JPH0871928A - Grinding wheel and manufacture thereof - Google Patents

Abstract

PURPOSE: To make bonding strength uniform by providing a plurality of mounting seats having seating faces at a certain position in the radial direction from an inner peripheral surface on the inner peripheral surface of a grinding wheel tip and bringing the seating faces into contact with a grinding wheel base to bond the inner peripheral face of the grinding wheel tip to the base. CONSTITUTION: A grinding wheel tip 3 is formed by an upper mold and a lower mold, and a circular outer peripheral face is formed by the lower mold. A circular inner peripheral face 4b is formed by the upper mold. Projected mounting seats 5 are formed on the inner peripheral face 3b of the grinding stone tip 3. Owing to this constitution, even if the amount of abrasive particle filled between the upper mold and the lower mold is uneven, only the thickness of the grinding wheel tip 3 is uneven, and the height of the mounting seats 5 becomes uniform. After the grinding wheel tip 3 is baked, adhesive is applied on an outer peripheral face 2 of a grinding wheel base 1, and minute clearances are provided between mutual grinding wheel tips 3, arranged, and bonded. Furthermore, the outer peripheral surface of the grinding wheel tip 3 is fastened by a belt or the like to closely adhere the seating face to the outer peripheral surface 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grinding stone tip formed by solidifying abrasive grains having a particularly high hardness, such as diamond and cubic boron nitride, into a circular arc plate shape by using a bonding material. TECHNICAL FIELD The present invention relates to a grinding wheel adhered to the outer periphery of a steel and a manufacturing method thereof.

[0002]

2. Description of the Related Art Conventionally, it has been known that a large number of arc plate-shaped vitrified grinding wheel chips are fixed to the outer peripheral surface of a grinding wheel base with an adhesive to form a circular grinding wheel. According to Japanese Patent Laid-Open Publication No. JP-A-2003-242, there is known a grindstone chip formed in the shape of an arc plate so that the entire inner peripheral surface of the grindstone chip is bonded to the outer peripheral surface of the grindstone base.

Further, according to Japanese Utility Model Publication No. 60-24536, in order to enhance the adhesive strength of the grindstone tip to the grindstone base, a plurality of recesses are formed on the inner peripheral surface of the grindstone tip, and grooves are formed on the entire outer peripheral surface of the grindstone base. Those with and are known.

[0004]

The adhesive strength of the adhesive depends on the thickness of the adhesive interposed between the adhered members to be adhered to each other. That is, if the thickness of the adhesive is thin, the adhesive strength is lowered, and conversely, if it is too thick, sufficient adhesive strength cannot be obtained. Therefore, when the grindstone tip is adhered to the grindstone base, it is necessary to control the gap in which the adhesive is interposed, that is, the gap between the inner peripheral surface of the grindstone tip and the outer peripheral surface of the grindstone base to be constant.

In the above-mentioned conventional type, since the entire inner peripheral surface of the grindstone tip is bonded to the outer peripheral surface of the grindstone base, the adhesive is applied between the inner peripheral surface of the grindstone tip and the outer peripheral surface of the grindstone base. There is a problem in that a sufficient gap to intervene is not stably secured, and therefore the adhesive strength is weak and the adhesive strength is not constant. Even if the above-mentioned recess and groove are provided to enhance the adhesive strength, a portion of the inner peripheral surface of the grindstone tip where the concave portion is not provided and a portion of the outer peripheral surface of the grindstone base where the groove is not provided. And occupy most of the adhesive area, and these portions are in direct contact with each other without a gap, so that sufficient adhesive strength cannot be secured.

By the way, according to Japanese Patent 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 grindstone tip, and the mounting seats are mounted so that the distance from the outer peripheral surface of the grindstone tip becomes constant. It is known that the concavo-convex shape of the grindstone tip outer peripheral surface after adhesion is eliminated by shaving the tip to provide a mounting surface, and according to this, the inner peripheral surface of the grindstone tip and the outer peripheral surface of the grindstone base are Although a gap is secured between the two, the mounting surface position is based on the outer peripheral surface of the grindstone tip, so the height of the mounting seat from the inner peripheral surface of the grindstone tip is not constant, so the adhesive strength is not uniform. In addition, a step of separately providing each mounting seat and a cutting step for providing the mounting seat are required for each of the plurality of grinding stone chips.

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

[0008]

In order to achieve the above object, the invention according to claim 1 is to provide an outer periphery of a whetstone base with a large number of whetstone tips molded in an arc plate shape with ultra-hard abrasive grains and a bonding material. In the case of a grinding wheel adhered to a surface, a plurality of mounting seats having a seating surface is provided on the inner peripheral surface of the grindstone tip at a constant radial position from the inner peripheral surface of the grindstone tip, and the seating surfaces contact the grindstone base. The inner peripheral surface of the grindstone tip is bonded to the grindstone base.

According to a second aspect of the present invention, a large number of arc plate-shaped grindstone chips, which are molded into an arc plate shape with super-hard abrasive grains and a bonding material, are adhered to the outer peripheral surface of the grindstone base by an adhesive agent. In the method for manufacturing, a grindstone tip is molded using a mold having a plurality of recesses of a constant depth on the mold surface that is the molding surface of the inner peripheral surface of the grindstone tip, and the recess is formed on the inner peripheral surface of the grindstone tip. The mounting seat of a certain height having a seating surface at the tip is integrally projected with respect to the grindstone tip, and the seating surface is seated on the outer peripheral surface of the grindstone base, and the inside of the grindstone tip is glued. The feature is that the peripheral surface is bonded to the grindstone base.

[0010]

According to the invention of claim 1, 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, which grindstone tip Also, a constant gap is formed between the inner peripheral surface of the grindstone tip and the outer peripheral surface of the grindstone base. Since the adhesive is filled in this gap, the thickness of the adhesive is kept constant, it is strong,
And stable adhesive strength can be obtained.

According to the second aspect of the present invention, when the inner peripheral surface of the grindstone tip is molded by using a mold having a plurality of concave portions with a constant depth on the surface, abrasive grains are also filled in the concave portions.
As a result, a mounting seat having a constant height is formed at the same time when the grindstone tip is molded.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a grinding wheel of the present invention, in which a large number of arc 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. Grindstone tip 3
It is called a vitrified grindstone in which ultra-hard abrasive grains such as diamond and cubic boron nitride are kneaded together with a vitreous binder and fired, and have a thickness of about 3 mm.

As shown in FIG. 2, the grindstone tip 3 is formed by being sandwiched between an upper mold MU and a lower mold ML which are opposed to each other along a guide SG so as to move back and forth. The grindstone tip 3 is molded into an arc plate shape as described above, but the lower die ML forms an arc outer peripheral surface 3a and the upper die ML forms an arc inner peripheral surface 3b.
Is formed. A plurality of recesses H having a constant depth are provided on the molding surface of the upper mold MU, and when the grindstone tip 3 is molded using the upper mold MU, the abrasive grains are also filled in the recesses H.
On the inner peripheral surface 3b of the grindstone tip 3, a projection-shaped mounting seat 5 is formed as shown in FIG. By the way, even if the amount of abrasive grains filled between the upper die MU and the lower die ML varies to some extent, the height of the mounting seat 5 is determined by the depth of the recess H only by varying the thickness of the abrasive stone tip 3. All chips 3 have a constant height. The tip of the mounting seat 5 constitutes a seating surface 5a that comes into contact with the outer peripheral surface 2 of the grindstone base 1.

After the grindstone chips 3 thus formed are fired, as shown in FIG. 4, first, an appropriate amount of adhesive is applied to the outer peripheral surface 2 of the grindstone base 1 to form minute gaps between the grindstone chips 3. While arranging the outer peripheral surface 2 in order, the outer peripheral surface 3a of the grindstone tip 3 is further squeezed by a belt or the like (not shown) to bring the seating surface 5a into close contact with the outer peripheral surface 2. Then, the adhesive 4 is pushed out at the portion of the seating surface 5a, and the seating surface 5a comes into contact with the outer peripheral surface 2 through 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 grindstone base 1 and the inner peripheral surface 3b of the grindstone tip 3.

If the thickness of the grindstone tip 3 varies, the outer peripheral surface of the grindstone becomes uneven, and dressing is required. However, the thickness of the grindstone tip 3 is different between the upper mold MU and the lower mold ML as described above. Since the amount of abrasive grains filled in between is determined, if the amount is controlled to be constant, the irregularities generated on the outer peripheral surface of the grindstone can be suppressed minutely, and the dressing amount can be small.

In the above embodiment, the adhesive 4 may be an epoxy adhesive or any other suitable adhesive, and the shape of the mounting seat is not limited to the illustrated circular shape but may be linear. Further, as the abrasive grains of the grindstone tip 3, abrasive grains such as alumina or nitrogen carbide can be mixed in addition to the above-mentioned ultra-hard abrasive grains, and as the binder, besides the vitreous binder, a resin binder or A resinoid grindstone or a metal bond grindstone may be used by using a metal bond material or other materials. In addition, in the above-mentioned example, although the one made of metal was used as the grindstone base,
Resin such as FRP or ceramic may be used.

[0017]

As is apparent from the above description, according to the invention of claim 1, since the thickness of the adhesive can be made uniform for each grindstone tip, the adhesive strength of each grindstone tip becomes constant. Further, since the inner peripheral surface of the grindstone tip does not have unevenness, the life of the grindstone does not vary among the grindstone tips.

According to the second aspect of the present invention, since the mounting seat for keeping the thickness of the adhesive constant is formed at the same time when the grindstone tip is molded, the number of manufacturing steps of the grindstone can be reduced.

[Brief description of drawings]

FIG. 1 is a diagram showing the structure of the entire grindstone.

FIG. 2 is a diagram showing a method for molding a grindstone tip.

FIG. 3 is a diagram showing the shape of a mounting seat.

FIG. 4 is a diagram showing a bonded state of a grindstone tip.

[Explanation of symbols]

 1 Grindstone base 2 Outer peripheral surface (of grindstone base) 3 Grindstone tip 4 Adhesive 5 Mounting seat 5a Seating surface

Claims (2)

[Claims] 1. A grinding wheel formed by adhering a large number of grinding wheel chips, which are formed into an arc plate shape with super-hard abrasive grains and a bonding material, to the outer peripheral surface of a grinding wheel base. A plurality of mounting seats having a seating surface at a constant radial position from the inner peripheral surface of the tip are provided, and the seating surface is brought into contact with the grindstone base to bond the inner peripheral surface of the grindstone tip to the grindstone base. Grinding wheel to do. 2. A method for producing a grinding wheel by adhering a large number of arc plate-shaped grindstone chips, which are molded into an arc plate shape with super-hard abrasive grains and a binder, to the outer peripheral surface of a grindstone base with an adhesive. , A grinding wheel chip is molded using a mold having a plurality of recesses of a constant depth on the mold surface to be the molding surface of the inner peripheral surface of the grinding wheel chip, the inner peripheral surface of the grinding wheel chip, is molded in the recesses, A mounting seat having a seating surface at the tip is projected integrally with the grindstone tip, and the seating surface is seated on the outer peripheral surface of the grindstone base, and the inner peripheral surface of the grindstone tip is ground by an adhesive. A method for manufacturing a grinding wheel, which is characterized by being bonded to a base.