JP2001260037A - Disk-like grinding wheel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disk-like grinding wheel that is suitable especially to rough polishing prior to mirror finishing of a metal plate, metal bar and the like, and can easily offer a uniform wide polished surface. SOLUTION: A disklike backing 1 of glass epoxy has on the top rubber sheets 2 and 3, on which a plurality of abrasive segments 4 are disposed. The abrasive segments 4 are crushed from an abrasive material bonded to the rubber sheet 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grindstone, and more particularly, to a disk-shaped grindstone used for polishing a mirror-finish base of a metal plate, a metal rod or the like.

[0002]

2. Description of the Related Art Conventionally, a rotating disk-shaped grindstone has been used for polishing a hard object such as a metal. This is because, as described in, for example, Japanese Utility Model No. 3064081, a substrate which is attached to a rotating tool such as a grinder and rotates, has a large number of abrasive grains on one surface, and is made of an elastic synthetic resin. In a polishing disk in which a polishing sheet is bonded to a substrate, a synthetic resin having heat generation prevention and abrasive properties is interposed to prevent "burn" and "clogging" caused by a conventional grindstone.

Alternatively, a so-called sandpaper-like grindstone provided with an abrasive layer on a paper base material is superimposed to form a disk, and a radial cutout is provided. The ones arranged radially are used. In addition, a disc-shaped grindstone using glass fiber as a reinforcing material is used. These have a configuration in which the grindstone itself has a certain degree of flexibility, bendability, etc. to obtain a wider polished surface.

[0004]

However, in the structure described in Japanese Utility Model Publication No. 3064081, since the substrate lacks flexibility, flexibility and the like, a uniform and wide polished surface cannot be obtained. . In the above-described configuration using a sandpaper-like grindstone, there is an initial polishing force, but the tip of the abrasive grains wears out during use for a relatively short period of time. Therefore, it is difficult to perform uniform polishing. Further, in the configuration using the above-mentioned disk-shaped grindstone as a reinforcing material of glass fiber, although it has a certain degree of flexibility and flexibility, it is insufficient, so that partial polishing can be performed. However, it is difficult to perform uniform and wide polishing.

[0005] In view of the above problems, the present invention is particularly suitable for polishing a mirror-finished base of a metal plate, a metal bar, or the like, and is capable of easily obtaining a uniform and wide polished surface. The purpose is to provide.

[0006]

In order to achieve the above object, the present invention is characterized in that a plurality of grinding stone pieces are provided on the upper surface of a disk-shaped substrate made of a fibrous material and a resin material. Further, an elastic body is provided between the substrate and the plurality of grinding stone pieces. Further, the plurality of whetstone pieces are formed by breaking a whetstone bonded on a rubber sheet.

The fibrous material is glass fiber, and the resin material is an epoxy resin. In addition, a plurality of grinding stone pieces are provided on the lower surface of the substrate.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a central longitudinal sectional view of one embodiment of the disk-shaped grinding wheel of the present invention. In FIG. 1, reference numeral 1 denotes a disk-shaped substrate supporting the entire disk-shaped grinding wheel G and having, for example, an outer diameter of about 130 mm. Here, the small hole 1a opened in the center is a hole for attaching the substrate 1, that is, the disk-shaped grindstone G, to the rotating shaft of a rotating tool such as a grinder. As a material of the substrate 1, for example, a material obtained by sandwiching a single layer or a plurality of layers of a fibrous material with a resin material plate and thermocompression bonding is used. Specifically, glass fiber is mainly used as the fibrous material, and epoxy resin is mainly used as the resin material, forming a so-called glass epoxy substrate.

On the upper surface of the substrate 1, at least one rubber sheet 2 is adhered concentrically. It is made of a durable soft rubber sheet having a thin donut shape having an outer diameter substantially equal to that of the substrate 1. Further, on the upper surface of the rubber sheet 2, a rubber sheet 3 having substantially the same shape and the same material as this is provided.
Is glued. Here, on the upper surface of the rubber sheet 3,
Grindstone pieces 4 are bonded in advance. The manufacturing process of the whetstone piece 4 will be described below.

First, abrasive grains such as SiC or Al ₂ O ₃
A liquid resin such as a liquid phenol resin is mixed, and the surface of the abrasive grains is uniformly coated with the liquid resin so that the abrasive grains have tackiness. Next, abrasive grains coated with a liquid resin,
A powder resin such as a powder phenol resin is kneaded. Subsequently, the kneaded material is passed through a prescribed sieve to loosen and remove aggregates. The raw material thus prepared is heated at 60 ° C
It is formed by a semi-hot press at about 110 ° C., and finished into a thin donut-shaped grindstone whose outer diameter and inner diameter are almost the same as those of the rubber sheets 2 and 3. Further, firing is performed at 170 ° C to 180 ° C.

After the thin donut-shaped grindstone manufactured as described above is adhered to the upper surface of the rubber sheet 3, a roller or the like is rolled on the surface to break the grindstone, thereby generating a crack or a crack 4a. As shown in a plan view in FIG. 2, each grindstone piece 4 is formed on the rubber sheet 3. The rubber sheet 3 may be formed by bonding a thin donut-shaped grindstone onto a rubber sheet and then punching a rubber sheet according to the outer diameter and inner diameter of the grindstone. Alternatively, the rubber sheet 3 on which the grinding stone pieces 4 are formed may be directly bonded to the substrate 1 without the rubber sheet 2 interposed therebetween. In addition, if a certain amount of gap is provided between the grinding stone pieces 4, free polishing can be performed without limiting the bending direction of the substrate 1.

In the above-described configuration of the disk-shaped grindstone G, when the object to be polished is polished, the grinding wheel piece 4 is pressed against the object to be polished while rotating the substrate 1, that is, the disk-shaped grindstone G with a grinder or the like. Hitting work is performed. At this time,
Since the rubber sheets 2 and 3 transmit the elasticity to the grindstone pieces 4 while being supported by the substrate 1 having excellent flexibility, flexibility, strength, etc., the grindstone pieces 4 are independently formed along the surface of the workpiece. Since it moves, it is possible to perform polishing excellent in familiarity, and to obtain a uniform and wide polished surface.

It is also possible to provide a grindstone piece on the lower surface (opposite surface) of the substrate 1 in the same configuration as that described above to form a disk-shaped grindstone usable on both upper and lower surfaces. At this time, the grain size of the grindstone pieces may be different on the upper and lower surfaces, or may be the same.

The elastic member according to claim 2 corresponds to the rubber sheet 2 or 3 in the embodiment.

[0015]

As described above, according to the present invention,
In particular, a disk-shaped grindstone that is suitable for polishing a mirror-finished substrate such as a metal plate or a metal bar and that can easily obtain a uniform and wide polished surface can be provided.

[Brief description of the drawings]

FIG. 1 is a central longitudinal sectional view of one embodiment of a disc-shaped grinding wheel of the present invention.

FIG. 2 is a plan view showing a state in which each grindstone piece is formed.

[Explanation of symbols]

 1 substrate 2,3 rubber sheet 4 whetstone piece

Claims (5)

[Claims] 1. A disc-shaped grindstone comprising a plurality of grindstone pieces provided on an upper surface of a disc-shaped substrate made of a fibrous material and a resin material. 2. The disk-shaped grindstone according to claim 1, wherein an elastic body is provided between the substrate and the plurality of grindstone pieces. 3. The disk-shaped grinding wheel according to claim 1, wherein the plurality of grinding stone pieces are formed by breaking a grinding stone bonded on a rubber sheet. 4. The disk-shaped grinding wheel according to claim 1, wherein the fibrous material is glass fiber, and the resin material is an epoxy resin. 5. The disk-shaped grinding wheel according to claim 1, wherein a plurality of grinding stone pieces are provided on a lower surface of the substrate.