JPH0649584B2 - Heat treatment method for thick glass articles - Google Patents
Heat treatment method for thick glass articlesInfo
- Publication number
- JPH0649584B2 JPH0649584B2 JP62153498A JP15349887A JPH0649584B2 JP H0649584 B2 JPH0649584 B2 JP H0649584B2 JP 62153498 A JP62153498 A JP 62153498A JP 15349887 A JP15349887 A JP 15349887A JP H0649584 B2 JPH0649584 B2 JP H0649584B2
- Authority
- JP
- Japan
- Prior art keywords
- glass
- air
- cooling
- kcal
- strengthening
- 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.)
- Expired - Fee Related
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B27/00—Tempering or quenching glass products
- C03B27/04—Tempering or quenching glass products using gas
- C03B27/0417—Controlling or regulating for flat or bent glass sheets
Landscapes
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、高層ビルあるいは大面積開口部等の建築用窓
ガラスに最適な厚板ガラス物品の熱処理方法に関する。
詳細には、通常の強化ガラスの強化度までにはいたらな
い微細粒的破砕にならない程度に厚板ガラス物品の破壊
強度をアップするもので、種々の耐圧あるいは耐熱性も
向上して割れにくく、仮令割れたとしても落下するよう
なことが少なく、安全性を向上せしめた厚板ガラス物品
を提供するもので、建築用窓ガラス以外にも種々の内装
材、家具調度品、調理用品、ガラス壜等のガラス物品に
広く採用し得るものである。TECHNICAL FIELD The present invention relates to a heat treatment method for a thick glass article most suitable for a building window glass such as a high-rise building or a large area opening.
Specifically, it increases the breaking strength of thick glass articles to the extent that it does not cause fine grain shattering that does not reach the degree of strengthening of ordinary tempered glass, and various pressure resistance or heat resistance is also improved to prevent breakage. It provides thick glass products that are not dropped even if they break, and have improved safety.In addition to building window glass, various interior materials, furniture furniture, cooking utensils, glass bottles, etc. It can be widely adopted for glass articles.
ガラスは透光性、耐候性等がよく、さらに他の材料に比
して安価であるので建築用窓ガラスをはじめ広く採用さ
れており、住宅用建築物でも大面積の窓ガラスを用いる
こともあるが、とくに年ごとに高層ビル化の一途をたど
っているため、その安全性をより高めることが急務とな
ってきている。すなわち、高層および大面積の窓ガラス
の破壊強度アップ、例えば耐風圧強度や耐熱性等の向上
の確保が必要となってきている。さらには、割れた際に
も高所から破片の落下が発生しにくいように窓枠からは
み出しにくいものが望まれている。Since glass has good transparency and weather resistance, and is cheaper than other materials, it is widely used as architectural window glass, and even residential buildings can use large area window glass. However, as the number of skyscrapers continues to increase year by year, there is an urgent need to further enhance their safety. That is, it is necessary to increase the breaking strength of high-rise and large-area window glass, for example, to improve wind pressure resistance and heat resistance. Further, there is a demand for a material that does not easily protrude from the window frame so that even if it breaks, fragments do not easily drop from a high place.
しかしながら、通常の熱強化ガラスにしたのでは破壊強
度は上がるが、破砕時細かく割れるので問題であり、化
学強化ガラスにしたのでは、破壊強度も大きく、割れた
際も生板ガラスと似たような破砕パターンを示すが、化
学強化処理に多くの時間が必要であって生産コストが高
くなり、圧縮応力層の厚みが薄いので何らかの理由で加
傷された際、その加傷されたところは生板と同程度の強
度しか有さないという問題等があるものであった。However, the breaking strength increases with ordinary heat-strengthened glass, but it is a problem because it breaks finely when crushed.With chemically strengthened glass, the breaking strength is large, and even when broken, it is similar to raw glass. Although it shows a crushing pattern, it takes a lot of time for the chemical strengthening process, the production cost becomes high, and the thickness of the compressive stress layer is thin, so when it is damaged for some reason, the damaged part is a raw plate. There is a problem that it has only the same level of strength as the above.
しかして、従来の風冷法を用い、その冷却度を下げた所
定の強化度を有するガラスが知られている。すなわち、
従来の熱強化ガラスよりもその表面圧縮応力の値を小さ
くするかわりに、内部の引張応力も小さくなるようにし
て、破砕したときにも、従来の熱強化ガラスのように細
かく割れないようにしたものが提案されている。例えば
特公昭５９−２５７３４号公報には、板厚10〜15ｍｍの
ガラス板を 600〜 660℃に加熱した後、ガラス板表面に
50〜 300℃の熱風を吹き付けてガラス板の冷却速度を大
気中の自然放冷より遅くしてガラス板の歪点温度以下ま
で冷却して、この処理されたガラス板の中央引張応力σ
ｔが85〜 200Kg／cm2となり、かつその表面圧縮応力σ
ｃと中央引張応力σｔとの比σｔ／σｃが 1.5〜 2.0の
範囲となるように制御するという方法が開示され、また
特公昭６１−４０６０８号公報にはガラスシート強化方
法およびこの方法により作った強化ガラスシートが記載
され、急冷ガス流を少なくとも１つの局部ガス流とし、
該局部ガス流はガラスシートを急冷ステーションに進行
させる速度に関係する繰返し頻度で脈動させて強化され
たガラスの区域で散在したより高く強化されたガラスの
区域の分布をガラスシートに生じさせるようにすること
が開示されている等が知られている。Therefore, there is known a glass having a predetermined degree of tempering, which is obtained by using the conventional air-cooling method and lowering the degree of cooling. That is,
Instead of making the value of surface compressive stress smaller than that of conventional heat-strengthened glass, the internal tensile stress is also made smaller so that even when shattered, it does not break into pieces like conventional heat-strengthened glass. Things have been proposed. For example, in Japanese Examined Patent Publication No. 59-25734, after heating a glass plate having a plate thickness of 10 to 15 mm to 600 to 660 ° C., the glass plate surface is
The central tensile stress σ of this treated glass sheet was measured by blowing hot air of 50 to 300 ° C to cool the glass sheet to a temperature below the strain point temperature of the glass sheet by making it slower than natural cooling in the atmosphere.
t becomes 85 to 200 kg / cm 2 , and its surface compressive stress σ
A method of controlling so that the ratio σt / σc between c and the central tensile stress σt is in the range of 1.5 to 2.0 is disclosed, and Japanese Patent Publication No. 61-40608 discloses a glass sheet strengthening method and a method for producing the same. A tempered glass sheet is described, wherein the quench gas stream is at least one local gas stream,
The local gas flow is pulsed at a repetition frequency related to the rate at which the glass sheet is advanced to the quench station to cause the glass sheet to have a distribution of areas of higher tempered glass interspersed with areas of tempered glass. It is known that this is done.
前述したように従来例えば８mm以上の板厚のガラス板で
はガラス内部に生ずる一時歪みが大きくなりすぎて強化
度が大きくなりすぎるとか、あるいは、割れが発生する
ことが多くなり、これを防ぐために徐冷条件を種々限定
しなければならず結果的には生産に要する時間も長くな
り、生産性も悪いものとなりコスト高になるという問題
を有した。例えば前記した特公昭５９−２５７３４号公
報に開示された熱処理方法等で解決しようとするもの
の、その処理温度が 600〜 660℃と高く、しかも比較的
大面積のガラス板であるので変形や表面性に問題を生じ
やすいものであり、加えて冷却エアを50〜 300℃と加熱
する装置が必要であるという問題もあるものであった。
さらに前記特公昭６１−４０６０８号公報の方法では、
冷却中にパルス状のエアを、例えば0.2secごとに１つの
脈動を通し、各脈動の保持時間を0.1secにする極めて短
時間の処理でシャープエッジの発生のない強化をめざし
ているが、強化ガラス内の特定の部分の応力分布は変え
られたとしても、所定の強化度を有するガラスシートを
得るにはなお問題があった。As described above, in the conventional glass plate having a plate thickness of 8 mm or more, the temporary strain generated in the glass becomes too large and the degree of strengthening becomes too large, or cracks often occur. There was a problem that the cooling conditions had to be variously limited and, as a result, the time required for production was long, the productivity was poor, and the cost was high. For example, although the heat treatment method disclosed in Japanese Patent Publication No. 59-25734 mentioned above is intended to solve the problem, the treatment temperature is as high as 600 to 660 ° C., and since it is a relatively large area glass plate, the deformation and surface properties However, there is also a problem that a device for heating the cooling air to 50 to 300 ° C. is necessary.
Further, according to the method of the above Japanese Patent Publication No. 61-40608,
While cooling, pulsed air is passed through, for example, one pulsation every 0.2 seconds, and the holding time for each pulsation is set to 0.1 seconds. Even if the stress distribution in specific parts of the glass is changed, there is still a problem in obtaining a glass sheet having a predetermined degree of strengthening.
本発明は、従来のかかる問題に鑑みてなしたものであっ
て、 550〜 600℃に加熱した厚板ガラス物品を特定の熱
伝達係数を有する冷却媒体を組み合せて断続的に特定周
期で冷却するようにすることによって、所定の強化度を
もったガラスが効率よく得られる厚板ガラス物品の熱処
理方法を提供するものである。The present invention has been made in view of such problems in the related art, and it is intended to cool a slab glass article heated to 550 to 600 ° C intermittently in a specific cycle by combining a cooling medium having a specific heat transfer coefficient. By providing a heat treatment method for a thick glass article, a glass having a predetermined degree of strengthening can be efficiently obtained.
すなわち、本発明は、８〜12mm厚のガラス物品を 550〜
600℃に加熱した後、 0.5〜30secの周期でエアを断続
的に吹き付けるとともに、冷却時における熱伝達係数が
吹き付け時において５〜50Kcal／m2・hr・℃の範囲に、
かつ吹き付けない時には２Kcal／m2・hr・℃以下になる
ようにして冷却することを特徴とする厚板ガラス物品の
熱処理方法を提供するものである。That is, the present invention provides a glass article having a thickness of 8 to 12 mm by
After heating to 600 ° C, air is intermittently blown at a cycle of 0.5 to 30 seconds, and the heat transfer coefficient during cooling is in the range of 5 to 50 Kcal / m 2 · hr · ° C during blowing.
Further, the present invention provides a method for heat treating a thick glass article, characterized in that it is cooled so as to be 2 Kcal / m 2 · hr · ° C or less when not sprayed.
ここで、厚板ガラス物品の加熱温度を 550〜 600℃とし
たのは、 550℃未満では粘性流動がほとんどなくなるの
で所定の強化度が得られ難いものの、この温度以上であ
れば 0.5〜30secの周期で断続的にエアを吹き付け、し
かも熱伝達係数を吹き付け時５〜50Kcal／m2・hr・℃と
し、吹き付けない時２Kcal／m2・hr・℃以下にすること
とあわせて行うことで処理時間を短くすることができ、
従来よりも低い温度で処理が可能となったものである。Here, the heating temperature of the thick glass article is set to 550 to 600 ° C, because it is difficult to obtain a predetermined degree of strengthening because viscous flow almost disappears at less than 550 ° C, but if it is above this temperature, a cycle of 0.5 to 30 seconds By intermittently blowing air with a heat transfer coefficient of 5 to 50 Kcal / m 2 · hr · ° C when sprayed and not blowing 2 Kcal / m 2 · hr · ° C or less, the processing time Can be shortened,
The processing can be performed at a lower temperature than before.
また、断続的吹き付けの周期を 0.5〜30sec、好ましく
は１〜10sec としたのは、0.5sec未満より短くするとエ
アを止める効果が小さくなって割れが生じやすくなるた
めであり、 30sec を超えると吹き付けていない時間が
長すぎて生産していく上で時間がかかりすぎるとともに
所定の強化度が得られにくいものとなるためである。The intermittent spraying cycle is set to 0.5 to 30 seconds, preferably 1 to 10 seconds, because if it is shorter than 0.5 seconds, the effect of stopping the air will be small and cracks will easily occur. This is because it takes too much time for production because it is too long, and it becomes difficult to obtain a predetermined degree of strengthening.
さらに、熱伝達係数を吹き付け時５〜50Kcal／m2・hr・
℃、好ましくは10〜20Kcal／m2・hr・℃としたのは、５
Kcal／m2・hr・℃未満では強化度が小さくなりすぎ効果
がなくなり、生産に要する時間が長くかかりすぎるため
であり、50Kcal／m2・hr・℃を超えると強化度が大きく
なりすぎ、冷却中に割れが生じやすくなるためであり、
吹き付けない時２Kcal／m2・hr・℃以下、好ましくは1.
5Kcal／m2・hr・℃以下としたのは、２Kcal／m2・hr・
℃を超えると割れが生じやすくなり、時には強化度が大
きくなりすぎることがあるためである。Furthermore, when spraying a heat transfer coefficient 5 to 50 Kcal / m 2 · hr ・
℃, preferably 10 to 20 Kcal / m 2 · hr · ℃ was 5
If it is less than Kcal / m 2 · hr · ° C, the degree of strengthening will be too small and the effect will be lost, and the time required for production will take too long. If it exceeds 50 Kcal / m 2 · hr · ° C, the degree of strengthening will be too large, This is because cracks are likely to occur during cooling,
2 Kcal / m 2 · hr · ° C or less when not spraying, preferably 1.
5Kcal / m 2 · hr · ° C or less is 2Kcal / m 2 · hr ・
This is because if the temperature exceeds ℃, cracking is likely to occur and sometimes the degree of strengthening becomes too large.
なお、冷却するに際し、例えば、ガラス板全平面にエア
を同時に吹き付けるのではなく、最初にガラス板中央部
にエアを吹き付け、その後タイミングをずらしながらガ
ラス板周縁部に広げて行くよう吹き付ける方がより好ま
しいものであり、そのタイミング差については 0.1〜３
sec／ｍくらいが適当であり、0.1sec／ｍ未満では同時
吹き付けと大差がなくなり、３sec／ｍを超えると不必
要な応力がかかり、かえって割れが生じやすくなるもの
である。When cooling, for example, rather than blowing air to the entire flat surface of the glass plate at the same time, it is better to blow the air to the central portion of the glass plate first and then to spread it to the peripheral portion of the glass plate while shifting the timing. It is preferable, and the timing difference is 0.1 to 3
Sec / m is suitable, and if it is less than 0.1 sec / m, there is no great difference from simultaneous spraying, and if it exceeds 3 sec / m, unnecessary stress is applied and cracking is likely to occur.
さらにまた、熱伝達係数を５〜50Kcal／m2・hr・℃ある
いは２Kcal／m2・hr・℃以下とする手段としては、エア
の風圧を変えること、あるいはガラス板とブラストヘッ
ドのエアノズル先端との間隔を変える等、容易に実施す
ることができるものであり、もちろんエアノズルの径や
ノズルピッチを変えても良いことは言うまでもない。Furthermore, as means for the heat transfer coefficient and 5~50Kcal / m 2 · hr · ℃ or 2Kcal / m 2 · hr · ℃ or less, varying the air pressure of the air, or the air nozzle tip of the glass plate and the blast head Needless to say, the diameter of the air nozzle and the nozzle pitch may be changed.
前述したとおり、厚板ガラス８〜12mm厚のガラス物品を
550〜 600℃の範囲に加熱し、冷却温度とすることによ
り、処理時間を短かくすることができ、生産性も向上す
るが、一方では冷却に際し、割れの発生が起生しやすく
なるというハンディキャップを、エアを常時吹き付ける
のではなくエアを停止することも併せて行うことで解決
し、所定の強化度をもったガラス物品が得られるように
したものである。As mentioned above, glass products with a thickness of 8-12 mm
By heating to a temperature of 550 to 600 ° C and cooling to a lower temperature, the processing time can be shortened and productivity is improved, but on the other hand, cracking is likely to occur during cooling. The cap is solved by stopping the air instead of constantly blowing the air, so that a glass article having a predetermined degree of strengthening can be obtained.
さらにより効果的作用をもたらすには、前述したように
ガラス板表面の周縁部より早く中心部を冷却しはじめる
ようタイミング差をつけることであり、これによりガラ
ス板の端面からの割れの発生をも極力防止することがで
きるものである。To bring about a more effective action, it is necessary to provide a timing difference so that the central portion of the glass plate starts to be cooled earlier than the peripheral portion of the glass plate as described above. It can be prevented as much as possible.
〔実施例〕 以下本発明の一実施例を説明する。[Example] An example of the present invention will be described below.
実施例１ 板厚８mm、大きさ1000×1000mm2のガラス板を 590℃に
加熱した後、熱伝達係数50Kcal／m2・hr・℃のエアで２
秒間吹き付け、熱伝達係数1.5Kcal／m2・hr・℃で２秒
間吹き付けを中止する周期によって断続的に冷却すると
ともに、加えてガラス中央部に0.5sec／ｍ遅れのタイミ
ング差でガラス周縁部にエアが吹き付けられるようにし
て冷却したところ、冷却時の割れ発生はゼロであった。Example 1 A glass plate having a plate thickness of 8 mm and a size of 1000 × 1000 mm 2 was heated to 590 ° C., and then 2 with air having a heat transfer coefficient of 50 Kcal / m 2 · hr · ° C.
The glass is sprayed for 2 seconds and the heat transfer coefficient is 1.5 Kcal / m 2 · hr · ° C for 2 seconds, and it is intermittently cooled by the cycle of stopping the spraying. When cooling was performed by blowing air, no cracks were generated during cooling.
この得られた５試料について、生板ガラスと破壊強度を
対比したところ破壊強度比の平均値が２倍となった。When the breaking strengths of the five obtained samples were compared with the breaking strength, the average value of the breaking strength ratios was doubled.
実施例２〜５ 実施例２〜５については、実施例１と同様な方法で、表
−１に示す条件で行い、その結果も表−１に示すとおり
である。Examples 2 to 5 Examples 2 to 5 are performed in the same manner as in Example 1 under the conditions shown in Table-1, and the results are also shown in Table-1.
比較例１〜５ 実施例と同様な方法で行い、その条件と結果を表−１に
示す。Comparative Examples 1 to 5 The same methods as in Examples were carried out, and the conditions and results are shown in Table-1.
なお、熱伝達係数の測定は大きさ25mmφで３mm厚の銅板
を用いて行ったものである。 The heat transfer coefficient was measured using a copper plate having a size of 25 mmφ and a thickness of 3 mm.
以上前述したことから明らかなように本発明によれば、
特定熱伝達係数のエアでもって特定周期の断続冷却を行
うことで、８〜12mm厚のガラス物品を生板ガラスの 1.5
〜 2.0倍程度の破壊強度を有し、しかも通常強化ガラス
のように細粒破片となる破砕の仕方をすることがないガ
ラスとなり、所定の強化度をもったガラスとなり、より
安全性の高い建築用窓ガラ等として提供できるものであ
り、熱線吸収あるいは反射ガラス板をはじめ種々の厚板
ガラスのほか、他のガラス物品等にも適用できるもので
ある。As is apparent from the above, according to the present invention,
By performing intermittent cooling for a specific period with air having a specific heat transfer coefficient, a glass article with a thickness of 8 to 12 mm can be made into a glass sheet with
~ 2.0 times the breaking strength, which is a glass that does not break into fine particles like ordinary tempered glass and has a predetermined degree of strengthening, making it a safer construction It can be provided as a window glass for windows and the like, and can be applied to various glass sheets such as a heat ray absorbing or reflecting glass plate and other glass articles.
Claims (1)
加熱した後、0.5 〜30sec の周期でエアを断続的に吹き
付けるとともに、冷却時における熱伝達係数が吹き付け
時において５〜50Kcal／m2・hr・℃の範囲に、かつ吹き
付けない時には２Kcal／m2・hr・℃以下になるようにし
て冷却することを特徴とする厚板ガラス物品の熱処理方
法。1. A glass article having a thickness of 8 to 12 mm is heated to 550 to 660 ° C., and then air is intermittently blown at a cycle of 0.5 to 30 seconds, and a heat transfer coefficient at the time of cooling is 5 to 50 Kcal / A method for heat treating a thick glass article, characterized in that cooling is carried out within a range of m 2 · hr · ° C and, when not sprayed, at 2 Kcal / m 2 · hr · ° C or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62153498A JPH0649584B2 (en) | 1987-06-22 | 1987-06-22 | Heat treatment method for thick glass articles |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62153498A JPH0649584B2 (en) | 1987-06-22 | 1987-06-22 | Heat treatment method for thick glass articles |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63319221A JPS63319221A (en) | 1988-12-27 |
| JPH0649584B2 true JPH0649584B2 (en) | 1994-06-29 |
Family
ID=15563874
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62153498A Expired - Fee Related JPH0649584B2 (en) | 1987-06-22 | 1987-06-22 | Heat treatment method for thick glass articles |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0649584B2 (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62153499A (en) * | 1985-12-26 | 1987-07-08 | 清水建設株式会社 | Formwork assembling and overhauling device |
-
1987
- 1987-06-22 JP JP62153498A patent/JPH0649584B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63319221A (en) | 1988-12-27 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |