JPH09295222A - Diamond beads for diamond wire saw - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the cutting efficiency and lifetime of a tool by forming a groove having torsion in the direction opposite to the wire twisting direction of a wire core material in the inner periphery of a seating so as to eliminate the generation of positional displacement of a diamond beads in relation to any direction of the circumferential direction and the axial direction of the wire core material. SOLUTION: In a cutting process for cutting the material to be cut, diamond beads are rotated in the twisting direction of the wire core material 3 and while moved around the material to be cut. At this stage, since a coating layer 4, which is pressed in between the inner periphery of the seating 1 and the wire core material 3, is filled into a groove 1b, rotation of the seating 1 around the wire core material 3 is restricted. Since the groove 1b is formed spiral in the direction opposite to the twisting direction of the wire core material 3, the groove 1b and a wire of the wire core material 3 cross each other in the axial direction of the seating 1, and the movement of the seating 1 in the axial direction of the wire core material 3 is restricted, and positional displacement of the seating 1 in relation to the movement of the wire core material 3 is hard to be generated, and safety is maintained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a diamond wire saw for cutting stones, concrete, building materials and the like, and particularly good cutting of diamond beads without rotating around the wire core and abnormal diamond beads. The present invention relates to a configuration capable of suppressing early wear.

[0002]

2. Description of the Related Art A diamond wire saw is disclosed, for example, in Japanese Utility Model Publication No. 5-24413.
A diamond layer is provided on the outer peripheral surface of a substrate having an annular cross section into which a wire can be inserted, the diamond layer being formed by electrodeposition or metal sintering. The diamond beads are arranged on the wire core material at regular intervals, and a rubber material (NBR, SBR, etc.) or a thermoplastic resin material such as polyurethane is provided between the diamond beads and the wire core material for firm attachment. Is intervening.

However, during cutting, an impact may be applied to the diamond beads to cause them to shift from their predetermined fixed positions, or the diamond beads may rotate in the circumferential direction.
As a result, abnormal early wear of the diamond beads may occur, or the wire core material may wear due to contact with the inner surface of the diamond beads, resulting in breakage of the wire core material.

On the other hand, Japanese Examined Patent Publication No. 7-22886 discloses a structure in which the diamond beads are prevented from rotating around the wire core material.

FIG. 5 shows a diamond bead described in this publication, and as shown in the figure, a diamond layer 52 is formed around a base body 51 into which a wire core material is inserted. Then, a total of four groove grooves 53 are formed in the inner peripheral surface of the base body 51 in the axial direction.

If such grooves 53 are provided, it is possible to fill a synthetic resin for mounting at the time of injection molding with a resin between these grooves and the wire core material. Is firmly fixed to the wire core material, and the positional deviation and the like can be effectively prevented.

[0007]

The groove 53 is formed in the base 51.
Since it runs parallel to the axis of the wire core material, it is possible to confront these wire grooves 53 with the peripheral surface of the wire core material at four locations in the circumferential direction of the wire core material, and the synthetic resin to be filled also Restrain the core material at four locations in the circumferential direction. Therefore, the base body 51 is similarly constrained by the filling synthetic resin at the four inner peripheral surfaces thereof, and a constraining force in the circumferential direction can be applied between the base body 51 and the wire core material.

However, although the rotation of the base body 51 can be suppressed by the restraining force in the direction in which the base body 51 rotates around the wire core material, the restraining force in the axial direction cannot be expected so much. Therefore, when the cutting speed, that is, the moving speed of the base body 51 in the axial direction is high, a positional deviation may occur with respect to the wire core material, leading to early wear of the diamond beads, shortening the life, and reducing the wire core material. Accidents such as cutting may occur.

As described above, the conventional diamond beads cannot reliably prevent the positional deviation with respect to the wire core material, so that there is a problem that the efficiency of the cutting work and the life of the tool itself cannot be avoided.

The problem to be solved in the present invention is to improve the cutting efficiency and the tool life by preventing the diamond beads from being displaced in both the circumferential direction and the axial direction of the wire core material.

[0011]

DISCLOSURE OF THE INVENTION The present invention provides a diamond bead having a base metal which is inserted through the wire core material and fixed together with the coating material, in which the wire twisting direction of the wire core material is provided on the inner circumference of the base metal. It is characterized by forming a groove having a twist in the opposite direction.

[0012]

1 is a schematic vertical sectional view showing an example of a diamond bead of the present invention.

The diamond beads are composed of a hollow cylindrical base metal 1 and an abrasive material layer 2 fixed to the outer peripheral surface thereof. As shown in FIG. 2, the wire core material 3 is passed through the base metal 1, and It has a structure in which a coating layer 4 of a rubber material or a thermoplastic resin is integrally joined. And, the inner peripheral surface of the base metal 1 is engraved with a groove that draws a spiral.

The groove 1a of the base metal 1 shown in FIG. 1 (a) is
The wire core material 3 is adapted to the case of so-called Z twist, and the groove 1b of the base metal 1 shown in (b) of the figure is adapted to the case where the wire core material 3 is the so-called S twist. is there. These line grooves 1a and 1b may be a plurality of lines on the inner circumference of the base metal 1, or may be provided with only one line. Further, although the line grooves 1a and 1b are carved in the entire length of the base metal 1 in the axial direction in the illustrated example, it is also possible to form recesses intermittently in the direction of the line.

The wire core material 3 shown in FIG. 2 has S twist,
For this, the diamond beads of FIG. 1 (b) are used. That is, the wire core material 3 formed by bundling and twisting a large number of wires is an assembly of these wires that are twisted in a spiral shape, and in the case of the S twist, one wire is used as shown in FIG. The shape is such that one wire has a slant toward the left. On the other hand, in the diamond bead of FIG. 1B, the groove 1b of the base metal 1 has a reverse inclination, and the twisting posture of the wire of the wire core material 3 and the groove 1b.
The posture is opposite to that of.

In the process of cutting the work material, the diamond beads move around the work material while rotating in the twisting direction of the wire core material 3. At this time, since the coating layer 4 of synthetic resin or the like press-fitted between the inner circumference of the base metal 1 and the wire core material 3 is filled up to the inside of the groove 1b, the base metal around the wire core material 3 is filled. The rotation of 1 is suppressed. Since the groove 1b is spiral and the twisting direction is opposite to the twisting direction of the wire core material 3, the groove 1b and the wire of the wire core material 3 intersect in the axial direction of the base metal 1. Have a relationship to Therefore, the base metal 1 is also restrained in the movement of the wire core member 3 in the axial direction, and the base metal 1 is stably held even when the wire core member 3 is moved without displacement.

[0017]

EXAMPLE FIG. 3 is a more specific example of the diamond beads of the present invention. (A) of the figure is a front view seen from the axial direction, and (b) of the figure is A of (a) of the figure. FIG. 6 is a sectional view taken along the line A-A.

The illustrated example is to be attached to the Z-twisted wire core material 3 shown in FIG. 4. As shown in FIGS. 1 and 2, the diamond beads are the base metal 1 and the abrasives fixed to the peripheral surface thereof. The coating layer 4 made of synthetic resin or rubber is integrally joined together with the wire layer 3 including the material layer 2. Further, four groove grooves 1a of the base metal 1 are carved in the entire length in the axial direction as a twisting direction opposite to the twisting direction of the wire of the wire core material 3. By providing such a groove 1a, as described above, rotation around the wire core material 3 is prevented, and at the same time, due to the twisting direction of the wire core material 3 and the intersection of the groove 1a, The base metal 1 is also constrained in the axial direction via the coating layer 4 filled in between. Accordingly, even when the wire core material 3 travels around the work material, there is no rotation and positional deviation in the axial direction, uneven wear of the abrasive layer 2 is suppressed, and efficient cutting is maintained. .

Here, the outer diameter of the abrasive layer 2 is 11 mm, the inner diameter of the base metal 1 is 5.2 mm, the width of the groove 1a is 1 mm and the depth is 0.5 mm, and the inclination angle of twist is 30 °. A diamond bead, which was attached to a wire core material 3 having a diameter of 5 mm, was produced. Then, a rubber wire material was used as the coating layer 4, and a diamond wire saw was manufactured in which the interval between the bases 1, that is, the pitch interval of the diamond beads was 30 mm.

On the other hand, it is the same size as the
As described in JP-A-228886, a diamond wire saw using diamond beads in which the groove was carved as a straight line without twist in the axial direction was formed, and comparison was performed under the following conditions.

Cutting conditions: (1) Cutting machine: Original Machinery-2W-HD20 type (2) Wire saw circumference: 21.69 m (3) Wire saw moving speed: 1600 m / min (4) Work material: Tianshan granite (5) Cutting speed: 2.0 square meters / hour The results obtained by this comparative test are as shown in Table 1 below.

[0022]

[Table 1] As can be seen from the test results, the diamond beads to which the present invention is applied have a life of 40% or more longer than that of the comparative example. Further, it was confirmed that the number of displacements of the base metal was not at all the example product of the present invention as compared with 21 of the comparative example, and the fixing force of the base metal to the wire core material was significantly improved.

[0023]

The present invention has the following effects.

(1) The diamond beads do not rotate or shift with respect to the impact during cutting, and stable sharpness can be obtained.

(2) Since the diamond beads are firmly fixed without rotation or displacement, the tool life is improved.

(3) There is no deviation of the diamond beads,
Since the wire core material is not damaged, there is no cutting of the wire core material.

(4) Since the diamond beads do not rotate or shift, a high load can be endured, and high-speed cutting and work efficiency can be improved.

[Brief description of drawings]

FIG. 1 is an example of diamond beads used in the wire saw of the present invention, where (a) of the figure is for a Z-twisted wire core material and (b) is for an S-twisted wire core material. It is a longitudinal cross-sectional view of an example.

FIG. 2 is a vertical cross-sectional view of a main part showing an example in which the diamond beads of FIG. 1 (b) are attached to a wire core material.

FIG. 3 is an example of a diamond bead for a Z-twisted wire core material, where (a) of the figure is a front view seen in the axial direction, and (b) of the figure is A of the same figure (a). FIG. 6 is a vertical sectional view taken along the line A-A.

FIG. 4 is a vertical cross-sectional view showing a main part of a diamond bead wire saw in which the diamond beads of FIG. 3 are attached to a wire core material.

FIG. 5 is a vertical cross-sectional view showing a conventional example of diamond beads.

[Explanation of reference numerals] 1: Base metal 2: Abrasive layer 3: Wire core material 4: Covering layer

[Table 1] Tool life

Claims (1)

[Claims] 1. A diamond bead comprising a base metal which is inserted through a wire core material and fixed together with a coating material, wherein a strip having a twist opposite to a wire twisting direction of the wire core material is provided on an inner circumference of the base metal. Diamond beads in a diamond wire saw formed with grooves.