Sapphire Window Polishing and Lapping Device and Its Clamping Fixture

Abstract

The present invention discloses a lapping and polishing device for a sapphire window and a clamping fixture thereof. The clamping fixture of the lapping and polishing device for the sapphire window includes a chuck, a marble plate, a flexible buffer pad and a clamping ring which are arranged in sequence from top to bottom. Among them, the clamping ring includes a bottom plate and side plates arranged around the side surface of the bottom plate. A clamping groove adapted to the shape of the sapphire window is formed on the bottom plate for sleeving outside the sapphire window to realize grinding and polishing clamping processing. The marble plate and the side plate of the clamping ring are detachably connected by fasteners. The flexible buffer pad is located between the bottom plate and the marble plate. A stylus holder is installed on the chuck. The clamping fixture of the lapping and polishing device for the sapphire window proposed by the present invention is simple to operate and has strong versatility.

Description

Technical Field

[0001] The present invention relates to the technical field of grinding and polishing devices, and particularly to a sapphire window grinding and polishing device and its clamping fixture. Background Art

[0002] With the continuous development of science and technology, the requirements for window materials with optoelectronic properties and other functions have gradually increased, and the performance of traditional optical glass windows can no longer meet the existing practical application standards. The characteristics of single crystal sapphire determine that it can be widely used as an optical window in national defense technologies such as submarines, missiles, satellite space technologies, and military infrared devices.

[0003] Due to the characteristics of high hardness, high brittleness, and stable chemical properties of sapphire crystals, it is difficult to grind and polish sapphire crystals, and the processing time is long. In addition, sapphire windows have various shapes, resulting in the need to customize specific devices for grinding and polishing sapphire windows of different sizes and shapes to suit different shapes, sizes, and processes of sapphire windows. Summary of the Invention

[0004] The main purpose of the present invention is to provide a sapphire window grinding and polishing device and its clamping fixture, aiming at simple operation and strong versatility.

[0005] To achieve the above object, the present invention provides a clamping fixture for a sapphire window grinding and polishing device, including a chuck, a marble plate, a flexible buffer pad, and a clamping ring arranged in sequence from top to bottom. Among them, the clamping ring includes a bottom plate and side plates arranged around the side surface of the bottom plate. The side plates of the clamping ring are closed and surrounded to form a slot located above the bottom plate. The shape of the slot is adapted to the outer shape of the marble plate. A slot adapted to the shape of the sapphire window is opened on the bottom plate of the clamping ring for sleeving outside the sapphire window to achieve grinding and polishing clamping and processing. The marble plate and the side plates of the clamping ring are detachably connected by fasteners. The flexible buffer pad is located between the bottom plate and the marble plate, and a stylus holder is installed on the chuck.

[0006] Preferably, the flexible buffer pad is pasted under the marble plate.

[0007] Preferably, a plurality of threaded sleeves for connecting with the clamping ring are installed on the side wall of the marble plate, and weight-reducing holes are opened on the top surface of the marble plate.

[0008] Preferably, a plurality of L-shaped claws are detachably installed on the chuck. The plurality of L-shaped claws are evenly arranged in the circumferential direction of the chuck. All the L-shaped claws can slide radially along the chuck to adjust the installation position, and the plurality of L-shaped claws cooperate to jointly clamp the outer side wall of the marble plate.

[0009] Preferably, a plurality of sets of threaded holes are provided on the top surface of the chuck, and the threaded holes in each set of threaded holes are evenly arranged in the circumferential direction of the chuck. The fastener passes through the L-shaped jaw and the threaded hole of the chuck to fix the L-shaped jaw on the chuck.

[0010] Preferably, both the L-shaped jaw and the stylus base are detachably connected to the chuck through fasteners, and the bottom surface of the L-shaped jaw abuts against the top surface of the side plate of the clamping ring.

[0011] Preferably, the thickness of the flexible buffer pad is 1 mm to 1.5 mm, the bottom surface of the flexible buffer pad is self-adhesive, and the flexible buffer pad is connected to the lower surface of the marble flat plate through the adhesive.

[0012] Preferably, the thickness of the bottom plate of the clamping ring is 1 mm to 3 mm less than the thickness of the sapphire window.

[0013] Preferably, a plurality of through holes are provided on the side plate of the clamping ring, and the plurality of through holes are evenly arranged in the circumferential direction of the side plate of the clamping ring. The fastener passes through the through holes on the side plate and is connected to the marble flat plate.

[0014] The present invention further provides a sapphire window polishing device, including the clamping fixture of the above-mentioned sapphire window polishing device.

[0015] The clamping fixture of the sapphire window polishing device proposed by the present invention has the following beneficial effects:

[0016] 1. The self-weight of the marble flat plate provides a strong downward pressure for the polishing of the sapphire window, effectively improving the polishing removal efficiency of the sapphire material. At the same time, because the price of the marble flat plate is relatively high, the marble flat plate and the clamping ring are detachably connected. For different sapphire windows, only the clamping ring needs to be replaced. On the one hand, the versatility of the clamping fixture is improved, and on the other hand, the overall production cost of the clamping fixture can be reduced;

[0017] 2. By providing a flexible buffer pad under the marble flat plate, the upper surface of the sapphire window can be protected;

[0018] 3. The clamping fixture of the present invention can buckle the clamping ring above the sapphire window, and then install the upper parts. Its operation is simple, the structure is reliable and it is easy to implement. Description of the Drawings

[0019] Figure 1 is the front view structural schematic diagram of the clamping fixture of the sapphire window polishing device of the present invention;

[0020] Figure 2 is the exploded structural schematic diagram of the clamping fixture of the sapphire window polishing device of the present invention;

[0021] Figure 3It is a schematic exploded view of a chuck in a clamping fixture of a sapphire window grinding and polishing device of the present invention;

[0022] Figure 4 It is a schematic top view of a clamping fixture of a sapphire window grinding and polishing device of the present invention.

[0023] In the figure, 1 is a chuck; 2 is a marble flat plate; 3 is a flexible buffer pad; 4 is a snap ring; 5 is a sapphire window; 6 is an L-shaped claw; 9 is an iron pen holder; 10 is a disc.

[0024] The realization, functional features and advantages of the object of the present invention will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0025] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0026] It should be noted that in the description of the present invention, the orientation or positional relationship indicated by the terms "horizontal", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", 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, and does not indicate or imply 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 of the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0027] The present invention provides a clamping fixture for a sapphire window grinding and polishing device.

[0028] Referring to Figures 1 to 4 , in this preferred embodiment, a clamping fixture for a sapphire window grinding and polishing device includes a chuck 1, a marble flat plate 2, a flexible buffer pad 3 and a snap ring 4 arranged in sequence from top to bottom. Among them, the snap ring 4 includes a bottom plate and side plates arranged around the side of the bottom plate. The side plates of the snap ring 4 are closed and surrounded to form a slot above the bottom plate. The shape of the slot is adapted to the outer shape of the marble flat plate 2 (the bottom of the marble flat plate 2 just fits into the slot). A slot adapted to the shape of the sapphire window 5 is opened on the bottom plate for sleeving outside the sapphire window 5 to realize grinding and polishing clamping processing. The marble flat plate 2 and the side plates of the snap ring 4 are detachably connected by fasteners. The flexible buffer pad 3 is located between the bottom plate and the marble flat plate 2, and an iron pen holder 9 is installed on the chuck 1.

[0029] In this embodiment, the flexible buffer pad 3 is pasted under the marble flat plate 2. On the one hand, it avoids the flexible buffer pad 3 from being easily loosened, and on the other hand, the pasting installation method is simple and easy to operate.

[0030] Specifically, in this embodiment, the flexible buffer pad 3 can be made of a polyurethane pad, and the material of the snap ring 4 can be polytetrafluoroethylene or bakelite, preferably polytetrafluoroethylene. The self-weight of the marble plate 2 provides a strong downward pressure for the lapping and polishing of the sapphire window 5, effectively improving the lapping and removal efficiency of the sapphire material.

[0031] Specifically, referring to Figure 2 , a plurality of threaded sleeves for connecting with the snap ring 4 are installed on the side wall of the marble plate 2, and a plurality of weight-reducing holes are provided on the top surface of the marble plate 2.

[0032] Referring to Figure 3 and Figure 4 , a plurality of L-shaped claws 6 are detachably installed on the chuck 1 (in this figure, 3 L-shaped claws 6 are set as an example for illustration, and the chuck 1 includes a disc 10 and three L-shaped claws 6). The plurality of L-shaped claws 6 are evenly arranged in the circumferential direction of the chuck 1, and all the L-shaped claws 6 can slide radially along the chuck 1 to adjust the installation position. In this embodiment, by setting the L-shaped claws 6, it is convenient to adjust the center of gravity position of the spindle during lapping and polishing at any time, which plays an important role in quickly correcting the edge thickness difference index of the large-size sapphire window.

[0033] In this embodiment, referring to Figure 4 , a plurality of sets of threaded holes are provided on the top surface of the chuck 1 (in this figure, 2 sets are provided as an example for illustration, and each set of threaded holes includes 6 threaded holes). The threaded holes on each set of threaded holes are evenly arranged in the circumferential direction of the chuck 1. The fasteners pass through the L-shaped claws 6 and the threaded holes on the chuck 1 to fix the L-shaped claws 6 on the chuck 1, and the plurality of L-shaped claws 6 cooperate to jointly clamp on the outer side wall of the marble plate 2.

[0034] Specifically, both the L-shaped claws 6 and the stylus holder 9 are detachably connected to the chuck 1 through fasteners, so as to facilitate the replacement of the L-shaped claws 6 and the stylus holder 9. The bottom surface of the L-shaped claws 6 abuts against the top surface of the side plate of the snap ring 4.

[0035] Specifically, the thickness of the flexible buffer pad 3 is 1 mm to 1.5 mm. The bottom surface of the flexible buffer pad 3 has self-adhesive, and the flexible buffer pad 3 is connected to the lower surface of the marble plate 2 through the self-adhesive. The thickness of the bottom plate of the snap ring 4 is 1 mm to 3 mm less than the thickness of the sapphire window 5.

[0036] Referring to Figure 2 , a plurality of through holes are provided on the side plate of the snap ring 4 (in this figure, 12 Φ6 mm through holes are evenly distributed on the side plate). The plurality of through holes are evenly arranged in the circumferential direction of the side plate of the snap ring 4. The fasteners pass through the through holes on the side plate and are connected to the marble plate 2.

[0037] The bottom surface of the marble flat plate 2 is polished and inspected using a Class A optical flat template. The entire lower surface is polished to a surface shape aperture N ≤ 1 within each Φ150mm diameter area and a local aperture △N ≤ 0.3 when inspected with the Class A optical template.

[0038] The working principle of this clamping fixture is as follows.

[0039] 1. Select a flexible cushion 3 with the same size as the marble flat plate 2, paste the adhesive side of the flexible cushion 3 onto the bottom surface of the marble flat plate 2, and place it on a clean and flat tabletop to press it flat.

[0040] 2. Place the surface to be processed of the sapphire window 5 face down steadily on the polishing disc surface of the grinding and polishing machine. Select a suitable clamping ring 4 according to the sapphire window 5 (multiple sets of clamping rings 4 can be configured to match different-shaped sapphire windows 5), and buckle the clamping ring 4 above the sapphire window 5.

[0041] 3. Place the marble flat plate 2 with the flexible cushion 3 pasted on it above the clamping ring 4, rotate the marble flat plate 2 so that the side thread sleeve aligns with the through hole on the side plate of the clamping ring 4, and use an M5 hexagon socket head cap screw to fix the marble flat plate 2 and the clamping ring 4 together.

[0042] 4. According to the parallelism difference distribution of the sapphire window 5 to be ground and polished, loosen the fastening screws of all L-shaped jaws 6 to adjust the center of gravity position of the chuck 1. After adjustment, lock the L-shaped jaws 6 with the fastening screws, and install the chuck 1 on the upper surface of the marble flat plate 2 and clamp it tightly.

[0043] 5. Insert the spindle stylus of the grinding and polishing equipment into the stylus holder 9 for grinding and polishing.

[0044] The clamping fixture of the sapphire window grinding and polishing device proposed in this embodiment has the following beneficial effects:

[0045] 1. The self-weight of the marble flat plate 2 provides a strong downward pressure for the grinding and polishing of the sapphire window, effectively improving the grinding and polishing removal efficiency of the sapphire material. At the same time, since the marble flat plate 2 is relatively expensive, the marble flat plate 2 and the clamping ring 4 are detachably connected. For different sapphire windows, only the clamping ring 4 needs to be replaced. On the one hand, the compatibility of this clamping fixture is improved, and on the other hand, the overall production cost of the clamping fixture can be reduced.

[0046] 2. By setting a flexible cushion 3 under the marble flat plate 2, the upper surface of the sapphire window can be protected.

[0047] 3. This clamping fixture only needs to buckle the clamping ring 4 above the sapphire window, and then install the upper parts. Its operation is simple, the structure is reliable, and it is easy to implement.

[0048] The present invention further proposes a sapphire window grinding and polishing device.

[0049] In this preferred embodiment, a sapphire window grinding and polishing device includes a clamping fixture of the sapphire window grinding and polishing device. The specific structure and beneficial effects of the clamping fixture are referred to the above embodiment and will not be elaborated here.

[0050] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be similarly included in the patent protection scope of the present invention.

Claims

1. A clamping fixture for a sapphire window grinding and polishing device, characterized in that, It includes a chuck, a marble plate, a flexible buffer pad, and a clamping ring arranged in sequence from top to bottom. Among them, the clamping ring includes a bottom plate and side plates arranged around the side of the bottom plate. The side plates of the clamping ring are closed and surrounded to form a slot located above the bottom plate. The shape of the slot is adapted to the outer shape of the marble plate. A slot adapted to the shape of the sapphire window is provided on the bottom plate of the clamping ring for sleeving outside the sapphire window to achieve grinding and polishing clamping processing. The marble plate and the side plates of the clamping ring are detachably connected by fasteners. The flexible buffer pad is located between the bottom plate and the marble plate. A stylus holder is installed on the chuck; a plurality of L-shaped clamping claws are detachably installed on the chuck. The plurality of L-shaped clamping claws are evenly arranged in the circumferential direction of the chuck. All the L-shaped clamping claws can slide radially along the chuck to adjust the installation position. The plurality of L-shaped clamping claws cooperate to jointly clamp on the outer side wall of the marble plate.

2. The clamping fixture of the sapphire window grinding and polishing device according to claim 1, characterized in that, The flexible buffer pad is pasted under the marble plate.

3. The clamping fixture of the sapphire window grinding and polishing device according to claim 1, characterized in that, A plurality of threaded sleeves for connecting with the clamping ring are installed on the side wall of the marble plate, and weight-reducing holes are provided on the top surface of the marble plate.

4. The clamping fixture of the sapphire window grinding and polishing device according to claim 1, characterized in that, A plurality of groups of threaded holes are provided on the top surface of the chuck. The threaded holes in each group of threaded holes are evenly arranged in the circumferential direction of the chuck. The fasteners pass through the L-shaped clamping claws and the threaded holes of the chuck to fix the L-shaped clamping claws on the chuck.

5. The clamping fixture of the sapphire window grinding and polishing device according to claim 1, characterized in that, Both the L-shaped clamping claws and the stylus holder are detachably connected to the chuck by fasteners. The bottom surface of the L-shaped clamping claw abuts against the top surface of the side plate of the clamping ring.

6. The clamping fixture of the sapphire window grinding and polishing device according to claim 1, characterized in that, The thickness of the flexible buffer pad is 1 mm to 1.5 mm. The bottom surface of the flexible buffer pad has self-adhesive. The flexible buffer pad is connected to the lower surface of the marble plate through the self-adhesive.

7. The clamping fixture of the sapphire window grinding and polishing device according to claim 1, characterized in that, The thickness of the bottom plate of the clamping ring is 1 mm to 3 mm less than the thickness of the sapphire window.

8. The clamping fixture of the sapphire window grinding and polishing device according to any one of claims 1 to 7, characterized in that A plurality of through holes are provided on the side plate of the clamping ring. The plurality of through holes are evenly arranged in the circumferential direction of the side plate of the clamping ring. The fasteners pass through the through holes on the side plate and are connected to the marble plate.

9. A sapphire window grinding and polishing device, characterized in that, A clamping fixture including the sapphire window grinding and polishing device according to any one of claims 1 to 8.

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