JP3693560B2 - Fire glass finishing method - Google Patents

Fire glass finishing method Download PDF

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JP3693560B2
JP3693560B2 JP2000223763A JP2000223763A JP3693560B2 JP 3693560 B2 JP3693560 B2 JP 3693560B2 JP 2000223763 A JP2000223763 A JP 2000223763A JP 2000223763 A JP2000223763 A JP 2000223763A JP 3693560 B2 JP3693560 B2 JP 3693560B2
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glass
polishing
finishing
plate glass
edge
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JP2001080930A (en
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啓介 田中
公成 杉浦
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Nippon Sheet Glass Co Ltd
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Nippon Sheet Glass Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B27/00—Tempering or quenching glass products
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00—Technologies relating to the processing of minerals
    • Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
    • Y02P40/57—Improving the yield, e-g- reduction of reject rates

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  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Special Wing (AREA)
  • Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は、例えば、防火戸に用いることができる防火ガラスの仕上げ方法に関する。
【０００２】
【従来の技術】
板ガラスを防火戸に用いる場合、板ガラスの熱割れ現象（熱を受けて板ガラスの中央部に発生した熱膨張によって、窓枠等に支持された板ガラスエッジ部分に引張応力が作用し、その引張応力が、板ガラスに備わったエッジ強度を超えることによって割れを生じる）を防止するために、ガラスのエッジ強度が高いことが必要である。
防火用の板ガラスとしては、網入りガラスや、含水珪酸アルカリからなる中間層を挟み込んだ積層ガラスが知られているが、前者は、内装の網が視界を遮り透視性を損なう危険性があり、後者は、前記中間層が熱変化で発泡して不透明になり透視性を損なう危険性がある。これらの問題点が無いものとして、ソーダ石灰系のガラスを熱強化処理したものが上げられる。
熱強化処理は、ガラスの軟化点（７２０〜７３０℃）をかなり超える温度域 （約７６０℃）で板ガラスを加熱し、連続する空気冷却部分において、背圧９５０ｍｍＡｑと非常に高い圧力で冷却空気を吹付けて実施される方法がある。但し、この様な板ガラスの熱強化処理に伴っては、所定のエッジ強度を付与することはできるものの、上述のとおりガラス軟化点を超える高温域で加熱した板ガラスに強圧の空気を吹き付けるために、ガラス表面の平坦性に欠けたり、反りを生じて、反射映像上の不具合を生じる危険性がある。
【０００３】
従来、この種の防火ガラスの仕上げ方法としては、フラットな端縁部を形成するために、図５に示すように、カップホイール（ホイール側面２０ａに研磨用ダイヤモンドや砥石を付設してあるもの）２０をその軸芯周りに回転させて、前記ホイール側面２０ａを板ガラス２１の端縁部２１ａ、及び、稜部２１ｂに接当させて研磨を行っていた。
【０００４】
【発明が解決しようとする課題】
上述した従来の防火ガラスの仕上げ方法によれば、端縁部の研磨によって生じた稜部に目視では観察しにくいような細かい研磨溝が発生し、熱膨張に伴う熱応力が前記研磨溝に集中的に作用し易く、特に、前記ソーダ石灰系のガラス（熱強化処理を実施しないもの）においては、エッジ強度が高く望めないという問題点がある。
【０００５】
従って、防火用板ガラスとして使用するためには、前述の熱強化処理を実施する必要性があり、その結果、前述の熱強化処理による不具合を生じるという問題点が発生する。また、前記熱強化処理による不具合（表面不平坦・反り発生）を解消するために、加熱温度や吹付け空気の背圧を従来の熱強化処理の値より低下させた熱強化処理（以下、単に低熱強化処理という）を実施すると、例えば、防火戸として不適なエッジ強度しか得られなくなる。
【０００６】
従って、本発明の目的は、上記問題点を解消し、板ガラスのエッジ強度を増大させることができる防火ガラスの仕上げ方法を提供するところにある。
【０００７】
【課題を解決するための手段】
請求項１の発明の特徴手段は、板ガラスの端面を外方に突出した曲面形状に研磨する第一研磨工程を経て、少なくとも、前記第一研磨工程によって前記板ガラスの端面に形成された曲面部と前記板ガラス表裏の平面部との境部を、稜部が無くなるように前記第一研磨工程より滑らかに加工する仕上げ工程を実施した後、最低１７ｋｇｆ／ｍｍ2 の板ガラスエッジ強度となるように熱強化処理を実施して防火ガラスにするところにある。
【０００８】
一般的に、板ガラス内に生じる発生応力は、稜部に集中し易い性質があるが、請求項１の発明の特徴手段によれば、板ガラスの端面を外方に突出した曲面形状に研磨する第一研磨工程を経て、少なくとも、前記第一研磨工程によって前記板ガラスの端面に形成された曲面部と前記板ガラス表裏の平面部との境部を、稜部が無くなるように前記第一研磨工程より滑らかに加工する仕上げ工程を実施するから、板ガラス端縁部に応力が集中し難くくすることができる。つまり、特に、前記曲面部と前記板ガラス表裏の平面部との境部を前記第一研磨工程より滑らかに加工する仕上げ工程を実施することによって、稜部を無くすと共に、より滑らかな仕上げ表面を形成することができ、研磨によって大きな研磨溝がついてそこに応力が集中するのを防止し易くなり、結果的には、板ガラスのエッジ強度を従来より増加させることが可能となる。
そして、エッジ強度が増加すれば、熱強化処理を実施するのに、従来より低い温度域での加熱や、従来より低い圧力での空気の吹付けによる熱強化処理を実施しても、所定の熱強化処理後エッジ強度を確保することができるようになり、従来のような、ガラス表面の平坦性に欠けたり、反りを生じて、反射映像上の不具合が発生するのを防止できる。更には、熱強化処理設備の稼動コストの低減をも図ることが可能となる。
【０００９】
請求項２の発明の特徴構成は、前記仕上げ工程は、バフ磨きによって実施されるところにある。
【００１０】
請求項２の発明の特徴構成によれば、研磨表面の凹凸を数μｍオーダーに磨き上げることができ、研磨によって前記境部に大きな研磨溝が発生するのを防止でき、研磨溝への板ガラスの応力集中を抑えて、より板ガラスのエッジ強度を増加させることが可能となる。
【００１１】
請求項３の発明の特徴構成は、前記仕上げ工程は、加熱溶融によって実施されるところにある。
【００１２】
請求項３の発明の特徴構成によれば、前記仕上げ工程による仕上げ面を板ガラス表面と同様に仕上げることができ、板ガラスに作用する発生応力を、端縁部で全体で受けることができ、より板ガラスのエッジ強度を増加させることが可能となる。
【００１３】
請求項４の発明の特徴構成は、前記仕上げ工程は、化学的な溶解によって実施されるところにある。
【００１４】
請求項４の発明の特徴構成によれば、仕上げ工程そのものを簡単な作業手順によって実施することが可能となり、板ガラスの端縁部仕上げ作業の効率を向上させることができる。
【００１５】
【発明の実施の形態】
以下に本発明の実施の形態を図面に基づいて説明する。
【００１６】
図２は、サッシュ１に対して、本発明の防火ガラスの仕上げ方法の一実施形態によってその端縁部２を仕上げた板ガラス３をはめて形成してある防火戸４を示すものである。
【００１７】
前記サッシュ１は、戸枠部分を形成する環状のサッシュ本体５を設け、前記板ガラス３をサッシュ本体５に保持するための保持部６を、前記サッシュ本体５の枠内周部分に着脱自在に設けて構成してある。
前記サッシュ本体５、及び、保持部６は、共に金属で形成してあり、火災が発生しても前記板ガラス３を保持できることを考慮して形成してある。前記保持部６は、一対のアングル部材で構成してあり、夫々の間に前記板ガラス３の端縁部２を保持できる隙間７を形成できる状態に前記サッシュ本体５に取り付けてある。
【００１８】
また、前記隙間７には、前記板ガラス３の端縁保護の機能を備えたクロロプレンゴム製のセッティングブロック（前記サッシュ１の下辺の隙間７にのみ設置）８と、前記板ガラス３の端縁部２を挟持して保持部６に固定する保持金物９とを設けてある。
前記保持金物９は、金属製の薄板部材によって形成してあり、前記隙間７に板ガラス３を位置させることによって、前記端縁部２を弾性的に挟み込み固定できるように形成してある。具体的には、板ガラス３の端縁部２のほぼ全長にわたる長さ寸法に形成してあり、図に示すように、前記端縁部２の長手方向視における断面形状が、角張った『Ｕ』の字形状（六角形図形の上の一辺をなくした形状）で、前記『Ｕ』の字の両端部が板ガラス３の表裏面に各別に線接当するように形成してある。外径寸法は、前記隙間７の幅寸法より大きく形成してあり、前記板ガラス３の端縁部２を挟んだ状態で前記隙間７に設置することによって、前記保持部６から挟持方向の押圧力を受けて前記板ガラス３を強力に挟持固定することができ、火災時の板ガラス３の熱変形によるガラス周縁部分の外れを防止することができる。
尚、保持金物９は、金属（例えば、鉄やステンレス鋼）によって形成してあるから、環境温度に速やかに馴染み易く、例えば、火災が発生した場合に、保持している前記板ガラス３の周縁部にも熱が伝わり易くして周縁部と中央部との温度差が生じにくい状態を作り出し、破壊し難くすことが可能となる。この板ガラス３の破壊し難さを、エッジに発生する応力に換算すると、約５〜６ｋｇｆ／ｍｍ2 ほど応力が緩和することが確認されている。
【００１９】
次に、板ガラス３について説明する。
前記板ガラス３は、吊り金具を使用しない製法で形成されたソーダ石灰系の板ガラスを、後述の端縁部仕上げ工程を経てから、熱強化処理を施して形成してある。
【００２０】
前記板ガラス３は、その端面を外方に突出した曲面形状に研磨する第一研磨工程を経て、少なくとも、前記第一研磨工程によって前記板ガラス３の端面に形成された曲面部３ａと前記板ガラス３表裏の平面部３ｂとの境部３ｃを、前記第一研磨工程より滑らかに加工する仕上げ工程を実施して端縁仕上げを行ってある。
【００２１】
具体的には、前記第一研磨工程は、図１（イ）に示すように、軸芯廻りに回転する円筒ホイール１０の外周面を使って研磨する平廻り円筒ホイール型研磨方式の研磨方法によって実施するもので、前記円筒ホイール１０は、軸芯方向での中間部ほど外径寸法が小径になるようにその外周面を形成してあり、被研磨部分となる板ガラス端面が、外方に突出した曲面形状に研磨されるように構成してある。そして、前記円筒ホイール１０の外周面は、＃２００番手より細かな研磨部に形成してある。
この第一研磨工程において研磨された前記曲面部３ａは、表面内の凹凸が０．０３ｍｍ程度に仕上げられており、非常に細かな凹凸であるから、板ガラス３の発生応力が集中的に作用するのを避け易くなる。
更には、第一研磨工程での研磨方向は、板ガラス端面の長手方向に沿って設定してあるから、研磨に伴う筋（キズ）は、同様に板ガラス端面の長手方向に沿って形成され、板ガラス３の板面に沿って作用する熱破壊力等の集中を回避し易くなる。
【００２２】
前記仕上げ工程は、図１（ロ）に示すように、二軸の回転軸に張り廻されて回転する研磨用ベルト１１の外周面を使って研磨するバフ磨き方式の研磨方法によって実施するものである。このバフ磨きとは、極上仕上げとも呼ばれ、一般的には、羊の皮で形成したベルト１１で研磨し、その研磨に際しては、酸化セリウム（非常に細かい粒度の研磨粉）の水溶液を被研磨部分に掛けながら実施することによって、表面粗さが数μｍ（殆ど板ガラス表裏面の表面粗さと等しい値）にまで細かくなり、ツヤをだすことも可能で、前記境部３ｃへの発生応力の集中が起こり難くすることができる。
【００２３】
前記第一研磨工程、及び、仕上げ工程によって、板ガラス３の端縁部２に発生応力が集中し難くすることができ、特に、板ガラス３の板面に沿って作用する発生応力の集中を回避し易くなる。その結果、火災による熱を受けても破壊し難くすことが可能となり、エッジ強度として約４ｋｇｆ／ｍｍ2 ほど向上することが確認されている。
【００２４】
例えば、建設省告示第１１２５号に基づく防火試験での甲種及び乙種防火戸として板ガラスを使用するには、板ガラスのエッジ強度を２６ｋｇｆ／ｍｍ2 以上に確保する必要があるが、本実施例の板ガラス３によれば、前記保持金物９による保持に伴う約５〜６ｋｇｆ／ｍｍ2 の発生応力の緩和、及び、端面部の仕上げに伴う約４ｋｇｆ／ｍｍ2 のエッジ強度の向上を叶えることが可能になるから、熱強化処理によって最低１７ｋｇｆ／ｍｍ2 の強化を図るだけでよくなる。
従って、当該板ガラス３の熱強化処理においては、板ガラス３の加熱温度は、ガラスの軟化点（７２０〜７３０℃）以下、冷却空気吹付けの際のノズルからの背圧は、５００ｍｍＡｑで実施しても、所定のエッジ強度を確保することができるようになり、従来のように、加熱温度７６０℃、空気吹付け背圧９５０ｍｍＡｑで実施する熱強化処理によって生じる危険性のあった品質の低下（ガラス表面の平坦性に欠けたり、反りを生じる）を防止して、歩留まりをよくすることができると共に、熱強化処理設備の稼動コストの低減をも図ることが可能となる。
【００２５】
尚、熱強化処理された板ガラス３のエッジ強度（代用特性としての表面圧縮応力）の測定は、全反射応力測定方法により行った。全反射応力測定方法は、被測定板ガラス表面にこれより屈折率の僅かに大きいプリズムを置き、被測定点に集束する円偏光光束を全反射臨界角にほぼ等しい角度で入射させて、反射光観察望遠鏡の視野に現れる明暗の全反射境界線間のずれ量を既知応力により較正した目盛りで測定する方法によって実施した。
【００２６】
〔別実施形態〕
以下に別実施形態を説明する。
【００２７】
〈１〉 前記第一研磨工程は、先の実施例で説明した平廻り円筒ホイール型研磨方式による研磨方法に限定されるものではなく、例えば、カップホイール（ホイール面に研磨用ダイヤモンドや砥石を付設してあるもの）を用いた研磨方法との併用や、バフ磨き方式の研磨方法、又は、その併用による研磨方法であってもよい。また、前記仕上げ工程は、先の実施例で説明したバフ磨きに限定されるものではなく、例えば、板ガラス３端縁部の局部的な加熱溶融によって実施したり、又は、化学的な溶解によって実施するものであってもよい。要するに、前記第一研磨工程によって研磨された前記曲面部３ａと前記板ガラス３表裏の平面部３ｂとの境部３ｃを、少なくとも、前記第一研磨工程より滑らかに加工できるように仕上げるものであればよい。
〈２〉 本実施例による板ガラス３と、サッシュ本体５との取り付けは、先の実施例に限定されるものではなく、例えば、図３に示すように、使用する保持金物として、サッシュ本体５と面接触する金属製の弾性保持金物９ａを使用して固定すれば、サッシュ本体５への輻射熱を、前記保持金物９ａから板ガラス３の周縁部に効率よく伝達することができ、板ガラスの中央部と周縁部との温度差を少なくして、破壊し難くすることが可能となる。また、取り付け状態の他の実施例としては、図４に示すように、サッシュ本体５の押縁５ａに嵌合する金属製の弾性保持金物９ｂと、不燃製板（例えば、ケイカル板）によって挟持固定するものであってもよい。
【図面の簡単な説明】
【図１】実施例の板ガラス端縁部の仕上げ方法を示す説明図
【図２】実施例の防火戸を示す要部の断面図
【図３】別実施例の板ガラス取り付け状況を示す断面図
【図４】別実施例の板ガラス取り付け状況を示す断面図
【図５】従来例の板ガラス端縁部の仕上げ方法を示す説明図
【符号の説明】
３ 板ガラス
３ａ 曲面部
３ｂ 平面部
３ｃ 境部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to, for example, finishing method of fire protection glass that can be used in the fire door.
[0002]
[Prior art]
When using plate glass for fire doors, thermal cracking phenomenon of plate glass (the thermal expansion generated in the center of the plate glass due to the heat causes a tensile stress to act on the edge of the plate glass supported by the window frame, etc. In order to prevent the occurrence of cracks by exceeding the edge strength provided in the glass sheet, it is necessary that the glass has a high edge strength.
As glass for fire protection, laminated glass with a meshed glass or an intermediate layer made of hydrous alkali silicate sandwiched is known, but the former has a risk of impairing the visibility due to the mesh of the interior, In the latter case, there is a risk that the intermediate layer foams due to heat change and becomes opaque and impairs transparency. As what does not have these problems, what heat-strengthened soda-lime-type glass can be raised.
In the heat strengthening treatment, the glass sheet is heated in a temperature range (about 760 ° C.) that is much higher than the softening point (720 to 730 ° C.) of the glass. There is a method that is carried out by spraying. However, along with such a heat strengthening treatment of the plate glass, although a predetermined edge strength can be imparted, in order to blow strong pressure air on the plate glass heated in a high temperature range exceeding the glass softening point as described above, There is a risk that the flatness of the glass surface may be lacked or warped, resulting in defects on the reflected image.
[0003]
Conventionally, as the finishing method of this kind of fire glass, to form a flat edge, that is annexed a polishing diamond or grinding wheel, as shown in FIG. 5, the cup wheel (wheel side 20a ) 20 was rotated around its axis, and the wheel side surface 20a was brought into contact with the edge portion 21a and the ridge portion 21b of the plate glass 21 for polishing.
[0004]
[Problems to be solved by the invention]
According to the finishing method of the conventional fire glass, which has been described above, the fine abrasive grooves as hardly observed occur in visually ridge caused by the polishing of the edge portion, thermal stress caused by thermal expansion in said polishing groove In particular, the soda-lime glass (not subjected to the heat strengthening treatment) has a problem that the edge strength is high and cannot be expected.
[0005]
Therefore, in order to use it as a fireproof plate glass, it is necessary to carry out the above-described heat strengthening treatment, and as a result, there arises a problem that a problem due to the above-described heat strengthening treatment occurs. In addition, in order to eliminate the problems caused by the heat strengthening process (surface unevenness / warp occurrence), the heat strengthening process (hereinafter, simply referred to as the heating temperature or the back pressure of the blowing air is lower than the value of the conventional heat strengthening process). When the low heat strengthening process is performed, for example, only an edge strength unsuitable as a fire door can be obtained.
[0006]
Accordingly, an object of the present invention is to solve the above problems, is to provide a finishing method for fire protection glass that can increase the edge strength of the glass sheet.
[0007]
[Means for Solving the Problems]
The characteristic means of the invention of claim 1 includes a curved surface portion formed on the end surface of the plate glass by at least the first polishing step through a first polishing step of polishing the end surface of the plate glass into a curved shape protruding outward. After performing a finishing process in which the boundary between the flat part on the front and back of the glass sheet is processed more smoothly than the first polishing process so that there is no ridge , heat strengthening is performed so that the glass sheet edge strength is at least 17 kgf / mm 2. There is a place to make fire glass by processing.
[0008]
In general, the stress generated in the glass sheet tends to concentrate on the ridges. However, according to the characteristic means of the invention of claim 1, the end surface of the glass sheet is polished to a curved shape protruding outward. After at least one polishing step, at least the boundary between the curved surface portion formed on the end surface of the plate glass by the first polishing step and the flat portion of the front and back of the plate glass is smoother than the first polishing step so that the ridge portion is eliminated. Since the finishing process is performed, it is possible to make it difficult for stress to concentrate on the edge of the glass sheet. That is, in particular, by carrying out the finishing step of smoothly machined than the first polishing step the boundary portion between the curved portion and the plate glass front and back of the flat portion, the ridge portion without strike together, smoother surface finish It becomes easy to prevent stress from being concentrated on a large polishing groove formed by polishing, and as a result, the edge strength of the plate glass can be increased as compared with the conventional case.
If the edge strength increases, the heat strengthening process can be performed even if the heat strengthening process is performed by heating in a lower temperature range than before or by air blowing at a lower pressure than in the past. Edge strength can be ensured after the heat strengthening treatment, and it is possible to prevent the occurrence of defects on the reflected image due to lack of flatness or warpage of the glass surface as in the prior art. Furthermore, it is possible to reduce the operating cost of the heat strengthening treatment facility.
[0009]
The characteristic configuration of the invention of claim 2 is that the finishing step is performed by buffing.
[0010]
According to the characteristic configuration of the invention of claim 2, the unevenness of the polishing surface can be polished to the order of several μm, and it is possible to prevent the generation of large polishing grooves at the boundary due to polishing, It is possible to suppress the stress concentration and further increase the edge strength of the plate glass.
[0011]
The characterizing feature of the invention of claim 3 is that the finishing step is carried out by heating and melting.
[0012]
According to the characteristic configuration of the invention of claim 3, the finished surface by the finishing step can be finished in the same manner as the surface of the plate glass, and the generated stress acting on the plate glass can be received by the whole edge portion, and more It is possible to increase the edge strength.
[0013]
According to a fourth aspect of the present invention, the finishing step is performed by chemical dissolution.
[0014]
According to the characteristic configuration of the invention of claim 4, the finishing process itself can be performed by a simple work procedure, and the efficiency of the edge finishing work of the plate glass can be improved.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0016]
2, to the sash 1 shows a fire door 4 according to an exemplary embodiment of a method of finish fire glass is formed by glazed 3 finished the edge 2 of the present invention.
[0017]
The sash 1 is provided with an annular sash main body 5 that forms a door frame portion, and a holding portion 6 for holding the plate glass 3 on the sash main body 5 is provided detachably on the inner peripheral portion of the sash main body 5. Configured.
The sash body 5 and the holding part 6 are both made of metal, and are formed in consideration that the plate glass 3 can be held even if a fire occurs. The holding portion 6 is composed of a pair of angle members, and is attached to the sash body 5 in a state where a gap 7 that can hold the edge 2 of the plate glass 3 can be formed between them.
[0018]
Further, in the gap 7, a setting block 8 made of chloroprene rubber having a function of protecting the edge of the plate glass 3 (installed only in the gap 7 on the lower side of the sash 1), and the edge 2 of the plate glass 3. And a holding metal 9 that is fixed to the holding portion 6 by sandwiching the pin.
The holding metal 9 is formed of a metal thin plate member, and is formed so that the end edge 2 can be elastically sandwiched and fixed by positioning the plate glass 3 in the gap 7. Specifically, it is formed in a length dimension covering almost the entire length of the end edge portion 2 of the plate glass 3, and as shown in the figure, the cross-sectional shape of the end edge portion 2 in the longitudinal direction is angular “U”. And the both ends of the letter “U” are in line contact with the front and back surfaces of the glass sheet 3 separately. The outer diameter dimension is formed larger than the width dimension of the gap 7, and the pressing force in the clamping direction from the holding part 6 is set in the gap 7 with the edge 2 of the plate glass 3 being sandwiched. Accordingly, the plate glass 3 can be strongly clamped and fixed, and the glass peripheral portion can be prevented from coming off due to thermal deformation of the plate glass 3 in the event of a fire.
In addition, since the holding | maintenance hardware 9 is formed with the metal (for example, iron or stainless steel), it is easy to adjust to environmental temperature quickly, for example, when a fire breaks out, the peripheral part of the said plate glass 3 hold | maintained In addition, heat can be easily transmitted to create a state in which a temperature difference between the peripheral portion and the central portion is unlikely to occur, and it is possible to make it difficult to break. When the difficulty of breaking the glass sheet 3 is converted to the stress generated at the edge, it is confirmed that the stress is relaxed by about 5 to 6 kgf / mm 2 .
[0019]
Next, the plate glass 3 will be described.
The plate glass 3 is formed by subjecting a soda-lime-based plate glass formed by a manufacturing method that does not use a hanging metal fitting to a heat strengthening process after an end edge finishing process described later.
[0020]
The plate glass 3 is subjected to a first polishing step in which the end surface thereof is polished into a curved shape protruding outward, and at least the curved portion 3a formed on the end surface of the plate glass 3 by the first polishing step and the front and back surfaces of the plate glass 3 An edge finishing is performed by performing a finishing process in which the boundary part 3c with the flat part 3b is processed more smoothly than the first polishing process.
[0021]
Specifically, as shown in FIG. 1 (a), the first polishing step is performed by a flat-circular cylindrical wheel type polishing method in which polishing is performed using the outer peripheral surface of a cylindrical wheel 10 that rotates about an axis. The cylindrical wheel 10 is formed with an outer peripheral surface so that the outer diameter dimension is smaller in the middle portion in the axial direction, and the end face of the glass plate that becomes the portion to be polished protrudes outward. It is configured to be polished into a curved surface shape. And the outer peripheral surface of the said cylindrical wheel 10 is formed in the grinding | polishing part finer than # 200 count.
The curved surface portion 3a polished in the first polishing step has a surface unevenness of about 0.03 mm and is very fine unevenness, so that the generated stress of the plate glass 3 acts intensively. It becomes easy to avoid.
Furthermore, since the polishing direction in the first polishing step is set along the longitudinal direction of the end face of the glass sheet, flaws associated with polishing are similarly formed along the longitudinal direction of the end face of the glass sheet. It is easy to avoid concentration of thermal destruction force acting along the plate surface 3.
[0022]
As shown in FIG. 1 (b), the finishing step is performed by a buffing type polishing method in which polishing is performed using the outer peripheral surface of a polishing belt 11 that is stretched around two rotating shafts and rotates. is there. This buffing is also called superb finishing, and is generally polished with a belt 11 formed of sheepskin, and when polishing, an aqueous solution of cerium oxide (a very fine particle size polishing powder) is polished. By carrying out while applying to the part, the surface roughness becomes as fine as several μm (almost equal to the surface roughness of the front and back surfaces of the plate glass), and it is possible to give gloss, and concentration of the generated stress on the boundary part 3c. Can be difficult to happen.
[0023]
By the first polishing step and the finishing step, the generated stress can be made difficult to concentrate on the edge portion 2 of the plate glass 3, and in particular, the concentration of the generated stress acting along the plate surface of the plate glass 3 is avoided. It becomes easy. As a result, it is possible to make it difficult to break even when receiving heat from a fire, and it has been confirmed that the edge strength is improved by about 4 kgf / mm 2 .
[0024]
For example, in order to use a sheet glass as a Class A and Class B fire door in a fire prevention test based on the Ministry of Construction Notification No. 1125, it is necessary to secure the edge strength of the sheet glass to 26 kgf / mm 2 or more. according to 3, relaxation of about 5~6kgf / mm 2 of generated stress due to holding by said holding fittings 9, and to be capable of fulfilling the improvement in edge strength of about 4 kgf / mm 2 with finishing of the end surface portion Therefore, it is only necessary to strengthen at least 17 kgf / mm 2 by the heat strengthening treatment.
Therefore, in the heat strengthening treatment of the plate glass 3, the heating temperature of the plate glass 3 is set to be equal to or lower than the softening point (720 to 730 ° C.) of the glass, and the back pressure from the nozzle when cooling air is blown is 500 mmAq. In addition, a predetermined edge strength can be ensured, and, as in the prior art, there is a risk of quality degradation (glass) caused by a heat strengthening process performed at a heating temperature of 760 ° C. and an air blowing back pressure of 950 mmAq. It is possible to improve the yield by reducing the flatness of the surface or causing warping, and to reduce the operating cost of the heat strengthening treatment facility.
[0025]
Note that the edge strength (surface compression stress as a substitute characteristic) of the heat-strengthened plate glass 3 was measured by a total reflection stress measurement method. In the total reflection stress measurement method, a prism with a slightly higher refractive index is placed on the surface of the plate glass to be measured, and a circularly polarized light beam focused on the measurement point is incident at an angle approximately equal to the total reflection critical angle, and the reflected light is observed. The shift between bright and dark total reflection boundary lines appearing in the field of view of the telescope was measured by a method of measuring with a scale calibrated by known stress.
[0026]
[Another embodiment]
Another embodiment will be described below.
[0027]
<1> The first polishing step is not limited to the polishing method by the flat cylindrical wheel type polishing method described in the previous embodiment. For example, a cup wheel (a wheel surface is provided with a polishing diamond or a grindstone). And a polishing method using a buffing method, or a polishing method using the combination thereof. The finishing step is not limited to the buffing described in the previous embodiment. For example, the finishing step is performed by locally heating and melting the edge of the plate glass 3 or by chemical melting. You may do. In short, as long as the boundary portion 3c between the curved surface portion 3a polished by the first polishing step and the flat surface portion 3b of the front and back of the plate glass 3 can be processed at least more smoothly than the first polishing step. Good.
<2> The attachment of the plate glass 3 and the sash body 5 according to the present embodiment is not limited to the previous embodiment. For example, as shown in FIG. If the metal elastic holding metal 9a in surface contact is used for fixing, the radiant heat to the sash body 5 can be efficiently transmitted from the holding metal 9a to the peripheral edge of the plate glass 3, It is possible to reduce the temperature difference from the peripheral edge and make it difficult to break. As another embodiment of the attached state, as shown in FIG. 4, the metal elastic holding metal 9b fitted to the pressing edge 5a of the sash body 5 and a non-combustible plate (for example, a calcium plate) are clamped and fixed. You may do.
[Brief description of the drawings]
FIG. 1 is an explanatory view showing a finishing method of an edge portion of a glass sheet of an embodiment. FIG. 2 is a cross-sectional view of a main part showing a fire door of the embodiment. FIG. 4 is a cross-sectional view showing a state of attaching a glass sheet according to another embodiment. FIG. 5 is an explanatory view showing a finishing method of the edge of a glass sheet according to a conventional example.
3 plate glass 3a curved surface part 3b flat surface part 3c boundary part

Claims (4)

板ガラス（３）の端面を外方に突出した曲面形状に研磨する第一研磨工程を経て、少なくとも、前記第一研磨工程によって前記板ガラス（３）の端面に形成された曲面部（３ａ）と前記板ガラス（３）表裏の平面部（３ｂ）との境部（３ｃ）を、稜部が無くなるように前記第一研磨工程より滑らかに加工する仕上げ工程を実施した後、最低１７ｋｇｆ／ｍｍ2 の板ガラスエッジ強度となるように熱強化処理を実施して防火ガラスにする防火ガラスの仕上げ方法。Through the first polishing step of polishing the end surface of the plate glass (3) into a curved shape protruding outward, at least the curved surface portion (3a) formed on the end surface of the plate glass (3) by the first polishing step and the above Sheet glass (3) After performing a finishing process in which the boundary part (3c) between the front and back flat parts (3b) is processed more smoothly than the first polishing process so that the ridges are eliminated , a sheet glass of at least 17 kgf / mm 2 finishing method of fire protection glass for the fire protection glass by performing thermal tempering treatment so that the edge strength. 前記仕上げ工程は、バフ磨きによって実施される請求項１に記載の防火ガラスの仕上げ方法。The finishing step is, finishing method of fire protection glass according to claim 1 which is performed by buffing. 前記仕上げ工程は、加熱溶融によって実施される請求項１に記載の防火ガラスの仕上げ方法。The finishing step is, finishing method of fire protection glass according to claim 1 which is carried out by heating and melting. 前記仕上げ工程は、化学的な溶解によって実施される請求項１に記載の防火ガラスの仕上げ方法。The finishing step is, finishing method of fire protection glass according to claim 1 which is carried out by chemical dissolution.
JP2000223763A 2000-07-25 2000-07-25 Fire glass finishing method Expired - Lifetime JP3693560B2 (en)

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