JP2009132586A - Drawing method for glass preform - Google Patents

Drawing method for glass preform Download PDF

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JP2009132586A
JP2009132586A JP2007311636A JP2007311636A JP2009132586A JP 2009132586 A JP2009132586 A JP 2009132586A JP 2007311636 A JP2007311636 A JP 2007311636A JP 2007311636 A JP2007311636 A JP 2007311636A JP 2009132586 A JP2009132586 A JP 2009132586A
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base material
glass base
fitting
dummy
heat shield
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Kiichiro Kawasaki
希一郎 川崎
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Sumitomo Electric Industries Ltd
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Sumitomo Electric Industries Ltd
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Priority to JP2007311636A priority Critical patent/JP2009132586A/en
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    • 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
    • C03B37/014—Manufacture of preforms for drawing fibres or filaments made entirely or partially by chemical means, e.g. vapour phase deposition of bulk porous glass either by outside vapour deposition [OVD], or by outside vapour phase oxidation [OVPO] or by vapour axial deposition [VAD]
    • C03B37/01486—Means for supporting, rotating or translating the preforms being formed, e.g. lathes

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General 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)
  • Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)
  • Manufacture, Treatment Of Glass Fibers (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drawing method for a glass preform which can repeatedly use fitting members supporting dummy rods connected to a glass preform. <P>SOLUTION: Regarding the drawing method for a glass preform where dummy rods 21 connected to both the sides of a glass preform 20 are fitted with fitting members 22, respectively, so as to be connected, the fitting members 22 are grasped by chucks 23, respectively, and, while heating and softening the glass preform 20, the spacing between the dummy rods 21 is widened, so as to draw the glass preform 20, each fitting member 22 has a fitting part 22b in which the dummy rod 21 is fitted into one end side with a recessed shape, so as to be fitted, also, the other end side with a rod shape is grasped by the chuck 3, and, on drawing, in a state where the dummy rod 21 is inserted through, the upper end face 22e of the fitting part 22b is mounted with a heat shielding member 23 having an outside diameter equal to or larger than that of the upper end face 22e. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、ガラス母材の延伸方法に関するものである。   The present invention relates to a method for stretching a glass base material.

光ファイバ用ガラス母材等のガラス母材の製造工程において、例えば、ＶＡＤ法等で合成したガラス微粒子堆積体を焼結して透明ガラス化させたガラス母材の延伸を行う工程がある。その延伸工程として、ガラス母材の両端に接続されたダミー棒をそれぞれ石英ガラス製の嵌合部材に嵌合させて接続し、嵌合部材をそれぞれチャックにより把持して、ガラス母材を加熱して軟化させながらダミー棒同士の間隔を広げてガラス母材を延伸することが知られている（例えば、特許文献１参照）。
また、ダミー棒と嵌合部材とが十分に固定できるように、ダミー棒の外径と嵌合部材の嵌合部の内径と差を規定することも知られている（例えば、特許文献２参照）。 In a manufacturing process of a glass base material such as a glass base material for an optical fiber, there is a process of stretching a glass base material obtained by sintering a glass fine particle deposit synthesized by a VAD method or the like to form a transparent glass. As the stretching process, the dummy rods connected to both ends of the glass base material are fitted and connected to the fitting members made of quartz glass, respectively, the fitting members are each gripped by the chuck, and the glass base material is heated. It is known that the glass base material is stretched by widening the gap between the dummy bars while being softened (see, for example, Patent Document 1).
It is also known to define a difference between the outer diameter of the dummy bar and the inner diameter of the fitting portion of the fitting member so that the dummy bar and the fitting member can be sufficiently fixed (see, for example, Patent Document 2). ).

特開平６−２４７８４号公報JP-A-6-24784 特開平６−４０７３７号公報JP-A-6-40737

特許文献１に記載のガラス母材の延伸方法では、嵌合部材の長さ分だけダミー棒を短くすることができ、大型のガラス母材の製造に適している。しかしながら、ダミー棒と嵌合部材とは、双方にピンを貫通させ、ねじで固定することで一体化を図っているため、完全な接続ではなく、延伸中に延伸方向が変化してガラス母材が曲がるおそれがある。
そして、特許文献２に記載されているように、ダミー棒の外径と嵌合部材の嵌合部の内径との隙間を規定した場合においても、嵌合部材を繰り返し使用すると、嵌合部材は延伸時の熱によって加熱されて劣化（失透して削れる等）するため、嵌合部材の先端が変形して嵌合部の内径が変化したり、ねじが緩んだりして固定が不十分になることがあった。その場合、ガラス母材の延伸中に延伸方向にずれが生じ、延伸後のガラス母材に曲がりが発生する問題があった。また、嵌合部材の交換頻度が高くなることにより、ガラス母材の製造コストがかかってしまう。 In the glass base material stretching method described in Patent Document 1, the dummy bar can be shortened by the length of the fitting member, which is suitable for manufacturing a large glass base material. However, since the dummy rod and the fitting member are integrated by passing the pins through both sides and fixing them with screws, the glass base material is not a perfect connection, and the drawing direction changes during drawing. May bend.
As described in Patent Document 2, even when the gap between the outer diameter of the dummy rod and the inner diameter of the fitting portion of the fitting member is defined, if the fitting member is repeatedly used, the fitting member is Because it is heated by the heat during stretching and deteriorates (devitrifies and scrapes, etc.), the tip of the fitting member deforms, the inner diameter of the fitting part changes, the screw loosens, and fixing is insufficient There was. In this case, there is a problem that a deviation occurs in the stretching direction during stretching of the glass base material, and the glass base material after stretching is bent. Moreover, the manufacturing cost of a glass base material will start by the replacement frequency of a fitting member becoming high.

なお、嵌合部材を延伸用の熱源である加熱炉から遠ざけて熱による劣化を防止することも考えられるが、この場合には、加熱炉にガラス母材をセットする際に、適切な位置にセットできなくなり、精度の良い延伸ができなくなる。   Although it is possible to keep the fitting member away from the heating furnace, which is a heat source for drawing, to prevent deterioration due to heat, in this case, when setting the glass base material in the heating furnace, It becomes impossible to set, and accurate stretching cannot be performed.

そこで本発明の目的は、ガラス母材に接続されたダミー棒を支持する嵌合部材を、繰り返し使用することができるガラス母材の延伸方法を提供することにある。   Accordingly, an object of the present invention is to provide a glass base material stretching method that can repeatedly use a fitting member that supports a dummy rod connected to a glass base material.

上記課題を解決することのできる本発明に係るガラス母材の延伸方法は、ガラス母材の両端に接続されたダミー棒をそれぞれ嵌合部材に嵌合させて接続し、前記嵌合部材をそれぞれチャックにより把持して、前記ガラス母材を加熱して軟化させながら前記ダミー棒同士の間隔を広げて前記ガラス母材を延伸するガラス母材の延伸方法であって、前記嵌合部材は、凹状の一端側に前記ダミー棒を挿入して嵌合する嵌合部を有しかつ棒状の他端側がチャックで把持され、延伸時には前記ダミー棒を挿通した状態で前記凹状の一端側端面に、前記一端側端面と等しいかまたは大きい外径を有する遮熱部材が装着されていることを特徴とする。   The glass base material stretching method according to the present invention capable of solving the above-described problems is achieved by connecting and connecting the dummy rods connected to both ends of the glass base material to the fitting members, respectively. The glass base material is stretched by extending the glass base material by widening the gap between the dummy bars while being softened by heating the glass base material with a chuck, wherein the fitting member has a concave shape The other end side of the rod shape is gripped by a chuck, and the dummy rod is inserted into the concave one end side end surface while being stretched. A heat shield member having an outer diameter equal to or larger than the end surface on one end side is mounted.

また、本発明に係るガラス母材の延伸方法において、前記ダミー棒、前記嵌合部材及び前記遮熱部材の材質が石英ガラスであることが好ましい。   Moreover, in the extending | stretching method of the glass base material which concerns on this invention, it is preferable that the material of the said dummy rod, the said fitting member, and the said heat insulation member is quartz glass.

また、本発明に係るガラス母材の延伸方法において、前記遮熱部材が、光を反射させるかまたは透過光を散乱させて光の透過量を減少させるものであることが好ましい。   In the glass base material stretching method according to the present invention, it is preferable that the heat shield member is configured to reduce light transmission by reflecting light or scattering transmitted light.

また、本発明に係るガラス母材の延伸方法において、前記遮熱部材と、前記遮熱部材を貫通する前記ダミー棒との間隔が、０．０５ｍｍ以上１．０ｍｍ以下であることが好ましい。   Moreover, in the extending | stretching method of the glass base material which concerns on this invention, it is preferable that the space | interval of the said heat-shielding member and the said dummy rod which penetrates the said heat-shielding member is 0.05 mm or more and 1.0 mm or less.

また、本発明に係るガラス母材の延伸方法において、前記遮熱部材の厚さが、５ｍｍ以上であることが好ましい。   In the glass base material stretching method according to the present invention, it is preferable that a thickness of the heat shield member is 5 mm or more.

本発明によれば、ガラス母材の両端に接続されたダミー棒を接続する嵌合部材の、ガラス母材に対向する側となる凹状の一端側端面に、その一端側端面と等しいかまたは大きい外径を有する遮熱部材が装着されることにより、延伸時の加熱炉の熱によって嵌合部材が加熱されることを防止することができる。これにより、延伸時の熱による嵌合部材の劣化を防止することができるため、劣化による嵌合部の内径の変化や、ねじの緩み等を防止して、ガラス母材を確実に支持することができる。また、嵌合部材を繰り返し用いることができるため、ガラス母材の製造コストを低く抑えることができる。   According to the present invention, the concave one end side end surface, which is the side facing the glass base material, of the fitting member that connects the dummy rods connected to both ends of the glass base material is equal to or larger than the one end side end surface. By mounting the heat shield member having the outer diameter, it is possible to prevent the fitting member from being heated by the heat of the heating furnace during stretching. As a result, it is possible to prevent deterioration of the fitting member due to heat at the time of stretching, so that the glass base material is reliably supported by preventing changes in the inner diameter of the fitting portion due to deterioration, loosening of screws, etc. Can do. Moreover, since a fitting member can be used repeatedly, the manufacturing cost of a glass base material can be restrained low.

以下、本発明のガラス母材の延伸方法に係る実施形態の例を、図面を参照しつつ説明する。
図１は本発明の実施形態に係るガラス母材の延伸方法を実施する延伸装置の下部を示す概略構成図、図２（Ａ）は嵌合部材を装着した遮熱部材の平面図、図２（Ｂ）は嵌合部材を装着した遮熱部材の嵌合部側を示す縦断面図、図３はダミー棒と嵌合部材との接続部の構造を示す図１中III−III位置の横断面図である。 Hereinafter, an example of an embodiment according to the glass base material stretching method of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic configuration diagram showing a lower part of a stretching apparatus for performing a glass base material stretching method according to an embodiment of the present invention, FIG. 2A is a plan view of a heat shield member fitted with a fitting member, and FIG. (B) is a longitudinal sectional view showing the fitting portion side of the heat shield member with the fitting member attached, and FIG. 3 shows the structure of the connecting portion between the dummy rod and the fitting member, and is taken along the line III-III in FIG. FIG.

本実施形態に係るガラス母材の延伸方法は、図１に示すような延伸装置１０を用いて、ガラス母材２０を加熱するとともに、ガラス母材２０の両端に接続したダミー棒２１，２１同士の間隔を広げてガラス母材２０を延伸する方法である。ガラス母材２０は、例えば、コアを有するガラスロッド２０ａにガラス微粒子を堆積させた後に透明化したクラッド部２０ｂを有するものであり、ガラスロッド２０ａの両端部分にそれぞれダミー棒２１が接続されている。   The glass base material stretching method according to the present embodiment uses the stretching device 10 as shown in FIG. 1 to heat the glass base material 20 and connect the dummy bars 21 and 21 connected to both ends of the glass base material 20. This is a method of extending the glass base material 20 by widening the gap. The glass base material 20 has, for example, a clad portion 20b that is made transparent after depositing glass particles on a glass rod 20a having a core, and dummy rods 21 are connected to both ends of the glass rod 20a, respectively. .

図１に示す延伸装置１０は、ガラス母材２０を延伸するためにガラス母材２０の下端部付近を加熱して軟化させるヒータ１２及び炉心管１３を備えた加熱炉１１を有している。ガラス母材２０の両端に接続されたダミー棒２１の端部にはそれぞれ嵌合部材２２が取り付けられ、嵌合部材２２を延伸用チャック２３により把持する。なお、図１では下側のみ図示しているが、上側においては上下方向を逆とした同構造の嵌合部材２２及び延伸用チャック２３が設けられており、上側のダミー棒２１に接続されている。   A stretching apparatus 10 shown in FIG. 1 has a heating furnace 11 including a heater 12 and a furnace core tube 13 that heat and soften the vicinity of the lower end portion of the glass base material 20 in order to stretch the glass base material 20. A fitting member 22 is attached to each end of the dummy bar 21 connected to both ends of the glass base material 20, and the fitting member 22 is gripped by the stretching chuck 23. Although only the lower side is shown in FIG. 1, the upper side is provided with a fitting member 22 having the same structure with the up-down direction reversed and an extension chuck 23, and is connected to the upper dummy rod 21. Yes.

ガラス母材２０の延伸時には、上側の延伸用チャック２３を加熱炉１１の加熱領域に向けて移動させて徐々にガラス母材２０を加熱炉１１内に送り込むとともに、下側の延伸用チャック２３を上側の延伸用チャック２３より速い速度で加熱炉１１の下方に移動させてガラス母材２０を引き取ることで、炉心管１３内で軟化されたガラス母材２０の軟化部分が下方に延伸されるようになっている。それにより、所望の径に細径化されたガラス母材が得られる。   When the glass base material 20 is stretched, the upper stretching chuck 23 is moved toward the heating region of the heating furnace 11 so that the glass base material 20 is gradually fed into the heating furnace 11 and the lower stretching chuck 23 is moved. By moving the glass base material 20 at a higher speed than the upper stretching chuck 23 and taking the glass base material 20, the softened portion of the glass base material 20 softened in the furnace core tube 13 is stretched downward. It has become. Thereby, the glass base material reduced in diameter to a desired diameter is obtained.

図１及び図２に示すように、嵌合部材２２の棒状部２２ａの上方の端部には、外径が大きな円形断面の嵌合部２２ｂが設けられており、嵌合部２２ｂの上端面中心には、ダミー棒２１の下端部を挿入して嵌合可能な凹部２２ｃが形成されている。嵌合部２２ｂには径方向に取り付け用貫通穴２２ｄが設けられており、この取り付け用貫通穴２２ｄとダミー棒２１の下端部に形成されている貫通穴２１ａを貫通するピン２４によって、ダミー棒２１と嵌合部材２２とを連結している。また、図３に示すように、嵌合部２２ｂには複数個（本実施形態では４個）のねじ２５が径方向に取り付けられており、ダミー棒２１の下端部を強固に固定している。なお、ねじ２５は、ピン２４の上側及び下側の双方に設けることが望ましい。   As shown in FIGS. 1 and 2, a fitting section 22b having a large outer diameter is provided at the upper end of the rod-shaped portion 22a of the fitting member 22, and the upper end surface of the fitting section 22b. At the center, a recess 22c is formed in which the lower end of the dummy bar 21 can be inserted and fitted. The fitting portion 22b is provided with a mounting through hole 22d in the radial direction, and the dummy rod is formed by the pin 24 passing through the mounting through hole 22d and the through hole 21a formed in the lower end portion of the dummy rod 21. 21 and the fitting member 22 are connected. Further, as shown in FIG. 3, a plurality (four in this embodiment) of screws 25 are attached to the fitting portion 22b in the radial direction, and the lower end portion of the dummy bar 21 is firmly fixed. . The screws 25 are preferably provided on both the upper side and the lower side of the pin 24.

図２（Ａ）に示すように、嵌合部材２２の嵌合部２２ｂの上端面２２ｅには、嵌合部２２ｂの上端面（一端側端面）２２ｅの全面を覆う円形の遮熱部材３０が装着されている。遮熱部材３０は嵌合部２２ｂの外径と等しいかまたは大きな外径を有している。また、遮熱部材３０の外径は加熱炉１１の内径よりも小さい。遮熱部材３０は、加熱炉１１の内壁１１ａに接触することなく嵌合部材２２とともに上下移動可能となっている。遮熱部材３０の中央には、ダミー棒２１が挿嵌可能な貫通穴３１が設けられている。ダミー棒２１，嵌合部材２２及び遮熱部材３０の材質が石英ガラスであると、それぞれの熱膨張率が等しいため、互いの位置のずれを防止することができる。また、遮熱部材３０の上下の厚さは、薄すぎるとゆがみが発生しやすいため、５ｍｍ以上が好ましい。   As shown in FIG. 2A, a circular heat shield member 30 covering the entire upper end surface (one end surface) 22e of the fitting portion 22b is provided on the upper end surface 22e of the fitting portion 22b of the fitting member 22. It is installed. The heat shield member 30 has an outer diameter that is equal to or larger than the outer diameter of the fitting portion 22b. Further, the outer diameter of the heat shield member 30 is smaller than the inner diameter of the heating furnace 11. The heat shield member 30 can move up and down together with the fitting member 22 without contacting the inner wall 11 a of the heating furnace 11. A through hole 31 into which the dummy bar 21 can be inserted is provided in the center of the heat shield member 30. If the material of the dummy rod 21, the fitting member 22, and the heat shield member 30 is quartz glass, the respective thermal expansion coefficients are equal, and thus displacement of each other can be prevented. Moreover, since the upper and lower thickness of the heat shield member 30 is likely to be distorted if it is too thin, it is preferably 5 mm or more.

また、遮熱部材３０は、加熱炉１１内からの光を反射させたり、透過光を散乱させたりして光の透過量を減少させるものであることが好ましい。例えば、遮熱部材３０の表面をサンドペーパ等でこすってすりガラスや不透明な部材とすることにより、光や熱のエネルギーが嵌合部材２２に到達する量を減少させて、嵌合部材２２の劣化を防止することができる。   Moreover, it is preferable that the heat shielding member 30 is a member that reflects light from the inside of the heating furnace 11 or scatters transmitted light to reduce the amount of transmitted light. For example, by rubbing the surface of the heat shield member 30 with sandpaper or the like to make frosted glass or an opaque member, the amount of light or heat energy reaching the fitting member 22 is reduced, and the fitting member 22 is deteriorated. Can be prevented.

また、遮熱部材３０と、この遮熱部材３０を貫通するダミー棒２１との間隔α（図２参照）が、０．０５ｍｍ以上１．０ｍｍ以下であることが好ましい。すなわち、遮熱部材３０の貫通穴３１の内径が、ダミー棒２１の外径よりもαだけ大きくなるように貫通穴３１を設けることが望ましい。このように、ダミー棒２１と遮熱部材３０との隙間を０．０５ｍｍ以上１．０ｍｍ以下と小さくすることにより、嵌合部材２２に作用する光や熱を遮蔽しやすく、嵌合部材２２の劣化をより確実に防止することができる。   Moreover, it is preferable that the space | interval (alpha) (refer FIG. 2) of the thermal insulation member 30 and the dummy rod 21 which penetrates this thermal insulation member 30 is 0.05 mm or more and 1.0 mm or less. That is, it is desirable to provide the through hole 31 so that the inner diameter of the through hole 31 of the heat shield member 30 is larger than the outer diameter of the dummy rod 21 by α. In this way, by reducing the gap between the dummy bar 21 and the heat shield member 30 to 0.05 mm or more and 1.0 mm or less, it is easy to shield light and heat acting on the fitting member 22. Deterioration can be prevented more reliably.

延伸開始時には、ガラス母材２０が上方から加熱炉１１内に導入されて、ガラス母材２０の下端付近から加熱が開始される。その時、下側の嵌合部材２２が加熱炉１１内の加熱領域に接近するが、上記のような遮熱部材３０により嵌合部材２２に到達する光や熱が遮蔽されて劣化を防止する。また、延伸終了時には、ガラス母材２０の上端近傍が加熱炉１１内に導入されて、上側の嵌合部材２２が加熱炉１１内の加熱領域に接近するが、同様の遮熱部材３０により嵌合部材２２に到達する光や熱が遮蔽されて劣化を防止する。   At the start of stretching, the glass base material 20 is introduced into the heating furnace 11 from above, and heating starts near the lower end of the glass base material 20. At that time, the lower fitting member 22 approaches the heating region in the heating furnace 11, but the light and heat reaching the fitting member 22 are shielded by the heat shielding member 30 as described above to prevent deterioration. At the end of stretching, the vicinity of the upper end of the glass base material 20 is introduced into the heating furnace 11, and the upper fitting member 22 approaches the heating region in the heating furnace 11. Light and heat reaching the joint member 22 are shielded to prevent deterioration.

以上説明した本実施形態のガラス母材の延伸方法によれば、ガラス母材２０の両端に接続されたダミー棒２１を接続する嵌合部材２２におけるガラス母材２０に対向する面である嵌合部２２ｂの上端面２２ｅに、上端面２２ｅと等しいかまたは大きい外径を有する遮熱部材３０が装着されていることにより、延伸時の加熱炉１１の熱によって嵌合部材２２が加熱されることを防止することができる。これにより、延伸時の熱による嵌合部材２２の劣化を防止することができるため、劣化による嵌合部２２ｂの凹部２２ｃの内径の変化や、ねじ２５の緩み等を防止して、ガラス母材２０を確実に支持することができる。また、嵌合部材２２を繰り返し用いることができるため、ガラス母材２０の製造コストを低く抑えることができる。   According to the glass base material stretching method of the present embodiment described above, the fitting that is a surface facing the glass base material 20 in the fitting member 22 that connects the dummy rods 21 connected to both ends of the glass base material 20. The fitting member 22 is heated by the heat of the heating furnace 11 during stretching by mounting the heat shield member 30 having an outer diameter equal to or larger than the upper end surface 22e on the upper end surface 22e of the portion 22b. Can be prevented. Thereby, since the deterioration of the fitting member 22 due to heat at the time of stretching can be prevented, a change in the inner diameter of the concave portion 22c of the fitting portion 22b due to the deterioration, loosening of the screw 25, and the like are prevented, and the glass base material is prevented. 20 can be reliably supported. Moreover, since the fitting member 22 can be used repeatedly, the manufacturing cost of the glass base material 20 can be suppressed low.

なお、前述した実施形態においては、光や熱を遮蔽する遮熱部材３０として円形の平板のものを例示したが、平板以外の形状や円形以外の形状であってもよい。例えば、図４に示す遮熱部材３０Ａのように、遮熱部材３０Ａの外周に沿って嵌合部２２ｂの上端部に嵌合して被せる筒部３２を設けることもできる。この場合には、遮熱部材３０Ａが嵌合部材２２から脱落することを防止して確実に遮蔽することができる。
また、図５に示すように、遮熱部材３０Ｂをダミー棒２１と嵌合部材２２との間に挟むこともできる。この場合にも、遮熱部材３０Ｂが嵌合部材２２から脱落することを防止して、確実に遮蔽することができる。 In the embodiment described above, a circular flat plate is exemplified as the heat shield member 30 that shields light and heat, but a shape other than a flat plate or a shape other than a circle may be used. For example, like the heat shield member 30A shown in FIG. 4, it is possible to provide a cylindrical portion 32 that fits and covers the upper end portion of the fitting portion 22b along the outer periphery of the heat shield member 30A. In this case, the heat shield member 30 </ b> A can be reliably shielded by preventing the heat shield member 30 </ b> A from falling off the fitting member 22.
Further, as shown in FIG. 5, the heat shield member 30 </ b> B can be sandwiched between the dummy bar 21 and the fitting member 22. Also in this case, the heat shield member 30B can be prevented from falling off the fitting member 22, and can be reliably shielded.

また、前述した実施形態においては、ガラス母材２０を下方へ延伸する縦型の延伸方法について説明したが、延伸装置１０及びガラス母材２０を水平にして水平方向へ延伸する横型の延伸方法に適用することも可能である。横型の延伸方法を実施する際には、ガラス母材２０をその中心軸を回転軸として回転させると良い。   In the above-described embodiment, the vertical stretching method for stretching the glass base material 20 downward has been described. However, the horizontal stretching method for horizontally stretching the stretching apparatus 10 and the glass base material 20 is used. It is also possible to apply. When carrying out the horizontal stretching method, the glass base material 20 is preferably rotated with its central axis as the rotation axis.

外径１００ｍｍ、長さ６００ｍｍのガラス母材２０の両端に接続された外径３０ｍｍ、長さ２００ｍｍの石英ガラス製のダミー棒２１を、内径３１ｍｍ、外径４０ｍｍ、長さ２００ｍｍの石英ガラス製の嵌合部材２２に挿入して接続した。このとき、嵌合部材２２の端面には、外径６０ｍｍ、厚さ１０ｍｍの石英ガラス製の遮熱部材３０を取り付けた。嵌合部材２２を延伸用チャック２３で把持し、加熱炉１１でガラス母材２０の下端部を１８００℃に加熱して外径５０ｍｍに延伸した後、延伸したガラス母材を長さ８００ｍｍずつに分割した。以上の延伸工程を１日２回、２週間繰り返した後、延伸したガラス母材の曲がりを測定した。その結果、曲がりは最大で１ｍｍであった。一方、遮熱部材３０を設けずに、同様の延伸工程を行った結果、曲がりが最大４ｍｍとなった。これより、遮熱部材３０を用いた場合には、延伸時のガラス母材を安定して把持することができ、真っ直ぐに延伸することが可能であることがわかった。   A quartz glass dummy rod 21 having an outer diameter of 30 mm and a length of 200 mm connected to both ends of a glass base material 20 having an outer diameter of 100 mm and a length of 600 mm is made of quartz glass having an inner diameter of 31 mm, an outer diameter of 40 mm, and a length of 200 mm. The fitting member 22 was inserted and connected. At this time, a heat shield member 30 made of quartz glass having an outer diameter of 60 mm and a thickness of 10 mm was attached to the end face of the fitting member 22. The fitting member 22 is gripped by the stretching chuck 23, and the lower end portion of the glass base material 20 is heated to 1800 ° C. in the heating furnace 11 and stretched to an outer diameter of 50 mm. Divided. After the above stretching process was repeated twice a day for 2 weeks, the bending of the stretched glass base material was measured. As a result, the maximum bending was 1 mm. On the other hand, as a result of performing the same drawing process without providing the heat shield member 30, the bending became a maximum of 4 mm. From this, it was found that when the heat shield member 30 is used, the glass base material at the time of stretching can be stably held and can be stretched straight.

本発明の実施形態にかかるガラス母材の延伸方法を実施する延伸装置の下部を示す概略構成図である。It is a schematic block diagram which shows the lower part of the extending | stretching apparatus which enforces the extending | stretching method of the glass base material concerning embodiment of this invention. （Ａ）は嵌合部材を装着した遮熱部材の平面図、図２（Ｂ）は嵌合部材を装着した遮熱部材の嵌合部側を示す縦断面図である。(A) is a top view of the thermal insulation member which fitted the fitting member, FIG.2 (B) is a longitudinal cross-sectional view which shows the fitting part side of the thermal insulation member which fitted the fitting member. ダミー棒と嵌合部材との接続部の構造を示す図１中III−III位置の横断面図である。FIG. 3 is a cross-sectional view taken along the line III-III in FIG. 1 showing a structure of a connection portion between a dummy bar and a fitting member. 遮熱部材の変形例を示す縦断面図である。It is a longitudinal cross-sectional view which shows the modification of a heat shield member. 遮熱部材の変形例を示す縦断面図である。It is a longitudinal cross-sectional view which shows the modification of a heat shield member.

符号の説明Explanation of symbols

１０ 延伸装置
１１ 加熱炉
２０ ガラス母材
２１ ダミー棒
２２ 嵌合部材
２２ｂ 嵌合部
２２ｃ 凹部
２３ チャック
３０，３０Ａ，３０Ｂ 遮熱部材 DESCRIPTION OF SYMBOLS 10 Stretching apparatus 11 Heating furnace 20 Glass base material 21 Dummy rod 22 Fitting member 22b Fitting part 22c Recess 23 Chuck 30, 30A, 30B Heat shielding member

Claims (5)

ガラス母材の両端に接続されたダミー棒をそれぞれ嵌合部材に嵌合させて接続し、前記嵌合部材をそれぞれチャックにより把持して、前記ガラス母材を加熱して軟化させながら前記ダミー棒同士の間隔を広げて前記ガラス母材を延伸するガラス母材の延伸方法であって、
前記嵌合部材は、凹状の一端側に前記ダミー棒を挿入して嵌合する嵌合部を有しかつ棒状の他端側がチャックで把持され、延伸時には前記ダミー棒を挿通した状態で前記凹状の一端側端面に、前記一端側端面と等しいかまたは大きい外径を有する遮熱部材が装着されていることを特徴とするガラス母材の延伸方法。 The dummy bars connected to both ends of the glass base material are fitted and connected to the fitting members, respectively, the dummy members are gripped by the chucks, and the glass base material is heated and softened while the dummy bars are connected. A glass base material stretching method that stretches the glass base material with a gap between each other,
The fitting member has a fitting portion for inserting and fitting the dummy rod on one end side of the concave shape, and the other end side of the rod shape is gripped by a chuck, and the concave shape is inserted in the state where the dummy rod is inserted when extending. A heat-shielding member having an outer diameter equal to or larger than that of the one end side end face is attached to one end side end face of the glass base material. 前記ダミー棒、前記嵌合部材及び前記遮熱部材の材質が石英ガラスであることを特徴とする請求項１に記載のガラス母材の延伸方法。   The glass base material stretching method according to claim 1, wherein the dummy rod, the fitting member, and the heat shield member are made of quartz glass. 前記遮熱部材が、光を反射させるかまたは透過光を散乱させて光の透過量を減少させるものであることを特徴とする請求項１または２に記載のガラス母材の延伸方法。   3. The glass base material stretching method according to claim 1, wherein the heat shield member reflects light or scatters transmitted light to reduce the amount of transmitted light. 前記遮熱部材と、前記遮熱部材を貫通する前記ダミー棒との間隔が、０．０５ｍｍ以上１．０ｍｍ以下であることを特徴とする請求項１〜３の何れか一項に記載のガラス母材の延伸方法。   The glass according to any one of claims 1 to 3, wherein an interval between the heat shield member and the dummy bar penetrating the heat shield member is 0.05 mm or greater and 1.0 mm or less. Stretching method of base material. 前記遮熱部材の厚さが、５ｍｍ以上であることを特徴とする請求項１〜４の何れか一項に記載のガラス母材の延伸方法。   The glass base material stretching method according to any one of claims 1 to 4, wherein a thickness of the heat shield member is 5 mm or more.
JP2007311636A 2007-11-30 2007-11-30 Drawing method for glass preform Pending JP2009132586A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013010659A (en) * 2011-06-29 2013-01-17 Sumitomo Electric Ind Ltd Method for producing glass preform
CN108751693A (en) * 2018-06-11 2018-11-06 长飞光纤光缆股份有限公司 Chuck heat-proof device for glass take over lathe

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0640738A (en) * 1992-07-21 1994-02-15 Sumitomo Electric Ind Ltd Method and device for drawing optical fiber preform
JP2002047014A (en) * 2000-08-02 2002-02-12 Shin Etsu Chem Co Ltd Thermal shielding cylinder, device and method of manufacturing glass preform provided with it

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0640738A (en) * 1992-07-21 1994-02-15 Sumitomo Electric Ind Ltd Method and device for drawing optical fiber preform
JP2002047014A (en) * 2000-08-02 2002-02-12 Shin Etsu Chem Co Ltd Thermal shielding cylinder, device and method of manufacturing glass preform provided with it

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013010659A (en) * 2011-06-29 2013-01-17 Sumitomo Electric Ind Ltd Method for producing glass preform
CN108751693A (en) * 2018-06-11 2018-11-06 长飞光纤光缆股份有限公司 Chuck heat-proof device for glass take over lathe
CN108751693B (en) * 2018-06-11 2021-11-26 长飞光纤光缆股份有限公司 Chuck heat insulation device for glass adapter lathe

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