JPH04209722A - Molding of glass tube - Google Patents
Molding of glass tubeInfo
- Publication number
- JPH04209722A JPH04209722A JP34085490A JP34085490A JPH04209722A JP H04209722 A JPH04209722 A JP H04209722A JP 34085490 A JP34085490 A JP 34085490A JP 34085490 A JP34085490 A JP 34085490A JP H04209722 A JPH04209722 A JP H04209722A
- Authority
- JP
- Japan
- Prior art keywords
- glass
- glass tube
- sleeve
- blow air
- partial pressure
- 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
Links
- 238000004554 molding of glass Methods 0.000 title 1
- 239000011521 glass Substances 0.000 claims abstract description 50
- 239000006060 molten glass Substances 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims description 15
- 239000002184 metal Substances 0.000 abstract description 24
- 229910052760 oxygen Inorganic materials 0.000 abstract description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract 2
- 239000001301 oxygen Substances 0.000 abstract 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract 1
- 229910001873 dinitrogen Inorganic materials 0.000 abstract 1
- 239000007789 gas Substances 0.000 abstract 1
- 238000004031 devitrification Methods 0.000 description 5
- 238000000465 moulding Methods 0.000 description 5
- 230000007935 neutral effect Effects 0.000 description 3
- GOLCXWYRSKYTSP-UHFFFAOYSA-N Arsenious Acid Chemical compound O1[As]2O[As]1O2 GOLCXWYRSKYTSP-UHFFFAOYSA-N 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910018967 Pt—Rh Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B17/00—Forming molten glass by flowing-out, pushing-out, extruding or drawing downwardly or laterally from forming slits or by overflowing over lips
- C03B17/04—Forming tubes or rods by drawing from stationary or rotating tools or from forming nozzles
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
Abstract
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は、ガラス管の成形方法に関するものである。[Detailed description of the invention] [Industrial application field] The present invention relates to a method of forming a glass tube.
［従来の技術］
従来より、ガラス管の成形方法としてダンチー法が広く
用いられている。[Prior Art] The Danchy method has been widely used as a method for forming glass tubes.
ダンチー法は、第１図に示すように、溶融ガラスｌＯを
回転するスリーブ２０上に導き、ブローエアーを供給し
ながらガラスを連続的に引き出して、管状に成形する方
法である。引き出された管状のガラスは、徐々に管径を
縮小し、やがて一定の管径を育するガラス管１１となる
が、その断面形状は、ガラスがスリーブ２０から離れる
地点、いわゆる離型点Ａでの形状がほとんどそのまま維
持される。As shown in FIG. 1, the Danchy method is a method in which molten glass 1O is introduced onto a rotating sleeve 20, and the glass is continuously drawn out while blowing air is supplied to form it into a tubular shape. The drawn out tubular glass gradually reduces its diameter and eventually becomes a glass tube 11 with a constant diameter, but its cross-sectional shape changes at the point where the glass leaves the sleeve 20, the so-called release point A. The shape remains almost the same.
それゆえガラス管の断面形状を常に一定に保つためには
、離型点Ａ付近でのスリーブ２０の表面状態が安定して
いなければならない。このため、スリーブ２０の先端部
にはメタルチップ２１と呼ばれる耐食性を有する耐熱性
金属部材が取り付けられている。Therefore, in order to keep the cross-sectional shape of the glass tube constant, the surface condition of the sleeve 20 near the mold release point A must be stable. For this reason, a heat-resistant metal member called a metal chip 21 having corrosion resistance is attached to the tip of the sleeve 20.
［発明が解決しようとする問題点コ
一般に、ガラスは金属に対して濡れにくいため、第２図
に示すように、メタルチップ２Ｉの端面２１ａにはガラ
スが染み出さない。[Problems to be Solved by the Invention] In general, glass is difficult to wet with metal, so as shown in FIG. 2, glass does not seep into the end surface 21a of the metal chip 2I.
しかしながら、メタルチップ２１の表面は、大気中で酸
化されることがある。特にガラス管成形中は常に高温に
さらされるために酸化被膜が形成されることが多く、メ
タルチップ２１の表面がガラスに濡れやすくなる。この
ため第３図に示すように、メタルチップ２１の端面２１
ａにガラスｌＯが染み出してきて拡がり、離型点でのガ
ラスの断面形状が変形し、引き出されたガラス管１１も
所望の断面形状を得ることが困難になる。また、メタル
チップ端面２１ａに拡がったガラス１０ｍは、そこで滞
留して失透し、失透物が堆積するが、成形条件が変化す
ると、この失透物がガラスＩＯ中に流れだすことがあり
、ブッと呼ばれるガラス欠陥が生じる。However, the surface of the metal chip 21 may be oxidized in the atmosphere. Particularly during glass tube molding, since it is constantly exposed to high temperatures, an oxide film is often formed, and the surface of the metal chip 21 becomes easily wetted by the glass. Therefore, as shown in FIG.
The glass lO oozes out and spreads in a, the cross-sectional shape of the glass at the mold release point is deformed, and it becomes difficult to obtain the desired cross-sectional shape of the drawn glass tube 11. In addition, the glass 10m that has spread to the metal chip end face 21a stays there and devitrifies, and devitrification substances are deposited there, but if the molding conditions change, this devitrification substance may flow into the glass IO. A glass defect called a bulge occurs.
本発明の目的は、常に一定の断面形状が得られるととも
に、メタルチップ端面に滞留したガラスの失透物に起因
するブツを含まないガラス管を製造することが可能なガ
ラス管の成形方法を提供することである。An object of the present invention is to provide a method for forming a glass tube, which can produce a glass tube that always has a constant cross-sectional shape and does not contain lumps caused by glass devitrification accumulated on the end face of a metal chip. It is to be.
［問題を解決するための手段］
本発明者は種々の研究を行った結果、中性雰囲気のガス
をブローエアーとして使用することにより、上記目的が
達成できることを見いだし、本発明として提案するもの
である。[Means for Solving the Problem] As a result of various studies, the present inventor found that the above object can be achieved by using gas in a neutral atmosphere as blow air, and proposes the present invention. be.
即ち、本発明のガラス管の成形方法は、溶融ガラスをス
リーブ上に導き、ブローエアーを供給しながら、ガラス
を連続的に引き出して管状に成形するガラス管の成形方
法において、０□分圧が１Ｏ−ｘＯ〜１Ｏ−２気圧に調
整されたガスをブローエアーとして使用することを特徴
とする。That is, the glass tube forming method of the present invention is a glass tube forming method in which molten glass is guided onto a sleeve, and while blowing air is supplied, the glass is continuously pulled out and formed into a tube shape. It is characterized by using gas adjusted to 1O-xO to 1O-2 atm as blow air.
［作用］
本発明のガラス管の成形方法は、ブローエアーとして０
２分圧が１０−１０〜１０−２気圧に調整されたガスを
使用するために、ガラス管成形中のメタルチップ付近は
中性雰囲気となり、その表面に酸化被膜が形成されにく
い。またガラス管の成形開始以前に、メタルチップ表面
に酸化被膜が形成されている場合においても、成形を開
始して温度が高くなると、酸化被膜が還元されて金属化
する。[Function] The glass tube forming method of the present invention uses 0 as blow air.
Since a gas whose partial pressure is adjusted to 10-10 to 10-2 atmospheres is used, a neutral atmosphere exists near the metal chip during glass tube molding, making it difficult for an oxide film to form on its surface. Further, even if an oxide film is formed on the surface of the metal chip before the start of molding the glass tube, when the temperature rises after the start of molding, the oxide film is reduced and metallized.
また本発明において、０□分圧力月０−１°〜ｌ０−２
気圧に調整されたガスとしては、人体に無害なもの、例
えばＮ２１Ｈｅ ％ Ａ ｒ １Ｃ０２等を単独又は混
合して用いることが好ましい。In addition, in the present invention, 0□ min pressure month 0-1°~l0-2
As the gas adjusted to atmospheric pressure, it is preferable to use one that is harmless to the human body, such as N21He % Ar 1C02, alone or in combination.
なお、０２分圧が１ｏ−１０気圧より低いガスを使用し
た場合には、ガラス中のＡｓ２Ｏ３，５ｂ２０３、Ｐｂ
０等の成分が還元されて金属化し、ガラスを曇らせたり
メタルチップと反応して合金を作ったりするため好まし
くない。逆に、０２分圧がｌｏ−２気圧より高いガスを
使用した場合は、酸化性が強い雰囲気となるため、′メ
タルチップ表面に酸化被膜が形成されやすくなって好ま
しくない。In addition, when using a gas whose 02 partial pressure is lower than 1o-10 atm, As2O3, 5b203, Pb
This is not preferable because components such as 0 are reduced and metallized, clouding the glass or reacting with metal chips to form an alloy. On the other hand, if a gas with a partial pressure of 02 higher than lo-2 atmospheres is used, the atmosphere becomes strongly oxidizing, which is undesirable because an oxide film is likely to be formed on the surface of the metal chip.
［実施例コ
以下、本発明のガラス管の成形方法を実施例に基づいて
説明する。[Example 7] Hereinafter, the method for forming a glass tube of the present invention will be explained based on an example.
第１図は本発明のガラス管の成形方法に使用するダンナ
ー式ガラス管成形装置を示すものであり、スリーブ２０
は、固定具２２、スプリング２３、ナツト２４、及びス
リーブ２０の先端に取り付けられるＰｔ−Ｒｈ製のメタ
ルチップ２１によりスリーブシャフト２５に固定され、
駆動装置２Ｂにより斜下方向に支持されている。またス
リーブシャフト２５はブローエアー供給孔２７を有し、
その上側の開口部はブローバイブ２８を介してブローエ
アー供給器（図示せず）に接続されている。ここで、使
用するブローエアー供給器はＮ Ｏ，分圧が１Ｏ−８気
圧に調整されたＮ２ガスをブローエアーとして供給する
機能を有するものである。FIG. 1 shows a damper-type glass tube forming apparatus used in the glass tube forming method of the present invention.
is fixed to the sleeve shaft 25 by a fixture 22, a spring 23, a nut 24, and a Pt-Rh metal tip 21 attached to the tip of the sleeve 20,
It is supported diagonally downward by the drive device 2B. Further, the sleeve shaft 25 has a blow air supply hole 27,
The upper opening is connected to a blow air supply device (not shown) via a blow vibe 28. Here, the blow air supply device used has the function of supplying N 2 O and N 2 gas whose partial pressure is adjusted to 10-8 atmospheres as blow air.
本発明のガラス管の成形方法において、駆動装置２６に
より回転が与えられているスリーブ２０上に、トラフ（
図示せず）より溶融ガラスｌＯを導き、スリーブ２０の
表面に巻き付け、スリーブ２０の回転と傾斜により、均
質化しながら下方へ移動させる。In the glass tube forming method of the present invention, a trough (
(not shown), the molten glass 1O is guided, wrapped around the surface of the sleeve 20, and moved downward while being homogenized by rotating and tilting the sleeve 20.
次いでメタルチップ２１から離れた管状のガラスにブロ
ーエアーを供給しつつ、引き出すことによりガラス管１
１を得る。このときブローエアーとして吹き込まれるＮ
２ガスは、０２分圧がｌｏ−６気圧に調整されているた
めに、引き出される管状のガラスとメタルチップ２１に
囲まれた空間Ｂには中性雰囲気のガスが充満し、メタル
チップ２１表面に酸化被膜が形成されることがない。Next, while supplying blow air to the tubular glass separated from the metal tip 21, the glass tube 1 is pulled out.
Get 1. At this time, N is blown in as blow air.
Since the partial pressure of the 02 gas is adjusted to lo-6 atm, the space B surrounded by the tubular glass and the metal chip 21 to be drawn out is filled with gas in a neutral atmosphere, and the surface of the metal chip 21 is No oxide film is formed on the surface.
［効果コ
以上説明したように、本発明のガラス管の成形方法によ
れば、ガラス管の成形中、メタルチップの表面に酸化被
膜が形成されないため、溶融ガラスがメタルチップ端面
に拡がらない。それゆえ、離型点におけるガラス管の断
面が常に一定し、所望の断面形状を有するガラス管を得
ることができる。またメタルチップの端面にガラスが滞
留しないため、失透物が生じず、これに起因するブツを
含まないガラス管を製造することが可能である。[Effects] As explained above, according to the method for forming a glass tube of the present invention, no oxide film is formed on the surface of the metal chip during the forming of the glass tube, so molten glass does not spread to the end surface of the metal chip. Therefore, the cross section of the glass tube at the mold release point is always constant, and a glass tube having a desired cross-sectional shape can be obtained. Further, since glass does not remain on the end face of the metal chip, no devitrification is generated, and it is possible to manufacture a glass tube free of particles caused by devitrification.
第１図は、本発明において使用するガラス管成形装置の
概略断面図、第２図は、離型点においてガラスがメタル
チップから良好に離れる状態を示す説明図、第３図は、
離型点においてガラスがメタルチップ端面に拡がってい
る状態を示す説明図である。
ＩＯ・・・溶融ガラス １１・・・ガラス管２０・・
・スリーブ ２１・・・メタルチップＡ・・・離型
点
特許出願人 日本電気硝子株式会社
代表者 岸１）清作
１２＋
ハ
ノ
第 ５５
＼
／
閃
＼
〆
７ａFIG. 1 is a schematic cross-sectional view of the glass tube forming apparatus used in the present invention, FIG. 2 is an explanatory diagram showing the state in which the glass is well separated from the metal chip at the mold release point, and FIG.
FIG. 3 is an explanatory diagram showing a state in which glass spreads to the end face of the metal chip at the mold release point. IO... Molten glass 11... Glass tube 20...
・Sleeve 21...Metal tip A...Mold release point Patent applicant Nippon Electric Glass Co., Ltd. Representative Kishi 1) Seisaku 12+ Hano No. 55 \ / Sen\ 〆7a
Claims (1)
供給しながら、ガラスを連続的に引き出して管状に成形
するガラス管の成形方法において、Ｏ＿２分圧が１０＾
−＾１＾０〜１０＾−＾２気圧に調整されたガスをブロ
ーエアーとして使用することを特徴とするガラス管の成
形方法。(1) In a glass tube forming method in which molten glass is guided onto a sleeve and blow air is supplied, the glass is continuously pulled out and formed into a tube shape, when the O_2 partial pressure is 10^
- A method for forming a glass tube, characterized in that gas adjusted to 1 to 10 to 2 atmospheres is used as blow air.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34085490A JPH04209722A (en) | 1990-11-30 | 1990-11-30 | Molding of glass tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34085490A JPH04209722A (en) | 1990-11-30 | 1990-11-30 | Molding of glass tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04209722A true JPH04209722A (en) | 1992-07-31 |
Family
ID=18340923
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP34085490A Pending JPH04209722A (en) | 1990-11-30 | 1990-11-30 | Molding of glass tube |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04209722A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002028788A1 (en) * | 2000-09-29 | 2002-04-11 | Schott Glas | Device for producing a glass rod |
| GB2376015A (en) * | 2001-06-02 | 2002-12-04 | Zeiss Stiftung | Drawing glass tubing |
-
1990
- 1990-11-30 JP JP34085490A patent/JPH04209722A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002028788A1 (en) * | 2000-09-29 | 2002-04-11 | Schott Glas | Device for producing a glass rod |
| US7343761B2 (en) | 2000-09-29 | 2008-03-18 | Carl-Zeiss-Stiftung | Device for producing a glass rod |
| GB2376015A (en) * | 2001-06-02 | 2002-12-04 | Zeiss Stiftung | Drawing glass tubing |
| GB2376015B (en) * | 2001-06-02 | 2005-06-29 | Zeiss Stiftung | Device for reduction of gas flow |
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