JPH0338072B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a polishing tool used for polishing molds and the like.

[Prior Art] In press molds and the like for press-forming steel plates, such as the bodies of automobiles, it is necessary to polish the protruding surfaces of the molds that come into contact with the steel plates to a smooth surface. If the protrusions of the mold are insufficiently polished, friction will increase between the protrusions of the mold and the steel plate to be press-formed, resulting in problems such as the steel plate being torn during press-forming. For this purpose, workers traditionally use abrasive paper or abrasive cloth to polish the protrusions of the mold by pressing the abrasive paper with the palm of their hands or fingertips, and then change the abrasive paper sequentially from coarse to fine abrasive paper. The mold was polished until it had a mirror-like smooth surface.

Conventional polishing tools such as abrasive paper and cloth are pressed by the operator's palm or fingertips, and the pressing force is used to polish the mold, so it is not possible to polish a large area at once, and the force acting on the abrasive paper It was difficult to finish the surface with a smooth surface because the surface was not uniform. In addition, polishing required skill and was a difficult task. Furthermore, with conventional polishing tools, it is relatively difficult to use the entire surface of the polishing paper, resulting in a lot of waste.

[Object of the Invention] It is an object of the present invention to overcome the above-mentioned problems and provide an efficient polishing tool that allows easy polishing work and allows use of the entire surface of the polishing tool.

[Structure of the Invention] The polishing tool of the present invention is a curved shell body made of a rubber material formed to a size that can be gripped, and in which a compressible fluid is sealed inside, and the polishing tool is a curved shell body that is made of a rubber material that is formed to a size that can be gripped, and that has a compressible fluid sealed therein. It is characterized by containing abrasive particles.

[Detailed Description of the Structure of the Invention] The curved grain of the polishing tool of the present invention is made of a highly flexible rubber material, is large enough to be gripped, and has a sealed space inside. Suitable rubber materials include rubbers such as natural rubber and synthetic rubber, and soft resins such as ethylene vinyl acetate copolymer. Note that this curvature shell must have excellent airtightness and must not leak the fluid sealed in the internal sealed space. The shape of the curved shell body can be spherical, rugby ball-shaped, or other shapes close to spherical.
Specifically, a tennis ball may be used as the curved shell.

The abrasive particles are held so as to be uniformly distributed and exposed on at least the surface of the curved shell. For example, an adhesive layer may be provided on the outer peripheral surface of the curved shell, and the abrasive particles may be fixed and held via this adhesive layer.

A compressible fluid such as air can be used as the fluid sealed in the closed space inside the curved shell. Air is the most practical option in terms of workability. Note that the pressure of the fluid sealed in the closed space can be arbitrarily selected depending on the object to be polished.

[Effects of the Invention] Since the polishing tool of the present invention has a curved shell of a size that can be grasped, it is convenient to grasp the polishing tool with the palm of the hand and slide the polishing tool against the mold surface. Further, when the polishing tool is pressed against the mold surface by the operator, the pressing force of the operator is converted into fluid pressure in the internal space of the curved shell, and the fluid pressure in the internal space presses the polishing particles against the mold surface. Therefore, the pressing force of the abrasive particles becomes equal to the pressure in the internal space, and an even fluid pressure in the closed space always acts on the mold surface. Therefore, the uniformity of polishing is high. In particular, even when the part to be polished has a spherical convex or concave surface, the pressure acting on each surface is always equal to the fluid pressure in the closed space, and an even pressing force is applied. Therefore, uniform polishing work is possible.

When the polishing tool of the present invention is spherical, its outer surface is the same in all parts. Therefore, by sequentially changing the surface of the polishing tool pressed against the mold surface, the entire surface of the polishing tool can be used uniformly.

In addition, when the polishing tool is rugby ball-shaped, by holding the center part of the rugby ball-shaped polishing tool with your hand and rubbing the center part against the mold surface, it is possible to polish a relatively wide area. becomes. Therefore, a relatively large area can be easily polished at one time.

When the abrasive particles are fixed and held in the adhesive layer, the abrasive particles worn out through use can be regenerated using the adhesive and the abrasive particles again, and the same curved shell can be used to semi-permanently create an abrasive tool. It can be used as

[Example] Examples will be explained below.

Example 1 A central sectional view of a polishing tool according to a first example of the present invention is shown in FIG. This polishing tool consists of a spherical curved shell 1 made of rubber, a polishing member 2 uniformly formed on the entire outer peripheral surface of the curved shell 1, and air 3 sealed in the interior space of the curved shell 1. It is configured. The size of the curved shell body 1 is approximately the same size as a tennis ball, and is small enough to fit in the palm of a human hand. The abrasive member 2 is composed of an adhesive applied to the outer peripheral surface of the curved shell 1 and abrasive particles such as carborundum that are spread and fixed on the surface of the adhesive.
Note that it is preferable that the abrasive particles are fixed in an exposed state on the surface of the adhesive. However, it may be embedded in the adhesive layer. Note that when the abrasive particles are embedded in the adhesive layer, it is preferable that the abrasive particles be spaced apart from each other in order to maintain the flexibility of the adhesive layer.

The polishing tool of this embodiment has the above structure. As shown in FIG. 2, which shows a cross section of the polishing tool in use, the polishing tool is pressed against the protrusion of the mold W by the hand of an operator. The polishing tool is deformed by this pressing force, and a part of the surface of the polishing tool is deformed into a shape along the outer peripheral surface of the protrusion of the mold W, as shown in FIG. In this state, a uniform pressure equal to the pressure P of the air 3 acts on the outer peripheral surface of the mold W. In this state, the polishing tool is moved by the operator in a direction perpendicular to the plane of the paper in FIG. 2 to polish the surface of the protrusion of the mold W. The polishing work uses several types of polishing tools, ranging from coarse to fine abrasive particles, and the surface of the mold W is polished by gradually replacing the polishing tool with coarse abrasive particles with one using fine abrasive particles. This creates a smooth surface that is almost mirror-like. In the polishing tool of this embodiment, it is preferable that the inner peripheral surface of the curved shell 1 be provided with a navel for injecting air, such as that found in soft-ball tennis balls, etc., to arbitrarily adjust the pressure of the air 3 in the internal space. .

Embodiment 2 A polishing tool according to a second embodiment of the present invention is shown in FIG.
Similar to the polishing tool shown in Fig. 1, this polishing tool also has a curved rubber shell, abrasive particles held on the outer circumferential surface of the shell by adhesive so that they are uniformly distributed, and sealed in an internal space. It is made up of air. The polishing tool of this embodiment differs from the polishing tool of FIG. 1 in that its shape is rugby ball-shaped. This polishing tool holds the long axis of the rugby ball shape perpendicular to the direction of polishing.
The operator holds his hand at the center of the top of the polishing tool and moves the tool in a direction perpendicular to the long axis of the tool, polishing the mold over a wide area at once.

[Brief explanation of drawings]

1 and 2 show a polishing tool according to a first embodiment of the present invention, FIG. 1 is a central sectional view thereof, and FIG. 2 is a sectional view of essential parts showing the usage state of the polishing tool shown in FIG. 1. be. FIG. 3 is a plan view of a polishing tool according to a second embodiment of the present invention. 1... Curved shell body, 2... Polishing member, 3... Air.

Claims (1)

[Claims] 1. A curved shell body made of a rubber material formed to a size that can be grasped and having a compressible fluid sealed inside, characterized by having abrasive particles uniformly distributed and exposed on at least the surface. polishing tool.