JP3498387B2 - Polishing rubber sleeve - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polishing rubber sleeve used for polishing a surface of an object having a compound curved surface such as a cathode ray tube panel. . 2. Description of the Related Art A cathode ray tube panel is obtained by press-molding a molten glass lump in a mold, and thereafter, is polished in a polishing step, so that the outer surface thereof is finished smoothly. In this polishing step, since the shape of the CRT panel is a horizontally long rectangle and the outer surface is a compound curved surface, it is practically required to uniformly polish the
There is a problem that is difficult. Conventionally, as shown in FIG. 2, a rubber hollow having both ends air-tightly fastened to a pair of side plates 11 disposed opposite to each other on a rotating shaft 10 and having an appropriate concave groove formed on the outer peripheral surface. Air is supplied into the cylindrical body 12 to rotate it while maintaining a constant internal pressure, and this is pressed against the rotating CRT panel 13 to perform polishing under the supply of abrasive. A conventional rubber sleeve for polishing is disclosed in
As disclosed in Japanese Unexamined Patent Publication No. 5-27518, the shape of the outer peripheral surface in a state where air is supplied to the inside and the internal pressure is kept constant has been used to maintain a straight shape in the axial direction. . [0005] A conventional polishing rubber sleeve has a configuration in which the shape of the outer peripheral surface in a state where air is supplied to the inside to keep the internal pressure constant is such that the shape is straight in the axial direction. It has been considered, for that reason it is rather difficult to deform, does not fit the composite curved surface of the cathode ray tube panel, for example, the center portion of the cathode ray tube panel is polished best, the polishing amount decreases toward the periphery, There was a problem that each part could not be polished uniformly. In addition, this causes uneven wear of the polishing rubber sleeve, and when polishing another type of cathode ray tube panel, there is a disadvantage that uniform polishing cannot be performed more and more. Conventionally, in order to prevent uneven wear of the polishing rubber sleeve,
The position of the polishing rubber sleeve in the axial direction is changed periodically or appropriately, but it is troublesome and troublesome. SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems of the prior art, improve the adaptability of the object to be polished to a complex curved surface, enable uniform polishing of each part, and prevent uneven wear of the rubber sleeve. Accordingly, it is an object of the present invention to provide a polishing rubber sleeve which can eliminate the need for axial position adjustment. [0007] In order to achieve the above object, the present invention is directed to a pair of side plates opposed to each other on a rotating shaft, both ends of which are hermetically fastened and fixed, and an appropriate groove is formed on an outer peripheral surface. A rubber sleeve for polishing, which supplies air into the rubber hollow cylinder formed to rotate and drives while maintaining a constant internal pressure, presses this against the object to be polished, and polishes under the supply of an abrasive, The rubber hollow cylinder has a thick-walled part integrated on the inner peripheral surfaces of both ends.
Or it is formed as a separate body and the other parts are uniform
It is formed as a wall thickness, or its wall thickness is
Section and the thickness gradually increases toward the axial ends.
Is formed in Kunar so has become easier central portion in the axial direction is expanded, and the state before the air supply to the interior
With a uniform outer diameter over the entire length in the axial direction, when air is supplied to maintain a constant internal pressure, the outer diameter increases from both ends in the axial direction toward the center in the axial direction. It is configured to be gradually increased and to be elastically deformed and expanded so that the outer diameter becomes maximum at the central portion in the axial direction, and to be used at the time of this expansion . The polishing rubber sleeve of the present invention is designed such that when air is supplied to the inside of a rubber hollow cylinder to maintain a constant internal pressure, the polishing rubber sleeve extends from both ends in the axial direction toward the center in the axial direction. The outer diameter gradually increases, and the shape is expanded and elastically deformed so that the outer diameter becomes maximum at the central portion in the axial direction, so that the object to be polished easily deforms in conformity with the complex curved surface. That is, the central portion of the rubber hollow cylindrical member constituting the polishing rubber sleeve of the present invention is easily expanded. The fact that the central portion expands easily as described above means that the central portion has a soft property, which indicates that elastic deformation is easy when pressed against the object to be polished. By easily elastically deforming the polishing rubber sleeve in this manner, when the rubber sleeve is pressed against the compound curved surface of the object to be polished, a region from the central portion to the peripheral portion of the compound curved surface of the object to be polished, The rubber sleeve is elastically deformed and comes into contact with the rubber sleeve so as to radially expand the contact area. Thereby, the close fit of the rubber sleeve and the complex curved surface of the object to be polished is improved. As a result of the improvement of the close fitting property of the object to be polished to the composite curved surface, the internal curved surface of the object to be polished can be uniformly polished by the internal pressure uniformly acting on each part of the rubber sleeve. Accordingly, uneven wear of the polishing rubber sleeve is prevented, and the axial position adjustment can be eliminated. FIG. 1 is a partially cutaway front view showing a use state of a polishing rubber sleeve according to the present invention.
2 is a bearing, 3 is a side plate, 4 is a hollow cylindrical body made of rubber, 5 is an air supply pipe, 6 is a rotary joint, 7 is an object to be polished, exemplifying a CRT panel, and 8 exemplifies a rotary table. . The rotating shaft 1 is rotatably supported at both ends by bearings 2 and is driven to rotate by a drive motor (not shown). Side plates 3 are mounted near both ends of the rotating shaft 1, and both ends of a rubber hollow cylinder 4 are airtightly fixed to the side plates 3 via tightening bands 9. An air supply pipe 5 is connected to one end of the rotary shaft 1 via a rotary joint 6.
The air is supplied into the rubber hollow cylindrical body 4 through the air supply passage 1a, and the internal pressure is kept constant. On the outer peripheral surface of the rubber hollow cylinder 4, an appropriate concave groove 4a for enhancing the polishing effect is formed.
FIG. 1 illustrates an example in which the corrugated groove is formed so as to be inclined with respect to the axis over the entire length in the axial direction. According to the present invention, when air is supplied to the inside of the rubber cylindrical body 4 to maintain a constant internal pressure, the outer diameter gradually increases from both ends in the axial direction toward the center in the axial direction, The shape is such that it is elastically deformed and expanded so that the outer diameter becomes maximum at the center in the direction. For this purpose, for example, the embedding condition of the reinforcing fibers 4b embedded in the rubber cylindrical body 4 is set over the entire length in the axial direction as shown by a chain line in FIG. When a constant outside pressure is maintained by supplying air to the inside with a uniform outside diameter, the outside diameter gradually increases from both ends in the axial direction toward the center in the axial direction as shown by the solid line in FIG. At least one of the material, the thickness, the number of yarns per unit area, and the intersection angle between the warp and the weft yarns of the reinforcing fibers 4b so that the outer diameter increases at the central portion in the axial direction so that the outer diameter becomes maximum. And embedded in the rubber hollow cylinder 4. The conditions for embedding the reinforcing fibers 4b include:
For example, when selecting by material, use a more elastic yarn than before, when selecting by thickness, use a thinner yarn than before, and when selecting by the number of yarns per unit area, In the case of reducing the number of yarns compared to the conventional one and selecting at the intersection angle between the warp and the weft, the bias type has been used in which the conventional arrangement of the warp is parallel to the axis and the weft is arranged to intersect the warp at a right angle. And at least one of them may be selected and embedded in the rubber cylinder 4. The reinforcing fibers 4b are embedded in a coarse cylindrical woven fabric over the entire length in the axial direction. In addition to the above configuration, a thick portion 4c is integrally formed on the inner peripheral surfaces of both ends of the rubber cylindrical body 4 and the other portions have a uniform thickness, thereby further expanding the expanded shape of the present invention. It can be easily realized. The thick portion 4c may be formed by bonding a separately molded annular body with an adhesive. In addition, the thickness of the rubber cylindrical body 4 may be such that it is thinnest at the central portion in the axial direction and gradually increases toward both ends in the axial direction. The polishing rubber sleeve of the present invention has the above-mentioned structure, and its operation will be described below. The rubber hollow cylindrical body 4 is tightly fixed at both ends thereof to the side plates 3 at both ends of the rotating shaft 1 via a tightening band 9. Then, air is supplied from the air supply pipe 5 to constantly maintain a constant internal pressure. As a result, the outer diameter of the rubber hollow cylinder 4 gradually increases from both ends in the axial direction toward the central portion in the axial direction, as shown in FIG. 1, and the outer diameter becomes maximum at the central portion in the axial direction. Inflates like this. However, if the internal pressure is removed, the outer diameter becomes uniform over the entire length in the axial direction. The above-mentioned rubber hollow cylinder 4 of the present invention is rotated and driven to press against the compound curved surface of the polished body 7 shown in FIG. The object to be polished 7 is positioned and held on a turntable 8 via a jig (not shown), and is rotated by the turntable 8 during polishing. The polished body 7 may be polished by being moved linearly in a direction perpendicular to the axial direction of the rubber hollow cylinder 4 instead of the rotary table 8. In any case, the abrasive is supplied from the side of the body 7 to be polished. The rubber hollow cylinder 4 pressed into contact with the body 7 to be polished
The central portion in the axial direction is the most easily deformed, and elastically deforms so as to be easily fitted to the complex curved surface of the polished body 7. Even if elastic deformation occurs in this way, since the internal pressure is uniformly applied to each portion in the rubber hollow cylinder 4, a uniform polishing pressure is applied to the entire composite curved surface of the polished body 7. Thus, the body 7 can be uniformly polished. At the same time, uneven wear of the polishing rubber sleeve is prevented. The expansion deformation range or the elastic deformation range of the rubber hollow cylinder 4 is set so that the polishing action does not reach around the side surface of the polished body 7 when pressed against the polished body 7. Needless to say, it is not affected. According to the present invention, when air is supplied to the inside of the polishing rubber sleeve, the center portion is elastically deformed and expanded so as to have a maximum outer diameter. In addition, the flexibility of the rubber sleeve is increased, and the close fit of the polished body to the composite curved surface is improved. In addition, since the internal pressure acting on each part in such a state that it is elastically deformed flexibly and closely adhered to the composite curved surface of the object to be polished is uniform, the composite curved surface of the object to be polished can be uniformly polished, As a result, uneven wear of the polishing rubber sleeve is prevented, and the axial position adjustment can be made unnecessary.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partially broken front view showing a use state of a polishing rubber sleeve according to the present invention. FIG. 2 is a front view showing a usage state of a conventional polishing rubber sleeve. [Description of Signs] 1 Rotary shaft 2 Bearing 3 Side plate 4 Hollow cylindrical body 4a made of rubber Concave groove 5 Air supply pipe 6 Rotary joint 7 Polished body 8 Rotary table 9 Tightening band

Claims (1)

(57) [Claim 1] A rubber hollow cylinder having both ends airtightly tightly fixed to a pair of side plates opposed to each other on a rotating shaft and having an appropriate concave groove formed on an outer peripheral surface. and supplying air driven rotation by maintaining a constant internal pressure, which an abrasive rubber sleeve is polished under supply of the abrasive is pressed against the material to be polished, the rubber hollow cylinder, the Thick portions on the inner peripheral surfaces at both ends
It is formed as one piece or separate body and other parts
Is formed as the same thickness, or the thickness is
It is thinnest at the center and gradually toward both ends in the axial direction.
It is formed so as to be thicker , its central portion in the axial direction is easy to expand, and before the air is supplied to the inside.
In the state, it has a uniform outer diameter over the entire length in the axial direction, and when air is supplied inside to maintain a constant internal pressure,
The outer diameter gradually increases from both ends in the axial direction toward the central portion in the axial direction, and is elastically deformed and expanded so that the outer diameter becomes maximum at the central portion in the axial direction, and is configured to be used at the time of this expansion. A rubber sleeve for polishing.