JPH0417320Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a rotary disk type polishing machine used for removing rust, removing sand from castings, smoothing rough surfaces, and grinding.

<Background of conventional technology and its problems> Conventionally, polishing machines used for removing rust, removing sand from castings, etc. generally have a polishing disk attached to the underside of a rotating disk, and the disk itself does not remove sand from the abrasive material. There are also those in which an endless abrasive belt is stretched between rotating rollers.

Among these polishing machines, those with a polishing disk on the bottom surface of the rotary disk are suitable for polishing flat surfaces of the object to be polished, but they are not suitable for polishing parts such as partially recessed grooves. I can't deal with it. In this regard, endless polishing belts can be used to polish parts with very special shapes, such as inside grooves and holes.

However, even in the case of this endless polishing belt, it is difficult to handle the inside of narrow grooves, especially the inside of concave grooves where the corners are formed at right angles, and polishing becomes impossible. There may be some areas that cannot be polished.

On the other hand, rotating disks made of abrasive material (grindstones) can accommodate the above-mentioned concave grooves depending on the width and thickness of the disk; There are times when it is not suitable.

<Purpose of the invention> The present invention was made in view of the fact that, as mentioned above, conventional polishing machines cannot suitably cope with the shape of the polished part of the object to be polished. The purpose of this was to investigate various types of abrasive belts, and found that if the base fabric of the belt is cut in a state that is not perpendicular to the warp and weft directions, the abrasive may not be adhesively applied. ,
We discovered that a certain degree of expansion and contraction can be obtained, and by utilizing this in the belt, we provided a rotary disk type polishing machine that is particularly effective in polishing special shaped parts such as inside concave grooves, and has a simple structure. It's about doing.

<Structure of the invention> According to the present invention, the cross-sectional shape of the outer peripheral edge of the rotary disk having a polishing portion on at least the lower surface is formed into a semicircular, triangular, or polygonal shape, and the outer peripheral edge of the rotary disk is provided with warp threads of the base fabric. The direction and the weft direction cross the length direction of the base fabric in a non-orthogonal state, and the endless belt for polishing is formed so that it can expand and contract in the length direction, and the belt is stretched and fitted, and its contractile force Accordingly, the endless belt for polishing is brought into close contact with the outer peripheral edge of the rotating disk, so that both the rotating disk and the endless belt for polishing can be used as a polishing section.

<Embodiment> FIG. 1 is a perspective view showing one embodiment of the present invention.

This polishing machine has an air turbine built into the main body 1, and when a control lever 2 is squeezed, an operation valve (not shown) opens and a rotary disk 3 attached to the tip of the main body rotates at high speed. Like the rotary disk, it is removably attached to a chuck 4 provided at the tip of the main body. 5 is a mounting shaft.

An endless polishing belt 6, described below, which has a wide width approximately equal to the thickness of the rotary disk 3 is fitted onto the outer peripheral edge of the rotary disk 3.

As shown in FIG. 3, this endless belt for polishing 6 is made by coating one side of a base cloth 7 with an abrasive 8. As shown in FIG. 2, this base fabric 7 is
The warp 7a and the weft 7b, which are constituent fibers, are cut so that the directions thereof form an angle of 45° with respect to the length direction of the base fabric, that is, the length direction of the belt.
Therefore, as shown in the figure, the base fabric 7 stretches somewhat in the length direction of the belt, and during this stretching, the width contracts somewhat. Therefore, the endless belt for polishing 6
is formed to be slightly shorter than the circumferential length of the rotary disk 3, and is stretched out when fitting.

For this endless polishing belt 6, the cross-sectional shape of the outer peripheral edge of the rotary disk 3 is not particularly limited, but may be semicircular, triangular, square, or polygonal in order to obtain a good polishing effect. can do. FIG. 4 shows a case where the outer peripheral edge shape is semicircular, and FIG. 5 shows a case where the outer peripheral edge shape is triangular. At this time, the endless polishing belt 6 is stretched more at the center of the outer peripheral edge of the rotary disk 3, and rather contracts at both ends in the width direction, so that it does not easily come off during use. 6 and 7, semicircular grooves 9 or triangular grooves 9' are formed on the outer peripheral edge of the rotary disk 3, and elastic rubber rings 10 with circular cross-sections are installed in these square grooves 9, 9'. Alternatively, an elastic rubber ring 10' having a diamond-shaped cross section is fitted, and an endless polishing belt 6 is fitted around the outer periphery of these rings 10, 10'. According to this structure,
Due to the synergistic effect of the elastic action of the endless polishing belt 6 and the elastic action of the rubber rings 10, 10',
The belt is more effectively prevented from coming off. In addition, the polishing material hits the object to be polished more softly and penetrates into fine details better. In addition, rubber ring 10,
The material 10' may be replaced by another material having elasticity similar to rubber, such as elastic plastic.

In order to polish the surface of an object to be polished using the rotating disk type polishing machine of the present invention, the rotating disk 3 is rotated at high speed and the endless polishing belt 6 on the outer periphery is pressed against the target part. . This endless belt 6 is fitted to the outer peripheral edge of the rotary disk 3, and since its outer peripheral surface is semicircular, triangular, square, or polygonal, it can be used for polishing specially shaped parts of the object to be polished, such as inside concave grooves. can also respond smoothly. Furthermore, when the rubber rings 10, 10' are provided as described above, the elasticity of the rubber allows for better adaptation to the details of the special shape, resulting in even better response. In this case, if several shapes of the rubber rings 10, 10' are prepared in advance, a wider range of shapes can be accommodated.

<Effects of the invention> According to the rotating disk type polishing machine of the present invention, the endless belt for polishing is fitted to the outer peripheral edge of the rotating disk, and the base fabric of the endless belt for polishing has the warp and weft directions corresponding to each other. Since the fabric is cut in a non-orthogonal manner to the length direction of the base fabric, that is, to the length direction of the belt, the following effects can be obtained.

(b) It is very effective when polishing special shaped parts of the object to be polished, such as polishing inside concave grooves.

(b) Also, due to the slight expansion and contraction of the endless polishing belt, it can be easily fitted to the outer peripheral edge of the rotary disk, and will not come off during use. In other words, smooth polishing is possible without the need for a tension mechanism or the like.

(c) The slight expansion and contraction of the endless belt for polishing also acts as a kind of cushioning effect during polishing, and the reaction (vibration) to the operator's hands is small.
It can reduce fatigue even when working for long hours. It also makes contact with the object to be polished softer, allowing for extremely smooth polishing, and at the same time, it penetrates into fine details well, and polishing unevenness is less likely to occur.

[Brief explanation of the drawing]

The drawings show an embodiment of the rotary disk type polishing machine according to the present invention, and FIG. 1 is a perspective view showing the entire polishing machine, FIG. 2 is a rear view showing a part of the endless belt for polishing, and FIG. FIG. 3 is an enlarged vertical cross-sectional view of the polishing belt taken along the line A-A in FIG. FIG. In the figure, 3... Rotating disk, 6... Endless belt for polishing, 7... Base fabric, 7a... Warp, 7b
...Weft, 8...Abrasive.

Claims (1)

[Scope of utility model registration request] The cross-sectional shape of the outer peripheral edge of the rotary disk having a polishing portion on at least the lower surface is formed into a semicircular, triangular or polygonal shape, and the outer peripheral edge of the rotary disk has a warp direction and a weft direction of the base fabric. An endless abrasive belt that intersects non-orthogonally to the length direction and is formed to be able to expand and contract in the longitudinal direction is stretched and fitted, and its contractile force causes the endless abrasive belt to move as described above. Closely contact the outer edge of the rotating disk,
A rotating disk type polishing machine characterized in that both the rotating disk and the endless belt for polishing can be used as a polishing section.