JPS61121863A - Polishing device - Google Patents

Abstract

PURPOSE:To uniformly polish a workpiece by dividing a lap surface coaxilly around a rotary shaft and rotating said divided surfaces so as to permit relative movement speeds to be made constant. CONSTITUTION:A group 2 of laps supported rotatably on a bearing 1 are adapted to extrapolate coaxial cylindrical alps 2a-2e in order, brought into close contact with each other, and made to be rotatable. And, a lap surface providing a cross sectional shape of a polishing surface is formed on the end surface of said united laps. In addition, pulley parts 4a-4e are respectively formed on the lower ends of the respective cylindrical laps 2a-2e, and belts 7a-7e are trained between said pulleys and a pulley 6 disposed on the driving device 5 for transmitting rotation. With the respective pulleys 4a-4e having diameters being set to provide prescribed relative movement speeds on the lap surface 3, uniform frictional sliding can be assumed at a central portion of the lap surface when a workpiece P such as a rod lens, etc., is driven in a state of the workpiece in contact with the lap surface 3.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a polishing apparatus for molds, mirror bodies, lenses, etc.

(Prior Art) Conventionally, as a wrap for a device for polishing an uneven spherical surface of a lens, etc., as shown in Japanese Patent Publication No. 40-23119 shown in Fig. 6, the wrap is divided into a number of concentric cylindrical pieces, and each piece is separated with its center axis. The surface to be polished is constructed by a collection of a large number of lap pieces a separated and independent along the radial plane, and the surface to be polished is applied to each of the lap pieces a so that the center part of the lap becomes larger than the peripheral part. There are products that have a structure that polishes uniformly, but since they use an elastic body as the pressure structure, it is difficult to adjust the pressure force, and the relationship between pressure and polishing amount cannot be determined, so the polishing accuracy cannot be determined. It had the disadvantage that it could not be improved.

(Objective) In view of the above-mentioned problems, it is an object of the present invention to provide a polishing device that can uniformly and highly accurately polish the center and outer circumference of a spherical or aspherical polished surface of an object to be polished. It is something to do.

(Summary) The polishing device of the present invention is a polishing device of the type that rotates by pressing a lap against an object to be polished. The cylindrical wraps are arranged on the same central axis so that the outer diameter of the inner cylindrical wrap and the inner diameter of the two outer cylindrical wraps rotate closely. The cylindrical wrap is connected to a rotary drive device such as a motor through a rotation transmission device such as an endless belt or a gear, each having a different rotation ratio. The cylindrical wraps are rotated at a higher speed than the laps so that the relative movement speed of each cylindrical lap with respect to the object to be polished is approximately equal.

(Embodiment) Hereinafter, a preferred embodiment of the polishing apparatus of the present invention will be described with reference to the drawings, and FIGS. 1 and 2 show one embodiment.

The wrap group 2 rotatably mounted on the bearing 1 includes a large number of concentric cylindrical wraps centered on the axis C, zat2bt2c, .
2e is sequentially extrapolated, and the cylindrical wrap on the inner diameter side and the cylindrical wrap on the outer diameter side are arranged in close contact with each other so as to be rotatable, and the end face of the wrap group 2 is polished. A continuous lapped surface 3 is formed which has a cross-sectional shape VC (in the illustrated embodiment, it is a concave curved surface). Moreover, each of the above-mentioned cylindrical wraps 2a, 2b.

Pulley parts 4a and 4 are provided at the lower ends of 1 and 2e, respectively.
bt..., 4e are formed, and endless pulleys are formed between these pulley parts and the main drive side pulley 6 which is pivoted on the rotating shaft of the rotational drive device 5 such as a motor arranged in parallel with the shaft center C. 7a, 7b, . . . , 7e are stretched over each other so that rotation is transmitted to each of the cylindrical wraps 2a+2bm, . . ., 2e.

In the polishing apparatus having the above configuration, when the rotary drive device 5 is driven, the driving pulley 6, the endless belts 7a, 7b, . . .

Each cylindrical wrap 2a+2bt..., 2 via 7e
e rotate at different rotational speeds.

By the way, the moving speed (linear speed) L of each of the above cylindrical wraps
is given by L signature r×ω φe−skewer (1), where r is the radius of each cylindrical wrap and ω is the angular velocity. However, the following relationship is established between the radius r and the angular velocity ω of each cylindrical wrap rotated by the drive device 5: ω■-Φ・11 (2)! 5, so change this to the above (
1) When substituted into equation, the moving speed becomes constant.

That is, each of the cylindrical laps 2a, 2b, . When driven in this state, a constant amount of rubbing can be obtained at the center and outer edges.

Therefore, by interposing an abrasive material as necessary between the object R and the lapping surface 30 and slightly rocking the support shaft on the side of the object R, each cylindrical lap 2 a + 2
b+-..., 2e uniformly polish the surface to be polished, and at the same time, do not produce seam marks between the respective cylindrical laps 2a, 2bt..., 2e.

Next, a second embodiment of the present invention will be described with reference to FIGS. 3 and 4.

In this embodiment, each cylindrical wrap 12a of wrap group 12 is
.

The rotation transmission device that connects 12b and 12C is constituted by a gear device. Similar to the first embodiment, the wrap group 12 having the wrap surface 13 at the outer end has concentric cylindrical wraps 12a, 12b, and 12c. They are arranged on the same axis so as to be rotatable with each other, and a rotary shaft 15 is constructed which is connected to the inner end of the wrap 12a at the central axis position and is connected to a rotary drive device f (not shown). Two gears 17a are rotatably supported by a bearing 10a relative to a gear 16a formed on the upper outer periphery of the rotating shaft 15.

The gear 19a formed on the inner periphery of the cylindrical wrap 12b is engaged with the other gear 15bK formed on the lower outer periphery of the rotating shaft 15 through the bearing 10bK.
Therefore, a gear 19b formed on the inner periphery of the two cylindrical knobs 12C via two rotatably supported gears 18a and 18b.
It is made by meshing the two.

In the polishing apparatus, when the rotary drive device is rotated and the lap 12a is rotated through the rotating shaft 15, the cylindrical laps 12b and 12c are connected to the lap 12a through the two gears 17a, 17b, 18a and 18b, respectively. It will turn in the same direction and become 5. Further, this rotational speed is the same as that of the gear 17a.

17b, 18a, and 18b have the same number of teeth Vc.
By configuring, gears 16a, 1 on the rotating shaft 15
6b and gears 19a, 1 of each cylindrical wrap 12b, 12c.
9b, each cylindrical wrap 12a, 1
2b and 12c are 11 each! It becomes 5 to make the relative movement speed with the polishing object equal.

Therefore, as in the first embodiment, uniform polishing of the object to be polished can be achieved.

FIG. 5 shows a third embodiment of the invention.

That is, in this embodiment, as in the second embodiment, %lap group 2
2 concentric cylindrical wraps 22a, 22b.

22C are disposed so as to be rotatable with respect to each other, a rotating shaft 25 is continuously connected to the inner end of the wrap 22a at the central axis position and connected to a rotational drive device (not shown), and this rotation Two gears 27a are rotatably supported by bearings 20a relative to a gear 26a formed on the outer periphery of the shaft 25,
A gear 29a formed on the inner periphery of the cylindrical wrap 22b is meshed with the gear 27b, while the two cylindrical tabs 22b
The gear 26b tc formed on the outer periphery of the bearing 20b
A gear 29b formed on the inner periphery of the cylindrical wrap 12C via two gears 28a and 28b rotatably supported by Vc.
It is constructed by interlocking the two.

According to the above configuration, each cylindrical wrap 22a + 22b
Each cylindrical wrap 22a has a structure in which those adjacent to the inner and outer diameters of *22c are connected to each other by gears.

The rotation ratio of 22b and 22c is also inversely proportional to the radius. That is, when the rotating shaft 25 is rotated, the lapping surface 23 is rotated at a constant moving speed with respect to the object to be polished from the center to the outer diameter. Therefore, similarly to the embodiment described above, the amount of polishing of the object to be polished becomes uniform over the entire polishing surface, so that highly accurate polishing performance can be achieved.

(Effects of the Invention) As described above, according to the present invention, the lapping surface is divided into concentric circles around the rotation axis, and each is rotated so that the relative movement speed is constant. The polishing amount is constant from the center to the outer edge of the surface to be polished, so that uniform polishing can be performed.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway front view of a polishing device showing the g1 embodiment of the present invention, FIG. 2 is a partially cutaway bottom view of the polishing device shown in FIG. 1 above, and FIG. 3 is a longitudinal cross-sectional view of a polishing apparatus showing a second embodiment of the present invention, FIG. 4 is a cross-sectional view taken along line 8-A 1' in FIG. 3, and FIG. 2.12.22・ψ... Cylindrical wrap groups 7a, 7b+
..., 7e ...Endless belt (rotation transmission device) 5
......Rotary drive device 15.25-4.
...Fist/rotating shaft 16a+ 16b117a, 17b+ 18a, 1
sb, 19 a H27ag 27b+28at28
b, 29a...Gear (rotation transmission device) plan 2Z Figure 5 p) S'f) 6Z Procedural amendment (voluntary) February 25, 1985 2, Title of invention Polishing device 3, Amendment Relationship with the case involving a person who does Column 6 of "Description", "Brief Description of Drawings", and "Claims", Contents of Amendment (1) "Wrap" written from the end of the last line of the first page of the specification to the beginning of the first line of the second page was changed to "polisher". (2) "Lap cutting piece a" written in lines 4 and 5 of page 2 is corrected to "polishing plate piece a". (5) Revised "K" for "lap polishing plate" described in the 5th line, the 18th line, and the last line of the same page, respectively. (4) From the end of the first line of the 6th purchase to the beginning of the second line, the word ``rag'' has been corrected to ``polisher.'' (5) Page 3, 2nd line, beginning of 3rd line, beginning of 5th line,
at the end of line 7, middle of line 8, middle of line 9, middle of line 15. In the 16th line, the 18th line, and the 19th line, "lap" is respectively changed to "polisher" K. (6) The word "wrap" written from the end of the third line to the beginning of the fourth line on page 6 is corrected to "polisher." (7) "Wrap" written from the end of line 17 to the beginning of line 18 on page 6 of the same page was changed to "polisher". (8) 4th purchase first bank, 2nd bank, 8th bank, 12th bank
"Wrap" written in the following lines, 14th line, 15th line, and 19th line, respectively, is corrected to ``polishing plate.'' (9) Next to "Ribe" written at the beginning of the 5th line on page 4,
Add "4a+4b+"'4e J. (10) The word "wrap" written from the end of the fourth line to the beginning of the fifth truncation on page 5 has been changed to "polishing plate." (11) "Wrap" written in the 4th line, the beginning of the 7th line, the beginning of the 10th line, the beginning of the 13th line, the 14th line, and the 18th line of the same page, respectively, to the "polishing plate". Change each. (12) The 6th purchase first line, the 2nd line, the end of the 3rd line, the 8th line
"Wrap" written in the following lines, 12th line, 15th line, and 17th line is corrected to ``,'' and ``polishing plate,'' respectively. (13) The word "continuous" in line 5 on page 6 of the same document was changed to "concatenation." (14) "Wrap" listed in the 7th purchase first line, 2nd line, 10th line, 12th line, 16th line, 18th line, and last line, respectively, is replaced with ``polishing''. ``Plate'' K corrects each. (15) From the end of line 9 to the beginning of line 10 on page 7, the word ``lamp'' has been changed to ``polishing plate.'' (16) "Wrap" described in the third, fifth, seventh and 14th lines of page 8 has been changed to "polishing plate". (17) “Wrap” described in page 9, line 15 of the same,
Changed to "polishing plate". (18) “Claims” stated on page 1 of the specification,
Revised as per attached sheet. Attachment ``2. Claims In a polishing device that polishes an object to be polished by pressing a polishing plate against the object to be polished and rotating it,

Claims (1)

[Claims] In a polishing device that polishes an object by pressing a lap against the object and rotating it, the lap is formed by a group of many concentric cylindrical laps, and the inner cylindrical lap is Arranged so that the outer periphery and the inner periphery of the outer cylindrical wrap are in close contact with each other and are rotatable,
Each of the cylindrical wraps is connected to a rotation drive device via a rotation transmission device, and each of the cylindrical wraps is rotated so that the relative movement speed of each of the cylindrical wraps with respect to the object to be polished is approximately uniform. A polishing device featuring: