JP2000302470A - Drawing of glass base material - Google Patents
Drawing of glass base materialInfo
- Publication number
- JP2000302470A JP2000302470A JP11322699A JP11322699A JP2000302470A JP 2000302470 A JP2000302470 A JP 2000302470A JP 11322699 A JP11322699 A JP 11322699A JP 11322699 A JP11322699 A JP 11322699A JP 2000302470 A JP2000302470 A JP 2000302470A
- Authority
- JP
- Japan
- Prior art keywords
- glass
- glass rod
- base material
- take
- glass base
- 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.)
- Granted
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B23/00—Re-forming shaped glass
- C03B23/04—Re-forming tubes or rods
- C03B23/047—Re-forming tubes or rods by drawing
-
- 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
- C03B37/0124—Means for reducing the diameter of rods or tubes by drawing, e.g. for preform draw-down
-
- 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
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、ガラス母材を所定
の外径に延伸して、一定外径のガラスロッド（例えば、
光ファイバ母材）を得るガラス母材延伸方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of stretching a glass base material to a predetermined outer diameter and forming a glass rod having a fixed outer diameter (for example,
The present invention relates to a glass preform stretching method for obtaining an optical fiber preform.
【０００２】[0002]
【従来の技術】従来、ガラス母材の延伸、特に大型ガラ
ス母材の延伸は、先ず、加熱炉に送り込まれた大型ガラ
ス母材を発熱体で加熱し、引取り機構により引取り力が
加えられ所望の直径へ延伸される。このとき、所望の外
径へ延伸されたガラスロッドは、引取り機構でのガラス
ロッド把持機構によりある大きさの力で把持され、大型
ガラス母材は該把持機構とガラスロッドの間で生じた摩
擦力以下の大きさの引取り力で延伸される。2. Description of the Related Art Conventionally, in elongating a glass base material, in particular, in elongating a large glass base material, first, a large glass base material fed into a heating furnace is heated by a heating element, and a take-off force is applied by a take-off mechanism. And stretched to the desired diameter. At this time, the glass rod stretched to a desired outer diameter was gripped with a certain amount of force by the glass rod gripping mechanism in the pulling mechanism, and a large glass preform was generated between the gripping mechanism and the glass rod. The film is stretched with a take-off force smaller than the friction force.
【０００３】[0003]
【発明が解決しようとする課題】一般に大型ガラス母材
は、この下端に取り付けられたダミーロッドの部分で引
取り機構のガラスロッド把持機構により把持され、引取
り力が加えられて延伸される。このときガラス母材の形
状や加熱炉の特性、運転条件等により加熱炉の加熱軟化
部の温度は必要以上に上昇しやすく、延伸を行うには、
加熱軟化部にあるガラス母材の粘度が小さくなりすぎ、
望ましい値以下となることがある。加熱軟化部にあるガ
ラス母材の粘度が大きいときは、ガラス母材の自重はこ
の供給機構部で支持され、ガラス母材の各部には引張応
力が作用しているが、加熱軟化部にあるガラス母材の粘
度が小さくなりすぎると、延伸されたガラスロッド部分
にはもはや引張応力が作用せず、自重による圧縮応力が
作用する。このため延伸中のガラス母材は加熱軟化部に
おいて座屈を起こし、延伸の結果得られたガラスロッド
の真直度が著しく低下する。従って、引張り力が大きい
ほど、延伸されたガラスロッドの真直度は良好となる。Generally, a large glass base material is gripped by a glass rod gripping mechanism of a pulling mechanism at a portion of a dummy rod attached to a lower end thereof, and is stretched by applying a pulling force. At this time, depending on the shape of the glass base material and the characteristics of the heating furnace, the operating conditions, etc., the temperature of the heating softening portion of the heating furnace is likely to rise more than necessary, and in order to perform stretching,
The viscosity of the glass base material in the heat softening part is too small,
It may be less than the desired value. When the viscosity of the glass base material in the heating softening part is large, the own weight of the glass base material is supported by this supply mechanism, and tensile stress acts on each part of the glass base material, but it is in the heating softening part. If the viscosity of the glass base material is too small, the tensile stress no longer acts on the stretched glass rod portion, but the compressive stress due to its own weight acts. For this reason, the glass base material being stretched buckles in the heat-softened portion, and the straightness of the glass rod obtained as a result of the stretching is significantly reduced. Therefore, the greater the tensile force, the better the straightness of the drawn glass rod.
【０００４】逆に、大型ガラス母材の形状や加熱炉の特
性、運転条件等によりガラス母材の加熱軟化部の温度が
延伸に望ましい温度とされる温度まで上昇せず、ガラス
母材の加熱軟化部の粘度が設定値より大きくなる場合が
ある。このような場合、引取り機構により大型ガラス母
材に引張り力が作用しているため、延伸後のガラスロッ
ドの真直度は良好となる。しかしながら、引取り機構で
母材へ作用させる引取り力が大きすぎるために、例え
ば、以下に挙げるような弊害を生じる。On the contrary, the temperature of the heat-softening portion of the glass base material does not rise to a temperature desired for stretching due to the shape of the large glass base material, the characteristics of the heating furnace, the operating conditions, and the like. The viscosity of the softened part may be larger than the set value. In such a case, since the pulling mechanism applies a tensile force to the large glass base material, the straightness of the drawn glass rod becomes good. However, since the take-off force applied to the base material by the take-off mechanism is too large, for example, the following adverse effects occur.
【０００５】引取り機構は、この把持機構で例えばチャ
ックなどを用いてガラスロッドを把持し、ガラスロッド
とチャックの間に生じる摩擦力を介して大型ガラス母材
の加熱軟化部に引取り力を作用させている。大きな引取
り力を得るには、引取り機構の把持機構によるガラスロ
ッドの把持力を大きくしなければならない。また、大き
な把持力を得るには大きな駆動装置が必要であり、大き
な駆動装置は高価である。駆動装置が大きくなれば消費
するエネルギー量、例えば電力量も増大する。従って、
大きすぎる引張り力は、延伸装置の設備費および稼動費
を増大させ、かつ駆動装置が大きいと稼動時に発生する
騒音も大きくなり、作業環境を悪化させる。The take-off mechanism grips the glass rod using, for example, a chuck or the like, and applies a take-up force to the heat-softening portion of the large glass base material through a frictional force generated between the glass rod and the chuck. Is working. In order to obtain a large pulling force, the gripping force of the glass rod by the gripping mechanism of the pulling mechanism must be increased. Further, a large driving device is required to obtain a large gripping force, and the large driving device is expensive. As the size of the driving device increases, the amount of energy consumed, for example, the amount of electric power also increases. Therefore,
An excessively large pulling force increases the equipment cost and operating cost of the stretching device, and if the driving device is large, the noise generated at the time of operation also increases, thereby deteriorating the working environment.
【０００６】また、延伸後のガラスロッドを大きな把持
力で把持すると、延伸後のガラスロッドの表面に傷が付
いたり微小な割れを発生することがある。これらの傷や
割れは、延伸後の火炎研磨によって除去できる場合もあ
るが、傷や割れの程度によっては除去できない場合もあ
る。火炎研磨によって除去できる程度の傷や割れであっ
ても、その傷や割れを除去するために火炎研磨工程を必
要とするのでガラスロッドの生産性を悪化させる。火炎
研磨によって除去できない傷や割れがあると、その部分
は廃棄しなければならず、歩留まりの低下をまねく。従
って、大きすぎる引取り力は生産性の観点からも避ける
べきである。Further, if the drawn glass rod is gripped with a large gripping force, the surface of the drawn glass rod may be damaged or may have minute cracks. These flaws and cracks may be removed by flame polishing after stretching in some cases, but may not be removed depending on the degree of flaws or cracks. Even if the scratches and cracks can be removed by the flame polishing, a flame polishing process is required to remove the scratches and cracks, thereby deteriorating the productivity of the glass rod. If there are any scratches or cracks that cannot be removed by flame polishing, the portion must be discarded, resulting in a decrease in yield. Therefore, excessively large take-off force should be avoided from the viewpoint of productivity.
【０００７】大型ガラス母材の加熱軟化部に対して大き
な引取り力を作用させ延伸すると、延伸後のガラスロッ
ドに大きな残留歪みが残り、該ガラスロッドから線引き
された光ファイバにもその歪みの影響が残る。このた
め、光ファイバの光学特性、例えばカットオフ波長など
に影響を及ぼし、光ファイバの光学特性が設計通りに得
られないことがある。従って、大型ガラス母材の加熱軟
化部に作用させる引取り力は、ある値以下に制限されな
ければならない。When a large pulling force is applied to the heat-softened portion of the large glass base material to stretch the glass rod, a large residual strain remains in the drawn glass rod, and the optical fiber drawn from the glass rod also suffers from the distortion. The effect remains. For this reason, the optical characteristics of the optical fiber, such as the cutoff wavelength, are affected, and the optical characteristics of the optical fiber may not be obtained as designed. Therefore, the take-off force applied to the heat-softened portion of the large glass base material must be limited to a certain value or less.
【０００８】本発明は、上記事情に鑑みてなされたもの
であり、大型ガラス母材の加熱軟化部に作用させる引取
り力をある値以下に制限することにより、大きな駆動装
置を必要とせず、延伸後のガラスロッドの表面に傷が付
いたり微小な割れを発生することなく、また、大きな残
留歪みのないガラスロッドを提供することを課題として
いる。The present invention has been made in view of the above circumstances, and does not require a large driving device by limiting a take-off force applied to a heat-softening portion of a large glass base material to a certain value or less. It is an object of the present invention to provide a glass rod which is free from scratches or small cracks on the surface of the drawn glass rod, and free from large residual distortion.
【０００９】[0009]
【課題を解決するための手段】本発明は上記課題を解決
してなり、第一の発明は、ガラス母材を加熱延伸して、
所定の外径を有するガラスロッドを得るガラス母材延伸
方法であって、延伸されたガラスロッドの外径、ガラス
ロッドの引取り距離およびガラスロッドに作用する引取
り力を検出し、ガラスロッドの外径と引取り距離からガ
ラスロッドの自重を算出し、前記ガラスロッドに作用す
る引取り力からガラスロッドの自重を減算して、ガラス
母材に対する加熱軟化部での引取り力を求め、加熱軟化
部での該引取り力を７ｋｇ以上、８０ｋｇ以下とするも
のである。なお、引取り力が７ｋｇ未満では、ガラス母
材に対する延伸力が殆どガラスロッドの自重のみとな
り、得られるガラスロッドの真直度が低くなる。また、
８０ｋｇを超えると、ガラスロッドの外径制御が困難と
なる。Means for Solving the Problems The present invention has solved the above-mentioned problems, and the first invention is to heat and stretch a glass base material,
A glass base material stretching method for obtaining a glass rod having a predetermined outer diameter, comprising detecting an outer diameter of a stretched glass rod, a pulling distance of the glass rod, and a pulling force acting on the glass rod, and The self-weight of the glass rod is calculated from the outer diameter and the take-off distance, and the self-weight of the glass rod is subtracted from the take-up force acting on the glass rod, thereby obtaining the take-off force of the heating and softening portion with respect to the glass base material, and The take-off force at the softened portion is set to 7 kg or more and 80 kg or less. If the take-off force is less than 7 kg, the stretching force on the glass base material is almost only the own weight of the glass rod, and the straightness of the obtained glass rod is low. Also,
If it exceeds 80 kg, it becomes difficult to control the outer diameter of the glass rod.
【００１０】第二の発明は、ガラス母材を加熱延伸させ
る加熱炉、ガラス母材を供給する供給機構及び引取り機
構を有するガラス母材延伸装置において、ガラス母材の
供給機構部と引取り機構部の両方又はいずれか一方に引
取り力検出器を配設し、ガラス母材の加熱軟化部におい
てガラス母材に作用する引張り応力を０．０４３ｋｇｆ
／ｍｍ２ 以上、２．５２ｋｇｆ／ｍｍ２ 以下とするも
のである。このとき、引張り応力が０．０４３ｋｇｆ／
ｍｍ２ 未満では、加熱軟化部の温度を高めに設定する
必要があり、その分ガラスロッドの真直度が低くなる。
真直度を良くするため加熱軟化部の温度を下げると、延
伸速度が遅くなり生産性が下がり好ましくない。また、
２．５２ｋｇｆ／ｍｍ２ を超えると、ガラスロッドの
外径制御が困難となる。According to a second aspect of the present invention, there is provided a glass base material stretching apparatus having a heating furnace for heating and stretching a glass base material, a supply mechanism for supplying the glass base material, and a take-off mechanism. A pulling force detector is provided on both or one of the mechanism parts, and the tensile stress acting on the glass base material in the heat softening part of the glass base material is reduced to 0.043 kgf.
/ Mm 2 or more and 2.52 kgf / mm 2 or less. At this time, the tensile stress was 0.043 kgf /
If it is less than 2 mm, it is necessary to set the temperature of the heat-softened portion to be higher, and the straightness of the glass rod is reduced accordingly.
If the temperature of the heat-softened portion is lowered to improve straightness, the stretching speed is decreased, and productivity is undesirably reduced. Also,
If it exceeds 2.52 kgf / mm 2 , it becomes difficult to control the outer diameter of the glass rod.
【００１１】[0011]
【発明の実施の形態】本発明によるガラス母材延伸装置
の一実施例を図１に示す。大型ガラス母材１は、この上
端に設けられたダミーロッドを介してガラス母材供給機
構（図示を省略）で保持され、加熱炉２内に垂下され、
発熱体３により加熱軟化されてより細径のガラスロッド
４へと延伸される。延伸されたガラスロッド４の外径
は、加熱炉２の直下に配設された外径測定器５に測定さ
れ、管理される。FIG. 1 shows an embodiment of a glass base material stretching apparatus according to the present invention. The large glass base material 1 is held by a glass base material supply mechanism (not shown) via a dummy rod provided at the upper end, and is suspended in the heating furnace 2.
It is softened by heating by the heating element 3 and drawn into a glass rod 4 having a smaller diameter. The outer diameter of the drawn glass rod 4 is measured and managed by an outer diameter measuring device 5 disposed immediately below the heating furnace 2.
【００１２】加熱炉２の下方には引取り機構６が配設さ
れている。引取り機構６は、内部にガラスロッドを把持
する把持装置として把持チャック７、把持チャック８を
有し、ガラスロッドの把持は把持チャックの爪の開閉に
より行われる。さらに、引取り機構６は、引取り距離検
出器９および引取り力検出器１０を備えている。延伸さ
れたガラスロッド４は、把持チャック７もしくは把持チ
ャック８により把持されるとともに、ガラスロッド４に
引取り力が加えられ、所望の外径を有するガラスロッド
４へと延伸される。A take-off mechanism 6 is provided below the heating furnace 2. The take-off mechanism 6 has a holding chuck 7 and a holding chuck 8 as holding devices for holding the glass rod inside, and holding of the glass rod is performed by opening and closing claws of the holding chuck. Further, the take-off mechanism 6 includes a take-off distance detector 9 and a take-off force detector 10. The stretched glass rod 4 is gripped by the gripping chuck 7 or the gripping chuck 8, a pulling force is applied to the glass rod 4, and the glass rod 4 is stretched to the glass rod 4 having a desired outer diameter.
【００１３】ガラスロッド４の外径、引取り距離および
引取り力は、それぞれ外径測定器５、引取り距離検出器
９および引取り力検出器１０によって測定され、これら
の測定値信号は演算処理装置１１に入力され、加熱軟化
部１２で大型ガラス母材１に対して作用する引取り力が
計算される。引取り力検出器１０で測定される値は、加
熱軟化部１２で大型ガラス母材１に対して作用する引取
り力と加熱軟化部１２より下の延伸されたガラスロッド
４の自重の和である。従って、演算処理装置１１は、外
径測定器５、引取り距離検出器９および引取り力検出器
１０からの測定出力信号を得て、下記の（１）式によ
り、加熱軟化部１２での大型ガラス母材１に作用する引
取り力を算出する。The outer diameter, take-off distance and take-off force of the glass rod 4 are measured by an outer diameter measuring device 5, a take-off distance detector 9 and a take-off force detector 10, respectively. The drawing force input to the processing device 11 and acting on the large glass base material 1 in the heating softening unit 12 is calculated. The value measured by the pulling force detector 10 is the sum of the pulling force acting on the large glass base material 1 in the heating softening portion 12 and the own weight of the stretched glass rod 4 below the heating softening portion 12. is there. Therefore, the arithmetic processing unit 11 obtains measurement output signals from the outer diameter measuring device 5, the taking-off distance detector 9, and the taking-off force detector 10, and obtains the output signals from the heating softening unit 12 by the following equation (1). The take-off force acting on the large glass base material 1 is calculated.
【００１４】 Ｐ＝Ｆ−π／４・Ｄ２ ・Ｌ・ρ （１） Ｐ：加熱軟化部１２での大型ガラス母材１に作用する引
取り力 Ｆ：引取り力検出器１０の測定値 π：円周率 Ｄ：外径測定器５の測定値 Ｌ：引取り距離検出器９の測定値 ρ：密度（石英ガラスの場合、約２．２ｇ／ｃｍ３ ）P = F−π / 4 · D 2 · L · ρ (1) P: Take-off force acting on the large glass base material 1 in the heat softening part 12 F: Measured value of the take-off force detector 10 π: pi D: measured value of outer diameter measuring device 5 L: measured value of pick-up distance detector 9 ρ: density (in the case of quartz glass, about 2.2 g / cm 3 )
【００１５】なお、上記態様では、引取り力検出器１０
は、引取り機構６にのみ設けられているが、本発明はこ
れに限定されるものではなく、ガラス母材供給機構と引
取り機構６の両方に設けられていてもよい。さらに、引
取り機構６でのガラスロッド把持装置に把持チャック
７、８を採用しているが、図２に示すような引取りロー
ラ１３、１４を用いてガラスロッドを引取るようにして
もよい。In the above embodiment, the take-off force detector 10
Is provided only in the take-up mechanism 6, but the present invention is not limited to this, and may be provided in both the glass base material supply mechanism and the take-up mechanism 6. Further, although the grippers 7 and 8 are employed in the glass rod gripping device of the take-up mechanism 6, the glass rods may be taken up by using take-up rollers 13 and 14 as shown in FIG. .
【００１６】[0016]
【実施例１】本実施例においては、直胴部の外径１４０
ｍｍ、上端テーパー部の長さ４５０ｍｍ、直胴部の長さ
１２００ｍｍ、下端テーパー部の長さ４５０ｍｍで全長
２１００ｍｍの大型ガラス母材から外径５０ｍｍのガラ
スロッドに延伸した。先ず、この大型ガラス母材の両端
にそれぞれ上部ダミーロッド、下部ダミーロッドを取付
け、ガラス母材供給機構に上部ダミーロッド、引取り機
構の把持チャックに下部ダミーロッドがそれぞれ把持さ
れ、図１に示す延伸装置にセットし、ガラス母材を加熱
炉内に垂下して発熱体で加熱した。ガラス母材はガラス
の軟化点以上の温度で軟化して流動性を示すが、ガラス
母材はこの加熱軟化部において引取り力と自重により延
伸される。Embodiment 1 In this embodiment, the outer diameter 140 of the straight body is
The length of the upper end taper was 450 mm, the length of the straight body was 1200 mm, and the length of the lower end taper was 450 mm. First, an upper dummy rod and a lower dummy rod are attached to both ends of the large glass base material, respectively. The upper dummy rod is held by the glass base material supply mechanism, and the lower dummy rod is held by the holding chuck of the take-off mechanism, as shown in FIG. The glass base material was set in a stretching apparatus, and was suspended in a heating furnace and heated with a heating element. The glass preform softens at a temperature equal to or higher than the softening point of the glass and exhibits fluidity, but the glass preform is stretched by the take-off force and its own weight in the heat-softened portion.
【００１７】延伸されたガラスロッドの外径を外径測定
器５により測定し、さらに、引取り機構に設けられた引
取り距離検出器によりガラスロッドの引取り距離を、引
取り力検出器によりガラスロッドに作用する引取り力を
それぞれ測定し、これらの測定値（出力信号）は演算処
理装置で演算処理されて、引取り力検出器により測定さ
れた引取り力からガラスロッドの自重分を減算して加熱
軟化部での引取り力を求め、この引取り力が７〜８０ｋ
ｇになるように、加熱炉へのガラス母材の垂下速度、ガ
ラスロッドの引取り速度及び発熱体への出力をそれぞれ
制御して延伸した。このようにして得られたガラスロッ
ドは、真直度が高く残留歪みの少ないものであり、表面
に傷や微小な割れも認められず、かつ外径も５０±０．
５ｍｍと極めて外径変動の小さいものであった。The outer diameter of the stretched glass rod is measured by an outer diameter measuring device 5, and the take-off distance of the glass rod is determined by a take-off distance detector provided in the take-off mechanism. Each of the pulling forces acting on the glass rod is measured, and these measured values (output signals) are processed by an arithmetic processing unit, and the own weight of the glass rod is calculated from the pulling force measured by the pulling force detector. By subtracting, the take-off force at the heating softening portion is obtained, and this take-off force is 7 to 80 k.
The glass substrate was stretched such that the speed of dripping of the glass base material into the heating furnace, the speed of taking off the glass rod, and the output to the heating element were controlled so as to obtain g. The glass rod thus obtained has high straightness and little residual strain, has no scratches or minute cracks on the surface, and has an outer diameter of 50 ± 0.
The variation in outer diameter was extremely small at 5 mm.
【００１８】[0018]
【発明の効果】本発明のガラス母材延伸方法によれば、
大きな駆動装置を必要とせず、真直度が高く残留歪みの
少ないガラスロッドが得られ、また、表面に傷や微小な
割れを発生しないために火炎研磨工程を必要とせず、ガ
ラスロッド製造工程全体の生産性を上げることができ
た。According to the glass base material stretching method of the present invention,
A glass rod with high straightness and low residual distortion can be obtained without the need for a large driving device.Furthermore, no flame polishing process is required to prevent scratches and minute cracks on the surface. I was able to increase my productivity.
【図１】 本発明による延伸装置の一例を示す概略模式
図である。FIG. 1 is a schematic diagram showing an example of a stretching device according to the present invention.
【図２】 本発明による延伸装置の引取り機構の他の例
を示す概略模式図である。FIG. 2 is a schematic diagram showing another example of a take-off mechanism of the stretching device according to the present invention.
１ 大型ガラス母材 ２ 加熱炉 ３ 発熱体 ４ ガラスロッド ５ 外径測定器 ６ 引取り機構 ７ 把持チャック ８ 把持チャック ９ 引取り距離検出器 １０ 引取り力検出器 １１ 演算処理装置 １２ 加熱軟化部 １３ 引取りローラ １４ 引取りローラ DESCRIPTION OF SYMBOLS 1 Large-sized glass base material 2 Heating furnace 3 Heating element 4 Glass rod 5 Outer diameter measuring device 6 Pick-up mechanism 7 Holding chuck 8 Holding chuck 9 Pick-up distance detector 10 Pulling force detector 11 Arithmetic processing unit 12 Heat softening unit 13 Pickup roller 14 Pickup roller
───────────────────────────────────────────────────── フロントページの続き (72)発明者 山村 和市 群馬県安中市磯部２丁目13番１号 信越化 学工業株式会社精密機能材料研究所内 (72)発明者 平沢 秀夫 群馬県安中市磯部２丁目13番１号 信越化 学工業株式会社精密機能材料研究所内 Ｆターム(参考） 4G015 BA01 BB02 BB05 4G021 BA00 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Kazuichi Yamamura 2-13-1, Isobe, Annaka-shi, Gunma Shin-Etsu Kagaku Kogyo Co., Ltd. Precision Functional Materials Laboratory (72) Inventor Hideo Hirasawa Annaka-shi, Gunma 2-13-1, Isobe Shin-Etsu Kagaku Kogyo Co., Ltd. Precision Functional Materials Laboratory F-term (reference) 4G015 BA01 BB02 BB05 4G021 BA00
Claims (2)
を有するガラスロッドを得る方法であって、延伸された
ガラスロッドの外径、ガラスロッドの引取り距離および
ガラスロッドに作用する引取り力を検出し、ガラスロッ
ドの外径と引取り距離からガラスロッドの自重を算出
し、前記ガラスロッドに作用する引取り力からガラスロ
ッドの自重を減算して、ガラス母材に対する加熱軟化部
での引取り力を求め、加熱軟化部での該引取り力を７ｋ
ｇ以上、８０ｋｇ以下とすることを特徴とするガラス母
材延伸方法。1. A method of heating and stretching a glass base material to obtain a glass rod having a predetermined outer diameter, which acts on the outer diameter of the drawn glass rod, the take-up distance of the glass rod, and the glass rod. Detecting the pulling force, calculating the weight of the glass rod from the outer diameter and the pulling distance of the glass rod, subtracting the weight of the glass rod from the pulling force acting on the glass rod, and heating and softening the glass base material. The take-off force at the heat-softening part is determined by 7k.
g and 80 kg or less.
ラス母材を供給する供給機構及び引取り機構を有するガ
ラス母材延伸装置において、ガラス母材の供給機構部と
引取り機構部の両方又はいずれか一方に引取り力検出器
を配設し、ガラス母材の加熱軟化部においてガラス母材
に作用する引張り応力を０．０４３ｋｇｆ／ｍｍ２ 以
上、２．５２ｋｇｆ／ｍｍ２ 以下とすることを特徴と
するガラス母材延伸方法。2. A glass base material stretching apparatus having a heating furnace for heating and stretching the glass base material, a supply mechanism for supplying the glass base material, and a take-off mechanism, wherein both the glass base material supply mechanism and the take-off mechanism are provided. Alternatively, a take-off force detector is provided on one of the two , and the tensile stress acting on the glass base material in the heat-softened portion of the glass base material is set to 0.043 kgf / mm 2 or more and 2.52 kgf / mm 2 or less. A glass base material stretching method characterized by the above-mentioned.
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|---|---|---|---|
| JP11322699A JP3833003B2 (en) | 1999-04-21 | 1999-04-21 | Glass base material stretching method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11322699A JP3833003B2 (en) | 1999-04-21 | 1999-04-21 | Glass base material stretching method |
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| Publication Number | Publication Date |
|---|---|
| JP2000302470A true JP2000302470A (en) | 2000-10-31 |
| JP3833003B2 JP3833003B2 (en) | 2006-10-11 |
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| JP11322699A Expired - Fee Related JP3833003B2 (en) | 1999-04-21 | 1999-04-21 | Glass base material stretching method |
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Cited By (4)
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| JP2015163572A (en) * | 2014-01-31 | 2015-09-10 | 信越化学工業株式会社 | Processing method and processing device for glass rod |
| KR20170070014A (en) * | 2014-10-14 | 2017-06-21 | 헤래우스 테네보 엘엘씨 | Apparatus and method for preform or tube drawing based on its viscosity |
| JP2021001903A (en) * | 2020-09-18 | 2021-01-07 | ヘレーウス クオーツ ノース アメリカ エルエルシーＨｅｒａｅｕｓ Ｑｕａｒｔｚ Ｎｏｒｔｈ Ａｍｅｒｉｃａ ＬＬＣ | Apparatus and method for preform or tube drawing based on its viscosity |
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1999
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013159549A (en) * | 2012-02-09 | 2013-08-19 | Shin-Etsu Chemical Co Ltd | Method of drawing optical fiber perform |
| JP2015163572A (en) * | 2014-01-31 | 2015-09-10 | 信越化学工業株式会社 | Processing method and processing device for glass rod |
| US10106451B2 (en) | 2014-01-31 | 2018-10-23 | Shin-Etsu Chemical Co., Ltd. | Glass rod machining method and machining apparatus |
| KR20170070014A (en) * | 2014-10-14 | 2017-06-21 | 헤래우스 테네보 엘엘씨 | Apparatus and method for preform or tube drawing based on its viscosity |
| JP2017532556A (en) * | 2014-10-14 | 2017-11-02 | ヘレーウス テネーヴォ エルエルシーＨｅｒａｅｕｓ Ｔｅｎｅｖｏ Ｌｌｃ | Equipment and method for drawing a base material or tube based on its viscosity |
| KR102365314B1 (en) * | 2014-10-14 | 2022-02-22 | 헤래우스 쿼츠 노쓰 아메리카 엘엘씨 | Apparatus and method for preform or tube drawing based on its viscosity |
| US11454580B2 (en) | 2014-10-14 | 2022-09-27 | Heraeus Quartz North America Llc | Method for preform or tube drawing based on its viscosity |
| JP2021001903A (en) * | 2020-09-18 | 2021-01-07 | ヘレーウス クオーツ ノース アメリカ エルエルシーＨｅｒａｅｕｓ Ｑｕａｒｔｚ Ｎｏｒｔｈ Ａｍｅｒｉｃａ ＬＬＣ | Apparatus and method for preform or tube drawing based on its viscosity |
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