JP3047151B2 - Grinding wheel and method of manufacturing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a grindstone tip by solidifying abrasive grains having a particularly high hardness, such as diamond and cubic boron nitride, into an arc plate shape using a binder. The present invention relates to a grinding wheel adhered to an outer periphery of a member and a method of manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, it has been known to form a circular grindstone by bonding a large number of arcuate plate-shaped vitrified grindstone chips to the outer peripheral surface of a grindstone base using an adhesive. Japanese Patent Application Publication No. JP-A-2002-115139 discloses a configuration in which a grindstone chip formed in an arc plate shape is adhered such that the entire inner peripheral surface of the grindstone chip is aligned with the outer peripheral surface of a grindstone base.

According to Japanese Utility Model Publication No. 60-24536, in order to increase the adhesive strength of a grinding wheel chip to a grinding wheel base, a plurality of recesses are formed on the inner circumferential surface of the grinding wheel chip, and grooves are formed on the entire outer circumferential surface of the grinding wheel base. Is known.

[0004]

The bonding strength of the adhesive depends on the thickness of the adhesive interposed between the members to be bonded. That is, if the thickness of the adhesive is thin, the adhesive strength is reduced, and if it is too thick, sufficient adhesive strength cannot be obtained. Therefore, when bonding the grindstone chip to the grindstone base, it is necessary to maintain a constant gap in which the adhesive is interposed, that is, the distance between the inner peripheral surface of the grindstone chip and the outer peripheral surface of the grindstone base.

In the above-mentioned conventional device, the entire inner peripheral surface of the grinding wheel chip is adhered to the outer peripheral surface of the grinding wheel base, so that an adhesive is applied between the inner peripheral surface of the grinding wheel chip and the outer peripheral surface of the grinding wheel base. There is a problem that a sufficient gap for intervening is not ensured stably, so that the bonding strength is weak and the bonding strength is not constant. In addition, even if the concave portion and the groove are provided to enhance the adhesive strength, the portion where the concave portion is not provided on the inner peripheral surface of the grinding wheel tip and the portion where the groove is not provided on the outer peripheral surface of the grinding wheel base are provided. Occupies a large part of the bonding area, and these parts come into direct contact with each other without any intervening gap, so that sufficient bonding strength cannot be ensured.

According to Japanese Patent Application Laid-Open No. 1-316175, mounting seats made of resin or the like are provided on a plurality of portions of the inner peripheral surface of the grinding wheel chip, and the mounting seat is fixed so that the distance from the outer peripheral surface of the grinding wheel chip is constant. It is known to eliminate the unevenness between the outer peripheral surfaces of the grindstone chips after bonding by providing a mounting surface by shaving the tip, according to which the inner peripheral surface of the grindstone chips and the outer peripheral surface of the grindstone base are known. Although the gap is secured between the two, the mounting surface position is based on the outer peripheral surface of the grindstone chip, so the height of the mounting seat from the inner peripheral surface of the grindstone chip is not constant, and therefore the bonding strength is not uniform In addition, a step of separately providing each mounting seat for each of the plurality of grinding stone chips and a cutting step for providing the mounting seat are required.

An object of the present invention is to provide a grinding wheel and a method of manufacturing the same without these problems.

[0008]

In order to achieve the above object, an invention according to claim 1 is to provide a plurality of grinding wheel chips formed of an arc-shaped plate with super-hard abrasive grains and a binder in the outer periphery of a grinding wheel base. In the grinding wheel that is bonded to the surface, on the inner peripheral surface of the grinding wheel chip , a plurality of mounting seats having a seating surface at the tip at a fixed radial position from the inner peripheral surface of the grinding wheel chip are integrally formed with the grinding wheel chip ,
The seat surface is brought into contact with the grindstone base, and the inner peripheral surface of the grindstone chip is bonded to the grindstone base.

A second aspect of the present invention is a grinding wheel in which a plurality of arc-shaped plate-shaped grinding stone chips formed of super-hard abrasive grains and a binder are bonded to an outer peripheral surface of a grinding wheel base with an adhesive. In the method of manufacturing, the grinding wheel tip is molded using a mold having a plurality of recesses of a certain depth on a mold surface serving as a molding surface of the inner peripheral surface of the grinding wheel chip, and the recessed portion is formed on the inner peripheral surface of the grinding wheel chip. A plurality of mounting seats having a fixed height with a seating surface at the tip are formed integrally with the grinding wheel chip, and the seating surface is seated on the outer peripheral surface of the grinding wheel base, The inner peripheral surface of the grinding wheel tip is bonded to the grinding wheel base with an adhesive.

[0010]

According to the first aspect of the present invention, since the height of the mounting seat with respect to the inner peripheral surface of the grindstone tip is constant, when the mounting surface is brought into contact with the outer peripheral surface of the grindstone base, any of the grindstone chips can be used. Also, a certain gap is formed between the inner peripheral surface of the grinding wheel tip and the outer peripheral surface of the grinding wheel base. Since the adhesive is filled in this gap, the thickness of the adhesive is kept constant, strong,
And stable adhesive strength can be obtained.

According to the second aspect of the present invention, by using a mold having a plurality of concave portions having a constant depth on the surface, when molding the inner peripheral surface of the grinding wheel chip, the abrasive grains are filled also in the concave portions,
Thereby, a mounting seat having a constant height is formed at the same time as the grinding wheel chip is formed.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a grinding wheel according to the present invention, in which a large number of circular plate-shaped grinding wheel chips 3 are bonded to an outer peripheral surface 2 of a grinding wheel base 1 made of steel or aluminum with an adhesive 4. Whetstone tip 3
It is called a vitrified grindstone obtained by kneading and firing ultra-hard abrasive grains such as diamond and cubic boron nitride together with a vitreous binder, and has a thickness of about 3 mm.

As shown in FIG. 2, the grindstone chip 3 is formed by being sandwiched between an upper mold MU and a lower mold ML which are movably opposed along a guide SG. Whetstone chip 3 but is formed into an arc-shaped as described above, arc-shaped outer peripheral surface 3a is formed by the lower mold ML, arc by the upper mold M U-shaped inner peripheral surface 3b
Is formed. A plurality of recesses H having a certain depth are provided on the molding surface of the upper mold MU. When the grinding wheel chip 3 is molded using the upper mold MU, the abrasive grains are filled also in the recesses H,
On the inner peripheral surface 3b of the grindstone chip 3, a projection-like mounting seat 5 is formed as shown in FIG. By the way, even if the amount of abrasive particles to be filled between the upper mold MU and the lower mold ML varies to some extent, only the thickness of the grindstone chip 3 varies but the height of the mounting seat 5 is determined by the depth of the concave portion H. All the tips 3 have a constant height. Note that the tip of the mounting seat 5 forms a seating surface 5 a that comes into contact with the outer peripheral surface 2 of the grindstone base 1.

After sintering the formed grinding wheel chips 3, as shown in FIG. 4, first, an appropriate amount of adhesive is applied to the outer peripheral surface 2 of the grinding wheel base 1, and the grinding wheel chips 3 are placed in a small gap between each other. The outer peripheral surface 3a of the grinding wheel tip 3 is further squeezed with a belt or the like (not shown) so that the seating surface 5a is in close contact with the outer peripheral surface 2. Then, the adhesive 4 is extruded at the portion of the seating surface 5a, and the seating surface 5a comes into contact with the outer peripheral surface 2 via the extremely thin film of the adhesive 4.
The adhesive 4 is filled in a fixed gap formed between the outer peripheral surface 2 of the grinding wheel base 1 and the inner peripheral surface 3b of the grinding wheel chip 3.

If the thickness of the grindstone chip 3 varies, irregularities occur on the outer peripheral surface of the grindstone, and dressing is required. However, the thickness of the grindstone chip 3 is set between the upper mold MU and the lower mold ML as described above. Since the amount is determined by the amount of the abrasive particles to be filled in between, if the amount is controlled to be constant, unevenness generated on the outer peripheral surface of the grindstone can be minutely suppressed, and the dressing amount can be reduced.

In the above embodiment, the adhesive 4 can be an epoxy-based adhesive or any other suitable material, and the shape of the mounting seat is not limited to the circular shape as shown, but can be linear. Further, as the abrasive grains of the grinding wheel chip 3, abrasive grains such as alumina or nitrogen carbide can be mixed in addition to the above-mentioned super-hard abrasive grains. A resin bond grindstone, a metal bond grindstone, or the like may be used by using a metal bond material or other materials. In the above embodiment, a metal base was used as the grindstone base.
A resin material such as FRP or a ceramic material may be used.

[0017]

As is clear from the above description, according to the first aspect of the present invention, the thickness of the adhesive can be made uniform for each grinding wheel chip, so that the bonding strength of each grinding wheel chip becomes constant. In addition, since there is no unevenness on the inner peripheral surface of the grinding wheel chip, the life of the grinding wheel does not vary for each grinding wheel chip.

According to the second aspect of the present invention, since the mounting seat for making the thickness of the adhesive constant is formed at the same time as the grinding wheel chip is formed, the number of manufacturing steps of the grinding wheel can be reduced.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of an entire grinding wheel.

FIG. 2 is a diagram showing a method of molding a grinding wheel tip.

FIG. 3 is a view showing a shape of a mounting seat.

FIG. 4 is a diagram showing a bonded state of a grinding wheel tip.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Whetstone base 2 Outer peripheral surface (of whetstone base) 3 Grindstone tip 4 Adhesive 5 Mounting seat 5a Seating surface

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. ⁷ , DB name) B24D 5/00 B24D 3/00 310 B24D 3/00 340 B24D 5/06

Claims (2)

(57) [Claims] 1. A grinding wheel comprising a plurality of grinding wheel chips formed into an arc plate shape with super-hard abrasive grains and a binder, which is bonded to an outer peripheral surface of a grinding wheel base. A plurality of mounting seats having a seating surface at a tip thereof at a constant radial position from the inner peripheral surface of the chip are integrally formed with the grinding wheel chip, and the seating surface is brought into contact with a grinding wheel base to thereby form the inside of the grinding wheel chip. A grinding wheel characterized in that its peripheral surface is bonded to a wheel base. 2. A method for manufacturing a grinding wheel by bonding a plurality of arc-shaped plate-shaped grinding wheel tips formed of an ultra-hard abrasive grain and a binder to an outer peripheral surface of a grinding wheel base with an adhesive. Molding a grinding wheel tip using a mold having a plurality of recesses of a certain depth on a mold surface serving as a molding surface of the grinding wheel tip, the inner circumference surface of the grinding wheel tip is molded with the recess. A plurality of mounting seats having a fixed height with a seating surface at the tip are integrally protruded from the grindstone chip, the seating surface is seated on the outer peripheral surface of the grindstone base, and the inner peripheral surface of the grindstone chip is bonded with an adhesive. A method for manufacturing a grinding wheel, wherein the grinding wheel is bonded to a wheel base.