JP2009173464A - Method for producing glass molded body - Google Patents
Method for producing glass molded body Download PDFInfo
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- JP2009173464A JP2009173464A JP2008010819A JP2008010819A JP2009173464A JP 2009173464 A JP2009173464 A JP 2009173464A JP 2008010819 A JP2008010819 A JP 2008010819A JP 2008010819 A JP2008010819 A JP 2008010819A JP 2009173464 A JP2009173464 A JP 2009173464A
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Abstract
Description
本発明は、高い形状精度が要求されるガラス成形体をその形状に相応するキャビティーを有する成形型を用いて熱間成形により製造する方法に関する。特に小口径で径に比較して厚さの大きなロッドに近い形状を持つレンズのモールド成形に適したガラス成形体及びその製造方法に関するものである。通常の熱間成形法では困難な不規則な形状、特に芯とり加工作業を不要とする高精度な小口径で厚みのあるレンズを製造する分野。 The present invention relates to a method for producing a glass molded body requiring high shape accuracy by hot forming using a mold having a cavity corresponding to the shape. In particular, the present invention relates to a glass molded body suitable for molding of a lens having a small diameter and a shape close to a rod having a thickness larger than the diameter, and a method for manufacturing the same. The field of manufacturing lenses with irregular shapes that are difficult to achieve with normal hot forming methods, especially high-precision small-diameter and thick lenses that do not require centering.
ガラスは熱間成形が可能なため、型を使用して加熱して所望の形状のレンズ等を成形する方法が様々提案されている。最近、型の表面を高精度な鏡面に加工して熱間成形をして直接レンズを製造する方法等も実用化されている。この方法は研削、研磨という加工工程を省略できるため、コスト低減につながるばかりでなく、非球面レンズなども容易に製造できるため、それらレンズを用いることによりレンズ枚数を大幅に削減でき、カメラ等の小型化に大いに貢献している。 Since glass can be hot-molded, various methods have been proposed for molding a lens having a desired shape by heating using a mold. Recently, a method of directly manufacturing a lens by processing a surface of a mold into a highly accurate mirror surface and performing hot molding has been put into practical use. Since this method can eliminate processing steps such as grinding and polishing, it not only leads to cost reduction, but also aspherical lenses can be easily manufactured. By using these lenses, the number of lenses can be greatly reduced. Contributes greatly to miniaturization.
通常の熱間成形法では困難な不規則な形状をもつガラス成形体を製造する技術は既に特開2001−48555で提案されている。しかし、ここで開示されている技術は小型でアスペクト比が大きく薄板状の光ファイバー固定部材のような位置決め部材など、不規則な形状を有するガラス成形体を得るのを目的としており、何より高い重量精度が要求されるガラス成形体の製造に関するものである。一方本発明の目的は芯とり加工作業を不要とする高精度な小口径で厚みのあるレンズを製造する方法の提供することにあり、要求される精度は重量精度ではなく、形状精度である点大きな違いがある。 Japanese Patent Laid-Open No. 2001-48555 has already proposed a technique for producing a glass molded body having an irregular shape that is difficult to obtain by a normal hot forming method. However, the technique disclosed here is aimed at obtaining a glass molded body having an irregular shape such as a positioning member such as a thin optical fiber fixing member having a small aspect ratio and a large aspect ratio. The present invention relates to the production of a glass molded body that is required. On the other hand, an object of the present invention is to provide a method of manufacturing a lens having a small diameter and a thickness that does not require a centering process, and the required accuracy is not a weight accuracy but a shape accuracy. There is a big difference.
以上のように本発明が解決しようとする課題は第一には通常の熱間成形法では困難な不規則な形状特に芯とり加工作業を不要とする高精度な小口径で厚みのあるレンズを製造する方法の提供することにある。一般に小口径で厚みのあるレンズ(φ1前後)の様なガラス成形体の芯取り作業は、技術的に困難な工程を伴い加工単価の上昇を招く。例えばこのようなガラス成形体に芯取り作業による砥石押圧作業は、ガラス成形体の崩壊を生じやすい。小口径のレンズ(φ1前後)芯取り作業は、技術的取り作業等の二次加工を排することが重要である。 As described above, the problem to be solved by the present invention is, first of all, an irregular shape that is difficult to obtain by a normal hot forming method, in particular, a high-precision small-diameter and thick lens that does not require a centering process. It is to provide a method of manufacturing. In general, the centering operation of a glass molded body such as a lens having a small diameter and a thick lens (around φ1) involves technically difficult processes and increases the processing cost. For example, a grindstone pressing operation by a centering operation on such a glass molded body tends to cause the glass molded body to collapse. It is important that the centering work of the small-diameter lens (around φ1) eliminates secondary processing such as technical work.
ところで、厚みのある小口径レンズのようなガラス成形体を熱間型成形しようとすると極めて困難なことになる。ガラスを熱間加工する場合通常、ガラスの型への融着を防止するため、型の温度をガラス転移温度以下に設定するのが一般であるが、特に成形品が小型の場合、型と接触するために急激に冷却され、ガラスが変形する前に固化してしまうのである。形状によっては成形前のガラス材を型に挿入することすら困難となる。 By the way, it is extremely difficult to hot mold a glass molded body such as a thick small-diameter lens. When hot working glass, it is common to set the mold temperature below the glass transition temperature in order to prevent the glass from fusing to the mold, but especially when the molded product is small, contact the mold. In order to do so, it is cooled rapidly and solidifies before the glass is deformed. Depending on the shape, it becomes difficult to insert the glass material before molding into the mold.
少なくとも下型及び上型からなる成形型を用いて二つ以上のガラス素材を前記下型の成形面上に配置し、前記ガラス素材及び少なくとも下型を、ガラス素材のプレス成形可能な温度にまで加熱し、加熱されたガラス素材を前記成形型によりプレス成形することにより、前記ガラスを変形させて接合一体化して所定形状のガラス成形体を製造する方法において、非融着部分の空隙の容積を調整して高精度の形状を有するガラス成形体を得る。
課題を解決するための手段としては少なくとも下型及び上型からなる成形型を用いて二つ以上のガラス素材を前記下型の成形面上に配置し、前記ガラス素材及び少なくとも下型を、ガラス素材のプレス成形可能な温度にまで加熱し、加熱されたガラス素材を前記成形型によりプレス成形することにより、前記ガラスを変形させて接合一体化して所定形状のガラス成形体を製造する方法において、非融着部分の空隙の容積を調整して高精度の形状を有するガラス成形体を得ることを特徴とするガラス成形体の製造方法である。
ガラス素材が多めに型に挿入された場合には素材間に生じた空隙の容積を減ずることにより、形状寸法を正確に一定に保つことが可能となる。
Two or more glass materials are arranged on the molding surface of the lower mold using a mold composed of at least a lower mold and an upper mold, and the glass material and at least the lower mold are brought to a temperature at which the glass material can be press-molded. In the method of manufacturing a glass molded body having a predetermined shape by deforming and integrating the glass by press-molding the heated glass material with the molding die, A glass molded body having a highly accurate shape is obtained by adjusting.
As means for solving the problem, at least two glass materials are arranged on the molding surface of the lower mold using a molding die composed of at least a lower mold and an upper mold, and the glass material and at least the lower mold are made of glass. In a method for producing a glass molded body of a predetermined shape by heating up to a temperature at which the material can be press-molded, press-molding the heated glass material with the molding die, deforming and integrating the glass, It is a method for producing a glass molded body characterized in that a glass molded body having a highly accurate shape is obtained by adjusting the volume of the voids in the non-fused portion.
When a large amount of glass material is inserted into the mold, it is possible to keep the shape and dimensions accurately constant by reducing the volume of the gap generated between the materials.
本発明によれば、熱間成形法により小口径のレンズ(例えばφ1前後)を容易に得ることが出来るので、芯取り作業を省くことができ、技術的に困難な工程に伴って生ずる加工単価の上昇を避けることが可能となる。
ガラス成形体に芯取り作業による砥石押圧作業は、ガラス成形体の崩壊を生じやすい。小口径のレンズ(φ1前後)芯取り作業は、技術的取り作業等の二次加工を排することが重要であるがこれを可能とすることができる。
According to the present invention, a small-diameter lens (for example, around φ1) can be easily obtained by the hot molding method, so that the centering work can be omitted and the unit cost of processing caused by technically difficult processes. It is possible to avoid the rise of.
The grindstone pressing operation by the centering operation on the glass molded body tends to cause the glass molded body to collapse. The centering operation of the small-diameter lens (around φ1) is important to eliminate the secondary processing such as the technical centering operation.
本発明の実施の形態の一つとして上記の製造方法にける非融着部分の空隙を調整する手段としてはガラス素材の総容積を型のキャビティの容積よりも少なくすることを特徴とするガラス成形体の製造方法である。ガラス素材の総容積を型の押圧後の型のキャビティの容積よりも少なくすることにより、上記の空隙を確実に作ることが可能となる。 As one of the embodiments of the present invention, as a means for adjusting the gap of the non-fused portion in the above manufacturing method, the glass molding is characterized in that the total volume of the glass material is made smaller than the volume of the mold cavity. It is a manufacturing method of a body. By making the total volume of the glass material smaller than the volume of the cavity of the mold after the mold is pressed, the above-described gap can be surely formed.
本発明の実施の形態の他の一つとしては上記非融着部分の空隙の容積を調整する手段として上型と下型の少なくとも一方にストッパーを設けることで、プレス中に所定の位置で上下型を固定させることにより可能となる。すなわち、押圧後の上下型の位置を正確に決めることにより、寸法精度の高いガラス成形体を得ることが可能となる。そしてガラス素材の総容積を型の押圧後の型のキャビティの容積よりも少なくされているため、余分なガラスが型より溢れ出すということがない。 In another embodiment of the present invention, a stopper is provided on at least one of the upper die and the lower die as a means for adjusting the volume of the gap in the non-fused portion, so that the upper and lower portions are fixed at predetermined positions during pressing. This is possible by fixing the mold. That is, it becomes possible to obtain a glass molded body with high dimensional accuracy by accurately determining the positions of the upper and lower molds after pressing. And since the total volume of the glass material is made smaller than the volume of the cavity of the mold after the mold is pressed, excess glass does not overflow from the mold.
以下、本発明について実施例に基づき説明する。本実施例は、成形体が光通信用のロッドレンズとなる成形体の成形例である。図1は一般的な通信用ロッドレンズの形状10の斜視図で、レンズ面11を有する。図2は本発明により成形された場合の斜視図で、ガラス素材4を3個使用したものである。
Hereinafter, the present invention will be described based on examples. The present example is a molding example of a molded body in which the molded body becomes a rod lens for optical communication. FIG. 1 is a perspective view of a
実施例で使用したガラス素材は溶融ガラスを滴下して得られる滴下ガラス球を使用した。ガラス球の半径は1.25mmである。ここで、3個使用した場合の総体積は3.066mm3であり、このとき、ストッパー6により上下型が固定されたときのキャビティーの容積を3.189mm3とした。
The glass material used in the examples was a dropping glass sphere obtained by dropping molten glass. The radius of the glass sphere is 1.25 mm. Here, the total volume when three pieces are used is 3.066
図3に成形体を製作する場合の金型およびその構成を示す縦断面図である。図中胴型1に下型2が挿入され、内部に成形体材料4を挿入する空間(キャビティー)と、上型3を上部から挿入する構造となる。図4はキャビティ空間(5)部の詳細な縦断面図であり、ガラス素材4を3個セットした状態を示す。
FIG. 3 is a longitudinal sectional view showing a mold and its configuration when producing a molded body in FIG. 3. In the figure, a
図5はストッパーにより成形体を製作する場合を説明するためのガラス素材を3個入れた場合の金型全体の縦断面図で、図6はストッパ6の平面図と縦断面図を示す。
FIG. 5 is a longitudinal sectional view of the entire mold when three glass materials are put in order to explain a case where a molded body is manufactured by a stopper, and FIG. 6 shows a plan view and a longitudinal sectional view of the
次に成形体の具体的な成形方法を、図5を用いて説明する。成形は図5の状態において、成形シロ7(図中の幅u)を、図8に示す成形条件下でガラス素材を過熱し、上部より成形シロ7をゼロの状態まで加圧する。
Next, a specific molding method of the molded body will be described with reference to FIG. In the state of FIG. 5, the molding material 7 (width u in the figure) is heated by heating the glass material under the molding conditions shown in FIG. 8, and the
図7はストッパー6の厚み(図中の幅t)まで加圧により上型3の移動した成形完了時の金型の状態を示す縦断面図である。
FIG. 7 is a longitudinal sectional view showing a state of the mold at the time of completion of molding in which the
SiO2を20wt%、B2O3を30wt%、Li20を10wt%、TiO2を10wt%、その他成分を30wt%含有するガラスを550℃、成形圧力40kgfをにて成形した結果、直径1.25mm厚さ2.6mmの成形体を得た。この成形体の加工精度はストッパー構造により±1μm以下、外周方向でも一律±1μm以下と極めて高精度な成形体を得られた。 As a result of molding glass containing 20 wt% SiO2, 30 wt% B2 O3, 10 wt% Li2O, 10 wt% TiO2 and 30 wt% other components at 550 ° C. and a molding pressure of 40 kgf, the diameter is 1.25 mm. A 6 mm shaped body was obtained. The processing accuracy of this molded body was ± 1 μm or less due to the stopper structure, and an extremely high precision molded body was obtained, which was uniformly ± 1 μm or less even in the outer circumferential direction.
1・・・胴型
2・・・上型
3・・・下型
4・・・ガラス素材
5・・・キャビティ
6・・・ストッパー
7・・・調整部
DESCRIPTION OF
Claims (3)
2. The apparatus according to claim 1, wherein a stopper is provided on at least one of the upper mold and the lower mold as means for adjusting the gap of the non-fused portion in claim 1, and the upper and lower molds are fixed at predetermined positions during pressing. A method for producing a glass molded body.
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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US9901711B2 (en) | 2011-02-16 | 2018-02-27 | Siemens Medical Solutions Usa, Inc. | Shape-controllable catheters and catheter system |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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US9901711B2 (en) | 2011-02-16 | 2018-02-27 | Siemens Medical Solutions Usa, Inc. | Shape-controllable catheters and catheter system |
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