JPH07299727A - Wire saw - Google Patents

Abstract

PURPOSE:To provide a wire saw which is used in cutting a stone or concrete structure, whose lifetime as a tool is prolonged, and with which noise generation during works can be lessened, by preventing diamond abrasive grains attached to base metal pieces arranged in the form of beads from slipping off under the processing. CONSTITUTION:Being tapered at an angle of 0-30deg. to the cutting direction, base metal pieces 2 are arranged at a certain spacing in the form of beads in such a way as stretching in the longitudinal direction of an endless soft wire rope 4, and by means of brazing, diamond abrasive grains 3 are attached to the base metal pieces 2 in a single layer or a plurality of layers, and thus a wire saw is accomplished which is fitted with cutting edges.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire saw used for cutting stones, concrete structures and the like.

[0002]

2. Description of the Related Art A base metal formed by embedding hard or ultra-hard particles, for example, diamond particles forming a cutting portion in a matrix metal, is formed into beads (beads) at regular intervals in the longitudinal direction of a wire rope. It is widely known that the wire saw is used for cutting stone materials, concrete structures and the like. (For example, JP-B-49-2231 and JP-B-51-38473) Also, beads in which hard particles are fixed on a base metal by an electroplating method, a chemical plating method or the like are widely known.

[0003]

Conventionally, the wire saw of the type in which the abrasive grains are embedded has been capable of continuous processing because the metal layer as the binder gradually wears out along with the damage and wear of the diamond. However, in order to improve the processing efficiency, the amount of diamond contained must be increased or high-strength abrasive grains must be used, leading to an increase in cost.

On the other hand, in the electrodeposition method, diamond is fixed on a base metal by Ni plating or the like, but the surface occupancy of the abrasive grains is extremely high because the laminated state of the abrasive grains is transferred as it is,
Since the average cutting edge interval is shortened, it was difficult to adjust this occupation rate.

Further, the contact angle between the diamond and the Ni plating is close to 180 °, the holding of the abrasive grains changes depending on the plating thickness, and the holding depends on the mechanical plating strength, and the holding becomes weak. The tool was likely to come off during machining, shortening the tool life.

Further, the conventional wire saw 11 is shown in FIG.
As shown in FIG. 1, a base metal part 1 in which beads 14 are arranged at predetermined intervals on a wire 14 covered with a plastic member 15.
The surface (cutting blade portion) of the bead portion 16 in which the abrasive grains 13 are fixedly formed in the metal matrix 17 of No. 2 is parallel to the traveling direction of the wire 14, and this is arranged at a constant interval. They were constantly subjected to intermittent impacts, which caused vibrations of the wire or the entire machine, resulting in the generation of noise and a reduction in the breaking strength of the wire.

[0007]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and improved retention of abrasive grains, prevention of vibration and noise, and extension of tool life. It is a thing. An endless and flexible wire rope, a bead-shaped base metal is provided along the longitudinal direction of the wire rope at a predetermined interval in a bead shape and having a taper (0 ° to 30 °) with respect to the cutting direction. This is to constitute a wire saw in which one or a plurality of layers of diamond grinding abrasive grains are fixed on the base metal fixed and arranged by the brazing method to form a cutting blade portion.

The above-mentioned base metal and diamond grain bonding are
Metals that generate carbides (for example, Cr, Ti, Zr, and others belonging to Groups 4a to 6a of the Periodic Table) or alloys are applied on a base metal, or abrasive grains are attached by dropping or the like, and the metal is applied in a vacuum That is, baking was performed in a reducing and neutral atmosphere.

[0009]

With the above-described structure, it is possible to directly bond diamond, which is originally difficult to bond, to a metal or alloy, and the interface between the diamond, the metal and the alloy is 0.
And a strong joint can be obtained.

By tapering the base metal part, the base metal part acts in a point-contact manner, and the impact is alleviated.
Further, because of the taper shape, the abrasive grains on the surface of the blade portion intensively act as a cutting edge, so that the degree of freedom in the average abrasive grain interval is high and a state with high processing efficiency can be made to appear. further,
The diamond is locally worn as it breaks and drops, but since it is taper-like, it can be replenished one after another to maintain its sharpness.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a partial vertical cross-sectional view of a wire saw applied to the present invention, in which the wire rope 4 is covered with rubber or a plastic member 5 as in the conventional wire saw. The base metal 2 is arranged in a bead shape along the longitudinal direction of the wire rope 4. The base metal 2 arranged in the form of beads has a taper angle α of 0 ° to 30 ° (not including 0 °) with respect to the cutting direction, and this taper angle α is preferably 3 °. The base metal 2 arranged in a bead shape having a taper angle α of ˜15 ° is a wire rope 4
It is lightly crimped by.

[0012] If the taper angle α of the base metal 2 arranged in a bead shape exceeds 30 °, the mold is likely to lose its shape and may cause abnormal wear as a tool. The diamond abrasive grains 3 embedded in the base metal 2 arranged on the beads are fixed by brazing onto the base metal 2 arranged in the form of beads having a taper angle α, and the protrusion of the abrasive grains 3 Height is 50% of abrasive grain size
Arrange so as to cover the above. Further, after the base metal 2 arranged on the beads is attached to the wire rope 4, the wire rope 4 is covered by injection molding of the plastic member 5 to prevent rust and friction.

[0013]

EFFECTS OF THE INVENTION The present invention can provide a wire saw having a high retention of diamond abrasive grains, a long life, and a long sharpness by being configured as shown in the above specific examples.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a main part of a wire saw showing an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view of a main part of a conventional wire saw.

[Explanation of symbols]

 1 wire saw 2 base metal 3 diamond abrasive grains 4 wire rope 5 plastic member 6 beads 7 matrix metal

Claims (4)

[Claims] 1. An endless flexible wire rope, a base metal arranged along the longitudinal direction of the wire rope at a predetermined interval in a bead shape, and a diamond grinding abrasive on the base metal arranged and fixed in the form of beads. A wire saw characterized in that one or more layers of particles are fixed by a brazing method to form a cutting blade portion. 2. An endless flexible wire rope, and a base metal having a taper angle with respect to the cutting direction at predetermined intervals in a bead shape along the longitudinal direction of the wire rope, and arranged in the bead shape. A wire saw, wherein one or a plurality of layers of diamond grinding abrasive grains are fixed on a base metal having a fixed taper angle by a brazing method to form a cutting blade portion. 3. An endless flexible wire rope, a taper angle of 0 ° to 30 ° (not including 0 °) with respect to the cutting direction at a predetermined interval in a bead shape along the longitudinal direction of the wire rope. A wire saw, wherein a base metal having the above is disposed, and a cutting blade portion made of diamond abrasive grains is formed on the base metal by a brazing method. 4. The base metal and the diamond abrasive grains are bonded together by applying a metal that produces carbide (for example, a metal belonging to Groups 4a to 6a of the Periodic Table such as Cr, Ti, Zr) or an alloy onto the base metal. The wire saw according to any one of claims 1 to 3, wherein the abrasive grains are attached by dropping or the like, and the abrasive grains are baked or brazed in a vacuum, a reducing atmosphere or a neutral atmosphere.