Clamping jig for sapphire grinding machine machining

Abstract

The utility model relates to the technical field of sapphire processing, and discloses a clamping jig for sapphire grinding machine processing, which is not easy to break chips and higher in processing yield and processing precision, and comprises a base and a limiting component, an adsorption platform with the surface roughness smaller than 0.005 mm is formed on the upper surface of the base, and a first adsorption area and a second adsorption area are arranged on the adsorption platform. A plurality of air suction holes are formed in the first adsorption area, an air groove is formed in the second adsorption area, the aperture of the adsorption holes is smaller than or equal to 2mm, and the width of the air groove is larger than that of the adsorption holes; a vacuum air chamber communicated with the air groove and the air suction holes is arranged in the base, and penetrates through one side wall of the base to form a vacuum interface; the limiting assembly comprises a plurality of inlay blocks which half surround the adsorption platform and are detachably connected with the base, the inlay blocks are attached to the side face of the adsorption platform, the tops of the inlay blocks protrude out of the upper surface of the adsorption platform, and the multiple inlay blocks jointly define a product clamping area.

Description

Technical Field

[0001] The utility model relates to the technical field of sapphire processing, in particular to a clamping fixture used for sapphire grinding machine processing. Background Art

[0002] Sapphire is often used as an optical element in smart devices (such as in cameras) to improve the image acquisition effect of smart devices. Depending on the structure of the camera, special-shaped 3D grooves often need to be processed on the sapphire sheet through a grinding machine. Therefore, the sapphire needs to be clamped to the grinder table for grinding. In order to ensure the grooving effect of the sapphire, the clamping and positioning accuracy of the sapphire needs to reach 0.1mm. At present, the industry mainly uses tools such as vises to clamp sapphire sheets on the workbench. Since the vise has a strong clamping force on the sapphire sheet, when processing thinner products, the vise can easily crush the sapphire sheet, causing product fragments and low product yield. In addition, its positioning accuracy is greater than 0.1mm, and the processing accuracy is poor. Utility Model Content

[0003] Based on this, it is necessary to provide a clamping fixture for sapphire grinding machine processing that is not easy to break, has high processing yield and processing accuracy to address the above shortcomings.

[0004] A clamping fixture for sapphire grinding machine processing is used to clamp a sapphire sheet to be grooved by the grinder. The sapphire sheet has a processing part and a non-processing part. The clamping fixture includes:

[0005] A base, wherein the upper surface of the base is raised to form an adsorption platform, the surface roughness of the upper surface of the adsorption platform is less than 0.003 mm, the upper surface of the adsorption platform is provided with a first adsorption area corresponding to the processing part and a second adsorption area corresponding to the non-processing part, the first adsorption area is provided with a plurality of suction holes penetrating the upper surface of the adsorption platform, the second adsorption area is provided with an air groove penetrating the upper surface of the adsorption platform, the aperture of the adsorption holes is less than or equal to 2 mm, and the width of the air groove is greater than the aperture of the adsorption holes; a vacuum air chamber connected to the air groove and each suction hole is provided in the base, the vacuum air chamber penetrating a side wall of the base to form a vacuum interface on the side wall of the base connected to an external vacuum device; and

[0006] The limiting component includes a plurality of mosaic blocks that semi-surround the adsorption platform and are detachably connected to the base. The side of the mosaic block adjacent to the adsorption platform is in contact with the side of the adsorption platform, and the top of the mosaic block protrudes from the upper surface of the adsorption platform. The plurality of mosaic blocks together enclose a product clamping area.

[0007] In one embodiment, an air guide hole communicating with the vacuum air chamber is opened in the second adsorption area on the adsorption platform, and the air guide hole is correspondingly communicated with the middle of the air groove.

[0008] In one embodiment, the air groove includes a plurality of annular guide grooves arranged around the air guide hole in a circle, each annular guide groove is sequentially connected to the air guide hole, and each annular guide groove has the same width.

[0009] In one embodiment, the annular guide groove is in a square ring structure or a circular ring structure.

[0010] In one embodiment, the diameter of the air suction hole is smaller than half the width of the annular guide groove.

[0011] In one embodiment, a liquid collecting trough is provided on the lower surface of the base at a position corresponding to the first adsorption area, and the liquid collecting trough is connected to the vacuum air chamber. A plurality of through holes are provided on the top surface of the liquid collecting trough, and each through hole is connected to two adjacent suction holes on the first adsorption area, and a shielding portion for partially shielding the suction hole is formed between the two adjacent through holes.

[0012] In one embodiment, a plurality of mounting positions are provided on the upper surface of the base at intervals on the ring side of the adsorption platform, at least one threaded groove is provided at each mounting position, and at least one limiting hole is provided on each mosaic block that passes through the upper and lower surfaces of the mosaic block. The plurality of mosaic blocks are fixed one by one at each mounting position by screws that pass through the limiting holes and are inserted into the threaded grooves.

[0013] In one embodiment, the limiting hole is a countersunk hole.

[0014] In one embodiment, at least one positioning groove is provided beside the thread groove at each mounting position, and at least one positioning post is provided on the lower surface of the mosaic block and is inserted into the positioning groove in a one-to-one correspondence.

[0015] In one embodiment, the lower surface of the mosaic block is provided with two positioning posts symmetrically arranged at both ends of the mosaic block.

[0016] The clamping fixture for sapphire grinding machine processing of the utility model is implemented, and a first adsorption area corresponding to the processing part of the sapphire sheet and a second adsorption area corresponding to the non-processing part are set on the adsorption platform, a plurality of suction holes are set in the first adsorption area, and an air groove is set in the second adsorption area. While the non-processing part on the product is stably adsorbed by the air groove, the adsorption force of the adsorption platform on the processing part of the product is dispersed through the plurality of suction holes to avoid the problem of product fragmentation caused by the thin thickness of the processing part and excessive adsorption force, so as to improve the product processing yield; by changing the surface roughness of the adsorption platform, the product positioning accuracy can be improved, so that the positioning accuracy of the product reaches 0.05mm, which is conducive to improving the processing accuracy of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a structural diagram of a clamping fixture in one embodiment of the present invention;

[0018] Figure 2 This is a schematic diagram of the exploded structure of a clamping fixture in one embodiment of the present utility model;

[0019] Figure 3 This is a schematic cross-sectional view of a clamping fixture in one embodiment of the present invention;

[0020] Figure 4 This is a structural diagram of a base from one perspective in one embodiment of the present invention;

[0021] Figure 5 This is a structural schematic diagram of the base from another perspective in one embodiment of the present invention;

[0022] Figure 6 It is a top view of the base in one embodiment of the present utility model. DETAILED DESCRIPTION

[0023] To make the above-mentioned objects, features, and advantages of the present invention more clearly understood, the following detailed description of specific embodiments of the present invention is provided in conjunction with the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0024] See also Figure 1 The utility model discloses a clamping fixture 10 for sapphire grinding machine processing, which is not easy to break and has high processing yield and processing accuracy. The clamping fixture is used to clamp a sapphire sheet to be grooved by the grinder to achieve the positioning of the sapphire sheet on the grinder workbench. The sapphire sheet has a processing part and a non-processing part, wherein the processing part is the part to be grooved on the sapphire sheet, and the non-processing part is the rest of the sapphire sheet except the part to be grooved. The clamping fixture of this embodiment includes a base 100 and a limiting component. The base 100 is used to provide a positioning place for the sapphire sheet and a place for the grinder to groove. At the same time, the base 100 is also connected to an external vacuum device to fix the sapphire sheet by vacuum adsorption to prevent the sapphire sheet from moving along the thickness direction of the base 100. In addition, the base 100 is also used to jointly limit the position of the sapphire sheet with the limiting component to prevent the sapphire sheet from moving within the plane where the upper surface of the base 100 is located, thereby improving the stability and reliability of the sapphire sheet positioning.

[0025] For details, please combine Figure 1-6 In this embodiment, the upper surface of the base 100 is raised to form an adsorption platform 110, and the surface roughness of the upper surface of the adsorption platform 110 is less than 0.003 mm. Specifically, during the processing of the clamping fixture, the base 100 can be placed on the grinding machine processing platform, and the upper surface and side of the adsorption platform 110 can be fine-tuned using a grinding wheel, and the flatness of the surface of the adsorption platform 110 can be tested using a micrometer until the measured surface roughness of the adsorption platform 110 is less than 0.005 mm. The upper surface of the adsorption platform 110 is provided with a first adsorption area 111 corresponding to the processing part and a second adsorption area 112 corresponding to the non-processing part. The positional relationship and number of the first adsorption area 111 and the second adsorption area 112 are adapted to the shape of the final grooved product of the sapphire sheet. The first adsorption area 111 is provided with a plurality of suction holes 120 that penetrate the upper surface of the adsorption platform 110, and the second adsorption area 112 is provided with an air groove 130 that penetrates the upper surface of the adsorption platform 110. The aperture of the adsorption hole is less than or equal to 2 mm, and the width of the air groove is greater than the aperture of the adsorption hole. A vacuum air chamber 140 is provided in the base 100, which is connected to the air groove 130 and each suction hole 120. The vacuum air chamber 140 penetrates a side wall of the base 100 to form a vacuum interface 150 on the side wall of the base 100 that is connected to an external vacuum device. In this way, when negative pressure is introduced into the vacuum air chamber 140 through the vacuum interface 150, the product is firmly bonded to the adsorption platform 110 mainly through the part that cooperates with the air groove 130 (non-processing part). Since the thickness of the processed part on the final product is less than the thickness of the non-processed part on the product, by setting a plurality of suction holes 120 in the first adsorption area 111, the processed part of the product is made to fit with the first adsorption area 111 and the normal processing of the product is ensured. At the same time, the area of ​​the processed part on the product that cooperates with the negative pressure is reduced, thereby avoiding the problem of product fragmentation caused by excessive adsorption force on the processed part of the product.

[0026] The limiting assembly includes multiple inlay blocks 200 that semi-enclose the adsorption platform 110 and are detachably connected to the base 100. The side of the inlay blocks 200 adjacent to the adsorption platform 110 is in contact with the side of the adsorption platform 110, and the top of the inlay blocks 200 protrudes from the upper surface of the adsorption platform 110. Together, these multiple inlay blocks 200 form a product clamping area. By providing multiple inlay blocks 200 that semi-enclose the adsorption platform 110, the product to be grooved by the grinder can be easily inserted horizontally into the product clamping area from one side of the adsorption platform 110. The multiple inlay blocks 200, combined with the vacuum adsorption force provided by the adsorption platform 110, limit the product's position along the plane of the upper surface of the adsorption platform 110, thereby achieving comprehensive positioning of the product.

[0027] In one embodiment, an air guide hole 113 connected to the vacuum air chamber 140 is provided in the second adsorption area 112 on the adsorption platform 110. The air guide hole 113 is correspondingly connected to the middle of the air groove 130, that is, the air guide hole 113 is arranged in the middle of the air groove 130. In this embodiment, by providing the air groove 130 in the second adsorption area 112, the negative pressure contact area between the non-processed part of the product and the adsorption platform 110 is increased, thereby improving the stability and reliability of the product positioning on the adsorption platform 110. Furthermore, the air groove 130 includes a plurality of annular guide grooves arranged in a circle around the air guide hole 113 as the center, each annular guide groove is sequentially connected and connected to the air guide hole 113, and the width of each annular guide groove is the same. Preferably, the annular guide groove is a square ring structure or a circular ring structure. In this embodiment, the annular guide groove is a square ring structure, that is, the air groove 130 is a U-shaped structure, so that the non-processed part of the product is evenly stressed. Of course, in other embodiments, the air groove 130 can also be a maze structure, a mesh structure, a field structure, a Feng structure or other structures, and the projection pattern of the air groove 130 on the upper surface of the adsorption platform 110 can also be a QR code pattern, which will not be repeated here.

[0028] In this embodiment, by providing a plurality of suction holes 120 within the first adsorption zone 111, the airflow within the vacuum chamber 140 is diverted at the first adsorption zone 111. This allows the processed portion of the product to adhere to the surface of the first adsorption zone 111, preventing the product from being broken due to local vibration during processing. At the same time, the impact of the airflow on the processed portion of the product is reduced, thereby avoiding the problem of the processed portion of the product being broken due to impact due to its thin thickness, thereby reducing the risk of product fragmentation. In one embodiment, the aperture of the suction hole 120 is less than half the width of the annular guide groove. For example, in this embodiment, the aperture of the suction hole 120 is 2 mm, and the width of the annular guide groove is greater than 4 mm. In this way, the clamping fixture of this solution can be used to clamp sapphire sheets with a thickness of 0.3-1 mm on a grinding machine, and its positioning accuracy can reach 0.03 mm.

[0029] Further, please combine Figure 4-6, a liquid collecting tank 160 is provided on the lower surface of the base 100 at the position corresponding to the first adsorption area 111, and the liquid collecting tank 160 is connected to the vacuum air chamber 140. A plurality of through holes 161 are provided on the top surface of the liquid collecting tank 160, and each through hole 161 is connected to two adjacent air suction holes 120 on the first adsorption area 111, and a shielding portion for partially shielding the air suction holes 120 is formed between the two adjacent through holes 161. When the base 100 is fixed on the grinding machine workbench, the grinding machine workbench blocks the notch of the liquid collecting tank 160. After the base 100 is connected to the external vacuum equipment through the vacuum interface 150, negative pressure is formed in the vacuum air chamber 140 at the positions corresponding to the first adsorption area 111 and the second adsorption area 112 respectively. Under the action of negative pressure, the air above the first adsorption area 111 enters the liquid collecting tank 160 in sequence through the air suction holes 120 and the through holes 161, and is further transmitted to the external vacuum equipment through the vacuum air chamber 140 and the vacuum interface 150, thereby forming a gas. Since each through-hole 161 is connected to two adjacent suction holes 120 on the first adsorption zone 111, and the blocking portion partially blocks the suction holes 120, it can also be understood that the through-hole 161 and the suction holes 120 are offset. In this way, while the through-hole 161 connects the suction holes 120 with the vacuum chamber 140, it partially blocks the suction holes 120 to further reduce the aperture of the suction holes 120, thereby further reducing the impact of the first adsorption zone 111 on the product processing part, avoiding product fragmentation and improving product yield. In addition, by providing a liquid collection tank, the coolant during the glass grinding process can enter the liquid collection tank through the adsorption holes and through-holes, preventing the coolant from being sucked into the external vacuum equipment during the glass grinding process. In order to avoid air leakage at the liquid collecting tank 130, in this embodiment, a sealing rubber ring is provided at the edge of the groove of the liquid collecting tank 160. When the base is set on the grinder workbench, the sealing rubber ring is deformed under the extrusion of the grinder workbench to seal the gap at the edge of the groove of the liquid collecting tank 160, thereby avoiding air leakage at the liquid collecting tank 160 and ensuring the stability of the air pressure in the vacuum chamber and the reliability of product adsorption.

[0030] Since the mosaic block 200 fits the side of the adsorption platform 110, and the top of the mosaic block 200 protrudes from the upper surface of the adsorption platform 110, in order to ensure the accuracy of product positioning, after the mosaic block 200 is fixed on the base 100, it is also necessary to use a micrometer to test the straightness (roughness) of the side of the mosaic block 200 located in the product clamping area to ensure that the straightness of the side of the mosaic block 200 located in the product clamping area is less than 0.005mm. In this embodiment, the upper surface of the base 100 is provided with multiple mounting positions at intervals on the ring side of the adsorption platform 110, and the multiple mounting positions are arranged along a U-shaped path. At least one thread groove 170 is provided at each mounting position, and at least one limiting hole 210 is provided on each mosaic block 200 that passes through the upper and lower surfaces of the mosaic block 200. The multiple mosaic blocks 200 are fixed to each mounting position one by one by screws that pass through the limiting holes 210 and are inserted into the thread grooves 170. Furthermore, the limiting holes 210 are countersunk holes. Preferably, in this embodiment, a thread groove 170 is provided at each installation position, the mosaic block 200 is in a strip-shaped structure, and a limiting hole 210 corresponding to the thread groove 170 is provided in the middle of the mosaic block 200. The mosaic block 200 is fixed at the installation position by passing through the limiting hole 210 and inserting a screw into the thread groove 170, and the mosaic block 200 is in contact with the side of the adsorption platform 110.

[0031] To reduce the installation difficulty of the mosaic block 200, in one embodiment, at least one positioning groove 180 is provided at each installation location adjacent to the thread groove 170, and at least one positioning post 220 is provided on the bottom surface of the mosaic block 200, which is inserted into the positioning groove 180 in a one-to-one correspondence. Further preferably, the bottom surface of the mosaic block 200 is provided with two positioning posts 220 symmetrically arranged at both ends of the mosaic block 200. In other words, the two positioning posts 220 are located on opposite sides of the limiting hole 210. By providing two positioning posts 220 spaced apart on the bottom surface of the mosaic block 200, the mosaic block 200 is pre-positioned, facilitating alignment of the limiting hole 210 on the mosaic block 200 with the thread groove 170, thereby reducing the installation difficulty of the mosaic block 200. Furthermore, the mosaic block 200 is prevented from failing to align with the side of the adsorption platform 110 due to rotation of the mosaic block 200 on the top surface of the base 100, thereby ensuring the stability and reliability of the mosaic block 200 in retaining the product.

[0032] Before the sapphire sheet is processed on the grinding machine, the base 100 is first placed on the grinding machine processing platform, and the base 100 is tested for its straightness in the horizontal direction using a micrometer to keep its straightness within 0.005mm; then the solenoid valve of the grinding machine is opened, and the base 100 is mounted on the grinding machine workbench by magnetic fixation, and the flatness of the upper surface of the base 100 and the upper surface of the adsorption platform 110 is checked using a micrometer. If the flatness exceeds 0.005mm, it is necessary to use a flat grinding wheel to fine-tune the upper surface of the base 100 and the upper surface of the adsorption platform 110 until its flatness reaches within 0.003mm. Remove the burrs on the surface of the adsorption platform 110 and clean the impurities in the air groove 130 to ensure that there are no particles or other residues to prevent the product from breaking when inhaling. Install the mosaic block 200 at the mounting position of the base 100 and lock it with screws. Use a micrometer to check the levelness of the mosaic block 200, and connect the vacuum interface 150 to the external vacuum equipment. Next, turn on the grinding machine's cutting fluid, ensuring it completely covers the adsorption platform 110. Push the product along one side of the adsorption platform 110 into the product clamping area and activate the external vacuum system. Finally, use a feeler gauge to check for gaps or leaks around the product. Use a micrometer to check the surface flatness, ensuring it's within 0.005mm. Turn on the machine settings and begin machining the grooves on the product. Once machining is complete, disconnect the base 100 from the external vacuum system and slowly remove the product.

[0033] The clamping fixture 10 for sapphire grinding machine processing of the present invention is implemented, and a first adsorption area 111 corresponding to the processing part of the sapphire sheet and a second adsorption area 112 corresponding to the non-processing part are set on the adsorption platform 110. A plurality of suction holes 120 are set in the first adsorption area 111, and an air groove 130 is set in the second adsorption area 112. While the non-processing part on the product is stably adsorbed by the air groove 130, the adsorption force of the adsorption platform 110 on the processing part of the product is dispersed through the plurality of suction holes 120 to avoid the problem of product fragmentation caused by the thin thickness of the processing part and excessive adsorption force on the product, so as to improve the product processing yield; by changing the surface roughness of the adsorption platform 110, the product positioning accuracy can be improved, so that the product positioning accuracy reaches 0.05mm, which is conducive to improving the processing accuracy of the product.

[0034] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0035] The above-described embodiments merely represent several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present utility model patent shall be determined by the appended claims.

Claims

1. A clamping fixture for sapphire grinding, used for clamping a sapphire sheet to be grooved by a grinder, wherein the sapphire sheet has a processing area and a non-processing area, and is characterized in that: Clamping fixtures include: A base, wherein the upper surface of the base is raised to form an adsorption platform, the surface roughness of the upper surface of the adsorption platform is less than 0.003 mm, the upper surface of the adsorption platform is provided with a first adsorption area corresponding to the processing part and a second adsorption area corresponding to the non-processing part, the first adsorption area is provided with a plurality of suction holes penetrating the upper surface of the adsorption platform, the second adsorption area is provided with an air groove penetrating the upper surface of the adsorption platform, the aperture of the adsorption holes is less than or equal to 2 mm, and the width of the air groove is greater than the aperture of the adsorption holes; a vacuum air chamber connected to the air groove and each suction hole is provided in the base, the vacuum air chamber penetrating a side wall of the base to form a vacuum interface on the side wall of the base connected to an external vacuum device; and The limiting component includes a plurality of mosaic blocks that semi-surround the adsorption platform and are detachably connected to the base. The side of the mosaic block adjacent to the adsorption platform is in contact with the side of the adsorption platform, and the top of the mosaic block protrudes from the upper surface of the adsorption platform. The plurality of mosaic blocks together enclose a product clamping area.

2. The clamping fixture for sapphire grinding machine processing according to claim 1 is characterized in that: An air guide hole communicating with the vacuum air chamber is opened in the second adsorption area on the adsorption platform, and the air guide hole is correspondingly communicated with the middle of the air groove.

3. The clamping fixture for sapphire grinding machine processing according to claim 2 is characterized in that: The air groove includes a plurality of annular guide grooves arranged around the air guide hole in a circle. The annular guide grooves are sequentially connected to the air guide hole and have the same width.

4. The clamping fixture for sapphire grinding machine processing according to claim 3 is characterized in that: The annular guide groove is in a square ring structure or a circular ring structure.

5. The clamping fixture for sapphire grinding machine processing according to claim 3 is characterized in that: The diameter of the air suction hole is smaller than half of the width of the annular guide groove.

6. The clamping fixture for sapphire grinding machine processing according to claim 1, characterized in that: A liquid collecting trough is provided on the lower surface of the base at a position corresponding to the first adsorption area, and the liquid collecting trough is connected to the vacuum air chamber. A plurality of through holes are provided on the top surface of the liquid collecting trough, each of which is connected to two adjacent suction holes on the first adsorption area, and a shielding portion for partially shielding the suction hole is formed between the two adjacent through holes.

7. The clamping fixture for sapphire grinding machine processing according to claim 1 is characterized in that: The upper surface of the base is provided with a plurality of mounting positions at intervals on the ring side of the adsorption platform, each mounting position is provided with at least one threaded groove, and each mosaic block is provided with at least one limiting hole penetrating the upper and lower surfaces of the mosaic block, and the plurality of mosaic blocks are fixed one by one at each mounting position by screws penetrating the limiting holes and inserted into the threaded grooves.

8. The clamping fixture for sapphire grinding machine processing according to claim 7, characterized in that: The limiting hole is a countersunk hole.

9. The clamping fixture for sapphire grinding machine processing according to claim 7, characterized in that: At least one positioning groove is provided on each installation position beside the thread groove, and at least one positioning column is provided on the lower surface of the mosaic block and is inserted into the positioning groove in a one-to-one correspondence.

10. The clamping fixture for sapphire grinding machine processing according to claim 9, characterized in that: The lower surface of the mosaic block is provided with two positioning posts symmetrically arranged at both ends of the mosaic block.

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