JP2003275969A - Cutting wheel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress reduction in sharpness due to wear of abrasive grains by intentionally varying a projection height of the abrasive grains, in a cutting wheel with abrasive grains bonded to a base by a brazing method. <P>SOLUTION: An outer circumference of a disklike base 1 has a constant pattern of recessed portions 12a and 12b of different depths in a base circumference direction, and the abrasive grains 2 are positioned on a flat face and in the recessed portions 12a and 12b on the outer base circumference, and the abrasive grains 2 are bonded in a constant pattern of projection heights of the abrasive grains 2 differing in the base circumference direction. At wheel use, the abrasive grains serve for cutting in descending order of projection height, so that with cutting efficiency in an initial state of use being maintained, the life of the wheel can be prolonged. <P>COPYRIGHT: (C)2003,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,
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 portion 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 has reduced 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 disc is attached to the outer peripheral surface of the substrate. Concave portions with different depths are formed in a constant pattern in the circumferential direction of the substrate, and abrasive grains are arranged on the flat surface of the outer peripheral surface of the substrate and the concave portions so that the protrusion height of the abrasive grains in the circumferential direction of the substrate is different in a constant pattern. It is a cutting wheel to which abrasive grains are fixed.

Since the protrusion heights of the abrasive grains are made different, the abrasive grains having the highest protrusion height are worn first by the use of the wheel, and then the abrasive grains having the second highest height act for cutting. However, since the abrasive grains having a lower height sequentially act on the cutting, the life of the wheel can be extended while maintaining the cutting efficiency in the initial stage of use. At this time, since the protrusion height of the abrasive grains is made different in a constant pattern in the circumferential direction of the substrate, there is almost no change in the sharpness in the circumferential direction of the substrate during the period of use of the wheel, and stable sharpness can be obtained.

Here, it is desirable that the range in which the protrusion height of the abrasive grains is different is within 50% of the abrasive grain diameter. If there is a variation in protrusion height that exceeds 50% of the abrasive grain size, the brazing material holding the highest abrasive grain will contact the workpiece before the second abrasive grain acts. It is not preferable because it reduces sharpness. On the other hand, in order to extend the life of the wheel, it is preferable that the protrusion height is changed by at least 20% of the abrasive grain size. If the change in protrusion height is smaller than 20% of the abrasive grain diameter, adjacent abrasive grains simultaneously act on the cutting and are damaged at the same time, which is not much different from the conventional protrusion height. Become.

Further, the recesses having different depths formed on the outer peripheral surface may be formed by forming one recess for each abrasive grain, that is, forming one recess for each abrasive grain, or ,
One recess having an inclined surface may be formed for a plurality of abrasive grains, that is, it may be formed corresponding to a plurality of abrasive grains. When forming recesses corresponding to each abrasive grain, for example, a recess group whose depth becomes deeper toward the rear part in the wheel rotation direction is formed, and the same recess group is repeatedly formed on the wheel outer peripheral surface. Then, the abrasive grains are fixed to the respective concave portions. When forming recesses corresponding to a plurality of abrasive grains, a plurality of inclined surfaces that become deeper toward the downstream side in the wheel rotation direction are formed on the wheel outer peripheral surface, and a plurality of inclined surfaces are formed on each inclined surface. Fix the abrasive grains.

[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, the abrasive grains 2 (2a to 2c) are diamond abrasive grains having an average grain size of 0.35 mm, and the brazing material 3 is A.
It is a wax containing an active metal of the g-Cu-Ti system.

Slits 11 for discharging chips are formed in the outer peripheral portion of the substrate 1, and the abrasive grains 2a.about.
2c is provided. Three rows of abrasive grains 2a to 2c are arranged on the outer peripheral surface of the substrate 1 at intervals in the substrate circumferential direction, and two rows of abrasive grains are arranged on the outer peripheral side surface. It is fixed.

Next, the arrangement of the abrasive grains 2a to 2c on the outer peripheral surface will be described. In the cutting wheel 10 of the present embodiment, as shown in a partially enlarged view of FIG. 2, a recess 12a having a depth that gradually increases from the front side to the rear side in the wheel rotation direction (indicated by an arrow in the drawing), 12b are sequentially and repeatedly formed on the outer peripheral surface of the substrate to form the individual recesses 12a, 1
Abrasive grains 2b and 2c are fixed to 2b, respectively, and the abrasive grain 2a is fixed to a portion where the concave portion is not formed so that the protrusion heights of the abrasive grains 2a to 2c are different in a constant pattern in the circumferential direction of the substrate. Are provided with abrasive grains 2a to 2c. As a result, when the cutting wheel 10 is used, the abrasive grain 2a having the highest protrusion height is worn first, the abrasive grain 2b having the second highest height acts on the cutting, and the abrasive grain 2b having the third highest height is then used. Since the particles 2c act on the cutting, the life of the cutting wheel 10 can be extended while maintaining a predetermined cutting efficiency.

FIG. 3 is a view for explaining a cutting wheel according to a second embodiment of the present invention, and is an enlarged view of a part as seen in the circumferential direction of the substrate. In the figure, the abrasive grains and the arrangement of the abrasive grains are schematically shown.

The cutting wheel of this embodiment is also the same as the cutting wheel 10 of the first embodiment for cutting concrete or cement-based building materials. The outer diameter of the substrate 21,
The thickness and the material are also the substrate 1 of the cutting wheel 10 of the first embodiment.
Is the same as.

Slits 22 for discharging chips are formed on the outer peripheral portion of the substrate 21, and abrasive grains 22 are provided between the slits 22.
a to 22d are provided. 3 on the outer peripheral surface of the substrate 21
The rows of abrasive grains 22a to 22d are arranged at intervals in the circumferential direction of the substrate, and the two rows of abrasive grains are arranged on the outer peripheral side surface and are fixed to the substrate 21 by the brazing material 3.

In the cutting wheel of the present embodiment, as shown in FIG. 3, a concave portion formed by an inclined surface 21a having a depth that increases from the front side to the rear side in the wheel rotation direction (indicated by an arrow in the drawing). Are formed on the outer peripheral surface of the substrate, a plurality of abrasive grains 22b to 22d are fixed to each inclined surface 21a, and the abrasive grains 22a are fixed to a portion where no concave portion is formed. The abrasive grains 22a to 22d have different protrusion heights in a certain pattern.
a to 22d are provided. As a result, the abrasive grain 22a having the highest protrusion height is first obtained by using the cutting wheel.
Wears first, then the second-highest abrasive grain 22b acts on the cutting, and then the abrasive grains 22c, 22d sequentially act on the cutting, thereby maintaining the predetermined cutting efficiency and The life can be extended.

The manufacturing procedure of the cutting wheel 10 of the first 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. The recesses 12a and 12b are formed on the outer peripheral surface of the substrate 1 by knurling or the like. -Prepare diamond abrasive grains having an average particle diameter of about 350 μm as the abrasive grains 2a to 2c. An organic adhesive is applied to the outer peripheral surface (including the concave portion) of the substrate 1 using a screen in which holes having a diameter of 0.35 mm are arranged in a predetermined shape. -Place the abrasive grains 2 on this organic adhesive. In this state, the abrasive grains 2a to 2c are arranged on the outer peripheral surface of the substrate 1 in the form shown in FIG. -Abrasive grains are also arranged on the outer peripheral side surface of the substrate 1 in the same procedure. -This is dried in a drying furnace at 120 ° C for 1 hour to temporarily fix the abrasive grains. -Using a three-dimensionally movable applicator (discharging machine), a mixture of a brazing material and a binder is applied to the bonding portion at a height of about 1/2 of the abrasive grain size. -This is heated at 1000 ° C for 1 hour in a non-oxidizing atmosphere to permanently fix the abrasive grains to the substrate. The manufacturing procedure of the cutting wheel of the second embodiment is the same as that of the cutting wheel of the first embodiment, except for the difference in the shape of the concave portion on the outer periphery of the substrate (the shape of the outer peripheral surface).

[Test Example] The cutting wheel (invention 1) of the first embodiment shown in FIG. 2, the cutting wheel (invention 2) of the second embodiment shown in FIG. 3, and the cutting wheel of the first embodiment A cutting wheel (comparative product) having the same shape as the substrate and having the same number of abrasive grains arranged at a uniform protrusion height was manufactured and a cutting processing test was performed.

[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: Load current 8 A 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 about 1.5 to 1.8 times as compared with the cutting wheel of the comparative product in which the protrusion height of the abrasive grains is uniform. Has improved.

[0025]

EFFECTS OF THE INVENTION Concave recesses having different depths are formed on the outer peripheral surface of a substrate in a constant pattern in the peripheral direction of the substrate. By using a cutting wheel in which abrasive particles are adhered so that the protruding height of each of them is different in a certain pattern, the abrasive particles with the highest protruding height are worn first and then the second height by using the wheel. Since the abrasive grains of No. 2 act on the cutting, and the abrasive grains of successively lower height act on the cutting in succession, the life of the wheel can be extended while maintaining the cutting efficiency in the initial stage of use.

[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 diagram illustrating a cutting wheel according to a second embodiment of the present invention, and is an enlarged view of a part of the cutting wheel as seen in a substrate circumferential direction.

[Explanation of symbols]

1,21 substrate 2, 2a to 2c, 22a to 22d Abrasive grains 3 brazing material 10 cutting wheels 11,22 slits 12a, 12b recess 21a inclined surface

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Seiya Ogata             210 Takeno, Odaiba, Ukiha-gun, Fukuoka             Noritake Diamond Co., Ltd. F-term (reference) 3C063 AA02 AB03 BA08 BA12 BA24                       BB02 BB23 BC02 BG07 BH05                       BH18 EE31 FF08 FF20

Claims (4)

[Claims] 1. A cutting wheel in which abrasive grains are arranged in a single layer on the outer peripheral surface and the outer peripheral surface of a disk-shaped substrate and brazed, and recesses having different depths are formed on the outer peripheral surface of the substrate in a constant pattern in the peripheral direction of the substrate. A cutting wheel in which abrasive grains are formed on the flat surface of the outer peripheral surface of the substrate and the recesses, and the abrasive grains are fixed so that the protruding height of the abrasive grains in the substrate circumferential direction varies in a fixed pattern. 2. The cutting wheel according to claim 1, wherein the range in which the protruding height of the abrasive grains is different is within 50% of the abrasive grain size. 3. The cutting wheel according to claim 1, wherein the concave portion is formed corresponding to each abrasive grain. 4. The cutting wheel according to claim 1, wherein the recess is formed corresponding to a plurality of abrasive grains.