JPS58181576A - Grinding wheel - Google Patents

Abstract

PURPOSE:To increase the contact area between a grinding cloth sheet and a surface to be ground to achieve precise finish grinding by planting fixedly the grinding cloth sheet spirally on a wheel base plate to make the outermost peripheral portion higher than the inner peripheral portion. CONSTITUTION:A grinding cloth sheet 1 is fixedly planted spirally on a flat plate portion 2b of a wheel base plate 2 at proper intervals with the grain surface being directed outward, and the height of the outermost peripheral portion 1a of the grinding cloth 1 from the wheel base plate 2 is made the highest. When the grinding operation is carried out obliquely to the surface X-X to be ground, the contact area between the most effectively operative outermost peripheral portion 1a and said surface X-X is enlarged and one corner a will do. Even when the operation successively proceeds and the inside grinding cloth sheet 1 participates in the operation, the contact area is large as well so that finish ground surface is not coarse and the grinding wheel is prevented from deformation by a strong righting moment of spiral cylindrical portion.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a polishing wheel used for polishing the surfaces of various objects such as metals, non-metals, and wood. It is an object of the present invention to provide a polishing wheel that improves efficiency, prevents deformation during use, and has a long life.

Conventional tools used for surface polishing generally include flexible grindstones or wheels in which sandpaper or the like is adhesively fixed to the entire surface of the wheel substrate.

The former has a rough polished surface (the latter has a good polished surface, but it is inefficient, such as clogging during polishing, burning due to temperature rise, and short life. Therefore, in recent years, the polishing surface is shown in Figures 1 and 2. As <
A polishing wheel is used in which a plurality of coated abrasive papers such as ribbon-shaped sandpaper are planted and fixed in a radial manner and are polished once. In this case, the lower edge of ribbon-shaped coated abrasive paper 1 such as sandpaper is adhered with adhesive such as epoxy resin and fixed in a radial manner on the surface of 2 wheel substrates that have a center hole 3 that serves as a mounting hole for the grinder. In Although.

When performing polishing work with this type of polishing wheel, generally when performing polishing work, apply coated abrasive paper to the surface to be polished for 15 to 30 minutes.
Polishing is carried out by making it contact the surface to be polished at an angle of 25 degrees. At this time, the coated abrasive paper fluttering and polishing due to high-speed rotation, so the corner a of the radial coated abrasive paper 1, which is planted immediately after use, is bent in the pressing direction due to the pressing pressure, and is deformed and loses its restoring force (as a result, it becomes impossible to apply grinding pressure, the polishing force is extremely reduced, and the erected polishing cloth Complete use of paper is often extremely difficult.

As shown in Figure 3, an improved version of this has been used in which several sheets of abrasive coated paper 1 are planted together to strengthen the structure, but in either case, the restoring force to return to the original shape is reduced, as described above. There is not much difference from the examples shown in FIGS. 1 and 2.

Further, as shown in FIGS. 4 and 5, a ribbon-like long coated abrasive paper 1 is planted and fixed in a spiral shape at intervals on a substrate 2 to form a cylindrical shape, thereby utilizing its restoring force. A type of polishing wheel that prevents the coated abrasive paper 1 planted upright from falling down may also be considered, but in this case, it compensates for the drawbacks of a commercially available abrasive wheel equipped with radial coated abrasive paper as shown in FIG. However, according to experiments conducted by the present inventors, it was found that this method also has drawbacks. The biggest thing is that the coated abrasive paper 1 located at the outermost periphery is stronger than expected.

The roughness of the surface to be polished is large. This occurs during polishing work as described above (when the coated abrasive paper is brought into contact with the surface to be polished at an angle of 15° to 25°, multiple corners a of the upper end of the coated abrasive paper at the outermost periphery This is because scratches are generated at the corner a when the polishing surface comes into contact with the surface to be polished.

Therefore, in order to compensate for this drawback, we experimented with the type shown in Figures 6 and 7, which consists of a spiral coated abrasive paper 1
Lower the outer periphery of ((normal height).

The inner row (according to the height (higher than normal), and the height difference were made.As a result of this experiment, the outermost abrasive cloth paper does not hit the surface to be polished alone (, The cloth abrasive paper immediately inside the abrasive paper also participated in the abrasive work at the same time, as shown in Figure 4.

Compared to the spiral coated abrasive paper format shown in FIG. 5, roughness of the abrasive surface could be prevented. (Perform the polishing work by moving the grinder back and forth and left and right.) However, these figures 6 and 7
The polishing wheel shown in the figure has the disadvantage that the area of surface contact at the outermost periphery is small. This is most effective because there is less surface contact at the outermost periphery.

A plurality of corner portions a of each upper end corner portion a of each layer of the spiral coated abrasive paper 1
It is good for somewhat rough polishing because it comes into contact with the middle polisher at the same time, but it is not suitable for fine finishing polishing.

The present invention improves one or more various defects, increases the surface area of the coated abrasive paper in contact with the surface to be polished, enables precision finish polishing, and increases restoring force during polishing operations to prevent deformation.
It is an object of the present invention to provide a polishing wheel that does not cause roughness due to scratches on the polished surface as shown in Figures 4 and 5, and can make the polished surface more beautiful than that shown in Figures 6 and 7.
Ribbon-shaped coated abrasive paper is planted and fixed in a spiral shape on the surface of the wheel substrate at appropriate intervals. It is characterized by the following.

Examples of the present invention will be described below.

First, in Figures 8 and 9, 1 is abrasive cloth paper.

2 is a wheel substrate on a disk; 6 is a center hole for attaching the polishing wheel of the present invention to a grinder.

The coated abrasive paper 1 is sandpaper or sand net made of paper or a net made of fibers such as glass or resin, and has abrasive grains attached to its surface. The ribbons are cut into ribbons and fixed on the flat plate part 2b of the wheel base plate 2 in a spiral shape with the abrasive grain side facing outward at appropriate intervals. Align the lower edge of 1 with the flat plate part 2a of the wheel board 2.

Alternatively, it may be fitted into a groove on the flat plate portion 2a, planted and fixed with an adhesive such as an epoxy resin via a reinforcing cloth if necessary, and any conventionally known method may be used.

The coated abrasive paper 1 is formed such that the outermost peripheral part 1a is the highest (higher than the normal height), and the innermost peripheral part 1d is the lowest (normal height) so that the innermost peripheral part 1d is the lowest (normal height). There is.

10 and 11 show other embodiments of the wheel substrate 2.
A raised part 2b is provided on the outer peripheral part of the mounting surface 2a from the center hole 6 toward the outer peripheral direction, and the coated abrasive paper 1 is applied from the outside to the downward surface 2C of the raised part 2b. The height is the highest, the height is lowered according to the inner row, and the innermost circumference 1d is the shortest.

The upper end of the coated abrasive paper 1 is on the same surface, and the other configurations are the same as those in FIGS. 8 and 9.

As described above, in the polishing wheel of the present invention, the coated abrasive paper is spirally planted and fixed on the surface of the wheel substrate, and the height of the coated abrasive paper from the wheel substrate is made highest at the outermost periphery. When performing polishing work at an angle to X-X, the surface to be polished at the outermost periphery
-The surface contact area for X-rays is large, and the corner a is 1
Similarly, as the work progresses, the area of surface contact becomes thicker when cutting the inner abrasive coated paper. Roughness no longer occurs.This is because, as mentioned above, the area of surface contact is large, and by increasing the height of the outer periphery, the length from the wheel base increases, making it easier to bend. This is thought to be due to a reduction in the paper biting phenomenon.Also, due to the spiral shape, the conventional examples shown in Figures 1 and 2 have a flat plate shape, so the restoring force of the abutting part is weak and deformation easily occurs. However, in the present invention, there is no deformation due to the strong restoring force of the spiral cylindrical portion.Furthermore, the spirals are formed at appropriate intervals.

Appropriate restoring force is obtained, and the heat generated during contact during polishing work is dissipated from the spiral spacing due to centrifugal force due to high-speed rotation, so there is no risk of burning the coated abrasive paper or burning the surface to be ground, resulting in matting. Furthermore, the centrifugal force causes the grinding debris to be discharged to the outside, thereby avoiding clogging of the coated abrasive paper.

However, in the case of using the grinding wheel shown in FIG. 8 and ttf], it is used at a commonly used grinder angle (15 to 25 degrees with respect to the surface to be polished).

It is not possible to completely eliminate surface roughness due to the coated abrasive paper biting into the surface to be polished. Therefore, in order to obtain a more beautiful finished surface using an ordinary grinder, the method shown in Figures 10 and 11 is as shown in Figures 10 and 11. By forming the polishing surface on an inclined surface, flexibility can be obtained in the substrate, and the contact pressure to the surface to be polished can be reduced, making it easier to obtain a more beautiful finish.

Since the upper end of each spiral coated abrasive paper is flush, it is possible to increase the contact pressure and perform rough polishing, and the part below the polishing angle Usable and no waste.

As mentioned above, sandpaper and sandnet have been described as coated abrasive paper, but the difference in performance between the two is that when grinding and polishing non-ferrous metals such as gunmetal and lead, sandpaper is more likely to become clogged with metal powder. However, this phenomenon hardly occurs with Sandnet.

Above, we have explained the polishing wheel with emphasis on polishing to obtain the most beautiful polished surface possible.

All of them are only for polishing and have little grinding ability. Depending on the workpiece, a certain amount of grinding is required to remove weld marks or extreme distortion, but the grinding wheels shown in Figures 12 and 13 were developed because it was thought to be appropriate in cases where a flexible grindstone would grind too much. As shown in the figure, this polishing wheel is made by stacking coated abrasive paper in two layers (Fig. 13 (la, 4a)).
By doubling, the resistance to bending increases greatly, so it is possible to grind and polish while applying pressure, and the working time can be increased (shortened), but the surface to be ground is not as shown in Figures 8 to 11 above. The flat surfaces of various polishing wheels and the like are not included.Other configurations are the same as in FIGS. 8 and 9.

The experimental results of grinding and polishing using the various polishing wheels listed above are shown in the table below.

(Experimental conditions) Grinder used: Hitachi PDA-
100A type 1 rotation speed 12000 times/min, grinding and polishing time
5 minutes, material to be ground: 5s41. As a result of using abrasive grains of alumina No. 60 or higher used in the sandpaper, good results were obtained in Figures 8 to 13 of the present invention.

[Brief explanation of the drawing]

1 and 2 are a perspective view and a vertical sectional view, respectively, of a conventional polishing wheel, and FIG. 3 is a front view and a front view of another conventional polishing wheel.
Figures 6 and 7 are perspective views and vertical cross-sectional views, respectively, of the polishing wheel used in the experimental example, Figures 6 and 7 are perspective views and vertical cross-sectional views, respectively, of other experiments, and Figures 8 to 13 are the main FIG. 8 is a perspective view of one embodiment of the invention polishing wheel, FIG. 9 is a vertical sectional view thereof, No. 10 is a perspective view of another embodiment, and No. 11 is a perspective view of an embodiment of the invention polishing wheel.
12 is a perspective view of another embodiment, and FIG. 13 is a longitudinal sectional view thereof. 1. Abrasive cloth paper, 2. Wheel substrate, 6. Center hole.

Claims (3)

[Claims] (1) Polishing characterized by fixing coated abrasive paper in a spiral manner on the surface of the wheel substrate at appropriate intervals, and setting the height of the coated abrasive paper so that the outer circumference is higher than the inner circumference. wheel. (2) The polishing wheel according to claim 1), characterized in that the coated abrasive paper is stacked and fixed in two layers. (3) A polishing wheel according to claim (1) or (2), wherein the substrate surface is formed as an inclined surface curved in an anti-warped shape.