JPH08141898A - Polishing rubber sleeve - Google Patents

Abstract

PURPOSE: To evenly polish the compound curved surface of a body to be polished by providing a rubber hollow cylindrical body, which is elastically deformed for expansion so that the outer diameter thereof is gradually increased from both ends toward a central part in the axial direction thereof and that the maximum outer diameter is formed at the central part in the axial direction. CONSTITUTION: Air is supplied from an air supplying tube 5 so as to always maintain the constant internal pressure. A rubber hollow cylindrical body 4 is expanded so that the outer diameter thereof is gradually increased from both ends toward a central part in the axial direction thereof and that the maximum outer diameter is formed at the central part in the axial direction. The rubber hollow cylindrical body 4, which is made to pressure-contact with a body to be polished on a rotating table 8, is most easily deformed at the central part thereof in the axial direction, and elastically deformed so as to be easily fitted to the compound curved surface of the body to be polished. When the rubber hollow cylindrical body is elastically deformed, since the internal pressure is evenly applied to each part inside of the rubber hollow cylindrical body 4, even polishing pressure is applied to the whole of the compound curved surface of the body to be polished.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rubber sleeve for polishing used for polishing the surface of an object to be polished having a complex curved surface such as a cathode ray tube panel.

[0002]

2. Description of the Related Art In a cathode ray tube panel, a molten glass block is press-molded with a mold and then polished in a polishing step to finish the outer surface of the panel smooth. In this polishing step, since the shape of the cathode ray tube panel is a horizontally long quadrangular shape and the outer surface is a complex curved surface, it is practically possible to polish this uniformly.
There is a problem that it is difficult.

Therefore, conventionally, as shown in FIG. 2, both ends of a pair of side plates 11 facing each other on a rotary shaft 10 are airtightly fastened and fixed, and a suitable hollow groove is formed on the outer peripheral surface. Air is supplied into the cylindrical body 12 so as to maintain a constant internal pressure to be rotationally driven, and this is pressed against the rotating cathode ray tube panel 13 for polishing under the supply of an abrasive.

A conventional rubber sleeve for polishing has been disclosed in
As disclosed in Japanese Patent Laid-Open No. 5-27518, the shape of the outer peripheral surface in the state in which air is supplied to the inside to keep the inner pressure constant is one that keeps a straight shape in the axial direction. .

[0005]

In the conventional rubber sleeve for polishing, the shape of the outer peripheral surface in the state where air is supplied to the inside to keep the internal pressure constant is considered so as to keep the axial straight. For that reason, it is rather difficult to deform, and it does not fit the complex curved surface of the cathode ray tube panel, for example, the center part of the cathode ray tube panel is best polished, the polishing amount decreases to the peripheral part, and each part is uniform There was a problem that it could not be polished. Further, this causes uneven wear of the polishing rubber sleeve, and when polishing another type of cathode ray tube panel, uniform polishing cannot be performed more and more. In order to prevent uneven wear of the polishing rubber sleeve, conventionally,
Although the axial position of the polishing rubber sleeve is changed regularly or appropriately, it is troublesome and troublesome.

The object of the present invention is to solve the above-mentioned problems of the prior art, improve the adaptability of the object to be polished to the complex curved surface, enable uniform polishing of each part, and prevent uneven wear of the rubber sleeve. The purpose of the present invention is to provide a polishing rubber sleeve that can eliminate axial position adjustment.

[0007]

In order to achieve the above object, according to the present invention, both ends are airtightly fastened and fixed to a pair of side plates arranged opposite to each other on a rotating shaft, and an appropriate groove is formed on an outer peripheral surface. In a rubber sleeve for polishing, in which air is supplied into the rubber hollow cylindrical body to rotate it while maintaining a constant internal pressure, and this is pressed against an object to be polished to polish it under the supply of an abrasive, the rubber hollow cylindrical body When air is supplied to the inside of the 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 the outer diameter becomes maximum at the central portion in the axial direction. It has a shape that elastically deforms and expands.

[0008]

With the polishing rubber sleeve of the present invention, when air is supplied to the inside of the rubber hollow cylindrical body to maintain a constant internal pressure, the outer diameter of the rubber sleeve becomes smaller from the axial ends toward the axial central portion. The shape gradually increases and elastically deforms and expands so that the outer diameter is maximized in the central portion in the axial direction, so that the object to be polished is easily deformed in conformity with the complex curved surface. That is, the rubber hollow cylindrical body constituting the polishing rubber sleeve of the present invention has a central portion which is easily expanded. The fact that the central portion easily expands in this way means that it has a soft property, which means that it is easy to elastically deform when pressed against the object to be polished. Since the rubber sleeve for polishing is easily elastically deformed as described above, when the rubber sleeve is pressed against the compound curved surface of the object to be polished, a region from the central part to the peripheral part of the compound curved surface of the object to be polished, The rubber sleeve flexibly elastically deforms and contacts so as to radially expand the contact area. This improves the adhesion compatibility between the rubber sleeve and the complex curved surface of the object to be polished. As a result of the improved compatibility of the adherend to the compound curved surface of the object to be polished, the compound 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. Therefore, uneven wear of the polishing rubber sleeve is prevented, and position adjustment in the axial direction can be made unnecessary.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a partially cutaway front view showing a use state of a polishing rubber sleeve according to the present invention, in which 1 is a rotary shaft,
Reference numeral 2 is a bearing, 3 is a side plate, 4 is a rubber hollow cylindrical body, 5 is an air supply tube, 6 is a rotary joint, 7 is an object to be polished, which is a Braun tube panel, and 8 is a rotary table. .

Both ends of the rotary shaft 1 are rotatably supported by bearings 2 and are rotationally driven by a drive motor (not shown). Side plates 3 are attached near both ends of the rotary shaft 1, and both ends of a rubber hollow cylindrical body 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, and from the air supply pipe 5, the rotary joint 6 and the rotary shaft 1 are connected.
Air is supplied into the rubber hollow cylindrical body 4 via the air supply passage 1a to keep the internal pressure constant.

On the outer peripheral surface of the rubber hollow cylindrical body 4, an appropriate concave groove 4a for increasing the polishing effect is formed.
FIG. 1 illustrates a case where the corrugated groove is formed so as to be inclined with respect to the axis along 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 central portion in the axial direction. The shape is such that it elastically deforms and expands so that the outer diameter becomes maximum at the central portion in the direction. Therefore, for example, the embedding condition of the reinforcing fiber 4b embedded in the rubber cylindrical body 4 is, in the state before the air is supplied to the inside, over the entire length in the axial direction as shown by a chain line in FIG. When it has a uniform outer diameter and air is supplied to maintain a constant inner pressure, the outer diameter gradually increases from both ends in the axial direction toward the central portion in the axial direction, as shown by the solid line in FIG. At least one of the material and thickness of the reinforcing fiber 4b, the number of yarns per unit area, and the crossing angle of the warp and the weft so that the diameter of the reinforcing fiber 4b increases and expands so as to maximize the outer diameter at the central portion in the axial direction. Is selected and embedded in the rubber hollow cylindrical body 4.

The conditions for embedding the reinforcing fiber 4b are as follows:
For example, when selecting by material, use a thread that is more elastic than before, when selecting by thickness, when using a thread that is thinner than before, and when selecting by the number of threads per unit area, When the number of threads is reduced compared to the conventional method and the selection is made based on the intersecting angle between the warp and the weft, the conventional method is to arrange the warp parallel to the axis and the weft to intersect the warp at a right angle. Alternatively, at least one of them may be selected and embedded in the rubber cylindrical body 4. In addition, the embedding form of the reinforcing fibers 4b is embedding as a coarse cylindrical woven fabric over the entire axial length. In addition to the above-mentioned configuration, the thickened portions 4c are integrally formed on the inner peripheral surfaces of both ends of the rubber cylindrical body 4, and the other portions have a uniform thickness to further enhance 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 the smallest in the central portion in the axial direction and gradually increase toward both ends in the axial direction.

The polishing rubber sleeve of the present invention has the above construction, and its operation will be described below. Both ends of the rubber hollow cylindrical body 4 are airtightly fixed to the side plates 3 at both ends of the rotary shaft 1 via tightening bands 9. Then, air is supplied from the air supply pipe 5 so that a constant internal pressure is always maintained. Thereby, as shown in FIG. 1, the rubber hollow cylindrical body 4 gradually increases in outer diameter from both ends in the axial direction toward the central portion in the axial direction, and the outer diameter becomes maximum at the central portion in the axial direction. Expands like this. However, if the internal pressure is removed, it has a uniform outer diameter over the entire axial length.

The rubber hollow cylindrical body 4 of the present invention is rotationally driven to come into pressure contact with the complex curved surface of the object 7 to be polished shown in FIG. The object to be polished 7 is positioned and held on the rotary table 8 via a jig (not shown), and is rotated by the rotary table 8 during polishing. The object to be polished 7 may be moved linearly in the direction orthogonal to the axial direction of the rubber hollow cylindrical body 4 instead of the rotary table 8 for polishing. In either case, the polishing agent is supplied from the side of the object to be polished 7. The rubber hollow cylindrical body 4 pressed against the workpiece 7 is
The center portion in the axial direction is most easily deformed, and elastically deformed so as to easily fit and fit to the complex curved surface of the object to be polished 7. Even when elastically deformed in this way, the internal pressure is uniformly applied to each part in the rubber hollow cylindrical body 4, so that a uniform polishing pressure is applied to the entire complex curved surface of the object 7 to be polished. Thereby, the object to be polished 7 can be uniformly polished in each part. 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 cylindrical body 4 is set so that the periphery of the side surface of the object to be polished 7 does not have a polishing action when the object to be polished 7 is pressed. Of course, it should not be affected.

[0016]

According to the present invention, when air is supplied to the inside of the polishing rubber sleeve, the rubber sleeve is elastically deformed and expanded so that the central portion has the maximum outer diameter. The flexibility of is increased, and the adhesion adaptability of the object to be polished to the complex curved surface is improved. Moreover, since the internal pressure acting on each part in a state of being elastically deformed flexibly and being closely fitted to the complex curved surface of the object to be polished is uniform, it is possible to uniformly polish the complex curved surface of the object to be polished, As a result, uneven wear of the polishing rubber sleeve is prevented, and position adjustment in the axial direction can be eliminated.

[Brief description of drawings]

FIG. 1 is a partially cutaway 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.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 rotary shaft 2 bearing 3 side plate 4 rubber hollow cylindrical body 4a concave groove 5 air supply pipe 6 rotary joint 7 object to be polished 8 rotary table 9 tightening band

Claims (1)

[Claims] 1. A rubber hollow cylindrical body having both ends airtightly fastened and fixed to a pair of side plates arranged opposite to each other on a rotating shaft, and air is supplied into a rubber hollow cylindrical body to form a constant internal pressure. In a rubber sleeve for polishing, which is held and rotatably driven, and pressed against the object to be polished to polish under the supply of an abrasive, air is supplied to the inside of the hollow rubber cylindrical body to maintain a constant internal pressure. At this time, the outer diameter gradually increases from both ends in the axial direction toward the central portion in the axial direction, and elastically deforms and expands so that the outer diameter becomes maximum at the central portion in the axial direction. Rubber sleeve for.