JP2002046071A - Segmented structure of diamond blade - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a segmented structure of a stable and sharp diamond blade without shortening its service life, in solving the problems of the initial sharpness and the grain replacement of a diamond blade product. SOLUTION: Grains approximately equal in diameter to diamond abrasives and having a Knoop hardness of 2500 Kg/mm2 or less at room temperature, made from a material with a melting point higher than a temperature for baking segment chips 2 mounted to the outer periphery of a disc-shaped stock 1, are buried in a cutting surface on the outer periphery of each diamond chip 2 up to a depth that is 1 to 3 times the grain diameter, as measured from the surface of the cutting surface. The ratio of the number of diamond abrasives to that of grains buried is from 2:1 to 1:4. The grains buried are geometrically arranged in this ratio on the outer peripheral surface of each segment chip.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a diamond blade segment structure used for cutting concrete, asphalt, stone and the like.

[0002]

2. Description of the Related Art Diamond blades used in these applications have a structure in which segment chips are attached to the outer periphery of a sour disk. When cutting concrete or hard stone with reinforced steel, the table or mond abrasive is subject to impact. Deterioration is caused by heat and heat, and the cutting edge is dulled to lower the sharpness.

In order to maintain the sharpness, when the binder holding the diamond abrasive material is worn, the deteriorated diamond abrasive material falls off, and the diamond in the segment chip newly appears. It is necessary that the change be repeated.

[0004] Generally, the ratio of undeteriorated perfect abrasive, crushed or worn abrasive, and dropped abrasive that acts as a cutting edge in a normal change is 1: 1: 1.

[0005] When new, the binder is forcibly removed with a grinder or the like to expose the diamond, so that the percentage of completely abrasive grains is greater than after replacement. For this reason, when new, the force applied to the abrasive grains is dispersed, and if cutting continues, the diamond abrasive material will be crushed or worn, but it will not fall off, and a lot of deteriorated abrasive material will remain on the surface, a so-called blind state And the sharpness may not last.

Conventionally, the following has been proposed. JP-A-64-45574 discloses that particles having a particle size substantially the same as diamond, such as alumina and silicon carbide, are 5 to 40 particles.
It is disclosed to add% by volume. JP 9-10
Japanese Patent No. 3916 discloses that graphite particles of up to about 100 μm are added. Patent No. 2994466
The specification discloses that a polishing segment containing superabrasive grains and a segment not containing superabrasive grains are partitioned and attached, and that a second abrasive other than the superabrasive grains is included. Neither invention pays attention to the outer peripheral surface of the abrasive layer, but is an object different from the adjustment of the number of abrasives in the outer peripheral portion of the present invention, and has no effect on the adjustment of the number of abrasives in a new initial stage.

In order to reduce the number of abrasive grains with emphasis on sharpness, the concentration of the entire segment chip (the ratio of diamond contained in the segment chip: the concentration of 100 when the volume of diamond is 25% of the volume of the segment chip) Lowering the number of abrasive grains, the life of the blade is impaired.

In the case of a blade that emphasizes the life, it is necessary to increase the number of abrasive grains. However, when a new article is used, the binder is forcibly removed with a grinder or the like to expose the diamond. More than. For this reason, the force applied to the abrasive grains is dispersed, and if the cutting is continued, the crushing and wear of the diamond abrasive material progresses, but the diamond abrasive material does not fall off, and a lot of deteriorated abrasive material remains on the surface, so-called blind state, sharpness Failure is a problem.

[0009]

SUMMARY OF THE INVENTION An object of the present invention is to solve the problem of sharpness and replacement when a diamond blade is new, and to provide a diamond blade having a stable sharpness without shortening its life. It is to provide a segment structure.

[0010]

In order to solve the above-mentioned problems, a segment structure according to the present invention is characterized in that a cutting action surface on an outer periphery of a segment chip has a diameter substantially the same as that of a diamond abrasive and has a melting point higher than a temperature at which the segment chip is fired. Is characterized by embedding particles having a Knoop hardness of 2500 kg / mm ² or less at room temperature and having a Knoop hardness of 1 to 3 times the particle diameter from the surface of the cutting action surface.

The ratio of the number of the diamond abrasive and the number of the particles to be embedded on the outer peripheral surface of the segment chip is 2: 1 to 1: 4.
And

By arranging the particles to be embedded geometrically on the outer peripheral surface of the segment chip at the ratio described above, the diamond abrasive can be effectively dispersed. The depth at which the particles are embedded depends on the conditions of use, but it depends on the diamond abrasive grain.
You can change within three times.

As a result, the number of perfect abrasive grains does not become excessively high when new, and good sharpness can be obtained. In addition, the particles in the segment chips are worn first, and the force acting on the diamond abrasive increases, so that the sharpness is improved and the deteriorated diamond is changed smoothly.

[0014]

Embodiments of the present invention will be described below with reference to embodiments shown in the drawings. FIG. 1 is an enlarged view showing an outer peripheral surface of an embodiment of a segment tip structure of a diamond blade according to the present invention, wherein 1 is a disk-shaped steel base, 2 is a segment tip, and 3 is an embedded particle. FIG. 2 shows a length of 47 mm and a width of 3.3 mm attached to the outer periphery of a disc-shaped steel base 1 having a radius of 355 mm.
Examples of three modes (a), (b) and (c) in which particles 3 are embedded in a segment chip 2 having a height of 10 mm and a height of 10 mm are shown.

In this embodiment, the segment chip 2 is made of a metal bond having a degree of concentration of 30, and spherical carbon is fixed thereon as particles 3 at a depth of one particle from the outer periphery. (A)
In the case of, the particles 3 were arranged so as to be perpendicular to the rotation direction of the blade. In the case of (b), the particles 3 were arranged at regular intervals. In the case of (c), they were arranged so as to form oblique lines from the center in the thickness direction to the side surfaces.

[0016]

EXAMPLE As a result of cutting concrete of the present example and the comparative example under the following cutting conditions, in the case of the example of the present invention, the above-mentioned 3 was obtained.
In all of the modes (a), (b), and (c), the power consumption was not significantly different from that after the change, and the sharpness was better than the initial time. However, the comparative example had an increased initial power consumption, and the sharpness was poor. It shows that.

In addition, as a result of cutting the hard stone (white granite), the power consumption of the three forms (a), (b) and (c) is not significantly different from that after the replacement, and the sharpness is better than the initial one. Was. In the comparative example, the initial power consumption was large, the sharpness was reduced, and it became impossible to cut due to blindness.

Test conditions Cutting blade Dimensions: 375D x 47L x 3.3T x 10X x 21N x
27H Diamond: SD40 Concentration: 30

[0019]

[Table 1]

[0020]

[Table 2] Note “Initial” indicates the average power consumption when cutting 0-10 m for concrete and 0-20 m for white granite. “1m
“After m wear” indicates the power consumption when the segment chip height is worn by 1 mm.

[0021]

As described above, according to the present invention, the following effects can be obtained. (1) Since the melting point of the particles to be embedded is higher than the sintering temperature of the segment chip, it is possible to maintain substantially the same diameter as diamond without being diffused into the segment chip even after sintering. (2) The particle to be embedded is 5 in Knoop hardness more than diamond.
When the hard material is cut, the particles in the segment chip are worn first, and the force acting on the diamond abrasive increases, so that the degraded diamond falls off and changes smoothly. (3) By making the diameter substantially the same as that of diamond, when the embedded particles are worn out and disappear, it is the same as that of one diamond falling off, which promotes switching. (4) As described above, it is possible to obtain a diamond blade having sharpness that is stable from the beginning without shortening the life. (5) A blade can be designed with an emphasis on life without considering the initial sharpness.

[Brief description of the drawings]

FIG. 1 is an enlarged view showing an outer peripheral surface of an embodiment in a segment tip structure of a diamond blade of the present invention.

FIGS. 2A and 2B are explanatory diagrams showing examples of three modes (a), (b), and (c) in which particles are embedded in a segment chip.

[Explanation of symbols] 1 Disc-shaped steel base metal 2 Segment chip 3 Embedded particles

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3C063 AA02 AB03 BA03 BA24 BB01 BB02 BB07 BB23 BC02 BG05 EE31 FF20 FF23

Claims (3)

[Claims] 1. A Knoop hardness made of a material having substantially the same diameter as a diamond abrasive and having a melting point higher than a temperature at which a segment chip is fired, on a cutting action surface of an outer periphery of a segment chip mounted on an outer periphery of a disk-shaped base metal. Is 2500Kg / m at room temperature
The m ² or less of the particles, the diamond blade segment structure, characterized in that embedded the cutting action face surface 1-3 times the depth of the particle size. 2. The ratio of the number of diamond abrasives and particles to be embedded on the outer peripheral surface of a segment chip is 2: 1 to 1:
4. The diamond blade segment structure according to claim 1, wherein the segment structure is 4. 3. A segment structure of a diamond blade, wherein particles to be embedded are geometrically arranged on the outer peripheral surface of the segment tip at the ratio according to claim 2.