JP3071420B1 - Method and apparatus for stretching glass base material - Google Patents

Method and apparatus for stretching glass base material

Info

Publication number
JP3071420B1
JP3071420B1 JP11046141A JP4614199A JP3071420B1 JP 3071420 B1 JP3071420 B1 JP 3071420B1 JP 11046141 A JP11046141 A JP 11046141A JP 4614199 A JP4614199 A JP 4614199A JP 3071420 B1 JP3071420 B1 JP 3071420B1
Authority
JP
Japan
Prior art keywords
base material
glass base
center position
stretching
outer diameter
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
Application number
JP11046141A
Other languages
Japanese (ja)
Other versions
JP2000247664A (en
Inventor
和市 山村
光邦 坂下
忠克 島田
秀夫 平沢
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.)
Shin Etsu Chemical Co Ltd
Original Assignee
Shin Etsu Chemical 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 Shin Etsu Chemical Co Ltd filed Critical Shin Etsu Chemical Co Ltd
Priority to JP11046141A priority Critical patent/JP3071420B1/en
Priority to DE69924447T priority patent/DE69924447T2/en
Priority to DE1999638158 priority patent/DE69938158T8/en
Priority to EP03090253A priority patent/EP1364919B1/en
Priority to EP03090252A priority patent/EP1364918B1/en
Priority to EP99250390A priority patent/EP0999189B1/en
Priority to DE69931825T priority patent/DE69931825T8/en
Priority to KR1019990048941A priority patent/KR100551100B1/en
Priority to US09/434,280 priority patent/US6386001B1/en
Application granted granted Critical
Publication of JP3071420B1 publication Critical patent/JP3071420B1/en
Publication of JP2000247664A publication Critical patent/JP2000247664A/en
Priority to US10/158,804 priority patent/US20020152772A1/en
Priority to US10/158,843 priority patent/US20020139149A1/en
Priority to US10/158,803 priority patent/US20020144520A1/en
Priority to US10/158,904 priority patent/US6779362B2/en
Priority to US10/158,801 priority patent/US6848276B2/en
Priority to US11/046,889 priority patent/US20050132753A1/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00—Technologies relating to the processing of minerals
    • Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
    • Y02P40/57—Improving the yield, e-g- reduction of reject rates

Landscapes

  • Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)
  • Manufacture, Treatment Of Glass Fibers (AREA)

Abstract

【要約】 【課題】 ガラス母材を延伸して曲がりの少ないガラス
ロッドとするガラス母材の延伸方法および延伸装置を提
供する。 【解決手段】 本発明のガラス母材の延伸方法は、延伸
装置の上部にガラス母材１を吊り下げて加熱軟化し、延
伸したガラス母材１を、延伸装置の下方に設置した少な
くとも一対のローラー４で挟持して引き取るに際し、ガ
ラス母材１の加熱軟化部の中心位置と延伸装置の延伸軸
線との偏差量にもとづき、該ローラー４の左右の回転数
を個別に制御することを特徴とし、これに用いる延伸装
置は、上部にガラス母材１を吊り下げ所定の速度で加熱
炉へ送るための供給機構と、加熱炉内にガラス母材１を
加熱軟化させる加熱部と、下部に少なくとも一対のロー
ラー４で挟持してこれを引き取る引き取り機構とを有す
る延伸装置において、ガラス母材１の加熱軟化部の中心
位置を測定する中心位置測定器５と、測定された中心位
置と延伸装置の延伸軸線６との偏差量にもとづき該ロー
ラー４の左右の回転数を個別に制御する制御装置とを備
えている。The present invention provides a method and an apparatus for stretching a glass base material by drawing the glass base material into a glass rod with less bending. SOLUTION: In the method for stretching a glass base material of the present invention, a glass base material 1 is suspended and softened by heating on an upper part of a drawing device, and the drawn glass base material 1 is provided at least in a pair under a drawing device. When nipping and drawing by the roller 4, the number of rotations of the right and left of the roller 4 is individually controlled based on a deviation amount between a center position of the heat-softening portion of the glass base material 1 and a drawing axis of the drawing device. The stretching apparatus used for this, a supply mechanism for suspending the glass base material 1 at the upper part and sending it to the heating furnace at a predetermined speed, a heating unit for heating and softening the glass base material 1 in the heating furnace, and at least a lower part at the lower part In a stretching apparatus having a take-off mechanism for nipping and drawing the pair of rollers 4, a center position measuring device 5 for measuring a center position of a heat-softened portion of the glass base material 1, Stretching A control device for individually controlling the left and right rotational speeds of the roller 4 based on the deviation amount from the axis 6 is provided.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【発明の属する技術分野】本発明は、ガラス化された光
ファイバ母材インゴット（以下、ガラス母材という）を
延伸してより細径の光ファイバガラスロッド（以下、ガ
ラスロッドという）を製造する際、ガラスロッドの曲が
りを抑制するガラス母材の延伸方法および延伸装置に関
する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a glass fiber rod (hereinafter, referred to as a glass rod) having a smaller diameter by drawing a vitrified optical fiber preform ingot (hereinafter, referred to as a glass base material). In this regard, the present invention relates to a method and an apparatus for stretching a glass base material for suppressing bending of a glass rod.

【０００２】[0002]

【従来の技術】従来、多孔質体である母材インゴットを
透明ガラス化してガラス母材とし、これを延伸して線引
きに適したより細径のガラスロッドが製造されている。
このガラス母材を、所定の径を有するガラスロッドに延
伸するには、ガラス母材を延伸装置にセットしてバーナ
ーによる酸水素火炎もしくは電気炉で加熱・軟化させ、
ガラス母材の加熱軟化部の外径を外径測定器などを用い
て測定し、この測定値にもとづいて引き取り速度を制御
し延伸していた。2. Description of the Related Art Heretofore, a base material ingot as a porous body has been made into a glass base material by vitrifying it into a glass base material, which is stretched to produce a thinner glass rod suitable for drawing.
In order to stretch this glass base material into a glass rod having a predetermined diameter, the glass base material is set in a stretching device and heated and softened in an oxyhydrogen flame by a burner or an electric furnace,
The outer diameter of the heat-softened portion of the glass base material was measured using an outer diameter measuring device or the like, and the drawing speed was controlled based on the measured value to perform stretching.

【０００３】母材インゴットを透明ガラス化する際、母
材インゴットの加熱条件や多孔質体の密度分布の偏り等
により、母材インゴットの円周方向によって収縮の度合
いにばらつきが生じると、透明ガラス化されたガラス母
材に曲がりを生じることがあった。[0003] When a base material ingot is made into a transparent glass, if the degree of shrinkage varies in the circumferential direction of the base material ingot due to heating conditions of the base material ingot, deviation of the density distribution of the porous body, or the like, the transparent glass becomes invisible. In some cases, the formed glass base material was bent.

【０００４】[0004]

【発明が解決しようとする課題】延伸装置にガラス母材
をセットするための把持用ダミー棒が、軸線からずれて
溶着されていたり、あるいは曲がったガラス母材を使用
して延伸すると、把持用ダミー棒の軸ずれの影響を受け
てガラスロッドに曲がりを生じる。また、延伸されたガ
ラスロッドは、炉の下方でピンチローラーにより挟持さ
れ、引き取られる。ピンチローラーは、ガラス表面に傷
を付けないように、耐熱性と柔軟性を有するノンアスベ
ストやアスベスト等で形成されているが、これは粉体を
成形したものであるため、ガラスロッドとの接触面は、
ガラスロッドの高温とピンチ（挟持）力や摩擦力により
次第に変形する。このため、左右のローラーでガラスロ
ッドとの接触面積に差を生じ、周速が異なることとな
り、回転数が一定であっても、左右のローラーでガラス
ロッドの引き取り速度に差を生じ、ガラス母材の加熱軟
化部の位置が変動する結果、ガラスロッドに曲がりを生
じる。When a holding dummy rod for setting a glass base material in a drawing device is welded off-axis or stretched using a bent glass base material, the holding dummy rod is pulled out. The glass rod is bent under the influence of the misalignment of the dummy rod. The stretched glass rod is pinched and pinched by a pinch roller below the furnace. The pinch roller is made of heat-resistant and flexible non-asbestos, asbestos, etc., so as not to scratch the glass surface. The surface is
Deforms gradually due to the high temperature of the glass rod, pinch (pinching) force and frictional force. For this reason, a difference occurs in the contact area between the right and left rollers and the glass rod, resulting in a difference in peripheral speed. Even if the rotation speed is constant, a difference occurs in the take-up speed of the glass rod between the left and right rollers, and As a result of the change in the position of the heat-softened portion of the material, the glass rod bends.

【０００５】曲がったガラスロッドを用いて線引きする
と、作業性が悪く、しかも安定した光ファイバ特性が得
られない。本発明は、上記事情に鑑みてなされたもので
あり、ガラス母材を延伸して曲がりの少ないガラスロッ
ドとするガラス母材の延伸方法および延伸装置を提供す
ることを目的としている。When a wire is drawn using a bent glass rod, workability is poor and stable optical fiber characteristics cannot be obtained. The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a method and apparatus for stretching a glass base material by drawing the glass base material into a glass rod with less bending.

【０００６】[0006]

【課題を解決するための手段】本発明のガラス母材の延
伸方法は、延伸装置の上部にガラス母材を吊り下げて加
熱軟化し、延伸したガラス母材を、延伸装置の下方に設
置した少なくとも一対のローラーで挟持して引き取るに
際し、ガラス母材の加熱軟化部の中心位置と延伸装置の
延伸軸線との偏差量にもとづき、該ローラーの左右の回
転数を個別に制御することを特徴としている。前記一対
のローラーの回転数を制御するに際し、ガラス母材の加
熱軟化部で測定された外径値情報を外径制御演算回路に
導き、設定値と比較演算して左右いずれか一方のローラ
ーの回転数を制御し、他方のローラーの回転数は、測定
した加熱軟化部の中心位置情報を位置制御演算回路に導
き、装置の延伸軸線からの偏差量が一定になるような補
正値を求め、この補正値に前記外径制御演算回路からの
外径値制御情報を加えて制御される。According to the method for stretching a glass base material of the present invention, a glass base material is suspended and softened by heating above a drawing device, and the drawn glass base material is placed below the drawing device. When nipping and drawing by at least a pair of rollers, based on the deviation amount between the center position of the heat-softening portion of the glass base material and the drawing axis of the drawing device, the number of rotations of the right and left of the rollers is individually controlled, I have. When controlling the number of rotations of the pair of rollers, the outer diameter value information measured in the heating and softening portion of the glass base material is guided to the outer diameter control arithmetic circuit, and the calculated value is compared with the set value to calculate the one of the left and right rollers. Control the number of rotations, the number of rotations of the other roller, the center position information of the measured heating softening part is guided to the position control arithmetic circuit, to determine a correction value such that the amount of deviation from the stretching axis of the device is constant, Control is performed by adding outer diameter value control information from the outer diameter control arithmetic circuit to this correction value.

【０００７】さらに、本発明のガラス母材の延伸装置
は、上部にガラス母材を吊り下げ所定の速度で加熱炉へ
送るための供給機構と、加熱炉内にガラス母材を加熱軟
化させる加熱部と、下部に少なくとも一対のローラーで
挟持してこれを引き取る引き取り機構とを有する延伸装
置において、ガラス母材の加熱軟化部の中心位置を測定
する中心位置測定器と、測定された中心位置と延伸装置
の延伸軸線との偏差量にもとづき該ローラーの左右の回
転数を個別に制御する制御装置とを備えている。なお、
上記中心位置測定器とは、加熱軟化部の中心位置が測定
もしくは演算して得られる機器を意味し、例えば、測定
した外径値を演算処理して加熱軟化部の中心位置を求め
る演算処理機能を内蔵もしくは周辺に備えた外径測定器
が挙げられる。Further, the apparatus for stretching a glass base material of the present invention comprises a supply mechanism for suspending the glass base material at an upper portion and feeding the glass base material at a predetermined speed to the heating furnace, and a heating mechanism for heating and softening the glass base material in the heating furnace. Part, in a stretching device having a take-off mechanism for nipping at least a pair of rollers at the bottom and pulling it, a center position measuring device that measures the center position of the heat-softened portion of the glass base material, and the measured center position. A control device for individually controlling the left and right rotation speeds of the roller based on the deviation from the stretching axis of the stretching device. In addition,
The center position measuring device means a device obtained by measuring or calculating the center position of the heating softening unit. For example, an arithmetic processing function for calculating the measured outer diameter value to obtain the center position of the heating softening unit. An outer diameter measuring device having a built-in or peripheral.

【０００８】ガラス母材の延伸は、通常、縦型の延伸装
置を用いて行われているが、種々の要因によりガラスロ
ッドに曲がりを生じている。このような場合において
も、ガラス母材の加熱軟化部の中心位置と延伸装置の延
伸軸線との偏差量にもとづき、左右のローラー表面の周
速が等しくなるように左右のローラーの回転数を個別に
制御することで、ガラス母材の加熱軟化部の中心位置を
一定に保持した状態でガラス母材を延伸することができ
る。[0008] The glass base material is usually drawn using a vertical drawing device, but the glass rod is bent due to various factors. Even in such a case, the rotational speeds of the left and right rollers are individually adjusted so that the peripheral speeds of the left and right roller surfaces are equal based on the deviation amount between the center position of the heat softening portion of the glass base material and the drawing axis of the drawing device. , The glass base material can be stretched while keeping the center position of the heat-softened portion of the glass base material constant.

【０００９】[0009]

【発明の実施の形態】ガラス母材の延伸について鋭意調
査した結果、図２に示すように、ガラス母材の加熱軟化
部の中心位置に対する延伸軸線からの偏差量すなわち軸
ずれ量と、ガラスロッドの曲がりとの間には相関関係が
認められた。このとき、ローラー表面の耐熱部材は変形
し、形状は左右で微妙に異なっていた。このことはロー
ラー表面の周速が左右で異なることを示している。この
結果、ローラー表面の変形がガラスロッドの曲がりの一
因となっていることを見出し、ローラーの左右の回転数
を個別に制御することによりガラスロッドの曲がりを抑
制する方法を見出したものである。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As a result of intensive studies on the elongation of a glass base material, as shown in FIG. 2, the deviation amount from the center axis of the heat-softened portion of the glass base material, that is, the axial deviation amount, and the glass rod There was a correlation between the curve and the curve. At this time, the heat-resistant member on the roller surface was deformed, and the shape was slightly different between the left and right. This indicates that the peripheral speed of the roller surface is different between left and right. As a result, the present inventors have found that the deformation of the roller surface contributes to the bending of the glass rod, and have found a method of suppressing the bending of the glass rod by individually controlling the number of rotations of the right and left rollers. .

【００１０】ローラーの表面は、高温のガラスロッドを
引き取り易いように、耐熱性と柔軟性を有するノンアス
ベストやアスベスト等からなる耐熱部材で形成されてい
る。このため、ガラスロッドと接触するローラーの表面
は、ガラスロッドの高温とピンチ力や摩擦力により次第
に変形し、変形状態は左右のローラーで微妙に異なり、
ローラー表面の周速が左右で異なることとなる。図３は
ローラー表面の変形を示し、左ローラー（ａ）と右ロー
ラー（ｂ）とではその外周形状が極めて相違している。
なお、図中のバッチ数はガラス母材の延伸回数である。
バッチ数が増すにつれて、変形と摩耗の進行が認められ
る。このため、ローラーの左右でガラスロッドの引き取
り量に差を生じ、ガラス母材の加熱軟化部の位置が変動
する結果、ガラスロッドに曲がりを生じる。[0010] The surface of the roller is formed of a heat-resistant member made of non-asbestos, asbestos, or the like having heat resistance and flexibility so as to easily take up a high-temperature glass rod. For this reason, the surface of the roller in contact with the glass rod is gradually deformed by the high temperature of the glass rod and the pinch force or frictional force, and the deformation state is slightly different between the left and right rollers,
The peripheral speed of the roller surface differs between left and right. FIG. 3 shows the deformation of the roller surface, and the outer shapes of the left roller (a) and the right roller (b) are extremely different.
The number of batches in the figure is the number of times the glass base material is stretched.
As the number of batches increases, deformation and wear progress are observed. For this reason, there is a difference in the amount of the glass rod taken off between the right and left sides of the roller, and the position of the heat softening portion of the glass base material fluctuates.

【００１１】この現象を明らかにするため、図３に示し
たバッチ数３００のローラーを用いて金属パイプの引き
取りテストを行ったところ、図４に示す結果が得られ
た。ローラーの回転方向への偏差量の変動を示す曲線Ａ
は、ローラーが１回転する間に大きく変動していること
を示している。これに対して、曲線Ｂは、ローラーの前
後方向（図面の奥行き方向）への変動は極めて小さいこ
とを示している。To clarify this phenomenon, a take-up test of a metal pipe was carried out using a roller having 300 batches as shown in FIG. 3, and the result shown in FIG. 4 was obtained. Curve A showing the variation of the deviation amount in the rotation direction of the roller
Indicates that the roller fluctuates greatly during one rotation. On the other hand, the curve B indicates that the fluctuation of the roller in the front-rear direction (the depth direction of the drawing) is extremely small.

【００１２】[0012]

【実施例】（実施例１）本発明のガラス母材の延伸方法
を、図１の制御系原理図を用いて説明する。ガラス母材
１は、延伸装置の吊り下げ部２に吊り下げられ、供給機
構により所定の速度で加熱炉へ送られる。加熱炉（図示
を省略）で加熱・軟化されて延伸され、細径化されたガ
ラスロッド３は、少なくとも一対の左右のピンチローラ
ー４ａ、４ｂからなる引き取り機構により引き取られ
る。ガラス母材の加熱軟化部の中心位置は、外径測定器
５によりガラス母材の加熱軟化部の外径値を測定し、同
時にこの外径値を演算処理して求められ、さらに、装置
の延伸軸線６との偏差量（図の左右方向）が求められ
る。外径測定器５はレーザー光透過型が好ましく用いら
れる。レーザー光は、加熱炉のヒーター下部に設けた窓
から加熱軟化部に向けて照射される。(Embodiment 1) A method of stretching a glass base material according to the present invention will be described with reference to a principle diagram of a control system shown in FIG. The glass preform 1 is suspended by the suspension unit 2 of the stretching device, and sent to the heating furnace at a predetermined speed by a supply mechanism. The glass rod 3 which has been heated, softened, stretched and reduced in diameter in a heating furnace (not shown) is drawn by a pulling mechanism including at least a pair of left and right pinch rollers 4a and 4b. The center position of the heat-softening portion of the glass base material is obtained by measuring the outer diameter value of the heat-softening portion of the glass base material by the outer diameter measuring device 5 and simultaneously calculating and processing this outer diameter value. The amount of deviation from the stretching axis 6 (the left-right direction in the figure) is determined. As the outer diameter measuring device 5, a laser light transmission type is preferably used. The laser light is emitted from a window provided below the heater of the heating furnace toward the heating softening portion.

【００１３】測定された外径値情報は外径制御演算回路
に導かれ、設定値と比較演算されてピンチローラー４ａ
の回転数が制御される。他方、加熱軟化部の中心位置情
報は位置制御演算回路に導かれ、延伸軸線６からの偏差
量が一定になるような補正値を求め、この補正値に外径
制御演算回路からの外径値制御情報を加えてピンチロー
ラー４ｂの回転数が設定され制御される。本実施例にも
とづく加熱軟化部の中心位置制御の様子を図５に示す。
このように左右のローラーの回転数を個別に制御するこ
とにより、加熱軟化部の中心位置は一定に保持され、実
質的に曲がりのないガラスロッドが製造される。The measured outer diameter value information is led to an outer diameter control arithmetic circuit, where the information is compared with a set value and calculated.
Is controlled. On the other hand, the center position information of the heat-softening section is guided to a position control arithmetic circuit, and a correction value for keeping the deviation amount from the stretching axis 6 constant is obtained. The number of rotations of the pinch roller 4b is set and controlled by adding the control information. FIG. 5 shows how the center position of the heating softening portion is controlled based on the present embodiment.
By individually controlling the rotation speeds of the left and right rollers as described above, the center position of the heat softening portion is kept constant, and a glass rod having substantially no bending is manufactured.

【００１４】（比較例１）実施例１と同様の外径測定器
を用いてガラス母材の加熱軟化部での外径値を測定し、
左右のローラーを同回転数で制御して、所定の径を有す
るガラスロッドを製造した。この比較例にもとづく加熱
軟化部の中心位置変動の様子を図６に示す。このように
左右のローラーの回転数を同一とする従来の方法による
引き取りでは、加熱軟化部の中心位置の変動が大きく、
延伸されたガラスロッドにも修正を必要とするほどの曲
がりを生じた。(Comparative Example 1) Using the same outer diameter measuring device as in Example 1, the outer diameter value of the glass base material in the heat-softened portion was measured.
By controlling the left and right rollers at the same rotation speed, a glass rod having a predetermined diameter was manufactured. FIG. 6 shows how the center position of the heat-softened portion changes based on this comparative example. As described above, in the take-off by the conventional method in which the rotation speeds of the left and right rollers are the same, the fluctuation of the center position of the heating softening portion is large,
The drawn glass rod also bends to a degree that requires correction.

【００１５】[0015]

【発明の効果】本発明により、ピンチローラーの表面が
ピンチ力や熱の影響により変形しても、ガラス母材の加
熱軟化部の中心位置を常に一定にすることによりガラス
母材の変動が極めて少なくなり、結果としてガラスロッ
ドの曲がりが抑制された。また、従来、ローラー表面の
変形が確認されると、ローラーを交換していたが、本発
明の延伸方法を採用することで表面の変形を理由とする
交換の必要がなくなり、設備稼働率が上昇し、生産性が
向上した。According to the present invention, even if the surface of the pinch roller is deformed by the effect of pinch force or heat, the center position of the heat-softened portion of the glass base material is always kept constant, so that the fluctuation of the glass base material is extremely small. As a result, the bending of the glass rod was suppressed. In addition, conventionally, when deformation of the roller surface was confirmed, the roller was replaced.However, adoption of the stretching method of the present invention eliminates the need for replacement due to surface deformation and increases the equipment operation rate. And increased productivity.

【図面の簡単な説明】[Brief description of the drawings]

【図１】 本発明のガラス母材の延伸方法を説明する制
御系原理図である。FIG. 1 is a principle diagram of a control system for explaining a method for stretching a glass base material of the present invention.

【図２】 加熱軟化部の中心位置の偏心量とガラスロッ
ドの曲がりとの関係を示す図である。FIG. 2 is a diagram showing the relationship between the amount of eccentricity of the center position of a heating softening portion and the bending of a glass rod.

【図３】 使用回数によるローラーの外周形状の変化を
示し、（ａ）は左ローラーを、（ｂ）は右ローラーを示
す図である。3A and 3B show changes in the outer peripheral shape of a roller according to the number of times of use, where FIG. 3A shows a left roller and FIG. 3B shows a right roller.

【図４】 ローラーの回転方向に平行な方向と、これと
直角に交わる方向での加熱軟化部の中心位置の変化を示
す図である。FIG. 4 is a diagram showing a change in the center position of the heat softening portion in a direction parallel to the rotation direction of the roller and in a direction perpendicular to the direction of rotation of the roller.

【図５】 本発明の加熱軟化部の中心位置の経時変化を
示す図である。FIG. 5 is a diagram showing a temporal change of a center position of a heat-softening portion according to the present invention.

【図６】 従来例の加熱軟化部の中心位置の経時変化を
示す図である。FIG. 6 is a diagram showing a temporal change of a center position of a heat-softening portion of a conventional example.

【符号の説明】[Explanation of symbols]

１・・・ガラス母材 ２・・・吊り下げ部 ３・・・ガラスロッド ４・・・ピンチローラー ４ａ・・左ローラー ４ｂ・・右ローラー ５・・・外径測定器 ６・・・延伸軸線 DESCRIPTION OF SYMBOLS 1 ... Glass base material 2 ... Hanging part 3 ... Glass rod 4 ... Pinch roller 4a ... Left roller 4b ... Right roller 5 ... Outer diameter measuring device 6 ... Stretching axis

───────────────────────────────────────────────────── フロントページの続き (72)発明者 島田 忠克 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 (56)参考文献 特開 平10−158024（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) C03B 23/00 - 23/26 C03B 37/012 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tadakatsu Shimada 2-3-1-1, Isobe, Annaka-shi, Gunma Shin-Etsu Chemical Co., Ltd.Precision Functional Materials Laboratory (72) Inventor Hideo Hirasawa Isobe, Annaka-shi, Gunma 2-13-1 Shin-Etsu Chemical Co., Ltd. Precision Functional Materials Laboratory (56) References JP-A-10-158024 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB name) C03B 23/00-23/26 C03B 37/012

Claims (4)

(57)【特許請求の範囲】(57) [Claims] 【請求項１】 延伸装置の上部にガラス母材を吊り下げ
て加熱軟化し、延伸したガラス母材を、延伸装置の下方
に設置した少なくとも一対のローラーで挟持して引き取
るに際し、ガラス母材の加熱軟化部の中心位置と延伸装
置の延伸軸線との偏差量にもとづき、該ローラーの左右
の回転数を個別に制御することを特徴とするガラス母材
の延伸方法。1. A glass base material is suspended and heated and softened by suspending the glass base material on an upper part of a drawing device. When the drawn glass base material is held by at least a pair of rollers provided below the drawing device and taken off, the glass base material is removed. A method for drawing a glass base material, wherein the number of rotations of the right and left sides of the roller is individually controlled based on a deviation amount between a center position of the heat softening portion and a drawing axis of a drawing device. 【請求項２】 前記一対のローラーの回転数を制御する
に際し、ガラス母材の加熱軟化部で測定された外径値情
報を外径制御演算回路に導き、設定値と比較演算して左
右いずれか一方のローラーの回転数を制御し、他方のロ
ーラーの回転数が、測定した加熱軟化部の中心位置情報
を位置制御演算回路に導き、装置の延伸軸線からの偏差
量が一定になるような補正値を求め、この補正値に前記
外径制御演算回路からの外径値制御情報を加えて制御さ
れる請求項１に記載のガラス母材の延伸方法。2. When controlling the rotation speed of the pair of rollers, the outer diameter value information measured by the heating and softening portion of the glass base material is guided to an outer diameter control arithmetic circuit, and the calculated value is compared with a set value to calculate the right or left. The number of rotations of one of the rollers is controlled, and the number of rotations of the other roller guides the measured center position information of the heat-softening part to the position control arithmetic circuit so that the deviation amount from the stretching axis of the device becomes constant. The method for stretching a glass base material according to claim 1, wherein a correction value is obtained, and the correction is performed by adding outer diameter value control information from the outer diameter control arithmetic circuit to the correction value. 【請求項３】 上部にガラス母材を吊り下げ所定の速度
で加熱炉へ送るための供給機構と、加熱炉内にガラス母
材を加熱軟化させる加熱部と、下部に少なくとも一対の
ローラーで挟持してこれを引き取る引き取り機構とを有
する延伸装置において、ガラス母材の加熱軟化部の中心
位置を測定する中心位置測定器と、測定された中心位置
と延伸装置の延伸軸線との偏差量にもとづき該ローラー
の左右の回転数を個別に制御する制御装置とを備えてい
ることを特徴とするガラス母材の延伸装置。3. A supply mechanism for suspending a glass base material at an upper portion and feeding the glass base material at a predetermined speed, a heating section for heating and softening the glass base material in the heating furnace, and a lower portion sandwiched by at least one pair of rollers. In a stretching apparatus having a take-off mechanism for taking out the material, a center position measuring device for measuring a center position of the heat-softened portion of the glass base material, and a deviation amount between the measured center position and a stretching axis of the stretching apparatus. A controller for individually controlling the number of rotations of the right and left rollers. 【請求項４】 前記中心位置測定器が、測定した外径値
を演算処理して加熱軟化部の中心位置を求める演算処理
機能を内蔵もしくは周辺に備えた外径測定器である請求
項３に記載のガラス母材の延伸装置。4. The outer diameter measuring device according to claim 3, wherein the center position measuring device has a built-in or peripheral processing function for calculating a center position of the heating softening portion by performing arithmetic processing on the measured outer diameter value. An apparatus for stretching a glass base material as described above.
JP11046141A 1998-11-05 1999-02-24 Method and apparatus for stretching glass base material Expired - Fee Related JP3071420B1 (en)

Priority Applications (15)

Application Number Priority Date Filing Date Title
JP11046141A JP3071420B1 (en) 1999-02-24 1999-02-24 Method and apparatus for stretching glass base material
DE1999638158 DE69938158T8 (en) 1998-11-05 1999-11-03 A method of making a preform and an optical fiber from the preform
EP03090253A EP1364919B1 (en) 1998-11-05 1999-11-03 Method for manufacturing a preform and optical fibre from the preform
EP03090252A EP1364918B1 (en) 1998-11-05 1999-11-03 A method and apparatus for manufacturing a preform and optical fibre from the preform
EP99250390A EP0999189B1 (en) 1998-11-05 1999-11-03 Process and apparatus for drawing a preform and for drawing an optical fibre from the drawn preform
DE69931825T DE69931825T8 (en) 1998-11-05 1999-11-03 Method and apparatus for producing a preform and an optical fiber from the preform
DE69924447T DE69924447T2 (en) 1998-11-05 1999-11-03 A method and apparatus for drawing a preform and drawing an optical fiber from the drawn preform
US09/434,280 US6386001B1 (en) 1998-11-05 1999-11-05 Optical fiber manufacture method including elongating a preform in a vertical direction and a horizontal direction
KR1019990048941A KR100551100B1 (en) 1998-11-05 1999-11-05 Optical fiber manufacture method, preform manufacture method, and preform manufacture apparatus
US10/158,804 US20020152772A1 (en) 1998-11-05 2002-06-03 Optical fiber manufacture method, preform manufacture method, and preform manufacture apparatus
US10/158,843 US20020139149A1 (en) 1998-11-05 2002-06-03 Optical fiber manufacture method, preform manufacture method, and preform manufacture apparatus
US10/158,803 US20020144520A1 (en) 1998-11-05 2002-06-03 Optical fiber manufacture method, preform manufacture method, and preform manufacture apparatus
US10/158,904 US6779362B2 (en) 1998-11-05 2002-06-03 Method of making an optical fiber preform where a second elongation is based on a mark on a glass rod
US10/158,801 US6848276B2 (en) 1998-11-05 2002-06-03 Optical fiber manufacture method, preform manufacture method, and preform manufacture apparatus
US11/046,889 US20050132753A1 (en) 1998-11-05 2005-02-01 Optical fiber manufacture method, preform manufacture method, and preform manufacture apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11046141A JP3071420B1 (en) 1999-02-24 1999-02-24 Method and apparatus for stretching glass base material

Publications (2)

Publication Number Publication Date
JP3071420B1 true JP3071420B1 (en) 2000-07-31
JP2000247664A JP2000247664A (en) 2000-09-12

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ID=12738706

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Application Number Title Priority Date Filing Date
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Country Link
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CN113754257A (en) * 2020-06-04 2021-12-07 格雷斯海姆里根斯堡有限公司 Method and apparatus for making glassware

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JP4471857B2 (en) * 2005-01-28 2010-06-02 信越化学工業株式会社 Pinch roller for glass base material stretching
JP4737710B2 (en) * 2005-03-16 2011-08-03 日産自動車株式会社 Fine recess processing apparatus and fine recess processing method
DE102012107338B4 (en) * 2012-08-09 2015-06-18 Schott Ag Method for forming an elongated glass body
CN109761485B (en) * 2019-01-28 2020-09-01 东北大学 Device and method for preparing tapered and/or spiral core soft glass optical fiber
CN110395894B (en) * 2019-08-01 2020-04-21 重庆盛泰光电有限公司 Machining device for elliptical ring-shaped optical glass

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Publication number Priority date Publication date Assignee Title
CN113754257A (en) * 2020-06-04 2021-12-07 格雷斯海姆里根斯堡有限公司 Method and apparatus for making glassware
CN113754257B (en) * 2020-06-04 2023-05-26 格雷斯海姆里根斯堡有限公司 Method and apparatus for manufacturing glassware

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