage recess 6, the adhesion of dust when the adhesive is solidified or the accumulation of sludge is reduced.

Note that "the guide hole 50 allows the wire electrode 1
Is a sub guide 5 that can guide the wire into the wire insertion hole 2.
Wire electrode 1 passes through sub guide 5 and wire insertion hole 2
Is used, that is, a state in which the wire electrode 1 can be guided when used as the receiving side wire guide A, and is not excluded when used as the sending side wire guide A ′.

The die guide portion 3 is formed by fixing diamond or the like for punching the wire insertion hole 2 at a predetermined position by an appropriate auxiliary material. For example, the structure shown as the conventional example can be used as it is. According to the second aspect of the invention, a wire guide having good assembly workability is proposed.

That is, in the present invention, the die guide portion 3 includes a guide body 7 in which a peripheral edge of the diamond die 70 having the wire insertion hole 2 formed therein is held by a support body 71.
The guide body 7 is sandwiched in cooperation with the sub-guide 5, and a guide hole 80 capable of guiding the wire electrode 1 which travels to the work 4 side by gradually reducing the diameter toward the work body 7 is provided in the wire insertion hole 2. And a guide hole 80 at the joint boundary portion between the support guide 8 and the guide body 7.
Is expanded to form an adhesive storage recess 6'used for bonding the support guide 8 to the guide body 7.

The die guide portion 3 holds the peripheral edge of the diamond die 70 with a support 71 to form a plate-shaped guide body 7 and a support guide 8 having a guide hole 80 separately, and then, for example, a guide. It can be manufactured by sequentially stacking in the holder 9.

As shown in FIG. 4, it is necessary to hold the diamond die 70 by accurately aligning the wire insertion hole 2 with the guide hole 80 in a sintered metal having a guide hole 80 and having a complicated shape. Compared with the conventional example, in the present invention, the dimensional control is easy because it can be formed of the same material as the guide body 7 whose dimensional control is relatively easy only by holding the peripheral edge of the diamond die 70 with the support 71. Since the support guides 8 are separately formed, it is possible to expect an improvement in yield and the like, and the support guides 8 can be diverted to the sub guides 5 as they are, so that the number of parts does not increase.

In the third aspect of the invention, a structure with less wire breakage is proposed. That is, the guide hole 50,
The wall surface of the narrowest part of 80 is chamfered to prevent the knife edge from being generated in the wire insertion path, and to prevent the wire from breaking or the edge part from being damaged.

[0018]

1 and 2 show a wire guide according to the present invention. Reference numeral 9 in the figure denotes a pipe-shaped guide holder that is mounted on the apparatus body side (not shown), and is made of stainless steel or the like. The guide holder 9 has a guide mounting recess 90 at its tip, and the die guide portion 3 and the sub guide 5 are fixed in the guide mounting recess 90.

The die guide portion 3 has a guide mounting recess 90.
It is formed by stacking a support guide 8 and a guide body 7 inside, and the guide body 7 is composed of a sintered metal 71a and a ring body 71b on the outer periphery of a diamond die 70 having a wire insertion hole 2 formed in the center thereof. It is formed by being held by the support 71.

In the guide body 7, a diamond piece to be the diamond die 70 is arranged at the center of the ring body 71b, and then sintered metal powder is filled in the gap and fired.
Further, it is manufactured by forming a wire insertion hole 2 at the center of the diamond piece with the outer periphery of the ring body as a reference.

In the above, the guide body 7 has a structure in which the sintered metal 71a is used to fix the diamond die 70 in the center of the ring body 71b, but the structure of the guide body 7 is not limited to this. It is also possible to use silver solder instead of the metal 71a, or to fix the diamond die 70 by caulking directly to the ring body 71b.

On the other hand, the sub-guide 5 is made of a hard material such as stainless steel, sapphire, ruby, ceramics or the like. Desirably, a non-conductive material such as sapphire, ruby, ceramics or the like is used to prevent electric erosion due to the working liquid. used.

Reference numeral 50 denotes a guide hole formed in the center of the sub guide 5, which has a funnel shape in which the diameter gradually decreases from the upper end to the lower end. The guide hole 50 is expanded again in the vicinity of the contact surface with the guide body 7, and the upper part of the guide body 7 has a boundary between the wall surface on the diameter reduction side and the wall surface on the diameter expansion side as an eaves. The storage recess 6 is formed. Further, a round chamfer 60 is formed on the boundary between the wall surface on the diameter reduction side and the wall surface on the diameter expansion side to prevent the formation of an edge ridge.

Further, the support guide 8 is made of a hard material such as stainless steel, sapphire, ruby, ceramics, etc., and like the sub guide 5, the guide hole 80 is provided.
And a storage recess 6 '. The guide hole 80 in the support guide 8 is effective for guiding the wire electrode 1 into the wire insertion hole 2 of the guide body 7 when mainly used as the feed side wire guide A ′, and is used as a sub guide as the support guide 8. The guide 5 can be diverted as it is.

Therefore, in the present embodiment, the wire guide is provided in the guide mounting recess 90 of the guide holder 9,
The support guide 8, the guide body 7, and the sub guide 5 can be manufactured by simply stacking and fixing them using an adhesive in this order, and the excess supplied adhesive is stored in the storage recesses 6 and 6 '. Therefore, there is no possibility that the wire electrode 1 is unintentionally protruded to the center and hinders the insertion work of the wire electrode 1.

The guide holes 50, 80 and the chamfered portion 60
Further, the shape of the storage recess 6 is not limited to that shown in the drawings. For example, the guide holes 50 and 80 may be formed in the shape of a conical body having a straight generatrix or a curved conical body having a generatrix shown in FIG. As shown in (a), the chamfered portion is not a rounded surface but a linear rising surface 60 ′, and further, as shown in FIG.
It is also possible to make a step.

The sub guide 5 and the support guide 8 may have different shapes, and the support guide 8 may be formed in exactly the same manner as that shown in the conventional example.

[0028]

As is apparent from the above description, according to the present invention, not only the manufacturing efficiency can be improved, but also the wire electrode insertability can be improved.

[Brief description of drawings]

FIG. 1 is a diagram showing the present invention.

FIG. 2 is an enlarged view of a main part of FIG.

FIG. 3 is a diagram showing a modified example of the present invention.

FIG. 4 is a diagram showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Wire electrode 2 Wire insertion hole 3 Dice guide part 4 Work piece 5 Sub guide 50 Guide hole 6, 6'Recessed recess 7 Guide body 70 Diamond die 71 Support body 8 Support guide 80 Guide hole

Claims (3)

[Claims] Claim: What is claimed is: 1. A wire guide comprising: a die guide portion having a wire insertion hole through which a wire electrode is inserted; and a guide hole that is laminated on a work-side end surface of the die guide portion and gradually reduces in diameter as it approaches the die guide portion. In a wire guide of a wire electric discharge machine having a sub-guide which can be guided in an insertion hole, in a bonding boundary part between the sub-guide and the die guide part,
A wire guide for a wire electric discharge machine in which a guide hole is expanded to form a storage recess for an adhesive used for bonding a sub guide to a die guide section. 2. The die guide part holds a guide body in cooperation with the sub-guide, the guide body holding a peripheral edge of a diamond die having a wire insertion hole formed therein by a support body, and the guide body being sandwiched between the guide body and the guide body. And a support guide having a guide hole capable of guiding the wire electrode, which is gradually reduced in diameter as it approaches the work side, into the wire insertion hole, and at the joint boundary portion between the support guide and the guide body,
The wire guide for a wire electric discharge machine according to claim 1, wherein the guide hole is expanded in diameter to form a storage recess for an adhesive used for bonding the support guide to the guide body. 3. A wire guide for a wire electric discharge machine according to claim 1, wherein the narrowest wall surface of the guide hole is chamfered.