CNC machining method for curved optical lens

Abstract

The invention relates to the technical field of curved-surface optical lens machining, in particular to a curved-surface optical lens CNC machining method.The curved-surface optical lens CNC machining method is based on a jig, the jig comprises an alignment ring and a jig body, and the jig body comprises a machine table machining alignment table, an alignment ring bearing table, an alignment ring positioning circle and a product bearing table; the CNC machining method for the curved-surface optical lens comprises the following steps of optical lens protection, optical lens bonding and CNC machining. The machining efficiency is greatly improved, surface protection and accurate size control of curved-surface products are optimized, a lateral layering mode is adopted, the cutting depth is effectively reduced, the service life of the grinding head is prolonged, multi-piece machining combination is achieved, the production efficiency is improved, the consistency of all pieces of products is guaranteed, and the production cost is reduced. And machining errors and flaws are reduced, and the quality stability of product batches is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of curved optical lens processing, and specifically to a CNC processing method for curved optical lenses. Background Art

[0002] In the modern optical industry, curved optical lenses are widely used in various high-precision devices, such as telescopes, microscopes, laser devices, fiber optic communication systems, and various imaging devices. These curved lenses usually need to have high precision and surface quality to ensure optical performance and working stability. Due to their unique curved shape, the protection and processing accuracy during the production process directly affect the final quality and service life of the product.

[0003] Currently, the production of curved optical lenses mostly adopts numerical control computer (CNC) processing technology. The CNC processing technology is widely used in the production of optical lenses due to its high precision, automation, and flexibility. However, although the CNC processing technology can achieve the processing of curved optical lenses to a certain extent

[0004] With the increasing maturity of artificial intelligence technology and the wide expansion of simulation recognition applications, the application scope of products similar to those described in this patent is also constantly expanding. However, traditional processes usually include: using conventional precision engraving machine technology, designing processing schemes for different surface types according to product characteristics, and multiple loading and unloading and product turning operations. These practices not only make it difficult to ensure the accuracy of the product, but also lead to low product quality and production efficiency. Therefore, the traditional processing technology can no longer meet and support such a wide range of application requirements.

[0005] At the same time, when curved optical lenses are processed by CNC, due to the complexity of their curved surfaces and precision requirements, they are often easily affected by factors such as tools, heat, and pressure during the processing, resulting in a decrease in surface quality or damage. No solutions have been proposed for related technical problems. Summary of the Invention

[0006] Aiming at the problems in the related art, the present invention proposes a CNC processing method for curved optical lenses to overcome the above-mentioned technical problems existing in the existing related technologies. The purpose of the present invention is to greatly improve the processing efficiency, optimize the surface protection of curved products, achieve precise dimension control, adopt a lateral stratification method, effectively reduce the depth of cut, extend the service life of the grinding head, realize multi-piece processing combination, not only improve the production efficiency, but also ensure the consistency between each piece of product, reduce processing errors and defects, and ensure the quality stability of product batches.

[0007] To achieve the above object, the present invention provides the following technical solution: A CNC machining method for a curved optical lens. The CNC machining method for the curved optical lens is based on a jig. This jig includes an alignment ring and a jig body. The jig body includes a machine table machining alignment table, an alignment ring bearing table, an alignment ring positioning circle, and a product wafer stage. The machine table machining alignment table is arranged on one side of the alignment ring bearing table. The alignment ring positioning circle is arranged on the top of the alignment ring bearing table. The product wafer stage is arranged at the center of the top of the alignment ring positioning circle. The alignment ring is arranged on the top of the jig body. An opening is provided at the center of the alignment ring;

[0008] The CNC machining method for the curved optical lens includes the following steps:

[0009] (1) Optical lens protection: Pour optical protective glue and oil thinner into a high-pressure spray gun in proportion for standby. Uniformly spray the concave and convex surfaces of the circular lens respectively to fully achieve a glue layer protection thickness of more than um;

[0010] (2) Optical lens wafer bonding:

[0011] ① Place the jig body and the alignment ring on a microcomputer constant temperature heating platform for pre-baking respectively;

[0012] ② When both the jig body and the alignment ring in step ① reach above ℃, take high-grade paraffin wax and evenly coat the surfaces of the alignment ring bearing table, the alignment ring positioning circle, and the product wafer stage of the jig body;

[0013] ③ Gently place the alignment ring in step ② on the alignment ring bearing table of the jig body;

[0014] ④ Gently place the circular lens in step into the alignment ring and apply force evenly and gently to make the circular lens and the jig come into full and effective contact;

[0015] ⑤ Synchronously move the jig and the circular lens bonded in step ④ out of the heating platform to the waiting cooling area for cooling and standby;

[0016] (3) CNC machining:

[0017] ① Clamping: Place the circular lens bonded and cooled on the five-axis linkage CNC jaws and clamp it;

[0018] ② Positioning: Position the circular lens and use a probe to accurately position the jig;

[0019] ③ Select program for machining: Use a path program for machining;

[0020] ④ Perform arc edge grooving, long edge grooving, convex surface chamfering, and concave surface chamfering on the circular lens in sequence;

[0021] ⑤Following products: Loosen the jaws, remove the jig and the circular lens together, blow off the cutting fluid, place them on the microcomputer constant temperature heating platform. When the bonding wax is fully dissolved, manually remove the circular lens in the vertical upward direction. Wipe clean the alignment ring bearing platform, alignment ring positioning circle and product wafer stage of the jig body for standby.

[0022] Preferably, in step 1, the ratio of the optical protective glue to the oil conditioner is 1:3.

[0023] Preferably, in step 1, the concave and convex surfaces of the circular lens are evenly sprayed for 3 - 5S.

[0024] Preferably, in step 2, the temperature on the microcomputer constant temperature heating platform is set at 100°C.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0026] (1) The present invention is a CNC processing method for curved optical lenses. By completely replacing the traditional multiple flipping processing mode, it can effectively reduce the intermediate pauses and switching times during the processing, ensure the continuity and stability of the processing flow, and greatly improve the processing efficiency on the premise of ensuring quality. This method not only shortens the production cycle but also enhances the overall production capacity, enabling high-demand curved optical products to be processed in a shorter time.

[0027] (2) The present invention is a CNC processing method for curved optical lenses. By adopting spraying protective glue and special jig design, it effectively avoids hard contact during the processing and possible damage to the lens surface. 90% of the area of the jig sinks by 0.03mm, which can ensure that the lens reduces deformation or damage caused by contact during the processing. At the same time, the method of taking the lens uses a vertical upward operation, reducing the influence of friction on the lens surface and ensuring that the surface quality of the lens is not damaged.

[0028] (3) The present invention is a CNC processing method for curved optical lenses. Through precise processing technology, the 3D dimensions of the curved surface products can be controlled within the range of ±0.03mm, the chamfering is controlled within ±0.02mm, and the R angle is controlled within 0.015mm. This technology ensures extremely high requirements for the accuracy of the products, is especially suitable for the processing of high-end optical products, greatly improves the optical performance and assembly accuracy. By optimizing the five-axis linkage CNC path program and adopting a lateral layering method, the cutting depth is effectively reduced, the service life of the grinding head is extended. At the same time, by optimizing the path program, the problem of product chipping is stabilized, the consistency and stability during the processing are improved, and the high quality of the final product is ensured.

[0029] (4) The present invention relates to a CNC machining method for curved optical lenses, which realizes multi-piece machining combination and enables seamless connection between different machining steps through technological innovation. This not only improves production efficiency but also ensures the consistency between each piece of product, reduces machining errors and defects, and ensures the quality stability of product batches. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 FIG. is a schematic structural diagram of the overall fixture of the present invention;

[0031] Figure 2 FIG. is a schematic structural diagram of the fixture body of the present invention;

[0032] Figure 3 FIG. is a schematic top view structural diagram of the fixture of the present invention;

[0033] Figure 4 FIG. is a schematic flow chart of the machining method of the present invention.

[0034] In the reference numerals of the drawings: 1, alignment ring; 101, opening; 2, fixture body; 201, machine table machining alignment table; 202, alignment ring bearing table; 203, alignment ring positioning circle; 204, product supporting sheet table. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention.

[0036] Embodiment

[0037] Please refer to Figures 1-4As shown, the present invention proposes a technical solution for a CNC machining method of a curved optical lens: A CNC machining method of a curved optical lens, the CNC machining method of the curved optical lens is based on a fixture, this fixture includes an alignment ring 1 and a fixture body 2, the fixture body 2 includes a machine tool machining alignment table 201, an alignment ring bearing table 202, an alignment ring positioning circle 203 and a product supporting platform 204, the machine tool machining alignment table 201 is arranged on one side of the alignment ring bearing table 202, the alignment ring positioning circle 203 is arranged on the top of the alignment ring bearing table 202, the product supporting platform 204 is arranged at the center of the top of the alignment ring positioning circle 203, the alignment ring 1 is arranged on the top of the fixture body 2, and an opening 101 is provided at the center of the alignment ring 1; Specifically, both the alignment ring 1 and the fixture body 2 are made of aluminum material; the function of the alignment ring 1 is to pre-fix the product and the product supporting platform 204 coaxially; the machine tool machining alignment table 201 is used for five-axis linkage CNC reference centering; the alignment ring bearing table 202 is used to fix the alignment ring 1 to facilitate product fixing; the alignment ring positioning circle 203 is used to fix the alignment ring 1 to ensure that the product and the product supporting platform 204 are coaxial; the product supporting platform 204 is used to carry the product, and the highlight of this convex platform (90% of the overall area of the convex platform sinks by 0.03 mm and the steps are rounded to reduce the damage that may be caused by the hard contact between the product and the fixture).

[0038] The CNC machining method of the curved optical lens includes the following steps:

[0039] (1) Optical lens protection: Pour the optical protection glue and thinner into a high-pressure spray gun in proportion and wait for use. Spray the concave and convex surfaces of the circular lens evenly to fully achieve a glue layer protection thickness of more than 3 um;

[0040] (2) Optical lens sticking:

[0041] ① Place the fixture body 2 and the alignment ring 1 on a microcomputer constant temperature heating platform for pre-baking respectively;

[0042] ② When both the fixture body 2 and the alignment ring 1 in step ① reach above 100 °C, take high-grade paraffin wax and evenly coat the surfaces of the alignment ring bearing table 202, the alignment ring positioning circle 203 and the product supporting platform 204 of the fixture body 2;

[0043] ③ Gently place the alignment ring 1 in step ② on the alignment ring bearing table 202 of the fixture body 2;

[0044] ④ Gently place the circular lens in step 1 into the alignment ring 1 and apply force evenly and gently to make the circular lens and the fixture come into full and effective contact;

[0045] ⑤ Synchronously move the fixture and the circular lens bonded in step ④ out of the heating platform to the waiting cooling area for cooling and then wait for use;

[0046] (3)CNC Machining:

[0047] ① Clamping: Place the cooled circular lens bonded on the five-axis linkage CNC jaws and clamp it tightly.

[0048] ② Positioning: Position the circular lens and use a probe to accurately position the jig.

[0049] ③ Select Program for Machining: Use the path program for machining; (Spindle speed is 20,000 rpm. For roughing, fine grinding, and edge trimming, use 400# and 600# electroplated grinding heads for grinding respectively, and the program performs lateral layering and feed rate).

[0050] ④ Perform arc edge grooving, long edge grooving, convex edge chamfering, and concave edge chamfering on the circular lens in sequence.

[0051] ⑤ Unload the Product: Loosen the jaws, remove the jig and the circular lens together, blow off the cutting fluid, place them on the microcomputer constant temperature heating platform. When the bonding wax is fully dissolved, manually remove the circular lens vertically upward, and wipe clean the alignment ring bearing platform 202, alignment ring positioning circle 203, and product carrier platform 204 of the jig body 2 for standby.

[0052] Further, in step 1, the ratio of the optical protective glue to the oil conditioner is 1:3.

[0053] Further, in step 1, the convex and concave surfaces of the circular lens are evenly sprayed for 3 - 5S.

[0054] Further, in step 2, the temperature on the microcomputer constant temperature heating platform is set at 100°C.

[0055] The product is a curved surface (convex and concave) and irregular-shaped (non-regular) optical lens (the material is not limited, including but not limited to Ge, Si, K9 white glass equivalent, RG905, ZnS, ZnSe, etc.). Before processing, the product is a circular curved surface (convex and concave); the edge of the product is not a vertical cross-section (with an inclined angle), and the processed steps and edges are all chamfered with different sizes; the R angle of the product steps is controlled within 0.015 mm, the dimensional tolerance is ±0.03 mm, and the chamfer tolerance is ±0.02 mm.

[0056] The present invention combines the special shape of the product and designs an optimal processing jig. The jig can complete the processing of multiple surfaces of the product (shape, steps, chamfers, R angles, edge inclination angles, etc.) at one time. Using a five-axis linkage CNC device, it designs and optimizes the processing path program that conforms to the product, and performs grinding (electroplated grinding head) processing on multiple surfaces of the product at one time, which not only ensures the accuracy and quality of the product but also greatly improves the processing efficiency.

[0057] By completely replacing the traditional multiple flipping processing mode, the present invention can effectively reduce the intermediate pauses and switching times during the processing, ensuring the continuity and stability of the processing flow. On the premise of ensuring quality, the processing efficiency is greatly improved. This method not only shortens the production cycle but also enhances the overall production capacity, enabling high-demand curved optical products to be processed in a shorter time. By using spray protective glue and special fixture design, hard contact during the processing and possible damage to the lens surface are effectively avoided. 90% of the fixture area sinks by 0.03 mm, which can ensure that the lens reduces deformation or damage caused by contact during the processing. At the same time, the method of taking the lens uses a vertical upward operation, reducing the influence of friction on the lens surface and ensuring that the surface quality of the lens is not damaged;

[0058] Through precise processing technology, the 3D dimensions of the curved surface product can be controlled within the range of ±0.03 mm, the chamfer is controlled within ±0.02 mm, and the R angle is controlled within 0.015 mm. This technology ensures the extremely high requirements for the accuracy of the product, is especially suitable for the processing of high-end optical products, greatly improves the optical performance and assembly accuracy. By optimizing the five-axis linkage CNC path program and adopting a lateral layering method, the cutting depth is effectively reduced, and the service life of the grinding head is extended. At the same time, by optimizing the path program, the chipping problem of the product is stabilized, the consistency and stability during the processing are improved, and the high quality of the final product is ensured;

[0059] Multi-piece processing combination is achieved, and through technological innovation, seamless connection between different processing steps is realized. This not only improves the production efficiency but also ensures the consistency between each piece of product, reduces processing errors and defects, and ensures the quality stability of the product batch.

[0060] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inner", "front", "center", "both ends", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0061] In the present invention, unless otherwise clearly specified or limited, terms such as "installation", "setting", "connection", "fixation", "swivel connection" and the like shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. Unless otherwise clearly limited, for those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0062] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A CNC processing method for a curved optical lens, characterized in that: The CNC processing method for a curved optical lens is based on a jig, which comprises an alignment ring (1) and a jig body (2); the jig body (2) comprises a machine processing alignment platform (201), an alignment ring bearing platform (202), an alignment ring positioning circle (203) and a product holding platform (204); the machine processing alignment platform (201) is arranged on one side of the alignment ring bearing platform (202); the alignment ring positioning circle (203) is arranged on the top of the alignment ring bearing platform (202); the product holding platform (204) is arranged at the top center of the alignment ring positioning circle (203); the alignment ring (1) is arranged on the top of the jig body (2); and an opening (101) is opened at the center of the alignment ring (1); The CNC processing method for curved optical lenses comprises the following steps: (1) Optical lens protection: Pour the optical protective glue and oil conditioning agent into a high-pressure spray gun according to the proportion and spray evenly on the concave and convex surfaces of the circular lens to fully achieve a protective glue layer thickness of more than 3um; (2) Optical lens adhesive: ① Place the fixture body (2) and the alignment ring (1) on a microcomputer constant temperature heating platform for pre-baking; ② When the temperature of the fixture body (2) and the alignment ring (1) in step ① reaches above 100° C., high-grade paraffin wax is evenly coated on the surfaces of the alignment ring bearing platform (202), the alignment ring positioning circle (203) and the product wafer support platform (204) of the fixture body (2); ③ Gently place the alignment ring (1) in step ② on the alignment ring bearing platform (202) of the fixture body (2); ④ Gently place the circular lens in step (1) into the alignment ring (1) and apply gentle and even force to ensure that the circular lens and the jig are in full and effective contact; ⑤ Simultaneously move the jig and the circular lens bonded in step ④ out of the heating platform to the cooling area for cooling and standby use; (3) CNC machining: ①Clamping: Place the bonded and cooled round lens on the five-axis linkage CNC clamping jaws; ② Positioning: Position the circular lens and use a probe to accurately position the fixture; ③Select program processing: use path program for processing; ④ The circular lens is sequentially grooved on the arc edge, grooved on the long edge, chamfered on the convex surface and chamfered on the concave surface; ⑤ Unloading the product: Loosen the clamping jaws, remove the jig and the circular lens together, blow off the cutting fluid, place them on a microcomputer constant temperature heating platform, and when the adhesive wax is fully dissolved, manually remove the circular lens in a vertical upward direction, and wipe the alignment ring bearing platform (202), the alignment ring positioning circle (203) and the product wafer support platform (204) of the jig body (2) clean for later use.

2. A CNC processing method for a curved optical lens according to claim 1, characterized in that: In step (1), the ratio of the optical protective adhesive to the oil conditioning agent is 1:

3.

3. The CNC processing method for a curved optical lens according to claim 1, characterized in that: In step (1), the concave and convex surfaces of the circular lens are evenly sprayed for 3-5 seconds.

4. The CNC processing method for a curved optical lens according to claim 1, characterized in that: In step (2), the temperature on the microcomputer constant temperature heating platform is set at 100°C.

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