JPS61232241A - Production of deep bent sheet tempered glass - Google Patents

Production of deep bent sheet tempered glass

Info

Publication number
JPS61232241A
JPS61232241A JP7349785A JP7349785A JPS61232241A JP S61232241 A JPS61232241 A JP S61232241A JP 7349785 A JP7349785 A JP 7349785A JP 7349785 A JP7349785 A JP 7349785A JP S61232241 A JPS61232241 A JP S61232241A
Authority
JP
Japan
Prior art keywords
glass plate
temperature
heating furnace
flat glass
glass
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
JP7349785A
Other languages
Japanese (ja)
Inventor
Masayuki Miwa
三輪 雅之
Hiroshi Tsuji
博史 辻
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
Priority to JP7349785A priority Critical patent/JPS61232241A/en
Publication of JPS61232241A publication Critical patent/JPS61232241A/en
Pending legal-status Critical Current

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C03GLASS; MINERAL OR SLAG WOOL
    • C03BMANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B23/00Re-forming shaped glass
    • C03B23/02Re-forming glass sheets
    • C03B23/023Re-forming glass sheets by bending
    • C03B23/03Re-forming glass sheets by bending by press-bending between shaping moulds
    • C03B23/031Re-forming glass sheets by bending by press-bending between shaping moulds the glass sheets being in a vertical position
    • CCHEMISTRY; METALLURGY
    • C03GLASS; MINERAL OR SLAG WOOL
    • C03BMANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B29/00Reheating glass products for softening or fusing their surfaces; Fire-polishing; Fusing of margins
    • C03B29/04Reheating glass products for softening or fusing their surfaces; Fire-polishing; Fusing of margins in a continuous way
    • C03B29/14Reheating glass products for softening or fusing their surfaces; Fire-polishing; Fusing of margins in a continuous way with vertical displacement of the products
    • C03B29/16Glass sheets

Landscapes

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

Abstract

PURPOSE:To reduce the time of regular forming, transfer the flat glass kept at a temperature higher than that necessary to a quenching process and make it possible to carry out sufficient tempering treatment by preforming the flat glass before transferring to the regular forming carried out at ordinary temperature in a heating furnace. CONSTITUTION:A pane of flat glass is heated in a heating furnace and preformed. The regular forming for deep bending of the flat glass after passing through the heat preforming step and taking out of the heating furnace is car ried out in a short time. The resultant pane of flat glass kept at a temperature higher than that necessary after passing through the regular forming is quenched and tempered.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は深曲げ薄板強化ガラスの製造方法に関し、特に
ガラス板の両翼部を深曲げ加工した後、急冷強化する深
曲げ薄板強化ガラスの製造方法に関する。
[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for producing deep-bent thin sheet tempered glass, and particularly to a method for producing deep-bent thin sheet tempered glass in which both wings of a glass plate are deeply bent and then rapidly cooled and strengthened. Regarding the method.

〔従来の技術〕[Conventional technology]

自動車のフロントガラスなどに使用される強化湾曲ガラ
スは、通常、所定のガラス板を加熱軟化させた後に型を
用いて湾曲成形し、これを急冷強化することで製造され
ている。このような製造方法の1つとして、板ガラスを
吊り手で垂直に吊持し、加熱炉で加熱軟化させ、常温下
で両側から雄型と雌型とからなる型でプレスした後に風
冷強化するという方法が一般に知られている。
Tempered curved glass used for automobile windshields and the like is usually manufactured by heating and softening a predetermined glass plate, then bending it using a mold, and rapidly cooling and strengthening it. One such manufacturing method is to hang a plate glass vertically with a hanger, heat it in a heating furnace to soften it, press it from both sides at room temperature with a mold consisting of a male mold and a female mold, and then strengthen it by cooling with air. This method is generally known.

ところで、ガラス板を十分に強化するためには、急冷開
始時のガラス板を600℃以上、特に板厚が2.5〜4
■の場合には645〜650℃の温度に保持させておく
ことが必要であるとされ【いる。したがって、加熱後の
炉出しから急冷開始時までの所要時間は、ガラス板の温
度低下を極力少なくするという意味からできるだけ短か
くするのが望ましい。
By the way, in order to sufficiently strengthen the glass plate, the temperature of the glass plate at the start of quenching must be 600°C or higher, especially when the plate thickness is 2.5 to 4.
In the case of (2), it is said that it is necessary to maintain the temperature at 645 to 650°C. Therefore, it is desirable that the time required from the time the glass plate is taken out of the oven after heating until the start of quenching be as short as possible in order to minimize the temperature drop of the glass plate.

またその一方で、曲げ加工時に際してのガラス板は、軟
化しすぎていても硬すぎていても成形加工上好ましくな
いことから、加熱炉内でのガラス板への加熱も自ら限ら
れた温度の範囲内で制御され【いることが必要になる。
On the other hand, if the glass plate is too softened or too hard during bending, it is not desirable for the forming process. It is necessary to be controlled within a range.

つまり、急冷開始時に強化のために必要とされるガラス
板の温度は、ガラス板を加熱軟化させるために好適であ
るとされる狭小な範囲の許容温度の制約下で、その上限
温度から、炉出し後に低下し、かつ許容される下限温度
の範囲という比較的狭い温度範囲内に設定されていなけ
ればならないのである。
In other words, the temperature of the glass plate required for strengthening at the start of quenching is determined from the upper limit temperature within the narrow range of allowable temperature that is considered suitable for heating and softening the glass plate. The temperature must be set within a relatively narrow temperature range, which is the lower limit temperature that is lowered after discharge and is permissible.

この場合、肉厚が4−以上の比較的厚いガラス板につい
ては、その厚みにより保熱力がもたらされるので、急冷
開始時までの所要時間にもある程度の余裕が残されるこ
とになり、したがって、ガラス板の温度をある温度以上
に保持させておき、必要にして十分な強化加工を施すこ
とも割合に容易であった。
In this case, for a relatively thick glass plate with a wall thickness of 4 mm or more, the thickness provides heat retention ability, so a certain amount of time is left until the start of rapid cooling. It was also relatively easy to maintain the temperature of the plate above a certain temperature and perform necessary and sufficient strengthening processing.

〔発明が解決しようとする問題点〕[Problem that the invention seeks to solve]

しかし、肉厚が4.0− L 5−程度のガラス板を加
工成形して強化する場合にも、上記従来方法のように炉
外の常温下で成形加工を行ない、その後に強化のために
急冷するという方法をとっていたのでは、温度低下が大
きくて急冷開始時まで所定の温度を保持することができ
ず、したがって、ガラス板には十分な強度を付与するた
めの強化加工を施すことができないという問題が指摘さ
れていた。これは、ガラス板の肉厚が薄いために厚いも
のに比較して熱容量が少ないものとなる結果、保熱力が
劣ってしまうためである。その結果、ガラス板の温度低
下速度は速くなり、急冷開始時に必要とされる下限所要
温度を保持することは困難となってこれを下回り、十分
に強化することができなくなってしまうのである。
However, even when processing and forming a glass plate with a wall thickness of about 4.0 L 5 - to strengthen it, the forming process is performed outside the furnace at room temperature, as in the conventional method described above, and then the strengthening process is performed. If the method of rapid cooling was used, the temperature drop would be large and the specified temperature could not be maintained until the start of rapid cooling.Therefore, it was necessary to strengthen the glass plate to give it sufficient strength. The problem of not being able to do so was pointed out. This is because the glass plate is thin, so its heat capacity is smaller than that of a thick glass plate, resulting in poor heat retention. As a result, the temperature decrease rate of the glass plate becomes faster, and it becomes difficult to maintain the required lower limit temperature required at the start of rapid cooling, and the temperature drops below this, making it impossible to sufficiently strengthen the glass plate.

本発明の目的は、従来技術のこのような問題点を解消す
ることにあり、肉厚が4.0〜L5m程度のガラス板で
あっても十分な強化を図ることができる深曲げ薄板強化
ガラスの製゛造方法を提供しようとするものである。
The purpose of the present invention is to solve these problems of the prior art, and to provide a deep-bent thin sheet tempered glass that can be sufficiently strengthened even for glass sheets with a wall thickness of about 4.0 to 5 m. The aim is to provide a method for manufacturing.

〔問題点を解決するための手段〕[Means for solving problems]

このような目的を達成するため、本発明に係る深曲げ薄
板強化ガラスの製造方法は、ガラス板を加熱炉内の熱間
で加熱して深曲げのための予備成形を行なう加熱予備成
形工程と、加熱予備成形工程を経た炉出し後のガラス板
に対し深曲げのための本成形を行なうプレス工程と、プ
レス工程を経たガラス板を急冷強化するための冷却工程
を経ることにその特徴がある。
In order to achieve such an object, the method for manufacturing deep-bent thin sheet tempered glass according to the present invention includes a heating preforming step in which a glass plate is heated in a heating furnace to preform for deep bending. , its characteristics include a pressing process in which the glass plate after being heated and preformed is subjected to main forming for deep bending, and a cooling process to rapidly cool and strengthen the glass plate after the pressing process. .

〔作 用〕[For production]

このため、加熱炉内の熱間でガラス板は予め深曲げのた
めの予備成形されており、炉外の常温下で行なわれる本
成形としてのプレス工程も予備成形されていないものに
比較して時間短縮を達成することができ、したがって、
ガラス板の急冷開始時の温度を強化に必要な下限所要温
度以上に保持させたまま冷却工程へと移行することがで
き、十分な強化処理加工を施すことができる。
For this reason, the glass plate is preformed for deep bending in the heat inside the heating furnace, and the pressing process as the main forming performed outside the furnace at room temperature is also compared to a glass sheet that is not preformed. Time savings can be achieved and therefore
It is possible to proceed to the cooling process while maintaining the temperature at the start of rapid cooling of the glass plate above the lower limit required temperature necessary for strengthening, and sufficient strengthening processing can be performed.

〔実施例〕〔Example〕

以下、図面に例示するところに従って本発明を説明する
Hereinafter, the present invention will be explained according to examples illustrated in the drawings.

図面は本発明に係る方法を実施する際に使用される装置
の概略図である。肉厚が4.0〜2.5w程度の厚さで
あるガラス板1は、その上辺部の数点が金属製の吊り手
12で支持されて、垂直状に吊持された状態で搬送され
、加熱炉2内に搬入される。この加熱炉2内は、電気ヒ
ーターなどの所要の加熱源により加熱されてガラス板の
成形加工に好適な炉内温度、例えば650〜690℃を
保持した複数のステージからなり、搬入されたガラス板
1は第1のステージの熱間を移送されることで成形加工
に好適な温度、例えば、650℃以上にまで加熱される
。このようにして加熱されたガラス板1は、加熱炉2内
の予備成形室13である第2のステージまで移送され、
左右の翼部8.8を深曲げしたシャープペンドガラスを
形成するための予備成形を行なうべく必要部位がさらに
局部加熱される。この局部加熱は、深曲げ時の折曲げ線
に位置する部位にニクロム線等の加熱手段を近接させる
ことで行なわれる。
The drawing is a schematic representation of the apparatus used in carrying out the method according to the invention. A glass plate 1 having a wall thickness of about 4.0 to 2.5 W is supported at several points on its upper side by metal hangers 12 and transported in a vertically suspended state. , is carried into the heating furnace 2. The inside of this heating furnace 2 consists of a plurality of stages that are heated by a required heat source such as an electric heater to maintain an internal temperature of 650 to 690 degrees Celsius, which is suitable for forming glass sheets. 1 is transferred through the hot stage of the first stage and heated to a temperature suitable for molding, for example, 650° C. or higher. The glass plate 1 heated in this way is transferred to the second stage, which is the preforming chamber 13 in the heating furnace 2.
In order to perform preforming to form sharpened glass in which the left and right wing portions 8.8 are deeply bent, necessary areas are further locally heated. This local heating is performed by bringing a heating means such as a nichrome wire close to a portion located at the bending line during deep bending.

加熱炉2内で予備成形されたガラス板1は、加熱炉2か
ら速やかに搬出され、常温下おかれているプレス装置3
へと搬入され、本成形のためのプレス工程へと入る。プ
レス装置3は、例えば雄型9と雌型10とで構成された
型11を有スるものであり、この型ll内でガラス板1
が所要の形に成形加工され、本成形が行なわれる。この
際のガラス板1は、既に予備成形が施されているもので
あることから、予備成形が施されていな〜°)ものに比
較して本成形に要する時間を短縮化することが可能とな
り、したがって、熱容量が少なく保熱力に劣るガラス板
1の温度が低下する要因を排除することができる。
The glass plate 1 preformed in the heating furnace 2 is quickly carried out from the heating furnace 2 and placed in a press device 3 kept at room temperature.
It is then transported to the factory and goes into the press process for final molding. The press device 3 has a mold 11 composed of, for example, a male mold 9 and a female mold 10, and a glass plate 1 is pressed in this mold 11.
is molded into the desired shape, and the main molding is performed. Since the glass plate 1 at this time has already been preformed, it is possible to shorten the time required for main forming compared to a glass plate that has not been preformed. Therefore, it is possible to eliminate the factors that cause the temperature of the glass plate 1, which has a small heat capacity and poor heat retention ability, to decrease.

本成形のためのプレス工程を経たガラス板lは、直ちに
急冷装置4へと搬送され、強化処理のための冷却工程へ
と入る。ここで使用される急冷装置4は、例えばモータ
ー駆動さする送風機5で起風された空気流を送風管6を
介して吹付は部7まで送風するようにして形成されるも
のであり、吹付は部7には相対する関係で空気流を噴射
するノズル等が設けられている。加熱され強化のための
下限所要温度を保持しているガラス板1は、これらのノ
ズル等を介して両側方向から噴射される空気流により急
激に冷却され、こり風冷時に強化加工が行なわれる。
The glass plate 1 that has undergone the pressing process for main forming is immediately transported to the quenching device 4 and enters the cooling process for strengthening treatment. The quenching device 4 used here is configured to send airflow generated by a blower 5 driven by a motor to a blowing section 7 through a blowing pipe 6, for example. The portion 7 is provided with nozzles or the like for ejecting air streams in opposing relation. The glass plate 1, which has been heated and maintained at the lower limit temperature required for strengthening, is rapidly cooled by air streams injected from both sides through these nozzles, etc., and the strengthening process is performed during the stiff wind cooling.

このようにして一連の加工工程を経たガラス板lは、吊
り手12により吊持されて所定の場所へと搬出され、以
下同様にして作業工程が繰り返される。
The glass plate l that has undergone a series of processing steps in this manner is carried out to a predetermined location by being suspended by the hanger 12, and the working steps are repeated in the same manner.

本発明に係る方法はこのような工程を経るものであるた
め、温度低下をもたらす最大の原因である常温下でのプ
レス工程を、従来にも増して時間短縮することができる
。したがって、急冷開始時までガラス板1に対し強化に
必要な加熱温度を保持させておくことができるので、所
要の強化処理が施された強化ガラスを製造することがで
きる。
Since the method according to the present invention involves such steps, it is possible to shorten the time required for the pressing step at room temperature, which is the biggest cause of temperature drop, than ever before. Therefore, it is possible to maintain the heating temperature necessary for strengthening the glass plate 1 until the start of quenching, so it is possible to manufacture tempered glass that has been subjected to the required strengthening treatment.

下表は、従来方法と本発明に係る方法とを試験的に実施
し、その際に得られた温度降下例を比較した実験値であ
る。
The table below shows experimental values obtained by comparing examples of temperature reduction obtained by experimentally implementing the conventional method and the method according to the present invention.

A:従来方法 B二本発明方法 上表の実験値からも明らかなように、従来方法に依拠し
てガラス板の強化加工を施そうとする場合には、その板
厚が3.5−以下の厚さになると、強化のため急冷開始
時に必要とされる下限の温度650℃に達せず、このた
め、板厚が3、5 m以下の厚さのガラス板に対しては
、十分な強化加工を施すことが事実上不可能であること
が判明した。
A: Conventional method B 2 Method of the present invention As is clear from the experimental values in the table above, when attempting to strengthen a glass plate by relying on the conventional method, the thickness of the glass plate must be 3.5 mm or less. If the thickness of the glass plate is 3.5 m or less, the lower limit temperature of 650°C, which is required at the start of rapid cooling for strengthening, cannot be reached. It turned out that it was virtually impossible to process it.

一方、本発明方法を実施する場合には、板厚がより薄い
2.5−の厚さのガラス板にあってさえ、急冷開始時に
必要とされる下限温度650℃を未だ保持しており、十
分に強化処理を行なうことができる。これは、加熱炉2
内における予備成形室13で予備成形をした後に炉出し
をして本成形に移行させる方法をとったことにより、常
温下にある炉出し後から急冷開始時までの所要時間を従
来方法に比し2秒間短縮することが可能となり、加熱さ
れたガラス板lが常温にさらされる時間はそれだけ短く
なり、温度低下を来す要因を根絶したことによる。
On the other hand, when carrying out the method of the present invention, even with a glass plate having a thinner plate thickness of 2.5 mm, the lower limit temperature of 650°C required at the start of rapid cooling is still maintained, Enough strengthening treatment can be performed. This is heating furnace 2
By adopting a method in which preforming is performed in the preforming chamber 13 inside the chamber, the process is carried out after being taken out of the furnace and then the main molding is started.The time required from taking out the furnace at room temperature to the start of rapid cooling is shorter than that of conventional methods. This is because the time that the heated glass plate l is exposed to room temperature becomes shorter by 2 seconds, and the factors that cause the temperature drop are eliminated.

〔効 果〕〔effect〕

以上述べたように、本発明によれば、加熱炉内で予備成
形を行なった後に本成形に移行する方法を採用したので
、ガラス板に対しても、強化処理を施すための急冷開始
時に必要とされる所定温度を保持させておくことができ
るので、十分な強化処理を施した深曲げガラス板を提供
することができる。
As described above, according to the present invention, a method is adopted in which preforming is performed in a heating furnace and then the main forming is performed. Since the predetermined temperature can be maintained, it is possible to provide a deeply bent glass plate that has been sufficiently strengthened.

【図面の簡単な説明】[Brief explanation of the drawing]

図面は本発明を実施する際に使用される装置の一例を示
すものであり、第1図はその概略正面図、第2図は同側
面図である。 1・・・ガラス板、2・・・加熱炉、3・・・プレス装
置、4・・・急冷装置、5・・・送風機、6・・・送風
管、7・・・吹付は部、8・・・翼部、9・・・雄型、
lO・・・雌型、11・・・型、12−・・吊り手、1
3・・・予備成形室。
The drawings show an example of an apparatus used in carrying out the present invention, and FIG. 1 is a schematic front view thereof, and FIG. 2 is a side view thereof. DESCRIPTION OF SYMBOLS 1...Glass plate, 2...Heating furnace, 3...Press device, 4...Quick cooling device, 5...Blower, 6...Blow pipe, 7...Blowing part, 8 ... wing part, 9 ... male type,
lO...Female type, 11...Type, 12-...Hanging hand, 1
3... Preforming room.

Claims (1)

【特許請求の範囲】[Claims] ガラス板を加熱炉内の熱間で加熱して深曲げのための予
備成形を行なう加熱予備成形工程と、加熱予備成形工程
を経た炉出し後のガラス板に対し深曲げのための本成形
を行なうプレス工程と、プレス工程を経たガラス板を急
冷強化するための冷却工程とからなることを特徴とする
深曲げ薄板強化ガラスの製造方法。
There is a heating preforming process in which a glass plate is heated hot in a heating furnace to preform it for deep bending, and a main forming process for deep bending is performed on the glass plate after it is taken out of the furnace after going through the heating preforming process. 1. A method for producing deep-bent thin sheet tempered glass, comprising a pressing step and a cooling step for rapidly cooling and strengthening the glass sheet that has undergone the pressing step.
JP7349785A 1985-04-09 1985-04-09 Production of deep bent sheet tempered glass Pending JPS61232241A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7349785A JPS61232241A (en) 1985-04-09 1985-04-09 Production of deep bent sheet tempered glass

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7349785A JPS61232241A (en) 1985-04-09 1985-04-09 Production of deep bent sheet tempered glass

Publications (1)

Publication Number Publication Date
JPS61232241A true JPS61232241A (en) 1986-10-16

Family

ID=13519948

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7349785A Pending JPS61232241A (en) 1985-04-09 1985-04-09 Production of deep bent sheet tempered glass

Country Status (1)

Country Link
JP (1) JPS61232241A (en)

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