JPH09155630A - Diamond wire saw - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow to fix diamond beads to a steel cord solidly, and prevent the invasion of a cutting dirt and the moisture, by fixing plural diamond beads at specific intervals, to the steel cord which is covered by a rubber or a resin beforehand. SOLUTION: To a steel cord covered by a rubber 4 beforehand, plural diamond beads 2 are fixed at specific intervals, and a flexible material 3 such as a resin or a rubber is provided as a spacer, between the diamond beads 2 respectively. As a result, clearances inside the steel cord 1 are filled by the rubber 4 perfectly, and not only the steel cord can be protected from a cutting dirt, but also the strength deterioration of the steel cord 1 resulting from a rust by the invasion of the moisture, and the friction between strands and raw wires can be reduced. In this case, the rubber 4 is preferable to be in a thin form.

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 used for cutting stones, concrete, building materials and the like.

[0002]

2. Description of the Related Art Conventionally, a diamond wire saw used for cutting stones, concrete, building materials, etc. is wound between rollers having a diameter of 150 to 500 mm and is subjected to a load of 20 to 100 kgf. Then 20 ~
Since it is used for cutting while rotating at a high speed of 30 m / sec,
Longer life is required from the viewpoint of safety and economy.

However, in order to achieve this long life, 1. Firmly fix the diamond beads that will serve as the cutting blade to the steel cord. 2. Protect the steel cord from contact with the object to be cut and intrusion of cutting sludge and water that cause rust on the steel cord. 3. Improve the strength of the joint part of the steel cord terminal for endlessness. 4. To improve the fatigue resistance of steel cords. It is considered important to meet the conditions such as.

6 and 7 are sectional views of a conventional diamond wire saw. FIG. 7 shows a rubber 3 or a resin for fixing a plurality of diamond beads 2 as cutting blades to a steel cord 1. A steel cord 1 is impregnated with the above-mentioned materials and coated to form a spacer for fixing each diamond bead. In FIG. 6, the metal cored bar 2a of the diamond bead 2 is directly fixed to the steel cord 1 by caulking and the steel cord 1 is impregnated with the rubber 3 or resin as a spacer to cover the steel cord 1.

[0005]

However, when rubber is used as the spacer, it has an advantage in that the strength of the spacer is inferior to that of the resin, although it is excellent in protecting the steel cord surface from cutting sludge and the like. . Moreover, the spacer is provided after inserting the diamond beads into the steel cord, so rubber is not impregnated into the steel cord directly below the diamond beads, and rust caused by water entering even from a minute gap and strands and It has the drawback that the friction between the wires cannot be reduced. Furthermore, when rubber is used as the spacer, although the adhesive strength to the steel cord is strong,
Because it is soft, the force to support the diamond beads is weak,
There is a problem that the diamond beads are not able to withstand the cutting work and are displaced from their original positions. Therefore, resin is used instead of rubber, but in the case of resin, contrary to the case of rubber, the adhesive force of resin to steel cord is weak, and diamond beads as well as rubber are used. There is a common problem that the supporting force is weak, the cutting work cannot be endured, and the diamond beads are displaced from their original positions.

On the other hand, when the metal core of diamond beads is directly fixed to the steel cord by caulking, the steel cord is strongly restrained by the metal core and is easily fatigued even though the fixing force is strong. There is a problem that the steel cord may break during the work, which is very dangerous. In that respect, not caulking
Fatigue resistance is improved when rubber or resin is used as a spacer, but on the other hand, the presence of diamond beads prevents the rubber from being sufficiently filled in the voids in the steel cord, and the friction between the wires that make up the steel cord is sufficient. However, there is a problem in that the fatigue cannot be prevented and eventually breaks.

[0007] Therefore, the present invention is to solve the above-mentioned problems.
It is an object of the present invention to provide a long-life diamond wire saw in which diamond beads are firmly fixed to a steel cord without intrusion of cutting sludge or water and yet fracture or damage due to fatigue does not occur.

[0008]

In order to solve the above-mentioned problems, the present invention fixes a plurality of diamond beads at a predetermined interval to a steel cord previously coated with rubber or resin,
The means is to dispose a flexible material such as resin or rubber between the diamond beads as a spacer.

Therefore, according to the present invention, the diamond beads are fixed to the steel cord coated with rubber or resin in advance, and a flexible material such as resin or rubber is arranged as a spacer between the diamond beads. The voids inside the steel cord are completely filled with rubber and resin, which not only protects from cutting sludge but also reduces the rust caused by the intrusion of moisture and the strength deterioration of the steel cord caused by the friction between strands and wires. It becomes possible to do.

In particular, when the surface of the steel cord is coated with rubber in advance, it becomes possible to adopt not only the rubber as the spacer but also a flexible material such as resin having a strength higher than that of the rubber, Diamond beads can be firmly fixed to the steel cord. Also, in this case, since the surface of the steel cord is previously coated with rubber, the damage of the steel cord caused by the pressure when the diamond beads are attached and the sleeve often used for the joint of the steel cord ends is attached is reduced. You can

Still another aspect of the present invention is that a metal core of diamond beads is fixed to a steel cord previously coated with rubber or resin by caulking. Therefore, since rubber or resin is present between the steel cord and the diamond beads, when the metal cored bar is fixed by caulking, the cored bar bites into the rubber or resin to firmly fix the diamond beads, and Since rubber and resin serve as cushioning materials, the fatigue resistance can be enhanced without impairing the flexibility of the steel cord.

Still another invention is that a metal core of diamond beads is fixed to a steel cord previously coated with rubber or resin by caulking, and a coil spring is arranged between the diamond beads as a spacer. That means. Therefore, the rigidity possessed by the coil springs exerts an action of pressing each diamond bead in the left-right direction, so that the diamond bead can be more firmly supported by the synergistic action with the caulking process of the metal cored bar. Moreover, it is cheap.

In still another invention, a metal core of diamond beads is fixed by caulking to a steel cord previously coated with rubber or resin, and a coil spring is arranged as a spacer between each diamond bead. The means is to fill the gap between the coil spring and the diamond beads with resin. Therefore, use steel cord coated with rubber or resin in advance,
The diamond beads can be more firmly fixed and the steel cords can be damaged by the synergistic effects such as the strong caulking of the metal core bar, the use of coil springs as spacers, and the filling of resin. Fatigue resistance, protection from cutting sludge, rusting due to intrusion of water, strength deterioration of steel cord due to friction between strands and strands, etc. can be solved at once.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a partially cutaway sectional view of a diamond wire saw showing an embodiment of the present invention, and FIG. 2 is an enlarged sectional view taken along line AA of FIG. In the figure, 1 is a steel cord formed by bundling a plurality of strands formed by twisting wire strands, 2 is a diamond bead that serves as a cutting blade, and 3 is a spacer made of a flexible material such as resin or rubber. In the embodiment, resin is used. 4 is a rubber coating, which fills the voids in the steel cord and is vulcanized and bonded. As a result, the adhesive force of the rubber is enhanced, water can be prevented from entering, and friction between strands and wire strands can be reduced. In the case of coating with rubber, the coating thickness t is set to 30 of the diameter D of the steel cord.
% Or less, it is preferable to form the thinnest possible film.
This is because when it exceeds 30%, the elasticity of rubber hinders the fixing of diamond beads and the fixing of spacers. Can be fixed firmly.

As described above, according to the present invention, a plurality of diamond beads 2 are fixed at a predetermined interval to a steel cord coated with rubber 4 in advance, and between the diamond beads,
A flexible material 3 such as resin or rubber is provided as a spacer. As a result, the voids inside the steel cord are completely filled with rubber, which not only protects from cutting sludge, but also rusts due to the ingress of moisture and the strength deterioration of the steel cord due to friction between strands and wires. It is possible to reduce.

FIG. 3 shows another embodiment, in which a metal cored bar 2a of a diamond bead 2 is fixed by caulking to a steel cord 1 coated with a rubber 4 in advance. A spacer 3 made of a flexible material such as resin or rubber is made of resin in the embodiment. As a result, since a thin rubber coating is interposed between the steel cord and the diamond beads, when the metal cored bar 2a is fixed by caulking, the cored bites into the rubber to firmly fix the diamond beads, and Since rubber serves as a cushioning material, the fatigue resistance can be increased without impairing the flexibility of the steel cord. In the present embodiment, an example in which one end of the metal cored bar 2a is fixed by caulking has been shown, but the other end of the metal cored bar 2a is extended and both sides of the metal cored bar are caulked. , The diamond beads can be fixed more firmly.

FIG. 4 shows still another embodiment, in which a metal cored bar 2a of a diamond bead 2 is fixed by caulking to a steel cord 1 coated with a rubber 4 in advance, and between each diamond bead. The coil spring 5 is arranged as a spacer. As a result, the rigidity possessed by the coil spring exerts an action of pressing each diamond bead in the left-right direction, so that the diamond bead can be more firmly supported by the synergistic action with the caulking process of the metal cored bar. Moreover, since a coil spring is used, installation is easy and inexpensive. Furthermore,
When the spacer is a coil spring and the resin 3a is filled in the gap between the coil spring and the diamond beads, the steel cord coated with rubber is used in advance, the metal core can be firmly caulked, and the coil spring is used as the spacer. The diamond beads can be more firmly fixed by the synergistic effect of filling resin, etc., and at the same time, damage to the steel cord, fatigue resistance, protection from cutting sludge, rust due to water intrusion, strands and strands It is possible to solve the conventional problems such as the strength deterioration of the steel cord due to the fretting between the lines at once.

In the above embodiment, when the steel cord is coated with rubber, it is preferable that the steel cord is previously plated with brass or zinc, or copper or an alloy containing zinc as a main component. As a result, the vulcanization reaction is promoted, and the adhesion between the steel cord and the rubber can be further enhanced.

Furthermore, in the above-described embodiment, an example in which a steel cord coated with rubber in advance is used has been described. However, even if the resin is coated in advance instead of coating with rubber, the metal cored bar is caulked. By appropriately combining the spacer of the coil spring, the filling of the resin, and the like, it is possible to obtain the same effect as that of the steel cord coated with rubber in advance. However, in this case, unlike the case of coating the rubber, it is possible to omit the brass plating, the zinc plating, or the alloy plating containing copper or zinc as a main component in advance on the steel cord.

As an example, 7 strands formed by twisting 19 wire strands are bundled, and a diameter D =
Brass plated on 4.76mm steel cord,
When the inside of the cord was filled with vulcanized rubber and the cord surface was covered with a rubber having a thickness of 0.4 mm and a fatigue strength comparison test was conducted, the results shown in FIG. 5 were obtained.

In FIG. 5, the upper part shows that the diamond wire saw having the structure shown in FIG. 1 is suspended on a plurality of sheaves, one end is fixed, and a load of 250 kg is applied to the other end.
It is the result of measuring the fatigue property up to fracture by repeatedly reciprocating as shown by the arrow in the figure. According to this result, the rubber coated with the rubber of the present invention shown as an example has about twice as much durability as the conventional rubber coated with a rubber as shown in FIG. I understand.

The lower part of FIG. 5 shows a comparison of the durability time when the joint portion of the steel cord end is joined with a sleeve to make the diamond wire saw endless, and it is shown between the drive sheave and the tension sheave. A diamond wire saw was wound and a load of 70 kgf was applied to the tension sheave side to measure the endurance time until rupture. As shown in FIG. It can be seen that the durability is about twice as high as that of the conventional one which is not covered with various rubbers.

[0023]

As described in detail above, according to the present invention, the diamond beads are fixed to the steel cord coated with rubber or resin in advance, so that cutting sludge and water are prevented from entering and the diamond beads are attached to the steel cord. It is firmly fixed. Moreover, the fatigue resistance is improved, and there is no breakage or damage due to fatigue even when repeated stress is applied, so that a long-life diamond wire saw can be obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view of a wire saw showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view of a wire saw showing another embodiment of the present invention.

FIG. 4 is a sectional view of a wire saw showing another embodiment of the present invention.

FIG. 5 is an explanatory diagram of a fatigue test in the present invention.

FIG. 6 is a sectional view of a conventional wire saw.

FIG. 7 is a sectional view of a conventional wire saw.

[Description of sign]

1 Steel cord 5 Coil spring 2 Diamond beads 2a Metal core 3 Spacer 3a Resin 4 Rubber coating

Claims (4)

[Claims] 1. A plurality of diamond beads are fixed at predetermined intervals to a steel cord coated with rubber or resin in advance, and a flexible material such as resin or rubber is arranged as a spacer between the diamond beads. A diamond wire saw that is characterized. 2. The diamond wire saw according to claim 1, wherein a metal core of diamond beads is fixed by caulking to a steel cord previously coated with rubber or resin. 3. The diamond wire saw according to claim 1, wherein a metal core of diamond beads is fixed by caulking to a steel cord previously coated with rubber or resin, and a coil spring is provided between the diamond beads. A diamond wire saw that is arranged as a spacer. 4. The diamond wire saw according to claim 1, wherein a metal core of diamond beads is fixed by caulking to a steel cord previously coated with rubber or resin, and a coil spring is provided between the diamond beads. A diamond wire saw, wherein the diamond wire saw is provided as a spacer and is filled with resin in the gap between the coil spring and the diamond beads.