JPH0215979A - Grinding tool - Google Patents

Abstract

PURPOSE:To make it possible to efficiently grind two opposing faces in a groove without shifting a hand grinder from one hand to the other by lapping and sticking the back face having no abrasive grains of circular abrasive boards on both faces of a circular board through adhesive. CONSTITUTION:Circular grinding boards 4, and 4', are made up by overlapping the side edges of a multiple number of rectangular abrasive sheet 5 having abrasive grains on one side, and radially arranging and assembling them. Back faces of the circular grinding boards, 4 and 4', which have no abrasive grains, are respectively stuck through adhesive on both the front and back sides of a circular board 1 which has a penetrated hole 2 for a drive shaft at its center. When a grinding tool is made with a circular board 1 and two circular grinding boards 4, and 4', as described above, two opposing faces in a groove can be ground with two circular grinding boards, 4 and 4', without shifting a hand grinder from one hand to the other.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a polishing tool in which a large number of rectangular polishing sheets are arranged radially.

[Conventional technology]

Conventionally, a polishing tool using a large number of rectangular abrasive sheets has a ring-shaped abrasive plate formed by overlapping the side edges of a large number of rectangular abrasive sheets and gathering them radially, as shown in Japanese Utility Model Publication No. 63-4608. It consists of a disk made of fiberboard or metal that has a through hole for the drive shaft in the center, and an annular polishing plate is bonded to one side of the disk with an adhesive.

[Problem to be solved by the invention]

Since the annular polishing plate is provided on only one side of the disk, when polishing two opposing sides of a groove, for example, a recessed surface, the hand grinder must be changed, which takes a considerable amount of time and reduces polishing efficiency.

There was also the problem that the bottom surface of the groove could not be polished well.

In addition, when grinding the surface of a welded part built up on a groove other than the above-mentioned groove, the hand grinder is changed in the same way as described above.

[Means to solve the problem]

In order to solve the above-mentioned problems, this first invention overlaps the side edges of a large number of rectangular polishing sheets, and has two annular polishing plates provided in a radial arrangement and a center. The abrasive-free back surface of the annular polishing plate is superimposed and fixed to both surfaces of the disc via an adhesive via an adhesive.

The second invention includes two annular polishing plates in which the side edges of a large number of rectangular polishing sheets overlap and are arranged in a radial manner, and a through hole for a drive shaft is provided in the center. The inner periphery of the back surface without abrasive grains of the annular polishing plate is overlapped and fixed to the periphery of both sides of the disc via adhesive, and the outer periphery of the disc of both annular polishing plates is Adhesive is filled in the gap on the back surface of the part that protrudes from.

[Effect]

A polishing tool is attached to the drive shaft of a hand grinder, and polishing is performed using annular polishing plates on both sides while rotating the polishing tool.

〔Example〕

1 and 2 show an embodiment of the first invention, in which 1 is a disk having a through hole 2 for a drive shaft in the center, and an adhesive 3 is applied to both sides of the circle Fi. Through the annular polishing plate 4
．． 4' non-abrasive back side is pasted.

The annular polishing plate 4,4' is made of paper or cloth, and is formed by overlapping the side edges of a large number of rectangular polishing sheets 5 having abrasive grains on one side, and arranging and collecting them radially.

Further, the exposed edges of each polishing sheet 5 are positioned in the opposite direction to the rotation direction.

Further, the above-mentioned disk 1 may be made of fiberboard or the like in addition to metal or synthetic resin, and as shown in the figure, a dish-shaped disk 1 may be used.
A dish-shaped body 7 in which the central through-hole 6 is aligned with the through-hole 2 is stacked on the center of the back surface (concave side surface) of By pouring the adhesive 9 into the stepped portion obtained by the curved inclined surface of the disk 1, the inner peripheral edge of each polishing sheet 5 can be firmly supported.

FIG. 3 shows an embodiment of the second invention, in which the gap between the back surfaces of the portions of both annular polishing plates 4 and 4' that protrude from the outer peripheral edge of the disc 1 is filled with an adhesive 9, and the adhesive The two annular polishing plates 4.4' are glued together via the adhesive 9.

In addition, if abrasive grains are mixed into the filling adhesive 9,
The polishing effect using the outer peripheral edges of both annular polishing plates 4,4' can be significantly improved.

〔effect〕

As described above, according to the polishing tool of the present invention, since the annular polishing plates are attached to both sides of the disc, it is possible to polish, for example, two opposing sides of a groove without changing the hand grinder. .

Furthermore, since the gap between the back surfaces of the portions of the annular polishing plates protruding from the outer peripheral edges of the disks is filled with adhesive, the back sides of both the annular polishing plates are bonded together.

Therefore, there is no bending of the outer edge of the rectangular polishing sheet during pressure polishing, and the bottom of the groove can also be polished by the outer peripheral edges of both annular polishing plates.

[Brief explanation of the drawing]

The drawings show a polishing tool according to the present invention; FIG. 1 is a perspective view, FIG. 2 is an enlarged vertical front view of the same, and FIG. 3 is an enlarged vertical front view of another embodiment. 1...Disk, 2...Through hole, 3...Adhesive, 4.4'...
・Annular polishing plate, 9...adhesive.

Claims (2)

[Claims] (1) A large number of rectangular polishing sheets with overlapping side edges, two annular polishing plates arranged in a radial manner, and one circle with a through hole for the drive shaft in the center. A polishing tool consisting of a plate, in which the back surface of the annular polishing plate, which has no abrasive grains, is overlapped and fixed to both surfaces of the disc via an adhesive. (2) A large number of rectangular polishing sheets with overlapping side edges, two annular polishing plates arranged radially, and a single sheet with a through hole for the drive shaft in the center. The inner periphery of the abrasive-free back surface of the annular polishing plate is overlaid and fixed to the periphery of both sides of the disc via an adhesive, and protrudes from the outer periphery of the disc of both annular polishing plates. A polishing tool with adhesive filled in the gap on the back of the part to be polished.