Glass plate manufacturing method and scribing device
By controlling the pressure change of the scribing head in the manufacturing of glass plates, the initial, fixed pressure and disengagement of the scribing line are formed, and the problems of angular defects and low productivity in the prior art are solved, and efficient manufacturing of the curved glass plate is achieved. method.
Patent Information
- Application Number
- CN202380044430.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2022-06-10
- Filing Date
- 2023-05-26
- Publication Date
- 2024-12-31
AI Technical Summary
In the prior art, when manufacturing glass plates with curved portions, problems such as angular cut-off portions and low productivity are easily arisen, and the pressing pressure of the scribe head is not effectively controlled.
By adopting a glass plate manufacturing method, the fixed pressure scribing process is performed on the mother glass plate with a constant target pressing pressure, and the initial pressing pressure larger than the target pressing pressure is used in the initial cutting process, so that the cutting head is made from The starting point is traveled to the end point, forming an initial scribing line, which is then converted into a fixed pressure scribing process. Finally, at the end point, a large pressing pressure is used to detach the scribing line, and the pressure change of the scribing head is controlled to suppress the occurrence of angular defects.
The occurrence of angular defects is effectively suppressed, productivity is improved, and glass plates with curved portions can be efficiently manufactured.
Smart Images
Figure CN119233952A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a method for manufacturing a glass plate and a scoring device, and in particular, to a method for manufacturing a glass plate having a curved portion as a contour shape and a scoring device used in the manufacturing method. Background Art
[0002] In recent years, a plate-shaped glass sheet having a circular outline shape, i.e., a disc-shaped glass sheet, has been used in various applications. As a method for obtaining such a disc-shaped glass, a method is known in which a scoring line along a desired outline shape is formed on a mother glass sheet and glass is cut out along the scoring line (e.g., Patent Document 1).
[0003] Prior art literature
[0004] Patent Literature
[0005] Patent Document 1: Japanese Patent Application Publication No. 2020-117434 Summary of the invention
[0006] Problems that the invention will solve
[0007] However, the technology of Reference 1 does not conduct detailed research on the control of the pressing force of the scribing head when forming the scribing line. Therefore, when cutting out the glass sheet, a problem such as an angular cut-off portion is easily generated at the starting point (and end point) of the scribing line. That is, the conventional technology cannot suppress the occurrence of defects, and there is still room for improvement in terms of productivity.
[0008] An object of the present invention is to provide a method for manufacturing a glass plate and a scribing device capable of suppressing the above-mentioned corner defects and manufacturing a glass plate having a curved portion with high productivity.
[0009] Solutions to Solve Problems
[0010] The first invention of the glass plate manufacturing method of the present invention is a glass plate manufacturing method, which is cut out from a mother glass plate to obtain a glass plate having a curved portion in at least a part of the contour shape, characterized in that the glass plate manufacturing method includes: a scoring step, in which a scoring head is pressed and moved on the main surface of the mother glass plate in a manner of describing the contour shape of the glass plate from a starting point located on the curved portion to an end point that is at the same position as the starting point to form a scoring line; and a cutting step, in which stress is applied to the mother glass plate after the scoring step to cut the glass plate along the scoring line, the scoring step including: a constant pressure scoring step, in which the scoring head is pressed and moved at a constant target pressing force; and an initial scoring step, in which the scoring head is pressed and moved at an initial pressing force greater than the target pressing force from the start time of the scoring head movement to the transfer to the constant pressure scoring step.
[0011] As a second invention, in the first invention, preferably, the initial pressing force is 1.5 times or more the target pressing force.
[0012] As a third invention, in the first or second invention, preferably, the initial travel distance as the travel distance of the scribing head in the initial scribing step is 1 / 40 to 1 / 30 of the constant-pressure travel distance as the travel distance of the scribing head in the constant-pressure scribing step.
[0013] As a fourth invention, in any one of the first to third inventions, it is preferred that the outline shape of the glass plate is a circle with a diameter of 10 to 1000 mm.
[0014] As a fifth invention, in any one of the first to fourth inventions, preferably, the thickness of the mother glass sheet is 0.3 mm or less.
[0015] As a sixth invention, in any one of the first to fifth inventions, preferably, the scribing step further includes a detaching scribing step of moving the scribing head from an end point to an edge portion of the mother glass sheet after the constant pressure scribing step.
[0016] As a seventh invention, in any one of the first to sixth inventions, preferably, in the release scribing step, the scribing head is moved with a release pressing force greater than a target pressing force.
[0017] The scoring device of the present invention scores the contour shape of a glass plate having a curved portion in at least a portion thereof on a mother glass plate, and is characterized in that the scoring device comprises: a scoring mechanism that forms a scoring line by pressing a scoring head and moving it on the main surface of the mother glass plate from a starting point located on the curved portion to an end point that is at the same position as the starting point in a manner that depicts the contour shape of the glass plate; and a control mechanism that causes the scoring mechanism to execute a constant-pressure scoring process and an initial scoring process, wherein the constant-pressure scoring process moves the scoring head while pressing the scoring head with a constant target pressing force, and the initial scoring process moves the scoring head while pressing the scoring head with an initial pressing force greater than the target pressing force from the start time of the scoring head movement until the time when the constant-pressure scoring process is transferred to the constant-pressure scoring process.
[0018] Effects of the Invention
[0019] According to the present invention, a glass sheet having a curved portion can be manufactured with high productivity compared to the conventional art. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 This is a schematic diagram showing a state in which a scribed line is formed in the method for manufacturing a glass plate according to the embodiment of the present invention.
[0021] Figure 2This is a flowchart showing an outline of the method for producing a glass plate according to the embodiment of the present invention.
[0022] Figure 3 This is a graph showing changes in the pressing force of the scribe head in the method for producing a glass plate according to the embodiment of the present invention. DETAILED DESCRIPTION
[0023] Hereinafter, a method for manufacturing the glass plate 1 according to the embodiment of the present invention will be described. Figure 1 This is a schematic diagram showing a state in which a scribed line T is formed in the method for manufacturing a glass plate according to the embodiment of the present invention. Figure 2 1 is a flowchart showing an outline of a method for manufacturing a glass plate 1 according to an embodiment of the present invention. Figure 2 As shown, the method for manufacturing a glass plate of the present invention includes a scribing step S1 and a cutting step S2.
[0024] The scribing step S1 is a step of pressing the scribing head 20 and moving the scribing head 20 on the main surface of the mother glass plate 10 in a manner of drawing the contour shape of the glass plate 1, thereby forming a scribing line T. The scribing line T is a scribing groove that becomes the starting point of a crack generated when the mother glass plate 10 is cut. The scribing line T includes an initial scribing line T1, a constant pressure scribing line T2, and a separation scribing line T3.
[0025] like Figure 1 As shown in the figure, the glass plate 1 is a plate-shaped or sheet-shaped glass having a curved portion as a contour shape at least in a part. In this embodiment, the glass plate 1 is exemplified as a disk-shaped glass plate having a flat circular contour shape, that is, a case where the contour shape is entirely composed of curves. The diameter of the glass plate 1 can be arbitrarily set according to the application, but is, for example, 10 mm or more and 1000 mm or less, preferably 50 mm or more and 800 mm or less, and more preferably 100 mm or more and 600 mm or less.
[0026] The mother glass plate 10 is a plate-shaped glass from which the glass plate 1 can be cut. In other words, the mother glass plate 10 is a glass having a shape larger than the glass plate 1 and capable of including the outer shape of the glass plate 1. In this embodiment, the mother glass plate 10 has a planar rectangular shape.
[0027] The thickness t of the glass plate 1 and the mother glass plate 10 can be arbitrarily set within the range of 0.3 mm (300 μm) or less, and is preferably 10 μm to 200 μm, preferably 20 μm to 150 μm, and more preferably 30 μm to 80 μm.
[0028] The glass plate 1 and the mother glass plate 10 are, for example, alkali-free glass or alkali-aluminosilicate glass.
[0029] When the glass plate 1 and the mother glass plate 10 are alkali-free glass, the glass composition preferably has the following composition. The glass plate 1 and the mother glass plate 10 contain, for example, 60 to 75% SiO2, 5 to 20% Al2O3, 0 to 15% B2O3, 0 to 1% Li2O+Na2O+K2O (the total amount of Li2O, Na2O and K2O) or more and less than 1%, 0 to 10% MgO, 0 to 15% CaO, 0 to 10% SrO, and 0 to 10% BaO in terms of mol%. If such a glass composition is used, low expansion and high durability can be obtained in the glass plate 1, which is particularly suitable for display applications, photovoltaic panels, etc.
[0030] When the glass plate 1 and the mother glass plate 10 are alkali aluminosilicate glass, the glass composition preferably has the following composition. The glass plate 1 and the mother glass plate 10 contain, for example, 40 to 80% SiO2, 1 to 25% Al2O3, 0 to 30% B2O3, 0 to 20% Li2O, 1 to 25% Na2O, and 0 to 10% K2O in terms of mol%. If such a glass composition is used, the glass plate 1 can be easily processed into chemically strengthened glass by ion exchange to obtain high strength characteristics, which is particularly suitable for mobile display applications, touch panel display applications, etc.
[0031] The mother glass plate 10 is obtained by, for example, obtaining a plate-shaped or sheet-shaped mother glass obtained by a forming method such as overflow down-drawing, slot down-drawing, float method, or redrawing method as it is or cutting it into small pieces and processing it. In order to obtain a smooth surface, the overflow down-drawing method is preferably used as a forming method.
[0032] The scribing head 20 is a sharp hard member capable of forming a scribing line T on the mother glass plate 10. The scribing head 20 is typically a diamond indenter, but a known member capable of being used for scribing glass, such as a wheel-shaped blade, may be used. The scribing head 20 is mounted on a scribing device (not shown) and moves on the main surface of the mother glass plate 10 while being pressed against the mother glass plate 10 to scribing. The scribing device includes a mechanism such as an actuator configured to control the pressing force of the scribing head 20 and to support and move the scribing head 20.
[0033] like Figure 2 As shown, the scribing process S1 includes an initial scribing process S11, a constant pressure scribing process S12, and a release scribing process S13. In the scribing process S1, first, the initial scribing process S11 is performed.
[0034] The initial scribing step S11 is a step for forming an initial scribing line T1. Figure 1 As shown by the dotted line in the figure, it is formed from the starting point A to the interval point B. Figure 3As shown, the scribing head 20 is pressed with an initial pressing force Ps from the starting point A to the interval point B, i.e., during the formation of the initial scribing line T1. The initial pressing force Ps is a pressing force greater than the target pressing force Pt described later. The initial pressing force Ps is preferably 1.5 times or more of the target pressing force Pt. Figure 3 2 is a graph showing changes in the pressing force applied to the scribing head 20. Figure 3 In FIG. 1 , the vertical axis shows the pressing force applied to the scribing head 20 , and the horizontal axis shows the travel distance (travel position) of the scribing head 20 .
[0035] When the processing of the initial scribing step S11 is completed, the processing of the constant-pressure scribing step S12 is then performed.
[0036] The constant pressure scribing step S12 is a step for forming a constant pressure scribing line T2. Figure 1 As shown by the single-point dashed line in FIG. 1 , the initial scoring line T1 and the constant-pressure scoring line T2 are formed from the interval point B to the end point C. The end point C is set to be substantially the same position as the starting point A. Thus, the initial scoring line T1 and the constant-pressure scoring line T2 are formed as closed curves showing the contour of the glass plate 1 or closed frame lines including a straight line in part. Figure 3 As shown, the scribing head 20 is pressed with a constant target pressing force Pt during the period from the interval point B to the end point C, i.e., during the period of forming the constant pressure scribing line T2. The target pressing force Pt is set to a value smaller than the initial pressing force Ps. The target pressing force Pt can be set to form the scribing line T at a depth that is easy to cut out the glass plate 1 according to the characteristics (hardness, thickness) of the mother glass plate 10 and the characteristics (hardness, shape) of the scribing head 20.
[0037] It should be noted that the initial travel distance L1 (i.e., the length of the initial scoring line T1) as the travel distance of the scoring head 20 in the above-mentioned initial scoring process S11 is preferably shorter than the constant pressure travel distance L2 (i.e., the length of the constant pressure scoring line T2) as the travel distance of the scoring head 20 in the constant pressure scoring process S12. Specifically, the travel distance L1 is preferably 1 / 40 to 1 / 30 of the travel distance L2. In addition, the position of the interval point B is preferably set within a range that satisfies the above-mentioned travel distance condition. In this way, by scoring with a larger pressing force over an initial shorter distance, the crack can be reliably made to progress along the thickness direction of the mother glass plate 10 near the starting point A (and the end point C), and the generation of angular defects when the glass plate 1 is cut out can be suppressed.
[0038] When the process of the constant-pressure scribing step S12 is completed, the process of the release scribing step S13 is then performed.
[0039] The separation scribing step S13 is a step for forming a separation scribing line T3. Figure 1As shown by the solid line of , the glass edge portion D is formed from the end point C to the glass edge portion D. The glass edge portion D is set at an arbitrary position of the edge portion of the mother glass plate 10. The glass edge portion D is preferably set at a position where the distance to the edge of the mother glass plate 10 is the shortest and the separation score line T3 is substantially perpendicular to the end side of the mother glass plate 10. By forming the separation score line T3 in this way, it is easy to cut the glass plate 1 from the mother glass plate 10 in the cutting process S2 described later. Figure 3 As shown, the scoring head 20 is preferably pressed with a detachment pressing force Pe in the initial stage of forming the detachment scoring line T3 from the end point C. The detachment pressing force Pe is preferably set to a value greater than the target pressing force Pt. In addition, the detachment pressing force Pe can be set to a value smaller than the initial pressing force Ps. In this way, by scoring with a larger pressing force in the initial stage of forming the detachment scoring line T3, the direction of the scoring head 20 can be easily switched, thereby suppressing the occurrence of defects in the glass plate 1. It should be noted that in the process of forming the detachment scoring line T3, the pressing force of the scoring head 20 is preferably decreased from the detachment pressing force Pe to the target pressing force Pt.
[0040] When the process of the separation scribing step S13 is completed, the process of the cutting step S2 is then performed.
[0041] The cutting process S2 is a process of applying stress to the mother glass plate 10 to cause cracks to develop along the score lines T (initial score line T1, constant pressure score line T2, and separation score line T3) and cut out the glass plate 1. Specifically, a portion of the mother glass plate 10 that does not constitute the glass plate 1 (hereinafter referred to as the unnecessary portion 2) is held, and a bending load is applied to impart bending stress, and cracks are advanced along the score lines T, thereby separating the mother glass plate 10 into the glass plate 1 and the unnecessary portion 2. The application of stress may be performed automatically using a device capable of holding and deforming the mother glass plate 10, or may be performed by an operator holding the mother glass plate 10 and performing a bending operation.
[0042] According to the above-described method for manufacturing a glass plate, by appropriately controlling the pressing force of the scribing head 20 , the occurrence of angular defects that may occur when cutting out the glass plate 1 having a curved portion as an outline can be suppressed, and the glass plate 1 can be manufactured with high productivity.
[0043] The processing of the scribing step S1 described above can be executed by a scribing device that can control the pressing force of the scribing head 20 and includes a controller storing a program for controlling the scribing step S1 as described above.
[0044] The glass plate 1 obtained by the manufacturing method of the glass plate of the present invention can be used as a display device such as a smart phone, a mobile phone, a tablet computer, a personal computer, a digital camera, a touch panel display, a vehicle-mounted display device, a vehicle-mounted panel, etc., a power generation panel, other optical devices, etc., a substrate for semiconductor manufacturing, other supporting substrates, etc. In addition, when the glass plate 1 is used for these purposes, it can be laminated with any plate-shaped or sheet-shaped resin material or metal material via an adhesive, an adhesive sheet, etc. and used as a laminate.
[0045] (Variation)
[0046] In the above embodiment, the case where the contour shape of the glass plate 1 when viewed in the thickness direction is a perfect circle is exemplified, but the shape of the glass plate 1 is not limited to this, and can be any shape as long as at least a part of the contour shape has a curved portion. For example, the contour shape of the glass plate 1 may be an ellipse, or may be a shape with a notch (cutout) or an orientation flat surface in a part of the perfect circle.
[0047] The mother glass plate 10 may have any shape as long as the glass plate 1 can be cut out, and may have a disk shape, for example.
[0048] In the above embodiment, the case where the glass plate 1 is a flat plate is described as an example, but the glass plate 1 of the present invention can also be given a curved surface shape as a three-dimensional shape as needed, and a concave-convex shape can be given partially or entirely in the area other than the bendable portion. In addition, through holes, cutouts, etc. can also be formed in the glass plate 1.
[0049] In the above embodiment, the case where the separation score line T3 is included in the score line T is exemplified, but as long as the glass plate 1 can be cut out from the mother glass plate 10 in a hollowed-out manner, it is also possible to omit the separation score line S13 and not form the separation score line T3. That is, in the present invention, the score line T only needs to include the initial score line T1 and the constant pressure score line T2. In addition, in order to facilitate cutting of the glass plate 1 from the mother glass plate 10, a plurality of separation score lines T3 may be formed.
[0050] Industrial Applicability
[0051] The method for producing a glass plate of the present invention can be used as a method for producing a glass plate used as, for example, a smartphone, a mobile phone, a tablet computer, a personal computer, a digital camera, a touch panel display, a vehicle-mounted display device, a display device such as a vehicle-mounted panel, a power generation panel, other optical devices, a substrate for semiconductor manufacturing, other supporting substrates, and the like.
[0052] Description of Reference Numerals
[0053] 1 Glass Pane
[0054] 10 Mother glass plate
[0055] 20 Scratching head
[0056] T1 Initial scoring line
[0057] T2 Constant Pressure Score Line
[0058] T3 Break away from the score line
[0059] Ps Initial pressing force
[0060] Pt Target pressure
[0061] Pe Breakaway pressure
[0062] L1 Initial travel distance
[0063] L2 Constant pressure travel distance.
Claims
1. A method for producing a glass plate, wherein a glass plate having a curved portion in at least a part of its outline shape is obtained by cutting out the glass plate from a mother glass plate, wherein: The method for manufacturing the glass sheet comprises: a scribing step of forming a scribing line by moving a scribing head while pressing the scribing head on the main surface of the mother glass sheet so as to trace the contour shape of the glass sheet from a starting point located on the curved portion to an end point located at the same position as the starting point; and a cutting process, applying stress to the mother glass sheet after the scribing process so as to cut out the glass sheet along the scribing line, The scribing process comprises: a constant pressure scribing step of advancing the scribing head while pressing the scribing head at a constant target pressing force; and The initial scribing step is to advance the scribing head while pressing the scribing head with an initial pressing force greater than the target pressing force, from the start of the advancement of the scribing head until the transition to the constant-pressure scribing step.
2. The method for manufacturing a glass plate according to claim 1, wherein: The initial pressing force is greater than or equal to 1.5 times the target pressing force.
3. The method for producing a glass plate according to claim 1 or 2, wherein: The initial travel distance, which is the travel distance of the scribing head in the initial scribing step, is 1 / 40 to 1 / 30 of the constant-pressure travel distance, which is the travel distance of the scribing head in the constant-pressure scribing step.
4. The method for producing a glass plate according to claim 1 or 2, wherein: The outline shape of the glass plate is a circle with a diameter of 10 to 1000 mm.
5. The method for producing a glass plate according to claim 1 or 2, wherein: The thickness of the mother glass plate is less than 0.3 mm.
6. The method for manufacturing a glass plate according to claim 1 or 2, wherein: The scribing step further includes a separation scribing step of moving the scribing head from the end point to an edge portion of the mother glass sheet after the constant pressure scribing step.
7. The method for manufacturing a glass plate according to claim 6, wherein: In the detachment scribing step, the scribing head is moved with a detachment pressing force greater than the target pressing force.
8. A scribing device for scribing a contour shape of a glass plate having at least a portion of a curved portion on a mother glass plate, wherein: The scribing device comprises: a scribing mechanism for forming a scribing line by moving a scribing head while pressing the scribing head on the main surface of the mother glass sheet in a manner that traces the contour shape of the glass sheet, from a starting point located on the curved portion to an end point located at the same position as the starting point; as well as A control mechanism causes the scratching mechanism to execute a constant-pressure scratching process and an initial scratching process, wherein the constant-pressure scratching process causes the scratching head to move while pressing the scratching head with a constant target pressing force, and the initial scratching process causes the scratching head to move while pressing the scratching head with an initial pressing force greater than the target pressing force from the start time of the movement of the scratching head to the transfer to the constant-pressure scratching process.