JP5429561B2 - Glass rod manufacturing apparatus and manufacturing method - Google Patents

Glass rod manufacturing apparatus and manufacturing method Download PDF

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JP5429561B2
JP5429561B2 JP2010041968A JP2010041968A JP5429561B2 JP 5429561 B2 JP5429561 B2 JP 5429561B2 JP 2010041968 A JP2010041968 A JP 2010041968A JP 2010041968 A JP2010041968 A JP 2010041968A JP 5429561 B2 JP5429561 B2 JP 5429561B2
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supply pipe
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修 小谷
優 南部
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Nippon Electric Glass Co Ltd
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本発明は、ガラス棒の製造装置とガラス棒の製造方法に関する。   The present invention relates to a glass rod manufacturing apparatus and a glass rod manufacturing method.

従来、ガラス棒の製造方法として、溶融ガラスを筒状の鋳型の入口に流し込み、棒状に型成形したガラス棒を鋳型の出口から引き出してガラス棒を連続的に製造する方法が知られている（例えば、特許文献１参照）。この方法で製造されたガラス棒はその後、輪切り分割され、例えば光学素子をプレス成形するためのガラス素材として用いられる。   Conventionally, as a method of manufacturing a glass rod, a method of continuously manufacturing a glass rod by pouring molten glass into an inlet of a cylindrical mold and drawing out the glass rod molded into a rod shape from the outlet of the mold is known ( For example, see Patent Document 1). The glass rod produced by this method is then divided into round pieces and used as a glass material for press-molding an optical element, for example.

ところで、溶融ガラスをガラス棒に型成形する際には、ガラス棒の脈理欠陥等の原因となる溶融ガラスの失透を防ぐことが重要である。そこで、従来では、溶融ガラスを鋳型に供給する供給パイプに加熱手段を設けて供給パイプの温度調節を行ったり（例えば、特許文献２参照）、鋳型に加熱手段を設けて鋳型の温度調節を行ったりしている（上記特許文献１参照）。   By the way, when molding molten glass into a glass rod, it is important to prevent devitrification of the molten glass, which causes striae defects and the like of the glass rod. Therefore, conventionally, heating means is provided in the supply pipe for supplying molten glass to the mold to adjust the temperature of the supply pipe (see, for example, Patent Document 2), or heating means is provided in the mold to adjust the temperature of the mold. (See Patent Document 1 above).

特開２００６−５２１０９号公報（図２参照）JP 2006-52109 A (see FIG. 2) 特開２００６−１４３５６３号公報JP 2006-143563 A

しかしながら、これら従来の方法によれば、失透現象をある程度抑制することができるものの、例えば高屈折率の光学ガラス等のように成形時の粘度が低く失透し易いガラス材を用いる場合、その失透を十分に抑制することができない難点があり、失透や脈理等の欠陥の少ないより高品質なガラス棒が求められている。   However, according to these conventional methods, although the devitrification phenomenon can be suppressed to some extent, when using a glass material that has a low viscosity during molding and is easy to devitrify, such as a high refractive index optical glass, There is a problem that devitrification cannot be sufficiently suppressed, and there is a demand for a higher quality glass rod with less defects such as devitrification and striae.

本発明は、従来のガラス棒の製造方法に上記のような難点があったことに鑑みて為されたもので、たとえ高屈折率の光学ガラス等のように粘度が低く失透し易いガラス材を用いた場合でも、失透を防いで高品質のガラス棒を製造することができる、ガラス棒の製造装置と製造方法を提供することを課題とする。   The present invention has been made in view of the above-described drawbacks in the conventional method for producing glass rods, and is a glass material that has a low viscosity and is easily devitrified, such as optical glass with a high refractive index. It is an object of the present invention to provide a glass rod manufacturing apparatus and a manufacturing method capable of manufacturing a high-quality glass rod while preventing devitrification even when the glass is used.

本発明者は、溶融ガラスの失透が、鋳型内における溶融ガラスの冷却速度に起因する他に、鋳型の入口に供給された溶融ガラスが、溶融ガラスと鋳型面と雰囲気との境界部で冷却されることによっても発生し成長することに注目し、本発明を完成するに至った。   In addition to the devitrification of the molten glass caused by the cooling rate of the molten glass in the mold, the inventor cooled the molten glass supplied to the inlet of the mold at the boundary between the molten glass, the mold surface and the atmosphere. The present invention has been completed by paying attention to the fact that it is generated and grows.

即ち、本発明は、供給パイプから流下する溶融ガラスを筒状の鋳型の上端の入口に流し込み、棒状に型成形したガラス棒を該鋳型の下端の出口から引き出すガラス棒の製造装置であって、
前記供給パイプの周囲に設けられ、該供給パイプの供給口及び前記鋳型の入口を誘導加熱する誘導加熱手段と、前記鋳型に設けられ、該鋳型を冷却し、前記誘導加熱手段の誘導加熱による該鋳型の入口の過熱を防ぐ冷却手段と、を備えることを特徴としている。 That is, the present invention is a glass rod manufacturing apparatus in which molten glass flowing down from a supply pipe is poured into an inlet at an upper end of a cylindrical mold, and a glass rod molded into a rod shape is drawn out from an outlet at the lower end of the mold,
An induction heating means provided around the supply pipe for induction heating the supply port of the supply pipe and the inlet of the mold; and the mold provided on the mold for cooling the mold and the induction heating means for induction heating. And cooling means for preventing overheating of the inlet of the mold.

また、本発明は、前記冷却手段が、前記鋳型の外周面に接触する冷却部材を備え、前記冷却部材の上端が前記鋳型の上端寄りに位置することを特徴としている。   Further, the present invention is characterized in that the cooling means includes a cooling member that contacts the outer peripheral surface of the mold, and the upper end of the cooling member is located closer to the upper end of the mold.

また、本発明は、前記鋳型の上端と前記冷却部材の上端との間隔（Ｄ）が、該鋳型の上端の肉厚（Ｔ）の半分よりも大きく、該鋳型の全長（Ｌ）の半分よりも小さいことを特徴としている。   In the present invention, the distance (D) between the upper end of the mold and the upper end of the cooling member is larger than half of the wall thickness (T) of the upper end of the mold, and more than half of the total length (L) of the mold. Is also small.

また、本発明は、供給パイプから流下する溶融ガラスを筒状の鋳型の上端の入口に流し込み、棒状に型成形したガラス棒を該鋳型の下端の出口から引き出すガラス棒の製造方法であって、
前記供給パイプの周囲に設けた誘導加熱手段により該供給パイプの供給口及び前記鋳型の入口を誘導加熱しながら、溶融ガラスを該鋳型の入口に流し込み、
前記鋳型に設けた冷却手段により該鋳型を冷却し、前記誘導加熱手段の誘導加熱による該鋳型の入口の過熱を防ぎながら、ガラス棒の型成形を行うことを特徴としている。 Further, the present invention is a method for producing a glass rod by pouring molten glass flowing down from a supply pipe into an inlet at the upper end of a cylindrical mold, and drawing out a glass rod molded into a rod shape from an outlet at the lower end of the mold,
While inductively heating the supply port of the supply pipe and the inlet of the mold by induction heating means provided around the supply pipe, the molten glass is poured into the inlet of the mold,
The mold is cooled while the mold is cooled by a cooling means provided in the mold, and overheating of the inlet of the mold due to induction heating of the induction heating means is performed.

本発明に係るガラス棒の製造装置と製造方法によれば、誘導加熱手段によって供給パイプの供給口を誘導加熱すると同時に、鋳型の上端の入口を誘導加熱することができるので、鋳型の入口に供給された溶融ガラスが、溶融ガラスと鋳型面と雰囲気との境界部で冷却されて失透が起きるのを未然に防ぐことができる。したがって、たとえ高屈折率の光学ガラス等のように粘度が低く失透し易いガラス材を用いた場合でも、失透を防いで高品質のガラス棒を製造することができる。   According to the manufacturing apparatus and the manufacturing method of the glass rod according to the present invention, the inlet of the upper end of the mold can be induction-heated at the same time as the supply port of the supply pipe is induction-heated by the induction heating means. It is possible to prevent the devitrification from occurring when the molten glass is cooled at the boundary between the molten glass, the mold surface and the atmosphere. Therefore, even when a glass material having a low viscosity and easily devitrifying like an optical glass having a high refractive index is used, devitrification can be prevented and a high quality glass rod can be manufactured.

しかも、冷却手段により鋳型の入口を冷却することができるので、誘導加熱手段の誘導加熱による鋳型の入口の過熱を防ぐことができる。したがって、加熱され過ぎた鋳型面にガラス皮膜が融着してガラス欠陥となる問題も未然に防ぐことができる。   In addition, since the inlet of the mold can be cooled by the cooling means, overheating of the inlet of the mold due to induction heating by the induction heating means can be prevented. Therefore, it is possible to prevent the problem that the glass film is fused to the mold surface that has been heated too much to cause glass defects.

また、誘導加熱手段によって供給パイプ及び鋳型の入口を同時に誘導加熱することができるので、装置構成を簡素化することができる。また、供給パイプの温度調節に応じて、鋳型の入口の温度調節を行うことができる。   In addition, since the supply pipe and the inlet of the mold can be induction-heated simultaneously by the induction heating means, the apparatus configuration can be simplified. Further, the temperature of the inlet of the mold can be adjusted according to the temperature adjustment of the supply pipe.

本実施形態のガラス棒の製造装置の要部縦断面図である。It is a principal part longitudinal cross-sectional view of the manufacturing apparatus of the glass rod of this embodiment. 本実施形態のガラス棒の製造装置の部分拡大縦断面図である。It is a partial expanded longitudinal cross-sectional view of the manufacturing apparatus of the glass rod of this embodiment.

本実施形態のガラス棒の製造装置１０は主として、図１に示すように、溶融ガラスＭを流下させる供給パイプ１と、供給パイプ１から流下した溶融ガラスＭを型成形する筒状の鋳型２と、供給パイプ１の周囲に設けられた誘導加熱手段３と、鋳型２に設けられた冷却手段４とを備えている。   As shown in FIG. 1, the glass rod manufacturing apparatus 10 of the present embodiment mainly includes a supply pipe 1 for flowing down the molten glass M, and a cylindrical mold 2 for molding the molten glass M flowing down from the supply pipe 1. The induction heating means 3 provided around the supply pipe 1 and the cooling means 4 provided on the mold 2 are provided.

供給パイプ１は、円筒状の白金パイプから成り、鉛直姿勢を保ってフレームに支持されている。供給パイプ１の上端側は、不図示のガラス溶融槽に接続され、溶融槽に貯留された溶融ガラスＭをパイプ下端の供給口１１から鉛直下方へ流下させる。また、供給パイプ１の供給口１１寄りには、熱電対から成る温度測定器１２が設けられている。   The supply pipe 1 is formed of a cylindrical platinum pipe and is supported by the frame while maintaining a vertical posture. The upper end side of the supply pipe 1 is connected to a glass melting tank (not shown), and the molten glass M stored in the melting tank is caused to flow down vertically from the supply port 11 at the lower end of the pipe. Further, a temperature measuring device 12 made of a thermocouple is provided near the supply port 11 of the supply pipe 1.

鋳型２は、円筒状の所謂カーボン型から成り、上記供給パイプ１の下方に、供給パイプ１と軸心を一致させ、鉛直姿勢を保って設けられている。鋳型２の上端２１１には、供給パイプ１から流下する溶融ガラスＭを鋳型内に流し込むための入口２１を有し、鋳型２の下端２２１には、鋳型内で型成形されたガラス棒Ｒを引き出すための出口２２を有している。また、鋳型２の上端２１１寄り、中程部、及び下端２２１寄りには、熱電対から成る温度測定器２３、２４、２５がそれぞれ差し込まれている。   The casting mold 2 is formed of a so-called carbon mold having a cylindrical shape, and is provided below the supply pipe 1 so that the axis of the supply pipe 1 coincides with the axis and maintains a vertical posture. An upper end 211 of the mold 2 has an inlet 21 for pouring molten glass M flowing down from the supply pipe 1 into the mold, and a glass rod R molded in the mold is pulled out at the lower end 221 of the mold 2. It has an outlet 22 for the purpose. Further, temperature measuring devices 23, 24, and 25 made of thermocouples are respectively inserted near the upper end 211, the middle portion, and the lower end 221 of the mold 2.

誘導加熱手段３は、円形螺旋状のコイル３１から成り、供給パイプ１の周囲に、供給パイプ１と軸心を一致させて配設されている。コイル３１には不図示の高周波電源が接続されており、コイル３１の内側に位置する供給パイプ１を誘導加熱すると同時に、コイル３１に近接する鋳型２の上端２１１を誘導加熱する。本実施形態では、図２に示すように、鋳型２の外径Ｄｍよりも大きい直径Ｄｃを有するコイル３１を配設しており、鋳型２の上端２１１をより効率的に加熱することができる。   The induction heating unit 3 includes a circular spiral coil 31 and is arranged around the supply pipe 1 so that the axis of the supply pipe 1 coincides with the axis. A high frequency power source (not shown) is connected to the coil 31, and the supply pipe 1 located inside the coil 31 is induction heated, and at the same time, the upper end 211 of the mold 2 adjacent to the coil 31 is induction heated. In the present embodiment, as shown in FIG. 2, the coil 31 having a diameter Dc larger than the outer diameter Dm of the mold 2 is provided, and the upper end 211 of the mold 2 can be heated more efficiently.

冷却手段４は、図１に示すように、上記鋳型２の外周面に接触して設けられたステンレス鋼から成る円筒状の冷却部材４１と、冷却部材４１の外周面を取り囲んで円環状の媒体流路Ｃを形成する周壁部材４２と、媒体流路Ｃに冷却媒体を流入出させるための流入管４３及び流出管４４とを備えている。この媒体流路Ｃに冷却水等の冷却媒体を流通させることによって、冷却部材４１を介して鋳型２の外周面を冷却する。このことで、冷却部材４１の接触部にほぼ対応する部位の型内面が冷却されると同時に、上記誘導加熱手段３により誘導加熱された鋳型２の上端２１１の入口２１が冷却される。   As shown in FIG. 1, the cooling means 4 includes a cylindrical cooling member 41 made of stainless steel provided in contact with the outer peripheral surface of the mold 2, and an annular medium surrounding the outer peripheral surface of the cooling member 41. A peripheral wall member 42 forming the flow path C, and an inflow pipe 43 and an outflow pipe 44 for allowing the cooling medium to flow into and out of the medium flow path C are provided. By circulating a cooling medium such as cooling water through the medium flow path C, the outer peripheral surface of the mold 2 is cooled via the cooling member 41. As a result, the inner surface of the mold substantially corresponding to the contact portion of the cooling member 41 is cooled, and at the same time, the inlet 21 of the upper end 211 of the mold 2 that is induction-heated by the induction heating means 3 is cooled.

図２に示すように、冷却部材４１の上端４１１は、鋳型２の上端２１１寄りに位置している。即ち、本実施形態では、鋳型２の上端２１１と冷却部材４１の上端４１１との間に間隔Ｄを設け、この間隔Ｄを、鋳型２の上端２１１の肉厚Ｔに対して０．９Ｔとしている（Ｄ／Ｔ＝０．９）。   As shown in FIG. 2, the upper end 411 of the cooling member 41 is located closer to the upper end 211 of the mold 2. That is, in this embodiment, a gap D is provided between the upper end 211 of the mold 2 and the upper end 411 of the cooling member 41, and this gap D is set to 0.9 T with respect to the thickness T of the upper end 211 of the mold 2. (D / T = 0.9).

この間隔Ｄは、棒状成形すべきガラス材の材質等を考慮して適宜変更することができ、上端２１１の肉厚Ｔの半分（０．５Ｔ）より大きく、鋳型２の全長Ｌの半分（０．５Ｌ）より小さいことが好ましい（０．５Ｔ＜Ｄ＜０．５Ｌ）。間隔Ｄが、０．５Ｔ以下であると、誘導加熱手段３による冷却手段４自体の加熱が大きくなり、その冷却能力が損なわれる。他方、間隔Ｄが０．５Ｌ以上であると、冷却手段４による鋳型２の入口２１の冷却効果が不十分となる。また、間隔Ｄは、０．７Ｔよりも大きく、３．０Ｔよりも小さいことが更に好ましい（０．７Ｔ＜Ｄ＜３．０Ｔ）。   This distance D can be appropriately changed in consideration of the material of the glass material to be formed into a rod shape, and is larger than half the thickness T (0.5 T) of the upper end 211 and half the total length L of the mold 2 (0 .5L) is preferred (0.5T <D <0.5L). When the interval D is 0.5 T or less, the heating of the cooling unit 4 itself by the induction heating unit 3 is increased, and the cooling capacity is impaired. On the other hand, when the distance D is 0.5 L or more, the cooling effect of the inlet 21 of the mold 2 by the cooling means 4 becomes insufficient. Further, the distance D is more preferably larger than 0.7T and smaller than 3.0T (0.7T <D <3.0T).

また、冷却部材４１の下端４１２は、鋳型２の中央寄りに位置している。冷却部材４１の下端４１２の位置は、例えば鋳型内における溶融ガラスＭの冷却速度やガラス材の材質等を考慮して適宜変更することができる。必要に応じて冷却部材４１の下端４１２を鋳型２の下端２２１と一致させてもよい。さらに、図１に示すように、鋳型２の外周面の中央部から下端２２１にかけて断熱材５を配設してもよい。   Further, the lower end 412 of the cooling member 41 is located closer to the center of the mold 2. The position of the lower end 412 of the cooling member 41 can be changed as appropriate in consideration of the cooling rate of the molten glass M in the mold, the material of the glass material, and the like. You may make the lower end 412 of the cooling member 41 correspond with the lower end 221 of the casting_mold | template 2 as needed. Furthermore, as shown in FIG. 1, the heat insulating material 5 may be disposed from the center of the outer peripheral surface of the mold 2 to the lower end 221.

次に、本実施形態のガラス棒の製造装置１０を適用したガラス棒の製造方法について説明する。   Next, a glass rod manufacturing method to which the glass rod manufacturing apparatus 10 of the present embodiment is applied will be described.

溶融ガラスＭを型成形するにあたり、誘導加熱手段３のコイル３１に高周波電流を流し、供給パイプ１を誘導加熱すると同時に、鋳型２の上端２１１を誘導加熱する。そして、冷却手段４の媒体流路Ｃに冷却媒体を流通させ、鋳型２の型内面を冷却すると同時に、鋳型２の上端２１１の入口２１を冷却する。この状態で、供給パイプ１から溶融ガラスＭを流下させ、鋳型２の入口２１に流し込む。そして、鋳型２の型内面で溶融ガラスＭを冷却しながら棒状に型成形し、型成形したガラス棒Ｒを鋳型２の出口２２から引き出す。こうして、ガラス棒Ｒが連続的に製造される。   In molding the molten glass M, a high-frequency current is passed through the coil 31 of the induction heating means 3 to inductively heat the supply pipe 1 and simultaneously heat the upper end 211 of the mold 2. Then, the cooling medium is circulated through the medium flow path C of the cooling unit 4 to cool the mold inner surface of the mold 2 and simultaneously cool the inlet 21 at the upper end 211 of the mold 2. In this state, the molten glass M flows down from the supply pipe 1 and flows into the inlet 21 of the mold 2. Then, the molten glass M is molded into a rod shape while cooling the molten glass M on the inner surface of the mold 2, and the molded glass rod R is pulled out from the outlet 22 of the mold 2. In this way, the glass rod R is continuously manufactured.

このように本実施形態のガラス棒の製造装置１０とその製造方法によれば、誘導加熱手段３によって供給パイプ１の供給口１１を誘導加熱すると同時に、鋳型２の上端２１１の入口２１を誘導加熱することができるので、図２に示すように、鋳型２の入口２１に供給された溶融ガラスＭが、溶融ガラスと鋳型面と雰囲気との境界部Ａ（以下、単に境界部という。）で冷却されて失透が起きるのを未然に防ぐことができる。したがって、たとえ高屈折率の光学ガラス等のように粘度が低く失透し易いガラス材を用いた場合でも、失透を防いで高品質のガラス棒を製造することができる。   As described above, according to the glass rod manufacturing apparatus 10 and the manufacturing method thereof according to the present embodiment, the inlet 21 of the supply pipe 1 is induction-heated by the induction heating means 3 and at the same time the inlet 21 of the upper end 211 of the mold 2 is induction-heated. Therefore, as shown in FIG. 2, the molten glass M supplied to the inlet 21 of the mold 2 is cooled at a boundary portion A (hereinafter simply referred to as a boundary portion) between the molten glass, the mold surface, and the atmosphere. It is possible to prevent devitrification from occurring. Therefore, even when a glass material having a low viscosity and easily devitrifying like an optical glass having a high refractive index is used, devitrification can be prevented and a high quality glass rod can be manufactured.

しかも、本実施形態のガラス棒の製造装置１０とその製造方法によれば、冷却手段４により鋳型２の型内面を冷却すると同時に、鋳型２の入口２１を冷却することができるので、誘導加熱手段３の誘導加熱による鋳型２の入口２１の過熱を防ぐことができる。したがって、境界部Ａにおいて、加熱され過ぎた鋳型面にガラス皮膜が融着してガラス欠陥となる問題も未然に防ぐことができる。   Moreover, according to the glass rod manufacturing apparatus 10 and the manufacturing method thereof of the present embodiment, the inlet 21 of the mold 2 can be cooled at the same time as the mold inner surface of the mold 2 is cooled by the cooling means 4. The overheating of the inlet 21 of the mold 2 due to the induction heating of 3 can be prevented. Therefore, the problem that the glass film is fused to the heated mold surface at the boundary portion A to cause a glass defect can be prevented.

さらに、冷却手段４により境界部Ａの直下で鋳型２の型内面を冷却することができるので、鋳型２内で溶融ガラスＭを急冷することができ、このことによっても、溶融ガラスの失透を防いで高品質のガラス棒を製造することができる。   Furthermore, since the mold inner surface of the mold 2 can be cooled just below the boundary portion A by the cooling means 4, the molten glass M can be rapidly cooled in the mold 2, and this also prevents devitrification of the molten glass. High quality glass rods can be produced with protection.

また、誘導加熱手段３によって同時に供給パイプ１及び鋳型２の入口２１を誘導加熱することができるので、装置構成を簡素化することができる。また、供給パイプ１の温度調節に応じて、鋳型２の入口２１の温度調節を行うことができる。   In addition, since the induction pipe 3 and the inlet 21 of the mold 2 can be induction-heated simultaneously by the induction heating means 3, the apparatus configuration can be simplified. Further, the temperature of the inlet 21 of the mold 2 can be adjusted according to the temperature adjustment of the supply pipe 1.

以上、本実施形態のガラス棒の製造装置とその製造方法について説明したが、本発明は他の実施形態でも実施することができる。   The glass rod manufacturing apparatus and the manufacturing method thereof according to the present embodiment have been described above, but the present invention can also be implemented in other embodiments.

例えば、上記実施形態では、冷却手段４として、冷却部材４１の周囲に周壁部材４２を設けて媒体流路Ｃを形成し、この媒体流路Ｃに冷却水を流通させているが、冷却水の代わりに他の液体や気体を冷却媒体として流通させてもよい。また、鋳型２の外周面に直接、或いは、冷却部材を介して間接的に気体を吹き付けることにより鋳型２の入口２１を冷却してもよい。   For example, in the above embodiment, as the cooling means 4, the peripheral wall member 42 is provided around the cooling member 41 to form the medium flow path C, and the cooling water is circulated through the medium flow path C. Instead, another liquid or gas may be circulated as a cooling medium. Moreover, you may cool the inlet 21 of the casting_mold | template 2 by spraying gas directly on the outer peripheral surface of the casting_mold | template 2 or indirectly via a cooling member.

また、冷却手段４は、誘導加熱手段３の誘導加熱による鋳型２の入口２１の過熱を防ぐことができれば足り、必ずしも同時に鋳型２の入口２１以外の部分を冷却することができる必要はない。鋳型２の入口２１の過熱を防ぐ冷却手段とは別に、鋳型２の型内面を冷却する他の冷却手段を設けるようにしてもよい。   In addition, the cooling unit 4 only needs to prevent overheating of the inlet 21 of the mold 2 due to induction heating of the induction heating unit 3, and does not necessarily need to be able to cool portions other than the inlet 21 of the mold 2 at the same time. Apart from the cooling means for preventing overheating of the inlet 21 of the mold 2, other cooling means for cooling the mold inner surface of the mold 2 may be provided.

また、本発明はその趣旨を逸脱しない範囲内で、当業者の知識に基づいて種々の改良、修正、変形を加えた態様で実施し得る。同一の作用又は効果が生じる範囲内でいずれかの発明特定事項を他の技術に置換した形態で実施しても良く、また、一体に構成されている発明特定事項を複数の部材から構成したり、複数の部材から構成されている発明特定事項を一体に構成した形態で実施しても良い。   In addition, the present invention can be carried out in a mode in which various improvements, modifications and variations are added based on the knowledge of those skilled in the art without departing from the spirit of the present invention. It may be implemented in a form in which any invention specific matter is replaced with another technology within a range where the same action or effect occurs, or the invention specific matter configured integrally may be constituted by a plurality of members. In addition, the invention specific items constituted by a plurality of members may be implemented in an integrated configuration.

以下の条件で溶融ガラスからガラス棒を製造した。   A glass rod was produced from molten glass under the following conditions.

供給パイプ１；外径５ｍｍ、内径３ｍｍ
鋳型２；外径４０ｍｍ、内径２０ｍｍ、肉厚（Ｔ）１０ｍｍ、全長（Ｌ）１０５ｍｍ
供給パイプ１の下端と鋳型２の上端２１１との鉛直間隔３ｍｍ
誘導加熱手段３のコイル３１；線径６ｍｍ、直径（Ｄｃ）５４ｍｍ
コイル３１の下端と供給パイプ１の下端との鉛直間隔０ｍｍ
冷却手段４の冷却部材４１；全長５０ｍｍ
冷却部材４１の上端４１１と鋳型２の上端２１１との鉛直間隔（Ｄ）９ｍｍ Supply pipe 1; outer diameter 5 mm, inner diameter 3 mm
Mold 2; outer diameter 40 mm, inner diameter 20 mm, wall thickness (T) 10 mm, full length (L) 105 mm
3 mm vertical distance between the lower end of the supply pipe 1 and the upper end 211 of the mold 2
Coil 31 of induction heating means 3; wire diameter 6 mm, diameter (Dc) 54 mm
Vertical distance 0 mm between the lower end of the coil 31 and the lower end of the supply pipe 1
Cooling member 41 of cooling means 4; total length 50 mm
Vertical distance (D) 9 mm between the upper end 411 of the cooling member 41 and the upper end 211 of the mold 2

上記条件のガラス棒の製造装置１０の供給パイプ１から、低粘性ガラス材の溶融ガラスＭを流下させ、鋳型２の入口２１に流し込んだ。溶融ガラスＭの流量は３０７６ｇ／ｈ、供給パイプ１の温度は１１８０℃、鋳型２の温度は４４０℃（上端２１１寄り）、２９２℃（中程部）、２９４℃（下端２２１寄り）であった。そして、ガラス棒Ｒを鋳型２の出口２２から、引出し速度０．５３ｍｍ／ｓで引き出した。こうして得られたガラス棒Ｒをアニール処理し、分割し、研磨後、目視観察したところ失透や脈理等の欠陥は認められなかった。   The molten glass M, which is a low-viscosity glass material, was caused to flow down from the supply pipe 1 of the glass rod manufacturing apparatus 10 under the above conditions, and then was poured into the inlet 21 of the mold 2. The flow rate of the molten glass M was 3076 g / h, the temperature of the supply pipe 1 was 1180 ° C., and the temperature of the mold 2 was 440 ° C. (close to the upper end 211), 292 ° C. (middle part), and 294 ° C. (close to the lower end 221). . Then, the glass rod R was drawn out from the outlet 22 of the mold 2 at a drawing speed of 0.53 mm / s. The glass rod R thus obtained was annealed, divided, polished, and visually observed. No defects such as devitrification and striae were observed.

１０ ガラス棒の製造装置
１ 供給パイプ
１１ 供給口
２ 鋳型
２１ 入口
２２ 出口
２１１（鋳型の）上端
２２１（鋳型の）下端
３ 誘導加熱手段
４ 冷却手段
４１ 冷却部材
４１１（冷却部材の）上端
４１２（冷却部材の）下端
Ｍ 溶融ガラス
Ｒ ガラス棒
Ｄ 鋳型の上端と冷却部材の上端との間隔
Ｔ 鋳型の上端の肉厚
Ｌ 鋳型の全長 DESCRIPTION OF SYMBOLS 10 Glass rod manufacturing apparatus 1 Supply pipe 11 Supply port 2 Mold 21 Inlet 22 Outlet 211 (Mold) upper end 221 (Mold) lower end 3 Induction heating means 4 Cooling means 41 Cooling member 411 (cooling member) upper end 412 (cooling) Lower end M of the member Molten glass R Glass rod D Distance between the upper end of the mold and the upper end of the cooling member T Wall thickness L at the upper end of the mold L

Claims (4)

供給パイプから流下する溶融ガラスを筒状の鋳型の上端の入口に流し込み、棒状に型成形したガラス棒を該鋳型の下端の出口から引き出すガラス棒の製造装置であって、
前記供給パイプの周囲に設けられ、該供給パイプの供給口及び前記鋳型の入口を誘導加熱する誘導加熱手段と、
前記鋳型に設けられ、該鋳型を冷却し、前記誘導加熱手段の誘導加熱による該鋳型の入口の過熱を防ぐ冷却手段と、
を備えることを特徴としたガラス棒の製造装置。 A glass rod manufacturing apparatus for pouring molten glass flowing down from a supply pipe into an inlet at the upper end of a cylindrical mold and drawing out a glass rod molded into a rod shape from an outlet at the lower end of the mold,
An induction heating means provided around the supply pipe for induction heating the supply port of the supply pipe and the inlet of the mold;
A cooling means provided on the mold for cooling the mold and preventing overheating of the inlet of the mold due to induction heating of the induction heating means;
An apparatus for producing a glass rod, comprising: 前記冷却手段が、前記鋳型の外周面に接触する冷却部材を備え、
前記冷却部材の上端が前記鋳型の上端寄りに位置することを特徴とした請求項１記載のガラス棒の製造装置。 The cooling means includes a cooling member that contacts the outer peripheral surface of the mold,
The apparatus for producing a glass rod according to claim 1, wherein an upper end of the cooling member is positioned closer to an upper end of the mold. 前記鋳型の上端と前記冷却部材の上端との間隔（Ｄ）が、該鋳型の上端の肉厚（Ｔ）の半分よりも大きく、該鋳型の全長（Ｌ）の半分よりも小さいことを特徴とした請求項２記載のガラス棒の製造装置。   The distance (D) between the upper end of the mold and the upper end of the cooling member is larger than half of the thickness (T) of the upper end of the mold and smaller than half of the total length (L) of the mold. The apparatus for manufacturing a glass rod according to claim 2. 供給パイプから流下する溶融ガラスを筒状の鋳型の上端の入口に流し込み、棒状に型成形したガラス棒を該鋳型の下端の出口から引き出すガラス棒の製造方法であって、
前記供給パイプの周囲に設けた誘導加熱手段により該供給パイプの供給口及び前記鋳型の入口を誘導加熱しながら、溶融ガラスを該鋳型の入口に流し込み、
前記鋳型に設けた冷却手段により該鋳型を冷却し、前記誘導加熱手段の誘導加熱による該鋳型の入口の過熱を防ぎながら、ガラス棒の型成形を行うことを特徴としたガラス棒の製造方法。 A molten glass flowing down from a supply pipe is poured into an inlet at the upper end of a cylindrical mold, and a glass rod produced in a rod shape is drawn out from an outlet at the lower end of the mold.
While inductively heating the supply port of the supply pipe and the inlet of the mold by induction heating means provided around the supply pipe, the molten glass is poured into the inlet of the mold,
A method for producing a glass rod, comprising: cooling the mold by a cooling means provided on the mold, and molding the glass rod while preventing overheating of the inlet of the mold due to induction heating by the induction heating means.
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