JPS59134647A - Polishing method and tool of optical part - Google Patents

Abstract

PURPOSE:To reduce a time and labor required for polishing, by originally molding the pressed material molded to a workpiece by a curve generator and then polishing this workpiece by a polishing tool of solid abrasive grain consisting of plural specific materials. CONSTITUTION:When an optical part of lens or the like is polished, first a workpiece is previously molded to a pressed material in accordance with an objective shape, and originally molded by a curve generator. Next, this originally molded workpiece is polished by a polishing tool of solid abrasive grain consisting of plural specific materials. Here said polishing tool is formed by gluing a block wheel 3 to be attached to the internal surface of a polishing plate 1. Then the block wheel 3 dissolves phenol resin used as a binding agent into an organic solvent, to which a cerium oxide abrasive and a hardening agent are added and uniformly wet mixed, and a produced mixture is fired both removing the organic solvent and being forcibly dried, thus a molded material, after being formed, is placed in a metal mold and manufactured.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for polishing optical parts such as lenses and prisms, and a polishing tool used for the same.

The method of polishing optical parts has undergone two changes due to improvements in 1J11 tools and polishing agents. in general,
The method of polishing this willow involves a rough sanding process in which the pressed fabric is formed into a pre-processed shape, and a sanding process in which the formed workpiece is shaped into the desired shape. It consists of a fine polishing process for mirror polishing (intermediate finishing) and a polishing process for final finishing.

However, in order to reduce the cost of optical '481S products by achieving p<y5 degrees, polishing methods that provide high speed and high quality are being considered one after another. For example, in the rough-sanding process, the shaping method using a curve generator cylinder (CG) has been improved.In other words, the rough-sanding and sanding of the above-mentioned conventional processes are now performed in the same process. .

In addition, in the conventional fine polishing process, polishing was carried out by pasting a pitch agent on the polishing surface, but instead of this, a sheet polishing method using a sheet impregnated with metal powder, resin powder, or diamond powder, So-called precision gellining (pG) was developed, and progress has been made in the polishing process along with mass production. In addition, in the final polishing process, polishing was performed while applying an abrasive to the polished surface, but with the advancement of polishing tools such as the PG mentioned above, the polishing process has become faster, and polishing using water instead of an abrasive has become possible. A method has also been proposed.

In addition, C
A method and conventional sand-kake process are PC that uses both process and fine polishing process.
) method, etc. have been developed, but a processing method that combines a fine polishing process for semi-finishing and a polishing process for final finishing has not yet been developed, and its development is a long-awaited process in this technical field. It was also a temporary request. That is, in addition to the 0G process that combines a rough-sanding process and a sanding process, there is a strong demand for a polishing process that combines a fine-sharpening process and a polishing process to be performed overnight.

The present invention aims to provide a polishing method that satisfies the above-mentioned requirements and a sharpening tool used therefor, which includes a step of undulating and corrugating pressed dough formed on a workpiece material using a curve generator, and an enzyme molding process. A method for polishing optical parts comprising the step of polishing a processed part with a solid abrasive polishing tool made of phenol resin, cerium oxide, and a hardening agent; A polishing tool for optical components is obtained by heating the mixture, drying it under high pressure, crushing it into coarse particles, and then shaping it.

Next, one embodiment of the present invention will be described based on the drawings.

In the conventional polishing method for optical parts shown in Fig. 1, the material to be processed is first formed into a pressed dough according to the desired shape, and then the material is pressed! Cut to a shape close to the desired dimensions, such as the outer diameter and thickness, and use a curve generator (CG
), semi-finishing processing, that is, fine polishing processing using PC, is performed. Next, this processed part is subjected to a final polishing step to obtain a desired processed part.

As shown in FIG. 5, the polishing tool used in the conventional fine polishing process described above uses a diamond so as to form an R portion having the same shape as the polishing surface of the workpiece on the inner peripheral surface of the semicircular polishing surface 1. It is made by pasting a sheet 2 impregnated with powder or metal powder. The workpiece finely polished by this polishing tool is polished for final finishing using a polishing surface 1 having a pitch agent adhered to the inner peripheral surface instead of the sheet 2.

In the conventional polishing method, as described above, it is necessary to perform the polishing process by changing the abrasive agent attached to the inner peripheral surface of the polished surface between the fine polishing step and the polishing step. Furthermore, since some deformation occurs during the polishing process, correction must be made during the process. Furthermore, the pitch agent must be attached to the inner peripheral surface of the polished surface each time the polishing is performed. In this way, the conventional polishing method is
It has the disadvantage of requiring a large amount of time and effort.

Next, the polishing method of the present invention will be explained with reference to FIG. Second
As is clear from the figure, the pressing dough and CG steps are the same as the conventional method shown in FIG. 1, and their explanation will be omitted here. What this invention is completely different from the conventional method is the fine polishing and polishing process, which will be explained below.

The polishing tool used in this fine polishing/polishing step consists of a block whetstone 3 (FIG. 6) adhered to the inner surface of the polishing surface 1 manufactured according to the flow sheet shown in FIG. The block whetstone 3 is produced by first dissolving phenol resin as a binder in an organic solvent, adding a cerium oxide abrasive and a hardening agent to this, and uniformly wet-mixing these. The resulting mixture is aged at 150-170°C to remove the organic bath agent and then forced dried to form a molding material.

As the phenol resin, any type of phenol resin can be used, but it is particularly preferable to use phenol resin, which has the composition and ratio shown below. preferable.

Sulfur oxide (S04・) 1.2% Iron oxide CFe*Os I 0.5% Lanthanum oxide (La20s) 9.0% Cerium oxide
Oz) 86.0% plutonium oxide (Pro
O1t) 0-8% neodymium oxide (,l'
Jdt Os ) 2-5% e-based cerium abrasive, Kashu modified phenol resin, and hardener are mixed in the following mixing ratio: Cerium oxide abrasive 85-95% Kashu modified phenol resin 5-15% Hard oxidizing agent
0.2-0.4% At the above mixing ratio, if the amount of abrasive exceeds the upper limit, the hardness and strength of the resulting grinding wheel will decrease, and if it is less than the lower limit, the durability and friction will decrease. Polishing accuracy decreases due to the impact on polishing properties. On the other hand, if there is too much phenol resin, it will become hard, and if it is too little, it will become soft and lack durability. Regarding this point, L of phenolresin in No. 71d
The relationship between the Simial hardness of the molded block 3 and (%) is shown. From Figure 7, the hardness and softness of block 3 changes due to the flame of phenol resin.1. Therefore, it becomes clear that the appropriate N of the phenol resin and the blending ratio of the abrasive and hardening agent are extremely important.

Next, the p-type material having the above-mentioned compounding ratio is placed in the mold shown in FIG. 4 to manufacture the molded block 3 (FIG. 6a).

In the mold shown in cross section in FIG. 4a, reference numeral 4 denotes a lower mold having a circular protrusion 5 formed in the center corresponding to the dimensions of the molded product. A side wall cylindrical body 6 is mounted above the lower mold 4 and precisely fits the plane of the lower mold 4 and the outer diameter of the protrusion 5.

Furthermore, a T-shaped upper mold 8 having the same size and shape as the lower mold 4 and having a protrusion 7 is fitted and attached above the inner diameter of the side wall cylindrical body 6 2, and a protrusion 5 of the lower mold A and the protrusion 7 of the upper mold 8
A molding material for forming a block is filled between the two.

To manufacture a molded block, first fit and attach the side wall cylinder body 6 onto the lower mold 4, and fill the space between the cylinder bodies on the protrusion 5 with an appropriate amount of molding material obtained according to sheet 70 in Fig. 3. Then, the upper mold 8 is fitted and mounted, and the upper mold 8 is pressed toward the lower mold 4 while heating to 150 to 170°C.After that, the upper mold 8 is separated from the cylindrical body 6, and the cylindrical body is 6 is removed above the lower mold 4, and the produced molded block 3 is removed from the lower mold 4 to obtain it.

One side of the circular molded block 3 obtained in this way is placed into a circular polishing dish with a flat bottom, as shown in FIG.
After fitting the center of the polishing plate 1 into the chuck of a lathe, etc., the other surface of the block 3 is shaped to a desired curvature R.
At the same time, a groove 9 for water supply during polishing (FIG. 6C) is formed, and this is used to carry out the fine polishing-polishing process of the present invention.

Figure 4 is a top view showing another example of a mold used to manufacture a molded block.Generally, when the molded block 3 is removed from the mold, the mold is scratched or dirty. When the molding temperature is high, or when the upper and lower mold temperatures are uneven, etc., the block may not be released from the mold, and it is often necessary to release the block by hitting the mold. In other words, Not only does such mold release work require an extremely large amount of labor, but there is also a risk of damage to the mold or loss of the molded block. When filling the mold, a method is usually used in which a mold release agent is applied to the mold in advance.
In this method, a mold release agent is applied to the upper surface of the projection 5 of the lower mold 4, the inner wall surface of the side wall cylinder 6, and the lower surface of the projection 7 of the upper mold 8, respectively. It may be difficult to release the mold even if a mold release agent is applied. The mold shown in FIG. 4 eliminates the above-mentioned drawbacks and further facilitates mold release.

The mold shown in FIG. 4 has basically the same structure as the mold shown in FIG. 4a except for the use of m-type auxiliary plates 10 and 11. In order to manufacture a molded block using the mold shown in FIG. A mold release agent is applied to the surfaces of these auxiliary plates 10 and 11 that come into contact with the molding material. If it is still difficult to release the mold even if such auxiliary plates 10.11 and a mold release agent are used in combination, a paper pattern is interposed between the upper surface of the auxiliary plate 10 and the lower surface of the auxiliary plate 11, and these If a release agent is applied to the surface of the release paper that comes into contact with the molding material, release can be performed more easily.

Molded block 3 obtained using the mold shown in Figure 4 a or b
By using a material that has been polished as described above, bonded to the tube surface 1, and shaped into any desired shape at the same time, it is possible to polish an optical component of any shape. Furthermore, with the conventional polishing method, there were problems such as the polishing surface of the polishing plate being distorted and having to be corrected, or the polishing plate becoming unusable and having to be regenerated. By shaping the molded block only once, a large number of optical parts can be polished continuously, and it has many effects such as being able to withstand continuous polishing and being suitable for industrial research.

[Brief explanation of drawings]

FIG. 1 is a flow sheet showing the steps of a conventional method for polishing optical components, FIG. 2 is a flow sheet showing the steps of the method of polishing optical components of the present invention, and FIG. 3 is a process for manufacturing a polishing tool used in the present invention. Figures 4a and 4b are diagrammatic cross-sectional views of molds used to manufacture the polishing tool according to the present invention, respectively, and Figure 5 is a diagrammatic diagram of a conventional polishing tool for optical components. A cross-sectional view, FIG. 6, shows the polishing tool of the present invention.
a is a cross-sectional view of the mature block, b is an island r-view of the other M tools, 0
Figure 7 is a plan view of the polishing tool viewed from the side of the molded block, and Figure 7 is a graph showing the relationship between the amount of phenol resin and the hardness of the molded block produced. 4...Lower mold 5.71] Projection 8...Upper mold 9Φ-・Water supply groove 10.11...Mold release liquid aid plate patent Applicant: Olympus Optical Industry Co., Ltd. Figure 1 Figure 2 Figure 3 Figure 4 Figure 6 (C1) (b), (c) Amount of ginseng (h) Procedural amendment (voluntary) 1. Indication of the case 1988 Patent Application No. 6877 Title of the invention 2. Method for polishing optical parts and polishing tools 3. Relationship with the person making the amendment case Patent applicant M”'+W 2-43-2-4, Habagaya, Shibuya-ku, Tokyo
, the agent's description of the detailed description of the invention, Drawing 8, and the contents of the amendments (1) The description from page 2, line 6 to page 4, line 14 of the specification is as follows: Correct. [Hm methods for optical parts are rapidly changing as processing jigs and abrasives are improved. In general, this method of polishing Enoki involves a rough sanding process in which pressed dough that has been previously formed into a processed shape is assembled, a sanding process in which the assembled processed parts are shaped into the desired shape, and a final finishing process. It consists of a polishing process. However, in order to reduce the demand and cost of optical components, high-speed and high-quality polishing methods are being developed one after another. For example, in the rabbit printing process, a distortion method using a curve generator device t (CG) has been developed. In other words, it has become possible to perform rough sanding in a short time in the conventional process mentioned above. In addition, in the process of traditional sand fields, the sand is soaked in water.
Drop the liquid onto the polishing surface and sand! 1J), which was processed using a sink plate.
Instead, a sheet polishing method using a sheet impregnated with metal powder, resin powder, or diamond powder, so-called precision gellining (PG), was developed, and continuous polishing has progressed along with mass production. Also,
In the final polishing process, polishing was performed without applying an abrasive to the polished surface, but with the advancement of polishing tools such as the PG mentioned above, child center processing has become faster, and polishing methods using water instead of abrasive has also been proposed. CG has been developed for the conventional rough-sanding process, and PG has been developed for the sanding process, but a processing method that can be used in combination with the semi-finishing fine polishing process and the final finishing process has not yet been developed. Its development has long been a desire in this technical field. The present invention aims to provide a polishing method that satisfies the above-mentioned requirements and a polishing tool used therein, and includes a step of assembling pressed dough formed into a workpiece material using a curve generator, and It consists of a PG process using abrasive grains impregnated with diamond powder, and a process of polishing the assembled processed parts with a solid abrasive polishing tool made of phenol resin, cerium oxide, and a hardening agent. The present invention provides a method for polishing optical components, and a polishing tool for optical components, which is obtained by heating a mixture of a phenol resin, cerium oxide, and a hardening agent, drying it forcibly, crushing it, and then shaping it. (2) In the figure, correct the deviation of Figure 6C on the attached sheet. 9. List of attached documents (1) Amendment drawings 1 copy Figure 6 (C)

Claims (2)

[Claims] (1) The process of purple-shaping the pressed dough formed on the workpiece material using a curve generator, and the process of turning the raw-formed workpiece into phenol resin, cerium oxide, and an abrasive agent; A method for polishing an optical component, comprising the steps of polishing with a polishing tool. (2) A mixture of phenol resin, cerium oxide, and hardening agent is heated, hardened, and crushed into a polishing tool for optical parts. process and
A step of adding cerium oxide and a hardening agent to this and mixing it uniformly, a step of heating the mixture, a step of force drying the heated mixture, a step of pulverizing the dried mixture, and a step of crushing the mixture. A method for manufacturing an optical component polishing tool 1, characterized by comprising a step of solidifying it with a hot pressure press.