CN115427363A - Method for producing glass plate, apparatus for producing glass plate, and glass plate - Google Patents
Method for producing glass plate, apparatus for producing glass plate, and glass plate Download PDFInfo
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- CN115427363A CN115427363A CN202180028435.5A CN202180028435A CN115427363A CN 115427363 A CN115427363 A CN 115427363A CN 202180028435 A CN202180028435 A CN 202180028435A CN 115427363 A CN115427363 A CN 115427363A
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- 239000011521 glass Substances 0.000 title claims abstract description 274
- 238000004519 manufacturing process Methods 0.000 title claims description 41
- 238000000034 method Methods 0.000 claims description 29
- 238000003825 pressing Methods 0.000 claims description 6
- 230000007246 mechanism Effects 0.000 description 47
- 238000005520 cutting process Methods 0.000 description 12
- 230000002093 peripheral effect Effects 0.000 description 7
- 238000005452 bending Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 210000000078 claw Anatomy 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 238000003280 down draw process Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000007500 overflow downdraw method Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000009751 slip forming Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B33/00—Severing cooled glass
- C03B33/02—Cutting or splitting sheet glass or ribbons; Apparatus or machines therefor
- C03B33/0215—Cutting or splitting sheet glass or ribbons; Apparatus or machines therefor the ribbon being in a substantially vertical plane
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
- B26F3/00—Severing by means other than cutting; Apparatus therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28D—WORKING STONE OR STONE-LIKE MATERIALS
- B28D5/00—Fine working of gems, jewels, crystals, e.g. of semiconductor material; apparatus or devices therefor
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B17/00—Forming molten glass by flowing-out, pushing-out, extruding or drawing downwardly or laterally from forming slits or by overflowing over lips
- C03B17/06—Forming glass sheets
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B17/00—Forming molten glass by flowing-out, pushing-out, extruding or drawing downwardly or laterally from forming slits or by overflowing over lips
- C03B17/06—Forming glass sheets
- C03B17/064—Forming glass sheets by the overflow downdraw fusion process; Isopipes therefor
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B17/00—Forming molten glass by flowing-out, pushing-out, extruding or drawing downwardly or laterally from forming slits or by overflowing over lips
- C03B17/06—Forming glass sheets
- C03B17/068—Means for providing the drawing force, e.g. traction or draw rollers
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B33/00—Severing cooled glass
- C03B33/02—Cutting or splitting sheet glass or ribbons; Apparatus or machines therefor
- C03B33/023—Cutting or splitting sheet glass or ribbons; Apparatus or machines therefor the sheet or ribbon being in a horizontal position
- C03B33/033—Apparatus for opening score lines in glass sheets
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
- Y02P40/57—Improving the yield, e-g- reduction of reject rates
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Forests & Forestry (AREA)
- Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)
- Processing Of Stones Or Stones Resemblance Materials (AREA)
Abstract
When a glass sheet (2 y) is cut out from the glass ribbon (2) by bringing the breaking bar (5) into contact with the glass ribbon (2) moving downward in the vertical posture and breaking the glass ribbon (2) along a score line (3) extending in the width direction of the glass ribbon (2), the glass ribbon (2) having a curved shape that is convex to one side along the width direction is brought into contact with an abutting side end (5 a) of the breaking bar (5) having a curved shape that is convex to the same side as the glass ribbon (2) along the width direction, and the glass ribbon (2) is broken along the score line (3).
Description
Technical Field
The present invention relates to a glass sheet manufacturing method for cutting a glass sheet from a glass ribbon by breaking the glass ribbon moving downward in a vertical posture along a score line extending in a width direction of the glass ribbon, a glass sheet manufacturing apparatus, and a cut glass sheet.
Background
As is well known, in the field of glass sheet production, a process of cutting a glass sheet from a glass ribbon continuously formed by a down-draw method or the like and moving downward in a vertical posture is performed. As a specific example of the method and apparatus for producing a glass plate in this manner, patent document 1 discloses an example.
The device disclosed in this document comprises: a scoring mechanism that forms a score line on the glass ribbon moving downward in a longitudinal posture; a breaking lever (in this document, a fulcrum lever) that is pressed against a scribe line forming region of the glass ribbon; and a support mechanism (breaking arm in this document) that supports a portion to be cut that is present below the scribe line of the glass ribbon. In the method disclosed in the publication for cutting out a glass sheet using this apparatus, after a score line is formed in the width direction on the glass ribbon by the scoring mechanism, first, the breaking bar is pressed against the score line forming region of the glass ribbon. Next, the supporting mechanism in a state of supporting the portion to be cut of the glass ribbon is operated, and the glass ribbon is bent in the longitudinal direction with the breaking lever as a fulcrum, so that the glass ribbon is broken along the scribing line, and a glass plate is cut from the glass ribbon.
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open publication No. 2018-90446
Disclosure of Invention
Problems to be solved by the invention
According to patent document 1, only bending the glass ribbon in the longitudinal direction is disclosed as a bending mode of the glass ribbon when the glass ribbon is broken along the scribe line. Therefore, according to the breaking method disclosed in this publication, the following problems occur.
That is, the support mechanism disclosed in this publication supports only both ends of the glass ribbon in the width direction. In this support system, the central portion of the glass ribbon in the width direction is not restrained, and the glass ribbon is bent in the width direction. This situation becomes remarkable when the glass ribbon is thin.
When the glass ribbon is bent in the width direction in this manner, if the glass ribbon is broken using the conventional breaking bar, the glass ribbon cannot be appropriately broken along the scribe line. As a result, many breakage and cutting errors occur, which may cause a reduction in quality of the cut glass sheet and a deterioration in product yield.
From the above-described viewpoint, an object of the present invention is to improve the quality of a cut glass sheet and the yield of products by appropriately breaking the glass sheet without causing breakage or cutting errors.
Means for solving the problems
A first aspect of the present invention made to solve the above problems is a method for manufacturing a glass sheet by bringing a breaking bar into contact with a glass ribbon moving downward in a vertical posture and breaking the glass ribbon along a scribe line extending in a width direction of the glass ribbon to cut a glass sheet from the glass ribbon, wherein the glass ribbon having a curved shape protruding to one side in the width direction is brought into contact with an abutting side end portion of the breaking bar having a curved shape protruding to the same side as the glass ribbon in the width direction, and the glass ribbon is broken along the scribe line.
According to this method, when the glass ribbon having a shape in the width direction that is a curved shape that is convex to one side is to be broken, a breaking bar having an abutting side end portion having a shape in the width direction that is a curved shape that is convex to the same side as the glass ribbon is used. Therefore, it is possible to suppress the occurrence of a breakage or a cutting error when the glass ribbon bent in the width direction is broken by the breaking rod. As a result, the quality of the cut glass sheet is improved and the yield of the product is improved.
In this method, the contact-side end portion of the breaking bar may be brought into contact with the glass ribbon by touching, in a state where the region of the glass ribbon where the scribe line is formed is bent in the longitudinal direction.
In this way, since the breaking is completed at the time point when the abutment side end portion of the breaking rod is brought into contact with the glass ribbon, variation or variation in time required for breaking is reduced, and the production interval time is also shortened.
In this method, it is preferable that, when the contact-side end portion of the breaking rod is brought into contact with the glass ribbon by touching, the widthwise central portion of the contact-side end portion is brought into contact before the other portions.
In this way, when the abutment-side end portion of the breaking bar contacts the glass ribbon, the crack smoothly extends from the widthwise central portion of the scribe line toward the widthwise both end portions, and therefore high-quality breaking can be performed. If the portion of the abutting side end of the breaking bar that is offset from the widthwise central portion is caused to contact the glass ribbon prior to other portions, the crack progresses from a portion other than the widthwise central portion of the score line, and therefore smooth crack progression is hindered, which becomes an important factor for the occurrence of breakage or cutting errors. According to the method, such a problem is not likely to occur.
In the above method, the break bar may be divided into a plurality of break bar members in the width direction, and adjacent ones of the plurality of break bar members may be connected so that an angle formed by the adjacent two break bar members in the width direction can be adjusted.
In this way, by adjusting the angle in the width direction formed by the adjacent breaking bars, the curvature of the curved shape (macroscopic curved shape) of the contact side end portion in the width direction can be changed. Here, the bent shape of the glass ribbon in the width direction varies depending on the width-direction size and thickness of the glass ribbon. The curved shape of the contact side end portion in the width direction can be made to appropriately follow such a change.
In this method, the breaking bar may be divided into two breaking bar members in the width direction, and the two breaking bar members may be connected at a widthwise central position of the breaking bar.
In this way, the curvature of the curved shape of the contact-side end portion of the breaking rod along the width direction can be changed with a simple operation. Further, since the two break bar members are connected at the widthwise central position of the break bar, the shape of the contact-side end portion of the break bar along the widthwise direction can be a curved shape symmetrical on both sides thereof with respect to the widthwise central position.
In these methods, the contact-side end portion of the breaking bar may be brought into contact with the glass ribbon so that a pressing force greater than that applied to both sides of the glass ribbon in the width direction acts on the center portion of the glass ribbon in the width direction, and a crack may be caused to progress toward both ends of the glass ribbon in the width direction from the center portion of the score line in the width direction, thereby breaking the glass ribbon.
In this way, when the glass ribbon is broken, a relatively large pressing force acts on the widthwise central portion of the glass ribbon, and a starting point of crack development is formed in the widthwise central portion of the score line in association therewith. Therefore, the crack smoothly progresses from the starting point of the widthwise central portion of the scribe line to both widthwise end portions, and high-quality breaking is performed.
A second aspect of the present invention made to solve the above problems is a glass sheet manufacturing apparatus configured to cut a glass sheet from a glass ribbon by bringing a breaking bar into contact with the glass ribbon moving downward in a vertical posture and breaking the glass ribbon along a score line extending in a width direction of the glass ribbon, wherein the glass ribbon is configured to be broken along the score line by bringing the glass ribbon in a shape of a curve protruding to one side in the width direction into contact with an abutting side end portion of the breaking bar in a shape of a curve protruding to the same side as the glass ribbon in the width direction.
According to this embodiment, the same operational effects as those of the above-described manufacturing method having substantially the same configuration as that of the manufacturing apparatus can be obtained.
A third aspect of the present invention made to solve the above problems is a glass plate having a rectangular shape with four sides, wherein one of the four sides orthogonal to a pulling direction or two sides parallel to the pulling direction has a crack origin within a range of 10% of a total length in a longitudinal direction from a center point in the longitudinal direction toward both sides in the longitudinal direction. Here, the origin of the crack is referred to as a fracture origin of the crack.
According to this configuration, since the crack origin exists within a predetermined range in the longitudinal direction central portion of the edge of the glass sheet, the crack progresses from the width direction central portion of the glass ribbon toward the width direction both end portions when the glass ribbon is broken. That is, a starting point (crack origin) of crack propagation is formed in the central portion in the width direction of the glass ribbon, and the crack smoothly progresses toward both end portions in the width direction with the starting point as a starting point. Therefore, the glass sheet is properly cut, adhesion of glass powder to the glass sheet due to cutting failure or the like is prevented, and high quality is achieved. Further, according to this glass sheet, since the starting point of the crack progress can be grasped by the origin of the crack, the starting point can be adjusted such that the starting point is further moved toward the center in the width direction when the glass ribbon is broken.
Effects of the invention
According to the present invention, even in a state where the glass ribbon is bent in the width direction, the glass ribbon can be appropriately broken without causing a crack or a cutting error, and the quality of a cut glass plate can be improved and the yield of products can be improved.
Drawings
Fig. 1 is a side view showing a schematic configuration of a glass plate manufacturing apparatus according to an embodiment of the present invention.
Fig. 2 is a front view (a front view as viewed along arrow X in fig. 1) showing a schematic configuration of a glass plate manufacturing apparatus according to an embodiment of the present invention.
Fig. 3 is a cross-sectional plan view taken along the line Y-Y of fig. 2.
Fig. 4 is a plan view showing a main part of a breaking bar as a component of the apparatus for manufacturing a glass sheet according to the embodiment of the present invention.
Fig. 5 is a schematic side view showing an implementation state of the method for manufacturing a glass plate according to the embodiment of the present invention.
Fig. 6 is a schematic side view showing an implementation state of the method for manufacturing a glass plate according to the embodiment of the present invention.
Fig. 7 is a schematic side view showing an implementation state of the method for manufacturing a glass plate according to the embodiment of the present invention.
Fig. 8 is a schematic side view showing an implementation state of the method for manufacturing a glass plate according to the embodiment of the present invention.
Fig. 9 is a schematic perspective view of a glass plate according to an embodiment of the present invention.
Detailed Description
Hereinafter, a method and an apparatus for manufacturing a glass plate according to an embodiment of the present invention will be described with reference to the drawings.
Fig. 1 is a side view illustrating a manufacturing apparatus for a glass plate according to an embodiment of the present invention, and fig. 2 is a front view of the manufacturing apparatus as viewed along arrow X in fig. 1. As shown in these figures, the manufacturing apparatus 1 includes: a scoring mechanism S that forms a score line 3 extending in the width direction of the glass ribbon 2 on the glass ribbon 2 moving downward (in the direction of arrow Z, also referred to as the draw direction in this specification) in a vertical posture; a support mechanism 4 that supports a portion to be cut 2x existing below the scribe line 3 in the glass ribbon 2; and a breaking bar 5 that abuts against the glass ribbon 2. The manufacturing apparatus 1 further includes a moving mechanism 6 that moves the breaking rod 5 in the horizontal direction toward the glass ribbon 2 and moves the breaking rod backward to the retreat position. Here, the moving mechanism 6 is configured to move and abut the breaking bar 5 to the upper side of the scribe line 3 in a state where the peripheral portion of the formation region 2s of the scribe line 3 (hereinafter, referred to as the scribe line formation region 2 s) is bent in the longitudinal direction as shown by the solid line in fig. 1 when breaking the glass ribbon 2. The moving mechanism 6 is constituted by an air cylinder in the present embodiment, but may be a feeding device such as a cylinder or a ball screw mechanism other than the above.
The scribing mechanism S includes: a cutter wheel 7 that forms a scribe line 3 while running in the width direction (in fig. 1, in the direction perpendicular to the paper plane) on the surface 2a of the glass ribbon 2 moving in the arrow Z direction; and a support rod 8 that is long in the width direction and supports a portion of the glass ribbon 2 on which the cutter wheel 7 travels from the back surface 2b side. The cutter wheel 7 is formed into a disk shape having blades (edges) on the periphery thereof which rotates during travel. The support rods 8 have contact surfaces that contact portions where the cutter wheel 7 travels, and extend from both ends in the width direction of the glass ribbon 2.
The breaking bar 5 is in contact with a portion of the back surface 2b of the glass ribbon 2 above the scribe line 3 by contact, and has a contact side end portion 5a having a convex shape (for example, a semicircular shape or a curved shape) in a vertical cross-sectional side surface in contact with the back surface 2b of the glass ribbon 2. Here, the portion of the glass ribbon 2 that is not bent above the scribe line 3 and against which the breaking bar 5 abuts is a portion of the glass ribbon 2 that is separated upward by a predetermined distance L1 from the scribe line 3. The predetermined distance L1 is 5mm or more and less than 70mm. In addition, when the effective region (region of the product glass plate) is considered to exist in the glass ribbon 2, the predetermined distance L1 may be 5mm or more and less than the distance to the lower end of the effective region. The predetermined distance L1 in this case is set to 5mmm or more and less than 20mm in consideration of the effective region of the glass ribbon 2 in this embodiment. Both ends in the width direction of the breaking bar 5 are positioned further inward in the width direction than both ends in the width direction of the glass ribbon 2.
Fig. 3 is a cross-sectional plan view taken along the line Y-Y of fig. 2. As shown in the figure, the glass ribbon 2 has a curved shape that is convex toward one side (the front surface 2a side) along the width direction (W-W direction), and both ends in the width direction are held by a pair of claws 1lax of a chuck 11a described later. The contact-side end 5a of the breaking bar 5 has a curved shape that is convex toward the same side as the glass ribbon 2 in the width direction. In this embodiment, the shape of the breaking bar 5 itself in the width direction is also a curved shape that is convex to the same side as the glass ribbon 2. The breaking bar 5 is divided into two breaking bar members 5x and 5y, and the two members 5x and 5y are connected at the widthwise central position of the breaking bar 5. The two members 5x and 5y have a symmetrical shape. Therefore, the two members 5x and 5y have the contact side ends 5xa and 5ya, respectively, and the two contact side ends 5xa and 5ya are connected to form the contact side end 5a of the above-described breaking lever 5.
Fig. 4 is an enlarged plan view of a main portion showing the coupling portions of the two break bar members 5x and 5y. As shown in the figure, in the connecting portion between the two breaking bar members 5x and 5y, the end portions 5xb and 5yb on the glass ribbon 2 side are in contact with each other, and the breaking bar 5 is symmetrical in the width direction about the end portions 5xb and 5 yb. Further, the gap SP between the facing end surfaces 5xc, 5yc of the two break lever members 5x, 5y gradually increases toward the side opposite to the glass ribbon 2 side. The two break lever members 5x and 5y are connected so that the angle formed by the two break lever members 5x and 5y can be adjusted. The angle adjustment mechanism MC for adjusting the angle includes: a plate PL which is attached to the two members 5x and 5y across the two members 5x and 5y and has a long hole HL; and bolts Bx, by inserted into the long holes HL of the plate PL and screwed into the two members 5x, 5y. According to this angle adjustment mechanism MC, the bolts Bx and By are loosened, the angles of the two members 5x and 5y are changed with the contact portions of the both end portions 5xb and 5yb as supporting points, and then the bolts Bx and By are fastened, whereby the angles of the two members 5x and 5y can be adjusted. The angle of the two members 5x and 5y is adjusted every time the curvature of the curved shape of the glass ribbon 2 changes. The angle of the two members 5x and 5y is preferably such that the end portions of the two breaking bar members 5x and 5y on the sides away from each other (the end portions on both ends in the width direction of the glass ribbon 2) do not contact the glass ribbon 2. In other words, the angle of the two members 5x and 5y is preferably such that, when the two members 5x and 5y come into contact with the glass ribbon 2, a pressing force (touching force) greater than that on both sides in the width direction acts on the center portion in the width direction of the glass ribbon 2. In this way, the crack origin, which will be described later, can be formed in the longitudinal center portion of the cut edge of the glass plate 2 y.
The components of the manufacturing apparatus 1 will be described with reference to fig. 1 and 2 again. A suction nozzle 9 for sucking glass powder generated by breaking is disposed at a position on the back side of the scribe line 3 of the glass ribbon 2. The suction nozzle 9 has an opening 9a facing the surface 2a of the glass ribbon 2, and performs suction of the glass frit through the opening 9a by operation of a negative pressure generating device (not shown) such as a negative pressure pump.
The support mechanism 4 includes: an arm 10 extending in the longitudinal direction of the glass ribbon 2; and a chuck group 11 including a plurality of (five in the present embodiment) chucks 11a attached to the arm 10 at intervals. The arm 10 and the gripper group 11 are disposed on one side and the other side in the width direction of the glass ribbon 2, respectively. Each of the plurality of chucks 11a includes a pair of claws 11ax for gripping the portion to be cut 2x of the glass ribbon 2 in the thickness direction.
The support mechanism 4 is configured to change the posture from the basic posture shown by the chain line in fig. 1 to the inclined posture shown by the solid line in the drawing while supporting the portion to be cut 2x. The posture of the support mechanism 4 is changed by the rotational operation of the support mechanism 4 around the vicinity of the position of the breaking lever 5 (the position shown by the solid line in fig. 1). The posture of the support mechanism 4 is changed while moving downward at the same speed as the glass ribbon 2. The support mechanism 4 bends the peripheral edge portion of the scribe line forming region 2s of the glass ribbon 2 so as to be convex in the longitudinal direction toward the front surface 2a by the above-described rotation operation. The rotation operation of the support mechanism 4 is synchronized with the movement of the moving mechanism 6 to move the breaking lever 5 toward the glass ribbon 2. Then, the moving mechanism 6 causes the breaking lever 5 to touch the glass ribbon 2 at the same timing as the timing at which the rotation operation of the supporting mechanism 4 is completed. Specifically, the moving mechanism 6 is configured to bring the breaking lever 5 into contact with the glass ribbon 2 within 1 second before and after the completion of the rotation operation of the support mechanism 4 and the completion of the operation of bending the glass ribbon 2. In this embodiment, the moving mechanism 6 is configured to bring the breaking lever 5 into contact with the glass ribbon 2 immediately before the time when the rotation operation of the support mechanism 4 is completed, in other words, before the time and within 1 second of the time. While the support mechanism 4 supports the portion to be cut 2x, the glass ribbon 2 is bent so as to become convex on the side of the front surface 2a in the width direction, as shown in fig. 3.
In this embodiment, the arm 10 and the collet group 11 disposed on one side in the width direction of the glass ribbon 2 and the arm 10 and the collet group 11 disposed on the other side in the width direction of the glass ribbon 2 are configured to rotate integrally. However, the arms 10 and the gripper groups 11 on both sides may be independently rotated.
Among the components of the manufacturing apparatus 1, the breaking bar 5 and the support bar 8 are mounted on a first housing (not shown) disposed on the back surface 2b side of the glass ribbon 2, and the cutter wheel 7 and the suction nozzle 9 are mounted on a second housing (not shown) disposed on the front surface 2a side of the glass ribbon 2. The first housing and the second housing are movable in the vertical direction. Thus, the breaking lever 5 and the support lever 8 are configured to move up and down integrally with the first housing while maintaining their relative positional relationship in the up-down direction. The cutter wheel 7 and the suction nozzle 9 are configured to move up and down integrally with the second housing while maintaining the relative positional relationship in the vertical direction.
The first casing and the second casing can move downward following the glass ribbon 2 at the same speed as the downward movement speed of the glass ribbon 2. Accordingly, the breaking bar 5, the support bar 8, the cutter wheel 7, and the suction nozzle 9 are configured to function as they are, while moving downward at the same speed as the downward movement speed of the glass ribbon 2, as the first housing and the second housing follow the downward movement of the glass ribbon 2. Similarly, the support mechanism 4 is configured to function as it is while moving downward at the same speed as the moving speed of the glass ribbon 2. Therefore, when the above-described components of the manufacturing apparatus 1 perform their own functions, the relative speed in the vertical direction with respect to the glass ribbon 2 is zero.
Among the above-described components, the breaking lever 5, the support lever 8, the cutter wheel 7, and the suction nozzle 9 are configured to move in the thickness direction of the glass ribbon 2 between an operating position for performing their functions and a retracted position for being retracted away from the glass ribbon 2 as indicated by arrows in fig. 1. The movement of each component in the thickness direction is performed while moving downward at the same speed as the glass ribbon 2. The breaking lever 5, the cutter wheel 7, the support lever 8, and the suction nozzle 9 are in the operating position shown by the solid line in fig. 1, and in the retracted position shown by the dashed-dotted line in the figure.
A regulating roller 12 serving as a fulcrum point when the glass ribbon 2 is bent by the rotation of the supporting mechanism 4 is disposed above the scoring mechanism S on the front surface 2a side of the glass ribbon 2. When the glass ribbon 2 is broken, tension is applied to the glass ribbon 2 (the peripheral portion of the scribe line forming region 2 s) between the support mechanism 4 and the regulating roller 12. Therefore, when the breaking lever 5 touches the glass ribbon 2, tension is applied to the touched portion of the glass ribbon 2.
Next, a method for producing a glass plate using the above-described production apparatus 1 will be described with reference to fig. 5 to 8.
In the method of manufacturing a glass sheet according to the present embodiment, the glass ribbon 2 to be broken is formed by, for example, a down-draw method (overflow down-draw method or the like). The glass ribbon 2 is formed to have a thickness of, for example, 1000 μm or less (preferably 700 μm or less and 100 μm or more) and has flexibility capable of bending by an external force.
The method for manufacturing a glass plate according to the present embodiment roughly includes a scribing step of forming a scribing line 3 on a glass ribbon 2 and a breaking step of breaking the glass ribbon 2 along the scribing line 3 formed in the scribing step and cutting a glass plate.
In the scribing step, as shown in fig. 5, first, the cutter wheel 7 and the support bar 8 are moved from the retracted position to the operating position while the plurality of chucks 11a of the support mechanism 4 support the portion to be cut 2x. Next, the cutter wheel 7 moved to the operating position is caused to travel in the width direction on the surface 2a of the glass ribbon 2 to form the scribing line 3.
After the scribing process is completed as described above, the cutter wheel 7 and the support rod 8 are moved from the operating position to the retracted position. In this case, the plurality of chucks 11a of the support mechanism 4 continue to support the portion to be cut 2x after the completion of the scribing process. Here, at the time point when the scribing process is completed, the cutter wheel 7 and the support bar 8 are in a state of being located at the same height position as the scribing line 3. In preparation for executing the breaking step from this state, both the first casing and the second casing are moved upward relative to the glass ribbon 2. Thereby, as shown in fig. 6, the breaking lever 5 is held at a height position separated from the scribing line 3 by a predetermined distance L1 upward, and the suction nozzle 9 is held at the same height position as the scribing line 3.
In the breaking step, as shown in fig. 7, the support mechanism 4 is rotated in the direction indicated by the arrow C while the breaking lever 5 and the suction nozzle 9 are held at the retracted position. Thereby, the posture of the support mechanism 4 is changed from the basic posture to the inclined posture, and the peripheral portion of the scribe line forming region 2s of the glass ribbon 2 starts to be bent so that the front surface 2a side becomes convex. At this time, since the portion of the glass ribbon 2 above the scribe line forming region 2s is supported by the regulating roll 12, tension is applied to the peripheral portion of the scribe line forming region 2 s. The moving mechanism 6 moves the breaking bar 5 in the horizontal direction toward the glass ribbon 2 in the middle of the rotation of the support mechanism 4. In the same manner, the suction nozzle 9 is also moved toward the glass ribbon 2. At a point in time when the angle α of the support mechanism 4 with respect to the vertical line reaches a predetermined inclination angle, that is, immediately before the rotation operation of the support mechanism 4 is completed, the moving mechanism 6 causes the contact-side end portion 5a of the breaking lever 5 to contact the back surface 2b of the glass ribbon 2. In this case, the portion where the contact side end portion 5a of the breaking bar 5 contacts the back surface 2b of the glass ribbon 2 is a portion separated upward by a predetermined distance L1 (strictly, the predetermined distance L1 shown in fig. 6) from the scribe line 3. The form when the contact-side end portion 5a of the breaking bar 5 contacts the glass ribbon 2 is the form shown by the solid line in fig. 1 in a side view, and the form shown in fig. 3 in a plan view. In this case, the contact-side end portion 5a of the breaking bar 5 contacts the back surface 2b of the glass ribbon 2 before other portions (the peripheries of both end portions in the width direction, etc.) at the center portion in the width direction. Therefore, when the contact-side end portion 5a of the breaking bar 5 is brought into contact with the back surface 2b of the glass ribbon 2, a pressing force (contact force) greater than that applied to both sides in the width direction acts on the width-direction center portion of the glass ribbon 2. As a result, a starting point of crack propagation is formed in the center portion of the scribe line 3 in the width direction, and the crack smoothly progresses toward both end portions of the scribe line 3 in the width direction with the starting point as a starting point.
By this operation, the glass ribbon 2 is broken along the scribe line 3, and the portion to be cut 2x is cut as a glass plate 2 y. Immediately after the breaking, as shown in fig. 8, the lower end cleaved end face 2z of the glass ribbon 2 and the upper end cleaved end face 2yz of the glass plate 2y are separated from each other and do not contact each other, and the breaking bar 5 does not contact the glass ribbon 2 (2 z) and the glass plate 2y (2 yz). The glass powder generated by the breakage is sucked by the suction nozzle 9.
Fig. 9 is a perspective view showing a rectangular glass plate 2y cut out by such an action. As shown in the figure, crack origin D formed by contact of the breaking bar 5 (specifically, the end portions 5xb, 5 yb) exists on one side 2z or two parallel sides 2z of the four sides of the glass plate 2 y. More specifically, the crack origin D is formed on one end surface 2Z orthogonal to the Z direction, which is the drawing direction, or two parallel end surfaces 2Z orthogonal to the Z direction, among the four end surfaces of the glass plate 2 y. In the illustrated example, the crack origin D is present only on one side (one end surface) 2z, but the same crack origin may be present also on a side (end surface) parallel to the one side. In the present embodiment, the crack origin D is formed on the end surface 2z with one surface 2y1 of the front and back surfaces of the glass plate 2y as one end and does not reach the other surface 2y2 of the glass plate 2 y. The one surface 2y1 corresponds to the back surface of the glass ribbon 2. The crack origin D is present in a range (K) of 10% (Ly) of the total length (Lx) in the longitudinal direction from the longitudinal center point (j) of the end surface 2z toward both sides in the longitudinal direction. The crack origin D can be identified or estimated by a method of confirming with an electron microscope, and when the crack origin D cannot be confirmed with an electron microscope, it can be identified or estimated by a method of estimating with a rib or a wanner line (wanner line) formed in the glass plate 2 y.
The plate pulling direction can be confirmed by a known method, for example, by the direction of linear irregularities formed on the surface of the glass plate 2 y.
According to the present embodiment in which the fracture is performed as described above, the following operational effects are obtained.
In the present embodiment, when the glass ribbon 2 having a shape along the width direction in a curved shape protruding to one side is broken, the breaking bar 5 having the abutment side end portion 5a having a shape along the width direction in a curved shape protruding to the same side as the glass ribbon 2 is used. Therefore, it is possible to suppress the occurrence of a breakage or a cutting error when the glass ribbon 2 bent in the width direction is broken by the breaking rod 5. As a result, the quality of the cut glass plate 2y is improved, and the product yield is improved.
In the present embodiment, the peripheral portion of the scribe line forming region 2s in the glass ribbon 2 is bent in the longitudinal direction, and the contact side end portion 5a of the breaking bar 5 is brought into contact with the glass ribbon 2, so that the breaking is completed at the time of the contact. This reduces variations and fluctuations in the time required for breaking, and also reduces the production interval time.
In the present embodiment, when the contact-side end portion 5a of the breaking bar 5 is brought into contact with the glass ribbon 2, the widthwise central portion of the contact-side end portion 5a is brought into contact before the other portions, and therefore, at the time of contact, a crack smoothly extends from the widthwise central portion of the scribe line 3 toward both widthwise end portions. This enables high-quality breaking.
In the present embodiment, the breaking bar 5 is divided into two breaking bar members 5x, 5y in the width direction. Further, since the two members 5x and 5y are connected so that the angle formed therebetween in the width direction can be adjusted, the curvature of the curved shape (macroscopic curved shape) of the contact-side end portion 5a of the breaking bar 5 along the width direction can be changed. Here, the bent shape of the glass ribbon 2 in the width direction varies depending on the width-direction dimension and thickness of the glass ribbon 2. The curved shape of the contact side end portion 5a in the width direction can appropriately follow such a change.
In the present embodiment, the two break lever members 5x and 5y are connected at the widthwise central position of the break lever 5, and therefore the curvature of the curved shape of the contact-side end portion 5a along the widthwise direction can be changed by a simple operation. The shape of the contact-side end portion 5a along the width direction can be a curved shape symmetrical on both sides thereof with respect to the width direction center position.
The method for manufacturing a glass plate according to the embodiment of the present invention has been described above, but the present invention is not limited thereto, and various modifications can be made without departing from the scope of the invention.
In the above embodiment, the contact-side end portion 5a of the breaking bar 5 is brought into contact with a portion of the glass ribbon 2 above the score line 3, but the contact-side end portion 5a may be brought into contact with a portion of the glass ribbon 2 at the same height as the score line 3.
In the above embodiment, the contact-side end portion 5a of the breaking bar 5 is brought into contact with the glass ribbon 2 in a state where the glass ribbon 2 is bent in the longitudinal direction, but the glass ribbon 2 may be bent in the longitudinal direction and broken after the contact-side end portion 5a of the breaking bar 5 is brought into contact with the glass ribbon 2. In this case, the operation of bringing the contact-side end portion 5a of the breaking lever 5 into contact with the glass ribbon 2 is not performed, but a pressing force acts on the glass ribbon 2 from the contact-side end portion 5a of the breaking lever 5 as in the case of the operation of bringing into contact.
In the above embodiment, the shape of the breaking bar 5 itself in the width direction is a curved shape that protrudes to the same side as the glass ribbon 2, but the shape of the breaking bar 5 itself may be other shapes as long as the shape of the contact side end portion 5a in the width direction is a curved shape that protrudes to the same side as the glass ribbon 2. Further, as long as most of the shape of the abutment-side end portion 5a in the width direction is a curved shape that is convex toward the same side as the glass ribbon 2, a portion thereof may be a curved shape that is convex toward the opposite side from the glass ribbon 2.
In the above embodiment, the supporting mechanism 4 is configured to support the portion to be cut 2x of the glass ribbon 2 by the pair of claws 11ax of the chuck 11a, but instead, a configuration may be adopted in which the portion to be cut 2x is supported by a suction pad on the front surface or the back surface of the portion to be cut 2x.
In the above embodiment, the peripheral portion of the scribe line forming region 2s of the glass ribbon 2 is bent to be broken, but the glass ribbon can be similarly broken even when only the scribe line forming region 2s is bent, in other words, the glass ribbon can be similarly broken as long as at least the scribe line forming region 2s is bent.
Description of the reference numerals
1. Glass plate manufacturing device
2. Glass ribbon
2a surface of glass ribbon
2b Back of glass ribbon
2s formation region of scribing line (scribing line formation region)
2X scheduled cutting part
2y glass plate
2z edge (end face) of glass plate
3. Scribing line
4. Support mechanism
5. Breaking rod
5a abutting side end portion of the breaking bar
5x breaking rod member
5y breaking rod component
6. Moving mechanism
Origin of D crack
S ruling mechanism
MC angle adjustment mechanism.
Claims (8)
1. A method for manufacturing a glass plate, wherein a breaking bar is brought into contact with a glass ribbon moving downward in a vertical posture, the glass ribbon is broken along a scribing line extending in the width direction of the glass ribbon, and a glass plate is cut from the glass ribbon,
the method for manufacturing a glass sheet is characterized in that,
the glass ribbon is broken along the scribe line by bringing the glass ribbon, which has a shape in the width direction in a curved shape that protrudes to one side, into contact with the contact-side end portion of the breaking lever, which has a shape in the width direction in a curved shape that protrudes to the same side as the glass ribbon.
2. The method for producing glass sheet according to claim 1,
in a state where a forming region of the scribing line in the glass ribbon is bent in a longitudinal direction, a contact side end portion of the breaking bar is brought into contact with the glass ribbon by touching.
3. The method for producing glass sheet according to claim 2,
when the end of the broken rod is contacted with the glass band by touching, the central part of the broken rod in the width direction is contacted with the other parts before the other parts.
4. The method for producing glass sheets according to any one of claims 1 to 3,
the breaking bar is divided into a plurality of breaking bar members in the width direction, and adjacent breaking bar members of the plurality of breaking bar members are connected so that the angle formed by the adjacent two breaking bar members in the width direction can be adjusted.
5. The method for manufacturing glass plate according to claim 4,
the breaking bar is divided into two breaking bar members in the width direction, and the two breaking bar members are connected at the center position in the width direction of the breaking bar.
6. The method for producing a glass sheet according to any one of claims 1 to 5,
the method further includes the step of bringing the contact-side end portion of the breaking bar into contact with the glass ribbon so that a pressing force greater than that applied to both sides of the glass ribbon in the width direction acts on the center portion of the glass ribbon in the width direction, thereby causing a crack to progress toward both ends of the glass ribbon in the width direction starting from the center portion of the score line, and breaking the glass ribbon.
7. A glass plate manufacturing apparatus is configured to cut a glass plate from a glass ribbon by bringing a breaking bar into contact with the glass ribbon moving downward in a vertical posture and breaking the glass ribbon along a scribe line extending in a width direction of the glass ribbon,
the apparatus for manufacturing a glass sheet is characterized in that,
the glass ribbon is configured to be broken along the scribe line by bringing the glass ribbon, which has a curved shape that protrudes to one side along the width direction, into contact with an abutment-side end portion of the breaking bar, which has a curved shape that protrudes to the same side as the glass ribbon along the width direction.
8. A glass plate is a rectangular glass plate having four sides,
the glass sheet is characterized in that it is,
the crack origin is located in a range of 10% of the total length in the longitudinal direction from the center point in the longitudinal direction toward both sides in the longitudinal direction of one of the four sides orthogonal to the drawing direction or two sides parallel to the drawing direction.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2020-107741 | 2020-06-23 | ||
| JP2020107741 | 2020-06-23 | ||
| PCT/JP2021/017307 WO2021261086A1 (en) | 2020-06-23 | 2021-04-30 | Production method for glass sheet, production device for glass sheet, and glass sheet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115427363A true CN115427363A (en) | 2022-12-02 |
Family
ID=79282387
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202180028435.5A Pending CN115427363A (en) | 2020-06-23 | 2021-04-30 | Method for producing glass plate, apparatus for producing glass plate, and glass plate |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPWO2021261086A1 (en) |
| KR (1) | KR20230028714A (en) |
| CN (1) | CN115427363A (en) |
| WO (1) | WO2021261086A1 (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006124194A (en) * | 2004-10-26 | 2006-05-18 | Nippon Electric Glass Co Ltd | Method for cutting and separating glass plate and apparatus therefor |
| CN102249526A (en) * | 2010-04-29 | 2011-11-23 | 康宁股份有限公司 | Methods for separating glass sheets from continuous glass ribbons |
| CN106573818A (en) * | 2014-12-22 | 2017-04-19 | 日本电气硝子株式会社 | Glass sheet manufacturing device |
| CN108137373A (en) * | 2015-12-21 | 2018-06-08 | 日本电气硝子株式会社 | The manufacturing device of glass plate |
| CN108137372A (en) * | 2015-12-21 | 2018-06-08 | 日本电气硝子株式会社 | The manufacturing device of glass plate |
| CN109923079A (en) * | 2016-12-02 | 2019-06-21 | 日本电气硝子株式会社 | The manufacturing method of glass plate |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102583885B1 (en) * | 2015-10-30 | 2023-09-27 | 코닝 인코포레이티드 | Device and method for separating glass ribbon |
-
2021
- 2021-04-30 CN CN202180028435.5A patent/CN115427363A/en active Pending
- 2021-04-30 JP JP2022532374A patent/JPWO2021261086A1/ja active Pending
- 2021-04-30 WO PCT/JP2021/017307 patent/WO2021261086A1/en active Application Filing
- 2021-04-30 KR KR1020227031738A patent/KR20230028714A/en unknown
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006124194A (en) * | 2004-10-26 | 2006-05-18 | Nippon Electric Glass Co Ltd | Method for cutting and separating glass plate and apparatus therefor |
| CN102249526A (en) * | 2010-04-29 | 2011-11-23 | 康宁股份有限公司 | Methods for separating glass sheets from continuous glass ribbons |
| CN106573818A (en) * | 2014-12-22 | 2017-04-19 | 日本电气硝子株式会社 | Glass sheet manufacturing device |
| CN108137373A (en) * | 2015-12-21 | 2018-06-08 | 日本电气硝子株式会社 | The manufacturing device of glass plate |
| CN108137372A (en) * | 2015-12-21 | 2018-06-08 | 日本电气硝子株式会社 | The manufacturing device of glass plate |
| CN109923079A (en) * | 2016-12-02 | 2019-06-21 | 日本电气硝子株式会社 | The manufacturing method of glass plate |
Also Published As
| Publication number | Publication date |
|---|---|
| JPWO2021261086A1 (en) | 2021-12-30 |
| KR20230028714A (en) | 2023-03-02 |
| WO2021261086A1 (en) | 2021-12-30 |
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