JP6830614B2 - Flat glass manufacturing method, flat glass manufacturing equipment - Google Patents
Flat glass manufacturing method, flat glass manufacturing equipment Download PDFInfo
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Description
本発明は、端面加工工程を有する板ガラスの製造方法に関し、特に液晶ディスプレイ用板ガラスや有機ＥＬディスプレイ用板ガラス等の電子部品の基板用板ガラスを製造する方法に関する。 The present invention relates to a method for producing a flat glass having an end face processing step, and more particularly to a method for manufacturing a flat glass for a substrate of an electronic component such as a flat glass for a liquid crystal display or a flat glass for an organic EL display.
近年、特に液晶ディスプレイは、テレビ、パソコン、携帯電話、スマートフォン等の多方面の用途に使用されている。 In recent years, liquid crystal displays in particular have been used in various applications such as televisions, personal computers, mobile phones, and smartphones.
これら液晶ディスプレイ等に使用される板ガラスは、ガラスメーカーにおいて成形した後、所定の寸法に切断してから出荷されるが、その切断面は粗面であるため、後工程で欠損や破損が発生しやすく、それを防止するために端面加工が施されるのが一般的である。 The flat glass used for these liquid crystal displays and the like is molded by a glass maker, cut to a predetermined size, and then shipped. However, since the cut surface is a rough surface, defects or breakage occur in a later process. It is easy to do, and end face processing is generally applied to prevent it.
従来、下記特許文献１に記載されている通り、ディスプレイ用板ガラスの端面加工は、板ガラスの厚みよりも僅かに広い溝幅の環状溝を有する研削砥石を、板ガラスの端面に押し当てることによって端面研削（端面の形状加工）を行い、続いて、研磨砥石を、板ガラスの端面に押し当てることによって端面研磨（形状加工された端面の表面仕上げ）を行うのが一般的であった。 Conventionally, as described in Patent Document 1 below, the end face processing of a display plate glass is performed by pressing a grinding wheel having an annular groove having a groove width slightly wider than the thickness of the plate glass against the end surface of the plate glass. (Shape processing of the end face) was performed, and then, the end face was polished (the surface finish of the shape-processed end face) by pressing the polishing grindstone against the end face of the plate glass.
上記特許文献１の[０００７]に記載されている通り、従来の板ガラスの端面加工は、研削砥石の板ガラスへの押圧力が、研磨砥石の押圧力よりも大きなものとなっている。具体的には、研削砥石の板ガラスの押圧力が、研磨砥石の板ガラスの押圧力よりも、１．２倍〜４倍大きいことが記載されている。 As described in [0007] of Patent Document 1, in the conventional end face processing of the plate glass, the pressing force of the grinding wheel on the plate glass is larger than the pressing force of the polishing grindstone. Specifically, it is described that the pressing force of the plate glass of the grinding wheel is 1.2 to 4 times larger than the pressing force of the plate glass of the grinding wheel.
しかしながら、研削砥石はガラスを除去する能力が大きいことから、大きな押圧力で薄肉の板ガラスに押圧すると研削過剰となり、板ガラスの端面に生じるクラックが大きくなり、数も多くなることで板ガラスの端面品質が悪化するという問題がある。加えて、研磨砥石の押圧力が小さいと、研磨砥石はガラスを除去する能力が小さいので研削によって生じた傷を十分に除去することができず、研磨後の板ガラスの端面品質が更に悪化するという問題がある。 However, since the grinding wheel has a large ability to remove glass, if it is pressed against a thin plate glass with a large pressing force, the grinding will be excessive, the cracks generated on the end surface of the plate glass will increase, and the number of cracks will increase, resulting in the quality of the end surface of the plate glass. There is a problem of getting worse. In addition, if the pressing force of the polishing grindstone is small, the polishing grindstone has a small ability to remove the glass, so that the scratches caused by grinding cannot be sufficiently removed, and the end face quality of the flat glass after polishing is further deteriorated. There's a problem.
本発明は、上述したような従来技術の問題点を解決するためになされたものであって、端面の品質が良い板ガラスを製造する方法を提案することを目的とする。 The present invention has been made to solve the problems of the prior art as described above, and an object of the present invention is to propose a method for producing a flat glass having a good end face quality.
上記課題を解決すべく創案された発明は、板ガラスの製造方法であって、前記板ガラスの端面を第１の押圧力で研削する端面研削工程と、前記端面研削工程後の前記板ガラスの前記端面を第２の押圧力で研磨する端面研磨工程と、を有し、前記第２の押圧力は、前記第１の押圧力より大きいことを特徴とする板ガラスの製造方法に関する。 The invention devised to solve the above problems is a method for manufacturing a plate glass, in which an end face grinding step of grinding the end face of the plate glass with a first pressing force and the end face of the plate glass after the end face grinding step are subjected to. The present invention relates to a method for producing a flat glass, which comprises an end face polishing step of polishing with a second pressing force, wherein the second pressing force is larger than the first pressing force.
上記構成において、前記第２の押圧力は、前記第１の押圧力の１．２倍〜２０倍であることが好ましい。 In the above configuration, the second pressing force is preferably 1.2 to 20 times the first pressing force.
上記構成において、前記端面研削工程では、砥粒を金属結合材で固定した研削砥石を使用し、
前記端面研磨工程では、砥粒を樹脂結合材で固定した研磨砥石を使用するのが好ましい。
In the above configuration, in the end face grinding step, a grinding wheel in which abrasive grains are fixed with a metal binder is used.
In the end face polishing step, it is preferable to use a polishing grindstone in which abrasive grains are fixed with a resin binder.
上記課題を解決すべく創案された本発明は、板ガラスの製造装置であって、前記板ガラスの端面を研削する研削砥石と、前記板ガラスの前記研削後の前記端面を研磨する研磨砥石と、前記研削砥石と前記研磨砥石を制御する制御装置と、を有し前記制御装置は、前記研削砥石で前記板ガラスの前記端面を第１の押圧力で研削し、前記研磨砥石で前記板ガラスの前記端面を前記第１の押圧力より大きい第２の押圧力で研磨する、ことを特徴とする板ガラスの製造装置に関する。 The present invention, which was devised to solve the above problems, is a plate glass manufacturing apparatus, which comprises a grinding wheel for grinding the end face of the plate glass, a polishing grindstone for polishing the end face of the plate glass after grinding, and the grinding wheel. The control device has a grindstone and a control device for controlling the polishing grindstone, and the control device grinds the end face of the plate glass with the grinding wheel with a first pressing force, and the polishing grindstone grinds the end face of the plate glass with the polishing grindstone. The present invention relates to a plate glass manufacturing apparatus characterized in that polishing is performed with a second pressing force larger than the first pressing force.
本発明によれば、端面品質の良い板ガラスを製造することができる。 According to the present invention, it is possible to produce a flat glass having good end face quality.
以下、本発明に係る板ガラスの製造方法、製造装置の好適な実施形態について、図面を参照しつつ説明する。 Hereinafter, a method for manufacturing a flat glass and a preferred embodiment of a manufacturing apparatus according to the present invention will be described with reference to the drawings.
本発明に係る板ガラスの製造方法は、図１に示す通り、端面研削工程Ｓ１と、端面研磨工程Ｓ２とを有する。本発明に係る板ガラスの製造装置は、図２に示すように、研削砥石１０と研磨砥石２０と図示しない制御装置を有する。図１に示す端面研削工程Ｓ１は、図２に示す研削砥石１０で板ガラスＧの端面の研削を行い、図１に示す端面研磨工程Ｓ２は、図２に示す研磨砥石２０で研削後の板ガラスＧの端面の研磨を行う。図示しない制御装置は、研削砥石１０の板ガラスＧの端面への押圧力Ｆ１と、研磨砥石２０の板ガラスＧの端面への押圧力Ｆ２を制御する。 As shown in FIG. 1, the method for producing a flat glass according to the present invention includes an end face grinding step S1 and an end face polishing step S2. As shown in FIG. 2, the plate glass manufacturing apparatus according to the present invention includes a grinding wheel 10, a grinding wheel 20, and a control device (not shown). The end face grinding step S1 shown in FIG. 1 grinds the end face of the plate glass G with the grinding wheel 10 shown in FIG. 2, and the end face polishing step S2 shown in FIG. 1 is the plate glass G after grinding with the polishing grindstone 20 shown in FIG. Polish the end face of the. A control device (not shown) controls a pressing force F1 on the end face of the plate glass G of the grinding wheel 10 and a pressing force F2 on the end surface of the plate glass G of the grinding wheel 20.
板ガラスＧは、フロート法、オーバーフローダウンドロー法、スロットダウンドロー法等の公知の成形方法で成形され、所定の大きさに切断されている。板ガラスＧの厚さは、０．１ｍｍ〜１．４ｍｍであることが好ましく、０．２ｍｍ〜０．７ｍｍであることがより好ましく、０．２ｍｍ〜０．５ｍｍであることが最も好ましい。板ガラスＧは、液晶ディスプレイや有機ＥＬディスプレイ等のフラットパネルディスプレイや、タッチパネル、太陽電池、有機ＥＬ照明等のガラス基板用であることが好ましい。 The flat glass G is molded by a known molding method such as a float method, an overflow down draw method, or a slot down draw method, and is cut into a predetermined size. The thickness of the flat glass G is preferably 0.1 mm to 1.4 mm, more preferably 0.2 mm to 0.7 mm, and most preferably 0.2 mm to 0.5 mm. The flat glass G is preferably used for flat panel displays such as liquid crystal displays and organic EL displays, and glass substrates such as touch panels, solar cells, and organic EL lighting.
端面研削工程Ｓ１は、研削砥石１０で板ガラスＧの端面を研削する工程である。研削砥石１０は、砥粒の結合材として金属結合材（メタルボンド）が使用されていることが好ましい。結合材として使用される金属は、鉄、銅、コバルト、ニッケル、タングステン等から１種又は２種以上混合して使用されていることが好ましく、特に鉄を含むことが好ましい。研削砥石１０に結合される砥粒は、ダイヤモンド砥粒であることが好ましく、粒度は♯３００〜６００であることが好ましい。 The end face grinding step S1 is a step of grinding the end face of the plate glass G with the grinding wheel 10. The grinding wheel 10 preferably uses a metal bonding material (metal bond) as a bonding material for abrasive grains. The metal used as the binder is preferably one or a mixture of two or more of iron, copper, cobalt, nickel, tungsten and the like, and particularly preferably contains iron. The abrasive grains bonded to the grinding wheel 10 are preferably diamond abrasive grains, and the particle size is preferably # 300 to 600.
端面研磨工程Ｓ２は、端面研削工程Ｓ１後の板ガラスＧの端面を研磨砥石２０で研磨する工程である。研磨砥石２０は、砥粒の結合材として樹脂製結合材（レジンボンド）が使用されていることが好ましい。樹脂製結合材としては、熱硬化性樹脂を使用することが好ましい。樹脂製結合材として、フェノール樹脂、エポキシ樹脂、ポリイミド樹脂、ポリウレタン樹脂等を使用することができる。研磨砥石２０に結合される砥粒としては、ダイヤモンド粒子、酸化アルミニウム粒子、炭化珪素粒子、立方晶窒化硼素粒子、金属酸化物粒子、金属炭化物粒子、金属窒化物粒子等が使用できる。研磨砥石２０に結合される砥粒の粒度は、＃１００〜３０００であることが好ましく、＃２００〜１０００であることがより好ましい。 The end face polishing step S2 is a step of polishing the end face of the plate glass G after the end face grinding step S1 with a polishing grindstone 20. It is preferable that the polishing grindstone 20 uses a resin binder (resin bond) as the binder for the abrasive grains. It is preferable to use a thermosetting resin as the resin binder. As the resin binder, a phenol resin, an epoxy resin, a polyimide resin, a polyurethane resin, or the like can be used. As the abrasive grains bonded to the polishing grindstone 20, diamond particles, aluminum oxide particles, silicon carbide particles, cubic boron nitride particles, metal oxide particles, metal carbide particles, metal nitride particles and the like can be used. The particle size of the abrasive grains bonded to the polishing wheel 20 is preferably # 100 to 3000, and more preferably # 200 to 1000.
本発明は、図２に示す通り、端面研磨工程Ｓ２で研磨砥石２０が板ガラスＧを押圧する押圧力Ｆ２が、端面研削工程Ｓ１で研削砥石１０が板ガラスＧの端面を押圧する押圧力Ｆ１よりも大きくなっている。これにより、研削砥石１０による過剰研削を防止するとともに、研磨砥石２０によって板ガラスＧの端面を十分に仕上げることができ、板ガラスＧの端面の品質を良好なものとすることができる。研磨砥石２０が板ガラスＧの端面を押圧する押圧力Ｆ２は、研削砥石１０が板ガラスＧの端面を押圧する押圧力Ｆ１の１．２倍以上であることが好ましく、２倍以上であることがより好ましく、３倍以上であることが更に好ましい。また、研磨砥石２０が板ガラスＧの端面を押圧する押圧力Ｆ２は、研削砥石１０が板ガラスＧの端面を押圧する押圧力Ｆ１の２０倍以下であることが好ましく、１５倍以下であることがより好ましく、１２倍以下であることが最も好ましい。これにより、研削砥石１０による板ガラスＧの端面の過剰研削や研削不足をより確実に防止することができると共に、研磨砥石２０による過剰研磨や研磨不足をより確実に防止することができる。 In the present invention, as shown in FIG. 2, the pressing force F2 at which the polishing grindstone 20 presses the plate glass G in the end face polishing step S2 is higher than the pressing force F1 at which the grinding wheel 10 presses the end face of the plate glass G in the end face grinding step S1. It's getting bigger. As a result, excessive grinding by the grinding wheel 10 can be prevented, and the end face of the plate glass G can be sufficiently finished by the polishing wheel 20, and the quality of the end face of the plate glass G can be improved. The pressing force F2 at which the polishing grindstone 20 presses the end face of the plate glass G is preferably 1.2 times or more, more preferably at least 1.2 times the pressing force F1 at which the grinding wheel 10 presses the end face of the plate glass G. It is preferable, and more preferably 3 times or more. Further, the pressing force F2 at which the polishing grindstone 20 presses the end face of the plate glass G is preferably 20 times or less, more preferably 15 times or less, the pressing force F1 at which the grinding wheel 10 presses the end face of the plate glass G. It is preferably 12 times or less, and most preferably 12 times or less. As a result, it is possible to more reliably prevent excessive grinding and insufficient grinding of the end face of the plate glass G by the grinding wheel 10, and it is possible to more reliably prevent excessive polishing and insufficient polishing by the polishing wheel 20.
研削砥石１０が板ガラスＧの端面を押圧する押圧力Ｆ１は、０．５Ｎ〜５Ｎであることが好ましく、１Ｎ〜４Ｎであることがより好ましく、２Ｎ〜３Ｎであることがさらに好ましい。研磨砥石２０が板ガラスＧの端面を押圧する押圧力Ｆ２は、１Ｎ〜１５Ｎであることが好ましく、５Ｎ〜１５Ｎであることがより好ましく、７Ｎ〜１３Ｎであることが更に好ましく、８Ｎ〜１１Ｎであることが最も好ましい。これにより、より良好な端面品位を有する板ガラスＧを製造することができる。 The pressing force F1 on which the grinding wheel 10 presses the end surface of the plate glass G is preferably 0.5N to 5N, more preferably 1N to 4N, and even more preferably 2N to 3N. The pressing force F2 on which the polishing wheel 20 presses the end face of the plate glass G is preferably 1N to 15N, more preferably 5N to 15N, further preferably 7N to 13N, and 8N to 11N. Is most preferable. Thereby, the flat glass G having a better end face quality can be manufactured.
次に、製造装置１を使用して板ガラスを製造する方法について説明する。 Next, a method of manufacturing a flat glass using the manufacturing apparatus 1 will be described.
図２に示す通り、厚さ０．５ｍｍの板ガラスＧを所定の速度で搬送しながら、まず端面研削工程Ｓ１を行う。端面研削工程Ｓ１では、板ガラスＧを研削砥石１０に送り込み、研削砥石１０が相対的に押圧力の小さい押圧力Ｆ１で板ガラスＧの両端面を研削加工する。次いで端面研磨工程Ｓ２を行う。端面研磨工程Ｓ２では、板ガラスＧを研磨砥石２０に送り込み、研磨砥石２０が相対的に押圧力の大きい押圧力Ｆ２で板ガラスＧの両端面に仕上げ研磨を施す。これにより、研削砥石１０の過剰研削と研磨砥石２０の研磨不足を防止することができ、良好な端面品位を有する板ガラスＧを製造することができる。 As shown in FIG. 2, the end face grinding step S1 is first performed while transporting the plate glass G having a thickness of 0.5 mm at a predetermined speed. In the end face grinding step S1, the plate glass G is sent to the grinding wheel 10, and the grinding wheel 10 grinds both end surfaces of the plate glass G with a pressing force F1 having a relatively small pressing force. Next, the end face polishing step S2 is performed. In the end face polishing step S2, the plate glass G is sent to the polishing grindstone 20, and the polishing grindstone 20 performs finish polishing on both end surfaces of the plate glass G with a pressing force F2 having a relatively large pressing force. As a result, it is possible to prevent excessive grinding of the grinding wheel 10 and insufficient polishing of the grinding wheel 20, and it is possible to manufacture a plate glass G having good end face quality.
図２を使用して本発明の実施形態を説明したが、本発明は図２の実施形態には限定されない。図２では研削砥石１０は、１個しか記載されていないが、２個以上使用しても良い。同様に、研磨砥石２０も２個以上使用しても良い。また、図２では、板ガラスＧの長辺のみを端面加工している形態で説明を行ったが、図示しない回転機構を備えることで、板ガラスＧの短辺も同様に端面加工を行っても良い。また、図２では、研削砥石１０と研磨砥石２０が固定され、板ガラスＧが移動する形態で説明を行ったが、逆に、板ガラスＧを定盤等に固定し、研削砥石１０と研磨砥石２０が移動する形態でも良い。 Although the embodiment of the present invention has been described with reference to FIG. 2, the present invention is not limited to the embodiment of FIG. Although only one grinding wheel 10 is shown in FIG. 2, two or more grinding wheels 10 may be used. Similarly, two or more polishing grindstones 20 may be used. Further, in FIG. 2, the description has been made in the form in which only the long side of the flat glass G is processed on the end face, but by providing a rotation mechanism (not shown), the short side of the flat glass G may be similarly processed on the end face. .. Further, in FIG. 2, the description has been made in the form in which the grinding wheel 10 and the polishing wheel 20 are fixed and the plate glass G moves. On the contrary, the plate glass G is fixed to a surface plate or the like, and the grinding wheel 10 and the polishing wheel 20 are fixed. May be in the form of moving.
本発明は、主として電子デバイス用途のガラス基板の製造に好適に使用することができる。 The present invention can be suitably used for manufacturing a glass substrate mainly for electronic devices.
１ 製造装置
１０ 研削砥石
２０ 研磨砥石
Ｓ１ 端面研削工程
Ｓ２ 端面研磨工程
Ｆ１ 研削砥石の押圧力（第１の押圧力）
Ｆ２ 研磨砥石の押圧力（第２の押圧力）
Ｇ 板ガラス
1 Manufacturing equipment 10 Grinding wheel 20 Grinding wheel S1 End face grinding process S2 End face polishing process F1 Pressing pressure of grinding wheel (first pressing force)
Pressing pressure of F2 polishing grindstone (second pressing force)
G plate glass
Claims (4)
前記板ガラスの端面を第１の押圧力で研削する端面研削工程と、
前記端面研削工程後の前記板ガラスの前記端面を第２の押圧力で研磨する端面研磨工程と、を有し、
前記第２の押圧力は、前記第１の押圧力より大きいことを特徴とする板ガラスの製造方法。 It is a manufacturing method of flat glass.
An end face grinding step of grinding the end face of the plate glass with a first pressing force, and
It has an end face polishing step of polishing the end face of the plate glass with a second pressing force after the end face grinding step.
A method for producing a flat glass, wherein the second pressing force is larger than the first pressing force.
前記端面研磨工程では、砥粒を樹脂結合材で固定した研磨砥石を使用する、
ことを特徴とする請求項１又は２に記載の板ガラスの製造方法。 In the end face grinding step, a grinding wheel in which abrasive grains are fixed with a metal binder is used.
In the end face polishing step, a polishing grindstone in which abrasive grains are fixed with a resin binder is used.
The method for producing a flat glass according to claim 1 or 2.
前記板ガラスの端面を研削する研削砥石と、
前記板ガラスの前記研削後の前記端面を研磨する研磨砥石と、
前記研削砥石と前記研磨砥石を制御する制御装置と、を有し
前記制御装置は、前記研削砥石で前記板ガラスの前記端面を第１の押圧力で研削し、前記研磨砥石で前記板ガラスの前記端面を前記第１の押圧力より大きい第２の押圧力で研磨する、
ことを特徴とする板ガラスの製造装置。 It is a flat glass manufacturing equipment
A grinding wheel that grinds the end face of the flat glass,
A polishing grindstone for polishing the end face of the plate glass after grinding, and
It has a grinding wheel and a control device for controlling the polishing wheel, and the control device grinds the end face of the plate glass with the grinding wheel with a first pressing force, and the polishing wheel grinds the end face of the plate glass with the polishing wheel. Is polished with a second pressing force larger than the first pressing force.
A flat glass manufacturing device characterized by this.
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