JPS59232759A - Polishing system - Google Patents

Abstract

PURPOSE:In a polishing system for a convex lens, to achieve an accurate convex face easily by performing working while pressing the work against the inner wall of a cylindrical body to be fed with free abrasive grains. CONSTITUTION:Upon rotation of a rotary roller 29 in the arrow 12 direction, a cylindrical body 11 will rotate in the arrow 13 direction. A work holder 15 sticked with a work 14 is coupled through a rotary shaft 18 and a baseboard 16 with a rotary board 17 which is fixed with a crank shaft 20 through a crank receiver 19 then coupled through an arm 22 with the drive section 21. Consequently, the rotation of the drive section 21 in the arrow 23 direction is transmitted to a holding body 15 to rotate the work 14 around the axis 18. Rotation of cam 24 in the arrow 27 direction is converted into reciprocal motion in the arrow 28 direction by a spring 25 and a coupling rod 26 to reciprocate the baseboard 16 linearly in the axial direction of said body 11. Consequently, the work 14 is polished into convex face having diameter same with that of the inner wall of said body 11 to be fed with free abrasive grains.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a polishing apparatus used for polishing convex spherical lenses and the like.

Structure of a conventional example and its problems A conventional example of a polishing apparatus for obtaining a convex spherical surface using glass or the like is shown in FIG. 1, and a side cross section thereof is shown in FIG. Conventionally, with a convex spherical surface, a plurality of workpiece holders 3 are provided on the main surface of a spherical substrate 1, a workpiece 4 is attached to the workpiece holders 3, and the surface of the polishing pitch or polishing pad 7 is set to the desired workpiece. A polisher 5 attached to the surface with a radius of curvature of This was obtained by rotating the polishing plate rotating shaft 6 in the direction of arrow 9 and swinging the polisher 6 in the direction of arrow 10. However, in this polishing device, it was necessary to finish the inner wall of the polishing dish into a spherical surface, which was extremely difficult to process.

It is necessary to fix the workpieces to the workpiece holder so that the normal direction of each workpiece coincides with the radial direction of the spherical surface of the inner wall of the grinder. Since the workpieces are fixed to a spherical substrate, the normal directions of the workpieces do not coincide with each other, and therefore there is a drawback that variations tend to occur in the direction in which the workpieces are fixed to the substrate.

OBJECTS OF THE INVENTION The present invention aims to solve the above-mentioned conventional drawbacks, and provides a polishing device that can easily obtain a highly accurate convex spherical surface.

Structure of the Invention A polishing apparatus according to the present invention includes a cylindrical body having an opening on one or both end faces, a workpiece holding part, and a workpiece fixed to the workpiece holding part on the wall of the cylinder. means for pressing the cylindrical body, means for reciprocating the cylindrical body about its axis, means for linearly reciprocating the workpiece holder in the axial direction of the cylindrical body, and a drive unit for driving the workpiece holder by a critter. means for communicating with each other to impart rotational motion to the workpiece around the diametrical direction of the cylinder; It is a product that is processed into a spherical surface.

Description of examples Hereinafter, the present invention will be explained with reference to the drawings.

FIG. 3 is a perspective view showing one embodiment of the polishing apparatus according to the present invention.

The cylindrical body 11 is placed on a rotating roller 29, and as the rotating roller 29 rotates in the direction of arrow 12, the cylindrical body 11 rotates in the direction of arrow 13. The workpiece 14 is attached to the workpiece holder 15id, and the holder rotation axis 1
8 sandwiching the base plate 16 and connected to a rotary plate 17, and the rotary plate 17 is provided with a crank receiver 19 at a position at a radius r from its center. A crank arm 20 having holes at positions equal to the center spacing of the workpiece holder 15 is attached to the crank receiver 19, and is connected to the drive unit 21 via an arm 22 having an effective length r. . As a result, the rotational movement of the drive unit 21 in the direction of arrow 23 is transmitted to each workpiece holder 15, and the workpiece 14 rotates about the holder rotation axis 18.

Further, the substrate 16 on which the workpiece holder 15 is provided is such that the rotational movement of the eccentric cam 24 in the direction of the arrow 27 is prevented by the spring 25.
This is converted into a reciprocating motion in the direction of the arrow 28 by the connecting rod 26, resulting in a linear reciprocating motion in the axial direction of the cylindrical body 11.

The workpiece 14 is pressed against the inner wall of the cylinder 11 supplied with free abrasive grains due to the rotational movement of the cylindrical body 11 and the workpiece holder 15 and the reciprocating movement of the substrate 16 of the workpiece holder. The cylindrical body 11 is processed and polished into a convex spherical surface having a radius of curvature equal to the radius of the inner wall of the cylindrical body 11 . Note that the number of revolutions of the cylindrical body 110 per linear reciprocating motion of the substrate 16 provided with the workpiece holder 15 is preferably not an integral multiple since the cylindrical inner wall is uniformly used for processing.

In the above embodiment, free abrasive grains were used as the mold polishing material, but the same effect can be obtained even if the abrasive grains are attached to the inner wall of the cylindrical body.

Effects of the Invention As described above, the spherical polishing apparatus according to the present invention processes a workpiece by pressing it against a cylindrical body, and does not use a conventional spherical polishing plate. Since the cylindrical body can be easily obtained with high precision by lathe processing, it is possible to easily obtain a convex spherical surface with higher precision than with conventional polishing equipment. Furthermore, since the workpieces are aligned and fixed in a straight line, the normal directions of the workpieces are parallel, which has the advantage of increasing the accuracy of attachment to the holding part. Since the workpiece is rotated by a crank mechanism, there is less vibration applied to the workpiece.
Furthermore, the rotational force transmitted to each workpiece is equalized, and convex spherical workpieces with uniform precision can be obtained.

[Brief explanation of the drawing]

Figure 1 is a perspective view showing a conventional example of a spherical polishing device;
FIG. 3 is a side sectional view of the apparatus shown in FIG. 1, and FIG. 3 is a perspective view of the polishing apparatus according to an embodiment of the present invention. 1.16...Substrate, 2...Substrate rotation axis, 3
, 16... workpiece holder, 4, 14...
・Workpiece, 5... Polishing plate, 6... Polishing plate rotating shaft, End... Polishing pitch or polishing pad, 11... Cylindrical body , 17...
...Rotating plate, 18... Holding body rotating shaft, 19...
...Crank holder, 20...Crank arm,
21... Drive unit, 22... Arm, 24
... Eccentric cam, -25 ... Spring, 26
...Connecting rod, 29...Rotating roller. Name of agent Patent attorney Toshio Nakao and one other person Figure 2 A ↓ Figure 3 Otsu "1 ~ ?: 3-J 2B-Otsu

Claims (2)

[Claims] (1) A cylindrical body with an opening on one end surface or both end surfaces, a workpiece holder that holds a workpiece, and an inner wall of the cylindrical body that holds the workpiece held in the workpiece holder. means for pressing the cylindrical body against the cylindrical body, means for rotating the cylindrical body around its axis, means for linearly reciprocating the workpiece holder in the axial direction of the cylindrical body, and a drive unit for driving the workpiece by a crank. a means for connecting the workpiece holding part to provide a rotational movement about the diametrical direction of the cylindrical body, the workpiece is A polishing device that processes the main surface of an object into a spherical surface. (2) The polishing apparatus according to claim 1, comprising a plurality of workpiece holding parts, all of the holding parts being connected to a drive part by a crank, and rotating around the diametrical direction of the cylindrical body. .