JPH03166015A - Wire saw - Google Patents

Abstract

PURPOSE:To ensure the long life of a wire saw and enhance the cutting efficiency of the saw by providing a sphere portion at one end of a segment and a sphere hole at the other end on the same axis, and fixing a tubular chip of grinding power layer around the outer periphery of each of numerous segments, and connecting the segments together by means of insertion of the sphere portion of one segment into the sphere hole of adjacent segment. CONSTITUTION:A connecting tube 2 has female screws 7 formed at both ends of its inner face and a chip 3 of grinding powder layer comprising super grinding powder fixed together by a binding agent is fixed to the connecting tube 2 by an adhesive etc. A male member 5 has a male screw 9 formed at one end thereof and a sphere portion 11 formed via a neck portion 10 at the other end, and a female member 6 has a male screw 13 formed at one end thereof and a sphere hole 14 at the other end, the sphere hole 14 having such an inner diameter that the sphere portion 11 just fits into the hole 14 and having a semi-spherical bottom face. Segments 1 are connected together by inserting the shpere portion 11 into the sphere hole 14, calking the opening of the sphere hole 14, and supporting the sphere portion 11 at the sphere hole 14 in such a manner that the sphere portion 11 is capable of rotating but incapable of moving in the direction of the axis of the wire saw; stress would not be exerted on bent portions of the wire saw and so the long life of the wire saw is ensured, and efficiency is high because exertion of large tension is possible, and in addition safety is high and segments 1 can be replaced.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a wire saw used for cutting large stones, etc., and particularly relates to a wire saw that connects a large number of segments in an endless or linear manner through a ball joint. related to what was done.

``Conventional technology'' Conventional wire saws are made by passing a large number of cylindrical abrasive layer chips through a thick stranded metal wire, fixing them at regular intervals, and winding them around a material to be cut, such as a large stone. It runs under tension and cuts the broken material.

``Problems to be Solved by the Invention'' By the way, in this type of wire saw, the wire is repeatedly folded at both ends of each abrasive grain segment, and stress fatigue inevitably accumulates at these points. f (X cracks were generated and easily fractured, which caused the life of the wire saw to be limited earlier than the abrasive layer tip was worn out.

In addition, with conventional wire saws, the wire stretches elastically when tension is applied, so if it breaks during operation, the wire will snap like a whip, which is dangerous, and many of the abrasive layer chips will be destroyed at that time. It was impossible to repair and reuse it, resulting in high running costs.

Furthermore, in order to change the length, it is necessary to change the entire length of the integrally molded wire itself, so it is not possible to easily adjust the length of the work piece.

"Means for Solving the Problems" The present invention has been made in order to solve the above-mentioned problems, and a ball ring is provided coaxially through a constricted neck at one end, and the ball ring is housed at the other end. It is composed of a large number of segments with a ball hole provided coaxially, and a cylindrical abrasive layer chip fixed on the outer periphery. The plurality of segments are rotatably and rotatably connected by narrowing the opening diameter of the segment.

The segment includes a segment main body provided with an abrasive grain layer chip, a male member removably fixed to one end of the segment main body and provided with a neck and a bulb, and a male member removably fixed to the other end of the segment main body. The female member may be fixed and provided with a ball hole. Furthermore, the male member may be molded from a fiber-reinforced composite material.

``Function'' This wire saw has a structure in which a large number of segments with abrasive layer tips are connected via ball joints, so no stress is applied to the bending parts of the wire saw, and there is no risk of breakage due to stress fatigue even after long-term use. Does not occur. Therefore, the service life can be extended compared to conventional wire saws, and since it can be used under a correspondingly large tension, cutting efficiency can be increased.

Furthermore, since there is no elastic elongation even when tension is applied, there is no risk of it snapping off like a whip if any of the connecting parts were to come loose, making it significantly safer than conventional wire saws. In addition, other segments are not destroyed at this time, so it can be used as before by simply replacing the broken segment, and the expensive 1/7i. Running costs can be reduced by increasing layer usage efficiency.

Furthermore, since the number of connected segments can be set arbitrarily, the length of the wire saw can be easily changed depending on the size of the workpiece.

Embodiment FIGS. 1 and 2 are a front view and a cross-sectional view taken along the line ■-■, showing an embodiment of the wire saw according to the present invention.

This wire saw consists of a large number of segments 1 connected in an endless manner, and these segments 1 include a segment main body 4 in which a cylindrical abrasive layer chip 3 is fixed to the outer periphery of a cylindrical connecting member 2, and 4, and a female member 6 fixed to the other end of the segment body 4.

The connection length of each segment 1 is preferably a value determined by the minimum radius of curvature of the wire saw, or approximately 20 to 5011 for a typical stone cutting wire saw. If it is smaller than 20 mm, there will be too many connection points for the segments and the cost will be high. In addition, if it is larger than 50RM, there is a possibility that the wire saw will not run smoothly.

a connection fm2J. t, SKM, stainless steel, SKDM,
It is molded from metal such as SUPjl4, SNCMM, etc., and female threads 7 are formed on both ends of its inner surface.

On the other hand, the abrasive layer chip 3 is made by fixing superabrasive grains such as diamond or CBN with a binder such as metal bond.
Its overall length is equal to that of the connecting piece 2, and it is fixed to the connecting piece 2 by integral sintering, brazing, adhesive, or other means.

A deep spiral slit 8 is formed on the outer peripheral surface of the abrasive layer chip 3.
4 are formed at equal pitches every 90° in the circumferential direction.

The pitch of these slits 8 is determined so that the segment 1 rotates around the axis at a desired rotational speed as the wire saw runs. Also, the depth of the slit 8 is determined by the flange portion, which will be described later! It is said that it reaches the outer peripheral surface of No. 2.

The male member 5 is made of the same material as the connecting tube 2, and has a male screw 9 screwed into the female screw 7 at one end, and a screw l1 integrally connected to the other end through a thin round bar-shaped neck 10. At the same time, a flange 12 having a larger diameter than the connecting piece 2 and a smaller diameter than the abrasive layer chip 3 is formed in the center. This flange portion l2 has a regular hexagonal cross section and can be easily turned using a tool such as a hex wrench.

The diameter of the neck portion IO is approximately 50 to 80% of the diameter of the spherical portion 11, preferably 60 to 70%. If it is less than 50%, the strength of the neck IO will be lower than that of other parts, and sufficient connection strength will not be obtained. Moreover, if it is larger than 80%, there is a risk that the ball II will come out of the ball hole 14, which will be described later.

The female member 6 is also molded from the same material as the connecting piece 2, and has a male thread I3 screwed into the female thread 7 at one end, and a coaxial ball hole l4 at the other end. This ball hole 1
4 has an inner diameter into which the ball hole 11 can fit almost without any gap, and its bottom surface is formed into a hemispherical shape, and the ball hole l is formed from the end surface of the abrasive layer chip 3.
The distance to the center of 4 is set equal to the distance from the edge of the abrasive layer chip 3 to the center of the ball 11 in the male member 5. If these values differ by more than a certain amount, the abrasive layer chip 3 will be different from each segment! The abrasive layer tip 3 may be unevenly worn in the longitudinal direction because the abrasive layer tip 3 is not located in the center between the connecting centers of the abrasive layer.

The wall thickness of the peripheral wall of the ball hole 14 before crimping is set according to the material so that sufficient connection strength can be obtained by crimping. Specifically, 7 to 40% of the diameter of the female member 6, preferably! It is considered to be 0 to 20%. If it is less than 7%, the peripheral wall of the ball hole l4 becomes thin and sufficient connection strength cannot be obtained. 40 again
If it is larger than %, the effective usage amount of the abrasive layer chips 3 decreases, and the outer diameter of the abrasive layer chips 3 must be increased, which is not preferable.

Further, the depth of the ball hole I4 before crimping is approximately 0.6 to 0.95 times the diameter of the ball hole I1. If it is less than 0.6 times, caulking cannot be performed, and if it is more than 0.95 times, it is difficult to caulk while the ball portion 11 is rotatable.

The female member 6 is formed to have a regular hexagonal cross section with the same diameter as the flange l2 of the male member 5, and can be turned in the same hexagonal range as the flange l2.

Then, by cold caulking the opening of the ball hole l4 with the ball part 11 inserted into the ball hole 14, the ball hole II can rotate at a desired angle within the ball hole l4, but cannot move in the axial direction. The segments l are connected to each other.

According to the wire saw having the above configuration, each segment 1 is connected by a ball joint consisting of a ball hole II and a ball hole 14, so stress is not applied to the bending point and breakage due to stress fatigue occurs even after long-term use. do not have. Therefore, the service life can be extended compared to conventional wire saws, and since it can be used under a correspondingly large tension, cutting efficiency can be increased.

In addition, even when tension is applied, each segment 1 does not stretch elastically, so even if one of the connecting parts comes off, there is no risk of the wire saw snapping like a whip, making it safer than conventional products. .

Furthermore, even if segment 1 becomes disconnected and the wire saw breaks, other segments 1 will not be destroyed.
Since it can be used as before by simply replacing the segment 1 at the cut location, it is possible to improve the usage efficiency of the expensive abrasive layer chip 3 and reduce running costs.

Furthermore, since the length of the wire saw can be freely set by simply changing the number of connected segments 1, there is an advantage that it can easily and flexibly correspond to the size of the material to be cut.

In addition, in this embodiment, the male member 5 and the female member 6 are removable from the segment body 4, so if the connecting portion is damaged, only the male member 5 and the female member 6 can be replaced with new ones for quick repair. Moreover, the overall length of the wire saw can be easily changed.

Further, since the spiral slit 8 is formed on the outer circumferential surface of the abrasive layer chip 3, each segment 1 rotates from each connected portion due to friction with the cutting material. As a result, the entire circumferential surface of the abrasive layer tip 3 is uniformly used for grinding, no uneven wear occurs, and good sharpness can be maintained for a long period of time.

In the above embodiment, the male member 5 is integrally formed of metal, but the material of the male member 5 may be changed as shown in (1) to (4) below.

■ Carbon fiber-reinforced resin (C
Fiber reinforced resin (FRP) such as FrtP) is used. By molding with such FRP, the weight can be significantly reduced compared to when it is made of metal, and the driving force of the wire saw can be reduced. In particular, when molded with CFRP, the carbon fibers are exposed at the sliding area and the sliding resistance is significantly reduced, so the driving force required for running the wire saw can be reduced.

■ Fiber-reinforced metals (FRM) in which boron fibers, carbon fibers, silicon carbide fibers, tyranno fibers, alumina fibers, and fibers such as SiC and SIN4 are separated into metals such as Al, Ti, Mg, or alloys thereof. ).

■ AI! 03, Si. Use abrasion-resistant ceramics such as NiSiC.

Also, instead of changing the material itself, the ball part! It is also possible to perform the following surface treatment on at least a portion of the sliding surfaces of ball hole 4 and ball hole 4 to improve their corrosion resistance and abrasion resistance.

■ One or more substances selected from carbides such as TiC, nitrides such as TiN, borides such as BN, oxides such as Allow, diamond, etc., are processed using the ion blating method, PVD method, CVD method, etc. Coat the sliding surface using either of these.

■ Form a coating layer of wear-resistant material such as ceramic or cobalt alloy on the sliding surface using powder plasma overlay or overlay welding.

■ A highly wear-resistant thin plate made of cemented carbide, high-strength ceramics, etc. is fixed to the sliding body by means such as brazing or crimping.

■ Apply Kanigen plating, hard chrome plating, nickel plating, etc. to the sliding surface.

■Nitriding or carburizing the sliding surfaces in a vacuum heat treatment furnace, etc.

Furthermore, the ball part 11 is made of S which is more abrasion resistant than the neck part IO.
It may be formed of metal such as K steel, SKD steel, or cemented carbide, and fixed to the neck by friction welding, high frequency brazing, resistance heating, or the like.

On the other hand, in the above embodiment, the spiral slit 8 is formed in the abrasive layer chip 3, but a configuration in which this type of slit is not formed may be used, or a part of the abrasive layer chip 3 in the longitudinal direction may be used. A configuration in which a spiral slit is formed only in the slit is also possible.

Further, in the above embodiment, the male member 5, the segment main body 4, and the female member 6 are separable, but it is also possible to make these into an integral structure that cannot be separated, or only the male member 5 and the segment main body 4 can be separated. It may be made into an integral structure and molded with the various composite materials mentioned above.

"Effects of the Invention" As explained above, the wire saw according to the present invention has a structure in which each segment is connected by a ball joint, so no stress is applied to the bent part, and there is no possibility of breakage due to stress fatigue even after long-term use. Does not occur.

Therefore, the service life can be extended compared to conventional wire saws, and since it can be used under a correspondingly large tension, cutting efficiency can be increased.

In addition, since no elastic elongation occurs when tension is applied, there is no risk of it snapping like a whip even if any of the connecting parts should come loose, making it safer than conventional wire saws.

In addition, even if a segment becomes uncoupled and the wire saw breaks, the other segments will not be destroyed and can be used as before by simply replacing the segment at the cut point. Running costs can be reduced by increasing layer usage efficiency.

Furthermore, the length of the wire saw can be changed arbitrarily by simply changing the number of connected segments, so it can flexibly handle workpieces of any size.

On the other hand, if the male and female members are removable from the segment, if the connecting part is damaged, the wire saw can be repaired or the length can be changed by replacing only the male and female members with new ones. ') The advantage is that it is easy to perform the exercise.

[Brief explanation of the drawing]

FIG. 1 and FIG. 2 are a front view and a sectional view taken along the line ■-■, showing an embodiment of the wire saw according to the present invention. ■... Segment, 3... Abrasive layer chip, 5... Male member, 8... Slit, II... Ball portion, 14... Ball hole. 2... Connection piece, 4... Segment body, 6... Female member, 10... Neck, ! 2...flange part,

Claims (3)

[Claims] (1) A ball is provided coaxially through a constricted neck at one end, and a ball hole that can accommodate the ball is provided coaxially at the other end, and a cylindrical abrasive layer chip is fixed to the outer periphery. The spherical part is housed in the spherical hole of another adjacent segment, and by narrowing the opening diameter of the spherical hole, the numerous segments are rotatably and rotatably connected. A wire saw characterized by: (2) The segment includes a segment main body provided with the abrasive layer chip, a male member removably fixed to one end of the segment main body and provided with the neck and bulb, and the other end of the segment main body. The wire saw according to claim 1, further comprising a female member which is detachably fixed and is provided with the ball hole. (3) The wire saw according to claim 2, wherein the male member is made of a fiber-reinforced composite material.