A ball cover polishing clamping fixture

Abstract

The utility model discloses a kind of ball cover polishing clamping fixtures, belong to ball cover polishing processing tool field, the fixture mainly includes pressure base, base pedestal, O-shaped sealing ring, object and gas guide passage.It is connected with equipment main shaft through pressure base, using the principle that O-shaped sealing ring set in pressure base clamping groove forms negative pressure after pressure exhaust rebound, ball cover is stably adsorbed on concave or convex object, realize the non-adhesive fixing of ball cover.Effective solution the stress uneven and thermal deformation problem caused by traditional bonding mode, with clamping speed fast, coaxial degree high, many advantages such as applicable specification, can significantly improve the surface shape precision and surface quality of ball cover polishing.

Description

Technical Field

[0001] This utility model relates to the field of ball cover polishing tools, specifically to a ball cover polishing clamping fixture. Background Technology

[0002] Traditional optical dome polishing and mounting process involves manually attaching the dome to the mounting plate with sealing wax or tar, or using a non-separable integrated clamp. The dome is then glued together using a mold, sealing wax or tar, or the main lens is clamped in place using a non-separable integrated clamp. The coaxiality of the multiple clamps is used to ensure the center deviation or thickness difference of the lens.

[0003] Currently, some dome covers with radii of curvature approaching hemispheres have arc heights close to the radius of the lens. Polishing fixtures for these dome covers, which are nearly hemispherical, often suffer from variations in coaxiality and end runout due to thermal changes or uneven stress, when using traditional methods (sealing wax or tar bonding) or integrated fixtures. This makes the clamping operation cumbersome and inefficient, and the use of large amounts of tar and sealing wax bonding also increases costs excessively. Furthermore, during the mounting process, it is difficult to control the coaxiality and end runout of the dome cover, making it difficult to guarantee the coaxiality and end runout accuracy between the dome cover and the equipment spindle. Utility Model Content

[0004] To address the problems existing in the background technology, this utility model proposes a ball cover polishing clamping fixture, which uses a concave or convex surface carrier for adsorption and mounting of the ball cover, which can improve clamping efficiency and make it easier to control the coaxiality of the ball cover and reduce end runout.

[0005] The ball cover polishing clamping fixture of this utility model includes a pressure base, which is installed on the main shaft of the polishing equipment and has a hollow cavity inside. The side wall of the hollow cavity is provided with a slot. O-rings, which are fitted into slots, are made of elastic material and are used to release air when compressed and to create negative pressure when they rebound. The base is located inside the hollow cavity of the pressure base and contacts the O-ring; A carrier, mounted on a base, is used to support the polishing ball cover. The carrier includes a concave carrier and a convex carrier. The air guide channel connects the main shaft, pressure base, base plate, and the load.

[0006] The concave and convex carriers are available in various specifications.

[0007] The concave carrier is fixed to the base of the substrate by a threaded connection, and its concave shape matches the concave surface of the ball cover to be polished.

[0008] The convex surface carrier is directly installed in the hollow cavity of the pressure base, its outer wall is in contact with the O-ring, and it is provided with a concave surface structure that is adapted to the convex surface of the spherical cover.

[0009] The bottom end face of the convex carrier is also provided with a fixing ring for limiting and assisting in supporting the spherical cover.

[0010] The base and the convex carrier are provided with limiting structures for restricting the radial displacement of the O-ring, including stepped structures or groove structures.

[0011] The O-ring is an inflatable annular sealing ring or a solid elastomer ring.

[0012] The beneficial effects of this utility model are: Compared with existing technologies, this utility model provides a concave or convex support for adsorbing and mounting the spherical cover. During installation, ensuring the end face of the spherical cover is flush with the end face of the concave or convex support ensures the coaxiality of the spherical cover and the support. Furthermore, compared to using sealing wax or tar to bond the support, it improves clamping efficiency and reduces end runout. In addition, both the concave and convex support are available in several specifications, allowing selection of the appropriate support based on the size of the spherical cover, thus enabling clamping and supporting spherical covers of different diameters and radii. Attached Figure Description

[0013] Figure 1 This is an exploded perspective view of the fixture in Example 1; Figure 2 This is a cross-sectional view of the fixture used in Example 1; Figure 3 This is a cross-sectional view of the fixture used in Example 2.

[0014] Explanation of reference numerals in the attached drawings: 1. Spindle; 2. Pressure base; 21. Slot; 3. O-ring; 4. Base; 41. Step structure; 5. Concave surface carrier; 6. Ball cover; 7. Air guide channel; 8. Convex surface carrier; 81. Groove structure; 9. Fixed pressure ring. Detailed Implementation

[0015] To make the objectives, technical solutions, and beneficial effects of this utility model clearer, the preferred embodiments of this utility model will be described in detail below with reference to the accompanying drawings, so as to facilitate understanding by those skilled in the art.

[0016] Example 1 This embodiment provides a spherical cover polishing clamping fixture for rapid and highly coaxial clamping of the optical spherical cover 6 during the polishing process. This fixture fixes the spherical cover 6 using the principle of negative pressure adsorption, effectively avoiding the stress unevenness and thermal deformation problems caused by traditional bonding methods, and is suitable for high-precision spherical surface polishing.

[0017] See Figure 1 and Figure 2 The fixture as a whole includes a pressure base 2, a base 4, an O-ring 3, a carrier, and an air guide channel 7 that runs through multiple components. The pressure base 2 is connected to the main shaft 1 of the polishing equipment by threads, and has a hollow cavity inside to accommodate the base 4. An annular groove 21 is machined on the side wall of the hollow cavity, and the O-ring 3 is assembled in the groove 21. The O-ring is made of elastic material and can expel air when pressure is applied and rebound after the pressure is released, thereby forming a negative pressure adsorption. The carrier is divided into two types according to the curved surface type of the ball cover 6 to be polished: a concave carrier 5 and a convex carrier 8, and each is designed with various specifications to accommodate ball covers of different sizes.

[0018] The base 4 contacts the O-ring 3, which can be an inflatable annular seal or a solid elastomer (such as a rubber ring). The concave carrier 5 is threadedly fastened to the bottom of the base 4, and its concave shape matches the concave surface of the ball cover 6 to be polished.

[0019] The spindle 1, pressure base 2, base 4, and concave carrier 5 are all equipped with interconnected air channels 7, with a detachable check valve at the outer end of each channel. During clamping, the concave surface of the ball cover 6 is attached to the concave carrier 5, and axial pressure is applied to lower the base 4, compressing the O-ring 3 and allowing the internal gas to escape through the air channel 7. After releasing the pressure, the O-ring 3 rebounds, creating a negative pressure that stably adheres the ball cover 6 to the carrier. Then, a polishing mold is used to hold it in place for convex surface polishing. After polishing, the check valve is removed, and compressed air is introduced to release the adhesion, allowing the ball cover 6 to be removed.

[0020] Example 2 like Figure 3 As shown, in another embodiment, the convex carrier 8 is directly installed in the hollow cavity of the pressure base 2, with its outer wall in contact with the O-ring 3. The convex carrier 8 is equipped with a fixing pressure ring 9 for limiting and providing auxiliary support to the spherical cover 6. The convex carrier 8 also has an air guide channel 7, and its concave shape is adapted to the convex surface of the spherical cover 6. During clamping, the convex surface of the spherical cover is attached to the carrier, and adsorption and fixation are achieved by compressing the O-ring to expel air. Then, a polishing mold is used to press it down and polish the concave surface of the spherical cover 6.

[0021] To improve the sealing performance and rebound reliability of the O-ring 3, the base 4 and the convex carrier 8 are respectively machined with a stepped structure 41 and a groove structure 81 to limit the radial displacement of the O-ring and ensure its working stability.

[0022] This fixture is compatible with various sizes of ball covers 6, such as Φ100mm, Φ150mm, and Φ180mm. During clamping, ensure that the ball cover 6 is aligned with the end face of the workpiece to guarantee a coaxiality of no more than 0.01mm. This fixture is suitable for various polishing equipment such as GJP30.4R and JP035.4B, significantly improving clamping efficiency and polishing accuracy.

[0023] The fixture can process lenses with a center-edge thickness difference of ≤0.005mm, an RMS value of ≤0.02μm, and an aperture number that can be controlled within N≤0.5 apertures, PV≤¼λ, and a surface finish of ≤30-20. It avoids the influence of uneven force on parameters such as N, ΔN, PV, B, and χ when processing dome lenses.

[0024] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although the utility model has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the scope defined by the claims of this utility model.

Claims

1. A ball-shaped polishing clamping fixture, characterized in that, include: It includes a pressure base (2), which is mounted on the spindle (1) of the polishing equipment and has a hollow cavity inside, with a slot (21) on the side wall of the hollow cavity. O-ring (3), which is fitted into the slot (21), is made of elastic material, and releases air when compressed and forms negative pressure when it rebounds; The base (4) is located in the hollow cavity of the pressure base (2) and is in contact with the O-ring (3); The carrier is mounted on the base (4) to support the polishing ball cover (6). The carrier includes a concave carrier (5) and a convex carrier (8). The air guide channel (7) runs through the main shaft (1), pressure base (2), base base (4) and the load.

2. The spherical polishing clamping fixture according to claim 1, characterized in that, The concave carrier (5) and the convex carrier (8) are provided with various specifications.

3. The spherical polishing clamping fixture according to claim 2, characterized in that, The concave carrier (5) is fixed to the base (4) by a threaded connection, and its concave shape matches the concave surface of the ball cover (6) to be polished.

4. The spherical polishing clamping fixture according to claim 2, characterized in that, The convex surface carrier (8) is directly installed in the hollow cavity of the pressure base (2), its outer wall is in contact with the O-ring (3), and it is provided with a concave surface structure that is compatible with the convex surface of the ball cover (6).

5. The spherical polishing clamping fixture according to claim 4, characterized in that, The bottom end face of the convex carrier (8) is also provided with a fixing ring (9) for limiting and assisting the support of the ball cover (6).

6. The spherical polishing clamping fixture according to claim 4, characterized in that, The base (4) and the convex carrier (8) are provided with limiting structures for restricting the radial displacement of the O-ring (3), including a stepped structure (41) or a groove structure (81).

7. The ball cover polishing clamping fixture according to claim 1, characterized in that, The O-ring (3) is an inflatable annular sealing ring or a solid elastomer ring.

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