JP2986603B2 - Method and apparatus for forming glass molded product - Google Patents
Method and apparatus for forming glass molded productInfo
- Publication number
- JP2986603B2 JP2986603B2 JP3354939A JP35493991A JP2986603B2 JP 2986603 B2 JP2986603 B2 JP 2986603B2 JP 3354939 A JP3354939 A JP 3354939A JP 35493991 A JP35493991 A JP 35493991A JP 2986603 B2 JP2986603 B2 JP 2986603B2
- Authority
- JP
- Japan
- Prior art keywords
- glass
- temperature
- glass material
- poise
- heating
- 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 - Fee Related
Links
Classifications
-
- 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
-
- 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
- C03B11/06—Construction of plunger or mould
- C03B11/08—Construction of plunger or mould for making solid articles, e.g. lenses
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B7/00—Distributors for the molten glass; Means for taking-off charges of molten glass; Producing the gob, e.g. controlling the gob shape, weight or delivery tact
- C03B7/10—Cutting-off or severing the glass flow with the aid of knives or scissors or non-contacting cutting means, e.g. a gas jet; Construction of the blades used
- C03B7/12—Cutting-off or severing a free-hanging glass stream, e.g. by the combination of gravity and surface tension forces
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B7/00—Distributors for the molten glass; Means for taking-off charges of molten glass; Producing the gob, e.g. controlling the gob shape, weight or delivery tact
- C03B7/14—Transferring molten glass or gobs to glass blowing or pressing machines
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、ガラス成形品の製造方
法および装置に係るものであり、特に研削、研磨加工を
必要としない高精度なガラス成形品の製造方法および装
置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for producing a glass molded article, and more particularly to a method and an apparatus for producing a highly accurate glass molded article which does not require grinding and polishing.
【０００２】[0002]
【従来の技術】最近、ガラス素材を加熱して押圧成形す
るだけで研削、研磨加工を必要とせずに、高い形状精度
と表面品質を有したガラス成形品（プレスレンズ）を得
ることができる成形方法が確立されつつある。かかる成
形方法としては、あらかじめ表面処理をした素材を加熱
して押圧成形する、いわゆるリヒートプレス法が一般的
ではあるが、素材費を低減するために、溶融状態のガラ
スからそのまま成形する、いわゆるダイレクトプレス法
を応用した方法も行われている。この場合、溶融された
ガラス流は、通常、中心に至る程温度が高くなるため、
成形時にヒケが出易く、寸法精度の高い成形品を得るこ
とが困難になる。2. Description of the Related Art Recently, it is possible to obtain a glass molded product (press lens) having high shape accuracy and surface quality without the need for grinding and polishing by simply heating and pressing and molding a glass material. A method is being established. As such a forming method, a so-called reheat press method of heating and press-forming a material which has been subjected to a surface treatment in advance, which is generally called a reheat press method, is directly molded from a glass in a molten state in order to reduce material costs. A method applying a press method is also performed. In this case, the molten glass flow usually has a higher temperature as it reaches the center,
Sinking tends to occur during molding, and it is difficult to obtain a molded product with high dimensional accuracy.
【０００３】ガラス流の温度分布を制御する方法として
は、例えば実公昭４８−１７２３７号公報に記載された
方法が知られている。これは、ガラス溶融槽に流出管を
連通して設けるとともに、この流出管の中心部に冷却管
および給送管を設けてガラス流の中心部に冷却用媒体を
導くように構成したもので、ガラス流の中心部を冷却す
るようにして、ガラスゴブを成形した場合の成形時のヒ
ケを減少させようとするものである。As a method of controlling the temperature distribution of the glass flow, a method described in, for example, Japanese Utility Model Publication No. 48-17237 is known. This is configured so that an outflow pipe is provided in communication with the glass melting tank, and a cooling pipe and a feed pipe are provided at the center of the outflow pipe to guide the cooling medium to the center of the glass flow. The purpose of the present invention is to cool down the central portion of the glass flow to reduce sink marks during molding when a glass gob is molded.
【０００４】[0004]
【発明が解決しようとする課題】しかし、前記従来の成
形方法によれば、溶融ガラス中心温度と表面温度の差は
５０℃になると記されているが、光学素子等の高精度品
を製造するには、さらにそれらの温度差を大きくしてで
きる方法や装置が望まれる。また、前記方法の冷却管等
は、成形品の大きさや形状等により、その太さ、配置形
状等を変えなければ十分な効果を得ることができない
が、そうすると多くの費用と時間が必要になってしま
う。However, according to the conventional molding method, the difference between the center temperature of the molten glass and the surface temperature is described as 50 ° C., but a high precision product such as an optical element is manufactured. Therefore, a method and apparatus capable of further increasing the temperature difference are desired. In addition, the cooling pipe and the like of the above method cannot obtain a sufficient effect unless the thickness, arrangement and the like are changed depending on the size and shape of the molded product, but this requires a lot of cost and time. Would.
【０００５】本発明は、かかる従来の問題点に鑑みてな
されたもので、成形品の面精度を向上させるために溶融
ガラスの内部に対し外周部の方が高い温度となるように
任意に制御可能であり、また成形品の大きさや形状等が
変化に対応できるガラス成形品の成形方法および装置を
提供することを目的とする。The present invention has been made in view of the above-mentioned conventional problems, and is arbitrarily controlled so that the temperature of the outer peripheral portion is higher than that of the inside of the molten glass in order to improve the surface accuracy of the molded product. It is an object of the present invention to provide a method and an apparatus for forming a glass molded product, which are possible and can respond to changes in the size and shape of the molded product.
【０００６】[0006]
【課題を解決するための手段】上記目的を達成するため
に、本発明は、ガラス成形品を成形するにあたり、ガラ
ス素材の全体の粘度が１０5 ポイズ以下になるまで加熱
した後、ガラス素材の中心部の粘度が１０5 ポイズ以上
１０12ポイズ以下になるまで一旦冷却し、その後ガラス
素材の表面部の温度が内部の温度より高くなるように加
熱し、次にそのガラス素材を型に供給して成形すること
とした。Means for Solving the Problems In order to achieve the above object, the present invention relates to a method for forming a glass molded article, which comprises heating the glass material until the overall viscosity of the glass material becomes 10 5 poise or less. Cool once until the viscosity of the central part becomes 10 5 poise or more and 10 12 poise or less, then heat so that the temperature of the surface of the glass material becomes higher than the internal temperature, and then supply the glass material to the mold. To be molded.
【０００７】また、本発明は、ガラス素材の全体の粘度
が１０5 ポイズ以下になるまで加熱する第１の加熱手段
と、この第１の加熱手段で加熱されたガラス素材の温度
を低下させつつ搬送する搬送手段と、ガラス素材の表面
部を急速加熱して中央部の温度に対して温度差を設ける
第２の加熱手段と、ガラス素材を成形する手段とを具備
させてガラス成形品の成形装置を構成した。Further, the present invention provides a first heating means for heating the whole glass material to a viscosity of 10 5 poise or less, and a method for reducing the temperature of the glass material heated by the first heating means. Forming a glass molded article by providing a conveying means for conveying, a second heating means for rapidly heating a surface portion of the glass material to provide a temperature difference with respect to a temperature of a central portion, and a means for forming the glass material; The device was configured.
【０００８】[0008]
【作用】図１および図２に、本発明および通常のダイレ
クトプレスの場合の、ガラス表面と内部との粘度変化の
様子を示す。図２に示す従来例では、供給されたガラス
は型に接触して表面が急速に冷やされて固化するが、中
心はなかなか冷えないため、ヒケを生じる原因となる。
一方、図１に示す本発明では、型に供給される前のガラ
スの表面の温度が中心の温度より高いために、ヒケを生
じにくくなる。FIG. 1 and FIG. 2 show how the viscosity changes between the glass surface and the interior in the case of the present invention and a normal direct press. In the conventional example shown in FIG. 2, the supplied glass comes into contact with the mold, and the surface is rapidly cooled and solidified. However, the center is not easily cooled, which causes sink marks.
On the other hand, in the present invention shown in FIG. 1, since the surface temperature of the glass before being supplied to the mold is higher than the center temperature, sink is unlikely to occur.
【０００９】本発明にて、最初に１０5 ポイズ以下にな
るまでガラス素材を加熱するのは、泡の無い溶融ガラス
を得るためである。また、ガラス素材の中心部が１０5
ポイズ以上１０12以下になるまで一旦冷却するのは、１
０5 ポイズ以下では内部の温度が高すぎて成形した際の
ガラスの収縮量が多く、結局、ヒケを生じてしまうこと
になるからであり、一方、１０12ポイズ以上では、ガラ
スに十分な流動性が無くなり、所望の形状に成形できな
くなるからである。In the present invention, the reason why the glass material is first heated to 10 5 poise or less is to obtain a bubble-free molten glass. The center of the glass material is 10 5
It is necessary to cool once until it becomes 10 12 or less.
0-5 poise is often shrinkage amount of the glass when the molding temperature inside is too high, after all, is because so that occurs the sink, while in 10 12 poise or more, sufficient to glass flow This is because the property is lost and it becomes impossible to mold into a desired shape.
【００１０】[0010]
【実施例１】図３は本発明の一実施例を示すもので、る
つぼ１の外周壁部には、加熱ヒータ２が装備されてい
る。そして、加熱ヒータ２により、るつぼ１内のガラス
素材３は１０4 ポイズ以下となる温度に加熱され、溶融
ガラスとされる。また、るつぼ１の下端にはノズル４が
設けられており、ノズル４の外周にも加熱ヒータ２が装
備されている。溶融ガラスのガラス流５はノズル４先端
から流出される。ここに、ノズル４の温度を制御する
と、ガラス流５は、断続的に液滴となって、ノズル４の
下方に位置する受け皿６の上に落下される。この受け皿
６は、図示を省略した駆動装置により回転駆動される回
転軸７の上端に固着されたアーム８に取り付けられてい
る。そして、受け皿６は、アーム８の軸回りに１８０°
回転できるように設けられている。Embodiment 1 FIG. 3 shows an embodiment of the present invention, in which a heater 2 is provided on the outer peripheral wall of a crucible 1. Then, the glass material 3 in the crucible 1 is heated by the heater 2 to a temperature of 10 4 poise or less to be a molten glass. A nozzle 4 is provided at the lower end of the crucible 1, and a heater 2 is also provided around the nozzle 4. The glass stream 5 of the molten glass flows out of the tip of the nozzle 4. Here, when the temperature of the nozzle 4 is controlled, the glass stream 5 intermittently becomes droplets and drops onto the tray 6 located below the nozzle 4. The receiving tray 6 is attached to an arm 8 fixed to an upper end of a rotating shaft 7 driven to rotate by a driving device (not shown). The pan 6 is set at 180 ° around the axis of the arm 8.
It is provided so that it can rotate.
【００１１】受け皿６の上に落下されたガラスゴブ９
は、アーム８が回転軸７の駆動により回転される間に冷
却され、対をなす上型１０と下型１１との間にセットさ
れる。また、このセット位置でガラスゴブ９の表面を加
熱できるように、２方向にガスバーナー１２が配設され
ている。The glass gob 9 dropped on the tray 6
The arm 8 is cooled while the arm 8 is rotated by the drive of the rotating shaft 7 and is set between the upper mold 10 and the lower mold 11 forming a pair. Further, gas burners 12 are arranged in two directions so that the surface of the glass gob 9 can be heated at this set position.
【００１２】上記構成の成形装置を用いて光学素子の成
形を行った。ガラス素材３の原料としてＬａ系ガラスを
用い、ノズル４の温度を９００℃（１０3.5 ポイズ）に
制御した。受け皿６を予め５００℃に予熱しておき、ノ
ズル４から受け皿６にるつぼ１で脱泡、均質化処理した
溶融状態のガラス流５を供給した。そして、回転軸７を
回転駆動させ、ガラス流５の供給後４秒後に中心部が７
２０℃（１０6.5 ポイズ相当）で表面が７００℃（１０
8 ポイズ相当）となったガラスゴブ９が上下型１０，１
１間にセットされるようにアーム８および受け皿６を回
転した。この間にガラスゴブ９は冷却され、その中心部
の粘度は１０5 ポイズ以上１０12ポイズ以下になった。
上記セット後、ガスバーナー１２によりガラスゴブ９の
表面を加熱した。この状態で、ガラスゴブ９の表面は約
８００℃（約１０5 ポイズ相当）になり、中心部は約７
００℃（約１０8 ポイズ相当）になっていた。次に、受
け皿６をアーム８の軸回りに１８０°回転させて、ガラ
スゴブ９を下型１１上に落下させ、６１０℃（ガラスゴ
ブ９では約１０14ポイズ相当）に加熱保持した上下型１
０，１１により成形し、ガラス成形品を得た。The optical element was molded using the molding apparatus having the above-mentioned structure. With La based glass as a raw material of the glass material 3, and control the temperature of the nozzle 4 to 900 ° C. (10 3.5 poise). The tray 6 was preheated to 500 ° C. in advance, and the molten glass stream 5 that had been defoamed and homogenized in the crucible 1 was supplied from the nozzle 4 to the tray 6. Then, the rotating shaft 7 is driven to rotate, and the center portion becomes 7 seconds after the supply of the glass flow 5.
At 20 ° C (equivalent to 10 6.5 poise), the surface becomes 700 ° C (10
The glass gob 9 is equivalent to 8 poise)
The arm 8 and the pan 6 were rotated so as to be set between one. During this time, the glass gob 9 was cooled, and the viscosity at the center became 10 5 poise to 10 12 poise.
After the setting, the surface of the glass gob 9 was heated by the gas burner 12. In this state, the surface of the glass gob 9 has a temperature of about 800 ° C. (corresponding to about 10 5 poise), and the center is about 7 ° C.
The temperature was 00 ° C. (corresponding to about 10 8 poise). Next, the pan 6 is rotated by 180 ° around the axis of the arm 8, the glass gob 9 is dropped onto the lower mold 11, and the upper and lower molds 1 are heated and held at 610 ° C. (corresponding to about 10 14 poise in the glass gob 9).
Molding was performed according to 0, 11 to obtain a glass molded product.
【００１３】このようにして得られたガラス成形品は、
ヒケが全く無く、精密な転写性を有する高精度の成形品
であった。[0013] The glass molded article thus obtained is
There was no sink mark, and it was a highly accurate molded product having precise transferability.
【００１４】[0014]
【実施例２】図４は本発明の他の実施例を示すもので、
実施例１と同様にしてるつぼ１３の外周壁部には、加熱
ヒータ１４が装備されている。るつぼ１３の下端にはほ
ぼ水平にノズル１５が設けられており、ノズル１５の外
周にも加熱ヒータ１６が装備され、ガラス流５の流出速
度、粘度を厳密に制御できるようになっている。ここ
に、ノズル１５の傾斜角度及び長さと加熱ヒータ１６の
温度は、溶融したガラス素材３がノズル１５内を流動す
る間に前記溶融したガラス素材３の粘度（温度）から、
所望の粘度（温度）に、ノズル１５の断面積で均一に達
するまで冷却することができるように設定される。Embodiment 2 FIG. 4 shows another embodiment of the present invention.
A heater 14 is provided on the outer peripheral wall of the crucible 13 in the same manner as in the first embodiment. A nozzle 15 is provided substantially horizontally at the lower end of the crucible 13, and a heater 16 is also provided on the outer periphery of the nozzle 15, so that the outflow speed and viscosity of the glass flow 5 can be strictly controlled. Here, the inclination angle and length of the nozzle 15 and the temperature of the heater 16 are determined from the viscosity (temperature) of the molten glass material 3 while the molten glass material 3 flows through the nozzle 15.
The nozzle 15 is set so that it can be cooled to a desired viscosity (temperature) until the nozzle 15 has a uniform cross-sectional area.
【００１５】ノズル１５の先端は、真空ポンプ（図示省
略）により１０-2Ｔｏｒｒ以下の真空度にすることが可
能な真空槽１７内に挿入されている。また、この真空槽
１７内には、ノズル１５先端の下方に、ノズル１５から
流出するガラス流５を挟むようにして、相対向する一対
の型１８，１９が配設されている。そして、一方の型１
９の周囲には、リング状のシャー２０が設置されてお
り、型１８，１９による成形と同時にガラス流５を切断
できるようになっている。さらに、真空槽１７内には、
一方の型１９の下方に電子銃２１が設置されており、マ
グネットによって電子ビーム２２を１８０°偏向（Ｕタ
ーン）させ、ガラス流５の表面を急速加熱できるように
なっている。The tip of the nozzle 15 is inserted into a vacuum chamber 17 which can be evacuated to a vacuum of 10 -2 Torr or less by a vacuum pump (not shown). A pair of opposite dies 18 and 19 are disposed in the vacuum chamber 17 below the tip of the nozzle 15 so as to sandwich the glass flow 5 flowing out of the nozzle 15. And one mold 1
A ring-shaped shear 20 is provided around the periphery 9 so that the glass stream 5 can be cut simultaneously with the molding by the dies 18 and 19. Furthermore, in the vacuum chamber 17,
An electron gun 21 is provided below one mold 19, and the electron beam 22 is deflected by 180 ° (U-turn) by a magnet so that the surface of the glass stream 5 can be rapidly heated.
【００１６】上記構成の成形装置を用いて光学素子の成
形を行った。ガラス素材３の原料としてＳＦ系ガラスを
用い、加熱ヒータ１４によりガラス素材３を溶融させ、
脱泡、均質化処理し、その温度を１３００℃（１０3 ポ
イズ相当）に保った。また、加熱ヒータ１６によりノズ
ル１５におけるガラス素材３の温度を中心部および表面
ともに６５０℃（１０7 ポイズ相当）にした。これによ
り、溶融されたガラス流５はノズル１５内でいったん冷
却されることになる。その後、ガラス流５をノズル１５
の先端から除々に流出させた。The optical element was molded using the molding apparatus having the above-described structure. Using SF-based glass as a raw material of the glass material 3, the glass material 3 is melted by the heater 14,
Defoaming, and homogenized, maintaining the temperature at 1300 ° C. (10 3 poises or equivalent). Further, the temperature of the glass material 3 in the nozzle 15 at the center and the surface was set to 650 ° C. (corresponding to 10 7 poise) by the heater 16. As a result, the molten glass stream 5 is once cooled in the nozzle 15. Thereafter, the glass flow 5 is applied to the nozzle 15
Slowly drained from the tip.
【００１７】ガラス流５が流出し始めると同時に、電子
銃２１によりガラス流５の表面を急速加熱した。この時
の加熱条件は、出力１ｋＷ、加速電圧４ｋＶとした。こ
の加熱により、ガラス流５の表面の温度は、２秒後に８
００℃（１０5 ポイズ相当）まで上昇する一方、中心部
の温度は６５０℃（１０7 ポイズ相当）と変化しなかっ
た。このような状態で、型１８，１９をそれぞれ前進さ
せ、ガラス流５を挟んで押圧成形するとともに、リング
状のシャー２０によりガラス流５を切断した。At the same time as the glass stream 5 began to flow, the surface of the glass stream 5 was rapidly heated by the electron gun 21. The heating conditions at this time were an output of 1 kW and an acceleration voltage of 4 kV. By this heating, the temperature of the surface of the glass stream 5 becomes 8 after 2 seconds.
While the temperature rose to 00 ° C. (corresponding to 10 5 poise), the temperature at the center did not change to 650 ° C. (corresponding to 10 7 poise). In such a state, the dies 18 and 19 were respectively advanced, pressed and formed with the glass stream 5 interposed therebetween, and the glass stream 5 was cut by the ring-shaped shear 20.
【００１８】このようにして得られたガラス成形品は、
実施例１と同様に、ヒケが全く無く、精密な転写性を有
する高精度の成形品であった。特に、本実施例では、加
熱源として電子銃２１を用いているので、実施例１と比
較してクリーンで急速な加熱を実現できる。[0018] The glass molded product thus obtained is
As in the case of Example 1, there was no sink mark, and the molded product was a high-precision molded product having precise transferability. In particular, in this embodiment, since the electron gun 21 is used as a heating source, clean and rapid heating can be realized as compared with the first embodiment.
【００１９】なお、ガラス流の表面の急速加熱方法とし
ては、上記実施例に限定されるものではなく、プラズマ
を利用したり、抵抗加熱を利用する等の種々の方法が適
用できる。The method for rapidly heating the surface of the glass flow is not limited to the above embodiment, and various methods such as using plasma or using resistance heating can be applied.
【００２０】[0020]
【発明の効果】以上のように、本発明のガラス成形品の
成形方法および装置によれば、溶融されたガラスの表面
における温度を中心部よりも高くて型間に供給すること
ができるので、ヒケのない高精度なガラス成形品を製造
でき、また得ようとする成形品の大きさや形状等が異な
っても何等の変更なしに対応できる。As described above, according to the method and the apparatus for molding a glass molded article of the present invention, the temperature of the surface of the molten glass can be supplied between the molds at a higher temperature than the central portion. A highly accurate glass molded product without sink marks can be manufactured, and even if the size or shape of the molded product to be obtained is different, it can be handled without any change.
【図１】本発明によるガラス表面と内部との粘度変化を
示すグラフである。FIG. 1 is a graph showing a change in viscosity between the glass surface and the inside according to the present invention.
【図２】従来の通常のダイレクトプレスによるガラス表
面と内部との粘度変化を示すグラフである。FIG. 2 is a graph showing a change in viscosity between the glass surface and the interior by a conventional ordinary direct press.
【図３】本発明の実施例１の成形装置を示す概略構成図
である。FIG. 3 is a schematic configuration diagram illustrating a molding apparatus according to a first embodiment of the present invention.
【図４】本発明の実施例２の成形装置を示す概略構成図
である。FIG. 4 is a schematic configuration diagram illustrating a molding apparatus according to a second embodiment of the present invention.
１，１３ るつぼ ２，１４，１６ 加熱ヒータ ３ ガラス素材 ４，１５ ノズル ５ ガラス流 ９ ガラスゴブ １０ 上型 １１ 下型 １２ ガスバーナー １８，１９ 型 ２１ 電子銃 1,13 Crucible 2,14,16 Heater 3 Glass material 4,15 Nozzle 5 Glass flow 9 Glass gob 10 Upper die 11 Lower die 12 Gas burner 18,19 type 21 Electron gun
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平３−265528（ＪＰ，Ａ) 特開 平３−295822（ＪＰ，Ａ) 実公 昭48−17237（ＪＰ，Ｙ１) (58)調査した分野(Int.Cl.6，ＤＢ名) C03B 11/00 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-265528 (JP, A) JP-A-3-295822 (JP, A) Jiko 48-17237 (JP, Y1) (58) Field (Int.Cl. 6 , DB name) C03B 11/00
Claims (2)
以下になるまで加熱した後、ガラス素材の中心部の粘度
が１０5 ポイズ以上１０12ポイズ以下になるまで一旦冷
却し、その後ガラス素材の表面部の温度が内部の温度よ
り高くなるように加熱し、次にそのガラス素材を型に供
給して成形することを特徴とするガラス成形品の成形方
法。After heating until the viscosity of the glass material becomes 10 5 poise or less, the glass material is once cooled until the viscosity at the center of the glass material becomes 10 5 poise or more and 10 12 poise or less. A method for forming a glass molded product, comprising heating the surface portion so as to be higher than the internal temperature, and then supplying the glass material to a mold for molding.
以下になるまで加熱する第１の加熱手段と、この第１の
加熱手段で加熱されたガラス素材の温度を低下させつつ
搬送する搬送手段と、ガラス素材の表面部を急速加熱し
て中央部の温度に対して温度差を設ける第２の加熱手段
と、ガラス素材を成形する手段とを具備することを特徴
とするガラス成形品の成形装置。2. A first heating means for heating the whole glass material to a viscosity of 10 5 poise or less, and a conveying means for conveying the glass material while lowering the temperature of the glass material heated by the first heating means. A second heating means for rapidly heating the surface portion of the glass material to provide a temperature difference with respect to the temperature of the central portion; and a means for forming the glass material. apparatus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3354939A JP2986603B2 (en) | 1991-12-20 | 1991-12-20 | Method and apparatus for forming glass molded product |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3354939A JP2986603B2 (en) | 1991-12-20 | 1991-12-20 | Method and apparatus for forming glass molded product |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05170454A JPH05170454A (en) | 1993-07-09 |
| JP2986603B2 true JP2986603B2 (en) | 1999-12-06 |
Family
ID=18440915
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3354939A Expired - Fee Related JP2986603B2 (en) | 1991-12-20 | 1991-12-20 | Method and apparatus for forming glass molded product |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2986603B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090007599A1 (en) * | 2006-02-23 | 2009-01-08 | Peter Muhle | Method and Device For Producing Technical Glass Parts For Optical Applications |
| JP5033340B2 (en) * | 2006-03-20 | 2012-09-26 | 株式会社オハラ | Molding apparatus and glass molded product manufacturing apparatus using the same |
| DE102014103431B4 (en) * | 2014-03-13 | 2015-10-01 | Schott Ag | Method and apparatus for reducing the saberiness of thin glasses and thereafter produced thin glass band |
-
1991
- 1991-12-20 JP JP3354939A patent/JP2986603B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05170454A (en) | 1993-07-09 |
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