Method for improving interference fringes and poor PV value of camera holes in 3D glass cover plates

Abstract

The present invention discloses a method for improving the interference fringes and poor PV value of the camera hole of a 3D glass cover plate, belonging to the technical field of glass. The technical solution is as follows: It includes the following steps: S1 Install a concave masking fixture on the forming surface of the hot bending female die of the processed 3D glass cover plate; S2 Use a brush and abrasive paste to polish the position of the camera hole on the hot bending female die in step S1 to process a circular concave pit; S3 Install a convex masking fixture on the forming surface of the hot bending male die of the processed 3D glass cover plate; S4 Use a brush and abrasive paste to polish the position of the camera hole on the hot bending male die in step S3 to process a circular concave pit. The present invention solves the problems of interference fringes and poor PV value caused by poor surface accuracy of the camera hole of the 3D glass cover plate from the source hot bending process, reduces the generation of defective products after the polishing process and the secondary repair of defective products.

Description

Technical Field

[0001] The present invention relates to the technical field of glass, and specifically relates to a method for improving the interference fringes and poor PV value of the camera hole of a 3D glass cover plate. Background Art

[0002] At present, most smart phones or smart terminals on the market have a front camera, and the camera has extremely high requirements for the surface accuracy of the panel. Interference fringes and PV value are the main indicators for evaluating the surface shape accuracy of the mirror surface, and they are one of the main factors affecting the imaging of mobile phones. If the unqualified 3D glass cover plate of the mobile phone is put into use, it will have a greater impact on the camera function of the smart terminal. The processing process of the glass cover plate will affect the interference fringes and PV value of the camera hole position. Therefore, improving the surface shape accuracy of the camera hole position has become the key point in the research of the 3D glass cover plate display screen process.

[0003] In the prior art, the interference fringes and poor PV value that occur during the processing of the cover plate are usually solved by polishing and repairing methods. For example, Chinese invention patent CN114290128A discloses a method for repairing the interference fringes and PV of 3D mobile phone glass, which specifically includes the following steps: installing a grinding base in the shape of a quadrangular prism on the concave surface of the 3D mobile phone glass, and fitting the concave surface with the lower surface of the grinding base; fixing the upper surface of the grinding base on the lower surface of the loading plate of the flipping polishing machine; laying a polishing blanket on the chassis of the flipping polishing machine; starting the flipping polishing machine, and rotating the loading plate and the chassis of the flipping polishing machine in opposite directions to polish the convex surface of the 3D mobile phone glass; after the convex surface is polished, detecting the polishing result of the convex surface of the 3D mobile phone glass, and if it meets the polishing standard, proceeding to the next step, and if it does not meet the standard, it is regarded as a defective product and discarded; taking out the 3D mobile phone glass from the flipping polishing machine, putting the 3D mobile phone glass into a ring sleeve base matching the convex surface of the 3D mobile phone glass, and fitting the convex surface of the 3D mobile phone glass with the ring sleeve base; using a rotatable brush to polish the concave surface of the 3D mobile phone glass above the ring sleeve base.

[0004] In the above method, the interference fringes and poor PV value generated after polishing the 3D glass cover plate after hot bending can be effectively repaired, and the poor problems generated on the surface of the glass cover plate in the prior art are solved. However, the root cause of the problem is that the surface processing marks of the hot bending mold are transferred to the cover plate during the hot bending process of the 3D glass cover plate, affecting the surface accuracy of the camera hole, thereby causing interference fringes and poor PV value. And through the polishing repair method, the one-time repair rate is relatively low. Therefore, the above method still has the problems of repeated repair of defective products generated in the normal processing process and high cost.

[0005] Based on this, it is necessary to transform the hot bending die to improve the interference fringes and poor PV value of the camera holes of the 3D glass cover plate, so as to solve the problems of interference fringes and poor PV value caused by the poor surface accuracy of the camera holes of the 3D glass cover plate from the source hot bending process. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a method for improving the interference fringes and poor PV value of the camera holes of the 3D glass cover plate, solve the problems of interference fringes and poor PV value caused by the poor surface accuracy of the camera holes of the 3D glass cover plate from the source hot bending process, and reduce the generation of defective products after the polishing process and the secondary repair of defective products.

[0007] The technical solution of the present invention is as follows:

[0008] A method for improving the interference fringes and poor PV value of the camera holes of the 3D glass cover plate, comprising the following steps:

[0009] S1 Install a concave surface shielding jig on the forming surface of the hot bending female die of the processed 3D glass cover plate;

[0010] S2 Use a brush and abrasive paste to polish the position of the camera hole on the hot bending female die in step S1 to process a circular concave pit;

[0011] S3 Install a convex surface shielding jig on the forming surface of the hot bending male die of the processed 3D glass cover plate;

[0012] S4 Use a brush and abrasive paste to polish the position of the camera hole on the hot bending male die in step S3 to process a circular concave pit.

[0013] Preferably, the hot bending female die and the hot bending male die are graphite dies.

[0014] Preferably, the concave surface shielding jig and the convex surface shielding jig are made of acrylic plates, and the contours are respectively in one-to-one imitation of the contours of the hot bending female die and the hot bending male die. Through holes are provided at the positions corresponding to the camera holes on the concave surface shielding jig and the convex surface shielding jig. The aperture of the through hole is enlarged by 0.1 - 0.12 mm on the basis of the aperture of the camera hole of the 3D glass cover plate, and the hole is tapered 28° - 30° in the upward surface direction.

[0015] Preferably, the thickness of the acrylic plate is 0.5 - 0.6 mm.

[0016] Preferably, in steps S2 and S4, a processing device is used to polish the hot bending female die and the hot bending male die. The processing device includes a workbench, on which the hot bending female die and the hot bending male die are detachably fixed. The workbench is arranged on the slider of the first ball screw, and the first ball screw is arranged on the slider of the second ball screw. The first ball screw and the second ball screw drive the workbench to move along the X direction and the Y direction respectively. A bracket is arranged on one side of the workbench, and a hydraulic cylinder is installed on the bracket. The piston rod of the hydraulic cylinder faces downward and is connected to a motor. The output shaft of the motor is connected to a brush, and the brush is located above the workbench.

[0017] Preferably, the brush is a nylon brush with a diameter of 10 - 12 mm, a hair length of 10 - 12 mm, and a hair thickness of 0.1 - 0.12 mm.

[0018] Preferably, the grinding paste is diamond grinding paste with 1800 - 2000 mesh.

[0019] Preferably, the depth of the circular pit is 0.002 - 0.004 mm.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The present invention reforms the hot bending die, and respectively processes circular pits with appropriate depths at the positions corresponding to the camera holes of the glass cover plate on the hot bending female die and the hot bending male die. Thus, during the hot bending process, local clearance can be achieved between the product and the hot bending die, reducing the local transfer pressure, thereby improving the surface accuracy of the camera hole position of the 3D glass cover plate, solving the problems of interference fringes and poor PV value caused by poor surface accuracy of the camera hole of the 3D glass cover plate from the source hot bending process, and reducing the generation of defective products after the polishing process and the secondary repair of defective products. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative efforts.

[0023] Figure 1 It is a schematic diagram of using a brush and grinding paste to polish the hot bending female die in the present invention.

[0024] Figure 2 It is a schematic diagram of hot bending and forming a 3D glass cover plate using the hot bending die reformed by the present invention.

[0025] Figure 3 It is a schematic diagram of the structure of the processing device of the present invention.

[0026] In the figure, 101 is a hot bending female die; 102 is a hot bending male die; 103 is a circular pit; 2 is a 3D glass cover plate; 201 is a camera hole; 3 is a brush; 4 is an acrylic plate; 501 is a workbench; 502 is a first mounting platform; 503 is a first guide rail; 504 is a second ball screw; 505 is a second mounting platform; 506 is a second guide rail; 507 is a second slider; 508 is a bracket; 509 is a hydraulic cylinder; 510 is a connecting block; 511 is a motor. Detailed implementation manners

[0027] In order to enable those skilled in the art to better understand the technical solutions in the present invention, 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. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0028] Embodiment 1

[0029] In this embodiment, the position corresponding to the camera hole 201 of the 3D glass cover plate 2 on the hot bending die is processed to generate a circular pit 103, so as to improve the interference fringes and poor PV value of the camera hole 201 of the 3D glass cover plate 2. The specific steps are as follows:

[0030] S1: Install a concave surface shielding fixture on the forming surface of the processed hot bending female die 101 of the 3D glass cover plate 2. Specifically: as Figure 1 shown, the hot bending female die 101 is a graphite die, and the concave surface shielding fixture uses an acrylic plate 4 with a thickness of 0.5 mm, and the contour is one-to-one imitated with the contour of the hot bending female die 101 of the 3D glass cover plate 2; the position corresponding to the camera hole 201 on the acrylic plate 4 is a through hole, and the hole diameter is enlarged by 0.1 mm on the basis of the hole diameter of the product camera hole 201, and the hole is tapered 30° in the direction of the upper surface;

[0031] S2: As Figures 2-3 shown, clamp the female die in step S1 to the processing device, and use a nylon brush 3 and diamond grinding paste to process the position of the camera hole 201 of the hot bending female die 101. Specifically: the brush 3 has a diameter of 10 mm, a hair length of 10 mm, and a hair thickness of 0.1 mm; 2000-mesh diamond grinding paste is added during the processing, the brush 3 presses 2 mm over the die surface, the rotation speed is 200 r / min, the processing time is 120 s, and a circular pit 103 with a depth of 0.003 mm is processed;

[0032] S3: Install a convex surface shielding fixture on the forming surface of the hot bending male mold 102 of the processed 3D glass cover plate 2. Specifically: the male mold is a graphite mold, the convex surface shielding fixture uses an acrylic plate 4 with a thickness of 0.5 mm, and the contour is in one-to-one imitation of the contour of the hot bending male mold 102 of the 3D glass cover plate 2. The position corresponding to the camera hole 201 on the acrylic plate 4 is a through hole, and the hole diameter is enlarged by 0.1 mm based on the hole diameter of the product camera hole 201, and the hole is tapered 30° in the direction of the upper surface;

[0033] S4: Clamp the hot bending male mold 102 obtained in step S3 onto the processing device, and use a nylon brush 3 and diamond grinding paste to process the position of the camera hole 201 of the hot bending male mold 102. Specifically: the brush 3 has a diameter of 10 mm, a hair length of 10 mm, and a hair thickness of 0.1 mm; 2000-mesh diamond grinding paste is added during the processing, the brush 3 presses 2 mm over the mold surface, the rotation speed is 200 r / min, the processing time is 120 s, and a circular pit 103 with a depth of 0.003 mm is processed.

[0034] Among them, as Figure 3As shown in the figure, the processing device includes a workbench 501. The hot bending female die 101 and the hot bending male die 102 are detachably fixed on the workbench 501 by screws. The workbench 501 is arranged on the slider of the first ball screw. The first ball screw is arranged on the first installation platform 502. On both sides of the first ball screw on the first installation platform 502, first guide rails 503 are respectively arranged. At the position corresponding to the first guide rails 503 at the bottom of the workbench 501, first sliders are arranged. The first sliders are arranged on the first guide rails 503 through grooves. When the workbench 501 moves along the X direction driven by the first ball screw, the first guide rails 503 can make its movement smoother. The first installation platform 502 is arranged on the slider of the second ball screw 504. The second ball screw 504 is arranged on the second installation platform 505. On both sides of the second ball screw 504 on the second installation platform 505, second guide rails 506 are respectively arranged. At the position corresponding to the second guide rails 506 at the bottom of the first installation platform 502, second sliders 507 are arranged. The second sliders 507 are arranged on the second guide rails 506 through grooves. When the first installation platform 502 moves along the Y direction driven by the second ball screw 504, the second guide rails 506 can make its movement smoother. On one side of the workbench 501, a bracket 508 is arranged. A hydraulic cylinder 509 is installed on the bracket 508. The piston rod of the hydraulic cylinder 509 faces downward and is connected with a motor 511 through a connecting block 510. The output shaft of the motor 511 is connected with a brush 3. The brush 3 is located above the workbench 501. The hydraulic cylinder 509 drives the brush 3 to move up and down along the Z direction to approach or move away from the hot bending female die 101 or the hot bending male die 102. In order to ensure that the brush 3 moves more smoothly, third guide rails can be arranged on both sides of the hydraulic cylinder 509 on the bracket 508. At the position corresponding to the third guide rails on the connecting block 510, third sliders are arranged. The third sliders are arranged on the third guide rails through grooves. After the hot bending female die 101 or the hot bending male die 102 is fixed on the workbench 501, the brush 3 can be aligned with the position corresponding to the camera hole 201 on the hot bending female die 101 or the hot bending male die 102 through the first ball screw, the second ball screw 504 and the hydraulic cylinder 509, and the position can be polished and processed.

[0035] Comparative Example 1

[0036] The difference from Example 1 is that in Comparative Example 1, the position corresponding to the product camera hole 201 on the hot bending die is not processed.

[0037] Comparative Example 2

[0038] In Comparative Example 2, the position corresponding to the product camera hole 201 on the hot bending die of the 3D glass cover plate 2 is processed to generate a circular pit 103 to improve the interference fringes and poor PV value of the camera hole 201 of the 3D glass cover plate 2. The specific steps are as follows:

[0039] S1: Install a concave surface shielding jig on the forming surface of the hot bending female die 101 of the processed 3D glass cover plate 2. Specifically: AsFigure 1 As shown, the hot bending female die 101 is a graphite die. The concave surface shielding fixture uses an acrylic plate 4 with a thickness of 0.5 mm, and its contour is an exact one-to-one copy of the contour of the 3D glass cover plate 2 and the hot bending female die 101. The position corresponding to the camera hole 201 on the acrylic plate 4 is a through hole, and the hole diameter is enlarged by 0.1 mm based on the hole diameter of the product camera hole 201. The hole is tapered 30° in the upward surface direction.

[0040] S2: As Figures 2-3 shown, clamp the female die in step S1 onto the processing device, and use a nylon brush 3 and diamond grinding paste to process the position of the camera hole 201 of the hot bending female die 101. Specifically: the diameter of the brush 3 is 10 mm, the hair length is 10 mm, and the hair thickness is 0.1 mm. Add 2000-mesh diamond grinding paste during the processing. The brush 3 presses 2 mm over the die surface, the rotation speed is 200 r / min, and the processing time is 240 s to process a circular concave pit 103 with a depth of 0.006 mm.

[0041] S3: Install a convex surface shielding fixture on the forming surface of the hot bending male die 102 of the processed 3D glass cover plate 2. Specifically: the male die is a graphite die, the convex surface shielding fixture uses an acrylic plate 4 with a thickness of 0.5 mm, and its contour is an exact one-to-one copy of the contour of the 3D glass cover plate 2 and the hot bending male die 102. The position corresponding to the camera hole 201 on the acrylic plate 4 is a through hole, and the hole diameter is enlarged by 0.1 mm based on the hole diameter of the product camera hole 201. The hole is tapered 30° in the upward surface direction.

[0042] S4: Clamp the hot bending male die 102 obtained in step S3 onto the processing device, and use a nylon brush 3 and diamond grinding paste to process the position of the camera hole 201 of the hot bending male die 102. Specifically: the diameter of the brush 3 is 10 mm, the hair length is 10 mm, and the hair thickness is 0.1 mm. Add 2000-mesh diamond grinding paste during the processing. The brush 3 presses 2 mm over the die surface, the rotation speed is 200 r / min, and the processing time is 240 s to process a circular concave pit 103 with a depth of 0.006 mm.

[0043] Among them, the processing device used is the same as that in Embodiment 1, and details are not described herein again.

[0044] The dimensions of the position of the camera hole 201 of the hot bending molds prepared in Example 1 and Comparative Examples 1-2 were measured respectively. Specifically: A coordinate measuring machine was used to measure the depth drop dimension of the machining position of the camera hole 201. Taking the four quadrant points at equal intervals on the edge of the circular pit 103 at the camera hole 201 as the origin, moving 0.5 mm in the direction of the center of the circle, four measurement points d1 - d4 were obtained respectively; taking the four quadrant points at equal intervals on the edge of the circular pit 103 at the camera hole 201 as the origin, moving 0.5 mm in the direction away from the center of the circle, four measurement reference points D1 - D4 were obtained respectively. The deviation of the measured values of the four measurement points d1 - d4 relative to the four measurement reference points D1 - D4 in the Z direction was the depth drop dimension of the machining position of the camera hole 201. The average value of the four points was taken, and the measurement results are shown in Table 1:

[0045] Table 1

[0046]

[0047] In Table 1, the unit is mm.

[0048] After obtaining the above data, hot bending forming tests were carried out on the hot bending molds prepared in Example 1 and Comparative Examples 1-2 respectively. A large number of 3D glass cover plate 2 formed products were repeatedly prepared using them, and 50 formed products were randomly selected from the formed products of the hot bending molds prepared in Example 1 and Comparative Examples 1-2 respectively, and the interference fringe tests of the camera hole 201 were carried out on the selected formed products. The specific operation of the interference fringe test was as follows: The test equipment used was a laser interferometer of the Interferometer Hi-Smarc-lll-Po model. The test standard was that the interference fringes ≤ 3. The test area was the same as the diameter of the camera hole 201. The test results are shown in Table 2:

[0049] Table 2

[0050]

[0051] As can be seen from the data in Table 1, the machining depth ranges of the hot bending molds prepared in Example 1 and Comparative Examples 1-2 at the position of the camera hole 201 are as follows: the depth of the circular pit 103 in Example 1 is between 0.002 - 0.004 mm; there is no circular pit 103 in Comparative Example 1, and the depth is basically 0; the depth of the circular pit 103 in Comparative Example 2 is between 0.005 - 0.007 mm. Further combining the data in Table 2, it can be seen that the yield rate of the molded products produced by the hot bending mold of Example 1, which is machined at the position of the camera hole 201 of the hot bending mold with a machining depth of 0.002 - 0.004 mm, is the best. The yield rate of the molded products produced by the mold of Comparative Example 1, where the corresponding product camera hole 201 position of the hot bending mold is not machined, is the worst. And the yield rate of the molded products produced by the mold of Comparative Example 2, where the camera hole 201 position of the hot bending mold is machined but the machining depth is between 0.005 - 0.007 mm, decreases compared with Example 1.

[0052] In summary, the present invention processes the hot bending mold of the 3D glass cover plate 2, and a circular pit 103 with an appropriate depth is machined at the position of the product camera hole 201, which can locally avoid the space between the product and the hot bending mold during the hot bending process, reduce the local transfer pressure, and thus improve the surface accuracy of the position of the camera hole 201 of the 3D glass cover plate 2. By this method, the problems of interference fringes and poor PV value caused by poor surface accuracy of the camera hole 201 of the 3D glass cover plate 2 can be solved in the hot bending process at the source, and the generation of defective products after the polishing process and the secondary repair of defective products can be reduced.

[0053] Although the present invention has been described in detail by referring to the accompanying drawings and in combination with the preferred embodiments, the present invention is not limited thereto. Without departing from the spirit and essence of the present invention, those of ordinary skill in the art can make various equivalent modifications or substitutions to the embodiments of the present invention, and these modifications or substitutions should all be within the scope covered by the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. Method for improving interference fringes and PV value defects of camera holes in 3D glass covers, characterized in that, Including the following steps: S1 Install a concave masking fixture on the forming surface of the hot bending female die (101) of the processed 3D glass cover plate (2). S2 Use a brush (3) and abrasive paste to polish the position of the camera hole (201) on the hot bending female die (101) in step S1 to process a circular concave pit (103). S3 Install a convex masking fixture on the forming surface of the hot bending male die (102) of the processed 3D glass cover plate (2). S4 Use a brush (3) and abrasive paste to polish the position of the camera hole (201) on the hot bending male die (102) in step S3 to process a circular concave pit (103). The depth of the circular concave pit (103) is 0.002 - 0.004 mm.

2. The method for improving the interference fringes and poor PV value of the camera hole of the 3D glass cover plate according to claim 1, characterized in that, The hot bending female die (101) and the hot bending male die (102) are graphite molds.

3. The method for improving the interference fringes and poor PV value of the camera hole of the 3D glass cover plate according to claim 1, wherein The concave masking fixture and the convex masking fixture are made of acrylic plates (4), and their contours are respectively in one-to-one imitation of the contours of the hot bending female die (101) and the hot bending male die (102). Through holes are provided at the positions corresponding to the camera holes (201) on the concave masking fixture and the convex masking fixture. The aperture of the through hole is enlarged by 0.1 - 0.12 mm based on the aperture of the camera hole (201) of the 3D glass cover plate (2), and the hole is tapered 28° - 30° in the upward surface direction.

4. The method for improving the interference fringes and poor PV value of the camera hole of the 3D glass cover plate according to claim 3, wherein The thickness of the acrylic plate (4) is 0.5 - 0.6 mm.

5. The method for improving the interference fringes and poor PV value of the camera hole of the 3D glass cover plate as described in claim 1, wherein, In steps S2 and S4, a processing device is used to polish the hot bending female die (101) and the hot bending male die (102). The processing device includes a workbench (501). The hot bending female die (101) and the hot bending male die (102) are detachably fixed on the workbench (501). The workbench (501) is arranged on the slider of the first ball screw. The first ball screw is arranged on the slider of the second ball screw (the second ball screw is 504). The first ball screw and the second ball screw (504) respectively drive the workbench (501) to move in the X direction and the Y direction. A bracket (508) is arranged on one side of the workbench (501). A hydraulic cylinder (509) is installed on the bracket (508). The piston rod of the hydraulic cylinder (509) faces downward and is connected to a motor (511). The output shaft of the motor (511) is connected to a brush (3), and the brush (3) is located above the workbench (501).

6. The method for improving the interference fringes and poor PV value of the camera hole of the 3D glass cover plate according to claim 1, wherein, The brush (3) is a nylon brush (3), with a diameter of 10 - 12 mm, a hair length of 10 - 12 mm, and a hair thickness of 0.1 - 0.12 mm.

7. The method for improving the interference fringes and poor PV value of the camera hole of the 3D glass cover plate according to claim 1, wherein, The abrasive paste is 1800 - 2000 - mesh diamond abrasive paste.

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