JP4180057B2 - Wire saw - Google Patents

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.

Japanese Patent Laid-Open No. 11-156635

This wire saw is intended to suppress uneven wear of beads by placing beads using superabrasive grains having a larger particle size between the superabrasive beads, but once caused uneven wear. Since the 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 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 problems, the wire saw of the present invention is formed by attaching a superabrasive grain layer to the surface of a cylindrical base metal, and cylindrical beads having a circular cross section are spaced apart in the longitudinal direction of the wire. Each time an arbitrary number of the cylindrical beads are arranged, elliptical beads having an elliptical cross section are arranged.
Each time an arbitrary number of cylindrical beads are arranged, elliptical beads with an elliptical cross section are arranged to forcibly accelerate the rotation of the cylindrical beads, thereby identifying the cylindrical beads. It is possible to prevent uneven wear due to contact of only the surface with the work material.

In the present invention, the elliptical beads are arranged at intervals in the longitudinal direction of the wire by sequentially changing the direction of the long axis.
Since the elliptical beads are arranged by sequentially changing the direction of the long axis, each time the elliptical beads contact the work material, the cylindrical beads that contact the work material after the elliptical beads are arranged. The contact surface is misaligned. Therefore, the cylindrical bead does not have a biased contact surface with the work material.

In the present invention, an angle formed between a perpendicular drawn to the elliptical bead from a fulcrum where the elliptical bead contacts the work material and a major axis of the elliptical bead is 10 ° or more and 60 ° or less. It arrange | positions so that it may change sequentially in the range, It is characterized by the above-mentioned.
If the angle is less than 10 °, the perpendicular drawn to the elliptical bead from the fulcrum where the elliptical bead contacts the work material and the position of the center of gravity of the elliptical bead are too close to the cylindrical bead. On the other hand, the function of forcibly causing rotation is reduced. Similarly, even when the angle exceeds 60 °, the perpendicular drawn from the fulcrum where the elliptical bead contacts the work material to the elliptical bead and the position of the center of gravity of the elliptical bead are too close to the cylindrical bead. On the other hand, the function of forcibly causing rotation is reduced.

In the present invention, the cylindrical beads are arranged in a ratio of 3 to 30 per one of the elliptical beads.
If less than three cylindrical beads are arranged for one elliptical bead, the effect of promoting rotation by the elliptical bead can be sufficiently obtained, but since the proportion occupied by the cylindrical bead is small, it acts. 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 30 cylindrical beads are arranged with respect to one elliptical bead, the working area is large because the proportion of the cylindrical beads is large and the wear amount is reduced. Since the proportion occupied by the shaped 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, a cylindrical bead 2 having a circular cross section formed by fixing a superabrasive grain layer on the surface of a cylindrical base metal is formed with respect to the longitudinal direction of the wire 3. Arranged at intervals. Each time an arbitrary number of the cylindrical beads 2 are arranged, an elliptical bead 4 having an elliptical cross section is arranged.

The elliptical beads 4 are arranged at intervals in the longitudinal direction of the wire 3 by sequentially changing the direction of the major axis, and the details are shown in FIG.
If the elliptical beads 4 are sequentially arranged from the left side to the right side of the wire 3 shown in FIG. 1, the first elliptical beads 4 are elliptical from the fulcrum where the elliptical beads 4 come into contact with the work material. The perpendicular 5 drawn with respect to the bead 4 and the major axis of the ellipse of the elliptical bead 4 are arranged so as to coincide with each other. Next, the second elliptical bead 4 has a perpendicular 5 drawn from the fulcrum where the elliptical bead 4 contacts the work material to the elliptical bead 4 and the long axis of the elliptical bead 4 is predetermined. It arrange | positions so that the angle (theta) of this may be made. Next, the third elliptical bead 4 has a perpendicular angle drawn from the fulcrum where the elliptical bead 4 is in contact with the work material to the elliptical bead 4 and the major axis of the elliptical bead 4 at a predetermined angle. It arrange | positions so that 2theta may be made. In this way, the direction of the long axis is such that the perpendicular drawn to the elliptical bead 4 from the fulcrum where the elliptical bead 4 contacts the work material and the long axis of the elliptical bead 4 are 3θ, 4θ. Are sequentially changed.

  When the elliptical beads 4 are arranged as described above, each time the elliptical beads 4 come into contact with the work material, the cylindrical beads 2 coming into contact with the work material after the elliptical beads are forcibly rotated. It becomes. Therefore, the contact surface of the cylindrical bead 2 that contacts the work material after the elliptical bead 4 is in contact with the work material before the elliptical bead 4. Deviate from. 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 elliptical beads 4 have a function of promoting the rotation of the cylindrical beads 2, and the elliptical beads 4 are arranged at appropriate intervals, so that the cylindrical beads 2 The main feature is that the ground surface can be used evenly.
As shown in FIG. 2, θ, which is an angle formed by a perpendicular drawn to the elliptical bead 4 from a fulcrum where the elliptical bead 4 comes into contact with the work material, and the major axis of the elliptical bead 4 is 10 ° or more and 60 °. It is as follows. Outside this range, the perpendicular drawn to the elliptical bead 4 from the fulcrum where the elliptical bead 4 contacts the work material and the position of the center of gravity of the elliptical bead 4 are too close to the cylindrical bead 2. This is because the function of forcibly causing rotation is reduced.

Specific production examples and test examples are shown below.
A wire saw having the configuration shown in FIG. 1 and FIG. 2 in which the elliptical beads 4 are arranged was produced, and a cutting test was performed. Table 1 shows the test conditions.

This test result is expressed as an aspect ratio (d / D × 100 (%) using the minimum outer diameter d and the maximum outer diameter D) of the cylindrical beads 2 shown in FIG. 3 after the test (after cutting 10 m ² ). The results are shown in FIG.

  FIG. 4 shows an elliptical bead obtained by changing the angle θ formed between a perpendicular drawn to the elliptical bead 4 from a fulcrum where the elliptical bead 4 is in contact with the work material and the major axis of the elliptical bead 4. 4 is a test result when 4 is arranged, and when θ is 10 ° or more and 60 ° or less, the aspect ratio shows a good value. That is, the elliptical beads 4 effectively promote the rotation of the cylindrical beads 2 and realize a state in which there is almost no uneven wear of the cylindrical beads 2. In addition, it can be seen that the case where the elliptical beads 4 are not arranged has a lower aspect ratio than that where the elliptical beads 4 are arranged, and the partial wear proceeds.

FIG. 5 shows the result of investigating the life of the wire saw and the state of rotation of the cylindrical bead 2 by changing the ratio of the arrangement of the elliptical bead 4 to the cylindrical bead 2. In FIG. 5, the life index represents 100 as the life when 15 cylindrical beads 2 are arranged for one elliptical bead 4. The rotation index represents 100 as the amount of rotation when one cylindrical bead 2 is arranged for one elliptical bead 4.
When one cylindrical bead 2 is arranged for each elliptical bead 4, the effect of rotation is sufficiently obtained, but since the ratio occupied by the cylindrical beads 2 is small, the working area is reduced. The lifespan 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 50 cylindrical beads 2 are arranged with respect to one elliptical bead 4, the area occupied by the cylindrical beads 2 is large, so that the working area is large and the wear amount is reduced. Since the proportion occupied by the shaped beads 4 is small, sufficient rotation cannot be obtained, uneven wear occurs, and the service life is reduced. Moreover, the thing which does not arrange | position the elliptical bead 4 has a low autorotation index | exponent, and tends to generate | occur | produce uneven wear.
On the other hand, when the cylindrical beads 2 are arranged in the range of 3 to 30 with respect to one elliptical bead 4, both the life index and the rotation index are good.

  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 mode of arrangement | positioning of an elliptical bead. It is a figure for calculating | requiring the aspect-ratio of the worn cylindrical bead. Figure showing the test results when the elliptical beads are placed by changing the angle between the elliptical beads perpendicular to the elliptical beads from the fulcrum where they contact the work material and the major axis of the elliptical beads. It is. It is a figure which shows the result of having investigated the lifetime of a wire saw, and the condition of rotation of a cylindrical bead, producing a wire saw by changing the ratio of arrangement | positioning of the elliptical bead with respect to a cylindrical bead.

Explanation of symbols

1 Wire saw 2 Cylindrical bead 3 Wire 4 Oval bead 5 Perpendicular

Claims (4)

  Cylindrical beads having a circular cross section formed by adhering a superabrasive layer to the surface of a cylindrical base metal are arranged at intervals in the longitudinal direction of the wire, and an arbitrary number of the cylindrical beads are arranged. A wire saw characterized in that an elliptical bead having an elliptical cross section is arranged every time.   2. The wire saw according to claim 1, wherein the elliptical beads are arranged at intervals in the longitudinal direction of the wire by sequentially changing the direction of the major axis.   The angle formed by the perpendicular drawn to the elliptical bead from the fulcrum where the elliptical bead contacts the work material and the long axis of the elliptical bead sequentially changes in the range of 10 ° to 60 °. The wire saw according to claim 2, wherein the wire saw is arranged as described above.   The wire saw according to any one of claims 1 to 3, wherein the cylindrical beads are arranged at a ratio of 3 to 30 with respect to one of the elliptical beads.

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