WO2022196235A1 - Procédé de production d'une plaque de verre et dispositif permettant la production de cette dernière - Google Patents

Procédé de production d'une plaque de verre et dispositif permettant la production de cette dernière Download PDF

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Publication number
WO2022196235A1
WO2022196235A1 PCT/JP2022/006398 JP2022006398W WO2022196235A1 WO 2022196235 A1 WO2022196235 A1 WO 2022196235A1 JP 2022006398 W JP2022006398 W JP 2022006398W WO 2022196235 A1 WO2022196235 A1 WO 2022196235A1
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WIPO (PCT)
Prior art keywords
cutting
glass ribbon
glass
glass plate
length
Prior art date
Application number
PCT/JP2022/006398
Other languages
English (en)
Japanese (ja)
Inventor
隼人 奥
秀一郎 奥本
昌弘 古田
Original Assignee
日本電気硝子株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 日本電気硝子株式会社 filed Critical 日本電気硝子株式会社
Priority to JP2023506889A priority Critical patent/JPWO2022196235A1/ja
Priority to KR1020237033100A priority patent/KR20230158516A/ko
Priority to CN202280020700.XA priority patent/CN117062785A/zh
Publication of WO2022196235A1 publication Critical patent/WO2022196235A1/fr

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Classifications

    • 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
    • C03B33/037—Controlling or regulating
    • 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
    • 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
    • B26F3/002—Precutting and tensioning or breaking
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28D—WORKING STONE OR STONE-LIKE MATERIALS
    • B28D7/00—Accessories specially adapted for use with machines or devices of the preceding groups
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28D—WORKING STONE OR STONE-LIKE MATERIALS
    • B28D7/00—Accessories specially adapted for use with machines or devices of the preceding groups
    • B28D7/005—Devices for the automatic drive or the program control of the machines
    • 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
    • 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
    • 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
    • C03B33/03—Glass cutting tables; Apparatus for transporting or handling sheet glass during the cutting or breaking operations
    • 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
    • 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

Definitions

  • the present invention relates to a glass plate manufacturing method and a manufacturing apparatus for obtaining a glass plate by cutting a glass ribbon that moves downward (moves downward) in a vertical posture along its width direction at a standard cutting length.
  • the device disclosed in the same document includes scribing means for forming scribe lines on a glass ribbon moving downward in a vertical posture, a breaking bar (a fulcrum bar in the same document) that is pressed against the scribe line formation region of the glass ribbon, Supporting means (a folding arm in the document) for supporting the glass ribbon below the scribe line.
  • a scribe line is formed along the width direction of the glass ribbon by a scribing means, and then the glass ribbon is first folded in the scribe line formation region. Press the split bar.
  • the support means that supports the glass ribbon is operated to bend the scribe line forming region with the folding bar as a fulcrum. As a result, the glass ribbon is broken along the scribe lines, and the glass plate is cut out from the glass ribbon.
  • An object of the present invention is to reliably suppress the occurrence of longitudinal cracks in a glass ribbon when cutting out a glass plate from the glass ribbon.
  • the present invention which was invented to solve the above problems, comprises a cutting process for obtaining a glass sheet by cutting a glass ribbon that moves downward in a vertical posture along its width direction with a standard cutting length.
  • a determination step is provided for determining whether or not there is damage to the determination target, with a portion including at least one of the lower end portion of the glass ribbon and the upper end portion of the glass plate after cutting in the cutting step being determined.
  • the glass ribbon is cut with an extended cutting length longer than the standard cutting length in the next cutting step.
  • the lower edge of the glass ribbon after cutting in the cutting process is damaged, the upper edge of the glass sheet cut and separated from the glass ribbon may also be damaged in a position corresponding to the damage to the glass ribbon. many. Therefore, in the above configuration, in order to determine whether or not the lower end portion of the glass ribbon is damaged after cutting in the cutting step, the lower end portion of the glass ribbon and the upper end portion of the glass plate after cutting in the cutting step are determined in the determination step. At least one of them is set as a determination target, and the presence or absence of breakage of the determination target is determined.
  • the glass ribbon is cut in the next cutting step with an extended cutting length longer than the standard cutting length, so cutting the glass ribbon in the next cutting step From the position, the bottom edge where the breakage occurs is well removed downward. Therefore, it is possible to reliably prevent the occurrence of vertical cracks in the glass ribbon beyond the cutting position of the glass ribbon.
  • the sensor measures the width direction end portion of the determination target.
  • the widthwise end portions of the glass ribbon generally include ear portions having a greater plate thickness than the widthwise center portion. If the glass ribbon is cut (particularly by folding) in the vicinity of the cutting position without the ear portions, the glass ribbon is likely to be longitudinally cracked beyond the cutting position. Therefore, as in the above configuration, it is preferable that the sensor measures the width direction end portion to be determined in order to determine whether or not the width direction end portion of the glass ribbon is damaged.
  • the senor preferably measures the widthwise end portion and the widthwise central portion of the determination target.
  • the senor measures the width direction end portions and the width direction center portion to be determined in order to determine the presence or absence of damage in the width direction center portion in addition to the width direction end portions to be determined. preferably.
  • the value obtained by subtracting the standard cut length from the extended cut length is preferably 0.05 m or more and 4.0 m or less.
  • (extended cut length - standard cut length) is 0.05 m or more, the broken portion can be sufficiently separated downward from the cutting position of the glass ribbon. can.
  • (extended cut length - standard cut length) is set to 4.0 m or less, it is possible to suppress unreasonable lengthening of the cut length, and it becomes easy to secure a space for cutting.
  • the extended cut length is preferably 1.02 to 4.1 times the standard cut length.
  • the extended cutting length is 1.02 times or more the standard cutting length, the damaged portion can be sufficiently separated downward from the cutting position of the glass ribbon.
  • the extended cutting length is set to 4.1 times or less of the standard cutting length, it is possible to prevent the cutting length from becoming unreasonably long, and it becomes easy to secure a space for cutting.
  • the length of the extended cut length may be adjusted according to the mode of damage to be determined.
  • the length of the glass sheet cut by the extended cutting length can be set to an optimum length according to the mode of breakage. Therefore, waste of glass can be reduced as much as possible even if the glass sheet cut to the extended cutting length is discarded.
  • the length of the extended cut length may be adjusted according to at least one of the position and size of the damage to be determined.
  • the extended cut length can be increased, and if the damage is small, the extended cut length can be shortened.
  • the extended cutting length can be increased, and the possibility of the position of damage having an adverse effect is low. If it is the position, the extended cutting length can be shortened. That is, the length of the glass sheet cut by the extended cutting length can be set to an optimum length according to the position and size of the breakage. Therefore, waste of glass can be reduced as much as possible even if the glass sheet cut to the extended cutting length is discarded.
  • the cutting step includes a scribing step of forming a scribe line along the width direction of the glass ribbon, and a scribe line of the glass ribbon. and a breaking step of cutting the glass plate by breaking the glass ribbon along the scribe line while the lower part of the glass ribbon is supported by a support means. It is preferable to press the folding bar against the line forming area.
  • the glass ribbon can be easily cut along the width direction.
  • the glass ribbon can be cut by laser cutting, laser fusion cutting, or the like, but the setting of cutting conditions, etc. tends to be more complicated than in the above configuration.
  • the folding step is performed by operating the support means while pressing the folding bar against the scribe line forming region so that the scribe line forming region is formed with the breaking bar as a fulcrum.
  • the scribe line formation region is curved more than when the glass ribbon is cut at the standard cutting length. It is preferable to slow down the operating speed of the means.
  • the glass ribbon When cutting the glass ribbon with an extended cutting length, the glass ribbon contains breakage. Therefore, from the viewpoint of suppressing vertical cracking of the glass ribbon, it is preferable to safely cut the glass ribbon by lowering the operation speed of the support means than in the normal operation, as in the above configuration.
  • the breaking step is performed by pressing the breaking bar against the scribe line forming area while the support means is operated to bend the scribe line forming area in the vertical direction.
  • the operation speed of the supporting means that bends the scribe line formation region when cutting the glass ribbon at the extended cutting length which is the step of breaking the glass ribbon, more than when cutting the glass ribbon at the standard cutting length;
  • At least one of the operating speeds of the folding bar that is pressed against the scribe line forming area is preferably slowed down.
  • At least one of the operating speed of the support means and the operating speed of the folding bar is set to be lower than normal, as in the above configuration, so that the glass ribbon can be safely cut. Cutting is preferred.
  • the present invention which was invented to solve the above problems, is a glass cutting device having a cutting device for obtaining a glass sheet by cutting a glass ribbon moving downward in a vertical posture along its width direction with a standard cutting length.
  • a determination unit that determines whether or not there is damage to the determination target portion including at least one of the lower end portion of the glass ribbon and the upper end portion of the glass plate after cutting by the cutting device, and a determination unit.
  • a control unit that adjusts the cutting length of the glass ribbon based on the determination result, and the control unit adjusts the next cutting length of the glass ribbon by the cutting device when the determination unit determines that there is breakage to be determined. , is set to an extended cutting length longer than the standard cutting length.
  • the present invention when a glass plate is cut out from a glass ribbon, it is possible to reliably prevent the occurrence of longitudinal cracks in the glass ribbon.
  • BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic side view which shows the whole structure of the manufacturing apparatus of the glass plate which concerns on 1st embodiment of this invention.
  • BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic front view (viewed from the A direction of FIG. 1) which shows the implementation condition of the manufacturing method of the glass plate which concerns on 1st embodiment of this invention.
  • BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic front view (viewed from the A direction of FIG. 1) which shows the implementation condition of the manufacturing method of the glass plate which concerns on 1st embodiment of this invention.
  • BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic front view (viewed from the A direction of FIG.
  • BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic front view (viewed from the A direction of FIG. 1) which shows the implementation condition of the manufacturing method of the glass plate which concerns on 1st embodiment of this invention.
  • BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic front view (viewed from the A direction of FIG. 1) which shows the implementation condition of the manufacturing method of the glass plate which concerns on 1st embodiment of this invention.
  • BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic front view (viewed from the A direction of FIG. 1) which shows the implementation condition of the manufacturing method of the glass plate which concerns on 1st embodiment of this invention.
  • BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic front view (viewed from the A direction of FIG. 1) which shows the implementation condition of the manufacturing method of the glass plate which concerns on 1st embodiment of this invention.
  • BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic front view (viewed from the A direction of FIG. 1) which shows the implementation condition of the manufacturing method of the glass plate which concerns on 1st embodiment of this invention.
  • It is a schematic front view (viewed from the A direction of FIG. 1) which shows the principal part of the manufacturing apparatus of the glass plate which concerns on 3rd embodiment of this invention.
  • It is a schematic front view (viewed from the A direction of FIG. 1) which shows the principal part of the manufacturing apparatus of the glass plate which concerns on 4th embodiment of this invention.
  • FIG. 1 It is a schematic front view (viewed from the A direction of FIG. 1) which shows the principal part of the manufacturing apparatus of the glass plate which concerns on 5th embodiment of this invention. It is a schematic front view (viewed from the A direction of FIG. 1) which shows the implementation condition of the manufacturing method of the glass plate which concerns on 5th embodiment of this invention. It is a schematic front view (viewed from the A direction of FIG. 1) which shows the implementation condition of the manufacturing method of the glass plate which concerns on 5th embodiment of this invention. It is a schematic front view (viewed from the A direction of FIG. 1) which shows the implementation condition of the manufacturing method of the glass plate which concerns on 5th embodiment of this invention. It is a schematic front view (viewed from the A direction of FIG. 1) which shows the implementation condition of the manufacturing method of the glass plate which concerns on 5th embodiment of this invention. It is a schematic front view (viewed from the A direction of FIG.
  • the glass plate manufacturing apparatus includes a glass ribbon G processing device 1 , a cutting device 2 , and a determination device 3 .
  • the glass ribbon G is configured to move downward in a vertical posture (preferably a vertical posture).
  • the processing apparatus 1 includes a forming zone 11 for continuously forming the glass ribbon G, a heat treatment zone 12 for heat-treating (slow cooling) the glass ribbon G, a cooling zone 13 for cooling the glass ribbon G to near room temperature, a forming zone 11,
  • a conveying device 14 composed of roller pairs R provided in a plurality of upper and lower stages.
  • the molding zone 11 and the heat treatment zone 12 are configured by a furnace in which the conveying path of the glass ribbon G is surrounded by walls, and a heating device such as a heater for adjusting the temperature of the glass ribbon G is installed at an appropriate place in the furnace. are placed.
  • a heating device such as a heater for adjusting the temperature of the glass ribbon G is installed at an appropriate place in the furnace.
  • the cooling zone 13 the circumference of the conveying path of the glass ribbon G is not surrounded by walls and is open to the ambient temperature outside atmosphere, and no heating device such as a heater is arranged.
  • a molded body 15 for molding a glass ribbon G from the molten glass Gm by the overflow downdraw method is arranged in the internal space of the molding zone 11 .
  • the molten glass Gm supplied to the molded body 15 overflows from a groove (not shown) formed in the top portion 15 a of the molded body 15 .
  • the overflowing molten glass Gm flows along both side surfaces 15b of the molded body 15 having a wedge-shaped cross section and joins at the lower end. Thereby, the plate-like glass ribbon G is continuously formed.
  • the internal space of the heat treatment zone 12 has a predetermined temperature gradient downward.
  • the vertically-positioned glass ribbon G is heat-treated (slowly cooled) so that its temperature decreases as it moves downward in the inner space of the heat treatment zone 12 . Internal strain of the glass ribbon G is reduced by this heat treatment.
  • the temperature gradient in the internal space of the heat treatment zone 12 is adjusted, for example, by a heating device provided on the inner surface of the wall of the heat treatment zone 12 .
  • a plurality of roller pairs R that constitute the conveying device 14 sandwich both widthwise end portions of the vertically oriented glass ribbon G from both the front and back sides.
  • the uppermost roller pair R arranged in the forming zone 11 is a cooling roller, sometimes referred to as an edge roller.
  • the plurality of roller pairs R may include those that do not sandwich the side end portions of the glass ribbon G. That is, the interval between the roller pairs R may be set larger than the thickness of the glass ribbon G at both ends in the width direction so that the glass ribbon G passes between the roller pairs R.
  • both ends in the width direction of the glass ribbon G manufactured by the processing apparatus 1 have portions thicker than the central portion in the width direction (hereinafter referred to as ear portions) due to the effects of shrinkage during the molding process. have.
  • the cutting device 2 cuts the vertically oriented glass ribbon G in the width direction for each predetermined length (standard cutting length L0) below the processing device 1, thereby sequentially cutting out the glass plates g from the glass ribbon G. It is configured.
  • the width direction is a direction orthogonal to the longitudinal direction (conveyance direction) of the glass ribbon G, and substantially coincides with the horizontal direction in this embodiment.
  • the cutting device 2 includes a scribing device 21 and a folding device 22 .
  • the scribing device 21 and the folding/splitting device 22 are configured to perform cutting-related operations while moving downward at the same speed as the glass ribbon G.
  • the scribing device 21 is a wheel cutter that forms a scribe line S on the first main surface of the downwardly moving glass ribbon G at the scribing position P1 while traveling along the width direction (in FIG. 1, the direction perpendicular to the paper surface). 23, and a support rod 24 elongated in the width direction for supporting a portion of the glass ribbon G on which the wheel cutter 23 travels from the second main surface side.
  • the wheel cutter 23 has a blade (edge) on the periphery that rotates during travel, and is formed in a disc shape.
  • the support rod 24 has an abutment surface that abuts against the portion on which the wheel cutter 23 travels.
  • the contact surfaces of the support rods 24 protrude from both ends of the glass ribbon G in the width direction.
  • the wheel cutter 23 and the support rod 24 are configured to move downward together with the glass ribbon G to form the scribe line S on the entire or part of the glass ribbon G in the width direction.
  • the scribe lines S are also formed on the ears.
  • the folding/splitting device 22 folds and splits the downwardly moving glass ribbon G along the scribing line S at the folding/splitting position P2 provided below the scribing position P1, and folds the glass ribbon G below the scribing line S (glass It is an apparatus for cutting out the lower region of the ribbon G) as a glass plate g.
  • the folding device 22 includes a folding bar 25 that contacts the scribe line formation region Sx from the second main surface side, and a support means 26 that supports the glass ribbon G below the folding position P2. I have.
  • the scribe position P1 and the breaking position P2 are regions having a width in the vertical direction.
  • the folding bar 25 has a contact surface with a convex longitudinal section (for example, semicircular or curved shape) that contacts the second main surface side of the scribe line forming region Sx.
  • the contact surface of the folding bar 25 protrudes from both ends of the glass ribbon G in the width direction.
  • the scribe line formation region Sx is a region including the scribe line S, for example, a region between portions of the glass ribbon G separated vertically by 80 to 120 mm from the scribe line S, respectively.
  • the support means 26 includes a plurality of chucks 27 that grip both ends in the width direction of the glass ribbon G, and an arm 28 that holds the plurality of chucks 27 (see FIG. 2).
  • the support means 26 is configured to change its posture from the basic posture indicated by the dashed line in FIG. 1 to the tilted posture indicated by the solid line in FIG. 1 while supporting the glass ribbon G.
  • the posture of the support means 26 is changed by rotating the support means 4 around the position of the folding bar 25 (solid line position shown in FIG. 1) (movement in the direction B in FIG. 1). Further, the posture of the support means 26 is changed while the glass ribbon G moves downward at the same speed. Then, the supporting means 26 bends the scribe line formation region Sx in the vertical direction so that the first main surface side is convex by the above-described rotating operation.
  • Such a rotating operation of the support means 26 plays a role of breaking the glass ribbon G along the scribe lines S in cooperation with the operation of pressing the breaking bar 25 against the scribe line forming region Sx.
  • the wheel cutter 23, the support rod 24, the folding bar 25, and the support means 26 described above move downward at the same speed as the glass ribbon G, while exhibiting their own functions.
  • the wheel cutter 23, the support rod 24, and the folding bar 25 move the glass ribbon G between an operating position for performing their own functions and a retracted position for retracting away from the glass ribbon G. It is configured to move along the thickness direction. Movement along the thickness direction of each of these constituent elements is performed while moving downward at the same speed as the glass ribbon G.
  • the folding bar 25 is at the operating position indicated by the solid line in FIG. 1, and is at the retracted position indicated by the chain line in FIG.
  • the wheel cutter 23 and the support rod 24 are in the operating position indicated by the broken line in FIG. 1, and the retracted position indicated by the solid line in FIG.
  • the determination device 3 determines the lower end portion Gt of the glass ribbon G and the glass plate g (standard glass plate gx or extended glass plate g) after being cut by the cutting device 2. gy) with the upper end portion gt as a determination target, and determines whether there is damage occurring in the determination target Gt, gt. In addition, only one of the lower end portion Gt of the glass ribbon G and the upper end portion gt of the glass plate g may be determined. The reason why only the upper end portion gt of the glass plate g may be judged is that, as shown in FIG.
  • the determination target may further include a portion of the glass ribbon G above the lower end portion Gt and/or a portion of the glass plate g below the upper end portion gt.
  • the determination device 3 includes a sensor 31 , a determination section 32 and a control section 33 .
  • the sensor 31 is composed of a thermography that measures the temperature distribution of the determination targets Gt and gt, and is arranged below the height position of the wheel cutter 23 and above the lower end of the support means 26 .
  • the sensor 31 of this embodiment is arranged below the height position of the folding bar 25 and above the lower end of the support means 26, and measures the temperature distribution over the entire width of the determination target Gt, gt.
  • the sensor 31 is arranged on one main surface side (first main surface side of the glass ribbon G) of the determination targets Gt and gt at the center position in the width direction of the determination targets Gt and gt so as to be spaced apart from the main surface. is set.
  • the separation distance of the sensor 31 from the determination targets Gt, gt can be arbitrarily set within a range where the temperature distribution of the determination targets Gt, gt can be measured without contact (for example, in the range of 800 to 3000 mm). Note that the sensor 31 may be arranged on the other main surface side of the determination targets Gt and gt.
  • the determination unit 32 performs image analysis on the thermal image showing the temperature distribution obtained by the sensor 31, and based on the result, determines whether there is damage to the determination targets Gt and gt. Since the temperature is different between the portion where the glass exists and the portion where the glass does not exist due to breakage or the like, if a thermography is used as the sensor 31, the presence or absence of breakage can be determined based on the temperature distribution.
  • the determination unit 32 is configured by an information processing device such as a personal computer, for example.
  • the glass ribbon G when the glass ribbon G is cut by folding, not only does the glass ribbon G after cutting sway, but the glass plate g also sways due to the vibration and shaking of the support means 26. There is Moreover, when the thickness of the glass ribbon G is thin or when the glass ribbon G is warped, the glass ribbon G and the glass plate g after being cut may sway significantly. However, since the judging section 32 judges the existence or non-existence of breakage occurring in the judging objects Gt and gt from the temperature distribution by the sensor 31, it is unlikely to be adversely affected by shaking of the glass ribbon G and the glass plate g.
  • the control unit 33 adjusts the cutting length of the glass ribbon based on the determination result of the determination unit 32. Specifically, when the determination unit 32 determines that there is no damage to the determination targets Gt and gt, the control unit 33, as shown in FIGS. Set the cut length to the standard cut length L0. On the other hand, when the determination unit 32 determines that the determination targets Gt and gt are damaged, the control unit 33 controls the next cutting length of the glass ribbon G by the cutting device 2 as shown in FIGS. is set to an extended cutting length L1 longer than the standard cutting length L0. In order to perform cutting with the standard cutting length L0 or the extended cutting length L1, the control unit 33 controls the wheel cutter 23, the support rod 24, the splitting bar 25, the support means 26, etc. to cut the respective cutting length L0, A control signal corresponding to L1 is issued. In addition, the cutting lengths L0 and L1 are managed by the moving distance and/or moving time of the glass ribbon G downward.
  • the method for manufacturing a glass plate includes a forming process, a transporting process, and a determining process.
  • the conveying process includes a heat treatment process, a cooling process, and a cutting process.
  • the forming step is a step of forming the glass ribbon G in the forming zone 11 by an overflow down-draw method.
  • the glass ribbon G may be formed by other down-draw methods such as a redraw method and a slot down-draw method.
  • the glass ribbon G and the glass plate g have a widthwise length of 1000 to 3500 mm and a thickness of 100 to 2000 ⁇ m.
  • the standard cutting length L0 of the glass ribbon G is 800-3000 mm.
  • the extended cut length L1 is longer than the standard cut length L0, and the difference (L1-L0) is preferably 0.05 m or more and 4.0 m or less, more preferably 0.5 m or more and 1.5 m or less. preferable.
  • the ratio (L1/L0) of the extended cut length L1 to the standard cut length L0 is preferably 1.02 or more and 4.1 or less, more preferably 1.05 or more and 2.0 or less.
  • each of the standard cutting length L0 and the extended cutting length L1 is the position (upper end) of the scribe line S formed in the current (n-th) cutting step from the previous (n It means the length up to the position (lower end) of the scribe line S formed in the -1st cutting step. Therefore, when the glass ribbon G is damaged, the position of the scribe line S, which serves as a reference for the cutting length, may be an imaginary position where no glass exists.
  • the conveying step is a step of conveying downward the glass ribbon G formed by the roller pair R (conveying device).
  • the heat treatment step is a step of applying heat treatment (slow cooling) to the glass ribbon G while conveying the glass ribbon G that has undergone the forming step in the heat treatment zone 12 .
  • the cooling step is a step of cooling while conveying the glass ribbon G that has undergone the heat treatment step in the cooling zone 13 .
  • the cutting step is a step of cutting the glass ribbon G in the width direction by the cutting device 2 while conveying the glass ribbon G that has undergone the cooling step to cut out the glass sheet g.
  • the cutting step includes a scribing step of forming a scribe line S along the width direction of the glass ribbon G, and a state where the glass ribbon G is supported below the scribe line S by the chuck 27 of the support means 26. and a breaking step of breaking the ribbon G along the scribe line S to cut out the glass plate g (the standard glass plate gx or the extended glass plate gy).
  • the wheel cutter 23 and the support rod 24 are moved from the retracted position to the operating position while the plurality of chucks 27 of the support means 26 are supporting the glass ribbon G.
  • the wheel cutter 23 moved to the operating position is caused to run along the width direction on the first main surface of the glass ribbon G to form a scribe line S. As shown in FIG.
  • the wheel cutter 23 and the support rod 24 are moved from the operating position to the retracted position. In this case, the support of the glass ribbon G by the chuck 27 of the support means 26 is continued even after the scribing step is completed.
  • the wheel cutter 23 and the support rod 24 are in the same height position as the scribe line S.
  • the breaking bar 25 instead of the wheel cutter 23 and the support rod 24 is brought to the same height position as the scribe line S as shown in FIG. 3 or FIG. retained.
  • the supporting means 26 is rotated as indicated by an arrow B while the folding bar 25 is moved from the retracted position to the working position. That is, in the folding step, the support means 26 is rotated while the folding bar 25 is pressed against the first main surface of the scribe line forming region Sx, and the scribe line forming region Sx is formed with the folding bar 25 as a fulcrum. is curved in the vertical direction so that the first main surface side is convex. Thereby, as shown in FIG. 4 or 8, the glass ribbon G is broken along the scribe line S to cut out the glass plate g.
  • the determination process is a process of performing image analysis on the thermal image showing the temperature distribution by the sensor 31 and determining whether or not there is damage to the determination targets Gt and gt based on the results.
  • detailed information such as the position, shape, and size of the damage is also determined from the thermal image at the same time.
  • the determination process is automatically performed by the determination unit 32 .
  • a method for determining the extent of damage there is a method of determining the area of a high-temperature region with a predetermined temperature or higher in an image obtained by thermography.
  • a predetermined threshold value when the area of the high temperature region is equal to or less than a predetermined threshold value, it can be determined that the glass is severely damaged. This is because the portion with glass becomes hot, and the portion without glass due to breakage becomes cold.
  • the control unit 33 sets the cutting length of the glass ribbon G in the next cutting step to the standard cutting length L0, A control signal corresponding to the standard cutting length L0 is issued to the wheel cutter 23, the support rod 24, the folding bar 25, the support means 26, and the like.
  • the glass ribbon G is folded in the width direction at the standard cutting length L0, and the standard glass cut at the standard cutting length L0 is used as the glass plate g.
  • a plate gx is obtained. Specifically, as shown in FIG.
  • the wheel cutter 23 and the support rod 24 are used to form a scribe line S on the first main surface of the glass ribbon G in the width direction at a position corresponding to the standard cutting length L0. form along Thereafter, as shown in FIGS. 3 and 4, at the breaking position P2, the breaking bar 25 and the supporting means 26 break the glass ribbon G in the width direction at the standard cutting length L0 to cut out the standard glass plate gx.
  • the cut standard glass plate gx becomes a glass original plate (mother glass plate) from which one or more product glass plates are obtained. In other words, if the standard glass plate gx that has been cut out is not damaged, it is transported to post-processes including a process of cutting the edge, a cleaning process, an inspection process, a packing process, and the like.
  • the control unit 33 controls the glass ribbon G in the next cutting step.
  • the cutting length is set to the extended cutting length L1
  • a control signal corresponding to the extended cutting length L1 is issued to the wheel cutter 23, the support rod 24, the folding bar 25, the support means 26, and the like.
  • a scribe line S is formed in the width direction on the first main surface of the glass ribbon G by the wheel cutter 23 and the support rod 24 at a position corresponding to the extended cutting length L1.
  • the breaking bar 25 and the supporting means 26 break the glass ribbon G in the width direction along the extended cutting length L1 to cut out the extended glass plate gy.
  • the cut extended glass plate gy is discarded because it is a defective product. Note that when the determination unit 32 determines that the determination targets Gt and gt have damages D1 and D2, the glass plate g including the determination targets gt is similarly discarded.
  • the determination unit 32 determines that the determination targets Gt and gt have damages D1 and D2, at least two glass plates g are continuously discarded.
  • the discarding of the glass plate g is performed, for example, by releasing the support of the chuck 27 of the support means 26 and dropping the glass plate g into a collection chamber provided below the cutting chamber.
  • the next cutting is performed. Also in the process, the glass ribbon G is cut at the extended cutting length L1.
  • the glass ribbon G is cut with the standard cutting length L0. disconnect. Thereafter, similar operations are repeated while adjusting the cutting length of the glass ribbon G to either the standard cutting length L0 or the extended cutting length L1 according to the result of the determination step.
  • the glass ribbon G when there is breakage in the determination targets Gt and gt, the glass ribbon G is cut at the extended cutting length L1 longer than the standard cutting length L0. Therefore, the broken portion of the glass ribbon G can be sufficiently separated downward from the cutting position of the glass ribbon G (scribe line formation region Sx). Therefore, it is possible to reliably prevent the occurrence of longitudinal cracks in the glass ribbon G beyond the cutting position of the glass ribbon G.
  • the extended cut length L1 it is preferable to set the extended cut length L1 so that the portion of the glass ribbon G with the breakage D1 is located below the position where the lowermost chuck 27 of the support means 26 and the glass ribbon G contact each other. As a result, it is possible to reliably suppress the occurrence of longitudinal cracks in the glass ribbon G due to contact between the chuck 27 and the portion of the glass ribbon G having the breakage D1.
  • the extended cut length L1 is a predetermined fixed value in this embodiment, but depending on the size of the damage D1 and D2 of the determination target Gt and gt (the length in the vertical direction on the thermal image, the area, etc.) It may be a variable value that is changed. That is, if the damages D1 and D2 determined by the determination unit 32 are large, the extended cutting length L1 may be increased, and if the damages D1 and D2 are small, the extended cutting length L1 may be decreased. In this way, the length of the extended glass plate gy can be optimized according to the degree of breakage, so that waste of glass can be suppressed.
  • the traveling speed V1 of the wheel cutter 23 when cutting the glass ribbon G with the extended cutting length L1 as shown in FIG. It is preferable that the traveling speed of the wheel cutter 23 is lower than V0.
  • the operating speed of the support means 26 (operating speed in the direction B in FIG. 1) for curving the scribe line forming region Sx when cutting the glass ribbon G at the extended cutting length L1.
  • W1 is preferably lower than the operating speed W0 of the support means 26 for curving the scribe line forming region Sx when cutting the glass ribbon G at the standard cutting length L0 as shown in FIG.
  • the glass plate manufacturing apparatus and the glass plate manufacturing method according to the second embodiment of the present invention differ from the first embodiment in the breaking step of breaking the glass ribbon G.
  • FIG. in the folding step in the first embodiment the supporting means 26 is rotated while the folding bar 25 is pressed against the scribe line forming region Sx, so that the scribe line forming region Sx is longitudinally moved around the folding bar 25 as a fulcrum. The case of breaking a glass ribbon by bending it in a direction has been described.
  • the folding step in the second embodiment the folding bar 25 is pressed against the scribe line forming region Sx in a state in which the support means 26 is operated to bend the scribe line forming region Sx in the vertical direction. to break the glass ribbon. That is, the timing of pressing the folding bar 25 and the timing of rotating the supporting means 26 are different from those of the first embodiment.
  • the scribe line formation region Sx of the glass ribbon G is first curved in the vertical direction in the folding step after the scribing step is performed, so that at this time, the scribe line formation region Sx is forcibly generated in the region Sx. Curvature disappears naturally due to bending deformation.
  • the breaking bar 25 does not locally contact the region Sx but evenly contacts the region Sx. Further, since the glass ribbon G is broken while maintaining a uniform contact state with the breaking bar 25, cutting errors are less likely to occur. Furthermore, since the need to consider cutting errors during folding is reduced, it becomes possible to operate the support means 26 at high speed, and the tact time can be shortened.
  • the operation of the support means 26 is such that the scribe line formation region Sx is curved more than when the glass ribbon G is cut at the standard cutting length L0.
  • At least one of the speed and the operating speed of the folding bar 25 pressed against the scribe line forming region Sx is preferably low.
  • X1/X0 is 10. % to 90%.
  • Y1/ Y0 is preferably between 10% and 90%.
  • the glass plate manufacturing apparatus and the glass plate manufacturing method according to the third embodiment differ from the above-described embodiments in that a plurality of (three in the figure) sensors ( thermography) 31 is installed.
  • a plurality of sensors ( thermography) 31 is installed.
  • the single sensor 31 measures the entire width of the determination targets Gt and gt
  • the entire width of the determination targets Gt and gt can be measured more precisely. Therefore, in the determination step, the determining unit 32 can more precisely determine the presence or absence of damage in the width direction of the determination targets Gt and gt.
  • a dedicated sensor 31 for each of at least three areas of the determination target Gt, gt at one widthwise end, widthwise center, and widthwise other end.
  • the glass plate manufacturing apparatus and the glass plate manufacturing method according to the fourth embodiment of the present invention differ from the above-described embodiments in that, in the determination step, the determination target (glass ribbon G (lower end of Gt) is to measure only the width direction edge (edge) of Gt.
  • the sensors 31 are installed on both arms 28 of the support means 26, respectively.
  • one sensor 31 is installed on each arm 28 between the lowermost chuck 27 and the second chuck 27 from the bottom.
  • the determination unit 32 measures the presence or absence of both edges in the width direction of the determination target Gt that moves downward while passing between the chucks 27 of the support means 26 with the chucks 27 opened.
  • the control unit 33 controls the wheel cutter 23, the support rod 24, and the folding bar so as to start the cutting-related operation after a predetermined time has passed since the determination unit 32 determines that both edges in the width direction of the determination target Gt are present.
  • the cut length of the glass ribbon G (the position of the scribe line S formed in the n-th cutting process (upper end ) to the position (lower end) of the scribe line S formed in the (n ⁇ 1)th cutting step). Therefore, even with such a configuration, if it is determined in the determination step that there is damage to the determination target Gt, in the next cutting step, the glass ribbon G is cut with an extended cutting length that is longer than the standard cutting length. Become.
  • the glass plate manufacturing apparatus and the glass plate manufacturing method according to the fifth embodiment of the present invention differ from the above-described embodiments in that a plurality of sensors 31 are arranged in the vertical direction, , the determination target differs between the upper sensor 31a and the lower sensor 31b.
  • the determination area (area surrounded by a dotted line) Ja of the upper sensor 31a includes the entire width direction of the upper end portion gt of the glass plate g as a determination target
  • the lower sensor 31b A determination area (an area surrounded by a dotted line) Jb includes, as a determination target, the entire width direction of the central portion gu of the glass plate g below the upper end portion gt.
  • the extended cutting length L1 is set to a second length shorter than the first length.
  • breakage D8 may occur only in the central portion gu of the glass plate g (in the illustrated example, the widthwise end portion of the central portion gu). In this case, breakage of the glass is detected only by the lower sensor 31b. Even when the glass breakage is detected only by the lower sensor 31b in this way, the upper end portion gt of the glass plate g may have a small scratch or the like, and the extended cut length L1 is set to the first length (> the third two lengths).
  • the vertical range of the determination area Ja of the upper sensor 31a and the determination area Jb of the lower sensor 31b should be equal, or the vertical range of the determination area Ja of the upper sensor 31a should be equal to the determination area of the lower sensor 31b. It is preferably wider than the vertical range of Jb.
  • the range in the vertical direction of the judgment area Ja of the upper sensor 31a and the judgment area Jb of the lower sensor 31b is preferably 0.5 to 10% with respect to the standard cutting length L0 of the glass ribbon G, and 1 to 10%. 7% is more preferred.
  • the determination area (area surrounded by a dotted line) Jb of the lower sensor 31b includes the entire width direction of the lower end portion Gt of the glass ribbon G as a determination target, and the determination area (area surrounded by a dotted line) of the upper sensor 31a
  • the surrounding area) Ja may include, as a determination target, the entire width direction of the central portion Gu of the glass ribbon G above the lower end portion Gt.
  • the extended cut length L1 is a relatively long first length
  • the extended cut length L1 may be a relatively short second length.
  • the extended cut length L1 may be adjusted.
  • the extended cut length L1 is set relatively long when the damage location includes the width direction end portions, and the extended cut length L1 is set relatively short when the damage location is only the width direction center portion. good too.
  • the type of breakage includes not only the position of breakage but also the size of breakage, and the extended cut length L1 may be adjusted in consideration of the size of breakage.
  • the extended cut length L1 may be set relatively long when the damage is large, and the extended cut length L1 may be set relatively short when the damage is small.
  • the mode of damage may include, for example, the shape of the damaged portion, and the extended cut length L1 may be set according to the shape of the damaged portion.
  • the sensor 31 is not limited to this.
  • the sensor 31 may be another temperature sensor such as a radiation thermometer, or a laser sensor that emits laser light and detects transmitted light or reflected light from the determination targets Gt and gt.
  • the folding bar 25 is pressed at the same or substantially the same height position as the scribe line S in the glass ribbon G (scribe line forming region Gx). It may be pressed against a portion above the scribe line S.
  • the portion above the scribe line S is a portion of the glass ribbon G that is not curved in the vertical direction and is separated from the scribe line S by a predetermined distance.
  • This predetermined distance is 5 mm or more and less than 70 mm.
  • the predetermined distance is 5 mm or more from the scribe line S to the lower end of the effective area. may be less than the distance of The predetermined distance in this case is 5 mm or more and less than 20 mm in consideration of the effective area of the glass ribbon G in this embodiment.
  • the support means 4 rotates along a circular orbit centered on the position of the folding bar 25 (the position indicated by the solid line in FIG. 1).
  • a rotating operation may be performed.
  • the operation of the support means 4 may be an operation other than the rotating operation as long as it is an operation that can bend the scribe line forming region Gx.
  • the support means 4 is configured to sandwich and support the glass ribbon G with the chuck 27, but the support mode of the support means 4 is not limited to this.
  • the support means 4 may have a configuration in which the first main surface or the second main surface of the glass ribbon G is sucked and supported by a suction pad or the like.
  • the glass ribbon G is cut by folding along the scribe line S, but the glass ribbon G may be cut by other methods such as laser cutting or laser fusion cutting.

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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)

Abstract

La présente invention comprend : une étape de découpe consistant à découper un ruban de verre (G), qui se déplace vers le bas dans une orientation verticale, dans le sens de la largeur du ruban de verre (G) à une longueur de coupe standard (L0) de façon à obtenir une plaque de verre (g); et une étape de détermination consistant à déterminer la présence/l'absence de dommage à une cible de détermination qui est une partie comprenant le ruban de verre (G) et/ou la plaque de verre (g) après la découpe à l'étape de découpe. S'il est déterminé à l'étape de détermination qu'il y a un endommagement de la cible de détermination, le ruban de verre (G) sera, à l'étape de découpe suivante, coupé à une longueur de coupe étendue (L1) qui est plus longue que la longueur de coupe standard (L0).
PCT/JP2022/006398 2021-03-18 2022-02-17 Procédé de production d'une plaque de verre et dispositif permettant la production de cette dernière WO2022196235A1 (fr)

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JP2023506889A JPWO2022196235A1 (fr) 2021-03-18 2022-02-17
KR1020237033100A KR20230158516A (ko) 2021-03-18 2022-02-17 유리판의 제조 방법 및 그 제조 장치
CN202280020700.XA CN117062785A (zh) 2021-03-18 2022-02-17 玻璃板的制造方法以及其制造装置

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012090766A1 (fr) * 2010-12-27 2012-07-05 旭硝子株式会社 Procédé de fabrication de verre plat et dispositif de fabrication de verre plat
JP2016088785A (ja) * 2014-10-31 2016-05-23 ＡｖａｎＳｔｒａｔｅ株式会社 ガラス板の製造方法、及び、ガラス板の製造装置
WO2017110349A1 (fr) * 2015-12-21 2017-06-29 日本電気硝子株式会社 Dispositif de production d'une plaque de verre
JP2018090446A (ja) * 2016-12-02 2018-06-14 日本電気硝子株式会社 ガラス板の製造方法
WO2018123412A1 (fr) * 2016-12-26 2018-07-05 日本電気硝子株式会社 Procédé de détection d'un bris de verre, procédé de production de verre à vitre et dispositif de coupe de verre
WO2020129907A1 (fr) * 2018-12-21 2020-06-25 日本電気硝子株式会社 Procédé de fabrication pour plaque de verre et dispositif de fabrication associé

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012090766A1 (fr) * 2010-12-27 2012-07-05 旭硝子株式会社 Procédé de fabrication de verre plat et dispositif de fabrication de verre plat
JP2016088785A (ja) * 2014-10-31 2016-05-23 ＡｖａｎＳｔｒａｔｅ株式会社 ガラス板の製造方法、及び、ガラス板の製造装置
WO2017110349A1 (fr) * 2015-12-21 2017-06-29 日本電気硝子株式会社 Dispositif de production d'une plaque de verre
JP2018090446A (ja) * 2016-12-02 2018-06-14 日本電気硝子株式会社 ガラス板の製造方法
WO2018123412A1 (fr) * 2016-12-26 2018-07-05 日本電気硝子株式会社 Procédé de détection d'un bris de verre, procédé de production de verre à vitre et dispositif de coupe de verre
WO2020129907A1 (fr) * 2018-12-21 2020-06-25 日本電気硝子株式会社 Procédé de fabrication pour plaque de verre et dispositif de fabrication associé

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