CN115365896A

CN115365896A - Processing technology of high-precision optical lens and product thereof

Info

Publication number: CN115365896A
Application number: CN202210633494.1A
Authority: CN
Inventors: 陈琪
Original assignee: Suzhou Qiming Glass Instrument Co ltd
Current assignee: Suzhou Qiming Glass Instrument Co ltd
Priority date: 2022-06-07
Filing date: 2022-06-07
Publication date: 2022-11-22

Abstract

The invention discloses a processing technology of a high-precision optical lens, which comprises the steps of polishing an optical lens blank by using a classical polishing method after emery sanding the optical lens blank, and finally edging and detecting to obtain a qualified optical lens. And the adhesive of specific composition chooses for use and makes the product have excellent temperature toleration in the course of working in the dull polish in-process, can weaken the denaturation influence of high temperature to optical lens piece powerfully, with operation synergism such as selection of polishing film, the polishing solution of specific composition in the polishing process, optical lens's face type precision has further been increased, and used material all does not have corrosivity, the polishing solution is little with the reactivity of processing lens piece, the damage of lens piece has been avoided, dull polish, the quality and the efficiency of polishing have been improved.

Description

Processing technology of high-precision optical lens and product thereof

Technical Field

The invention relates to the technical field of optical lens processing, B24B13/00, in particular to a processing technology of a high-precision optical lens and a product thereof.

Background

In the development history of optical processing, the process from classical polishing to high-speed polishing is performed, and meanwhile, processing equipment, auxiliary materials and processes are changed greatly. The classical polishing, which is actually a 'low-speed bulk material and high-tech', has a processing precision of 20-one wavelength or even higher, and a surface roughness of 0.0004-0.001 μm, but has a low processing efficiency and depends on long-term experience accumulation of processing personnel. The high-speed polishing is realized by modern processing equipment, a precise tool grinding tool and a flow process, can realize large-batch and high-speed optical element production, is more dependent on excellent preparation and process design, and has lower integral performance of precision and roughness than classical polishing. Therefore, according to different product requirements, a proper processing technology can be selected.

CN201610229936.0 discloses a cold processing technique for high-precision optical lens, which comprises precisely grinding a workpiece with diamond pellet in a flat-pendulum high-speed refiner, pre-polishing with high-speed flat pendulum, and precisely polishing with a plain polisher. Patent CN201910685391.8 provides a process for polishing a tiny lens based on polyurethane on a twenty-axis device, and a polyurethane sheet is adopted to replace white glue and black glue, so that the polishing time is shortened, the stability of an aperture is good in the polishing process, the service life is long, but the smoothness of the obtained lens is poor.

Disclosure of Invention

In order to solve the above problems, a first aspect of the present invention provides a process for processing a high-precision optical lens, including the steps of:

(1) Sanding: and (3) grinding the optical lens blank by a lens grinder at normal temperature through adding carborundum into the optical lens blank through a die, and fixing the R value to reach the required central thickness of the lens.

(2) Polishing: and (3) grinding the frosted sample obtained in the step (1) by a four-axis polishing machine through a polishing film and polishing powder on an optical lens until the surface of the lens is polished to be bright and has no scratches.

In some preferred embodiments, the specific operation of sanding in (1) includes the following steps:

s1, heating an adhesive, and bonding the adhesive with an optical lens blank;

s2, heating the glue iron grinding tool, bonding the heated glue iron grinding tool with the glued surface of the optical lens blank obtained in the S1, and placing the optical lens blank on a rotating shaft of a lens grinding machine;

and S3, adding deionized water and carborundum into the iron grinding tool, adjusting the swing amplitude, rotating, grinding, and then washing with clean water.

In some preferred embodiments, the optical lens blank in S1 is not particularly limited, and may be purchased directly, for example, from danyang.

In some preferred embodiments, the composition of the binder in S1 at least includes at least one of asphalt, rosin, acrylic resin, calcium carbonate, magnesium sulfate, paraffin wax, beeswax, and coumarone resin; preferably, the composition of the adhesive in S1 comprises asphalt, rosin, calcium carbonate and paraffin.

In some preferred embodiments, the softening point of the rosin is 50-85 ℃, the acid value is 135-175 mgKOH/g, and the mass percentage of the saponified substance is 0.2-0.8%; preferably, the softening point of the rosin is 65-75 ℃, the acid value is 145-165 mgKOH/g, and the mass percentage content of the saponified substance is 0.5%.

In some preferred embodiments, the paraffin wax is selected from at least one of a crude paraffin wax, a semi-refined paraffin wax, a fully refined paraffin wax; preferably, the paraffin wax is a semi-refined paraffin wax.

In some preferred embodiments, the semi-refined paraffin wax has a melting point of 50 to 65 ℃, an oil content of 1 to 3%, and a color number of 15 to 20; preferably, the semi-refined paraffin has a melting point of 58-60 ℃, an oil content of 1.8% and a color number of 17.

In some preferred embodiments, the calcium carbonate has a Mohs hardness of 2 to 5, an average particle size of 5 to 300nm, and an oil absorption of 50 to 60mL/100g; preferably, the calcium carbonate has a Mohs hardness of 3, an average particle size of 10 to 100nm, and an oil absorption of 53mL/100g.

The adhesive in the present application is used to bond the optical lens blank to the plastic and then to fix the optical lens blank to the grinding machine, and therefore, it is required to have excellent adhesive properties. When the adhesive comprises asphalt, rosin and paraffin, the adhesive has strong adhesive force, particularly when the paraffin is semi-refined paraffin, the softening point of the rosin is 65-75 ℃, the acid value is 145-165 mgKOH/g, and the mass percentage of the saponified substance is 0.5%, the obtained adhesive composition also has proper softening temperature, the internal stress after bonding is small, and the bonding strength is further enhanced. However, the lens is denatured due to the increase of temperature during the frosting process, and the processing precision is reduced. The applicant finds that the addition of calcium carbonate in the system is beneficial to improving the influence of temperature on the processability of the optical lens, and probably because the calcium carbonate has a higher pH value, can provide more groups, promotes the formation of hydrogen bonds in more systems, increases the crosslinking degree of the systems, increases the fixing effect on the optical lens, has a higher oil absorption value, can increase the infiltration dispersity of the calcium carbonate in the systems, adjusts the viscosity and elasticity of the polishing solution, plays a better reinforcing role, further enhances the temperature resistance of the polishing solution, and improves the processing precision of the optical lens.

The applicant has surprisingly found that when the particle size of calcium carbonate is 10 to 100nm, the dispersibility is good and the surface roughness of the optical lens can be further reduced. When the particle size is too large, the thixotropic property of the adhesive is reduced, and the adhesive is easy to sag, and when the particle size is too small, the agglomeration phenomenon is easy to occur, the dispersibility is reduced, the roughness of the surface of the adhesive is increased, and further, the surface roughness of the optical lens is increased, and the smoothness is reduced.

In some preferred embodiments, the mass ratio of the asphalt, the rosin, the calcium carbonate and the paraffin is 1: (10-15): (9-10): (0.1 to 0.5); preferably, the mass ratio of the asphalt, the rosin, the calcium carbonate and the paraffin is 1:13:9.6:0.28.

in some preferred embodiments, the diamond grains are selected from at least one of coarse diamond grains, fine diamond grains; preferably, the carborundum is coarse carborundum and fine carborundum.

Preferably, in S3, the diamond grains are subjected to a coarse diamond sand sanding process and then to a fine diamond sand sanding process.

In some preferred embodiments, the coarse emery is 15-30 #, and the sanding time is 7-20 min; preferably, the number of the coarse emery is 18-23, and the grinding time is 10-15 min; further preferably, the coarse emery is 20#, and the sanding time is 14min.

In some preferred embodiments, the fine carborundum is 5-12 #, and the sanding time is 6-15 min; preferably, the carborundum is 5-9 # and the polishing time is 8-10 min; further preferably, the fine emery is 7#, and the sanding time is 9min.

In some preferred embodiments, the specific operations of polishing in (2) are: and (3) sticking the polishing film into an iron mold, adding polishing liquid, and rotationally polishing the frosted optical lens through a four-axis polishing machine until the surface of the lens is polished to be bright and has no scratches.

In some preferred embodiments, the method of polishing is selected from one of high speed polishing, classical polishing; preferably, the method of polishing is classical polishing.

In some preferred embodiments, the raw material of the polishing film includes at least one of pitch, rosin, microcrystalline wax, paraffin wax, insect wax, coumarone resin, acrylic resin, and urethane resin; preferably, the raw materials of the polishing film are asphalt, rosin and paraffin.

In some preferred embodiments, the mass ratio of the asphalt, the rosin and the paraffin is 1: (0.5-2): (0.1-0.3).

Preferably, when the outdoor temperature is 18-38 ℃, the mass ratio of the asphalt, the rosin and the paraffin is 1:1.5:0.2.

preferably, when the outdoor temperature is-20 to 18 ℃, the mass ratio of the asphalt, the rosin and the paraffin is 1:0.9:0.15.

in some preferred embodiments, the polishing solution is an aqueous solution of polishing powder; preferably, the concentration of the polishing solution is 20-30%; further preferably, the concentration of the polishing liquid is 25%.

In some preferred embodiments, the polishing solution needs to be continuously supplemented according to the concentration of the polishing solution in the polishing process, and the supplementing manner is to uniformly spread the polishing solution on the surface of the lens through a writing brush.

In some preferred embodiments, the polishing powder is selected from at least one of chromium oxide, white corundum, rare earth series polishing powder, zirconium carbonate, aluminum chloride, zinc nitrate, silicon dioxide, zinc sulfate; preferably, the polishing powder is a rare earth series polishing powder.

In some preferred embodiments, the rare earth series polishing powder is selected from at least one of lanthanum oxide, lanthanum chloride, cerium oxide, cerium nitrate, cerium carbonate, ammonium cerium nitrate, cerium acetate, neodymium oxide, neodymium nitrate, zirconium oxide, gallium oxide; preferably, the rare earth series polishing powder is cerium oxide.

In some preferred embodiments, the cerium oxide has a particle size in the range of 0.5 to 5 μm and a hardness of 5 to 10; preferably, the cerium oxide has a particle size ranging from 1.1 to 3.0 μm and a hardness ranging from 6 to 9.

In some preferred embodiments, the rotation speed of the rotary polishing is 120-200 r/min, and the time of the rotary polishing is 135-160 min; preferably, the rotating speed of the rotary polishing is 160r/min, and the time of the rotary polishing is 150min.

(3) Edging: and (3) carrying out centering grinding on the optical lens obtained after the treatment in the step (2) by using a full-automatic edge grinding machine through circulating cooling liquid at normal temperature until the required outer diameter size is obtained.

(4) And (4) checking: wiping the optical lens obtained after the treatment in the step (3) with wiping liquid at normal temperature, then checking with an interferometer, packaging with a carton after the inspection is qualified, and then delivering.

The second surface of the present invention provides a high-precision optical lens obtained by the above-described processing.

Compared with the prior art, the invention has the following beneficial effects:

(1) In the application, after carborundum sanding is carried out on an optical lens blank, the optical lens blank is polished by a classical polishing method, and finally edge grinding and detection are carried out, so that a qualified optical lens can be obtained.

(2) The selection of the adhesive of specific constitution makes the product have excellent temperature toleration in the course of working in the dull polish in-process in this application, can weaken high temperature to optical lens's degeneration influence by force, with polishing film, the operation synergism such as selection of polishing solution of specific constitution in the polishing process, optical lens's face type precision has further been increased, and used material all does not have corrosivity, the polishing solution is little with the reactivity of processing lens, the damage of lens has been avoided, the quality and the efficiency of dull polish, the polishing have been improved.

(3) The product obtained by the processing technology of the optical lens in the application is fine and smooth, has good smoothness and low surface roughness, and the yield reaches 100%.

Detailed Description

Example 1

Example 1:

1. a processing technology of a high-precision optical lens comprises the following steps:

(1) Sanding: and (3) grinding the optical lens blank by a lens grinder at normal temperature through adding carborundum into the optical lens blank through a die until the size meets the requirement and the required central thickness of the optical lens is reached.

(2) Polishing: and (2) grinding the frosted sample obtained in the step (1) by a four-axis polishing machine through a polishing film and polishing powder on an optical lens until the surface of the lens is polished to be bright and has no scratches.

The specific operation of sanding in the step (1) comprises the following steps:

s1, heating an adhesive, and bonding the adhesive with an optical lens blank;

The optical lens blank in S1 was purchased from danyang.

The adhesive in the S1 comprises asphalt, rosin, calcium carbonate and paraffin.

The CAS number of the asphalt is 8052-42-4.

The softening point of the rosin is 65-75 ℃, the acid value is 145-165 mgKOH/g, and the mass percentage of the saponified substance is 0.5% (purchased from Jitian chemical Co., ltd., shenzhen).

The paraffin is semi-refined paraffin.

The semi-refined paraffin has a melting point of 58-60 ℃, an oil content of 1.8% and a chroma of No. 17 (purchased from Condits chemical engineering (Hubei) Co., ltd., no. 58# semi-refined paraffin).

The Mohs hardness of the calcium carbonate is 3, the average particle size is 10-100 nm, and the oil absorption value is 53mL/100g (purchased from Shanghai Jiang chemical Co., ltd.).

The mass ratio of the asphalt, the rosin, the calcium carbonate and the paraffin is 1:13:9.6:0.28.

the carborundum is coarse emery and fine carborundum.

In S3, the steel wire is subjected to sanding treatment by coarse emery and then to sanding treatment by fine emery.

The coarse emery is No. 20, and the grinding time is 14min (purchased from Macro-abrasive Limited, salt City).

The fine emery is No. 7, and the grinding time is 9min (purchased from Macro-force grinding materials, inc. in Yancheng).

The specific operations of polishing in the step (2) are as follows: and sticking the polishing film into an iron mold, adding polishing liquid to polish at normal temperature, and rotationally polishing the frosted optical lens by a four-axis polishing machine until the surface of the lens is polished to be bright and has no scratches.

The polishing method is classical polishing.

The polishing film is prepared from the raw materials of asphalt, rosin and paraffin.

The outdoor temperature is 30 ℃, and the mass ratio of the asphalt, the rosin and the paraffin is 1:1.5:0.2.

the polishing solution is an aqueous solution of polishing powder; the concentration of the polishing solution is 25%.

The polishing solution needs to be continuously supplemented according to the concentration of the polishing solution in the polishing process, and the supplementing mode is that the polishing solution is uniformly scattered on the surface of the lens through a writing brush.

The polishing powder is rare earth polishing powder.

The rare earth series polishing powder is cerium oxide.

The particle size range of the cerium oxide is 1.1-3.0 mu m, and the hardness is 6-9 (purchased from Shijiazhuang Ningpo New Material science and technology Co., ltd.).

The rotating speed of the rotary polishing is 160r/min, and the time of the rotary polishing is 150min.

The circulating cooling liquid is soluble oil and water; the volume ratio of the soluble oil to the water is 1:15; soluble oils were purchased from the lean lubricating oil trade company, suzhou.

The wiping solution is absolute ethyl alcohol and is purchased from Suzhou city Chinese chemical industry materials Co.

2. A high-precision optical lens is obtained by the processing technology.

Example 2:

1. the processing technology of the high-precision optical lens is different from that of the embodiment 1 in that:

the outdoor temperature is 10 ℃, and the mass ratio of the asphalt, the rosin and the paraffin is 1:0.9:0.15.

2. an optical lens prepared by the above method.

Comparative example 1:

the mass ratio of the asphalt, the rosin and the paraffin is 1:2.5:0.2.

2. an optical lens prepared by the method.

Comparative example 2:

the paraffin is fully refined paraffin.

The melting point of the semi-refined paraffin is 58-60 ℃, the oil content is less than or equal to 1.5%, and the color (white) is more than or equal to 17.79 (Heizhou division, 60# fully refined paraffin, china Guangdong, hainan Union energy Co., ltd.).

2. A high-precision optical lens is prepared by the method.

Comparative example 3:

the mass ratio of the asphalt, the rosin, the calcium carbonate and the paraffin is 1:7:9.6:0.28.

2. a high-precision optical lens is prepared by the method.

And (3) performance testing:

1. surface type precision: the lenses obtained in the examples and comparative examples were measured for their PV value (peak-to-valley value) and RMS value (mean square deviation of total area) according to the national standard GB/T2831-2009.

2. Surface roughness: the lenses obtained in the examples and comparative examples were tested according to the national standard GB/T1031-2009.

TABLE 1 results of the Performance test of examples and comparative examples

Claims

1. A processing technology of a high-precision optical lens is characterized by comprising the following steps:

(1) Sanding: grinding an optical lens blank by a lens grinding machine at normal temperature through adding carborundum into a die, fixing the R value and achieving the central thickness required by the lens;

(2) Polishing: grinding the frosted sample obtained in the step (1) by a four-axis polishing machine through a polishing film and polishing powder on an optical lens until the surface of the lens is polished to be bright and has no scratch;

(3) Edging: at normal temperature, the optical lens obtained after the treatment in the step (2) is centered and ground by a full-automatic edge grinding machine through circulating cooling liquid until the required outer diameter size is obtained;

2. A process for manufacturing a high precision optical lens according to claim 1, wherein the specific operation of frosting in (1) comprises the following steps:

s1, heating an adhesive, and then bonding the adhesive with an optical lens blank;

3. A process for manufacturing a high-precision optical lens according to claim 2, wherein the composition of the binder in S1 at least comprises at least one of asphalt, rosin, acrylic resin, calcium carbonate, magnesium sulfate, paraffin wax, beeswax, and coumarone resin.

4. A process for manufacturing a high precision optical lens as claimed in claim 1, wherein the composition of said adhesive in S1 comprises pitch, rosin, calcium carbonate, paraffin;

the mass ratio of the asphalt, the rosin, the calcium carbonate and the paraffin is 1: (10-15): (9-10): (0.1-0.5).

5. A process for manufacturing a high-precision optical lens according to claim 3 or 4, wherein the softening point of the rosin is 50 to 85 ℃, the acid value is 135 to 175mgKOH/g, and the mass percentage of the saponified substance is 0.2 to 0.8%;

the paraffin is at least one selected from crude paraffin, semi-refined paraffin and fully refined paraffin;

the Mohs hardness of the calcium carbonate is 2-5, the average particle size is 5-300 nm, and the oil absorption value is 50-60 mL/100g.

6. A process for manufacturing a high-precision optical lens according to claim 2, wherein said diamond grains are at least one selected from the group consisting of coarse diamond grains and fine diamond grains;

the number of the coarse diamond sand is 15-30, and the polishing time is 7-20 min;

the number of the fine carborundum is 5-12, and the polishing time is 6-15 min.

7. A high precision optical lens processing technology as claimed in claim 1, wherein the polishing in (2) is specifically performed by: sticking the polishing film into an iron mold, adding polishing liquid, and rotationally polishing the frosted optical lens by a four-axis polishing machine until the surface of the lens is polished to be bright and has no scratch;

the polishing method is selected from one of high-speed polishing and classical polishing.

8. A high precision optical lens processing technology as claimed in claim 7, wherein said polishing method is classical polishing.

9. A process for manufacturing a high-precision optical lens, according to claim 1 or 7, wherein said polishing film comprises at least one of asphalt, rosin, microcrystalline wax, paraffin wax, insect wax, coumarone resin, acrylic resin, and urethane resin.

10. A high precision optical lens, characterized in that it is obtained by a process according to any one of claims 1 to 9.