JPH03184716A - Wire saw - Google Patents

Abstract

PURPOSE:To improve a grinding efficiency in a wire saw used for a large stone cutting, etc., by making a lot of abrasive grain layer tips fitted to a flexible base body freely rotatable and also forming a spiral groove inclined at a constant angle on the outer peripheral face thereof. CONSTITUTION:This wire saw is what is endlessly connected with a lot of segments 1 equipped with abrasive grain layer tips 3. These segments 1 are composed of a segment main body 4 fixed with a cylindrical abrasive grain layer tip 3 on the outer periphery of a connection cylinder 2, a male member 5 fixed to the end of this segment main body 4 and a female member 6. A connection cylinder 2 is formed with the metal of an SK steel, etc., and a female thread 7 is formed respectively at both ends of the inner face thereof. On the other hand, a spiral groove 8 inclined at a constant angle to the axial line is formed on the outer peripheral face of each abrasive grain layer tips 3. Each segment 1 are then connected rotatably at a desired angle, when an open part is calked by inserting the spherical part 11 of the male member 5 into the spherical hole 14 of the female member 6.

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 an improvement for preventing uneven wear of an abrasive layer tip.

``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 workpiece such as a large stone. It is run under tension to cut the work material.

``Problem to be solved by the invention'' However, with this type of wire saw, if the wire saw is simply wound around the workpiece and run, only the same side of the abrasive layer tip is used for grinding, and the abrasive layer tip wears unevenly. However, there are problems in that the service life is short and limited, and the abrasive grain usage efficiency is poor.

For this reason, in the past, a mechanism was installed on the drive device that runs the wire saw to rotate the wire saw around its axis at the same time as the wire saw runs, gradually changing the side surface that touches the workpiece, so that the entire surface of the abrasive layer tip is used evenly. In this way, uneven wear was prevented.

However, providing such a rotation mechanism complicates the structure of the drive device, which inevitably increases the frequency of failures and equipment costs, and the wire saw has to change its circumferential direction inside the drive device every time it makes a turn. Since the same side of the chisel is used for grinding while traveling around the workpiece, this side is likely to become clogged, which reduces sharpness and causes local overheating of the abrasive layer. There are some problems that can easily occur.

"Means for Solving the Problems" The present invention has been made to solve the above problems, and includes a large number of cylindrical abrasive layer chips coaxially arranged at intervals on a long and flexible base body. The attached wire saw is characterized in that the abrasive layer tips are rotatable around the axis, and a spiral groove is formed on the outer peripheral surface of each abrasive layer tip at a constant angle with respect to the axis.

In this wire saw, the spiral groove formed on the outer peripheral surface of the abrasive layer tip generates a rotational moment due to friction with the workpiece material.
The individual abrasive layer chips rotate around an axis. therefore,
Unlike conventional wire saws, there is no need to provide a rotation mechanism to the drive device, and the structure of the drive device can be simplified, reducing the frequency of failures and equipment costs.

In addition, since the abrasive layer tip continues to rotate during grinding, the side surface of the abrasive layer used for grinding constantly changes, effectively discharging chips and preventing clogging, improving grinding efficiency. In addition, there is an advantage that local overheating of the abrasive grain layer does not occur.

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.

In this embodiment, instead of passing an abrasive layer chip through a metal stranded wire and fixing it as in a conventional wire saw, a large number of segments 1 each having an abrasive layer chip are connected in an endless manner.

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 cylinder 2, and a male member 5 fixed to one end of this segment main body 4.
and a female member 6 fixed to the segment main body 4 and is.

That is, the base body in this example stands out from the segment body 4, the male member 5 and the female member 6.

The connecting length of each segment 1 should be determined by the minimum radius of curvature of the wire saw, but it is preferably about 20 to 50 xx for a wire saw for cutting stone inside the shell. If it is smaller than 2011M, there will be too many segments to connect and the cost will increase.

Moreover, if it is larger than 50i+i, there is a possibility that the wire saw will not run smoothly.

The connecting tube 2 is SK sea bream, stainless steel style, 5KDj14.5
It is formed of metal such as UPII or SNCM steel, and female threads 7 are formed at 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 cylinder 2, and it is fixed to the connecting cylinder 2 by integral sintering, brazing, adhesive, or other means.

On the outer peripheral surface of the abrasive layer chip 3, four spiral grooves 8 having a U-shaped cross section and inclined with respect to the axis of the abrasive layer chip 3 are formed at equal pitches every 90° in the circumferential direction. . The angle of inclination of these spiral grooves 8 with respect to the axis is determined so that the segment 1 rotates around the axis at an appropriate number of rotations as the wire saw runs, and is specifically 3 to 30 degrees, preferably 5 to 1 degrees.
It is said to be 5°. If it is less than 3 degrees, the rotation speed will be insufficient and the rotation speed will be 30 degrees.
If it is larger, the rotational speed will be too high and the wear of the connecting parts will be severe.

The depth of the spiral groove 8 is set to reach the usable limit radius of the abrasive layer chip 3, and in this example, the depth of the spiral groove 8 is set to reach the usable limit radius of the abrasive layer chip 3, and in this example, the flange portion I described later is
It is said that it reaches the outer peripheral surface of No. 2.

Further, the width of the spiral groove 8 is 5 of the total circumferential length of the abrasive layer chip 3.
~30%, more preferably about 10~20%.

If it is less than 5%, sufficient rotational force will not be generated, and if it is more than 30%, there is a risk that the grinding force will decrease.

The male member 5 is made of the same material as the connecting tube 2, and has a male screw portion 9 screwed into the female screw 7 at one end, and a ball portion II integrally formed at the other end via a thin round rod-shaped neck portion 10. At the same time, a flange portion 12 having a larger diameter than the connecting cylinder 2 and a smaller diameter than the abrasive layer tip 3 is formed in the center. This flange l112 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 10 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 portion II may come off from the ball hole 14, which will be described later.

The female member 6 is also molded from the same material as the connecting tube 2, and has a male threaded portion 13 screwed into the female member 7 at one end thereof, and a coaxial ball hole 14 formed at the other end. This ball hole 1
4 has an inner diameter that allows the ball part II to fit therein almost without any gap, and its bottom surface is formed into a hemispherical shape, and the ball hole 4 is formed from the end surface of the abrasive layer chip 3.
4 is set equal to the distance from the end surface of the abrasive layer chip 3 to the center of the spherical portion 11 in the male member 5. If these values exceed a certain level, the abrasive layer chip 3 will not be located at the center between the connecting centers of the segments 1, and there is a risk that the abrasive layer chip 3 will wear unevenly in the longitudinal direction. 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.

The female member 6 is formed in a regular hexagonal cross section with the same diameter as the flange portion 12 of the male member 5, and can be turned with the same hexagonal wrench as the flange 1112.

Then, with the ball part 11 inserted into the ball hole 14, the opening of the ball hole 14 is cold crimped, so that the ball part I! is supported within the spherical hole 14 so as to be rotatable at a desired angle and immovable in the axial direction, and each segment I is connected.

When the wire saw having the above configuration is wound around a workpiece and run, a spiral WIt formed on the outer peripheral surface of the abrasive layer tip 3
8 generates a rotational moment due to friction with the workpiece, and the individual segments 1 rotate in unison around the axis in the same direction. Therefore, unlike conventional wire saws, there is no need to provide the drive device with a rotating mechanism, and the structure of the drive device can be simplified, reducing the frequency of failures and equipment costs.

Also, since segment I continues to rotate during grinding,
The side surface used for grinding the abrasive layer chip 3 is constantly changing,
This has the advantage that chips can be effectively discharged to prevent clogging, grinding efficiency can be improved, and local overheating of the abrasive grain layer 3 does not occur.

In addition, this wire saw has a structure in which each segment 1 is rotatably and rotatably connected by a ball joint consisting of a ball part II and a ball hole 14, so no stress is applied to the bending part.
No breakage due to stress fatigue even after long-term use. For this reason, 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, 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 workpiece.

Furthermore, since the male member 5 and female member 6 are removable from the segment main body 4, if the connecting part is damaged, it can be quickly repaired by replacing only the male member 5 and female member 6 with new ones, and The overall length can also be easily changed.

The number of spiral WIt8 may be two as shown in FIG. 3 or three as shown in FIG. 4, or five or more may be formed at equal intervals in the circumferential direction.

Further, the cross-sectional shape of the spiral groove 8 is not limited to the above-mentioned U-shape, but may also be a trapezoidal shape as shown in FIG. 5, a triangular shape as shown in FIG. 6, or a semicircular shape as shown in FIG. .

In either case, the smaller the angle β of the edges on both sides of the spiral groove 8, the more likely the edges will bite into the workpiece, so the abrasive layer tip 3 can be rotated more efficiently.

Further, in the above embodiment, the male member 5 is integrally molded from metal, but it may be molded from other materials, or the male member 5, segment main body 4, and female member 6 may have an integral structure that cannot be separated. is also possible.

Further, as shown in FIG. 8, a cylindrical elastic tube 20 may be provided to cover the connecting portion between the male member 5 and the female member 6. This elastic cylinder 20 is molded from various elastic materials such as rubber, and allows relative rotation and rotation of the male member 5 and female member 6, so its outer diameter is smaller than that of the abrasive layer tip 3. . By providing such an elastic tube 20, it is possible to prevent chips and fallen abrasive grains from entering the connecting portion, and it is possible to prevent the connecting portion from being worn out due to their entry.

Zara? The present invention is not limited to the above-described segment-connected wire saw J, but can also be applied to a structure in which a metal stranded wire is used as the base like a normal wire saw, and an abrasive layer chip is rotatably attached to this. good. Further, the base body is not limited to an endless shape, and may be configured to have a linear shape and cut the workpiece by reciprocating motion.

"Effects of the Invention" As explained above, according to the wire saw according to the present invention, the spiral groove formed on the outer circumferential surface of the abrasive grain layer tip generates a rotational moment due to friction with the work material, and the individual abrasive grains The layer chip rotates around its axis. Therefore, unlike conventional wire saws, there is no need to provide the drive device with a rotating mechanism, and the structure of the drive device can be simplified, reducing the frequency of failures and equipment costs.

In addition, since the abrasive layer tip continues to rotate during grinding, the side surface of the abrasive layer used for grinding constantly changes, effectively discharging chips and preventing clogging, improving grinding efficiency. In addition, there is an advantage that local overheating of the abrasive grain layer does not occur.

[Brief explanation of drawings]

FIGS. 1 and 2 are a partially broken front view showing one embodiment of the wire saw according to the present invention, and a cross-sectional view along the line ■-■. FIGS. 3 to 7 are cross-sectional views showing modified examples of the spiral groove. ,
FIG. 8 is a partially cutaway front view showing another embodiment of the present invention. l... Segment, 2... Connecting portion, 3... Abrasive layer chip, 4... Segment body (part of the base), 5... Male member (part of the base), 6. ...Female member (-1 of the base), 8...Spiral groove.

Claims (1)

[Scope of Claims] A wire saw in which a large number of cylindrical abrasive layer tips are coaxially attached to a long and bendable base body at intervals, the abrasive layer tips are rotatable around an axis, and ,
A wire saw characterized in that a spiral groove inclined at a certain angle with respect to an axis is formed on the outer peripheral surface of each abrasive layer tip.