JP2003305656A - Cutting wheel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress the degradation of sharpness caused by the abrasion of abrasive grains by intentionally changing the projecting height of the abrasive grains in a cutting wheel with the abrasive grains stuck to a base by a brazing method. <P>SOLUTION: In the cutting wheel with the abrasive grains 2 arranged in one layer and brazed on the outer peripheral surface and the outer peripheral part side face of the disk-shaped base 1, the abrasive grains 2a, 2b, 2c different in average grain diameter are regularly arranged in the circumferential direction of the base within the abrasive grain layer forming range of the outer peripheral surface of the cutting wheel, and the abrasive grains are stuck in such a manner that the projecting height of the abrasive grains differs in a fixed pattern in the circumferential direction of the base. Stable sharpness can thereby be obtained with almost no fluctuation of sharpness in the circumferential direction of the base throughout the service period of the cutting wheel. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a cutting wheel used for cutting concrete, concrete secondary products, cement-based building materials, ceramic-based building materials, and the like.
The present invention relates to a cutting wheel in which the sharpness and life of the wheel are improved by improving the arrangement of abrasive grains that are further arranged on a substrate by brazing.

[0002]

2. Description of the Related Art Concrete, secondary concrete products,
BACKGROUND ART For cutting cement-based building materials, ceramic-based building materials, etc., a cutting wheel in which abrasive grains are further arranged by a brazing method on the outer peripheral surface and the outer peripheral side surface of a disk-shaped substrate is used. Such a cutting wheel is required to have excellent sharpness and to maintain the sharpness stably for a long period of time. However, the cutting wheel deteriorates in sharpness and life as the cutting work progresses.

The main causes thereof are that the adhered state of the abrasive grains on the substrate is unstable and the abrasive grains are likely to fall off, the chip pocket is small, and the control of the abrasive grain interval is insufficient, so that during cutting work. It is possible that the chips cause clogging. Especially regarding the abrasive grain interval, it is difficult to arrange the abrasive grains in a predetermined arrangement state on the surface of the substrate, and in the portion where the abrasive grains are in close proximity to each other, cutting chips are difficult to be discharged, resulting in a decrease in sharpness. Connect

As a measure for uniformly dispersing abrasive grains in the production of a cutting wheel by the brazing method, Japanese Patent Laid-Open No. 9-19867 discloses a method in which metal-coated diamond abrasive grains are used to form a gap between a substrate outer peripheral surface and a die. A method for manufacturing a cutting wheel is disclosed, in which the silver brazing material is infiltrated and the substrate and the mold are heated and the silver solder is infiltrated into the gap. In addition, JP-A-10-118
Japanese Patent No. 937 describes a cutting wheel in which working abrasive grains are formed by a single layer of one or a plurality of superabrasive grains, and the distance between the working abrasive grains in the outer circumferential direction is equal to or larger than the grain size of the working abrasive grains. Has been done.

[0005]

By the way, in the conventional cutting wheel in which the abrasive grains are fixed to the outer peripheral surface of the substrate by the brazing method, truing or the like is performed so that the protrusion height of the abrasive grains from the outer peripheral surface of the substrate becomes uniform. Has been adjusted by. The reason why the protrusion height is made uniform is that the load at the time of cutting is evenly distributed and that the vibration is reduced to reduce chipping. When the adjustment by truing is not performed, abrasive grains having different protrusion heights are present, but the sharpness becomes unstable because they are irregularly scattered.

However, if the protrusion height of the abrasive grains is uniform, as the abrasion of the abrasive grains progresses with the use of the cutting wheel, the bite into the material to be cut becomes worse and the chip pocket becomes narrower. Poor discharge of powder. The slit is provided like the cutting wheel described in Japanese Patent Application Laid-Open No. 10-118937 in order to improve the discharging property of the chips, but in this case as well, the poor cutting into the material to be cut due to the abrasion of the abrasive grains It cannot be prevented.

The problem to be solved by the present invention is to intentionally change the protrusion height of abrasive grains in a cutting wheel in which abrasive grains are fixed to a substrate by a brazing method.
It is to suppress the deterioration of sharpness due to abrasion of abrasive grains.

[0008]

A cutting wheel according to the present invention is a cutting wheel in which abrasive grains are arrayed and brazed on the outer peripheral surface and the outer peripheral side surface of a disk-shaped substrate, and the abrasive layer is formed on the outer peripheral surface of the substrate. A cutting wheel in which abrasive grains with different average particle diameters are regularly arranged in the formation range in the substrate circumferential direction, and the abrasive grains are fixed so that the protrusion height of the abrasive grains in the substrate circumferential direction varies in a fixed pattern. is there.

By using a plurality of types of abrasive grains having different average grain sizes as the abrasive grains so that the protrusion heights of the abrasive grains are different in the circumferential direction of the substrate, the protrusion height is first increased by using the wheel. The abrasive grain with the maximum grain size wears first, the abrasive grain with the second largest grain size acts on the cutting, and the abrasive grains with the smallest grain size subsequently act on the cutting, so that the cutting efficiency at the initial stage of use You can extend the life of the wheel while maintaining. At this time, by regularly arranging the abrasive grains having different average particle diameters in the substrate circumferential direction so that the protrusion heights of the abrasive grains are different in a constant pattern in the substrate circumferential direction, the substrate circumferential direction can be maintained during the period of use of the wheel. Stable sharpness can be obtained with almost no change in sharpness.

Here, the difference in protrusion height of the abrasive grains is
It is desirable to set it within the range of 20 to 100% of the minimum average particle size. If the difference in particle size between the smallest and largest average grain size exceeds two times, the brazing material that has held the largest grain size will remain before the brazing material with the smallest grain size acts. Furthermore, it is not preferable because it comes into contact with the material to be cut and the sharpness is reduced. On the other hand, in order to extend the life of the wheel, it is preferable that there is a change in protrusion height of at least 20% of the minimum average particle size.
When the change in protrusion height is smaller than 20% of the minimum average particle diameter, there is no great difference from the conventional protrusion height.

More specifically, if the abrasive grains on the outer peripheral surface of the substrate are arranged in a line in the circumferential direction, the abrasive grains are arranged in the circumferential direction in descending order of grain size. If the arrangement of the abrasive grains is two or more rows in the circumferential direction, the abrasive grains are arranged in the row in the circumferential direction in descending order of grain size,
The adjacent rows are arranged in the same order, or the arrangement order is shifted by one abrasive grain. With such an arrangement, the abrasive grains having a large grain size sequentially act on the grains having a small grain size to cut, whereby the life of the wheel can be extended while maintaining the cutting efficiency in the initial stage of use.

[0012]

1 and 2 are views for explaining a cutting wheel according to a first embodiment of the present invention. (A) of FIG. 1 is a front view of the cutting wheel, (b) is (a) thereof. ) A-
FIG. 2 is a cross-sectional view taken along the line A, and FIG. 2 is an enlarged view of a part viewed in the substrate circumferential direction. In the figure, the abrasive grains and the arrangement of the abrasive grains are schematically shown.

The cutting wheel 10 of this embodiment is a wheel for cutting concrete or cement-based building materials. The substrate 1 is a steel substrate having an outer diameter of 100 mm and a thickness of 1.2 mm. Abrasive grain 2 is a diamond abrasive grain, and a large abrasive grain 2a, a medium abrasive grain 2b, and a small abrasive grain 2 having different average grain sizes.
It consists of c. The brazing material 3 is an Ag-Cu-Ti-based active metal-containing brazing material.

Slits 11 for discharging chips are formed on the outer periphery of the substrate 1, and abrasive grains 2 are arranged between the slits 11. As shown in FIG. 3, on the outer peripheral surface of the substrate 1, abrasive grains 2 are arranged in 1 to 3 rows at intervals in the circumferential direction of the substrate, and on the outer peripheral side surface, the abrasive grains 2 are arranged in 2 rows. And is fixed to the substrate 1 by the brazing material 3.

Next, the arrangement of the abrasive grains 2 on the outer peripheral surface will be described. In the cutting wheel 10 of this embodiment, as shown in FIG.
As shown in the partially enlarged view of the wheel rotation direction (in the figure,
(Indicated by an arrow), a large abrasive grain 2a, a medium abrasive grain 2b, and a small abrasive grain 2c are sequentially and repeatedly arranged in order from the front portion to the rear portion thereof, and the abrasive grains 2 having different grain diameters as a whole are in the circumferential direction of the substrate. The large abrasive grains 2a, the medium abrasive grains 2b, and the small abrasive grains 2c are arranged so that the protruding heights of the abrasive grains 2 are different in a fixed pattern in the circumferential direction of the substrate. As a result, when the wheel is used, the large abrasive grain 2a having the highest protrusion height is worn first, and then the medium abrasive grain 2b having the second highest height is worn.
Acts on the cutting, and then the small abrasive grains 2c of the third height act on the cutting, whereby the life of the wheel can be extended while maintaining a predetermined cutting efficiency.

FIG. 3 is a partially enlarged view showing an arrangement example of abrasive grains in the circumferential direction of the substrate. In the figure, the abrasive grains and the arrangement of the abrasive grains are schematically shown.

FIG. 3A shows an example of a cutting wheel having a thin substrate, in which the abrasive grains 2 are arranged in only one row in the circumferential direction of the substrate. In the arrangement form, the large abrasive grains 2a, the medium abrasive grains 2b, and the small abrasive grains 2c are repeatedly arranged in the order of increasing particle diameter from the front part to the rear part in the wheel rotation direction.

FIG. 3B shows an example in which the abrasive grains 2 are arranged in two rows in the circumferential direction of the substrate. The arrangement is such that, in the row, the large abrasive grains 2a and the medium abrasive grains are arranged in the order of increasing grain size in the circumferential direction. 2b and small abrasive grains 2c are arranged, and the adjacent columns are arranged such that the arrangement order is shifted by one abrasive grain.

FIG. 3 (c) shows an example in which a third row, which is shifted by one abrasive grain, is arranged in addition to the two rows arranged in FIG. 3 (b).
FIG. 3D shows an example in which the arrangement of the third row is the same as that of the first row.

In any of the cases (a) to (d) of FIG.
A large abrasive grain 2a, a medium abrasive grain 2b, and a small abrasive grain 2c are repeatedly arranged in the order of increasing grain size from the front part to the rear part in the wheel rotation direction, and the abrasive grains 2 having different grain sizes as a whole are regularly arranged in the circumferential direction of the substrate. The large abrasive grains 2a, the medium abrasive grains 2b, and the small abrasive grains 2c are arranged so that the protrusion height of the abrasive grains decreases in the circumferential direction of the substrate. As a result, wear of the wheels increases in the order of protrusion height, and the abrasive particles with decreasing protrusion heights act on the cutting, thereby extending the life of the wheels while maintaining a predetermined cutting efficiency.

The manufacturing procedure of the cutting wheel 10 of this embodiment is as follows. As the substrate 1, a steel substrate having an outer diameter of 100 mm and a thickness of 1.2 mm is prepared. -Diamond abrasive grains having an average particle diameter of about 600 µm as the large abrasive grains 2a, diamond abrasive grains having an average particle diameter of about 450 µm as the medium abrasive grains 2b, and average particle diameter of about 350 as the small abrasive grains 2c.
A diamond abrasive grain of μm is prepared. An organic adhesive is applied to the outer peripheral surface of the substrate 1 using a screen in which holes having a size corresponding to the arrangement of the large abrasive grains 2a, the medium abrasive grains 2b, and the small abrasive grains 2c on the outer peripheral surface of the substrate are arranged in a predetermined shape. To do. -Large abrasive grains 2a, medium abrasive grains 2b, and small abrasive grains 2c are arranged on this organic adhesive. In this state, large abrasive grains 2a, medium abrasive grains 2
b, the small abrasive grains 2c are arranged on the outer peripheral surface of the substrate in any of the shapes shown in FIGS. The abrasive grains 2 are arranged on the side surface of the outer peripheral portion of the substrate by the same procedure.・ This is dried in a drying oven at 120 ° C for 1 hour to give 2 abrasive grains.
Temporarily fix. -Using a three-dimensionally movable applicator (discharging machine), apply the mixture of the adhesive part, the brazing material, and the binder to a height of about 1/2 of the abrasive grain size. -This is heated in a non-oxidizing atmosphere at 1000 ° C for 1 hour to permanently fix the abrasive grains 2 to the substrate 1.

[Test Example] A cutting wheel having an abrasive grain arrangement shown in FIG. 3C (invention product 1), a cutting wheel having an abrasive grain arrangement shown in FIG. 3D (invention product 2), and A cutting wheel (comparative product) having the same shape and the same number of abrasive grains of the same size as the substrates of the invention products 1 and 2 was manufactured and a cutting processing test was conducted.

[Test conditions] Cutting machine: Hitachi circular saw C4YA1 Machine rotation speed: 13000 min ^-1 Material to be cut: Extrusion molding cement board Depth of cut: 15 mm / pass Cutting method: Dry cutting Feed rate: 8 A of load current To adjust

Table 1 shows the test results.

[Table 1]

The cutting speed and the wheel life of the invention products 1 and 2 are shown by indexes when the cutting speed and the wheel life of the comparative product are 100. As can be seen from the table, the cutting wheels of the invention products 1 and 2 have a cutting speed and a wheel life of 1.3 to 1.5 as compared with the cutting wheel of the comparative product in which the abrasive grains 2 having a uniform particle size are arranged. It has improved about twice.

[0026]

EFFECT OF THE INVENTION By using a plurality of types of abrasive grains having different average particle diameters as the abrasive grains arranged on the outer peripheral surface of the substrate, the protrusion heights of the abrasive grains are made different in the circumferential direction of the substrate. While the abrasive grains having a smaller grain size act on the cutting in order from the larger grain, the cutting efficiency at the beginning of use is maintained,
The life of the wheel can be extended. In particular, by regularly arranging the abrasive grains having different average particle diameters in the substrate circumferential direction so that the protrusion height of the abrasive grains is different in a constant pattern in the substrate circumferential direction, the substrate circumferential direction can be kept constant during the period of use of the wheel. Stable sharpness is obtained with almost no change in sharpness.

[Brief description of drawings]

1 (a) is a front view of a cutting wheel, FIG.
(B) is the sectional view on the AA line of (a).

FIG. 2 is an enlarged view of a part of the cutting wheel of FIG. 1 viewed in the substrate circumferential direction.

FIG. 3 is a partially enlarged view showing an arrangement example of abrasive grains in the circumferential direction of a substrate.

[Explanation of symbols]

1 substrate 2 abrasive grains 2a Large abrasive grain 2b Medium abrasive 2c small abrasive 3 brazing material 10 cutting wheels 11 slits

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Seiya Ogata             210 Takeno, Odaiba, Ukiha-gun, Fukuoka             Noritake Super Abrasive Co., Ltd. F-term (reference) 3C063 AA02 AB03 BA23 BB02 BC02                       BG05 BG07 CC08 EE16 EE31                       FF08 FF20 FF23

Claims (2)

[Claims] 1. A cutting wheel in which a single layer of abrasive grains is arrayed and brazed on the outer peripheral surface and the outer peripheral surface of a disk-shaped substrate, and abrasive grains having different average particle diameters are present in the abrasive grain layer forming range on the outer peripheral surface of the substrate. A cutting wheel that is regularly arranged in the circumferential direction of the substrate and has the abrasive grains fixed so that the protrusion height of the abrasive grains in the circumferential direction of the substrate is different in a fixed pattern. 2. The cutting wheel according to claim 1, wherein the difference in protrusion height of the abrasive grains is within the range of 20 to 100% of the minimum average grain size.