JP2007253267A - Wire saw - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wire saw having superior grinding capacity by effectively using a grinding surface of beads by preventing partial abrasion of the beads. <P>SOLUTION: Columnar beads 2 with a circular cross section, on the surface of a cylindrical metal base of which a super-abrasive layer is formed, are spaced in this wire saw 1 in a longitudinal direction of a wire 3. Constant width beads 4 with a Reuleux's constant width cross section are arranged every arbitrary number of the columnar beads 2. The constant width beads 4 are spaced in the longitudinal direction of the wire, while the direction of peaks of the beads is sequentially changed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a wire saw that is used when cutting stone, concrete, building materials, and the like.

  When cutting stone, concrete, building materials, or the like, a wire saw is used in which a large number of cylindrical beads, to which a superabrasive layer is fixed, are connected in a rosary shape to a steel wire or the like. Such a wire saw is used for cutting the above-mentioned work material by connecting the ends of the wire into an endless shape and applying a tension to drive the pulley.

In conventional wire saws, the bead shape is cylindrical, and twisting the ends of the wire will allow these beads to rotate so that only certain surfaces of the beads do not wear. ing.
However, in practice, it is difficult to rotate the cylindrical beads effectively, and the contact surface of the beads with the work material during the cutting process is indeterminate, and a part of the bead surface is ground as a contact surface. If it contributes, it will become stable as a grinding surface because the surface will be shaved, and the partial wear which only a specific surface wears will arise. As a result, the beads are unevenly worn and have a short life.
A wire saw for preventing uneven wear of beads is described in Patent Document 1. Further, the inventor of the present invention invented a wire saw constituted by beads having a polygonal cross section, and this wire saw is disclosed in Patent Document 2.

Japanese Patent Laid-Open No. 11-156635 JP 2005-238348 A

The wire saw described in Patent Document 1 tries to suppress uneven wear of beads by arranging beads using superabrasive grains having a larger particle diameter between the superabrasive beads. Since the wear-induced beads further wear on the contact surface with the work material, uneven wear cannot be sufficiently suppressed.
When uneven wear occurs on the beads, the beads become unstable with respect to the cutting direction, and the machined surface becomes wavy. In addition, since the ground surface of the beads is not used effectively, the life of the wire saw is significantly reduced.
In addition, the wire saw described in Patent Document 2 does not promote rotation of a cylindrical bead with a polygonal cross section, but is connected like a Mobius ring, and the grinding surface is forcibly changed in turn. By being used, uneven wear is prevented. For this reason, there is a restriction on surface matching at the time of coupling.

  In order to prevent uneven wear of the beads, it is possible to take measures such as changing the number of twists of the wire saw or tilting the pulley shaft of the processing machine, but if the number of times of twisting of the wire saw is changed, the wire saw It becomes difficult to install the machine on the machine. Further, if the pulley shafts of the processing machine are tilted with respect to each other, there is a problem that the life of the liner (the part that receives the wire saw) is shortened.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a wire saw having excellent grinding ability by preventing uneven wear of beads and effectively utilizing the grinding surface of beads. .

  In order to solve the above-mentioned problems, the wire saw of the present invention has cylindrical beads having a superabrasive grain layer formed on the surface of a cylindrical base metal and having a circular cross section arranged at intervals in the longitudinal direction of the wire. Each time an arbitrary number of the cylindrical beads are arranged, a polygon having a cross-section other than a circle and connecting each vertex of the polygon with a convex arc and having a corner number of 3 to 10 Shaped beads are arranged.

Each time an arbitrary number of cylindrical beads are arranged, a polygonal bead having a cross-section other than a circle and connecting each vertex of a polygon with a convex arc, and having a corner number of 3 to 10 By being arranged, rotation of the cylindrical beads is forcibly promoted, and uneven wear due to only a specific surface of the cylindrical beads coming into contact with the work material can be prevented.
The polygonal beads may have a fixed width of a rouleau based on any one of a triangular shape, a pentagonal shape, a heptagonal shape and a nine-sided shape.

In the present invention, the polygonal beads are arranged at intervals in the longitudinal direction of the wire by sequentially changing the apex direction.
Since the polygonal beads are arranged with their apex direction changed in sequence, each time the polygonal beads come into contact with the work material, the cylindrical beads contact the work material after this polygonal bead. The face is off. Therefore, the cylindrical bead does not have a biased contact surface with the work material.

In this invention, it arrange | positions so that the arrangement | positioning angle of the said polygonal bead may change sequentially in the range of 10 degrees or more and 60 degrees or less.
If the angle is less than 10 °, the straight line drawn perpendicularly to the work material from the fulcrum where the polygonal bead contacts the work material and the position of the center of gravity of the polygon bead are too close, and the cylindrical bead The function of forcibly causing rotation is reduced. Similarly, even if the angle exceeds 60 °, the straight line drawn perpendicularly to the work material from the fulcrum where the polygonal bead contacts the work material is too close to the position of the center of gravity of the polygon bead, and the cylindrical bead The function of forcibly causing rotation is reduced.

In the present invention, the cylindrical beads are arranged in a ratio of 3 to 6 with respect to one polygonal bead.
If less than three cylindrical beads are arranged for one polygonal bead, the effect of promoting rotation by the polygonal beads can be sufficiently obtained. The area is reduced and the service life is drastically reduced. Further, the rotation effect is too high, and the entire wire saw becomes unstable, and vibration is likely to occur. On the other hand, when more than six cylindrical beads are arranged with respect to one polygonal bead, since the ratio of the cylindrical beads is large, the working area is large and the wear amount is reduced. Since the proportion occupied by the shape beads is small, sufficient rotation cannot be obtained, uneven wear occurs, and the life is shortened.

  According to the present invention, the rotation of the cylindrical beads is promoted, and it is possible to prevent uneven wear due to only a specific surface of the cylindrical beads coming into contact with the work material. A wire saw having excellent grinding ability can be realized by effectively using the grinding surface.

Below, the wire saw of this invention is demonstrated based on the embodiment.
FIG. 1 shows a wire saw according to an embodiment of the present invention.
As shown in FIG. 1, in the wire saw 1, columnar beads 2 having a superabrasive grain layer formed on the surface of a cylindrical base metal and having a circular cross section are spaced apart from each other in the longitudinal direction of the wire 3. Are arranged. Each time an arbitrary number of cylindrical beads 2 are arranged, constant-width beads 4 having a constant-width shape with a cross-section are arranged.

An example of a cross section of the fixed-width bead 4 is shown in FIG. This example is a case of a fixed-width shape of a ruler based on a triangle, and this fixed-width shape is centered on each of the three vertices A, B, and C of the triangle as shown in FIG. It is a figure surrounded by drawn arcs a, b, and c. As shown in FIG. 2B, this figure has a property that the distances h between one vertex and the arc corresponding thereto are all equal.
The cross-section of the constant-width bead 4 in the present invention is not limited to the ruled-width shape of the roule based on the triangle shown here, and the constant width can be made based on pentagons, heptagons, and hexagons in the same manner. It may be a shape.

The fixed-width beads 4 are arranged at intervals in the longitudinal direction of the wire 3 by sequentially changing the direction of the apexes thereof, and details thereof are shown in FIG.
If the fixed-width bead 4 is sequentially arranged from the left side to the right side of the wire 3 shown in FIG. 1, the first fixed-width bead 4 has two vertices B and C close to the work material. Arranged to be horizontal. Next, the second constant-width bead 4 is arranged so that the angle formed by the straight line connecting the two apexes B and C close to the work material and the horizontal direction forms a predetermined angle θ. Next, the third constant-width bead 4 is arranged so that the angle formed by the straight line connecting the two apexes B and C close to the work material and the horizontal direction forms a predetermined angle 2θ. In this way, the apex direction is sequentially changed so that the angle formed by the straight line connecting the two apexes B and C close to the work material and the horizontal direction becomes 3θ and 4θ.

  When the fixed-width bead 4 is arranged as described above, every time the fixed-width bead 4 comes into contact with the work material, the cylindrical bead 2 that comes into contact with the work material after this fixed-width bead 4 is forced to It will be rotated. Therefore, the contact surface of the cylindrical bead 2 that contacts the work material after the fixed-width bead 4 is in contact with the work material before the fixed-width bead 4. Deviates from the contact surface. Since the displacement of the contact surface of the cylindrical bead 2 occurs sequentially, the surface that acts on the grinding of the cylindrical bead 2 is not biased to a specific surface, and the ground surface can be used evenly. It is possible to prevent uneven wear.

As described above, in the wire saw of the present invention, the fixed-width bead 4 has a function of promoting the rotation of the cylindrical bead 2, and the fixed-width bead 4 is arranged at an appropriate interval so that the cylindrical bead The 2 grinding surfaces can be used evenly.
The angle θ between the straight line connecting the two apexes B and C close to the work material shown in FIG. 3 and the horizontal direction is 10 ° or more and 60 ° or less. If it is out of this range, the straight line 5 drawn perpendicularly to the work material from the fulcrum where the fixed-width bead 4 contacts the work material and the position of the center of gravity of the constant-width bead 4 are too close to each other. This is because the function of forcibly causing rotation with respect to 2 decreases.

In the above description, the polygonal bead is limited to the fixed-width bead 4, but the polygonal bead has a cross-section other than a circle and connects each vertex of the polygon with a convex arc. The shape may be 3 or more and 10 or less. An example of this shape is shown in FIG.
FIG. 4 shows a shape based on a quadrangle, which has a shape in which the vertices A, B, C, and D of the quadrangle are connected by convex arcs a, b, c, and d. Even if beads having such a cross section are used, the cylindrical beads 2 can be forced to rotate.

Based on FIG. 5, the difference in generation of grinding resistance will be described between a case where a polygon having an odd number of corners is basically used and a case where a polygon having an even number of corners is basically used.
When the workpiece 6 is ground using a wire saw, the portion of the workpiece 6 that contacts the wire saw is cut into a semicircular shape. Since the fixed-width bead 4 is based on a polygon having an odd number of corners, as shown in FIG. 5A, A which is one of the vertices of the fixed-width bead 4 is a work material. When in contact with the workpiece, the opposite side is not an apex, but an arc, and does not contact the work material. Accordingly, no grinding resistance is generated here.

  On the other hand, in a polygon based on an even number of polygons, as shown in FIG. 5 (b), when A which is one of the vertices of the polygonal bead 7 is in contact with the work material, The opposite side is also apex C, and grinding resistance is likely to occur here. This situation is the same for an elliptical cross section. Therefore, as in the case of the fixed-width bead 4, a polygon based on an odd number of polygons generates grinding resistance compared to a polygon based on an even number of corners or an ellipse. There is an advantage that it is difficult to do.

Specific test examples are shown below.
Table 1 shows the test conditions.

The test results are shown in FIGS.
FIG. 6 shows a comparison between a case where only cylindrical beads are arranged, a case where elliptical beads are arranged between cylindrical beads, and a case where constant-width beads are arranged between cylindrical beads. In the wire saw in which the elliptical beads are arranged, 10 elliptical beads (10 pieces / m) are arranged per 1 m, and in the wire saw in which the fixed-width type beads are arranged, 10 pieces of constant-width beads (10 pieces / meter) are arranged. m) It is arranged.
The one with the oval beads has a longer life than the one with only the cylindrical beads, and the life is longer. The life is further extended because of the large.

FIG. 7 shows the test results when the ratio of arranging the fixed-width beads is changed. The one with 10 fixed-width beads per meter (10 / m) has the longest life, whereas the one with 5 fixed-width beads (5 / m) per meter or a constant width A product in which 20 beads (20 pieces / m) are arranged per 1 m has a shorter life.
The arrangement of 10 fixed-width beads (10 / m) per 1 meter corresponds to the arrangement of 3 cylindrical beads per 1 fixed-width bead. The arrangement of 5 beads per meter (5 / m) corresponds to the arrangement of 7 cylindrical beads per 1 fixed-width bead, and 1 m of fixed-width beads. The arrangement of 20 per unit (20 / m) corresponds to the arrangement of one cylindrical bead with respect to one constant-width bead.

  When 20 fixed-width beads are arranged per meter (20 pieces / m), the effect of promoting rotation by the fixed-width beads can be obtained sufficiently, but the number of fixed-width beads increases so much that the cylindrical beads are Since the ratio occupied is small, the working area is reduced and the life is reduced. In addition, in the case where 5 fixed-width beads are arranged per meter (5 / m), since the ratio of the fixed-width beads occupies a small amount, the rotation effect cannot be obtained sufficiently, uneven wear occurs, and the service life is increased. Has fallen.

  INDUSTRIAL APPLICABILITY The present invention can be used as a wire saw that prevents uneven wear of beads and has an excellent grinding ability by effectively using the ground surface of the beads.

It is a figure which shows the wire saw which concerns on embodiment of this invention. It is a figure which shows the cross-sectional shape of a fixed-width bead. It is a figure which shows the mode of arrangement | positioning of a fixed-width bead. It is a figure which shows an example of a polygon-shaped bead. It is a figure for demonstrating generation | occurrence | production of the grinding resistance by a polygon-shaped bead. It is a figure which shows a test result. It is a figure which shows a test result.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Wire saw 2 Cylindrical bead 3 Wire 4 Constant width type bead 5 Straight line 6 Work material 7 Polygon-shaped bead

Claims (5)

  Each time a cylindrical bead having a superabrasive grain layer formed on the surface of a cylindrical base metal and having a circular cross section is arranged at an interval in the longitudinal direction of the wire, an arbitrary number of the cylindrical beads are arranged. A wire saw characterized in that a polygonal bead having a cross-section other than a circle and connecting each vertex of a polygon with a convex arc and having a corner number of 3 to 10 is disposed.   2. The wire saw according to claim 1, wherein the polygonal bead has a constant width shape of a Roule based on any one of a triangle, a pentagon, a heptagon, and a nine-sided cross section.   The wire saw according to claim 1 or 2, wherein the polygonal beads are arranged at intervals in the longitudinal direction of the wire by sequentially changing the direction of the apexes thereof.   The wire saw according to claim 3, wherein the polygonal beads are arranged so that an arrangement angle of the polygonal beads sequentially changes in a range of 10 ° to 60 °.   The wire saw according to any one of claims 1 to 4, wherein the cylindrical beads are arranged at a ratio of 3 to 6 with respect to one polygonal bead.

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