JP2008093744A - Rotary grinding wheel - Google Patents

Rotary grinding wheel Download PDF

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JP2008093744A
JP2008093744A JP2006274862A JP2006274862A JP2008093744A JP 2008093744 A JP2008093744 A JP 2008093744A JP 2006274862 A JP2006274862 A JP 2006274862A JP 2006274862 A JP2006274862 A JP 2006274862A JP 2008093744 A JP2008093744 A JP 2008093744A
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Prior art keywords
plate glass
resin
rotating grindstone
absorbing layer
glass
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JP5305214B2 (en
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Naoki Nishimura
直樹 西村
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Nippon Electric Glass Co Ltd
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Nippon Electric Glass Co Ltd
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Priority to JP2006274862A priority Critical patent/JP5305214B2/en
Priority to PCT/JP2007/067406 priority patent/WO2008044408A1/en
Priority to KR1020087030046A priority patent/KR101429044B1/en
Priority to CN2007800289857A priority patent/CN101500755B/en
Priority to TW096134017A priority patent/TWI429507B/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D5/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting only by their periphery; Bushings or mountings therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B9/00—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor
    • B24B9/02—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground
    • B24B9/06—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain
    • B24B9/08—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass
    • B24B9/10—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass of plate glass
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D3/00—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D3/00—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents
    • B24D3/02—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent
    • B24D3/20—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent and being essentially organic
    • B24D3/28—Resins or natural or synthetic macromolecular compounds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D5/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting only by their periphery; Bushings or mountings therefor
    • B24D5/16—Bushings; Mountings

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotary grinding wheel and an end surface machining method of a plate glass which can prevent deficit or damage without deteriorating productivity even if the end part of the plate glass is chamfered. <P>SOLUTION: The rotary grinding wheel 10 is made of aluminum, and composed of a disc-like base metal 10a (an outside diameter of 120 mm, an inside diameter of 80 mm and a thickness of 40 mm) having a hole part 10a' at the center, a circular ring-like, for example, shock absorption layer 10b (a thickness of 10 mm) made of phenol resin bonded to the outer peripheral surface of the disc-like base metal 10a, and a circular ring-like abrasive grain layer 10c (a thickness of 5 mm) bonded to the outer peripheral surface of the shock absorption layer 10b. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、ガラス、セラミック等の脆性材料からなる板状物を研削するのに適した回転砥石に関し、特に液晶ディスプレイ用板ガラス（厚み０．１〜０．７ｍｍ）やプラズマディスプレイ用板ガラス（厚み１．０〜３．０ｍｍ）等のディスプレイ用板ガラスを面取り加工するのに好適な回転砥石に関するものである。   The present invention relates to a rotating grindstone suitable for grinding a plate-like material made of a brittle material such as glass or ceramic, and in particular, a plate glass for liquid crystal display (thickness 0.1 to 0.7 mm) or a plate glass for plasma display (thickness 1). The present invention relates to a rotating grindstone suitable for chamfering a plate glass for display such as 0.0 to 3.0 mm).

近年、液晶ディスプレイは、テレビ、パソコン、携帯電話等の多方面の用途に使用されている。またプラズマディスプレイは、大画面テレビに多く使用されている。   In recent years, liquid crystal displays are used in various applications such as televisions, personal computers, and mobile phones. Plasma displays are often used for large screen televisions.

液晶ディスプレイやプラズマディスプレイ等のディスプレイに用いられる板ガラスは、その主要面に内部欠陥（気泡、異物混入等）や外部欠陥（凹凸、傷、異物付着、汚染等）が存在すると、像の歪みやボケ、濁り、輝点等が発生し、表示を不鮮明にするといった致命傷となるため、製造工程から仕上げ工程まで、高い精度と精密性を維持すべく厳密な管理の下で製造されている。   If glass plates used in displays such as liquid crystal displays and plasma displays have internal defects (such as bubbles or foreign matter) or external defects (such as irregularities, scratches, foreign matter adhesion, or contamination) on their main surfaces, image distortion and blurring will occur. It is produced under strict management from the manufacturing process to the finishing process so as to maintain high accuracy and precision, because turbidity, bright spots, etc. are generated and the display becomes unclear.

またディスプレイ用板ガラスは、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面取り加工が施される。   In addition, display glass plates are shipped after being molded by a glass manufacturer and then cut to a predetermined size. However, since the cut surface is rough, defects and breakage are likely to occur in subsequent processes. Chamfering is applied to prevent it.

従来、ディスプレイ用板ガラスの面取り加工は、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粗研削用回転砥石を、板ガラスの端面に押し当てることによって粗研削を行い、続いて、同様な形状の環状溝を有する仕上げ研削用の回転砥石を、板ガラスの端面に押し当てることによって仕上げ研削を行うのが一般的であった。   Conventionally, chamfering processing of a display plate glass is performed by roughly grinding a rotating grindstone 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, In general, finish grinding is performed by pressing a rotating grindstone for finishing grinding having an annular groove of a shape against an end face of a plate glass.

通常、粗研削用回転砥石としては、中心に孔部を有する円盤状（ドーナツ状）の台金の外周面に、メタルボンドで保持されたダイヤモンド砥粒層を取り付けてなるホイール（メタルボンドダイヤモンドホイール）が使用され、また仕上げ研削用回転砥石としては、台金の外周面に、炭化珪素等の細かい砥粒をポリウレタン樹脂等で結合したホイール（レジンボンドホイール）が使用されている。   Usually, as a rotating grindstone for rough grinding, a wheel (metal bond diamond wheel) in which a diamond abrasive layer held by a metal bond is attached to the outer peripheral surface of a disc-shaped (doughnut-shaped) base metal having a hole in the center. In addition, as a rotary grindstone for finish grinding, a wheel (resin bond wheel) in which fine abrasive grains such as silicon carbide are bonded to the outer peripheral surface of a base metal with polyurethane resin or the like is used.

上記方法は、各回転砥石に形成された環状溝を、移動する板ガラスの端面に圧接することによって面取り加工を行うものであるが、仕上げ研削用回転砥石で板ガラスを研削する際、板ガラスが欠損したり、破損することがあった。この理由は、仕上げ研削用回転砥石は、外周面が砥粒を樹脂で結合することによって作製されており、粗研削用回転砥石に比べて強度が低く、研削力に劣るため、ガラス板に対する負荷が大きくなり、ガラス板に衝撃が加わりやすいからであると考えられる。   In the above method, chamfering is performed by pressing the annular groove formed in each rotating grindstone against the end face of the moving plate glass. However, when the plate glass is ground with the rotating grindstone for finish grinding, the plate glass is lost. Or was damaged. The reason for this is that the grinding wheel for finish grinding is produced by bonding the abrasive grains with resin on the outer peripheral surface, and is lower in strength than the grinding wheel for rough grinding and inferior in grinding force. This is thought to be due to the fact that the size of the glass plate is large and impact is easily applied to the glass plate.

また板ガラスの移動速度を大きくしたり、仕上げ研削用回転砥石の回転速度を大きくするほど、板ガラスに加わる衝撃力が大きくなり、板ガラスの欠損や破損がより一層発生しやすくなるため、生産性の向上を図ることは困難であった。   In addition, as the movement speed of the plate glass is increased or the rotation speed of the rotary grindstone for finish grinding is increased, the impact force applied to the plate glass increases, and the breakage and breakage of the plate glass are more likely to occur, thus improving productivity. It was difficult to plan.

このような事情から、従来より、板ガラスの端部を面取り加工する際に発生するカケや破損を防止する方法が各種提案されている。（例えば特許文献１）
特開平９−２３５１４５号公報 Under such circumstances, various methods have been proposed in the past for preventing chipping and breakage that occur when chamfering the edge of a sheet glass. (For example, Patent Document 1)
Japanese Patent Laid-Open No. 9-235145

特許文献１には、板ガラスの端部に、予め液状樹脂の層を被覆、硬化させてから、砥石により面取り加工する方法が開示されている。この方法によると、予め板ガラス端部の表面に凝固性樹脂をコーティングしておき、この樹脂と共に板ガラスの端部を面取り加工することにより、欠損等の欠点が出ないようにすることが可能である。   Patent Document 1 discloses a method of chamfering with a grindstone after a liquid resin layer is coated and cured in advance on an end portion of a plate glass. According to this method, it is possible to prevent defects such as defects by coating a solidifying resin on the surface of the end portion of the plate glass in advance and chamfering the end portion of the plate glass together with this resin. .

しかしながら、この方法では、板ガラスの面取り加工すべき端部の表面全体に亘って、液状樹脂をコーティングする工程が必要であり、さらに面取り加工した後に板ガラスの表面に残存した樹脂を除去する工程も必要となるため、生産効率が大幅に低下するという問題があった。   However, this method requires a step of coating the liquid resin over the entire surface of the end portion of the plate glass to be chamfered, and further a step of removing the resin remaining on the surface of the plate glass after chamfering. Therefore, there has been a problem that the production efficiency is greatly reduced.

本発明の目的は、生産効率を低下させることなく、板ガラスの端部を面取り加工しても、欠損や破損を防止できる回転砥石、及び板ガラスの端面加工方法を提供することである。   An object of the present invention is to provide a rotating grindstone and a method for processing an end surface of a plate glass that can prevent chipping or breakage even if the end portion of the plate glass is chamfered without lowering the production efficiency.

本発明者等は、上記目的を達成すべく種々の実験を繰り返した結果、板ガラスの端部を回転砥石で面取り加工する際に、板ガラスに加わる衝撃力を低下させることのできる回転砥石を使用することによって、板ガラスの欠損や破損を抑えることができることを見いだし、本発明を提案するに至った。   As a result of repeating various experiments to achieve the above object, the present inventors use a rotating grindstone that can reduce the impact force applied to the sheet glass when chamfering the edge of the sheet glass with the rotating grindstone. Thus, it has been found that chipping and breakage of the plate glass can be suppressed, and the present invention has been proposed.

すなわち本発明の回転砥石は、円盤状台金の外周面に、弾性材料からなる衝撃吸収層が設けられ、該衝撃吸収層の表面に砥粒層が設けられた構造を有することを特徴とする。   That is, the rotating grindstone of the present invention is characterized in that a shock-absorbing layer made of an elastic material is provided on the outer peripheral surface of a disk-shaped base metal, and an abrasive grain layer is provided on the surface of the shock-absorbing layer. .

また本発明の回転砥石は、衝撃吸収層が、熱硬化性樹脂から形成されてなることを特徴とする。   The rotating grindstone of the present invention is characterized in that the impact absorbing layer is formed of a thermosetting resin.

また本発明の回転砥石は、熱硬化性樹脂が、フェノール樹脂、シリコ−ン樹脂、ユリア樹脂、メラミン樹脂、ポリエステル樹脂、ポリウレタン樹脂、エポキシ樹脂、ポリイミド樹脂、ポリカーボネート樹脂の群から選ばれた１種であることを特徴とする。   In the rotary grindstone of the present invention, the thermosetting resin is one selected from the group consisting of phenol resin, silicone resin, urea resin, melamine resin, polyester resin, polyurethane resin, epoxy resin, polyimide resin, and polycarbonate resin. It is characterized by being.

また本発明の回転砥石は、砥粒層が、多数の砥粒と、熱硬化性樹脂を主成分とする結合剤とからなることを特徴とする。   The rotating grindstone of the present invention is characterized in that the abrasive grain layer is composed of a large number of abrasive grains and a binder mainly composed of a thermosetting resin.

また本発明の板ガラスの端面加工方法は、板ガラスの端面を回転砥石に沿って相対移動させることによって加工する板ガラスの端面加工方法であって、前記回転砥石が、円盤状台金の外周面に、弾性材料からなる衝撃吸収層が設けられ、該衝撃吸収層の表面に砥粒層が接合した構造を有することを特徴とする。   Moreover, the end surface processing method of the plate glass of the present invention is an end surface processing method of the plate glass that is processed by relatively moving the end surface of the plate glass along the rotating grindstone, and the rotating grindstone is disposed on the outer peripheral surface of the disk-shaped base metal. A shock absorbing layer made of an elastic material is provided, and an abrasive layer is bonded to the surface of the shock absorbing layer.

また本発明の板ガラスの端面加工方法は、板ガラスが、厚み３．０ｍｍ以下であることを特徴とする。   In addition, the plate glass end face processing method of the present invention is characterized in that the plate glass has a thickness of 3.0 mm or less.

また本発明の板ガラスの端面加工方法は、板ガラスが、厚み０．７ｍｍ以下であることを特徴とする。   Moreover, the plate glass end face processing method of the present invention is characterized in that the plate glass has a thickness of 0.7 mm or less.

本発明の回転砥石は、円盤状台金と砥粒層との間に、弾性材料からなる衝撃吸収層が介在しているため、回転砥石に被加工物が接触した時、被加工物に加わる衝撃を、衝撃吸収層の弾性変形を利用することによって緩和することになる。そのため、この回転砥石を使用して板ガラスの端部を面取り加工した場合、回転砥石から板ガラスに加わる衝撃力を緩和して微細加工することが可能となるため、欠損や破損を防止することができ、ムラがなく、均一に研磨された円弧状（Ｒ状）の面取り加工面が得られる。また一般に回転砥石のガラス板に対する負荷が大きくなると、ガラス板の端面に焼け不良、つまり研削による摩擦熱によってガラス表面が軟化変形する現象が発生するが、本発明の回転砥石は、ガラス板に対する負荷が小さいため、焼け不良を防止することもできる。   In the rotating grindstone of the present invention, an impact absorbing layer made of an elastic material is interposed between the disc-shaped base metal and the abrasive grain layer, so that when the workpiece comes into contact with the rotating grindstone, it is added to the workpiece. The impact is mitigated by utilizing the elastic deformation of the shock absorbing layer. Therefore, when chamfering the edge of a sheet glass using this rotating grindstone, it is possible to reduce the impact force applied to the sheet glass from the rotating grindstone and finely process it, thus preventing damage and breakage. In addition, an arc-shaped (R-shaped) chamfered surface that is evenly polished without any unevenness can be obtained. In general, when the load on the glass plate of the rotating grindstone is increased, the end surface of the glass plate is poorly burned, that is, a phenomenon occurs in which the glass surface is softened and deformed by frictional heat due to grinding. Therefore, it is possible to prevent burn-in defects.

また本発明の回転砥石は、高速回転させても、板ガラスに加わる衝撃力が小さいため、欠損や破損を発生させることなく、面取り加工の時間を短縮でき、生産性の大幅な向上を図ることも可能となる。   In addition, the rotating grindstone of the present invention has a small impact force applied to the plate glass even when it is rotated at a high speed, so that the time for chamfering can be shortened without causing breakage or breakage, and the productivity can be greatly improved. It becomes possible.

また本発明の回転砥石は、ガラス板の端面を均一に微細加工することができるため、環状溝に詰まるガラス粉等の異物を極小に抑えることができ、これらの異物に起因する発塵が少なく、清浄な表面を有するガラス板を製造することが可能である。   In addition, since the rotating grindstone of the present invention can uniformly and finely process the end face of the glass plate, foreign matter such as glass powder clogged in the annular groove can be minimized, and dust generation due to these foreign matters is small. It is possible to produce a glass plate with a clean surface.

また本発明の板ガラスの端面加工方法によると、欠損や破損のない清浄な板ガラスを効率良く生産することが可能である。そのため寸法精度や表面品位に対する要求レベルの高いディスプレイ用板ガラスの面取り加工に適しており、特に厚みが０．７ｍｍ以下で、僅かな衝撃でも割れやすい液晶ディスプレイ用板ガラスの面取り加工に好適である。   Further, according to the method for processing an end face of a plate glass of the present invention, it is possible to efficiently produce a clean plate glass free from defects or breakage. Therefore, it is suitable for chamfering processing of a glass plate for a display having a high level of demand for dimensional accuracy and surface quality, and particularly suitable for chamfering processing of a glass plate for a liquid crystal display having a thickness of 0.7 mm or less and easily broken even by a slight impact.

本発明の回転砥石は、円盤状台金の外周面に、弾性材料からなる衝撃吸収層が設けられ、該衝撃吸収層の表面に砥粒層が設けられた構造を有することを特徴とするものであり、その中心部を構成する円盤状台金の材質は、アルミニウム、鋼、超硬合金、モリブデン、モリブデン合金、サーメット、チタンまたはセラミック等が使用できる。尚、鋼材料としては、例えば炭素工具鋼、合金工具鋼、高速度鋼等が使用可能である。   The rotating grindstone of the present invention has a structure in which a shock absorbing layer made of an elastic material is provided on the outer peripheral surface of a disk-shaped base metal, and an abrasive layer is provided on the surface of the shock absorbing layer. As the material of the disk-shaped base metal constituting the central portion, aluminum, steel, cemented carbide, molybdenum, molybdenum alloy, cermet, titanium, ceramic, or the like can be used. In addition, as a steel material, carbon tool steel, alloy tool steel, high-speed steel, etc. can be used, for example.

また最外層部を構成する砥粒層は、結合材と多数の砥粒との混合物を焼成することによって作製される。結合材としては、熱硬化性樹脂を主成分とするレジンボンド等が使用でき、また砥粒としては、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。砥粒層を構成する結合材と砥粒との割合は、結合材が３０〜９７体積％、砥粒が３〜７０体積％が適当であり、砥粒層の外表面から砥粒の一部が露出するように作製する。また砥粒の粒径は、その研削量や仕上げ表面粗さの要求レベルに応じて選択すれば良く、例えば、＃１００〜３０００、好ましくは＃６００〜１０００の範囲で適宜決定すれば良い。   The abrasive layer constituting the outermost layer portion is produced by firing a mixture of a binder and a large number of abrasive grains. As the binder, a resin bond mainly composed of a thermosetting resin can be used, and as the abrasive grains, 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 ratio of the binder and the abrasive grains constituting the abrasive layer is suitably 30 to 97% by volume for the binder and 3 to 70% by volume for the abrasive, and a part of the abrasive grains from the outer surface of the abrasive layer. It is made so that is exposed. The grain size of the abrasive grains may be selected according to the grinding amount and the required level of finished surface roughness. For example, it may be appropriately determined in the range of # 100 to 3000, preferably # 600 to 1000.

また円盤状台金と砥粒層との間に介在する衝撃吸収層の材質としては、被加工物が回転砥石に接触した際、被加工物に加わる衝撃力を低下させるような高い弾性を備え、且つ、高温下に長時間曝しても変形しない材料が適している。具体的には、フェノール樹脂、ＡＢＳ樹脂、シリコ−ン樹脂、ユリア樹脂、メラミン樹脂、ポリエステル樹脂、ポリウレタン樹脂、エポキシ樹脂、ポリイミド樹脂、ポリカーボネート樹脂等の熱硬化性樹脂が適している。特にフェノール樹脂は、変形し難く、安価であるため最適である。また衝撃吸収層の厚みが小さいと、十分な衝撃吸収性能が得られず、一方、厚みが大きいと、回転砥石が変形しやすくなるため、５〜３０ｍｍ、好ましくは１０〜２０ｍｍの範囲に規制すべきである。   In addition, the material of the shock absorbing layer interposed between the disk-shaped base metal and the abrasive grain layer has a high elasticity that reduces the impact force applied to the workpiece when the workpiece contacts the rotating grindstone. A material that does not deform even when exposed to high temperatures for a long time is suitable. Specifically, thermosetting resins such as phenol resin, ABS resin, silicone resin, urea resin, melamine resin, polyester resin, polyurethane resin, epoxy resin, polyimide resin, and polycarbonate resin are suitable. In particular, a phenol resin is optimal because it is difficult to deform and is inexpensive. Further, if the thickness of the impact absorbing layer is small, sufficient impact absorbing performance cannot be obtained. On the other hand, if the thickness is large, the rotating grindstone is likely to be deformed, so that the range of 5 to 30 mm, preferably 10 to 20 mm is regulated. Should.

また本発明の回転砥石の回転周速度は、回転砥石及び被加工物の材質や形状、被加工物の移動速度、研削量等によって適宜調整するが、例えば、液晶ディスプレイ用板ガラスの仕上げ研削加工を行う場合には、１０００〜３０００ｍ／分、好ましくは１８００〜２０００ｍ／分の回転周速度に調整すれば良い。   The rotational peripheral speed of the rotating grindstone of the present invention is appropriately adjusted according to the material and shape of the rotating grindstone and the workpiece, the moving speed of the workpiece, the grinding amount, etc. In the case of carrying out, the rotational peripheral speed may be adjusted to 1000 to 3000 m / min, preferably 1800 to 2000 m / min.

本発明の回転砥石を作製するには、まず円盤状の台金を準備する。次に、円盤状台金の外周面に、弾性材料からなる衝撃吸収層を接着剤で接合する。この衝撃吸収層の形状は、円環状で、その内周面が、円盤状台金の外周面に当接するように作製する。次に、衝撃吸収層の外周面に、砥粒層を接着剤で接合する。この砥粒層の形状も円環状で、その内周面が、衝撃吸収層の外周面に当接するように作製する。その後、砥粒層にツルーリング、ドレッシングを施し、その外周面に単数本または複数本の環状溝を形成することによって、回転砥石が完成する。   In order to produce the rotary grindstone of the present invention, a disk-shaped base metal is first prepared. Next, an impact absorbing layer made of an elastic material is bonded to the outer peripheral surface of the disk-shaped base metal with an adhesive. The shock absorbing layer is formed in an annular shape so that its inner peripheral surface is in contact with the outer peripheral surface of the disk-shaped base metal. Next, the abrasive grain layer is bonded to the outer peripheral surface of the shock absorbing layer with an adhesive. The shape of the abrasive grain layer is also annular, and the inner peripheral surface thereof is fabricated so as to contact the outer peripheral surface of the shock absorbing layer. Thereafter, truling and dressing are applied to the abrasive grain layer, and one or a plurality of annular grooves are formed on the outer peripheral surface thereof, thereby completing the rotating grindstone.

本発明の板ガラスの端面加工方法は、板ガラスの端面を回転砥石に沿って相対移動させることによって加工する板ガラスの端面加工方法であって、前記回転砥石が、円盤状台金の外周面に、弾性材料からなる衝撃吸収層が設けられ、該衝撃吸収層の表面に砥粒層が接合した構造を有することを特徴とするものであり、使用する板ガラスとしては、厚み３．０ｍｍ以下、さらには０．７ｍｍ以下であることが好ましい。   An end face processing method for a plate glass according to the present invention is an end face processing method for a plate glass that is processed by relatively moving the end face of the plate glass along the rotating grindstone, and the rotating grindstone is elastic on the outer peripheral surface of the disk-shaped base metal. A shock-absorbing layer made of a material is provided, and the surface of the shock-absorbing layer has a structure in which an abrasive layer is bonded. The plate glass to be used has a thickness of 3.0 mm or less, and further 0 0.7 mm or less is preferable.

以下、本発明を実施例に基づいて詳細に説明する。   Hereinafter, the present invention will be described in detail based on examples.

図１は、本発明の回転砥石１０を示す斜視図である。この回転砥石１０は、アルミニウム製で、中心に孔部１０ａ′を有する円盤状台金１０ａ（外径１２０ｍｍ、内径８０ｍｍ、厚み４０ｍｍ）と、この円盤状台金１０ａの外周面に接合された円環状の例えばフェノール樹脂製の衝撃吸収層１０ｂ（厚み１０ｍｍ）と、この衝撃吸収層１０ｂの外周面に接合された円環状の砥粒層１０ｃ（厚み５ｍｍ）から構成されている。   FIG. 1 is a perspective view showing a rotating grindstone 10 of the present invention. This rotating grindstone 10 is made of aluminum and has a disc-shaped base metal 10a (outer diameter 120mm, inner diameter 80mm, thickness 40mm) having a hole 10a 'in the center, and a circle joined to the outer peripheral surface of the disc-shaped base metal 10a. It is composed of an annular impact absorbing layer 10b (thickness 10 mm) made of, for example, a phenol resin, and an annular abrasive grain layer 10c (thickness 5 mm) joined to the outer peripheral surface of the impact absorbing layer 10b.

上記円盤状台金１０ａと衝撃吸収層１０ｂとは、耐熱性接着剤によって接合され、衝撃吸収層１０ｂと砥粒層１０ｃも、耐熱性接着剤によって接合されている。また砥粒層１０ｃは、多数のダイヤモンド砥粒（例えば粒径が＃６００〜１０００）と、メタルボンド（結合材）との混合物を円環状に焼成することによって作製している。また、この砥粒層１０ｃには、ツルーリング、ドレッシングが施され、その外表面には、複数本（例えば１０〜３０本）の環状溝１０ｄ（溝幅１．０ｍｍ）が形成されている。   The disk-shaped base metal 10a and the shock absorbing layer 10b are bonded by a heat resistant adhesive, and the shock absorbing layer 10b and the abrasive layer 10c are also bonded by a heat resistant adhesive. The abrasive layer 10c is produced by firing a mixture of a large number of diamond abrasive grains (for example, a particle size of # 600 to 1000) and a metal bond (binding material) in an annular shape. In addition, the abrasive layer 10c is subjected to truuring and dressing, and a plurality of (for example, 10 to 30) annular grooves 10d (groove width of 1.0 mm) are formed on the outer surface thereof.

図２は、上記回転砥石１０と駆動源との連結構造を示す説明図である。回転砥石１０は、その中心に形成された孔部を介して、回転軸１１に同軸に連結され、この回転軸１１が、ベルト車１２に取り付けたベルト１３を介してモーター１４に連結されており、モーター１４が作動し、回転軸１１が回転駆動することによって回転砥石１０が周回転するようになっている。   FIG. 2 is an explanatory view showing a connection structure between the rotary grindstone 10 and a drive source. The rotating grindstone 10 is coaxially connected to a rotating shaft 11 through a hole formed in the center thereof, and the rotating shaft 11 is connected to a motor 14 via a belt 13 attached to a belt wheel 12. When the motor 14 is operated and the rotating shaft 11 is driven to rotate, the rotating grindstone 10 rotates around.

次に、上記回転砥石１０を使用して板ガラスの面取り加工を行う方法について説明する。   Next, a method for chamfering a sheet glass using the rotating grindstone 10 will be described.

図３は、本発明の板ガラスＧの面取り加工方法の実施形態概念を示す要部概略斜視図である。図３に示すように、板ガラスＧは、ベルトコンベヤ等の搬送機構（図示省略）によって、端面に沿う方向（図中の矢印方向）に一定の速度で移動し、搬送路の途中両側に設置した回転砥石１５、１６に圧接係合される。搬送方向の上流側に位置する粗研削用回転砥石１５としては、一般に使用されるメタルボンドダイヤモンドホイールを使用し、また下流側に位置する仕上げ研削用の回転砥石１６としては、上記した本発明の回転砥石１０を使用する。   FIG. 3 is a main part schematic perspective view showing an embodiment concept of the chamfering method of the glass sheet G of the present invention. As shown in FIG. 3, the plate glass G is moved at a constant speed in the direction along the end face (in the direction of the arrow in the figure) by a transport mechanism (not shown) such as a belt conveyor, and is installed on both sides of the transport path. The rotary grindstones 15 and 16 are pressed into engagement. As the rough grinding rotary grindstone 15 located on the upstream side in the conveying direction, a commonly used metal bond diamond wheel is used, and as the finish grinding rotary grindstone 16 located on the downstream side, the above-described present invention is used. A rotating grindstone 10 is used.

これらの回転砥石１５、１６の回転方向は、板ガラスＧの移動速度に逆らう方向としている。また各回転砥石１５、１６の回転軸線の傾動は、０〜４５°の範囲内で行うことが可能であり、通常では、０〜３０°程度の範囲で使用するのが適当である。   The rotation direction of these rotary grindstones 15 and 16 is set to a direction against the moving speed of the glass sheet G. Further, the tilting of the rotation axis of each of the rotating grindstones 15 and 16 can be performed within a range of 0 to 45 °, and it is usually appropriate to use within a range of about 0 to 30 °.

本発明は、特に薄肉の液晶ディスプレイ用板ガラスの面取り加工に適用するのが好ましい。例えば、１１００×１２５０×０．７ｍｍの寸法を有する液晶ディスプレイ用板ガラスの端面の仕上げ研削を行うに当たり、板ガラスＧを４ｍ／分の速度で搬送しながら、まず粗研削回転砥石１５に送り込むことによって、板ガラスＧの両端面を粗研削し、次いで板ガラスＧを仕上げ研削用回転砥石１６に送り込むことによって、板ガラスＧの両端面を仕上げ研削した。尚、粗研削用回転砥石１５は、直径１５０ｍｍ、高さ（軸線方向幅）１０〜４０ｍｍ、砥石粒度♯３００〜６００であり、回転周速度を１５００〜３５００ｍ／分の条件に設定し、また仕上げ研削用回転砥石１６は、直径１５０ｍｍ、高さ（軸線方向幅）３０〜１００ｍｍ、砥石粒度♯６００〜１０００であり、回転周速度を１８００〜２０００ｍ／分の条件に設定した。また研削箇所には、水を吹き付けて砥石面の目詰まりを防止するようにした。その結果、欠損や破損がなく、しかもムラがなく均一に研磨された円弧状の面取り加工面を有する板ガラスＧが得られた。また上記と同様の液晶ディスプレイ用板ガラス１００００枚を連続で面取り加工したが、欠損や破損が発生することはなかった。   The present invention is particularly preferably applied to chamfering of thin glass plate glass for liquid crystal displays. For example, in performing finish grinding of an end face of a liquid crystal display plate glass having a size of 1100 × 1250 × 0.7 mm, the plate glass G is first fed into the coarse grinding wheel 15 while being conveyed at a speed of 4 m / min. Both end surfaces of the plate glass G were subjected to rough grinding, and then the plate glass G was fed to the rotary grindstone 16 for finish grinding to finish-grind both end surfaces of the plate glass G. The rough grinding rotary grindstone 15 has a diameter of 150 mm, a height (axial width) of 10 to 40 mm, a grindstone particle size of # 300 to 600, a rotational peripheral speed set to 1500 to 3500 m / min, and finishing. The grinding grindstone 16 has a diameter of 150 mm, a height (width in the axial direction) of 30 to 100 mm, a grindstone particle size of # 600 to 1000, and a rotational peripheral speed set to 1800 to 2000 m / min. In addition, water was sprayed on the grinding location to prevent clogging of the grindstone surface. As a result, there was obtained a plate glass G having an arc-shaped chamfered surface that was uniformly polished without any defects or breakage and without unevenness. Further, 10000 sheets of liquid crystal display plate glass similar to the above were continuously chamfered, but no chipping or breakage occurred.

このように本発明の回転砥石は、衝撃吸収層を備えるため、板ガラスを研削する際、板ガラスに対する衝撃力を緩和するので、板ガラスの欠損や破損を防止することができ、しかもガラス粉等による汚染を抑えることができる。よって本発明の回転砥石は、寸法精度や表面品位に対する要求レベルが極めて高いディスプレイ用板ガラスに適しており、特に液晶ディスプレイ用ガラス基板のように薄肉で破損しやすい板ガラスの仕上げ研削用回転砥石として好適である。   As described above, since the rotating grindstone of the present invention includes the shock absorbing layer, when the plate glass is ground, the impact force on the plate glass is reduced, so that the glass plate can be prevented from being broken or damaged, and the glass powder is contaminated. Can be suppressed. Therefore, the rotary whetstone of the present invention is suitable for a plate glass for display that has a very high level of requirement for dimensional accuracy and surface quality, and is particularly suitable as a rotary grindstone for finish grinding of thin glass plates that are easily damaged such as glass substrates for liquid crystal displays. It is.

本発明の回転砥石を示す斜視図である。It is a perspective view which shows the rotary grindstone of this invention. 本発明の回転砥石と駆動源との連結構造を示す説明図である。It is explanatory drawing which shows the connection structure of the rotary grindstone of this invention, and a drive source. 本発明の板ガラスの面取り加工方法を示す要部概略斜視図である。It is a principal part schematic perspective view which shows the chamfering processing method of the plate glass of this invention.

符号の説明Explanation of symbols

１０ 回転砥石
１０ａ 円盤状台金
１０ａ′ 円盤状台金の孔部
１０ｂ 衝撃吸収層
１０ｃ 砥粒層
１０ｄ 環状溝
１１ 回転軸
１２ ベルト車
１３ ベルト
１４ モーター
１５ 粗研削用回転砥石
１６ 仕上げ研削用回転砥石
Ｇ 板ガラス DESCRIPTION OF SYMBOLS 10 Rotating whetstone 10a Disk-shaped base metal 10a 'Hole 10b of disk-shaped base metal Shock absorbing layer 10c Abrasive layer 10d Annular groove 11 Rotating shaft 12 Belt wheel 13 Belt 14 Motor 15 Rotating grindstone 16 for rough grinding Rotating grindstone for finish grinding G sheet glass

Claims (7)

円盤状台金の外周面に、弾性材料からなる衝撃吸収層が設けられ、該衝撃吸収層の表面に砥粒層が設けられた構造を有することを特徴とする回転砥石。   A rotating grindstone having a structure in which a shock absorbing layer made of an elastic material is provided on an outer peripheral surface of a disk-shaped base metal, and an abrasive layer is provided on the surface of the shock absorbing layer. 衝撃吸収層が、熱硬化性樹脂から形成されてなることを特徴とする請求項１記載の回転砥石。   The rotary grindstone according to claim 1, wherein the shock absorbing layer is formed of a thermosetting resin. 熱硬化性樹脂が、フェノール樹脂、シリコーン樹脂、ユリア樹脂、メラミン樹脂、ポリエステル樹脂、ポリウレタン樹脂、エポキシ樹脂、ポリイミド樹脂、ポリカーボネート樹脂のいずれか一つであることを特徴とする請求項２記載の回転砥石。   The rotation according to claim 2, wherein the thermosetting resin is any one of phenol resin, silicone resin, urea resin, melamine resin, polyester resin, polyurethane resin, epoxy resin, polyimide resin, and polycarbonate resin. Whetstone. 砥粒層が、多数の砥粒と、熱硬化性樹脂を主成分とする結合剤とからなることを特徴とする請求項１〜３のいずれかに記載の回転砥石。   The rotating grindstone according to any one of claims 1 to 3, wherein the abrasive layer comprises a large number of abrasive grains and a binder mainly composed of a thermosetting resin. 板ガラスの端面を回転砥石に沿って相対移動させることによって加工する板ガラスの端面加工方法であって、前記回転砥石が、円盤状台金の外周面に、弾性材料からなる衝撃吸収層が設けられ、該衝撃吸収層の表面に砥粒層が設けられた構造を有することを特徴とする板ガラスの端面加工方法。   An end face processing method for a plate glass that is processed by relatively moving the end face of the plate glass along the rotating grindstone, wherein the rotating grindstone is provided with an impact absorbing layer made of an elastic material on the outer peripheral surface of the disk-shaped base metal, A method for processing an end face of a sheet glass, characterized by having a structure in which an abrasive layer is provided on the surface of the shock absorbing layer. 板ガラスの厚みが３．０ｍｍ以下であることを特徴とする請求項５記載の板ガラスの端面加工方法。   The method for processing an end face of a plate glass according to claim 5, wherein the thickness of the plate glass is 3.0 mm or less. 板ガラスの厚みが０．７ｍｍ以下であることを特徴とする請求項５記載の板ガラスの端面加工方法。   The method for processing an end face of a plate glass according to claim 5, wherein the thickness of the plate glass is 0.7 mm or less.
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KR1020087030046A KR101429044B1 (en) 2006-10-06 2007-09-06 Grindstone
CN2007800289857A CN101500755B (en) 2006-10-06 2007-09-06 Grindstone
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JP2012139785A (en) * 2010-12-29 2012-07-26 Avanstrate Inc Method for manufacturing glass substrate
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