JP2749669B2 - Glass rod stretching method - Google Patents
Glass rod stretching methodInfo
- Publication number
- JP2749669B2 JP2749669B2 JP1292138A JP29213889A JP2749669B2 JP 2749669 B2 JP2749669 B2 JP 2749669B2 JP 1292138 A JP1292138 A JP 1292138A JP 29213889 A JP29213889 A JP 29213889A JP 2749669 B2 JP2749669 B2 JP 2749669B2
- Authority
- JP
- Japan
- Prior art keywords
- glass rod
- time
- outer diameter
- stretching
- chuck
- 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 - Lifetime
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
- C03B37/0124—Means for reducing the diameter of rods or tubes by drawing, e.g. for preform draw-down
- C03B37/01242—Controlling or regulating the down-draw process
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)
- 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、例えば光フアイバ母材等のガラス棒の延伸
方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for stretching a glass rod such as a base material of an optical fiber.
従来、例えば石英ガラス等からなる光フアイバ母材等
のガラス棒をより細径のガラス母材へと延伸する場合、
第６図に示すようにして延伸していた。Conventionally, for example, when stretching a glass rod such as an optical fiber preform made of quartz glass or the like into a smaller-diameter glass preform,
The film was stretched as shown in FIG.
すなわち、延伸しようとするガラス棒１の両端を同期
回転するチャック２、２により固定し、これを回転させ
ると共に矢印Ａの方向に、前記ガラス棒１に対して相対
的に移動するバーナ等の加熱源４によりこれを加熱軟化
せしめ、この際図面左側のチャック２の位置を固定し、
他方右側のチャック２を矢印Ｂ方向に移動させながらよ
り細径の延伸ガラス棒５へと延伸するものである。ここ
で符号３は前記加熱源４で加熱され元の外径Ｄから延伸
目標外径値d1へと変化している、いわゆるメニスカス部
分を示し、符号８は前記メニスカス部３の外径を測定す
るための例えばレーザー外径測定器の如き外径測定器
を、また符号９はこの外径測定器の測定値により加熱源
４及び図面右側の移動用のチャック２の移動速度Vmを制
御するための制御装置で、これは加熱源４に対してはモ
ータ10、チャック２に対してはモータ11へ制御信号を出
している。That is, both ends of the glass rod 1 to be stretched are fixed by chucks 2 and 2 which rotate synchronously, and are rotated and heated by a burner or the like which moves relatively to the glass rod 1 in the direction of arrow A. This is heated and softened by the source 4, and at this time, the position of the chuck 2 on the left side of the drawing is fixed,
On the other hand, while moving the right chuck 2 in the direction of arrow B, the chuck 2 is drawn to a drawn glass rod 5 having a smaller diameter. Here reference numeral 3 is changed to stretch the target outer diameter value d 1 from the outer diameter D of the source is heated by the heating source 4, shows the so-called meniscus portion, reference numeral 8 measures the outer diameter of the meniscus 3 the outer diameter measuring device such as e.g. a laser outer diameter measuring device for, also code 9 controls the moving speed V m of the chuck 2 for movement of the heating source 4 and the right side of the drawing by the measurements of the outer diameter measuring instrument This is a control device for outputting a control signal to the motor 10 for the heating source 4 and a motor 11 for the chuck 2.
通常前記装置により延伸する場合、定常延伸状態のチ
ャック速度Vcは次式により求められる。If stretching by conventional the apparatus, the chuck speed V c of the steady-stretched state is obtained by the following equation.
D2|VB|＝d1 2（|VB|＋Vc） ……（１） ここでD:ガラス棒の元の外径値 VB:加熱源４の移動速度（通常一定） d1:延伸目標外径値 前記（１）式から求められたチャック速度Vcで延伸を
開始し、必要に応じて前述した外径測定器８によるメニ
スカス部３の測定値ｄと同位置における延伸目標メニス
カス部外径値d0を比較しながら、制御装置９により、通
常は加熱源４の移動速度VBは一定にしたまま、チャック
２の移動速度Vmのみを前述したVcを中心に制御し、目標
外径値d0に近づけるようにしていた。D 2 | V B | = d 1 2 (| V B | + V c ) where D: the original outer diameter of the glass rod V B : the moving speed of the heating source 4 (usually constant) d 1 : stretching the target in the measurement value d and the same position of the meniscus 3 by the outer diameter measuring device 8 to start the drawing at a chuck speed V c obtained from the stretched target outer diameter value above (1), previously described as required while comparing meniscus outer diameter value d 0, the control unit 9, while the normal movement speed V B of the heat source 4 was constant, controls only the moving speed V m of the chuck 2 around the V c described above Then, the target outer diameter value d0 was approached.
ここで、前記（１）式における延伸目標外径値d1と延
伸目標メニスカス部外径値d0はd1≒d0で、それ故実際上
は両者は同じと見做してよい。Here, the (1) stretching the target meniscus outer diameter value d 0 and draw the target outer diameter value d 1 in the formula is d 1 ≒ d 0, therefore in practice may be regarded as both the same.
しかしながら、前記従来の延伸方法の場合、すなわち
定常延伸状態におけるチャック速度Vcで延伸開始時から
定常延伸状態まで立ち上げても、またVmにVcを中心にし
て制御装置９により外径測定器８の値に基づいてフィー
ドバックをかけても、延伸ガラス棒５の外径が長時間安
定せず、歩留りが悪いという問題があった。However, the case of the conventional stretching method, i.e. the outer diameter measured by the chuck speed V be raised from time of stretching start to steady stretched state c, and the control unit around a V c to V m 9 in the steady stretched state Even when feedback is applied based on the value of the vessel 8, there is a problem that the outer diameter of the drawn glass rod 5 is not stable for a long time and the yield is poor.
その理由は次のように推定される。すなわち、延伸開
始時から前述した（１）式を解いて求めたVcで延伸する
と、メニスカス部３において径方向の縮小速さが該部分
が横方向に伸びる速さよりも速い。そのため、例えば第
６図で説明すると、メニスカス部３の右端の外径が延伸
目標外径値d1よりも極端に小さくなってしまう。つまり
大きなくびれができてしまう。その結果定常延伸状態、
すなわち延伸前のガラス棒１の外径Ｄから延伸ガラス棒
５の延伸目標外径値d1へと、その外径が滑らかに変化す
る状態まで近づけるのに時間がかかる、と推定された。The reason is presumed as follows. That is, when stretched at V c obtained by solving the above-mentioned (1) from the start of stretching, shrinking rate in the radial direction in the meniscus 3 is faster than the speed at which the partial stretches laterally. Therefore, for example, described in FIG. 6, the outer diameter of the right end of the meniscus portion 3 becomes extremely smaller than the stretching target outer diameter value d 1. That is, a large neck is formed. As a result, steady stretching state,
That to stretch the target outer diameter value d 1 of the outer diameter extending from D glass rod 5 of the glass rod 1 before drawing, the outer diameter takes time to approximate to a state changes smoothly, and was estimated.
本発明はかかる課題に鑑みなされたもので、ガラス棒
の両端を、同期回転し、かつ該ガラス棒の長手方向に移
動可能なチャックにより固定し、該ガラス棒をその長手
方向に沿って前記ガラス棒に対して相対的に移動する加
熱源によりその一端から他端へと加熱しつつ、当該ガラ
ス棒の加熱開始端側をその長手方向に延伸するガラス棒
の延伸方法において、 延伸開始時間T1以前は、前記チャックと前記加熱源と
を静止させた状態で前記加熱源により前記ガラス棒の予
加熱を行い、 延伸開始時間T1の時点で、前記チャックの移動と前記
加熱源の移動とを開始し、 延伸開始時間T1以降は、延伸開始時間T1から該ガラス
棒のメニスカス部の横方向の伸びが定常状態に達する時
間T2までの時間（T2−T1）と、該ガラス棒のメニスカス
部の粘度が106.2〜107.0ポアズの範囲内にある位置で測
定したメニスカス部測定外径値をｄ、前記測定位置にお
ける延伸目標メニスカス部外径値をd0、該ガラス棒の元
の外径値をＤとしたとき、ｄがＤから|d−d0|＜0.1d0の
範囲に入るまでの時間とが一致するように、チャック速
度Vmをあらかじめ実験して求めた値に設定して延伸立ち
上げ制御を行い、 時間T2となった後は、前記ｄとd0との差を検出してチ
ャック速度にフィードバックさせて、定常延伸状態にお
ける制御に切り換える ことを特徴とするものである。The present invention has been made in view of such a problem, and both ends of a glass rod are synchronously rotated and fixed by a chuck movable in a longitudinal direction of the glass rod, and the glass rod is fixed along the longitudinal direction of the glass rod. In a method of stretching a glass rod in which the heating start end side of the glass rod is stretched in the longitudinal direction while heating from one end to the other end by a heating source moving relatively to the rod, a stretching start time T 1 previously, performs preheating of the glass rod by the heat source in a stationary state and said heat source and said chuck, at the time of stretching start time T 1, and the movement of the heating source and the moving of the chuck started, stretching start time T 1 and later, the time from drawing the starting time T 1 to time T 2 the transverse extension of the meniscus portion of the glass rod reaches a steady state (T 2 -T 1), the glass the viscosity of the meniscus portion of the rod 10 6.2 10 a meniscus portion unmeasured diameter value measured at a position which is within the range of 7.0 poise d, wherein d 0 stretching target meniscus outer diameter value at the measurement position, the original outer diameter value of the glass rod is D , d is the D | d-d 0 | <as the time to fall within the scope of 0.1d 0 matches, stretching raising control is set to a value determined in advance experimentally chuck velocity V m performs, after a time T 2, and is fed back to the chuck speed by detecting the difference between the d and d 0, is characterized in that the switching to control in a steady drawing condition.
尚、メニスカス部の横方向の伸びが定常状態に達す
る、とは以下のように定義する。It should be noted that the fact that the lateral extension of the meniscus portion reaches a steady state is defined as follows.
第７図に示すように外径Ｄのガラス棒１から延伸目標
メニスカス部外径値d0の延伸ガラス棒５へと、時間の経
過と共にメニスカス部３のプロファイルは図中の符号１
〜５へと次第に変化していく。この変化の中で外径が最
小になる位置L2は次第に外径変化開始点L1から一定の距
離Lmのところで現れるようになる。このように最小外径
値がL1から一定の距離Lmのところで現れるようになった
状態を、メニスカス部３の横方向の伸びが定常状態に達
する、と定義することにする。As shown in FIG. 7, the profile of the meniscus portion 3 changes from the glass rod 1 having the outer diameter D to the drawn glass rod 5 having the outer diameter value d0 of the target meniscus portion over time.
It gradually changes to ~ 5. Position L 2 of the outer diameter is minimized in this change will gradually emerge from the outer diameter change starting point L 1 at a constant distance L m. The state where the minimum outer diameter value so began to emerge at the L 1 constant distance L m, the lateral elongation of the meniscus part 3 reaches a steady state, and to be defined.
また、メニスカス部の外径測定位置を、該メニスカス
部３の粒度が106.2〜107.0ポアズの範囲内の位置と限定
した理由は、本発明に到る前に予め行っていた種々の実
験から、この範囲であると一つには応答性が良いこと、
そして二つめとしてはメニスカス部測定外径値ｄと延伸
目標メニスカス部外径値d0の差も比較的小さいためで、
いづれにせよ制御性を考慮するとこの範囲が最適である
ことを見出していたからである。Further, the outer diameter measuring position of the meniscus part, why the particle size of the meniscus portion 3 is limited to the position within the range of 10 6.2 to 10 7.0 poise, the various experiments that were carried out in advance before reaching the present invention In this range, one of the reasons is good responsiveness,
And the second is because the difference between the meniscus portion measured outer diameter value d and the stretching target meniscus portion outer diameter value d 0 is also relatively small,
In any case, it has been found that this range is optimal in consideration of controllability.
〔作用〕 このような方法でガラス棒を延伸すると、メニスカス
部の横方向の伸びが定常状態に達しており、かつその外
径値ｄも同位置における延伸目標メニスカス部外径値d0
に近い状態まで細ってきているため、極めて短時間に安
定した延伸状態、すなわちメニスカス部のプロファイル
がガラス棒の元の外径Ｄから延伸後のメニスカス部外径
値d1へと滑らかに変化する、いわゆる定常延伸状態に立
ち上げることができる。[Operation] When the glass rod is stretched by such a method, the lateral elongation of the meniscus portion has reached a steady state, and the outer diameter value d is also the target meniscus portion outer diameter value d 0 at the same position.
Since it has thinned to a state close to smoothly change very short time in a stable stretched state, i.e. the profile of the meniscus portion to the meniscus outer diameter value d 1 after drawing from the original outer diameter D of the glass rod , A so-called steady stretching state.
以下本発明の実施例を図面を参照しながら詳細に説明
する。Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
本発明者は先に第７図に示したように外径Ｄのガラス
棒１から延伸目標外径値d1の延伸ガラス棒５へと延伸す
ると、時間の経過と共にメニスカス部３のプロファイル
は図中の符号１〜５へと次第に変化していくこと、更に
この変化の中で外径が最小になる位置L2は次第に外径変
化開始点L1から一定の距離Lmのところで現れるようにな
ることを見出した。同時にこのLmが出現する以前におい
ては、いかに延伸速度、すなわちチャック速度Vmを制御
しても、該制御に対する応答が鈍く、結果的にはかえっ
て延伸ガラス棒５の外径の安定が長時間損なわれること
も見出した。When this inventor extends from glass rod 1 having an outer diameter D as shown in FIG. 7 above the drawn glass rod 5 of stretching nontarget diameter value d 1, the profile of the meniscus portion 3 over time Figure It gradually changes from the reference number 1 to 5 in the middle, and furthermore, the position L 2 where the outer diameter becomes minimum in this change gradually appears at a constant distance L m from the outer diameter change start point L 1. I found out. At the same time, prior to the appearance of L m , no matter how the stretching speed, that is, the chuck speed V m is controlled, the response to the control is slow, and consequently the outer diameter of the stretched glass rod 5 stabilizes for a long time. I also found it to be damaged.
そこで、従来一般的に行われているように、チャック
速度Vmを前記（１）式から求められるVcを中心にし、こ
れにメニスカス部３の測定外径値ｄと同測定位置におけ
る延伸目標メニスカス部外径値d0の差でフィードバック
をかけるのは前述したLmが出現した後、すなわちメニス
カス部３の横方向の伸びが定常状態に達した後とし、そ
れ以前は例えばVcよりも小さい速度で延伸し、メニスカ
ス部３の径方向の縮小速度を小さく抑え、メニスカス部
３の測定外径値ｄが同測定位置における延伸目標メニス
カス部外径値d0に達する時間とメニスカス部３の横方向
の伸びが定常状態に達する時間、すなわちLmが現れる時
間とを一致させれば、より制御性良く、かつ短時間に延
伸の立ち上げができるのではないかと考えた。Therefore, as is conventionally practiced, the chuck speed V m around the V c obtained from the equation (1), stretching goal in unmeasured diameter value d and the measurement position of the meniscus 3 to after L m mentioned above is to apply a feedback difference meniscus outer diameter value d 0 appeared, that the after lateral stretching of the meniscus portion 3 has reached a steady state, it formerly than, for example, V c The film is stretched at a small speed, the reduction speed in the radial direction of the meniscus portion 3 is kept small, and the time required for the measured outer diameter value d of the meniscus portion 3 to reach the target outer meniscus portion outer diameter value d 0 at the same measurement position is determined. time lateral elongation reaches a steady state, that is, caused to coincide with the time and the L m appears, more good controllability, and thought that it would be can launch a short time to draw.
しかしながら現実の問題として延伸中にLmを測定する
ことはメニスカス部３の開始点、すなわちL1の位置を正
確に捕らえることが難しいため困難である。そこでLmの
替わりに制御切替点に成り得るものは何かを検討した。However measuring the L m during the stretching as real problem is the starting point of the meniscus part 3, i.e. it is difficult since it is difficult to capture accurately the position of L 1. Therefore, what could be a control switching point instead of L m was examined.
そこで加熱源４の各種条件を一定にした状態でチャッ
ク速度Vmをある範囲内で変化させ、前記Lmが現れる時間
を測定した。Therefore varied within a certain range the chuck speed V m of the various conditions of the heat source 4 while the constant and measuring the time the L m appears.
その結果、通常用いられる延伸速度範囲においては第
１図に示すように延伸開始時間T1後このLmが出現する時
間T2までの時間はチャック速度Vmに関係なくほぼ一定で
あることが判った。すなわちLmに替えて（T2−T1）を制
御切替点として使用できることが判明した。As a result, it in the normal drawing speed range used is substantially constant regardless of the time the chuck velocity V m up to the time T 2 which is the L m after stretching starting time T 1 as shown in Figure 1 appears understood. That is, it was found that (T 2 −T 1 ) can be used as a control switching point instead of L m .
次に前述したように（T2−T1）後、すなわちメニスカ
ス部３の横方向の伸びが定常状態に達したときに、前述
したメニスカス部３の粘度が106.2〜107.0ポアズの範囲
内のある位置で測定したメニスカス部測定外径値ｄが同
測定位置における延伸目標メニスカス部外径値d0にほぼ
等しくなっていれば、従来の制御方法への切り替えが短
時間に行えるとの想定のもとに（T2−T1）後にメニスカ
ス部測定外径値ｄが同位置における延伸目標メニスカス
部外径値d0になるようなチャック速度Vmを決定すべく、
第２図に示すような実験を行った。これはチャック速度
VmをV1、V2……、V5に設定し、各々の速度で延伸を行
い、（T2−T1）後に延伸したガラス棒５の外径を測定し
たものである。その結果チャック速度VmがV4のとき前記
時間後、外径値がほぼd0になることが判った。Next, as described above, after (T 2 −T 1 ), that is, when the lateral elongation of the meniscus portion 3 reaches a steady state, the viscosity of the meniscus portion 3 falls within the range of 10 6.2 to 10 7.0 poise. long as almost equal to the stretched target meniscus outer diameter value d 0 at the meniscus portion unmeasured diameter value d is equal measurement position measured at a certain position, assumption that switching to a conventional control method can be performed in a short time to determine the (T 2 -T 1) chuck velocity V m such as meniscus unmeasured diameter value d is stretched target meniscus outer diameter value d 0 at the same position after the under,
An experiment as shown in FIG. 2 was performed. This is the chuck speed
V m was set to V 1 , V 2, ..., V 5 , stretching was performed at each speed, and after (T 2 −T 1 ), the outer diameter of the stretched glass rod 5 was measured. After a result the time when the chuck speed V m is V 4, it was found that the outer diameter value is approximately d 0.
そこでこれまでの考え及び実験を元に作成した第３図
に示すフローチャートに従って、かつ第６図に示した延
伸装置を用いてガラス棒１から延伸ガラス棒５への延伸
立ち上げを行った。まず制御装置９に延伸目標メニスカ
ス部外径値d0、チャック移動開始時間T1、制御切替時間
T2、延伸立ち上げ時のチャック移動速度V4、加熱源４の
移動速度VB等必要設定値を入力する。そして加熱源４に
より予加熱を開始し、所定加熱時間に達したら、すなわ
ちT1になったら加熱源４の移動速度をVB、チャック速度
をV4にして延伸を開始する。続いてメニスカス部３の横
方向の伸びが定常状態Lmに達したら、すなわちT2に達し
たらチャック速度をVcへと上げ、同時に定常延伸状態で
の制御に入る。すなわち、前記Vcを中心に外径測定器８
によるメニスカス部測定外径値ｄと同測定位置における
延伸目標メニスカス部外径値d0を比較しながら、この差
が所定範囲内に入るように制御装置９によりフィードバ
ック制御をかけ、チャック移動速度Vmをコントロールす
る。Therefore, the stretching from the glass rod 1 to the stretched glass rod 5 was started up in accordance with the flowchart shown in FIG. 3 created based on the thoughts and experiments so far and using the stretching apparatus shown in FIG. First, the controller 9 sends the target outer meniscus portion outer diameter value d 0 , the chuck movement start time T 1 , and the control switching time.
Input necessary setting values such as T 2 , the moving speed V 4 of the chuck at the time of starting the stretching, and the moving speed V B of the heating source 4. Then the heating source 4 starts preheating, reaches the predetermined heating time, i.e. V B the moving speed of the heating source 4 When turned T 1, starts stretching the chuck speed V 4. When followed by transverse stretching of the meniscus part 3 reaches a steady state L m, i.e. raised and the chuck speed reaches the T 2 to V c, into the control in the steady stretched state at the same time. That is, the outer diameter measuring device 8 about the V c
The feedback control is performed by the controller 9 so that the difference falls within a predetermined range while comparing the meniscus portion outer diameter value d at the same measurement position with the meniscus portion outer diameter value d 0 at the same measurement position. Control m .
尚、T2に達したかどうかと同時に、さらにメニスカス
部３での外径測定値ｄが|d−d0|＜0.1d0の範囲内に到達
したかをも制御装置９にて判断させ、両者が共にYESで
あることを確認後前述したように定常延伸状態での制御
に入れば、仮に立ち上げ中に何か突発的な事態が生じた
としてもこれに対処できるので好ましい。The controller 9 also determines whether the measured outer diameter d at the meniscus portion 3 has reached the range of | d−d 0 | <0.1d 0 at the same time as whether or not T 2 has been reached. After confirming that both are YES, it is preferable to start the control in the steady stretching state as described above, since even if a sudden situation occurs during startup, this can be dealt with.
上記制御パターンを整理すると第４図（ａ）のように
なる。ここで第４図（ａ）では立ち上げ時のVmを一定値
のV4としたが、V4と立ち上げまでの所要時間の積分値、
すなわちV4×（T2−T1）の値が同じであれば他にも、例
えばVmを第４図（ｂ）、（ｃ）に示すパターンにしても
同様の結果が得られる。いずれにせよ重要な点は、Lmが
出現した後、つまりT2後に、定常延伸状態における従来
一般に行われている制御に切替える点にある。FIG. 4 (a) shows an arrangement of the above control patterns. Here has been a V m of FIG. 4 (a) the time of start-up and V 4 of the fixed value, the integral value of the necessary time to rise and V 4,
That is, if the value of V 4 × (T 2 −T 1 ) is the same, similar results can be obtained by changing V m to the pattern shown in FIGS. 4B and 4C. Important anyway, after the L m has appeared, that after T 2, there in that switching to the control being conducted in conventionally in a steady drawing condition.
ここで|d−d0|＜0.1d0の限定を設けた理由は、この範
囲の近傍で実験を行った結果、ｄ−d0＞0.1d0だと制御
切替えが速すぎて、まだ立ち上げに時間がかかり過ぎる
こと、逆にd0−ｄ＞0.1d0だとくびれが大きくなり過ぎ
ていて、やはり定常延伸状態に達するまで時間がかかり
過ぎるためである。Here, the reason for setting the limitation of | d−d 0 | <0.1d 0 is that, as a result of an experiment conducted near this range, if d−d 0 > 0.1d 0 , the control switching is too fast and the control is still standing. that the time to raise is too much, contrary to constricted that it is d 0 -d> 0.1d 0 is not too large, it is because it takes too much time to also reach a steady stretched state.
以下に本発明の具体的実施例を示す。 Hereinafter, specific examples of the present invention will be described.
ガラス棒１の外径Ｄ＝24mm、延伸目標メニスカス部外
径値d0＝12.8mm、T1＝０、T2＝180sec、加熱源４の移動
速度VB＝10mm/secと設定し、前記T2までのチャック速
度、すなわち延伸立ち上げのチャック移動速度Vm＝13.5
mm/secとして延伸を行い、メニスカス部３の測定外径値
が13.7mmで、しかも時間がT2に達した後定常の延伸制
御、すなわちチャック移動速度Vc＝25.2mm/secを中心に
メニスカス部３の外径測定結果に基づいてチャック速度
Vmにフィードバック制御をかけた。その結果を第５図に
示す。Outer diameter D = 24 mm of the glass rod 1, set stretched targets meniscus outer diameter value d 0 = 12.8mm, T 1 = 0, T 2 = 180sec, a moving velocity V B = 10mm / sec of the heating source 4, wherein chuck speeds of up to T 2, i.e. the chuck moving speed of the stretching raising V m = 13.5
Stretching is performed at a rate of mm / sec, and the measured outer diameter of the meniscus portion 3 is 13.7 mm, and after the time reaches T 2 , steady stretching control, that is, the chuck moving speed V c = 25.2 mm / sec. Chuck speed based on the outer diameter measurement result of part 3
Multiplied by the feedback control to V m. The results are shown in FIG.
一方前記実施例と同じ外径24mmのガラス棒１を前記実
施例と同様に12.8mmに延伸するに際して、最初からVm＝
Vc、すなわちVm＝25.2mm/secを中心に、これに定常状態
での制御と同様の制御方法、すなわちメニスカス部３の
外径測定値ｄと同測定位置における延伸目標メニスカス
部外径値d0の差を検出しながらフィードバック制御をか
ける、いわゆる従来方法にて延伸した。その結果も従来
例として第５図中に示した。On the other hand, when the same glass rod 1 having an outer diameter of 24 mm as in the above embodiment was stretched to 12.8 mm in the same manner as in the above embodiment, V m =
V c , that is, V m = 25.2 mm / sec, and a control method similar to the control in the steady state, that is, the outer diameter measured value d of the meniscus portion 3 and the outer diameter value of the target meniscus portion at the same measurement position and feedback control while detecting the difference d 0, and stretched by a so-called conventional method. The results are also shown in FIG. 5 as a conventional example.
両者を比較すると、本発明の方法では約270秒でほぼ
延伸目標外径に安定した状態で達しているのに対して、
従来方法による立ち上げでは、420秒経過してもいまだ
安定状態に達していないことがわかる。Comparing the two, the method of the present invention has almost reached the stretching target outer diameter in a stable state in about 270 seconds,
It can be seen that the startup by the conventional method has not yet reached the stable state even after 420 seconds have elapsed.
以上述べたように本発明の延伸方法によれば、ガラス
棒の延伸立ち上げを極めて短時間に、しかも容易に行な
える。As described above, according to the stretching method of the present invention, the stretching start of the glass rod can be easily performed in a very short time.
第１図は横方向の伸びが所定時間後に安定する状態を示
す図、第２図は所定時間後に延伸目標外径値を達成でき
るチャック移動速度を求めた図、第３図は本発明の一実
施例を示すフローチャート、第４図（ａ）〜（ｃ）は本
発明の一実施例及び他の実施例のチャック速度の制御パ
ターンを示す図、第５図は本発明の実施例と従来例との
制御パターンおよびその時の延伸ガラス棒の外径を示す
グラフ、第６図は本発明に係わる延伸装置の概略図、第
７図はガラス棒を延伸した際に出現する横方向の伸びが
安定した状態を示す概略図である。 １……ガラス棒、２……チャック、３……メニスカス
部、４……加熱源、５……延伸ガラス棒、８……外径測
定器、９……制御装置FIG. 1 is a view showing a state in which the lateral elongation is stabilized after a predetermined time, FIG. 2 is a view showing a chuck moving speed capable of achieving a target outer diameter value after a predetermined time, and FIG. 4 (a) to 4 (c) are diagrams showing a control pattern of a chuck speed according to one embodiment of the present invention and another embodiment, and FIG. 5 is a diagram showing an embodiment of the present invention and a conventional example. And FIG. 6 is a schematic view of a stretching apparatus according to the present invention, and FIG. 7 shows that the lateral elongation appearing when the glass rod is stretched is stable. FIG. DESCRIPTION OF SYMBOLS 1 ... Glass rod, 2 ... Chuck, 3 ... Mensic part, 4 ... Heating source, 5 ... Stretched glass rod, 8 ... Outside diameter measuring instrument, 9 ... Control device
Claims (1)
ラス棒の長手方向に移動可能なチャックにより固定し、
該ガラス棒をその長手方向に沿って前記ガラス棒に対し
て相対的に移動する加熱源によりその一端から他端へと
加熱しつつ、当該ガラス棒の加熱開始端側をその長手方
向に延伸するガラス棒の延伸方法において、 延伸開始時間T1以前は、前記チャックと前記加熱源とを
静止させた状態で前記加熱源により前記ガラス棒の予加
熱を行い、 延伸開始時間T1の時点で、前記チャックの移動と前記加
熱源の移動とを開始し、 延伸開始時間T1以降は、延伸開始時間T1から該ガラス棒
のメニスカス部の横方向の伸びが定常状態に達する時間
T2までの時間（T2−T1）と、該ガラス棒のメニスカス部
の粘度が106.2〜107.0ポアズの範囲内にある位置で測定
したメニスカス部測定外径値をｄ、前記測定位置におけ
る延伸目標メニスカス部外径値をd0、該ガラス棒の元の
外径値をＤとしたとき、ｄがＤから|d−d0|＜0.1d0の範
囲に入るまでの時間とが一致するように、チャック速度
Vmをあらかじめ実験して求めた値に設定して延伸立ち上
げ制御を行い、 時間T2となった後は、前記ｄとd0との差を検出してチャ
ック速度にフィードバックさせて、定常延伸状態におけ
る制御に切り換える ことを特徴とするガラス棒の延伸方法。1. The glass rod is fixed at both ends by a chuck which is synchronously rotated and movable in the longitudinal direction of the glass rod,
While the glass rod is heated from one end to the other end by a heating source moving relatively to the glass rod along the longitudinal direction, the heating start end side of the glass rod is stretched in the longitudinal direction. in the stretching method of the glass rod, the stretching starting time T 1 previously, the chuck and performs preheating of the glass rod by the heat source are kept stationary and the heat source at the time of stretching start time T 1, starts the movement of the heating source and the movement of the chuck, it extends the start time T 1 after the time the transverse elongation of the meniscus portion of the glass rod from the drawing start time T 1 is reached steady state
T 2 until the time (T 2 -T 1), the meniscus portion unmeasured diameter value at which the viscosity of the meniscus was measured at a position which is within the range of 10 6.2 to 10 7.0 poise of the glass rod d, the measuring position When the outer diameter value of the target meniscus portion at d is d 0 and the original outer diameter value of the glass rod is D, the time required for d to fall from D to the range of | d−d 0 | <0.1d 0 is Chuck speed to match
Set to a value determined in advance experimentally V m perform stretching raising control, after a time T 2, and is fed back to the chuck speed by detecting the difference between the d and d 0, steady A method for drawing a glass rod, comprising switching to control in a drawn state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1292138A JP2749669B2 (en) | 1989-11-09 | 1989-11-09 | Glass rod stretching method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1292138A JP2749669B2 (en) | 1989-11-09 | 1989-11-09 | Glass rod stretching method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03153538A JPH03153538A (en) | 1991-07-01 |
| JP2749669B2 true JP2749669B2 (en) | 1998-05-13 |
Family
ID=17778032
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1292138A Expired - Lifetime JP2749669B2 (en) | 1989-11-09 | 1989-11-09 | Glass rod stretching method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2749669B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20150007616A1 (en) * | 2013-07-02 | 2015-01-08 | Shin-Etsu Chemical Co., Ltd. | Glass base material elongating method |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0719741B1 (en) * | 1994-12-27 | 1998-05-27 | Hoya Corporation | Process for the production of polarizing glass |
| WO2004000740A1 (en) * | 2002-06-19 | 2003-12-31 | Sumitomo Electric Industries, Ltd. | Method for drawing glass parent material and drawing machine for use therein |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5112809A (en) * | 1974-07-09 | 1976-01-31 | Komatsu Denshi Kinzoku Kk | Sekiei mataha garasuno seikeihoho |
| JPS61295250A (en) * | 1985-06-21 | 1986-12-26 | Mitsubishi Cable Ind Ltd | Drawing method for parent material for optical fiber |
-
1989
- 1989-11-09 JP JP1292138A patent/JP2749669B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20150007616A1 (en) * | 2013-07-02 | 2015-01-08 | Shin-Etsu Chemical Co., Ltd. | Glass base material elongating method |
| US9328012B2 (en) * | 2013-07-02 | 2016-05-03 | Shin-Etsu Chemical Co., Ltd. | Glass base material elongating method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03153538A (en) | 1991-07-01 |
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