JP2023110893A - Method for manufacturing glass plate, and apparatus for molding glass plate - Google Patents

Method for manufacturing glass plate, and apparatus for molding glass plate Download PDF

Info

Publication number
JP2023110893A
JP2023110893A JP2023009420A JP2023009420A JP2023110893A JP 2023110893 A JP2023110893 A JP 2023110893A JP 2023009420 A JP2023009420 A JP 2023009420A JP 2023009420 A JP2023009420 A JP 2023009420A JP 2023110893 A JP2023110893 A JP 2023110893A
Authority
JP
Japan
Prior art keywords
glass plate
main surface
lower mold
rotating
pressing
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
JP2023009420A
Other languages
Japanese (ja)
Inventor
駿 ▲高▼屋敷
Suguru Takayashiki
志郎 舩津
Shiro Funatsu
和成 依田
Kazunari Yoda
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AGC Inc
Original Assignee
Asahi Glass Co Ltd
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 Asahi Glass Co Ltd filed Critical Asahi Glass Co Ltd
Publication of JP2023110893A publication Critical patent/JP2023110893A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B23/00—Re-forming shaped glass
    • C03B23/02—Re-forming glass sheets
    • C03B23/023—Re-forming glass sheets by bending
    • C03B23/03—Re-forming glass sheets by bending by press-bending between shaping moulds
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C3/00—Glass compositions
    • C03C3/04—Glass compositions containing silica
    • C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
    • C03C3/083—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound
    • C03C3/085—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound containing an oxide of a divalent metal
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C3/00—Glass compositions
    • C03C3/04—Glass compositions containing silica
    • C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
    • C03C3/083—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound
    • C03C3/085—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound containing an oxide of a divalent metal
    • C03C3/087—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound containing an oxide of a divalent metal containing calcium oxide, e.g. common sheet or container glass

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)

Abstract

To provide a technique capable of improving the surface accuracy of a glass plate after molding.SOLUTION: A method for manufacturing a glass plate including a first main surface and a second main surface facing the first main surface and including curved surfaces in the first and second main surfaces comprises: installing the glass plate so as to face the first main surface of the glass plate to a lower die including a curved surface; installing a pressing part so as to face the second main surface of the glass plate supported by the lower die; and heating the glass plate. The pressing part liftable and installed only in a part of the second main surface and installed in the peripheral part of the second main surface presses the second main surface by the weight of the pressing part and is in the state of pressing only the part of the second main surface and the peripheral part thereof during the heating.SELECTED DRAWING: Figure 3

Description

本開示は、ガラス板の製造方法、及びガラス板の成形装置に関する。 TECHNICAL FIELD The present disclosure relates to a method for manufacturing a glass sheet and a forming apparatus for the glass sheet.

特許文献１に記載の成形方法においては、下型に載置したガラス板を加熱し、ガラス板の自重でガラス板を変形させる。この成形方法は、一般的に重力曲げ成形と呼ばれている。 In the molding method described in Patent Document 1, a glass plate placed on a lower mold is heated to deform the glass plate by its own weight. This molding method is generally called gravity bending.

国際公開第２０１６／０６７８２９号WO2016/067829

重力曲げ成形では、ガラス板の周縁部の少なくとも一部に作用する曲げモーメントがガラス板の中央部に作用する曲げモーメントに比べて小さく、ガラス板の面精度が低くなってしまう。 In gravity bending, the bending moment that acts on at least a part of the peripheral edge of the glass sheet is smaller than the bending moment that acts on the center of the glass sheet, resulting in low surface accuracy of the glass sheet.

本開示の一態様は、成形後のガラス板の面精度を向上する、技術を提供する。 One aspect of the present disclosure provides a technique for improving surface accuracy of a glass sheet after molding.

本開示の一態様に係るガラス板の製造方法は、第１主面と前記第１主面とは反対向きの第２主面とを含み、前記第１主面と前記第２主面に曲面を含む、ガラス板の製造方法であって、前記ガラス板の前記第１主面が曲面を含む下型に向かい合うように、前記ガラス板を設置することと、前記下型で支持されている前記ガラス板の前記第２主面に向かい合うように、押さえ部を設置することと、前記ガラス板を加熱することと、を有し、前記押さえ部は、昇降自在であって、前記第２主面の一部のみに設置され且つ前記第２主面の周縁部に設置され、前記押さえ部の重さで前記第２主面を押さえ、前記加熱の際には、前記第２主面の一部のみかつ周縁部を押さえた状態である、ガラス板の製造方法に関する。 A method for manufacturing a glass plate according to an aspect of the present disclosure includes a first principal surface and a second principal surface opposite to the first principal surface, and the first principal surface and the second principal surface are curved surfaces. A method for manufacturing a glass plate, comprising: placing the glass plate so that the first main surface of the glass plate faces a lower mold including a curved surface; installing a pressing portion so as to face the second main surface of the glass plate; and heating the glass plate, wherein the pressing portion is movable up and down, and the second main surface is installed only on a part of the second main surface and is installed on the peripheral edge of the second main surface, the weight of the holding part presses the second main surface, and when the heating is performed, a part of the second main surface The present invention relates to a method for manufacturing a glass plate in which the glass plate is only pressed and the peripheral portion is pressed.

本開示の一態様によれば、昇降自在な押さえ部の重さでガラス板の第２主面の周縁部を押さえることで、成形後のガラス板の面精度を向上できる。 According to one aspect of the present disclosure, by pressing the peripheral portion of the second main surface of the glass plate with the weight of the vertically movable pressing portion, the surface precision of the glass plate after molding can be improved.

図１は、一実施形態に係る成形装置を示す斜視図である。FIG. 1 is a perspective view showing a molding device according to one embodiment. 図２（Ａ）は図１の押さえ部を示す側面図であってガラス板を曲げる前の状態を示す側面図であり、図２（Ｂ）は図１の押さえ部を示す側面図であってガラス板を曲げた後の状態を示す側面図である。FIG. 2(A) is a side view showing the pressing portion in FIG. 1 and is a side view showing a state before the glass plate is bent, and FIG. 2(B) is a side view showing the pressing portion in FIG. It is a side view which shows the state after bending a glass plate. 図３（Ａ）は第１変形例に係る成形装置を示す側面図であってガラス板を曲げる前の状態を示す側面図であり、図３（Ｂ）は第１変形例に係る成形装置を示す側面図であってガラス板を曲げた後の状態を示す側面図である。FIG. 3(A) is a side view showing the forming apparatus according to the first modified example and is a side view showing a state before bending the glass sheet, and FIG. 3(B) shows the forming apparatus according to the first modified example. It is a side view which shows the state after bending a glass plate. 図４（Ａ）は第１変形例に係る押さえ部を示す斜視図であり、図４（Ｂ）は第１変形例に係る押さえ部を示す側面図である。FIG. 4A is a perspective view showing a pressing portion according to the first modified example, and FIG. 4B is a side view showing the pressing portion according to the first modified example. 図５（Ａ）は第２変形例に係る押さえ部を示す斜視図であり、図５（Ｂ）は第２変形例に係る押さえ部を示す側面図である。FIG. 5A is a perspective view showing a pressing portion according to the second modification, and FIG. 5B is a side view showing the pressing portion according to the second modification. 図６（Ａ）は第３変形例に係る押さえ部を示す斜視図であり、図６（Ｂ）は第３変形例に係る押さえ部を示す側面図である。FIG. 6A is a perspective view showing a pressing portion according to the third modification, and FIG. 6B is a side view showing the pressing portion according to the third modification. 図７（Ａ）は第４変形例に係る押さえ部を示す斜視図であり、図７（Ｂ）は第４変形例に係る押さえ部を示す側面図である。FIG. 7A is a perspective view showing a pressing portion according to the fourth modification, and FIG. 7B is a side view showing the pressing portion according to the fourth modification. 図８（Ａ）は第５変形例に係る押さえ部を示す斜視図であり、図８（Ｂ）は第５変形例に係る押さえ部を示す側面図である。FIG. 8A is a perspective view showing a pressing portion according to the fifth modification, and FIG. 8B is a side view showing the pressing portion according to the fifth modification.

以下、本開示の実施形態について図面を参照して説明する。なお、各図面において同一の又は対応する構成には同一の符号を付し、説明を省略することがある。明細書中、数値範囲を示す「～」は、その前後に記載された数値を下限値及び上限値として含むことを意味する。 Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In addition, in each drawing, the same reference numerals are given to the same or corresponding configurations, and explanations thereof may be omitted. In the specification, "-" indicating a numerical range means that the numerical values described before and after it are included as lower and upper limits.

図１と図２を参照して、一実施形態に係る成形装置１について説明する。成形装置１は、ガラス板２の曲げ成形に用いられる。成形装置１は、例えば、ガラス板２を載せた状態で、図示しない加熱炉の内部に入れられる。加熱炉は、バッチ式でも連続式でもよい。加熱炉は、成形装置１を搬送するコンベアを備えてもよく、連続搬送式であってもよい。連続搬送式の加熱炉は、搬送路に沿って複数のゾーンに区画される。ガラス板２は、例えば、成形装置１と共に搬送されながら、加熱される。 A molding apparatus 1 according to one embodiment will be described with reference to FIGS. 1 and 2. FIG. A forming apparatus 1 is used for bending a glass plate 2 . The molding apparatus 1 is placed in a heating furnace (not shown) with the glass plate 2 placed thereon, for example. The heating furnace may be of a batch type or a continuous type. The heating furnace may be provided with a conveyor for transporting the molding apparatus 1, or may be of a continuous transport type. A continuous transfer type heating furnace is divided into a plurality of zones along a transfer path. The glass plate 2 is heated while being transported together with the molding apparatus 1, for example.

ガラス板２は、ガラス板２の粘度が１０９Ｐａ・ｓ以下になるように加熱されることが好ましい。ガラス板２は、加熱によって軟化し、ガラス板２の重さと押さえ部２０の重さとによって下型１０の上面に倣うように変形する。下型１０の上面は曲面を含む。ガラス板２の粘度が１０１２Ｐａ・ｓ以下になる時間は３０分以下に設定されることが好ましく、且つガラス板２の粘度が１０１４．５Ｐａ・ｓ以下になる時間は６０分以下に設定されることが好ましい。ガラス板２は、曲げ成形された後に、冷却固化されることが好ましい。 The glass plate 2 is preferably heated so that the viscosity of the glass plate 2 becomes 10 9 Pa·s or less. The glass plate 2 is softened by heating and deformed by the weight of the glass plate 2 and the weight of the pressing portion 20 so as to follow the upper surface of the lower mold 10 . The upper surface of the lower mold 10 includes a curved surface. The time for the viscosity of the glass plate 2 to be 10 12 Pa s or less is preferably set to 30 minutes or less, and the time for the viscosity of the glass plate 2 to be 10 14.5 Pa s or less is 60 minutes or less. is preferably set. The glass plate 2 is preferably cooled and solidified after being bent.

ガラス板２は、無アルカリガラス、ソーダライムガラス、ソーダライムシリケートガラス、アルミノシリケートガラス、ボロシリケートガラス、リチウムアルミノシリケートガラス、又はホウケイ酸ガラスを含むことが好ましい。無アルカリガラスとは、Ｎａ２Ｏ、Ｋ２Ｏ等のアルカリ金属酸化物を実質的に含有しないガラスを意味する。ここで、アルカリ金属酸化物を実質的に含有しないとは、アルカリ金属酸化物の含有量の合量が０．１質量％以下を意味する。 The glass plate 2 preferably contains alkali-free glass, soda lime glass, soda lime silicate glass, aluminosilicate glass, borosilicate glass, lithium aluminosilicate glass, or borosilicate glass. Alkali-free glass means glass that does not substantially contain alkali metal oxides such as Na 2 O and K 2 O. Here, "substantially free of alkali metal oxides" means that the total content of alkali metal oxides is 0.1% by mass or less.

ガラス板２の用途が表示装置のカバーガラスである場合、下記に示すようなアルカリ金属酸化物を含むガラスを用いることが好ましい。アルカリ金属酸化物を含むガラスは、成形後に化学強化処理を施すことにより、ガラス表面に圧縮応力層を形成し、強度を高めることができる。 When the application of the glass plate 2 is a cover glass of a display device, it is preferable to use glass containing an alkali metal oxide as shown below. Glass containing an alkali metal oxide can be strengthened by forming a compressive stress layer on the surface of the glass by chemically strengthening the glass after molding.

アルカリ金属酸化物を含むガラスは、特に限定されないが、例えば、酸化物基準のモル％表示で、ＳｉＯ２を５０％～８０％、Ａｌ２Ｏ３を０．１％～２５％、Ｌｉ２Ｏ＋Ｎａ２Ｏ＋Ｋ２Ｏを３％～３０％、ＭｇＯを０％～２５％、ＣａＯを０％～２５％及びＺｒＯ２を０％～５％含む。具体例として、下記（ｉ）～（ｖ）のガラスが挙げられる。下記（ｉ）のガラスは、ソーダライムシリケートガラスに含まれる。下記（ｉｉ）、（ｉｉｉ）、及び（ｉｖ）のガラスは、アルミノシリケートガラスに含まれる。下記（ｖ）のガラスは、リチウムアルミノシリケートガラスに含まれる。 The glass containing an alkali metal oxide is not particularly limited, but for example, 50% to 80% SiO 2 , 0.1% to 25% Al 2 O 3 , Li 2 O + Na 2 O+K 2 O from 3% to 30%, MgO from 0% to 25%, CaO from 0% to 25% and ZrO 2 from 0% to 5%. Specific examples include glasses (i) to (v) below. The following glass (i) is included in soda lime silicate glass. The following glasses (ii), (iii), and (iv) are included in the aluminosilicate glass. The following glass (v) is included in the lithium aluminosilicate glass.

（ｉ）酸化物基準のモル％表示で、ＳｉＯ２を６３％～７３％、Ａｌ２Ｏ３を０．１％～５．２％、Ｎａ２Ｏを１０％～１６％、Ｋ２Ｏを０％～１．５％、Ｌｉ２Ｏを０％～５％、ＭｇＯを５％～１３％及びＣａＯを４％～１０％を含むガラス。なお、「Ｋ２Ｏを０％～１．５％含む」とは、Ｋ２Ｏは必須ではないが１．５％まで含まれてもよいという意味である。以下、他の物質の含有量が「０％～」と記載されている場合においても、同様である。 (i) SiO 2 is 63% to 73%, Al 2 O 3 is 0.1% to 5.2%, Na 2 O is 10% to 16%, and K 2 O is expressed in mol% based on oxides. A glass containing 0% to 1.5%, 0% to 5% Li 2 O, 5% to 13% MgO and 4% to 10% CaO. Note that "contains 0% to 1.5% of K 2 O" means that K 2 O is not essential, but may be contained up to 1.5%. The same applies hereinafter even when the content of other substances is described as "0% or more".

（ｉｉ）酸化物基準のモル％表示で、ＳｉＯ２を５０％～７４％、Ａｌ２Ｏ３を１％～１０％、Ｎａ２Ｏを６％～１４％、Ｋ２Ｏを３％～１１％、Ｌｉ２Ｏを０％～５％、ＭｇＯを２％～１５％、ＣａＯを０％～６％及びＺｒＯ２を０％～５％含有し、ＳｉＯ２及びＡｌ２Ｏ３の含有量の合計が７５％以下、Ｎａ２Ｏ及びＫ２Ｏの含有量の合計が１２％～２５％、ＭｇＯ及びＣａＯの含有量の合計が７％～１５％であるガラス。 (ii) 50% to 74% SiO 2 , 1% to 10% Al 2 O 3 , 6% to 14% Na 2 O, and 3% to 11% K 2 O, in terms of mol % based on oxides; %, Li 2 O 0%-5%, MgO 2%-15%, CaO 0%-6% and ZrO 2 0%-5%, and the content of SiO 2 and Al 2 O 3 Glass having a total content of 75% or less, a total content of Na 2 O and K 2 O of 12% to 25%, and a total content of MgO and CaO of 7% to 15%.

（ｉｉｉ）酸化物基準のモル％表示で、ＳｉＯ２を６８％～８０％、Ａｌ２Ｏ３を４％～１０％、Ｎａ２Ｏを５％～１５％、Ｋ２Ｏを０％～１％、Ｌｉ２Ｏを０％～５％、ＭｇＯを４％～１５％及びＺｒＯ２を０％～１％含有するガラス。 (iii) 68% to 80% of SiO2 , 4% to 10% of Al2O3 , 5% to 15% of Na2O , and 0% to 1% of K2O , in terms of mol% based on oxides; %, Li 2 O from 0% to 5%, MgO from 4% to 15% and ZrO 2 from 0% to 1%.

（ｉｖ）酸化物基準のモル％表示で、ＳｉＯ２を６７％～７５％、Ａｌ２Ｏ３を０％～４％、Ｎａ２Ｏを７％～１５％、Ｋ２Ｏを１％～９％、Ｌｉ２Ｏを０％～５％、ＭｇＯを６％～１４％及びＺｒＯ２を０％～１．５％含有し、ＳｉＯ２及びＡｌ２Ｏ３の含有量の合計が７１％～７５％、Ｎａ２Ｏ及びＫ２Ｏの含有量の合計が１２％～２０％であり、ＣａＯを含有する場合その含有量が１％未満であるガラス。 (iv) 67% to 75% SiO 2 , 0% to 4% Al 2 O 3 , 7% to 15% Na 2 O, and 1% to 9% K 2 O, in terms of mol % based on oxides; %, Li 2 O 0%-5%, MgO 6%-14% and ZrO 2 0%-1.5%, and the total content of SiO 2 and Al 2 O 3 is 71%-75% %, the total content of Na 2 O and K 2 O is between 12% and 20%, and the content of CaO, if any, is less than 1%.

（ｖ）酸化物基準のモル％表示で、ＳｉＯ２を５６％～７３％、Ａｌ２Ｏ３を１０％～２４％、Ｂ２Ｏ３を０％～６％、Ｐ２Ｏ５を０％～６％、Ｌｉ２Ｏを２％～７％、Ｎａ２Ｏを３％～１１％、Ｋ２Ｏを０％～２％、ＭｇＯを０％～８％、ＣａＯを０％～２％、ＳｒＯを０％～５％、ＢａＯを０％～５％、ＺｎＯを０％～５％、ＴｉＯ２を０％～２％、ＺｒＯ２を０％～４％含有するガラス。 ( v) 56% to 73% of SiO2 , 10% to 24% of Al2O3 , 0% to 6% of B2O3 , and 0% of P2O5 in terms of mol% based on oxides ; ~6%, 2%-7% Li2O , 3%-11% Na2O , 0%-2% K2O , 0%-8% MgO, 0%-2% CaO, A glass containing 0% to 5% SrO, 0% to 5% BaO, 0% to 5% ZnO, 0% to 2% TiO 2 and 0% to 4% ZrO 2 .

ガラス板２は、成形前に、例えば図２（Ａ）に示すように平板であることができる。ガラス板２の厚さは、０．２ｍｍ以上が好ましく、０．８ｍｍ以上がより好ましく、１ｍｍ以上が更に好ましい。ガラス板２の厚さは、５ｍｍ以下が好ましく、３ｍｍ以下がより好ましく、２ｍｍ以下が更に好ましい。ガラス板２が車載用表示装置のカバーガラスである場合、ガラス板２の厚さは０．８ｍｍ以上３ｍｍ以下であることが好ましい。 The glass plate 2 can be flat before molding, for example, as shown in FIG. 2(A). The thickness of the glass plate 2 is preferably 0.2 mm or more, more preferably 0.8 mm or more, and even more preferably 1 mm or more. The thickness of the glass plate 2 is preferably 5 mm or less, more preferably 3 mm or less, and even more preferably 2 mm or less. When the glass plate 2 is a cover glass for a vehicle-mounted display device, the thickness of the glass plate 2 is preferably 0.8 mm or more and 3 mm or less.

成形後のガラス板２は、第１主面２ａと、第１主面２ａとは反対向きの第２主面２ｂと、を含む。第１主面２ａと第２主面２ｂは、例えば図２（Ａ）に示すように成形前に平面であることができ、例えば図２（Ｂ）に示すように成形後に曲面を含む。なお、成形後の第１主面２ａと第２主面２ｂは曲面を含めばよく、一部に平面を含んでもよい。 The glass plate 2 after molding includes a first principal surface 2a and a second principal surface 2b opposite to the first principal surface 2a. The first major surface 2a and the second major surface 2b can be flat before molding, for example as shown in FIG. 2(A), and include curved surfaces after molding, for example as shown in FIG. 2(B). In addition, the 1st main surface 2a and the 2nd main surface 2b after shaping|molding should just include a curved surface, and may include a plane in part.

成形後の第１主面２ａと第２主面２ｂは、単曲面（ｓｉｎｇｌｅ ｃｕｒｖｅｄ ｓｕｒｆａｃｅ）を含んでもよいし、複曲面（ｄｏｕｂｌｅ ｃｕｒｖｅｄ ｓｕｒｆａｃｅ）を含んでもよい。曲面の曲率半径は、５０ｍｍ以上が好ましく、１００ｍｍ以上がより好ましく、２００ｍｍ以上が更に好ましい。曲面の曲率半径は、例えば１００００ｍｍ以下であり、好ましく５０００ｍｍ以下であり、より好ましくは３０００ｍｍ以下である。 The first main surface 2a and the second main surface 2b after molding may include a single curved surface or a double curved surface. The curvature radius of the curved surface is preferably 50 mm or more, more preferably 100 mm or more, and even more preferably 200 mm or more. The curvature radius of the curved surface is, for example, 10000 mm or less, preferably 5000 mm or less, and more preferably 3000 mm or less.

成形後のガラス板２は、例えば自動車に搭載される。ガラス板２の用途は、例えばウィンドシールド、ヘッドアップディスプレイ、ダッシュボード、表示装置用カバーガラス、カメラ用カバーガラス、レーダー用カバーガラス、又はセンサ用カバーガラスなどである。フロントウィンドシールドは、全体的に又は部分的に車外側に凸に湾曲する。車載用表示装置のカバーガラスには、近年意匠性の観点から複雑な曲げ形状と高い面品質が求められており、本開示の技術を適用する意義が大きい。 The glass plate 2 after molding is mounted, for example, on an automobile. Applications of the glass plate 2 include, for example, windshields, head-up displays, dashboards, cover glasses for display devices, cover glasses for cameras, cover glasses for radars, and cover glasses for sensors. The front windshield is wholly or partially curved convexly outwardly of the vehicle. In recent years, from the viewpoint of design, a cover glass for an in-vehicle display device is required to have a complicated bent shape and high surface quality, and the application of the technology of the present disclosure is significant.

図２に示すように、成形装置１は、例えば、下型１０と、押さえ部２０と、支持部３０と、を備える。下型１０は、ガラス板２の第１主面２ａと向かい合った状態で、ガラス板２を支持する。下型１０の上面１０ａは、ガラス板２の第１主面２ａの全体を支持することもできるが、第１主面２ａの一部のみ（例えば周縁部のみ）を支持してもよい。下型１０の上面１０ａは、曲面を含む。押さえ部２０は、下型１０で支持されているガラス板２の第２主面２ｂに向かい合うように第２主面２ｂを押さえる。下型１０は、例えば、押さえ部２０に対して鉛直下方向に設置されることができる。支持部３０は、下型１０に対して押さえ部２０を昇降自在に支持する。 As shown in FIG. 2, the molding apparatus 1 includes, for example, a lower mold 10, a pressing portion 20, and a support portion 30. As shown in FIG. The lower mold 10 supports the glass plate 2 while facing the first main surface 2a of the glass plate 2 . The upper surface 10a of the lower mold 10 can support the entire first main surface 2a of the glass plate 2, but may support only a portion of the first main surface 2a (for example, only the peripheral portion). The upper surface 10a of the lower mold 10 includes a curved surface. The pressing part 20 presses the second main surface 2b of the glass plate 2 supported by the lower mold 10 so as to face the second main surface 2b. The lower mold 10 can be installed vertically downward with respect to the pressing portion 20, for example. The support portion 30 supports the pressing portion 20 so as to move up and down with respect to the lower mold 10 .

支持部３０は、例えば支持軸３１を含む。支持軸３１は、例えば下型１０に対して昇降不能に設置される。支持軸３１は、例えば水平に設置され、支持軸３１を中心に押さえ部２０を回転自在に支持することで押さえ部２０を昇降自在に支持する。押さえ部２０の上下方向における可動範囲は、ガラス板２の最大変形量よりも大きいことが好ましい。 The support portion 30 includes a support shaft 31, for example. The support shaft 31 is installed, for example, so as not to move up and down with respect to the lower die 10 . The support shaft 31 is installed horizontally, for example, and rotatably supports the pressing portion 20 around the support shaft 31 to support the pressing portion 20 so that the pressing portion 20 can move up and down. It is preferable that the movable range of the pressing portion 20 in the vertical direction is larger than the maximum amount of deformation of the glass plate 2 .

なお、支持部３０は、支持軸３１の代わりに、図示しないガイド部を含んでもよい。ガイド部は、例えばガイド穴またはガイドピンなどである。ガイド部は直線状であることが好ましく、押さえ部２０はガイド部に沿って昇降自在である。押さえ部２０の上下方向における可動範囲がガラス板２の最大変形量よりも大きくなるように、ガイド部の上下方向寸法はガラス板２の最大変形量よりも大きいことが好ましい。 Note that the support portion 30 may include a guide portion (not shown) instead of the support shaft 31 . The guide part is, for example, a guide hole or a guide pin. The guide portion is preferably linear, and the pressing portion 20 can move up and down along the guide portion. The vertical dimension of the guide portion is preferably larger than the maximum deformation amount of the glass plate 2 so that the vertical movable range of the pressing portion 20 is larger than the maximum deformation amount of the glass plate 2 .

図１に示すように、押さえ部２０は、ガラス板２の第２主面２ｂの一部のみに設置され且つ第２主面２ｂの周縁部に設置され、押さえ部２０の重さで第２主面２ｂを押さえる。第２主面２ｂの周縁部とは、第２主面２ｂの周縁から５０ｍｍ以内の部分を意味する。従来の重力曲げ成形では、ガラス板２の周縁部に作用する曲げモーメントがガラス板２の中央部に作用する曲げモーメントに比べて小さく、ガラス板の面精度が低かった。本実施形態によれば、昇降自在な押さえ部２０の重さでガラス板２の第２主面２ｂの周縁部を押さえることで、成形後のガラス板２の面精度を向上できる。
なお、「押さえ部２０の重さで第２主面２ｂを押さえる」とは、押さえ部２０の自重によって第２主面２ｂを押さえることであり、第２主面２ｂを押さえるのに付勢手段は無くても良い。
なお、押さえ部２０は、周縁部のみに設置されてもよいし、周縁部に加え、周縁部以外に設置されてもよいが、ガラス板２の第２主面２ｂの一部には、押さえ部２０が設置されていない領域が存在する。 As shown in FIG. 1, the pressing portion 20 is installed only on a part of the second main surface 2b of the glass plate 2 and is installed on the peripheral edge portion of the second main surface 2b. The main surface 2b is pressed. The peripheral portion of the second main surface 2b means a portion within 50 mm from the peripheral edge of the second main surface 2b. In conventional gravity bending, the bending moment acting on the peripheral portion of the glass plate 2 is smaller than the bending moment acting on the central portion of the glass plate 2, and the surface accuracy of the glass plate is low. According to the present embodiment, the weight of the pressing portion 20 that can move up and down presses the peripheral portion of the second main surface 2b of the glass plate 2, so that the surface accuracy of the glass plate 2 after molding can be improved.
It should be noted that "pressing the second main surface 2b with the weight of the pressing part 20" means pressing the second main surface 2b with the own weight of the pressing part 20, and the biasing means is used to press the second main surface 2b. can be omitted.
The pressing portion 20 may be installed only on the peripheral edge portion, or may be installed on the peripheral edge portion as well as on a portion other than the peripheral edge portion. There is an area where the unit 20 is not installed.

押さえ部２０は、ガラス板２の第２主面２ｂの周縁部（好ましくは曲げ成形によって上下方向に高低差が生じる辺（本実施形態では長辺）から５０ｍｍ以内の部分）に設置されていればよく、第２主面２ｂの中央部にも設置されていてもよい。いずれにしろ、押さえ部２０は、第２主面２ｂの一部のみに設置されていればよく、第２主面２ｂの全てを覆わない。言い換えれば、第２主面２ｂの一部に押さえ部２０が設置されていない領域を有する。第２主面２ｂの所望の領域に押さえ部２０の重さを集中でき、所望の領域を精度良く曲げることができる。また、第２主面２ｂの押さえ部２０が設置されていない領域をランプヒータなど非接触方式で加熱することも可能であり、生産設備の簡略化が可能である。なお、加熱源の種類は特に限定されない。 The pressing portion 20 is installed at the peripheral portion of the second main surface 2b of the glass plate 2 (preferably within 50 mm from the side (the long side in this embodiment) where there is a difference in height in the vertical direction due to bending). However, it may also be installed in the central portion of the second main surface 2b. In any case, the holding part 20 only needs to be installed on a part of the second main surface 2b, and does not cover the entire second main surface 2b. In other words, a part of the second principal surface 2b has a region where the pressing portion 20 is not installed. The weight of the pressing portion 20 can be concentrated on a desired area of the second main surface 2b, and the desired area can be bent with high accuracy. Moreover, it is also possible to heat the area of the second main surface 2b where the pressing part 20 is not installed by a non-contact method such as a lamp heater, and simplification of the production equipment is possible. Note that the type of heat source is not particularly limited.

押さえ部２０は、押さえ部２０の重さでガラス板２の第２主面２ｂを押さえる。それゆえ、プレス機構が不要である。プレス機構を用いるとすると、プレス機構は、例えば連続搬送式の加熱炉の特定のゾーンに設けられる。この場合、プレス機構とガラス板２との位置合わせが必要になってしまう。本実施形態によれば、成形装置１はガラス板２と共に加熱炉の内部を搬送されるので、位置合わせが不要である。 The pressing portion 20 presses the second main surface 2 b of the glass plate 2 with the weight of the pressing portion 20 . Therefore, no press mechanism is required. If a press mechanism is used, the press mechanism is provided, for example, in a specific zone of a continuous-conveying heating furnace. In this case, it becomes necessary to align the press mechanism and the glass plate 2 . According to this embodiment, since the molding apparatus 1 is conveyed inside the heating furnace together with the glass plate 2, alignment is unnecessary.

押さえ部２０がガラス板２の第２主面２ｂを押さえる圧力は、好ましくは０．１ｋＰａ～１．０×１０６ｋＰａである。圧力が０．１ｋＰａ以上であれば、所望の領域を精度良く曲げることができる。圧力が１．０×１０６ｋＰａ以下であれば、押さえ部２０の痕がガラス板２に付くのを抑制できる。 The pressure with which the pressing part 20 presses the second main surface 2b of the glass plate 2 is preferably 0.1 kPa to 1.0×10 6 kPa. If the pressure is 0.1 kPa or more, the desired region can be bent with high accuracy. If the pressure is 1.0×10 6 kPa or less, it is possible to suppress marks from the pressing portion 20 on the glass plate 2 .

図１に示すように、押さえ部２０は、例えばプレート２１を含む。プレート２１は、鉛直に設置されることができ、下面２１ａに曲面を含むことができる。プレート２１は、ガラス板２の一対の長辺の各々に沿って設置されることができる。一対のプレート２１は、水平な複数の連結棒２２で連結されることができる。各連結棒２２は、支持軸３１に対して平行に設置されることができる。 As shown in FIG. 1, the pressing portion 20 includes a plate 21, for example. The plate 21 can be installed vertically and can include a curved surface on the lower surface 21a. A plate 21 can be installed along each of the pair of long sides of the glass plate 2 . A pair of plates 21 can be connected by a plurality of horizontal connecting rods 22 . Each connecting rod 22 can be installed parallel to the support shaft 31 .

押さえ部２０は、一対の第２プレート２３を含んでもよい。一対の第２プレート２３は、一対のプレート２１を挟んで設置されることができる。プレート２１がガラス板２の第２主面２ｂを押さえるのに対し、一対の第２プレート２３はガラス板２の第２主面２ｂを押さえない。一対の第２プレート２３は、複数の連結棒２２と複数の第２連結棒２４とで連結されることができる。第２連結棒２４は、連結棒２２と同様に支持軸３１に対して平行に設置されることができるが、連結棒２２とは異なり一対のプレート２１よりも上方に設置され、一対のプレート２１を連結しないことが好ましい。 The pressing portion 20 may include a pair of second plates 23 . The pair of second plates 23 can be installed with the pair of plates 21 interposed therebetween. While the plate 21 presses the second main surface 2 b of the glass plate 2 , the pair of second plates 23 does not press the second main surface 2 b of the glass plate 2 . A pair of second plates 23 may be connected by a plurality of connecting rods 22 and a plurality of second connecting rods 24 . The second connecting rod 24 can be installed parallel to the support shaft 31 like the connecting rod 22 , but unlike the connecting rod 22 , it is installed above the pair of plates 21 and are preferably not concatenated.

支持軸３１は、一対の第２プレート２３を回転自在に支持することで、一対のプレート２１を回転自在に支持することができる。支持軸３１は、一対の第２プレート２３の長手方向一端部を回転自在に支持することができるが、一対の第２プレート２３の長手方向中央部を回転自在に支持してもよい。上方から見たときに、支持軸３１は、ガラス板２の短辺に対して平行に配置されることが好ましい。上方から見たときに、支持軸３１は、ガラス板２と重ならないように設置されることができるが、ガラス板２と重なるように設置されてもよい。 The support shaft 31 can rotatably support the pair of plates 21 by rotatably supporting the pair of second plates 23 . The support shaft 31 can rotatably support one longitudinal end of the pair of second plates 23 , but may rotatably support the longitudinal center of the pair of second plates 23 . The support shaft 31 is preferably arranged parallel to the short sides of the glass plate 2 when viewed from above. The support shaft 31 can be installed so as not to overlap the glass plate 2 when viewed from above, but may be installed so as to overlap the glass plate 2 .

一対のプレート２１と複数の連結棒２２と一対の第２プレート２３と複数の第２連結棒２４とで、押さえ部２０が構成されることができる。なお、押さえ部２０は一対の第２プレート２３と複数の第２連結棒２４とを含まなくてもよく、支持軸３１はプレート２１を直接に回転自在に支持してもよい。支持軸３１の代わりに、図示しないガイド部が押さえ部２０を昇降自在に支持してもよい。 A pair of plates 21 , a plurality of connecting rods 22 , a pair of second plates 23 , and a plurality of second connecting rods 24 can constitute pressing portion 20 . Note that the pressing portion 20 may not include the pair of second plates 23 and the plurality of second connecting rods 24, and the support shaft 31 may directly rotatably support the plate 21. As shown in FIG. Instead of the support shaft 31, a guide portion (not shown) may support the pressing portion 20 so as to move up and down.

なお、下型１０とガラス板２の間に、図示しない耐熱布が敷かれてもよい。耐熱布は、ガラス板２と押さえ部２０との間に、敷かれてもよい。耐熱布は、例えばステンレス鋼繊維又はシリカ繊維を含む。耐熱布は、織布でもよいし不織布でもよい。耐熱布を敷くことで、下型１０または押さえ部２０の痕がガラス板２に付くのを抑制できる。下記の変形例において同様である。 A heat-resistant cloth (not shown) may be laid between the lower mold 10 and the glass plate 2 . A heat-resistant cloth may be laid between the glass plate 2 and the pressing portion 20 . Heat-resistant fabrics include, for example, stainless steel fibers or silica fibers. The heat-resistant cloth may be a woven cloth or a non-woven cloth. By laying the heat-resistant cloth, it is possible to prevent the glass plate 2 from being marked by the lower mold 10 or the pressing part 20 . The same applies to the following modified examples.

次に、図３と図４を参照して、第１変形例に係る成形装置１について説明する。以下、本変形例と上記実施形態の相違点について主に説明する。本変形例の押さえ部２０は第２主面２ｂに複数設置され、複数の押さえ部２０はそれぞれ独立に昇降自在であってそれぞれ独立にガラス板２の第２主面２ｂを押さえる。複数の押さえ部２０は、それぞれ同じ圧力で第２主面２ｂを押さえてもよいし、それぞれ異なる圧力で第２主面２ｂを押さえてもよい。 Next, a molding apparatus 1 according to a first modified example will be described with reference to FIGS. 3 and 4. FIG. Differences between this modified example and the above-described embodiment will be mainly described below. A plurality of pressing portions 20 of this modification are installed on the second main surface 2b, and each of the plurality of pressing portions 20 can move up and down independently to press the second main surface 2b of the glass plate 2 independently. The plurality of pressing portions 20 may press the second main surface 2b with the same pressure, or may press the second main surface 2b with different pressures.

押さえ部２０は、例えばガラス板２の長辺に沿って間隔をおいて複数設置される。複数の押さえ部２０は、それぞれ独立に昇降自在であるので、図３（Ａ）と図３（Ｂ）に示すように成形前から成形後まで第２主面２ｂを押さえ続けることができ、図２（Ａ）に示すような成形前の荷重の集中を抑制できる。また、押さえ部２０の配置を調整することで荷重の分布を調整できる。これらによって、成形後のガラス板２の面精度を向上できる。 A plurality of pressing portions 20 are installed at intervals along the long side of the glass plate 2, for example. Since the plurality of pressing portions 20 can move up and down independently of each other, the second main surface 2b can be continuously pressed from before molding to after molding as shown in FIGS. Concentration of load before molding as shown in 2(A) can be suppressed. In addition, the distribution of the load can be adjusted by adjusting the arrangement of the pressing portion 20 . By these, the surface precision of the glass plate 2 after molding can be improved.

押さえ部２０が複数設置される場合、複数の押さえ部２０の少なくとも一部は、例えば回転軸２５を中心に回転自在なコロ２６を含む。回転軸２５の軸方向からコロ２６を見たときに、コロ２６は、回転軸２５の中心線からの距離が一定である外周面２６ａを有することが好ましい。コロ２６の外周面２６ａは、例えば円周面である。コロ２６は、その外周面２６ａでガラス板２の第２主面２ｂを押さえる。コロ２６は、回転ヘッドの一例である。 When a plurality of pressing portions 20 are installed, at least a portion of the pressing portions 20 include rollers 26 that are rotatable around a rotating shaft 25, for example. When the rollers 26 are viewed from the axial direction of the rotating shaft 25, it is preferable that the rollers 26 have an outer peripheral surface 26a whose distance from the center line of the rotating shaft 25 is constant. The outer peripheral surface 26a of the roller 26 is, for example, a circumferential surface. The roller 26 presses the second main surface 2b of the glass plate 2 with its outer peripheral surface 26a. Roller 26 is an example of a rotating head.

なお、回転ヘッドとして、コロ２６の代わりに、例えば扇形の板が用いられてもよい。回転軸２５の軸方向から扇形の板を見たときに、扇形の板も、コロ２６と同様に、回転軸２５の中心線からの距離が一定である外周面を有し、その外周面でガラス板２の第２主面２ｂを押さえることができる。これは、図５に示す第２変形例、図６に示す第３変形例、図７に示す第４変形例、および図８に示す第５変形例において同様である。 A fan-shaped plate, for example, may be used instead of the roller 26 as the rotary head. When the fan-shaped plate is viewed from the axial direction of the rotating shaft 25, the fan-shaped plate also has an outer peripheral surface at a constant distance from the center line of the rotating shaft 25, similar to the rollers 26. The second main surface 2b of the glass plate 2 can be pressed. This is the same for the second modification shown in FIG. 5, the third modification shown in FIG. 6, the fourth modification shown in FIG. 7, and the fifth modification shown in FIG.

ところで、例えば図３（Ａ）と図３（Ｂ）に示すようにガラス板２の長辺が下に凸に変形する場合、ガラス板２の水平方向寸法がＬｂｅｆｏｒｅからＬａｆｔｅｒ（Ｌａｆｔｅｒ＜Ｌｂｅｆｏｒｅ）に変化する。このように、成形前と成形後で、ガラス板２の水平方向寸法が変化することがある。 By the way, for example, when the long side of the glass plate 2 is deformed to be convex downward as shown in FIGS. 3A and 3B, the horizontal dimension of the glass plate 2 changes from L before to L after (L after < L before ). Thus, the horizontal dimension of the glass plate 2 may change before and after molding.

コロ２６は、ガラス板２の水平方向寸法の変化に応じて、ガラス板２との摩擦力によって回転軸２５を中心に回転する。これにより、コロ２６とガラス板２の摩擦力がガラス板２の水平方向寸法の変化を妨げるのを抑制できる。従って、成形後のガラス板２の面精度を向上できる。複数のコロ２６に対応して複数の回転軸２５が設置され、複数の回転軸２５は複数のコロ２６を回転自在に支持する。 The roller 26 rotates around the rotating shaft 25 by the frictional force with the glass plate 2 according to the change in the horizontal dimension of the glass plate 2 . Thereby, it is possible to suppress the frictional force between the rollers 26 and the glass plate 2 from hindering the change in the horizontal dimension of the glass plate 2 . Therefore, the surface precision of the glass plate 2 after molding can be improved. A plurality of rotating shafts 25 are installed corresponding to the plurality of rollers 26, and the plurality of rotating shafts 25 support the plurality of rollers 26 so as to be rotatable.

コロ２６は、例えば回転軸２５に対して平行な支持軸３１を中心に回転することで、下型１０に対して昇降する。回転軸２５がアーム２７の一端に設置され、支持軸３１がアーム２７の他端に設置される。コロ２６の上下方向における可動範囲がガラス板２の最大変形量よりも大きくなるように、アーム２７の長さが設定される。 The roller 26 moves up and down with respect to the lower die 10 by rotating around a support shaft 31 parallel to the rotating shaft 25, for example. A rotating shaft 25 is installed at one end of the arm 27 and a support shaft 31 is installed at the other end of the arm 27 . The length of the arm 27 is set so that the movable range of the roller 26 in the vertical direction is larger than the maximum amount of deformation of the glass plate 2 .

図３（Ａ）と図３（Ｂ）に示すように、支持軸３１の軸方向からコロ２６を見たときに、コロ２６は支持軸３１を中心に反時計回りに回転してもよいし、時計回りに回転してもよい。反時計回りに回転するコロ２６と、時計回りに回転するコロ２６とが線対称に配置されてもよい。複数の支持軸３１は、鉛直な支持プレート３２に設けられている。 As shown in FIGS. 3A and 3B, when the rollers 26 are viewed from the axial direction of the support shaft 31, the rollers 26 may rotate counterclockwise around the support shaft 31. , may rotate clockwise. The counterclockwise rotating roller 26 and the clockwise rotating roller 26 may be arranged line-symmetrically. A plurality of support shafts 31 are provided on a vertical support plate 32 .

回転軸２５と支持軸３１とが平行な場合、複数の回転軸２５に対応して複数の支持軸３１が設置される。複数の支持軸３１は、複数のアーム２７を介して複数のコロ２６をそれぞれ独立に昇降自在に支持する。複数の支持軸３１は、複数のコロ２６及び複数のアーム２７と干渉しないように設置される。 When the rotation shafts 25 and the support shafts 31 are parallel, a plurality of support shafts 31 are installed corresponding to the plurality of rotation shafts 25 . The plurality of support shafts 31 support the plurality of rollers 26 through the plurality of arms 27 so as to be independently movable up and down. The multiple support shafts 31 are installed so as not to interfere with the multiple rollers 26 and the multiple arms 27 .

支持軸３１は、図３と図４に示すように回転軸２５に対して平行であってもよく、図５に示すように回転軸２５に直交していてもよい。この場合、図５に示すように、１つの支持軸３１が、複数の回転軸２５をそれぞれ独立に回転自在に支持することで、複数のコロ２６をそれぞれ独立に昇降自在に支持してもよい。これにより、アーム２７が不要になる。また、支持軸３１の数を低減できる。 The support shaft 31 may be parallel to the rotation axis 25 as shown in FIGS. 3 and 4, or orthogonal to the rotation axis 25 as shown in FIG. In this case, as shown in FIG. 5, one support shaft 31 may independently rotatably support the plurality of rotating shafts 25, thereby independently supporting the plurality of rollers 26 so as to be vertically movable. . This makes the arm 27 unnecessary. Also, the number of support shafts 31 can be reduced.

図５に示すように、支持軸３１が回転軸２５に直交する場合、支持軸３１は櫛歯ブロック３３で支持されてもよい。櫛歯ブロック３３は、支持軸３１の軸方向に間隔をおいて並ぶ複数の歯部３３ａを有する。各歯部３３ａが支持軸３１を支持しており、隣り合う歯部３３ａ同士の間に回転軸２５が配置される。 As shown in FIG. 5 , when the support shaft 31 is perpendicular to the rotating shaft 25 , the support shaft 31 may be supported by comb-tooth blocks 33 . The comb-tooth block 33 has a plurality of tooth portions 33 a arranged at intervals in the axial direction of the support shaft 31 . Each tooth portion 33a supports the support shaft 31, and the rotating shaft 25 is arranged between adjacent tooth portions 33a.

図４および図５に示すコロ２６は、支持軸３１を中心に回転することで、下型１０に対して昇降する。これに対して、図６～図８に示すコロ２６は、直線状のガイド部に沿って下型１０に対して昇降する。ガイド部が用いられる場合、アーム２７が不要になるので、部品点数が少なくて済む。一方、支持軸３１が用いられる場合、温度変化によるカジリがほとんど発生せず、コロ２６が円滑に昇降する。 The rollers 26 shown in FIGS. 4 and 5 move up and down with respect to the lower die 10 by rotating around the support shaft 31 . On the other hand, the rollers 26 shown in FIGS. 6 to 8 move up and down with respect to the lower die 10 along linear guide portions. When the guide portion is used, the arm 27 becomes unnecessary, so the number of parts can be reduced. On the other hand, when the support shaft 31 is used, the rollers 26 move up and down smoothly with almost no scuffing due to temperature changes.

図６および図７に示す支持部３０は、鉛直な支持プレート３４と、支持プレート３４に形成されるガイド穴３５と、を含む。ガイド穴３５は、ガイド部の一例であり、回転軸２５をガイドする。回転軸２５は、ガイド穴３５に挿入されており、ガイド穴３５に沿って昇降する。ガイド穴３５は、図６に示すように鉛直に形成されてもよいし、図７に示すように斜めに形成されてもよい。また、ガイド穴３５は、円弧状であってもよいし、曲線状であってもよい。 The support portion 30 shown in FIGS. 6 and 7 includes a vertical support plate 34 and guide holes 35 formed in the support plate 34 . The guide hole 35 is an example of a guide portion and guides the rotating shaft 25 . The rotating shaft 25 is inserted into the guide hole 35 and moves up and down along the guide hole 35 . The guide hole 35 may be formed vertically as shown in FIG. 6, or may be formed obliquely as shown in FIG. Also, the guide hole 35 may be arcuate or curved.

図８に示す支持部３０は、水平な支持プレート３６と、支持プレート３６の下面から下方に突出するガイドピン３７と、を含む。ガイドピン３７は、ガイド部の一例であり、回転軸２５をガイドする。回転軸２５は、ガイドピン３７が挿通される挿通穴を有し、ガイドピン３７に沿って昇降する。ガイドピン３７は、図８に示すように鉛直に設置されてもよいし、図示しないが斜めに設置されてもよい。ガイドピン３７の下端には、図示しないストッパが設けられてもよい。 The support portion 30 shown in FIG. 8 includes a horizontal support plate 36 and guide pins 37 protruding downward from the lower surface of the support plate 36 . The guide pin 37 is an example of a guide portion and guides the rotating shaft 25 . The rotating shaft 25 has an insertion hole through which the guide pin 37 is inserted, and moves up and down along the guide pin 37 . The guide pin 37 may be installed vertically as shown in FIG. 8, or may be installed obliquely (not shown). A stopper (not shown) may be provided at the lower end of the guide pin 37 .

なお、上記第１変形例～上記第５変形例の押さえ部２０はコロ２６などの回転ヘッドを含むが、複数の押さえ部２０は回転ヘッドを含まなくてもよい。複数の押さえ部２０がそれぞれ独立に昇降自在であれば、成形前に荷重が集中するのを抑制でき、また、荷重の分布を調整できるので、成形後のガラス板２の面精度を向上できる。 In addition, although the pressing portions 20 in the first to fifth modifications include rotating heads such as the rollers 26, the plurality of pressing portions 20 may not include rotating heads. If the plurality of pressing portions 20 can move up and down independently, it is possible to suppress the concentration of load before molding, and the distribution of the load can be adjusted, so that the surface accuracy of the glass plate 2 after molding can be improved.

次に、実験データについて説明する。例１～例３では、表１に示す条件以外（つまり成形装置以外）、同じ条件でガラス板の曲げ成形を実施した。ガラス板は、アルミノシリケートガラスであった。曲げ成形前のガラス板は、長手方向寸法が８００ｍｍであり、幅方向寸法が１４５ｍｍであり、厚みが１．３ｍｍであった。曲げ成形後のガラス板の上面の目標曲面は、単曲面であった。その単曲面は、ガラス板の幅方向に垂直な断面において曲率半径２４００ｍｍの下に凸な曲線であり、ガラス板の長手方向に垂直な断面において直線であった。例１～例２が実施例であり、例３が比較例である。例１では図１と図２に示す成形装置１を用い、例２では図３と図４に示す成形装置１を用い、例３では押さえ部を備えずに下型のみを備える成形装置（不図示）を用いた。例３では、重力曲げ成形によってガラス板の曲げ成形を実施した。表１に、条件と結果を示す。 Next, experimental data will be described. In Examples 1 to 3, the glass sheets were bent under the same conditions except for the conditions shown in Table 1 (that is, except for the forming apparatus). The glass plate was aluminosilicate glass. The glass plate before bending had a longitudinal dimension of 800 mm, a width dimension of 145 mm, and a thickness of 1.3 mm. The target curved surface of the upper surface of the glass plate after bending was a single curved surface. The single curved surface was a downward convex curve with a radius of curvature of 2400 mm in a cross section perpendicular to the width direction of the glass plate, and a straight line in a cross section perpendicular to the longitudinal direction of the glass plate. Examples 1 and 2 are working examples, and example 3 is a comparative example. Example 1 uses the molding apparatus 1 shown in FIGS. 1 and 2, Example 2 uses the molding apparatus 1 shown in FIGS. shown) was used. In Example 3, the glass sheets were bent by gravity bending. Table 1 shows the conditions and results.

Figure 2023110893000002
Figure 2023110893000002

表１において、ＰＶ（Ｐｅａｋ ｔｏ Ｖａｌｌｅｙ）値は、実際の曲面と目標曲面との偏差の最大高低差であり、ｇｏｍ社製の３次元計測機ＡＴＯＳ（型番：ＡＴＯＳ Ｔｒｉｐｌｅ ｓｃａｎ ＩＩＩ）を用いて測定した。ＰＶ値が小さいほど、誤差が小さく、面精度が良い。 In Table 1, the PV (Peak to Valley) value is the maximum height difference between the actual curved surface and the target curved surface, and is measured using a three-dimensional measuring machine ATOS (model number: ATOS Triple scan III) manufactured by gom. bottom. The smaller the PV value, the smaller the error and the better the surface accuracy.

表１に示すように、例１及び例２では、例３とは異なり押さえ部によってガラス板の上面の周縁部を押さえたので、例３に比べて成形後のガラス板の面精度を向上できた。また、例２では、例１とは異なり複数の押さえ部を独立に昇降させたので、例１に比べて成形後のガラス板の面精度をさらに向上できた。 As shown in Table 1, in Examples 1 and 2, unlike Example 3, the peripheral portion of the upper surface of the glass plate was pressed by the pressing portion. rice field. In addition, in Example 2, unlike Example 1, a plurality of pressing portions were independently moved up and down.

以上、本開示に係るガラス板の製造方法、及びガラス板の成形装置について説明したが、本開示は上記実施形態などに限定されない。特許請求の範囲に記載された範疇内において、各種の変更、修正、置換、付加、削除、及び組み合わせが可能である。それらについても当然に本開示の技術的範囲に属する。 Although the glass sheet manufacturing method and the glass sheet molding apparatus according to the present disclosure have been described above, the present disclosure is not limited to the above embodiments. Various changes, modifications, substitutions, additions, deletions, and combinations are possible within the scope of the claims. These also naturally belong to the technical scope of the present disclosure.

本発明を詳細にまた特定の実施態様を参照して説明したが、本発明の精神と範囲を逸脱することなく様々な変更や修正を加えることができることは当業者にとって明らかである。本出願は２０２２年１月２８日出願の日本特許出願（特願２０２２－０１２１２３）に基づくものであり、その内容はここに参照として取り込まれる。 Although the present invention has been described in detail and with reference to specific embodiments, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the invention. This application is based on a Japanese patent application (Japanese Patent Application No. 2022-012123) filed on January 28, 2022, the content of which is hereby incorporated by reference.

１ 成形装置
２ ガラス板
２ａ 第１主面
２ｂ 第２主面
１０ 下型
２０ 押さえ部
３０ 支持部 1 Forming Device 2 Glass Plate 2a First Main Surface 2b Second Main Surface 10 Lower Mold 20 Pressing Part 30 Supporting Part

Claims (14)

第１主面と前記第１主面とは反対向きの第２主面とを含み、前記第１主面と前記第２主面に曲面を含む、ガラス板の製造方法であって、
前記ガラス板の前記第１主面が曲面を含む下型に向かい合うように、前記ガラス板を設置することと、
前記下型で支持されている前記ガラス板の前記第２主面に向かい合うように、押さえ部を設置することと、
前記ガラス板を加熱することと、
を有し、
前記押さえ部は、昇降自在であって、前記第２主面の一部のみに設置され且つ前記第２主面の周縁部に設置され、前記押さえ部の重さで前記第２主面を押さえ、前記加熱の際には、前記第２主面の一部のみかつ周縁部を押さえた状態である、ガラス板の製造方法。 A method for manufacturing a glass plate including a first principal surface and a second principal surface opposite to the first principal surface, wherein the first principal surface and the second principal surface include curved surfaces,
placing the glass plate so that the first main surface of the glass plate faces a lower mold including a curved surface;
installing a holding part so as to face the second main surface of the glass plate supported by the lower mold;
heating the glass plate;
has
The pressing portion is vertically movable, is installed only on a part of the second main surface and is installed on the peripheral edge of the second main surface, and presses the second main surface with the weight of the pressing portion. and a method for producing a glass plate, wherein only a portion of the second main surface and a peripheral portion thereof are pressed during the heating. 前記押さえ部は前記第２主面に複数設置され、複数の前記押さえ部はそれぞれ独立に昇降自在であって、それぞれ独立に前記第２主面を押さえる、請求項１に記載のガラス板の製造方法。 2. The manufacturing of the glass sheet according to claim 1, wherein a plurality of said pressing portions are provided on said second main surface, and each of said plurality of pressing portions is independently movable up and down, and each independently presses said second main surface. Method. 複数の前記押さえ部の少なくとも一部は、回転軸を中心に回転自在な回転ヘッドを含み、
前記回転軸の軸方向から前記回転ヘッドを見たときに、前記回転ヘッドは、前記回転軸の中心線からの距離が一定である外周面を有し、前記外周面で前記第２主面を押さえる、請求項２に記載のガラス板の製造方法。 At least part of the plurality of pressing portions includes a rotating head rotatable around a rotating shaft,
When the rotating head is viewed from the axial direction of the rotating shaft, the rotating head has an outer peripheral surface at a constant distance from the center line of the rotating shaft, and the outer peripheral surface defines the second main surface. The method for manufacturing a glass plate according to claim 2, wherein the glass plate is pressed. 前記回転ヘッドは、前記回転軸に対して平行な支持軸を中心に回転することで、前記下型に対して昇降する、請求項３に記載のガラス板の製造方法。 The method for manufacturing a glass plate according to claim 3, wherein the rotating head moves up and down with respect to the lower mold by rotating around a support shaft parallel to the rotating shaft. 前記回転ヘッドは、前記回転軸に直交する支持軸を中心に回転することで、前記下型に対して昇降する、請求項３に記載のガラス板の製造方法。 The method for manufacturing a glass plate according to claim 3, wherein the rotating head moves up and down with respect to the lower mold by rotating around a support shaft orthogonal to the rotating shaft. 前記回転ヘッドは、前記回転軸をガイドする直線状のガイド部に沿って、前記下型に対して昇降する、請求項３に記載のガラス板の製造方法。 4. The method of manufacturing a glass plate according to claim 3, wherein the rotating head moves up and down with respect to the lower mold along a linear guide portion that guides the rotating shaft. 前記押さえ部が前記第２主面を押さえる圧力は、０．１ｋＰａ～１．０×１０６ｋＰａである、請求項１に記載のガラス板の製造方法。 2. The method for manufacturing a glass plate according to claim 1, wherein the pressing portion presses the second main surface under a pressure of 0.1 kPa to 1.0×10 6 kPa. 第１主面と前記第１主面とは反対向きの第２主面とを含み、前記第１主面と前記第２主面に曲面を含む、ガラス板の成形装置であって、
前記ガラス板の前記第１主面と向かい合うように、前記ガラス板を支持する下型と、
前記下型で支持されている前記ガラス板の前記第２主面と向かい合う押さえ部と、
前記下型に対して前記押さえ部を昇降自在に支持する支持部と、
を備え、
前記押さえ部は、前記第２主面の一部のみに設置され且つ前記第２主面の周縁部に設置され、前記押さえ部の重さで前記第２主面を押さえる、ガラス板の成形装置。 A glass sheet forming apparatus comprising a first principal surface and a second principal surface opposite to the first principal surface, wherein the first principal surface and the second principal surface include curved surfaces,
a lower mold for supporting the glass plate so as to face the first main surface of the glass plate;
a pressing portion facing the second main surface of the glass plate supported by the lower mold;
a support part that supports the pressing part so that it can move up and down with respect to the lower mold;
with
The pressing part is installed only on a part of the second main surface and is installed on the peripheral edge of the second main surface, and presses the second main surface with the weight of the pressing part. . 前記押さえ部は前記第２主面に複数設置され、複数の前記押さえ部はそれぞれ独立に昇降自在であって、それぞれ独立に前記第２主面を押さえる、請求項８に記載のガラス板の成形装置。 9. The molding of the glass sheet according to claim 8, wherein a plurality of said pressing portions are provided on said second main surface, and each of said plurality of pressing portions is independently movable up and down, and each independently presses said second main surface. Device. 複数の前記押さえ部の少なくとも一部は、回転軸を中心に回転自在な回転ヘッドを含み、
前記回転軸の軸方向から前記回転ヘッドを見たときに、前記回転ヘッドは、前記回転軸の中心線からの距離が一定である外周面を有し、前記外周面で前記第２主面を押さえる、請求項９に記載のガラス板の成形装置。 At least part of the plurality of pressing portions includes a rotating head rotatable around a rotating shaft,
When the rotating head is viewed from the axial direction of the rotating shaft, the rotating head has an outer peripheral surface at a constant distance from the center line of the rotating shaft, and the outer peripheral surface defines the second main surface. 10. The apparatus for forming a glass sheet according to claim 9, which presses. 前記回転ヘッドは、前記回転軸に対して平行な支持軸を中心に回転することで、前記下型に対して昇降する、請求項１０に記載のガラス板の成形装置。 11. The apparatus for forming a glass sheet according to claim 10, wherein said rotating head moves up and down with respect to said lower mold by rotating around a support shaft parallel to said rotating shaft. 前記回転ヘッドは、前記回転軸に直交する支持軸を中心に回転することで、前記下型に対して昇降する、請求項１０に記載のガラス板の成形装置。 11. The apparatus for forming a glass sheet according to claim 10, wherein said rotating head moves up and down with respect to said lower mold by rotating around a support shaft orthogonal to said rotating shaft. 前記回転ヘッドは、前記回転軸をガイドする直線状のガイド部に沿って、前記下型に対して昇降する、請求項１０に記載のガラス板の成形装置。 11. The apparatus for forming a glass sheet according to claim 10, wherein the rotating head moves up and down with respect to the lower mold along a linear guide portion that guides the rotating shaft. 前記押さえ部が前記第２主面を押さえる圧力は、０．１ｋＰａ～１．０×１０６ｋＰａである、請求項８に記載のガラス板の成形装置。 9. The apparatus for forming a glass sheet according to claim 8, wherein the pressing portion presses the second main surface under a pressure of 0.1 kPa to 1.0×10 6 kPa.
JP2023009420A 2022-01-28 2023-01-25 Method for manufacturing glass plate, and apparatus for molding glass plate Pending JP2023110893A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2022012123 2022-01-28
JP2022012123 2022-01-28

Publications (1)

Publication Number Publication Date
JP2023110893A true JP2023110893A (en) 2023-08-09

Family

ID=87392809

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2023009420A Pending JP2023110893A (en) 2022-01-28 2023-01-25 Method for manufacturing glass plate, and apparatus for molding glass plate

Country Status (3)

Country Link
JP (1) JP2023110893A (en)
CN (1) CN116514375A (en)
TW (1) TW202334043A (en)

Also Published As

Publication number Publication date
CN116514375A (en) 2023-08-01
TW202334043A (en) 2023-09-01

Similar Documents

Publication Publication Date Title
CN109843823B (en) Glass for chemical strengthening, chemically strengthened glass, and method for producing chemically strengthened glass
US10759147B2 (en) Laminated glass article and method for forming the same
JP7392233B2 (en) bent base material
JP7258555B2 (en) High-strength ultra-thin glass and manufacturing method thereof
US9376337B2 (en) Method for producing glass sheet with bent portion and glass sheet with bent portion
US10377656B2 (en) Shaped glass articles and methods for forming the same
CN105377781B (en) The method and apparatus of preparation molding glassware
US10273179B2 (en) Glass manufacturing system and method for forming a high quality thin glass sheet
CN105050975A (en) Tempered glass and glass for tempering
CN103214172A (en) Method of manufacturing chemically strengthened glass plate
WO2015033866A1 (en) Light guide plate
CN101370742B (en) Alkali-free glass substrate
CN113511812B (en) Ultrathin flexible electronic glass and preparation method thereof
JP2023110893A (en) Method for manufacturing glass plate, and apparatus for molding glass plate
CN112512981A (en) Tempered glass and glass for tempering
WO2023181719A1 (en) Method for producing glass sheet
WO2011136149A1 (en) Production method for glass plate and glass plate
JP2018002585A (en) Production method of molded glass and heating apparatus
JP2017091940A (en) Glass lenticular structure
TW202304609A (en) Glass plate manufacturing method and transfer mold
CN112969667A (en) Glass article having three-dimensional shape and method for producing same, chemically strengthened glass article and method for producing same
CN108975686B (en) Method for producing non-roller patterned glass
WO2024117002A1 (en) Glass sheet, production method for glass sheet, and production device for glass sheet
JP7196855B2 (en) Method for manufacturing bent base material and mold for bent base material
JP2023035944A (en) Method for manufacturing glass plate and apparatus for molding glass plate