JPH068039A - Diamond wire saw and manufacture thereof - Google Patents

Abstract

PURPOSE:To provide a diamond wire saw low in frictional resistance, excellent in wear and heat resistance and reinforced in fixing force between a sleeve and diamond beads. CONSTITUTION:In the manufacturing process of a diamond wire saw, a steel sleeve 1, on the surface of which plural plated layers 5 formed of not less than two kinds of metal are previously formed, is fitted into diamond beads 2 and sintered to be rigidly fixed. The sleeve 1 is then passed through with a steel wire 3, and caulked at fixed spaces so as to be fixed to the wire 3, and then the molding of a spacer 4 is performed using fluorocarbon resin in the fused state. In this case, the molding time temperature of the spacer 4 is to be not lower than the fusing temperature of an alloy formed at the plated layer as the result of sintering-fixing and lower than the liquid phase generating temperature in the diamond beads 2.

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, etc. and a method for manufacturing the same.

[0002]

2. Description of the Related Art A diamond wire saw (hereinafter abbreviated as "wire saw") is an endless wire having diamond beads embedded with diamond abrasive grains fixed thereto, which is used for cutting an object to be cut and a motor-driven pulley. Stones and concrete are cut by rotating between them.

The structure of a wire saw is shown in FIG. Diamond abrasive grains are embedded in the hollow cylindrical diamond beads 2, and the hollow cylindrical sleeve 1 made of steel is fitted and sintered and fixed therein.

Further, the sleeve 1 is fixed to the wire 3 by squeezing the sleeve 1 after arranging the sleeves 1 passed through the steel wire 3 at regular intervals. Further, the space between the diamond beads 2 is covered with a spacer 4 made of a flexible material such as thermoplastic resin or rubber. In this case, the diameter of the spacer 4 is equal to or smaller than the diameter of the diamond beads 2. .

[0005]

However, in the case of the resin or rubber used for the spacer 4 in the above-mentioned conventional wire saw, since the friction coefficient is relatively large, the surface temperature of the resin or the rubber is increased due to the friction with the object to be cut. Since the temperature rises easily and the heat resistance is low, it was necessary to constantly cool it with cooling water or the like when using the wire saw. Further, the spacer 4 is easily worn, and the resistance applied to the wire saw during use is increased, resulting in a problem that the life of the wire saw is shortened.

On the other hand, in the case of manufacturing the above-mentioned conventional wire saw, when the sleeve 1 is caulked to the wire 3, internal stress is generated in the fixing portion between the sleeve 1 and the diamond beads 2 due to the plastic deformation of the sleeve 1. It was a cause of a decrease in the adhesive strength between the two. In particular, if the internal stress is large, a crack may occur between the sleeve 1 and the diamond bead 2, and as a result, there is a problem that the fixing force between the two is further reduced.

[0007]

The present invention has been made in view of the above circumstances, and a steel sleeve is fixed to the outer circumference of a steel wire at regular intervals, and a diamond abrasive grain is attached to the outer circumference of the sleeve. Hollow cylindrical diamond beads are embedded in the wire saw, and a wire saw in which the diamond beads are covered with a spacer made of fluororesin is double-plated on the surface in advance by copper plating and tin plating. After the layered sleeve is fitted into the diamond beads and fixed by sintering, the sleeve is passed through the wire and caulked at fixed intervals to be fixed to the wire, and further, the space between the sleeves is covered with a molten fluororesin. And a method for manufacturing the same.

[0008]

In the wire saw of the present invention, since the spacer is made of a fluororesin having an extremely small coefficient of friction and excellent heat resistance, the friction force generated at the contact point with the object to be cut when the wire saw is cut is reduced. The spacers are less likely to be heated, and as a result, the cooling work during use of the wire saw is simplified. Further, since the resistance applied to the wire during the cutting operation is reduced, the wear resistance and life of the wire saw are extended.

Further, in the wire saw manufacturing method of the present invention, the spacers are formed by coating the space between the sleeves with a molten fluororesin, so that only the plating layer alloyed on the surface of the sleeves during sintering and fixation is formed. Melts as the spacer is molded and diffuses into the fixing portion between the sleeve and the diamond beads, and as a result, the stress generated in the fixing portion in the caulking step is relaxed.

In addition, even if a crack is formed in the fixing portion due to the stress, the crack is filled with the plating layer, so that a decrease in the fixing force between the sleeve and the diamond beads can be prevented.

[0011]

Embodiments of the present invention will now be described in more detail with reference to the drawings. Since the wire saw of the present invention has the same shape as that shown in FIG. 5 described above, FIG. 5 will be used together in the following description and the description thereof will be omitted.

In the wire saw of the present invention, the diamond beads 2 are made of copper, tin, and cobalt, respectively.
%, 10%, and 70% by weight of a metal mixture containing diamond abrasive grains having a particle size of 40 mesh at a volume ratio of 10%.
%, The mixture is cold-pressed at a pressure of 3 ton / cm ³ and then molded into a hollow cylindrical shape, and two vertically stacked layers are used.

On the other hand, on the surface of the sleeve 1, a plating layer 5 having a two-layer structure in which tin plating is applied on copper plating
Are formed. The total thickness of the plating layer 5 is 40 μm, and the thickness ratio of the plating layer 5 is copper 9: tin 1
It is a ratio of.

Next, a method of manufacturing the wire saw having the above structure will be described with reference to FIGS. Figure 1
The state where the sleeve 1 is fitted into the diamond beads 2 is shown. In the state of FIG. 1, the sleeve 1 and the diamond beads 2 are sintered and fixed. As a result, both the metal mixture forming the diamond beads 2 and the plating layer 5 are melted to form an alloy. In the case of the present embodiment, the temperature at the time of sintering fixation is 600 ° C to 900 ° C.
And

FIG. 2 shows a state in which the steel wires 3 are passed through the sleeve 1 after the diamond beads 2 have been sintered and fixed and arranged at equal intervals. Here, as the material of the wire 3, for example, stainless steel is used. Further, as shown in FIG. 3, the sleeve 1 is caulked from the periphery thereof and the diamond beads 2 are fixed to the wire 3.

Thereafter, as shown in FIG. 4, the diamond beads 2 are sequentially covered with a molten fluororesin by a method such as injection molding, and spacers 4 made of a fluororesin are formed between the diamond beads 2. Let In this case, the temperature at the time of spacer molding 4 is 350 ° C. or higher, which is the melting temperature of the alloy formed on the plating layer 5, and is lower than the liquid layer generation temperature of the alloy formed on the diamond beads 2.

As a result, only the alloy formed on the plating layer 5 is melted and diffused on the surface of the sleeve 1, so that the internal stress generated in the fixing portion in the caulking step is relaxed and the gap between the sleeve 1 and the diamond beads 2 is reduced. It is possible to prevent a decrease in the sticking force. In particular, even when a crack is formed in the fixed portion due to the stress, the crack formed by the inflow of the alloy formed in the plating layer 5 reduces the fixing force between the sleeve 1 and the diamond bead 2. There is nothing to do.

The heating conditions for forming the spacers in this embodiment are preferably 400 ° C. and 3 hours.
According to the melting point of the fluororesin used, the value should be as close as possible to the above conditions. Further, after forming the spacer 4, the spacer 4 is cooled to complete the wire saw.

[0019]

As described above, in the wire saw of the present invention, since the fluorine resin having a very small coefficient of friction and excellent heat resistance is used as the spacer in the step of sintering and fixing the sleeve and the diamond beads, In addition to improving the wear resistance of the spacer, the resistance applied to the entire wire during cutting is reduced, the life of the wire saw is extended, and the rise in the surface temperature of the wire caused by friction with the object to be cut is suppressed. In addition, since the fluororesin has high heat resistance, it is possible to simplify the cooling work while using the wire saw.

Further, in the wire saw manufacturing method of the present invention, since the spacers are formed by coating the space between the sleeves with a molten fluororesin, only the plated layer alloyed on the surface of the sleeve is dissolved. Diffuse to the fixed part of the sleeve and diamond beads, as a result,
The stress generated in the fixed portion in the crimping step is relaxed, and even when a crack is formed in the fixed portion due to the stress, the crack is filled with the plating layer, so that the sleeve and the A decrease in the adhesive strength between diamond beads is prevented.

[Brief description of drawings]

FIG. 1 is a diagram showing a state in which a sleeve and diamond beads are fixed to each other in the manufacturing process of the diamond wire saw according to the first embodiment of the present invention.

FIG. 2 is a diagram showing a state in which the sleeves are passed through the wires and arranged at equal intervals in the manufacturing process of the diamond wire saw according to the first embodiment of the present invention.

FIG. 3 is a diagram showing a state in which the sleeve is crimped and fixed to the wire in the manufacturing process of the diamond wire saw according to the first embodiment of the present invention.

FIG. 4 is a view showing a state during spacer molding in the manufacturing process of the diamond wire saw according to the first embodiment of the present invention.

FIG. 5 is a vertical cross-sectional view showing the structure of a diamond wire saw.

[Explanation of symbols]

 1 Sleeve 2 Diamond beads 3 Wire 4 Spacer 5 Plating layer

Claims (4)

[Claims] 1. A steel sleeve is fixed to the outer circumference of a steel wire at regular intervals, hollow cylindrical diamond beads in which diamond abrasive grains are embedded are fixed to the outer circumference of the sleeve, and the diamond is used. A diamond wire saw characterized in that the beads are covered with a spacer made of a fluororesin. 2. A sleeve having a double plated layer made of copper plating and tin plating formed on the surface of the diamond beads is fitted and sintered and fixed, and the sleeve is passed through the wire and crimped at regular intervals. The method for producing a diamond wire saw according to claim 1, wherein the spacers are formed by fixing between the diamond beads and the diamond beads with a molten fluororesin after fixing the spacers to the wires. 3. The method for manufacturing a diamond wire saw according to claim 2, wherein the spacer is formed by injection molding. 4. The method of manufacturing a diamond wire saw according to claim 2, wherein the thickness ratio of the plated layer is a ratio of copper 9: tin 1.