Lens flipping processing jig

Abstract

The utility model discloses a lens overturn processing fixture, including base and support plate, and support plate is rotatablely connected with base through rotating mechanism, the inside integration of support plate has negative pressure gas path system, and negative pressure gas path system includes a plurality of negative pressure adsorption groove, and a plurality of negative pressure adsorption groove evenly distributes in the front of support plate, and the front of support plate is equipped with flexible cushion layer, and flexible cushion layer is used for placing and fixedly waits processing lens, the beneficial effects of the utility model are: the technical scheme of the utility model through the collaborative design of each structure has realized the efficient processing of high accuracy optical lens, and especially is applicable to the precision optical element mass production scene of the position degree requirement rigor.

Description

Technical Field

[0001] This utility model relates to the field of lens processing technology, and in particular to a lens flipping processing fixture. Background Technology

[0002] In the manufacturing process of optical lenses, two key steps are typically required: front-side profile shaping (milling the lens shape according to the design contour) and back-side reference hole machining (used for subsequent assembly positioning). In traditional manufacturing processes, these two steps are completed using two separate fixtures: first, the lens is clamped in the first fixture and the front contour is machined; then, the lens is disassembled and transferred to the second fixture, repositioned, and the back-side reference hole is machined. This process has the following significant drawbacks: the lens needs to be repositioned during the two clamping processes. Due to differences in fixture positioning references and human error, positional deviations of more than 0.05mm can easily occur, directly causing the relative positional accuracy between the reference hole and the profile to exceed tolerances (typically required to be ≤0.02mm), affecting the optical performance of the assembled lens (such as image center offset). The two clamping processes involve fixture replacement, lens disassembly, and recalibration, increasing the auxiliary processing time for a single lens by 30%-50%, leading to a longer production cycle and making it difficult to meet the large-scale mass production requirements of high-precision lenses. The machining accuracy of the reference hole depends on the positioning of the lens contour after cutting. The secondary clamping error will be superimposed on the cutting machining error, resulting in an increased range of positional tolerance fluctuations in batch products (usually > ±0.03mm), reducing the product qualification rate. Traditional fixtures mostly use mechanical clamping to fix the lens, which may cause edge chipping or surface scratches on the lens during clamping. Especially for ultra-thin lenses with a thickness of <1mm, mechanical stress can easily cause lens deformation, further aggravating the loss of machining accuracy.

[0003] To address the aforementioned issues, there is an urgent need to develop a fixture capable of completing double-sided machining in a single clamping operation. By integrating positioning, flipping, and flexible fixing functions, it can fundamentally eliminate secondary clamping errors while improving machining efficiency and product consistency. Utility Model Content

[0004] The main technical problem solved by this utility model is to provide a lens flipping processing fixture, thereby solving one or more of the above-mentioned prior art problems.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a lens flipping processing fixture, including a base and a support plate, the innovation of which is that: the support plate is rotatably connected to the base through a rotating mechanism; the support plate integrates a negative pressure air path system, the negative pressure air path system includes multiple negative pressure adsorption grooves, the multiple negative pressure adsorption grooves are evenly distributed on the front side of the support plate; the front side of the support plate is provided with a flexible pad, the flexible pad is used to place and fix the lens to be processed.

[0006] In some embodiments, the rotating mechanism can rotate the support plate 180° relative to the base to achieve double-sided processing of the lens to be processed.

[0007] In some implementations, the flipping angle error of the rotating mechanism is controlled within ±0.01°.

[0008] In some implementations, the flexible pad is made of corrosion-resistant silicone material and has a thickness of 0.2-0.4 mm.

[0009] In some implementations, the surface of the flexible pad has anti-slip textures.

[0010] In some embodiments, the base is made of high-strength aluminum alloy, and the bottom of the base is provided with a precision positioning groove for quick positioning and locking with the machine tool table.

[0011] In some embodiments, the rotating mechanism includes a high-precision rotating shaft and a servo motor, the servo motor driving the high-precision rotating shaft to rotate the support plate.

[0012] In some embodiments, the number of negative pressure adsorption grooves is at least three, and they are evenly distributed circumferentially along the front side of the support plate.

[0013] The beneficial effects of this utility model are: through the coordinated design of various structures, this technical solution achieves efficient processing of high-precision optical lenses, and is especially suitable for mass production scenarios of precision optical components with strict positional requirements. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0015] Figure 1 This is a schematic diagram of the structure of a lens flipping processing fixture before flipping, according to this utility model.

[0016] Figure 2 This is a schematic diagram of the structure of a lens flipping processing fixture after flipping. Detailed Implementation

[0017] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0018] like Figure 1 and Figure 2 As shown, the present invention includes a lens flipping processing fixture, the specific implementation of which is as follows.

[0019] The base 4 is integrally formed from high-strength aluminum alloy material. Its bottom is machined with a precision positioning groove 3 that matches the four-axis machine tool table. The positioning groove has a "T" shaped cross section, with the groove width accuracy controlled within ±0.005mm and the groove depth 10mm. It is quickly locked to the machine tool table with bolts to ensure that the fixture does not vibrate or shift during processing. The selection of aluminum alloy material takes into account both the structural lightweight and rigidity requirements, which can avoid the lens position deviation caused by fixture deformation during processing.

[0020] The base 4 engages with the positioning pin of the machine tool worktable through the bottom precision positioning groove 3, enabling quick installation of the fixture, and eliminating gaps by coordinating the bolt preload (50 N·m).

[0021] The high rigidity of the high-strength aluminum alloy material ensures no resonance during processing, and the precise design of the positioning groove reduces the fixture change time from the traditional 30 minutes to 5 minutes, improving changeover efficiency.

[0022] The rotating mechanism 1 consists of a high-precision rotating shaft, a servo motor, and a precision turntable. The rotating shaft is made of bearing steel and has a coaxiality error of ≤0.002mm after grinding. The servo motor is a 200W absolute encoder motor, which is used in conjunction with a planetary gear reducer (reduction ratio 10:1) to achieve an angular resolution of 0.001°. The rotating mechanism 1 is fixed to the base 4 by a flange, and the support plate 6 is rigidly connected to the rotating shaft by a keyway to ensure that there is no relative wobbling between the support plate 6 and the rotating shaft during the rotation process.

[0023] The servo motor of the rotating mechanism 1 receives the machine tool signal and drives the rotating shaft to rotate. The angle position is detected in real time by the grating ruler. When it reaches 180°, the brake is triggered to achieve precise positioning.

[0024] The rotating mechanism 1 can achieve an angle error control of ±0.01° to ensure that after the lens is flipped, the positional error between the back machining reference hole and the front cutting contour is ≤0.02mm, thus solving the problem of cumulative error caused by traditional secondary clamping.

[0025] The support plate 6 is made of aerospace-grade aluminum, with an anodized finish on the front to form a hard protective layer; its internal integrated negative pressure air circuit system includes:

[0026] Negative pressure adsorption tank 9: Four arc-shaped grooves are evenly distributed along the circumference of the front side of the support plate 6. The grooves are 5mm wide and 2mm deep, with a groove spacing of 90°. They are connected to the external negative pressure pump (vacuum degree -0.08MPa) through an internal Φ3mm air channel.

[0027] After the negative pressure pump is started, a vacuum is generated in the adsorption tank. The lens is evenly pressed onto the front of the support plate 6 by the slight deformation of the flexible pad 8. The adsorption force can be adjusted within the range of 0.03-0.08MPa by the pressure regulating valve. Advantages: The flexible contact of the silicone pad avoids edge chipping of the lens caused by hard contact. The four symmetrically distributed adsorption tanks ensure uniform force on the lens and prevent deformation of thin lenses (thickness <1mm) during clamping.

[0028] Flexible pad 8: Covers the front of the support plate 6. It is made of corrosion-resistant silicone with a Shore hardness of 60° and a thickness of 0.3mm (which can be adjusted within the range of 0.2-0.4mm according to the curvature of the lens). The surface is pressed with a diamond-shaped anti-slip texture with a depth of 0.1mm, which not only avoids scratching the lens when clamping, but also increases the friction to prevent the lens from sliding when flipping.

[0029] The flexible pad is made of corrosion-resistant silicone material, which is resistant to cutting fluid corrosion. Its 0.3mm thickness ensures sufficient cushioning performance while avoiding loss of adsorption force. The diamond-shaped anti-slip texture increases the friction coefficient between the lens and the pad (static friction coefficient ≥0.8). During the 180° rotation process, there is no slippage of the lens, and the processing qualification rate is increased from 85% with traditional fixtures to 99.5%.

[0030] The rotation angle of the rotating mechanism 1 is controlled by the closed-loop feedback of the grating ruler of the precision turntable, with a positioning error of ≤ ±0.01° and a repeatability of ≤ 0.005°. The rotation action is triggered by the CNC system of the machine tool, and the rotation time from 0° to 180° is ≤ 3 seconds. During the rotation process, the negative pressure adsorption force remains stable (fluctuation ≤ ±0.005MPa).

[0031] The processing flow of this technical solution is as follows:

[0032] Clamping and positioning: Place the lens to be processed on the flexible pad 8, start the negative pressure system, and the four adsorption grooves will generate uniform suction to fix the lens. The positioning time is less than 10 seconds.

[0033] Frontal cutting: The machine tool spindle performs milling according to the contour trajectory recognized by CCD. At this time, the base 4 is rigidly connected to the machine tool through the positioning groove to ensure the stability of the machining.

[0034] Flip-over switching: After the cutting is completed, the rotating mechanism 1 drives the support plate 6 to rotate the lens 180°, and the grating ruler feeds back the positioning completion signal (positioning time < 3 seconds);

[0035] Backside machining: The machine tool switches to the drilling process. Based on the position reference of the front profile, the reference hole is machined, and the hole position accuracy can reach ±0.015mm.

[0036] The advantages of this technical solution are:

[0037] One-time clamping eliminates secondary positioning errors: Compared with the traditional dual-fixture processing solution, it eliminates the lens disassembly and reassembly steps, and improves positional accuracy by 80%.

[0038] High-efficiency processing: The processing time for a single lens has been reduced from the traditional 45 minutes to 25 minutes, increasing production efficiency by 44%;

[0039] Wide compatibility: By replacing the flexible pads 8 with different curvatures, it can be adapted to spherical / aspherical lenses with a curvature of φ10-φ50mm, meeting the needs of multiple scenarios such as mobile phone lenses and automotive lenses;

[0040] Long life design: Key components (such as the shaft and adsorption tank) are made of wear-resistant materials, and the jig maintenance cycle is ≥10,000 processing cycles, reducing the cost of use.

[0041] This implementation achieves efficient processing of high-precision optical lenses through the collaborative design of various structures, and is especially suitable for mass production scenarios of precision optical components with strict positional requirements.

[0042] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made using the content of this utility model specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A lens flipping processing fixture, comprising a base (4) and a support plate (6), characterized in that: The support plate (6) is rotatably connected to the base (4) via a rotating mechanism (1); the support plate (6) integrates a negative pressure air path system, which includes multiple negative pressure adsorption grooves (9) that are evenly distributed on the front side of the support plate (6); a flexible pad (8) is provided on the front side of the support plate (6) for placing and fixing the lens to be processed.

2. The lens flipping processing fixture according to claim 1, characterized in that: The rotating mechanism (1) can drive the support plate (6) to rotate 180° relative to the base (4) to achieve double-sided processing of the lens to be processed.

3. The lens flipping processing fixture according to claim 1, characterized in that: The flipping angle error of the rotating mechanism (1) is controlled within ±0.01°.

4. The lens flipping processing fixture according to claim 1, characterized in that: The flexible pad (8) is made of corrosion-resistant silicone material and has a thickness of 0.2-0.4 mm.

5. A lens flipping processing fixture according to claim 1, characterized in that: The surface of the flexible pad (8) is provided with anti-slip texture.

6. A lens flipping processing fixture according to claim 1, characterized in that: The base (4) is made of high-strength aluminum alloy. The bottom of the base (4) is provided with a precision positioning groove (3), which is used to quickly position and lock with the machine tool table.

7. A lens flipping processing fixture according to claim 1, characterized in that: The rotating mechanism (1) includes a high-precision rotating shaft and a servo motor. The servo motor drives the high-precision rotating shaft to rotate the support plate (6).

8. A lens flipping processing fixture according to claim 1, characterized in that: The number of negative pressure adsorption grooves (9) is at least 3, and they are evenly distributed circumferentially along the front side of the support plate (6).

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