JPH08257834A - Diamond wire saw - Google Patents

Abstract

PURPOSE: To improve antifretting between each side strand by setting a contact angle between an outer layer element wire of the core strand and an outer layer element wire of the side strand to a prescribed value or less. CONSTITUTION: A diamond wire saw 1 comprises a steel wire 2 serving as the core wire, diamond sintered ring alternately integrally formed along a line direction relating to this steel wire 2 and a rubber-made ring-shaped spacer 4. A contact angle between an outer layer element wire 2a of a core strand 2A and an outer layer element wire 2b of a side strand 2b is set to 12 deg. or less, to improve antifretting property between the core strand 2A and the side strand 2B. The core strand 2A and the side strand 2B are formed ordinarily in a Z strand, to set a 15 to 35% diameter increasing factor of the core strand 2A relating to the side strand 2B. Since a constitutional member 4a of ring- shaped spacer 4 is interposed in a gap 2C between each side strand 2B, antifretting property between each side strand 2B is improved.

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 useful for dismantling concrete structures, cutting stones and the like.

[0002]

2. Description of the Related Art Diamond wire saws have a diameter of 150
It is wound between rollers of mm to 500 mm and rotates at a high speed of 20 to 30 m / sec under a load of 400 to 600 Kgf. Bending fatigue resistance is required for safety. In this respect, in the conventional diamond wire saw, the steel wire that is the core wire is 7 × 7 G / L, 7 × 19 G / Z, 7 × 19 B / Z, which is configured according to the specifications of the wire rope and the aerial rope. There is a problem that fatigue disconnection is likely to occur relatively early due to use. Then, this fatigue disconnection is a so-called fretting disconnection due to rubbing between the respective strands of the core strand and the side strands.

Regarding such fretting, the contact angle between the outer layer strands between the core strand and the side strands,
Focusing on the cross-sectional structure of the steel wire, with the steel wire in the above-mentioned conventional diamond wire saw, in the case of 7 × 7 G / L, as shown in Table 1 below, the number of times until cutting was tested. The result of the repeated bending fatigue test was about 1800 times. This has a wire diameter of 7 ×
Compared to the 19 type, it is thicker, receives a large bending stress, has a small diameter increase rate of 4.3% for the core strand, and has a closed structure with less gaps between side strands, so rubber or resin penetration from the gap between side strands This is because not only the above-mentioned rubbing by the core strand and side strands but also rubbing between side strands leads to early fatigue disconnection.

The result of the repeated bending fatigue test at 7 × 19 B / Z was about 49500 times as shown in Table 1 below. This is because the contact angle between the outer layer strands between the core strand and the side strands is 16 to 17 degrees, which is a point contact state, so early fatigue disconnection was caused by fretting disconnection due to rubbing between outer layer strands. Is. In addition, the diameter increase rate of the core strands is not sufficient at 11.3%, the rubber or resin infiltrate into the gaps between the side strands is poor, and rubbing between the side strands is also a factor. And the side strands have the same diameter and there is no gap between the side strands, so not only the core strand and the side strands rub against each other, but also the side strands rub against each other, which is related to the occurrence of early fatigue disconnection. are doing.

[0005]

The problem to be solved is to improve the fretting resistance between the core strand and the side strands and between the side strands, and as a whole, endure early fatigue breakage and have excellent bending fatigue resistance. To provide a diamond wire saw having properties.

[0006]

In order to solve the above-mentioned problems, in a diamond wire saw in which a steel sintered wire is used as a core wire and a diamond sintered ring and a ring spacer made of rubber or resin are alternately integrated, The steel wire is a tight open type and normally twisted, and the diameter increase rate of the core strand with respect to the side strand is 15 to 35% (preferably 25 to 30%). The contact angle between the outer layer strand of the core strand and the outer layer strand of the side strand is 12 degrees or less (desirably 7
Or less).

In the structure of the core strand in the present invention, the bending fatigue resistance is emphasized, and 1 + m + n (l =
1 to 4 pieces, m = 6 to 9 pieces, n = 12 to 15 pieces), and the side strand is 1 × 12 (3 /
9), w (19), etc. are parallel twisted. In the case of the Z twist cord, the twisting direction of the core strand and the side strand is
The core strand is Z twisted and the side strands are S twisted, and vice versa for S twisted cords. The bare steel wire used as the core wire is not limited to a bare steel wire, but may be a plated steel wire whose surface is plated with zinc, nickel, copper, brass or the like, or a stainless wire. In the case of rubber coating, preferably zinc plating,
It is good that it is plated with brass. In the case of brass plating, the Cu / Zn composition is preferably Cu: 60-75%, Zn: 25-40%.
When the ring-shaped spacer is made of rubber, the plated steel wire is preferably zinc or brass plated wire. And, when the diameter increase ratio of the core strand to the side strands in the present invention is less than 15%, the infiltration of rubber or resin into the gaps between the side strands is reduced, and the anti-friction between the side strands is reduced. Hinder the improvement of
If the diameter increase ratio exceeds 35%, the bending fatigue resistance decreases. Further, when the contact angle between the outer layer strand of the core strand and the outer layer strand of the side strand in the present invention exceeds 12 degrees, the fretting resistance between the core strand and the side strand is deteriorated.

[0008]

[Operation] The steel wire as the core wire in the diamond wire saw has a contact angle between the outer layer element wire of the core strand and the outer layer element wire of the side strand that is 12 degrees or less, so that the anti-flake property between the core strand and the side strand is Tingability is improved. Further, in the steel wire, the core strand and the side strand are normally twisted, and the diameter increase rate of the core strand with respect to the side strand is set to 15 to 35%. Since the member is interposed, the fretting resistance between the side strands is improved. As a result, the entire diamond wire saw withstands early fatigue breakage and exhibits excellent bending fatigue resistance.

[0009]

FIG. 1 shows an example of a diamond wire saw according to the present invention. The diamond wire saw 1 comprises a steel wire 2 as a core wire and a steel wire 2 which alternates along the line direction. The diamond sintered ring 3 and the ring spacer 4 made of rubber are integrated with each other.

In the steel wire 2, one core strand 2A and six side strands 2B are normally Z-twisted, and the outer strands 2a and side strands 2B of the core strand 2A are normally twisted.
The contact angle with the outer layer wire 2b is 6 degrees.

The core strand 2A is 1 + 6 + 12 (1 × 19), and the side strand 2B is parallel twisted 1 × 12 (3/9). Then, the diameter increase rate of the core strand 2A to this side strand 2B is set to 29.5%, and each side strand 2B is tightly twisted with the core strand 2A and there is a gap 2C between each side strand 2B. The resin member 4a, which is a constituent member of the ring-shaped spacer 4, is interposed in the gap 2C between each side strand 2B.

An example of detailed data of the steel wire 2 will be shown. Steel wire diameter: 4.76mm Diameter increase rate: 29.5% Cord twist pitch and twist direction: 37.0mm, Z Contact angle: 6 degrees Core strand diameter: 2.02mm Core strand center strand diameter: 0.48mm Core strand inner layer strand Diameter: 0.40 mm Core strand outer layer strand diameter: 0.37 mm Core strand inner layer twist pitch: 7.0 mm Core strand outer layer twist pitch: 14.0 mm Core strand inner layer twist direction: Z Core strand outer layer twist direction: Z side strand Diameter: 1.56mm Side strand inner layer strand diameter: 0.40mm Side strand outer layer strand diameter: 0.35mm Side strand inner layer twist pitch: 22.5mm Side strand outer layer twist pitch: 22.5mm Side strand inner layer twist direction: S Outer layer twist direction of side strand: S

Thereby, the outer layer wire 2a of the core strand 2A
Since the contact angle between the side strand 2B and the outer layer strand 2b is 6 degrees, the fretting resistance between the core strand 2A and the side strand 2B is improved. The core strand 2A and the side strand 2B are normally Z-twisted, and the diameter increase rate of the core strand 2A relative to the side strand 2B is set to 29.5%. Since the constituent member 4a is interposed, the fretting resistance between the side strands 2B is improved. The diamond wire saw 1 as a whole withstands early fatigue disconnection and exhibits excellent bending fatigue resistance. Furthermore, since the core strand 2A is 1 + 6 + 12 (1 × 19), it has a good straight line-shaped bending fatigue resistance. Moreover, since the side strands 2B are formed by parallel twisting of 1 × 12 (3/9), they contribute to the improvement of fretting resistance.

The following Table 1 shows the results of repeated bending fatigue tests, and the numerical values show the number of times until cutting. The steel wire diameters of the tested example of the present invention and the conventional products of Comparative Example 1 and Comparative Example 2 were 4.76 mm, and the outer diameter was 8 mm by integrating a rubber member on the surface. The test was carried out by hanging a steel wire on a roller having a diameter of 25 mm, attaching a weight of 40 kg to one end of the wire, and repeatedly pulling the other end of the wire diagonally downward.

Comparative Example 1 (7 × 7 G / L) Steel wire diameter: 4.76 mm Diameter increase rate: 4.3% Cord twist pitch and twist direction: 32.8 mm, Z contact angle: 6.3 degrees Core strand diameter: 1.68 mm Core strand diameter: 0.58mm Core strand outer layer strand diameter: 0.55mm Core strand outer layer twist pitch: 16.5mm Core strand outer layer twist direction: Z side strand diameter: 1.61mm Side strand center strand diameter: 0.55mm Outer layer strand diameter of side strand: 0.53mm Outer layer twist pitch of side strand: 16.5mm Outer layer twist direction of side strand: Z

Comparative Example 2 (7 × 19 B / Z) Steel wire diameter: 4.76 mm Diameter increase rate: 11.3% Cord twist pitch and twist direction: 32.3 mm, Z contact angle: 16.7 degrees Core strand diameter: 1.815 mm Core strand diameter: 0.415mm Core strand inner layer strand diameter: 0.35mm Core strand outer layer strand diameter: 0.35mm Core strand inner layer twist pitch: 7.0mm Core strand outer layer twist pitch: 14.0mm Core strand inner layer twist Direction: Z-strand outer layer twist direction: Z-side strand diameter: 1.63 mm Side strand center strand diameter: 0.35 mm Side strand inner layer strand diameter: 0.32 mm Side strand outer layer strand diameter: 0.32 mm Inner layer twist pitch: 7.0mm Outer layer twist pitch of the side strand: 14.0mm Inner layer twist direction of the side strand: S Outer layer twist direction of the side strand: S

[0017]

[Table 1]

As shown in Table 1, the number of cuts according to the present invention is at least about 1.
Has more than 5 times more and has excellent bending fatigue resistance.

[0019]

【The invention's effect】

A. According to claim 1, in the steel wire as the core wire in the diamond wire saw, the contact angle between the outer layer element wire of the core strand and the outer layer element wire of the side strand is 12 degrees or less, and therefore, between the core strand and the side strand. Improved fretting resistance. B. According to the above paragraph, the steel wire is formed by normally twisting the core strand and the side strands so that the diameter increase ratio of the core strand to the side strand is 15 to 35%. Since the constituent members of (1) are interposed, the fretting resistance between the side strands is improved. C. According to the above paragraph, the diamond wire saw as a whole has excellent bending fatigue resistance by withstanding early fatigue disconnection.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of a diamond wire saw according to the present invention, with a part cut away.

FIG. 2 is an enlarged sectional view taken along line (2)-(2) of FIG.

[Explanation of symbols]

 1 Diamond Wire Saw 2 Steel Wire 2A Steel Wire Core Strand 2B Steel Wire Side Strand 2C Side Strand Gap 2a Core Strand Outer Layer Element Wire 2b Side Strand Outer Layer Element Wire 3 Diamond Sintering Ring 4 Spacer 4a Spacer Components

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[Procedure amendment]

[Submission date] April 6, 1995

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0004

[Correction method] Change

[Correction content]

The result of the repeated bending fatigue test at 7 × 19 B / Z was about 49500 times as shown in Table 1 below. This is because the contact angle between the outer layer strands between the core strand and the side strands is 16 to 17 degrees, which is a point contact state, so early fatigue disconnection was caused by fretting disconnection due to rubbing between outer layer strands. Is. In addition, the diameter increase rate of the core strands is not sufficient at 11.3%, the rubber or resin does not easily penetrate through the gaps between the side strands, and rubbing between the side strands is also a cause .

Claims (1)

[Claims] 1. A diamond wire saw in which a diamond sintered ring and a rubber- or resin-made ring-shaped spacer are integrated alternately by using a steel wire as a core wire. In the steel wire, a core strand and side strands are normally twisted. In addition, the component of the ring-shaped spacer is interposed in the gap between the side strands formed by increasing the diameter increase ratio of the core strand relative to the side strands to 15 to 35%, and the outer strands of the core strand and the side strands A diamond wire saw having a contact angle with the outer layer element wire of 12 degrees or less.