JPH0794331B2 - Quartz tube or quartz rod manufacturing method - Google Patents
Quartz tube or quartz rod manufacturing methodInfo
- Publication number
- JPH0794331B2 JPH0794331B2 JP25327989A JP25327989A JPH0794331B2 JP H0794331 B2 JPH0794331 B2 JP H0794331B2 JP 25327989 A JP25327989 A JP 25327989A JP 25327989 A JP25327989 A JP 25327989A JP H0794331 B2 JPH0794331 B2 JP H0794331B2
- Authority
- JP
- Japan
- Prior art keywords
- quartz
- roller
- torque
- quartz rod
- rod
- 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
- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
- C03B37/01—Manufacture of glass fibres or filaments
- C03B37/012—Manufacture of preforms for drawing fibres or filaments
- C03B37/01205—Manufacture of preforms for drawing fibres or filaments starting from tubes, rods, fibres or filaments
- C03B37/01225—Means for changing or stabilising the shape, e.g. diameter, of tubes or rods in general, e.g. collapsing
- C03B37/0126—Means for supporting, rotating, translating the rod, tube or preform
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Glass Melting And Manufacturing (AREA)
- Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)
- Manufacture, Treatment Of Glass Fibers (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は石英管または石英棒の製造方法、特には高度に
外径がコントロールされていることから光ファイバーな
どに好適とされる、石英管または石英棒の製造方法に関
するものである。DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a method for producing a quartz tube or a quartz rod, and in particular, a quartz tube or a quartz tube which is suitable for an optical fiber because the outer diameter is highly controlled. The present invention relates to a method for manufacturing a quartz rod.
（従来の技術） 光ファイバーについてはその性能面から外径が正確に制
御されたものであることが重要なものとされているが、
この寸法精度は延伸する前のプリフォーム用としての石
英管または石英棒の寸法精度に大きく依存している。(Prior Art) It is important that the outer diameter of an optical fiber is precisely controlled from the viewpoint of its performance.
This dimensional accuracy largely depends on the dimensional accuracy of a quartz tube or a quartz rod for a preform before being stretched.
一方、光ファイバー用プリフォームは一般にサイズが小
さいので連続した安定延伸は望めない。On the other hand, since the preform for optical fiber is generally small in size, continuous stable drawing cannot be expected.
このため、寸法精度の高い石英管または石英棒の高効率
取得が技術上で重要な課題とされており、この課題解決
の手段について数多くの提案がなされている。Therefore, it is an important technical issue to obtain a highly efficient quartz tube or quartz rod with high dimensional accuracy, and many proposals have been made for solving this problem.
しかして、特に均一な外径をもつ石英管または石英棒の
調整については延伸加工における引取り速度の自動制御
に関する各種の方法や装置に関するものが多く提案され
ているが、この延伸方法については管状または棒状の石
英ガラスを水平に保持して水平方向に延伸するか、これ
を鉛直に保持して下方に延伸する方法が採用されてい
る。For the adjustment of a quartz tube or a quartz rod having a uniform outer diameter, many methods and devices have been proposed for automatic control of the take-up speed in the drawing process. Alternatively, a method of holding a rod-shaped quartz glass horizontally and stretching it horizontally or holding it vertically and stretching it downward is adopted.
（発明が解決しようとする課題） しかし、この水平延伸方法では小寸法のプリフォームを
繰返し延伸するのに適し、石英ガラス材を回転している
限り重量の影響を受けないので径の変化は少ないなどの
利点はあるが、この場合には延伸時にたわみが生じ、こ
れがガラス材の曲がりの原因になるという欠点があり、
したがって必ずしも満足する結果を与えないという不利
があり、一方、鉛直下方向に延伸する方法では大型寸法
に適し、長尺化が可能で重量方向に引伸ばされるもので
あることから曲がりは極めて少なく、したがってガラス
材に回転を与えなくても曲がりの少ない真円性のすぐれ
た石英管または石英棒が得られるという利点はあるもの
の、これには石英管または石英棒が加熱軟化されている
ために溶融部が自重で下方に張力がかかるために、下方
の重量変動と共に延伸張力の大きさや向きが変り、正確
に径を制御することが困難であるという欠点がある。(Problems to be Solved by the Invention) However, this horizontal stretching method is suitable for repeatedly stretching a small-sized preform, and since the quartz glass material is not affected by weight as long as the quartz glass material is rotated, the change in diameter is small. Although there are advantages such as, in this case there is a disadvantage that bending occurs during stretching, which causes bending of the glass material,
Therefore, there is a disadvantage that it does not always give a satisfactory result, on the other hand, the method of stretching in the vertical downward direction is suitable for large dimensions, can be elongated and is stretched in the weight direction, so there is very little bending, Therefore, although there is an advantage that a quartz tube or quartz rod with excellent roundness with little bending can be obtained without rotating the glass material, this is because the quartz tube or quartz rod is heated and softened, so that it does not melt. Since the portion is subjected to downward tension due to its own weight, the magnitude and direction of the stretching tension change with downward weight fluctuation, and it is difficult to control the diameter accurately.
（課題を解決するための手段） 本発明はこのような不利を解決した石英管または石英棒
の製造方法に関するものであり、これは石英管または石
英棒を加熱軟化させて縦方向に引き伸ばし、規定の目標
形状とする石英管または石英棒の製造方法において、延
伸駆動ローラーのトルク変動を検知してこれを制御ロー
ラーにフィードバックし、延伸駆動ローラーのトルクが
正方向で常に一定値となるように制御ローラーによって
延伸中の石英管または石英棒に加えるトルクを制御する
ことを特徴とする石英管または石英棒の製造方法に関す
るものである。(Means for Solving the Problem) The present invention relates to a method for producing a quartz tube or a quartz rod that solves such disadvantages, which is characterized in that a quartz tube or a quartz rod is heated and softened and stretched in a longitudinal direction to be defined. In the method for manufacturing the quartz tube or quartz rod with the target shape of 1., the torque fluctuation of the stretching drive roller is detected and fed back to the control roller, and the torque of the stretching drive roller is controlled to always be a constant value in the positive direction. The present invention relates to a method for producing a quartz tube or a quartz rod, characterized in that a torque applied to the quartz tube or the quartz rod being drawn is controlled by a roller.
すなわち、本発明者らは石英管または石英棒を精度よく
延伸加工する方法について種々検討した結果、石英管ま
たは石英棒を鉛直に保持し、これを加熱軟化させてから
延伸する際、延伸駆動ローラー（以後駆動ローラーとい
う）と制御ローラから成るものとし、駆動ローラーで石
英管または石英棒の重量の影響をなくするために、この
トルクを制御部にフィードバックし、制御ローラーにフ
ィードバックし、制御ローラーではこれにもとずいて石
英等または石英棒に加えるトルクを制御して駆動ローラ
ーのトルクを正方向で常に一定値に成るように制御する
ようにすれば溶融された石英管または石英棒の延伸速度
がその自重を補償した速度で制御されるので、外径が精
度よくコントロールされた延伸加工物を得ることができ
るということを見出して本発明を完成させた。That is, as a result of various studies on the method of accurately stretching a quartz tube or a quartz rod, the present inventors held a quartz tube or a quartz rod in a vertical state, heat-softened it, and then stretched it while stretching it. This torque shall be fed back to the control unit and fed back to the control roller in order to eliminate the influence of the weight of the quartz tube or quartz rod on the drive roller. On the other hand, if the torque applied to the quartz or quartz rod is controlled to control the torque of the drive roller so that it will always be a constant value in the positive direction, the stretching speed of the fused quartz tube or quartz rod Since it is controlled at a speed that compensates for its own weight, it is possible to obtain a drawn product whose outer diameter is accurately controlled. The present invention has been completed by.
（作用） 以下にこれを添付の図面にもとづいて説明する。(Operation) This will be described below with reference to the accompanying drawings.
第１図は本発明の方法にもとづいて石英棒を引下げ延伸
加工する場合を示した縦断面図、第２図は他の例の実施
例図、第３図は本発明の方法にもとづいて石英棒を引上
げ延伸加工する場合を示した縦断面図、第４図は従来法
による石英棒を引下げ延伸加工方法を示した縦断面図で
ある。FIG. 1 is a longitudinal sectional view showing a case where a quartz rod is pulled down and stretched according to the method of the present invention, FIG. 2 is an embodiment diagram of another example, and FIG. 3 is a quartz according to the method of the present invention. FIG. 4 is a vertical cross-sectional view showing a case of pulling up and drawing a rod, and FIG. 4 is a vertical cross-sectional view showing a method of pulling down and drawing a quartz rod by a conventional method.
第４図に示した従来法では径がφ１である石英棒１が速
度V1で電気炉２に導入され、ここで加熱軟化された後、
トルクメーター付きの駆動ローラー３により速度V2で延
伸され、径φ２の製品４が連続的に作成されるのである
が、第４図ａ）に示したように延伸のスタート時に駆動
ローラー３にかかるトルク（トルクは図中矢印で示す。
第１〜第４図以下同じ）は石英棒１を引き伸ばす力ω１
のみであり、製品４は殆んどないのでその重量ω２は無
視できるし、このトルクは引張り力の方向と同一方向と
なるのでこれを正方向（＋）とする。延伸温度が低いと
延伸力ω１が大きく石英棒がローラー上でのすべりを発
生したり、精密なコントロールができないので、十分高
温にする必要がある。この条件で延伸を続けていると第
４図ｂ）に示したように、製品４がだんだん長くなり、
その重量ω２が増加すると駆動ローラー３にかかる力は
ローラーのトルクをω２に対応して逆向きとすることが
必要で、延伸の力ω１に要するトルクよりも自重で下方
に引張られる力ω２のほうが大きくなった場合には製品
４の落下を防止するためには駆動ローラー３にかかるト
ルク値はω１−ω２＝△ω＜０となって第５図に示すよ
うな負値を示す。In the conventional method shown in FIG. 4, a quartz rod 1 having a diameter of φ 1 is introduced into an electric furnace 2 at a velocity V 1 and is heated and softened therein,
The product 4 having a diameter φ 2 is continuously drawn by the driving roller 3 with a torque meter at a speed V 2 , and as shown in FIG. 4 a), the driving roller 3 is drawn at the start of the drawing. Such torque (torque is indicated by an arrow in the figure).
The same applies to FIGS. 1 to 4 below) is the force ω 1 for stretching the quartz rod 1.
Since there is almost no product 4, its weight ω 2 can be ignored, and since this torque is in the same direction as the direction of the tensile force, this is the positive direction (+). When the stretching temperature is low, the stretching force ω 1 is large and the quartz rod causes slipping on the roller, and precise control cannot be performed. Therefore, the temperature must be sufficiently high. If stretching is continued under these conditions, as shown in FIG. 4 b), the product 4 becomes gradually longer,
When the weight ω 2 increases, the force applied to the drive roller 3 needs to reverse the roller torque corresponding to ω 2 , and the force pulled downward by its own weight is larger than the torque required for the stretching force ω 1. When ω 2 becomes larger, in order to prevent the product 4 from falling, the torque value applied to the drive roller 3 becomes ω 1 −ω 2 = Δω <0 and a negative value as shown in FIG. Indicates.
光通信用石英棒や高精度の要求される他の石英材料の加
工においては駆動ローラーの速度制御が非常に重要であ
り、微小なテーパー部や凹凸部を鋭敏に制御するために
は電気的な外乱を最小限に制御しておく必要があるの
で、本発明の方法ではこの石英棒の引き下げ延伸加工は
第１図、第２図に示した方法で行なわれる。In processing quartz rods for optical communication and other quartz materials that require high precision, speed control of the drive roller is very important.To sharply control minute taper and uneven parts, electrical control is required. Since it is necessary to control the disturbance to the minimum, in the method of the present invention, the pulling down and drawing process of the quartz rod is performed by the method shown in FIGS. 1 and 2.
すなわち、本発明の方法では第２図に例示したように駆
動ローラー３のトルクの向きが正逆反転することがない
ように、石英棒１を引き伸ばす力ω１と製品４の重量ω
２よりも大きい力ω３（この場合負力）を駆動ローラー
ω１に加えておけば、駆動ローラー３のトルクの方向は
常に負（−）となり、正逆反転することはないが、製品
４が長尺品であるときにはこれを途中で切断したり、ま
た径の異なるものを加工する場合などではその作業性に
問題がある。That is, in the method of the present invention, the force ω 1 for stretching the quartz rod 1 and the weight ω of the product 4 so that the direction of the torque of the drive roller 3 is not reversed in the normal direction as illustrated in FIG.
If a force ω 3 (negative force in this case) larger than 2 is applied to the drive roller ω 1 , the direction of the torque of the drive roller 3 is always negative (-), and there is no forward / reverse reversal. When it is a long product, it has a problem in workability when it is cut in the middle or when products having different diameters are machined.
そこで、本発明の方法では第１図に示したように、駆動
ローラー３にかかるトルクが正方向で一定になるよう
に、駆動ローラー３の信号を制御ローラー５にフィード
バックさせて制御ローラ５に負方向の力を発生させ、製
品４の剛性を利用してこれを駆動ローラー３に伝達させ
れば駆動ローラー３のトルク値の向きが常に正の一定の
値ω１となるので、延伸される製品４の外径精度が非常
に高くなることが確認された。Therefore, in the method of the present invention, as shown in FIG. 1, the signal of the drive roller 3 is fed back to the control roller 5 so that the torque applied to the drive roller 3 becomes constant in the positive direction. If a force in the directional direction is generated and transmitted to the drive roller 3 by utilizing the rigidity of the product 4, the direction of the torque value of the drive roller 3 always becomes a constant positive value ω 1, and thus the product to be stretched. It was confirmed that the outer diameter accuracy of No. 4 was extremely high.
この際、駆動ローラー３をトルクメーター付のローラー
として、制御ローラー５を電磁ブレーキ付ローラーとす
ることが良い。At this time, it is preferable that the drive roller 3 is a roller with a torque meter and the control roller 5 is a roller with an electromagnetic brake.
なお、この第１図、第２図に示したものはいずれも加熱
軟化させた石英棒１を鉛直方向に引下げる場合を示して
ものであるが、これは第３図に示すように引上げる場合
も同様であり、この場合はトルクメーター付きの駆動ロ
ーラー３で検出された引伸ばされた石英棒４の自重は延
伸張力に加算され、ローラー３のトルクの向きは変らな
いので一段ローラーのみで延伸できる特徴がある。1 and 2 show the case where the heat-softened quartz rod 1 is pulled down in the vertical direction, which is pulled up as shown in FIG. This is also the case. In this case, the weight of the stretched quartz rod 4 detected by the driving roller 3 with a torque meter is added to the stretching tension, and the direction of the torque of the roller 3 does not change. It has the characteristic that it can be stretched.
（実施例） つぎに本発明の実施例をあげる。(Example) Next, the Example of this invention is given.
実施例 第１図に示した装置を用いて外径94mmφ、長さ800mm、
重量11.3kgの石英ガラス棒を送り速度15mm/分、引取り
速度83mm/分で電気炉内で装入し、約2,000℃に加熱して
軟化させ、これを駆動ローラーを用いて引取り速度82.7
mm/分で引下げたところ、これはスタートトルクが正方
向で最大55gfmと検出された。Example Using the apparatus shown in FIG. 1, an outer diameter of 94 mmφ, a length of 800 mm,
A quartz glass rod weighing 11.3 kg is charged in an electric furnace at a feed rate of 15 mm / min and a take-up rate of 83 mm / min, heated to about 2,000 ° C to soften it, and a take-up rate of 82.7 using a drive roller.
When it was lowered at mm / min, the start torque was detected as 55 gfm at maximum in the positive direction.
ついでこのトルクを電磁ブレーキを有する制御ローラー
に結合して、このトルク値を保証するように引下げたと
ころ、安定して延伸され外径が40.7mmφで長さが2,760m
mである石英棒を±0.3mmで得ることができた。Then, this torque was connected to a control roller with an electromagnetic brake, and when it was pulled down to guarantee this torque value, it was stably stretched and had an outer diameter of 40.7 mmφ and a length of 2,760 m.
It was possible to obtain a quartz rod having an m of ± 0.3 mm.
第１図、第２図、第３図は本発明の方法による石英棒の
製造方法の縦断面図を示したものであり、第４図は従来
法による石英棒製造方法の縦断面図、また第５図は駆動
ローラーにかかるトルク値の変化を示したグラフであ
る。 1,4……石英棒、２……電気炉 ３……延伸駆動ローラー ５……制御ローラー1, 2 and 3 are longitudinal sectional views of a method for producing a quartz rod by the method of the present invention, and FIG. 4 is a longitudinal sectional view of a conventional method for producing a quartz rod, FIG. 5 is a graph showing changes in the torque value applied to the drive roller. 1,4 ...... Quartz rod, 2 ... Electric furnace 3 ... Stretching drive roller 5 ... Control roller
Claims (2)
向に引き伸ばし、規定の目標形状とする石英管または石
英棒の製造方法において、延伸駆動ローラーのトルク変
動を検知してこれを制御ローラーにフィードバックし、
延伸駆動ローラーのトルクが正方向で常に一定値となる
ように制御ローラーによって延伸中の石英管または石英
棒に加えるトルクを制御することを特徴とする石英管ま
たは石英棒の製造方法。1. A method of manufacturing a quartz tube or a quartz rod in which a quartz tube or a quartz rod is heated and softened and stretched in the longitudinal direction to obtain a prescribed target shape, and a torque fluctuation of a stretching drive roller is detected to control it. Feedback to
A method for producing a quartz tube or a quartz rod, characterized in that the torque applied to the quartz tube or the quartz rod being stretched is controlled by a control roller so that the torque of the stretching drive roller is always a constant value in the positive direction.
ローラーであり、制御ローラーが電磁ブレーキ付きロー
ラーである請求項１に記載の石英管または石英棒の製造
方法。2. The method for producing a quartz tube or a quartz rod according to claim 1, wherein the stretching drive roller is a roller with a torque meter, and the control roller is a roller with an electromagnetic brake.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25327989A JPH0794331B2 (en) | 1989-09-28 | 1989-09-28 | Quartz tube or quartz rod manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25327989A JPH0794331B2 (en) | 1989-09-28 | 1989-09-28 | Quartz tube or quartz rod manufacturing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03115131A JPH03115131A (en) | 1991-05-16 |
| JPH0794331B2 true JPH0794331B2 (en) | 1995-10-11 |
Family
ID=17249074
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25327989A Expired - Fee Related JPH0794331B2 (en) | 1989-09-28 | 1989-09-28 | Quartz tube or quartz rod manufacturing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0794331B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101441756B1 (en) * | 2012-01-19 | 2014-09-17 | 신에쓰 가가꾸 고교 가부시끼가이샤 | Method and device for drawing glass preform |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6532776B1 (en) | 1997-06-27 | 2003-03-18 | Shin-Etsu Chemical Co., Ltd. | Method and apparatus for fusing an optical fiber preform |
| DE69931825T8 (en) | 1998-11-05 | 2007-09-20 | Shin-Etsu Chemical Co., Ltd. | Method and apparatus for producing a preform and an optical fiber from the preform |
| DE102012107338B4 (en) * | 2012-08-09 | 2015-06-18 | Schott Ag | Method for forming an elongated glass body |
| WO2016060646A1 (en) | 2014-10-14 | 2016-04-21 | Heraeus Tenevo Llc | Apparatus and method for preform or tube drawing based on its viscosity |
| JP6965283B2 (en) * | 2016-06-07 | 2021-11-10 | コーニング インコーポレイテッド | Methods and Equipment for Forming Glass Tubes from Glass Base Materials |
-
1989
- 1989-09-28 JP JP25327989A patent/JPH0794331B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101441756B1 (en) * | 2012-01-19 | 2014-09-17 | 신에쓰 가가꾸 고교 가부시끼가이샤 | Method and device for drawing glass preform |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03115131A (en) | 1991-05-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |