JP2003104743A - Apparatus for forming glass element - Google Patents
Apparatus for forming glass elementInfo
- Publication number
- JP2003104743A JP2003104743A JP2001298086A JP2001298086A JP2003104743A JP 2003104743 A JP2003104743 A JP 2003104743A JP 2001298086 A JP2001298086 A JP 2001298086A JP 2001298086 A JP2001298086 A JP 2001298086A JP 2003104743 A JP2003104743 A JP 2003104743A
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- JP
- Japan
- Prior art keywords
- heat insulating
- glass
- heat
- insulating cylinder
- mold
- 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.)
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、特に断熱筒と軸の
断熱性を改良したガラス素子の成形装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a glass element molding apparatus in which the heat insulating properties of a heat insulating cylinder and a shaft are improved.
【０００２】[0002]
【従来の技術】ガラスレンズなどの高精度が要求される
ガラス素子の製造方法としては、研削・研磨により製造
されるものと、リヒートプレスにより製造されるものの
二種類に大別される。2. Description of the Related Art Methods for manufacturing glass elements such as glass lenses, which require high precision, are roughly classified into two types: those manufactured by grinding / polishing and those manufactured by reheat pressing.
【０００３】一般に光学ガラス素子の製造方法としてガ
ラス素材を研削・研磨して光学面を形成する方法が多く
用いられる。しかし、研削・研磨による曲面形成には十
数工程が必要であるうえに、作業者に有害なガラス研削
粉が多量に発生する問題点、さらに、研削・研磨では、
付加価値の高い非球面形状の光学面を持つガラスレンズ
を同じ精度で大量に製作することが困難であるという問
題点を持っている。Generally, as a method of manufacturing an optical glass element, a method of grinding and polishing a glass material to form an optical surface is often used. However, in addition to requiring more than ten steps to form a curved surface by grinding and polishing, there is the problem that a large amount of glass grinding powder, which is harmful to the operator, is generated.
There is a problem that it is difficult to manufacture a large number of glass lenses having an aspherical optical surface with high added value with the same accuracy.
【０００４】それに対してリヒートプレスは、溶融した
ガラスを一度冷却して製作したガラス素材を加熱し、プ
レスすることにより型の形状をガラス素材に転写させ、
ガラスレンズなどのガラス素子を成形する方法であり、
曲面形成に必要な工程はプレス成形の一工程のみである
という利点がある。また、型を一度製作すれば、型の精
度に準じた成形品がいくつも製作することも可能であ
る。On the other hand, in the reheat press, the glass material produced by cooling the molten glass once is heated and pressed to transfer the shape of the mold to the glass material,
It is a method of molding glass elements such as glass lenses,
There is an advantage that the step required for forming the curved surface is only one step of press molding. Further, once the mold is manufactured, it is possible to manufacture many molded products according to the precision of the mold.
【０００５】[0005]
【発明が解決しようとする課題】近年、光通信分野や医
療分野で、ガラス素子は非常に注目されている。中で
も、熱膨張が少ない、不純物が少ない、紫外線透過率が
良い等の理由から、石英ガラス素子が注目されている。
そのためガラス素子は、マイクロレンズアレイ等形状の
複雑なもの、また、大きさも超小型のものから大型のも
のまで各種必要となってくる。In recent years, glass elements have received a great deal of attention in the fields of optical communication and medical care. Above all, a silica glass element has been attracting attention because of its small thermal expansion, few impurities, and good ultraviolet transmittance.
Therefore, various glass elements such as a microlens array having a complicated shape and various sizes from an ultra-small size to a large size are required.
【０００６】上述したリヒートプレスでは、型の間にガ
ラス素材を置き、型の酸化を防止する目的で型およびガ
ラス素材を含む成形室内を不活性ガス雰囲気もしくは真
空雰囲気にしたうえで、高周波加熱装置や赤外線ランプ
等により加熱し、ガラス素材を型によりプレスした後、
成形品を冷却して取り出す方法が取られる。通常の光学
ガラスを成形する場合は、成形温度が高くても約７００
℃であり、断熱筒は熱伝導率の低いセラミックス製が用
いられてきた。しかし、石英ガラスのように成形温度が
約１４００℃と高いガラス素材では、ガラス素材を加熱
させる際に、型と一緒に断熱筒が加熱されてしまい、断
熱筒の耐久性が低下もしくは断熱筒が破損する問題があ
った。そこで、本発明は石英ガラスのような成形温度が
高いガラス素子をリヒートプレスにより成形する際に、
断熱筒の耐久性の向上に関する問題を解決する、ガラス
素子成形装置を提供することにある。In the above-described reheat press, a glass material is placed between the molds, the molding chamber containing the mold and the glass material is placed in an inert gas atmosphere or a vacuum atmosphere for the purpose of preventing the mold from being oxidized, and then a high frequency heating device is used. After heating with an infrared lamp or the like and pressing the glass material with a mold,
A method of cooling the molded product and taking it out is adopted. When molding ordinary optical glass, even if the molding temperature is high, about 700
C., and the heat insulating cylinder has been made of ceramics having low thermal conductivity. However, with a glass material having a high molding temperature of about 1400 ° C. such as quartz glass, when the glass material is heated, the heat insulating cylinder is heated together with the mold, which lowers the durability of the heat insulating cylinder or There was a problem of breakage. Therefore, the present invention, when molding a glass element having a high molding temperature such as quartz glass by a reheat press,
It is an object of the present invention to provide a glass element molding apparatus that solves the problem of improving the durability of the heat insulating cylinder.
【０００７】[0007]
【課題を解決するための手段】この発明は上記課題を解
決するためのもので、以下の構成を備えている。The present invention is intended to solve the above problems and has the following constitution.
【０００８】（１） 加熱されるガラス素材が配置され
る一対の型組立てと、これら一対の型組立てをそれぞれ
断熱筒を介して支持する一対の軸と、断熱筒と軸の間に
取付けられた断熱スペーサとを備えたことを特徴とする
ガラス素子成形装置。(1) A pair of mold assemblies in which a glass material to be heated is placed, a pair of shafts for supporting the pair of mold assemblies through heat insulating cylinders, and the heat insulating cylinders are mounted between the shafts. A glass element molding device comprising a heat insulating spacer.
【０００９】（２） 断熱スペーサは、成形型およびガ
ラス素材を加熱した際、その加熱温度において、耐熱性
を有しかつ強度保持可能なセラミックス製スペーサであ
ることを特徴とする（１）に記載のガラス素子成形装
置。(2) The heat insulating spacer is a ceramic spacer having heat resistance and strength retention at the heating temperature when the mold and the glass material are heated. Glass element molding equipment.
【００１０】（３） 断熱筒は炭化けい素、断熱スペー
サは窒化けい素であることを特徴とする（１）に記載の
ガラス素子成形装置。(3) The glass element molding apparatus according to (1), wherein the heat insulating cylinder is made of silicon carbide and the heat insulating spacer is made of silicon nitride.
【００１１】[0011]
【発明の実施の形態】本発明のガラス素子成形装置は、
石英ガラスのような高温な成形温度の素材をプレス成形
する際にも、断熱筒と断熱スペーサを組合せることで、
型と軸の間に断熱効果を持たせることができ、断熱筒に
異常が生じない。この場合、型はセラミックス製もしく
はカーボン製などであり、断熱筒および断熱スペーサは
窒化珪素または炭化珪素などの耐熱材料および高強度材
料であるセラミックス材料であリ、特に断熱筒は炭化け
い素、断熱スペーサは窒化けい素である。BEST MODE FOR CARRYING OUT THE INVENTION The glass element molding apparatus of the present invention comprises:
By combining a heat insulating tube and a heat insulating spacer when press molding a material with a high molding temperature such as quartz glass,
A heat insulating effect can be provided between the mold and the shaft, and no abnormality occurs in the heat insulating cylinder. In this case, the mold is made of ceramics or carbon, and the heat insulating cylinder and the heat insulating spacer are made of a heat-resistant material such as silicon nitride or silicon carbide and a ceramic material which is a high strength material. Particularly, the heat insulating cylinder is made of silicon carbide or heat insulating material. The spacer is silicon nitride.
【００１２】本発明によれば、ガラス素材を加熱させる
際に、軸と断熱筒との間にスペーサがあるので型と一緒
に断熱筒が加熱されることがなく、あるいは加熱されに
くくなる。これを、断熱筒が炭化けい素、断熱スペーサ
が窒化けい素である場合について具体的に説明する。炭
化けい素は、１２００℃以上での強度が窒化けい素より
も高いために、断熱筒を炭化けい素で構成している。し
かし、炭化けい素は熱伝導率が６３．０ｗ／ｍ・Ｋと高
く、この断熱筒に軸を直接接続すると、型からこの断熱
筒を通して軸へ流れる熱の流れが大きく、断熱筒の角隅
部などに応力集中が生じてここが破損しやすくなる。そ
こで断熱筒と軸との間に窒化けい素の断熱スペーサを介
在させる。窒化けい素は９００℃以下での強度が炭化け
い素より高く、熱伝導率が１２．６ｗ／ｍ・Ｋと低い。
従って、型から軸への熱の流れをこの熱伝導率の低い窒
化けい素の断熱スペーサにより抑制して、断熱筒に与え
る負荷を減少させ、もって、断熱筒の破損を防止するこ
とができる。なお、断熱スペーサが劣化した場合、断熱
スペーサのみを交換すればよい。According to the present invention, when the glass material is heated, since the spacer is provided between the shaft and the heat insulating cylinder, the heat insulating cylinder is not heated together with the mold, or is hardly heated. This will be specifically described for the case where the heat insulating cylinder is silicon carbide and the heat insulating spacer is silicon nitride. Since the strength of silicon carbide at 1200 ° C. or higher is higher than that of silicon nitride, the heat insulating cylinder is made of silicon carbide. However, silicon carbide has a high thermal conductivity of 63.0 w / m · K, and if the shaft is directly connected to this heat insulating cylinder, the heat flow from the mold through this heat insulating cylinder to the shaft is large, and the corners of the heat insulating cylinder are large. Stress concentration occurs in the parts and the like, and the parts are easily damaged. Therefore, a silicon nitride heat insulating spacer is interposed between the heat insulating cylinder and the shaft. Silicon nitride has higher strength at 900 ° C. or lower than silicon carbide and low thermal conductivity of 12.6 w / m · K.
Therefore, the heat flow from the mold to the shaft can be suppressed by the heat insulating spacer made of silicon nitride having a low thermal conductivity, and the load applied to the heat insulating cylinder can be reduced, thereby preventing the heat insulating cylinder from being damaged. When the heat insulating spacer deteriorates, only the heat insulating spacer needs to be replaced.
【００１３】[0013]
【実施例】以下、本発明の実施例を図面を参照し説明す
る。本発明に係るガラス素子３２の成形装置の１例を図
１に示す。この装置はフレーム１の上部から固定軸２が
下方に向かって伸びており、その下端に断熱スペーサ３
３を介してセラミック製の断熱筒３が取付けられ、この
断熱筒３に上型組み立て４が図示しないボルト等により
取り付けられている。上型組み立て４は、金属製又はセ
ラミック・カーボン製のダイプレート５、セラミックや
超硬合金などで作られた上型６、ならびにこの上型６を
ダイプレート５に取り付けると共に型の一部を形成する
固定ダイ７からなっている。そして、断熱スペーサ３
３、断熱筒３は窒化珪素または炭化珪素などの耐熱材料
および高強度材料であるセラミックス材料からなる。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an example of an apparatus for molding the glass element 32 according to the present invention. In this device, a fixed shaft 2 extends downward from an upper portion of a frame 1, and a heat insulating spacer 3 is provided at a lower end thereof.
A heat insulating cylinder 3 made of ceramics is attached via 3, and an upper mold assembly 4 is attached to the heat insulating cylinder 3 with a bolt or the like not shown. The upper die assembly 4 includes a die plate 5 made of metal or ceramic / carbon, an upper die 6 made of ceramic or cemented carbide, and the upper die 6 is attached to the die plate 5 and forms a part of the die. It consists of a fixed die 7. And the heat insulating spacer 3
3. The heat insulating cylinder 3 is made of a heat resistant material such as silicon nitride or silicon carbide and a ceramic material which is a high strength material.
【００１４】フレーム１の下部にはサーボモータ８ａを
駆動源とし、サーボモータ８ａの回転運動を直線運動推
力に変換するスクリュージャッキ等の駆動装置８が設け
られ、駆動装置８には荷重検出装置８ｂを介して移動軸
９が取り付けられている。移動軸９は制御装置２７に入
力したプログラムにより、速度、位置およびトルク制御
可能に上下動し、固定軸２と対向して上方に向かって伸
びている。移動軸９の上端には断熱スペーサ３４を介し
て断熱筒３と同様の断熱筒１０が取り付けられている。
下型組み立て１１は、ダイプレート１２、下型１３およ
び移動ダイ１４からなっている。そして、断熱スペーサ
３４、断熱筒１０は窒化珪素または炭化珪素などの耐熱
材料および高強度材料であるセラミックス材料からな
る。A drive device 8 such as a screw jack for converting a rotational motion of the servo motor 8a into a linear motion thrust is provided below the frame 1 by using a servo motor 8a as a drive source. The drive device 8 includes a load detection device 8b. A moving shaft 9 is attached via. The moving shaft 9 moves up and down so that speed, position and torque can be controlled by a program input to the control device 27, and extends upward facing the fixed shaft 2. A heat insulating cylinder 10 similar to the heat insulating cylinder 3 is attached to the upper end of the moving shaft 9 via a heat insulating spacer 34.
The lower die assembly 11 includes a die plate 12, a lower die 13 and a moving die 14. The heat insulating spacer 34 and the heat insulating cylinder 10 are made of a ceramic material which is a heat resistant material such as silicon nitride or silicon carbide and a high strength material.
【００１５】固定軸２には図示しない駆動装置によって
上下動させるブラケット１５が移動可能に結合されてい
る。ブラケット１５には対をなす型組み立て４，１１の
周囲を囲む石英ガラス管１６が取り付けられている。ブ
ラケット１５には石英ガラス管１６と外筒１８が取り付
けられ、外筒１８にはランプユニット１９が取り付けら
れている。ランプユニット１９は、赤外線ランプ２０と
その後方に配置された反射ミラー２１、さらに反射ミラ
ー２１を冷却するための図示しない水冷パイプから構成
されており、型組み立て４，１１を加熱するようになっ
ている。A bracket 15 that is moved up and down by a driving device (not shown) is movably connected to the fixed shaft 2. Attached to the bracket 15 is a quartz glass tube 16 surrounding the pair of mold assemblies 4 and 11. A quartz glass tube 16 and an outer cylinder 18 are attached to the bracket 15, and a lamp unit 19 is attached to the outer cylinder 18. The lamp unit 19 includes an infrared lamp 20, a reflection mirror 21 arranged behind the infrared lamp 20, and a water cooling pipe (not shown) for cooling the reflection mirror 21, and heats the mold assemblies 4 and 11. There is.
【００１６】フランジ付透明石英管１６の上端はブラケ
ット１５に、はめ込まれたＯ−リングに気密当接してい
る。また、フランジ付透明石英管１６の下端は移動軸９
が貫通している中間プレート１ａのＯ−リングに気密当
接し、型組み立て４，１１の周囲に大気から遮断される
成形室１７を形成するようになっている。The upper end of the transparent quartz tube with a flange 16 is in airtight contact with the O-ring fitted to the bracket 15. Further, the lower end of the transparent quartz tube with a flange 16 has a moving shaft 9
Is airtightly contacted with the O-ring of the intermediate plate 1a penetrating therethrough to form a molding chamber 17 around the mold assemblies 4, 11 which is shielded from the atmosphere.
【００１７】固定軸２、移動軸９およびブラケット１５
には、成形室１７内を不活性ガス雰囲気にしたり、型組
み立て４，１１を冷却するためのガス供給路２２，２３
が設けられ、図示しない流量コントロール計を介して、
不活性ガスを所定流量で成形室１７へ供給するようにな
っている。成形室１７へ供給された不活性ガスは、ガス
排出路２４から排気される。なお、２５は真空排気口、
２６は下型組み立て１１の温度検出用熱電対、２８は真
空バルブ、２９はガス排気バルブ、３０は真空排気装
置、３１は真空計である。Fixed shaft 2, movable shaft 9 and bracket 15
Includes gas supply passages 22 and 23 for cooling the molding chambers 17 and 14 with an inert gas atmosphere.
Is provided, and via a flow control meter (not shown),
The inert gas is supplied to the molding chamber 17 at a predetermined flow rate. The inert gas supplied to the molding chamber 17 is exhausted from the gas exhaust passage 24. In addition, 25 is a vacuum exhaust port,
26 is a thermocouple for temperature detection of the lower mold assembly 11, 28 is a vacuum valve, 29 is a gas exhaust valve, 30 is a vacuum exhaust device, and 31 is a vacuum gauge.
【００１８】この装置を用い、型材質として、ダイプレ
ートおよび移動ダイをカーボン、断熱筒の材質を炭化珪
素、断熱スペーサを窒化珪素としてテストを行なった。Using this apparatus, the die plate and the moving die were made of carbon, the heat insulating cylinder was made of silicon carbide, and the heat insulating spacer was made of silicon nitride.
【００１９】テストでは、石英（ＥＳ：日本石英ガラ
ス）の成形温度である１４００℃において、不活性ガス
雰囲気および減圧雰囲気（５×１０-1Ｐａ）でプレス力
２０ｋＮにおいてプレス成形を実施し、断熱筒が破損し
ないことを確認した。また、前記条件において連続成形
を２００回実施し、断熱筒が破損しないことを確認する
とともに、耐久性の向上を確認した。In the test, press molding was carried out at a pressing temperature of 1400 ° C., which is a molding temperature of quartz (ES: Nippon Quartz Glass), in an inert gas atmosphere and a reduced pressure atmosphere (5 × 10 −1 Pa) with a pressing force of 20 kN, and heat insulation It was confirmed that the tube was not damaged. In addition, continuous molding was carried out 200 times under the above conditions, and it was confirmed that the heat insulating cylinder was not damaged and that durability was improved.
【００２０】[0020]
【発明の効果】本発明によるガラス素子の成形方法によ
れば、石英ガラスなどの高融点ガラスを不活性ガス雰囲
気または減圧雰囲気で成形する場合においても、断熱筒
の破損防止および断熱筒の耐久性向上が図れるため、石
英ガラスなどの高融点ガラスのガラス素子を容易に成形
できる。According to the glass element molding method of the present invention, even when high-melting glass such as quartz glass is molded in an inert gas atmosphere or a reduced pressure atmosphere, the insulation tube is prevented from being damaged and the insulation tube is durable. Since it can be improved, a glass element made of high melting point glass such as quartz glass can be easily formed.
【図１】本発明による光学素子の成形装置の実施例を示
す概略断面図。FIG. 1 is a schematic sectional view showing an embodiment of an optical element molding apparatus according to the present invention.
１…フレーム、２…固定軸、３…断熱筒、４…上型組み
立て、５…ダイプレート、６…上型、７…固定ダイ、８
…駆動装置、８ａ…サーボモータ、８ｂ…荷重検出器、
９…移動軸、１０…断熱筒、１１…下型組み立て、１２
…ダイプレート、１３…下型、１４…移動ダイ、１５…
ブラケット、１６…石英ガラス管、１７…成形室、１８
…外筒、１９…ランプユニット、２０…赤外線ランプ、
２１…反射ミラー、２２，２３…ガス供給路、２４…ガ
ス排出路、２７…制御装置部、２８…真空バルブ、２９
…ガス排気バルブ、３０…真空排気装置、３１…真空
計、３２…ガラス素材、３３…断熱スペーサ、３４…断
熱スペーサ。DESCRIPTION OF SYMBOLS 1 ... Frame, 2 ... Fixed shaft, 3 ... Heat insulation cylinder, 4 ... Upper mold assembly, 5 ... Die plate, 6 ... Upper mold, 7 ... Fixed die, 8
... Drive device, 8a ... Servo motor, 8b ... Load detector,
9 ... Moving shaft, 10 ... Insulating cylinder, 11 ... Lower mold assembly, 12
... die plate, 13 ... lower mold, 14 ... moving die, 15 ...
Bracket, 16 ... Quartz glass tube, 17 ... Molding chamber, 18
... Outer cylinder, 19 ... Lamp unit, 20 ... Infrared lamp,
21 ... Reflective mirror, 22, 23 ... Gas supply path, 24 ... Gas discharge path, 27 ... Control device section, 28 ... Vacuum valve, 29
... Gas exhaust valve, 30 ... Vacuum exhaust device, 31 ... Vacuum gauge, 32 ... Glass material, 33 ... Insulating spacer, 34 ... Insulating spacer.
Claims (3)
の型組立てと、これら一対の型組立てをそれぞれ断熱筒
を介して支持する一対の軸と、断熱筒と軸の間に取付け
られた断熱スペーサとを備えたことを特徴とするガラス
素子成形装置。1. A pair of mold assemblies in which a glass material to be heated is arranged, a pair of shafts respectively supporting the pair of mold assemblies through heat insulating cylinders, and a heat insulating cylinder mounted between the shafts. A glass element molding device comprising a spacer.
材を加熱した際、その加熱温度において、耐熱性を有し
かつ強度保持可能なセラミックス製スペーサであること
を特徴とする請求項１に記載のガラス素子成形装置。2. The heat insulating spacer is a ceramic spacer which has heat resistance and strength retention at the heating temperature when the mold and the glass material are heated. Glass element molding equipment.
化けい素であることを特徴とする請求項１に記載のガラ
ス素子成形装置。3. The glass element molding apparatus according to claim 1, wherein the heat insulating cylinder is made of silicon carbide and the heat insulating spacer is made of silicon nitride.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001298086A JP3854112B2 (en) | 2001-09-27 | 2001-09-27 | Glass element molding equipment |
| TW091120755A TWI225849B (en) | 2001-09-21 | 2002-09-11 | Apparatus for forming glass elements |
| US10/241,433 US6848274B2 (en) | 2001-09-21 | 2002-09-12 | Apparatus for forming glass elements |
| KR1020020056788A KR100818394B1 (en) | 2001-09-21 | 2002-09-18 | Apparatus for forming glass element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001298086A JP3854112B2 (en) | 2001-09-27 | 2001-09-27 | Glass element molding equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2003104743A true JP2003104743A (en) | 2003-04-09 |
| JP3854112B2 JP3854112B2 (en) | 2006-12-06 |
Family
ID=19119042
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001298086A Expired - Fee Related JP3854112B2 (en) | 2001-09-21 | 2001-09-27 | Glass element molding equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3854112B2 (en) |
-
2001
- 2001-09-27 JP JP2001298086A patent/JP3854112B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP3854112B2 (en) | 2006-12-06 |
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