JP2004026540A - Apparatus and method for molding glass - Google Patents

Apparatus and method for molding glass Download PDF

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Publication number
JP2004026540A
JP2004026540A JP2002182807A JP2002182807A JP2004026540A JP 2004026540 A JP2004026540 A JP 2004026540A JP 2002182807 A JP2002182807 A JP 2002182807A JP 2002182807 A JP2002182807 A JP 2002182807A JP 2004026540 A JP2004026540 A JP 2004026540A
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Prior art keywords
mold
glass
molding
temperature
water
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JP4133024B2 (en
Inventor
Isao Shogetsu
松月　功
Takashi Matsumoto
松本　崇
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Shibaura Machine Co Ltd
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Toshiba Machine Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B11/00—Pressing molten glass or performed glass reheated to equivalent low viscosity without blowing
    • C03B11/12—Cooling, heating, or insulating the plunger, the mould, or the glass-pressing machine; cooling or heating of the glass in the mould
    • C03B11/125—Cooling

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To increase a cooling speed of a mold and a molding after press molding and reduce the cycle time required for the press molding of a glass molding in a glass molding apparatus. <P>SOLUTION: Water-cooled plates 15, 25 are disposed at the backs of upper and lower molds 11, 21 respectively. The water-cooled plates 15, 25 are held at the ends of lifting shafts 16, 26 respectively so that they can move parallel to upper and lower shafts 13, 23. In the steps of heating and press molding, both of the water-cooled plates 15, 25 are retracted. After the press molding, the molds 11, 21 are cooled by flowing nitrogen gas into a molding chamber 32 while the molds 11, 21 are closed. After the temperature of the molding reached a specific temperature that is lower than the glass transition temperature, the water-cooled plates 15, 25 are brought into intimate contact with the upper and lower molds 11, 21 respectively at the backs thereof to increase the cooling speed. Then, the molds 11, 21 are opened after the temperature of the molding has reached a specific mold-opening temperature. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
本発明は、例えば光学レンズなどのガラス製成形品のプレス成形装置に係り、特にプレス成形後の金型の冷却機構に関する。
【０００２】
【従来の技術】
光学レンズなどのガラス製の光学素子は、研削及び研磨に基づく方法の他に、プレス成形によっても製造される。
【０００３】
ガラス用のプレス成形装置では、一対の金型の間にガラスの成形素材を配置し、雰囲気調整された成形室の中で金型及び成形素材を加熱し、成形素材がガラス転位温度以上の所定の温度に到達した後、金型の間にプレス荷重を加えて型面の形状をガラスに転写する。プレス成形の後、金型を閉じたままの状態で成形室内に不活性ガス（例えば、窒素ガス）を流して金型及び成形品を冷却し、成形品が所定の温度（型開き温度）に到達した後、金型を開く。その状態で更に金型及び成形品を冷却し、金型及び成形品が所定の温度（取出し温度）に到達した後、成形室を開放し、成形品を回収する。
【０００４】
なお、型開き温度は、ガラス転位温度よりも１００℃程度低い温度に設定される。取出し温度は、金型及び成形品の酸化が問題にならない程度の温度（例えば、２２０℃前後）に設定される。
【０００５】
プレス成形後の冷却工程は、成形温度からガラス転位温度以下の所定の温度までの徐冷工程と、その温度から型開き温度及び取出し温度までの急冷工程とに分かれる。徐冷工程では、成形品の精度を確保するため、金型にプレス力を加えた状態でゆっくり冷却を行う。急冷工程では、ガラス転位温度以下でガラスの熱膨張係数が小さいので、急冷しても成形品の精度に与える影響が小さい。
【０００６】
従来、プレス成形後の金型の冷却は次のような方法で行われていた。即ち、金型を背面から保持しているダイプレートの接触面に溝状の流路を設け、この流路に不活性ガスを流すことにより金型を冷却していた。また、この不活性ガスの流量を調整することによって、冷却速度の調整を行っていた。
【０００７】
（従来技術の問題点）
以上のように、従来のガラス用成形装置ではプレス成形後の金型の冷却を不活性ガスを用いて行っていた。しかし、この方法では十分な冷却速度が得られず、特に、温度が下がるに伴い冷却速度が低下するため、プレス成形のサイクルタイムが長いという問題があった。
【０００８】
【発明が解決しようとする課題】
本発明は、以上のような従来のガラス用成形装置の問題点に鑑み成されたもので、本発明の目的は、ガラスのプレス成形後の金型及び成形品の冷却に要する時間を縮めることができるガラス用成形装置を提供することにある。
【０００９】
【課題を解決するための手段】
本発明のガラス用成形装置は、一対の金型を用いてガラスにプレス荷重を加えて成形するガラス成形用装置において、金型の外面に密着して金型を冷却する水冷プレートを備えたことを特徴とする。
【００１０】
本発明のガラス成形用装置によれば、ガラスをプレス成形した後、成形品の温度が所定の温度まで低下した時点から、従来の不活性ガスによる冷却と並行して、金型の外面に水冷プレートを密着させて金型を急速冷却することができる。これによって、金型及び成形品の冷却速度を増大させて、プレス成形のサイクルタイムを縮めることができる。
【００１１】
好ましくは、上記の水冷プレートによる金型の急速冷却を、ガラスをプレス成形した後、成形品の温度がガラス転位温度よりも０〜１００℃低い温度に到達した時点で開始する。
【００１２】
好ましくは、前記水冷プレートを各金型にそれぞれ設ける。
【００１３】
好ましくは、前記水冷プレートを移動機構で保持し、プレス成形の工程の段階に応じて金型に密着させた状態と金型から離した状態の間で切り替えができるように構成する。
【００１４】
好ましくは、前記水冷プレートを、プレス荷重の方向に対して平行方向に作動するエアシリンダで保持し、プレス成形の工程の段階に応じて金型の背面に密着させた状態と金型の背面から離した状態の間で切り替えるように構成する。
【００１５】
【発明の実施の形態】
図１に本発明に基づくガラス用成形装置の概要を示す。図中、１１は上金型、１３は上軸、２１は下金型、２３は下軸、１５及び２５は水冷プレート、１６及び２６は昇降シャフト、１７及び２７はエアシリンダを表す。
【００１６】
上軸１３の先端には断熱筒１２を介して上金型１１が保持されている。下軸２３の先端には断熱筒２２を介して下金型２１が保持されている。上下の軸１３、２３の先端近傍、上下の断熱筒１２、２２及び上下の金型１１、２１の周囲は、透明石英管３１によって取り囲まれ、透明石英管３１の内側に雰囲気調整が可能な成形室３２が構成されている。透明石英管３１の外側には赤外線加熱ユニット３３が配置されている。なお、上軸１１及び下軸２１の内部には、成形室３２内に不活性ガスを流すためのガスの供給経路及び排気経路（図示せず）が設けられている。
【００１７】
上金型１１の背面側には水冷プレート１５が配置されている。水冷プレート１５は、昇降シャフト１６の先端に保持され、上軸１３に対して平行方向に移動することができる。昇降シャフト１６は、上軸１３の内部に組み込まれたエアシリンダ１７によって駆動される。昇降シャフト１６の内部には、水冷プレート１５内に冷却水を循環させるための冷却水経路（図示せず）が設けられている。
【００１８】
同様に、下金型２１の背面側にも水冷プレート２５が配置されている。水冷プレート２５は、昇降シャフト２６の先端に保持され、下軸２３に対して平行方向に移動することができる。昇降シャフト２６は、下軸２３の内部に組み込まれたエアシリンダ２７によって駆動される。なお、昇降シャフト２６の内部には、水冷プレート２５内に冷却水を循環させるための冷却水経路（図示せず）が設けられている。
【００１９】
次に、この装置を用いたガラス成形の工程について説明する。
【００２０】
下型２１の上にガラスの成形素材（図示せず）をセットした後、下型２１と上型１１を近付け、その状態で成形室３２内の雰囲気を調整しながら、赤外線ランプユニット３３を用いて上下の金型１１、２１及び成形素材を加熱する。なお、この段階では、上下の昇降シャフト１６、２６を縮め、水冷プレート１５を上型１１の上方の退避位置、水冷プレート２５を下型２１の下方の退避位置に、それぞれ後退させておく。
【００２１】
成形素材がガラス転移温度以上の所定の成形温度に到達して安定した後、下軸２３（または上軸１３）を駆動し、上下の金型１１、２１の背面から荷重を加えてプレス成形を行う。これによって、上下の金型１１、２１の型面の形状がガラスに転写される。
【００２２】
プレス成形の後、金型１１、２１を閉じたままの状態で成形室３２内に窒素ガスを流して金型１１、２１及び成形品を徐冷する。成形品がガラス転移温度よりも０〜１００℃程度低い所定の温度に到達した後、上下の昇降シャフト１６、２６を伸ばし、水冷プレート１５を上型１１の背面に、水冷プレート２５を下型２１の背面に、それぞれ密着させる。これによって、金型１１、２１及び成形品の冷却速度を増大させる。なお、通常、これと並行して成形室３２内への窒素ガスの供給も継続する。
【００２３】
成形品がガラス転移温度よりも０〜１００℃程度低い所定の温度（型開き温度）に到達した後、金型１１、２１を開き、その状態で更に金型１１、２１及び成形品を冷却する。金型１１、２１及び成形品が２５０〜２００℃程度の温度（取出し温度）に到達した後、成形室３２を開放し、成形品を回収する。
【００２４】
図２に、上記のガラス用成形装置におけるプレス成形サイクル中の温度パターンの測定結果の一例を示す。なお、成形素材及び成形品の温度は、下金型の型面の近傍に埋め込まれた熱電対を用いて測定した。使用した成形素材は光学ガラス：ＢＫ−７（オハラ社製）、金型の外形は１１０ｍｍであった。
【００２５】
図に示す通り、従来では８分要していた急冷工程を２分に短縮することができた。成形品の精度は、従来の成形装置を用いた場合と変らなかった。
【００２６】
【発明の効果】
本発明のガラス用成形装置によれば、金型及び成形品の冷却速度を増大させることができる。その結果、プレス成形のサイクルタイムを縮め、ガラス成形品の製造コストを引き下げることができる。
【図面の簡単な説明】
【図１】本発明のガラス用成形装置の概略構成を示す図。
【図２】本発明のガラス用成形装置における温度パターンの一例を示す図。
【符号の説明】
１１・・・上金型、
１２、２２・・・断熱筒、
１３・・・上軸、
１５、２５・・・冷却プレート、
１６、２６・・・昇降シャフト、
１７、２７・・・エアシリンダ、
２１・・・下金型、
２３・・・下軸、
３１・・・透明石英管、
３２・・・成形室、
３３・・・赤外線ランプユニット。[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an apparatus for press-forming a glass-made product such as an optical lens, and more particularly to a cooling mechanism for a mold after press-forming.
[0002]
[Prior art]
Glass optical elements such as optical lenses are manufactured by press molding in addition to methods based on grinding and polishing.
[0003]
In a press forming apparatus for glass, a molding material for glass is arranged between a pair of dies, and the dies and the molding material are heated in a molding chamber where the atmosphere is adjusted. Is reached, a press load is applied between the molds to transfer the shape of the mold surface to the glass. After press molding, the mold and the molded product are cooled by flowing an inert gas (eg, nitrogen gas) into the molding chamber while the mold is closed, and the molded product is brought to a predetermined temperature (mold opening temperature). After reaching, open the mold. In this state, the mold and the molded product are further cooled, and after the mold and the molded product have reached a predetermined temperature (removal temperature), the molding chamber is opened and the molded product is collected.
[0004]
The mold opening temperature is set to a temperature lower by about 100 ° C. than the glass transition temperature. The unloading temperature is set to a temperature at which oxidation of the mold and the molded article does not pose a problem (for example, around 220 ° C.).
[0005]
The cooling process after press molding is divided into a slow cooling process from a molding temperature to a predetermined temperature equal to or lower than a glass transition temperature, and a rapid cooling process from the temperature to a mold opening temperature and a removal temperature. In the slow cooling step, in order to secure the accuracy of the molded product, the mold is cooled slowly while applying a pressing force. In the quenching step, since the coefficient of thermal expansion of the glass is small below the glass transition temperature, even if quenching has little effect on the accuracy of the molded product.
[0006]
Conventionally, cooling of a mold after press molding has been performed by the following method. That is, a groove-shaped flow path is provided on the contact surface of the die plate holding the die from the back, and the die is cooled by flowing an inert gas through this flow path. Further, the cooling rate is adjusted by adjusting the flow rate of the inert gas.
[0007]
(Problems of conventional technology)
As described above, in the conventional glass forming apparatus, the die after the press forming is cooled using the inert gas. However, this method cannot provide a sufficient cooling rate, and in particular, has a problem that the cycle time of press molding is long because the cooling rate decreases as the temperature decreases.
[0008]
[Problems to be solved by the invention]
The present invention has been made in view of the problems of the conventional glass forming apparatus described above, and an object of the present invention is to reduce the time required for cooling a mold and a molded product after glass press forming. It is an object of the present invention to provide a glass forming apparatus capable of forming a glass.
[0009]
[Means for Solving the Problems]
The glass forming apparatus of the present invention is a glass forming apparatus for forming a glass by applying a press load to a glass using a pair of dies, wherein a water cooling plate for cooling the dies in close contact with an outer surface of the dies is provided. It is characterized by.
[0010]
According to the apparatus for glass molding of the present invention, after the glass is press-molded, from the time when the temperature of the molded article falls to a predetermined temperature, water cooling is performed on the outer surface of the mold in parallel with conventional cooling with an inert gas. The mold can be rapidly cooled by bringing the plate into close contact. Thereby, the cooling speed of the mold and the molded product can be increased, and the cycle time of press molding can be shortened.
[0011]
Preferably, the rapid cooling of the mold by the water-cooled plate is started when the temperature of the molded article reaches a temperature lower by 0 to 100 ° C. than the glass transition temperature after press-molding the glass.
[0012]
Preferably, the water cooling plate is provided in each mold.
[0013]
Preferably, the water-cooled plate is held by a moving mechanism, and can be switched between a state in which the plate is in close contact with the mold and a state in which the plate is separated from the mold in accordance with the stage of the press molding process.
[0014]
Preferably, the water-cooled plate is held by an air cylinder that operates in a direction parallel to the direction of the press load, and the state in which the water-cooled plate is in close contact with the back surface of the mold according to the stage of the press molding process and the back surface of the mold. It is configured to switch between separated states.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 shows an outline of a glass forming apparatus according to the present invention. In the figure, 11 is an upper mold, 13 is an upper shaft, 21 is a lower mold, 23 is a lower shaft, 15 and 25 are water-cooled plates, 16 and 26 are elevating shafts, and 17 and 27 are air cylinders.
[0016]
An upper mold 11 is held at a tip of the upper shaft 13 via a heat insulating cylinder 12. A lower mold 21 is held at the tip of the lower shaft 23 via a heat insulating cylinder 22. The vicinity of the tips of the upper and lower shafts 13 and 23, the periphery of the upper and lower heat insulating cylinders 12 and 22, and the upper and lower molds 11 and 21 are surrounded by a transparent quartz tube 31, and the inside of the transparent quartz tube 31 can be atmosphere-adjusted. A chamber 32 is configured. An infrared heating unit 33 is disposed outside the transparent quartz tube 31. A gas supply path and an exhaust path (not shown) for flowing an inert gas into the molding chamber 32 are provided inside the upper shaft 11 and the lower shaft 21.
[0017]
On the back side of the upper mold 11, a water cooling plate 15 is arranged. The water cooling plate 15 is held at the tip of the elevating shaft 16, and can move in a direction parallel to the upper shaft 13. The lifting shaft 16 is driven by an air cylinder 17 incorporated inside the upper shaft 13. A cooling water path (not shown) for circulating cooling water in the water cooling plate 15 is provided inside the elevating shaft 16.
[0018]
Similarly, a water cooling plate 25 is arranged on the back side of the lower mold 21. The water cooling plate 25 is held at the tip of the elevating shaft 26, and can move in a direction parallel to the lower shaft 23. The elevating shaft 26 is driven by an air cylinder 27 incorporated inside the lower shaft 23. Note that a cooling water path (not shown) for circulating cooling water in the water cooling plate 25 is provided inside the elevating shaft 26.
[0019]
Next, a glass molding process using this apparatus will be described.
[0020]
After setting a molding material (not shown) made of glass on the lower mold 21, the lower mold 21 and the upper mold 11 are brought close to each other, and while adjusting the atmosphere in the molding chamber 32 in that state, the infrared lamp unit 33 is used. To heat the upper and lower dies 11, 21 and the molding material. At this stage, the upper and lower elevating shafts 16 and 26 are contracted, and the water cooling plate 15 is retracted to the retracted position above the upper mold 11 and the water cooling plate 25 is retracted to the retracted position below the lower mold 21.
[0021]
After the molding material reaches a predetermined molding temperature equal to or higher than the glass transition temperature and is stabilized, the lower shaft 23 (or the upper shaft 13) is driven to apply a load from the rear surfaces of the upper and lower dies 11, 21 to perform press molding. Do. Thereby, the shapes of the upper and lower molds 11, 21 are transferred to the glass.
[0022]
After press molding, a nitrogen gas is flowed into the molding chamber 32 with the dies 11 and 21 kept closed to gradually cool the dies 11 and 21 and the molded product. After the molded article reaches a predetermined temperature lower than the glass transition temperature by about 0 to 100 ° C., the upper and lower elevating shafts 16 and 26 are extended, and the water cooling plate 15 is placed on the back of the upper mold 11, and the water cooling plate 25 is placed on the lower mold 21. To the back of Thereby, the cooling speed of the dies 11, 21 and the molded product is increased. Usually, the supply of the nitrogen gas into the molding chamber 32 is also continued in parallel with this.
[0023]
After the molded product reaches a predetermined temperature (mold opening temperature) lower by about 0 to 100 ° C. than the glass transition temperature, the molds 11 and 21 are opened, and in this state, the molds 11 and 21 and the molded product are further cooled. . After the dies 11, 21 and the molded product have reached a temperature (removal temperature) of about 250 to 200 ° C., the molding chamber 32 is opened and the molded product is collected.
[0024]
FIG. 2 shows an example of a measurement result of a temperature pattern during a press forming cycle in the above-described glass forming apparatus. The temperatures of the molding material and the molded product were measured using a thermocouple embedded near the mold surface of the lower mold. The molding material used was an optical glass: BK-7 (manufactured by OHARA), and the outer shape of the mold was 110 mm.
[0025]
As shown in the figure, the quenching process, which conventionally required eight minutes, could be reduced to two minutes. The precision of the molded product was not different from the case using the conventional molding apparatus.
[0026]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to the glass shaping | molding apparatus of this invention, the cooling rate of a metal mold | die and a molded article can be increased. As a result, the cycle time of press molding can be shortened, and the manufacturing cost of a glass molded product can be reduced.
[Brief description of the drawings]
FIG. 1 is a diagram showing a schematic configuration of a glass forming apparatus of the present invention.
FIG. 2 is a diagram showing an example of a temperature pattern in the glass forming apparatus of the present invention.
[Explanation of symbols]
11 ... upper mold,
12, 22, ... a heat insulating cylinder,
13 ... upper shaft,
15, 25 ... cooling plate,
16, 26 ... elevating shaft,
17, 27 ... air cylinder,
21 ... lower mold
23 ... lower shaft,
31 ... Transparent quartz tube,
32 molding chamber
33 ... Infrared lamp unit.

Claims (5)

一対の金型を用いてガラスにプレス荷重を加えて成形するガラス成形用装置において、金型の外面に密着して金型を冷却する水冷プレートを備えたことを特徴とするガラス用成形装置。What is claimed is: 1. A glass forming apparatus for forming a glass by applying a press load to glass using a pair of dies, comprising a water cooling plate for cooling the dies in close contact with an outer surface of the dies. 前記水冷プレートは、各金型にそれぞれ設けられていることを特徴する請求項１に記載のガラス用成形装置。The glass forming apparatus according to claim 1, wherein the water cooling plate is provided in each mold. 前記水冷プレートは、移動機構に保持され、成形工程の段階に応じて金型に密着した状態と金型から離れた状態の間で切り替えができるように構成されていることを特徴とする請求項２に記載のガラス用成形装置。The water-cooled plate is held by a moving mechanism, and is configured to be switchable between a state in which the plate is in close contact with the mold and a state in which the plate is separated from the mold according to the stage of the molding process. 3. The molding apparatus for glass according to 2. 前記水冷プレートは、プレス荷重の方向に対して平行方向に作動するエアシリンダに保持され、成形工程の段階に応じて金型の背面に密着した状態と金型の背面から離れた状態の間で切り替えられるように構成されていることを特徴とする請求項３に記載のガラス用成形装置。The water-cooled plate is held by an air cylinder that operates in a direction parallel to the direction of the press load, and between a state in which it is in close contact with the back of the mold and a state in which it is separated from the back of the mold according to the stage of the molding process. The glass forming apparatus according to claim 3, wherein the apparatus is configured to be switchable. 一対の金型を用いてガラスにプレス荷重を加えて成形するガラス成形方法において、
ガラスを加熱してプレス成形した後、成形品の温度がガラス転位温度よりも０〜１００℃低い温度に到達した時点で、金型の外面に水冷プレートを密着させて金型の急速冷却を開始することを特徴とするガラス成形方法。In a glass forming method of applying a press load to glass using a pair of molds,
After the glass is heated and press-molded, when the temperature of the molded product reaches a temperature 0 to 100 ° C lower than the glass transition temperature, a water-cooled plate is brought into close contact with the outer surface of the mold to start rapid cooling of the mold. A glass forming method.
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JP2001080926A (en) * 1999-09-07 2001-03-27 Olympus Optical Co Ltd Press forming device for optical element
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JPS6414118A (en) * 1987-07-08 1989-01-18 Hitachi Ltd Metallic die structure for forming precise glass product
JPH0234526A (en) * 1988-07-26 1990-02-05 Matsushita Electric Ind Co Ltd Glass lens forming die, method for forming glass lens using said die, and device for forming glass lens
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