JPH0629147B2 - Optical element molding method - Google Patents

Optical element molding method

Info

Publication number
JPH0629147B2
JPH0629147B2 JP3540188A JP3540188A JPH0629147B2 JP H0629147 B2 JPH0629147 B2 JP H0629147B2 JP 3540188 A JP3540188 A JP 3540188A JP 3540188 A JP3540188 A JP 3540188A JP H0629147 B2 JPH0629147 B2 JP H0629147B2
Authority
JP
Japan
Prior art keywords
molding
glass
cutting
molded product
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.)
Expired - Lifetime
Application number
JP3540188A
Other languages
Japanese (ja)
Other versions
JPH01212238A (en
Inventor
勇 執行
剛 野村
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Canon Inc
Original Assignee
Canon Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Canon Inc filed Critical Canon Inc
Priority to JP3540188A priority Critical patent/JPH0629147B2/en
Publication of JPH01212238A publication Critical patent/JPH01212238A/en
Publication of JPH0629147B2 publication Critical patent/JPH0629147B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/32—Component parts, details or accessories; Auxiliary operations
    • B29C43/36—Moulds for making articles of definite length, i.e. discrete articles
    • B29C43/40—Moulds for making articles of definite length, i.e. discrete articles with means for cutting the article
    • 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
    • C03B21/00—Severing glass sheets, tubes or rods while still plastic
    • C03B21/02—Severing glass sheets, tubes or rods while still plastic by cutting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/32—Component parts, details or accessories; Auxiliary operations
    • B29C43/36—Moulds for making articles of definite length, i.e. discrete articles
    • B29C43/361—Moulds for making articles of definite length, i.e. discrete articles with pressing members independently movable of the parts for opening or closing the mould, e.g. movable pistons
    • B29C2043/3615—Forming elements, e.g. mandrels or rams or stampers or pistons or plungers or punching devices
    • B29C2043/3618—Forming elements, e.g. mandrels or rams or stampers or pistons or plungers or punching devices plurality of counteracting elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
    • B29C43/021—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles characterised by the shape of the surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/32—Component parts, details or accessories; Auxiliary operations
    • B29C43/36—Moulds for making articles of definite length, i.e. discrete articles
    • B29C43/361—Moulds for making articles of definite length, i.e. discrete articles with pressing members independently movable of the parts for opening or closing the mould, e.g. movable pistons
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/32—Component parts, details or accessories; Auxiliary operations
    • B29C43/50—Removing moulded articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2011/00—Optical elements, e.g. lenses, prisms
    • B29L2011/0016—Lenses
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2215/00—Press-moulding glass
    • C03B2215/70—Horizontal or inclined press axis
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2215/00—Press-moulding glass
    • C03B2215/76—Pressing whereby some glass overflows unrestrained beyond the press mould in a direction perpendicular to the press axis
    • C03B2215/77—Pressing whereby some glass overflows unrestrained beyond the press mould in a direction perpendicular to the press axis with means to trim off excess material

Landscapes

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

Description

【発明の詳細な説明】 （産業上の利用分野） 本発明は、プレス成形による光学素子の成形用型に関
し、より詳細には、プレス成形後において研削及び研摩
等の工程を経ることなしに表面精度及び重量精度の良好
な光学素子又はそのリヒートプレス用として好適するプ
リフォームの成形方法に関する。Description: TECHNICAL FIELD The present invention relates to a mold for molding an optical element by press molding, and more specifically, it relates to a surface of a mold without undergoing steps such as grinding and polishing after press molding. The present invention relates to an optical element having good accuracy and weight accuracy, or a preform molding method suitable for a reheat press thereof.

（従来の技術） 近年、所定の表面精度を有する成形用型内にガラス素材
を収容してプレス成形することにより、研削及び研摩等
の後加工を不要とした高精度の光学素子を成形する方法
が開発されている。(Prior Art) In recent years, a method for molding a high-precision optical element that does not require post-processing such as grinding and polishing by accommodating a glass material in a molding die having a predetermined surface accuracy and performing press molding. Is being developed.

このプレス成形法には、一般にリヒートプレス法とダイ
レクトプレス法がある。This press molding method generally includes a reheat pressing method and a direct pressing method.

リヒートプレス法は、予め溶融固化したガラス材料の必
要量を切断し、砂ずり等の方法により重量調整を施して
ガラス小塊とし、これを成形用型内に入れ、該ガラス小
塊と成形用型を同時に又は別々にプレス温度まで加熱し
た後、プレス成形して成形用型に形成した光学機能面を
押圧転写して光学素子を成形する方法である。The reheat press method is to cut a necessary amount of glass material that has been melted and solidified in advance, adjust the weight by a method such as sanding to make a glass small piece, put this in a mold for molding, This is a method of molding an optical element by heating the molds simultaneously or separately to a pressing temperature and then press-transferring the optical functional surface formed on the molding mold by press molding.

一方、ダイレクトプレス法は、溶融ガラス流出オリフィ
スより流出若しくは押出される溶融ガラス流の必要量を
切断刃により切断し、これを成形用型内に直接落下させ
るか又はシュートによって投入し、しかる後成形用型を
押圧して光学素子を成形する方法である。On the other hand, the direct pressing method cuts a necessary amount of the molten glass flow outflowing or extruding from the molten glass outflow orifice with a cutting blade and directly dropping it into a molding die or introducing it with a chute, and thereafter molding. This is a method of molding an optical element by pressing a mold.

又、上記のリヒートプレス法において、切断及び砂ずり
等のような生産性の低い工程を経ずに上記のダイレクト
プレス法における如く、溶融ガラスを成形用型に入れて
プレス成形し、最終製品に近似した形状の予備成形品
（プリフォーム）を得た上で該プリフォームを最終製品
の形状及び面精度と同じか若しくはそれ以上に精度の高
い光学機能面を有する成形用型に入れてプレス成形を行
なう方法がある。Further, in the above reheat press method, the molten glass is put into a molding die and press-molded into a final product as in the above direct press method without passing through low productivity steps such as cutting and sand shaving. After obtaining a preformed product (preform) having an approximate shape, the preform is put into a molding die having an optical functional surface having the same or higher accuracy as the shape and surface accuracy of the final product and press molding. There is a way to do.

（発明が解決しようとする問題点） これらの成形方法により得られた光学素子は、良好な像
形成品質が得られるよう所定の面精度及び寸法精度が要
求され、又このため上記のいずれの方法においても最終
製品を得るためのプレス成形に供給されるガラス材料は
十分に重量調整がなされていなければならない。(Problems to be Solved by the Invention) The optical element obtained by these molding methods is required to have predetermined surface accuracy and dimensional accuracy so as to obtain good image forming quality. Even in the above, the glass material supplied to the press molding for obtaining the final product must be sufficiently adjusted in weight.

しかしながら、上記のガラス小塊を用いてプレス成形す
る方法では、ガラス小塊の重量調整を切断及び砂ずり等
により行なうため、成形品の表面に砂目が残留したり、
プレス成形前にガラス小塊を加熱する際、ガラスと加熱
用受皿との融着を防止するために塗布した離型剤がプレ
ス時に成形品の表面に食い込んで該成形品の表面精度が
著しく悪化するという問題がある。However, in the method of press-molding using the above-mentioned small glass pieces, since the weight adjustment of the small glass pieces is performed by cutting and sanding, etc., sand grains remain on the surface of the molded product,
When heating a small piece of glass before press molding, the mold release agent applied to prevent fusion between the glass and the saucer for cutting bites into the surface of the molded product during pressing and the surface accuracy of the molded product deteriorates significantly. There is a problem of doing.

又、直接溶融ガラスを用いてプレス成形する方法では、
切断刃による切断の際、成形品にシャーマークと称せら
れる切断痕が生じ、成形品の面精度が劣化するという問
題がある。又、このプレス成形法においては、成形品の
重量調整を溶融ガラス流の切断によって行なうため、こ
の溶融ガラス流の温度変化や切断タイミング或いはガラ
ス流の脈動等により成形品に重量変動が生じ、所定の寸
法精度が得られないという問題点もある。Also, in the method of press molding using molten glass directly,
When cutting with a cutting blade, there is a problem that a cut mark called a shear mark is generated on the molded product, and the surface accuracy of the molded product deteriorates. Further, in this press molding method, since the weight of the molded product is adjusted by cutting the molten glass flow, the molded product has a weight variation due to temperature change of the molten glass flow, cutting timing, pulsation of the glass flow, etc. There is also a problem that the dimensional accuracy of is not obtained.

なお、特にシャーマークの発生を防止したプレス成形法
としては、特公昭４１−９１９０号公報或いは特開昭６
１−１３２５２３号公報に記載されたものがある。In addition, as a press molding method in which the occurrence of shear marks is particularly prevented, Japanese Patent Publication No. 41190/41 or Japanese Unexamined Patent Publication No.
There is one described in JP-A-1-132523.

特公昭４１−９１９０号公報に記載された成形方法で
は、成形用型を溶融ガラスの流下方向に直角の方向に押
圧して型空所内に溶融ガラスを充填させてプレス成形す
る方法であるが、成形用型の押圧時に型空所内の余剰ガ
ラスが成形用型とこれに対向するアンビルとの間から流
出するという現象が生じる。この余剰ガラスは成形用型
の押圧動作が進行するに伴い、その流出抵抗を増大する
とともに成形用型により冷却されて粘性を増し、これが
成形用型とこれに対向するアンビル間で完全に切取られ
ないまま冷却されて成形品の外周にはみ出し部分を形成
する。このため、プレス成形後においてこのはみ出し部
分の破断及び破断面を仕上げる作業が必要となる。又、
溶融ガラス流の大きさが変動することにより上記した成
形品とはみ出し部分との間のガラス厚さが変動して成形
品の厚さにバラツキが生じてしまい、重量調整が高精度
に行なえないという問題もある。In the molding method described in JP-B-41-9190, a molding die is pressed in a direction perpendicular to the flow direction of the molten glass to fill the mold cavity with the molten glass and press-mold it. When the molding die is pressed, a phenomenon occurs in which excess glass in the mold cavity flows out between the molding die and the anvil facing the molding die. As the pressing operation of the molding die progresses, this excess glass increases its outflow resistance and is cooled by the molding die to increase its viscosity, which is completely cut off between the molding die and the anvil facing it. It is cooled without being formed to form a protruding portion on the outer periphery of the molded product. Therefore, it is necessary to finish the fracture and the fracture surface of the protruding portion after the press molding. or,
Because the glass thickness between the above-mentioned molded product and the protruding portion fluctuates due to the change in the size of the molten glass flow, the thickness of the molded product varies, and the weight cannot be adjusted with high accuracy. There are also problems.

一方、特開昭６１−１３２５２３号公報に記載された成
形方法では、成形品の精度は流動するガラス体を打抜く
前の該ガラス体の大きさ等に依存しており高精度の寸法
形状を有するロッド又はガラスシートが必要となる。On the other hand, in the molding method described in Japanese Patent Laid-Open No. 61-132523, the precision of the molded product depends on the size of the glass body before punching the flowing glass body, etc. It requires a rod or glass sheet to have.

本発明者等は、上述のような問題点を解決すべく、成形
品にシャーマーク等の表面欠陥がなく、寸法精度がすこ
ぶる良好な光学素子の製造方法について既に提案してあ
る。In order to solve the above-mentioned problems, the present inventors have already proposed a method for producing an optical element which has no surface defects such as shear marks on a molded product and has excellent dimensional accuracy.

通常、加熱したガラス材料を冷却すると表面から硬化層
が形成され次第に中央に及んで全体が硬化してゆく。従
って、上記のような製造方法において、成形用型の外周
に設けられた切断部材でプレス成形直後の成形品の外周
側面を切断する際には、成形品内部のまだ硬化していな
い軟化ガラスの上表面に薄い硬化層が形成された状態に
ある。Usually, when the heated glass material is cooled, a hardened layer is formed from the surface and gradually the whole is hardened to reach the center. Therefore, in the manufacturing method as described above, when cutting the outer peripheral side surface of the molded product immediately after press molding with the cutting member provided on the outer periphery of the molding die, the uncured softened glass inside the molded product A thin hardened layer is formed on the upper surface.

このような成形品の外周側面を上記切断部材で切断する
場合、該切断部材はまず成形品の表面硬化層から切断す
るよう作用するが、成形品内部がまだ軟らかいため、上
記の表面硬化層を成形品内部に幾分引込んだ後に破断
し、冷却後この部分が成形品外周の角部にヒビやワレと
なって残留するか、又は当該部分にカラス粉を生じてし
まうおそれがある。しかるに、このようなカケ或はガラ
ス粉の発生は成形品の外形形状を著しく損なうばかり
か、重量精度が不安定になり、又成形品の外周角部を光
学的に機能させる場合には所定の光学性能が得られない
という不都合が生じる。本発明は上記のようなカケ等の
発生を防止し、成形品の外周形状及び重量精度ともに優
れた光学素子の成形方法を提供することを目的とする。When cutting the outer peripheral side surface of such a molded product with the above cutting member, the cutting member first acts to cut from the surface hardened layer of the molded product, but since the inside of the molded product is still soft, There is a risk that after some pulling into the inside of the molded product, it will break, and after cooling, this portion will remain as cracks or cracks at the corners of the outer periphery of the molded product, or crow powder will form at that portion. However, the occurrence of such chipping or glass powder not only seriously impairs the outer shape of the molded product, but also makes the weight accuracy unstable, and when the outer peripheral corners of the molded product are made to function optically, a predetermined amount is required. The inconvenience arises that the optical performance cannot be obtained. It is an object of the present invention to provide a method for molding an optical element that prevents the occurrence of chipping and the like as described above and is excellent in the outer peripheral shape and weight accuracy of the molded product.

（問題点を解決するための手段） 上述した従来の問題点を解決するために、本発明の光学
素子の成形方法は、ガラス流体を狭むように対向配置さ
れた一対の成形用型部材を前記ガラス流体に対し略直角
方向から押圧して被成形部の機能面を形成するととも
に、前記型部材の外周に設けられ該型部材の外周に沿っ
て摺動せしめることにより前記被成形部の外周側面を切
断する光学素子の成形方法において、前記切断部材の先
端部を前記成形用型の成形面よりやや突出した状態で前
記型部材を前記被成形部に対し押圧し、次いで前記切断
部材を作動させて前記被成形部の外周側面を切断するこ
とを特徴とする。(Means for Solving Problems) In order to solve the above-mentioned conventional problems, a method of molding an optical element according to the present invention is a method in which a pair of molding die members opposed to each other so as to narrow a glass fluid is used. The functional surface of the molded portion is formed by pressing the fluid from a direction substantially perpendicular to the fluid, and the outer peripheral side surface of the molded portion is provided by sliding along the outer periphery of the mold member provided on the outer periphery of the mold member. In the method of molding an optical element for cutting, the die member is pressed against the molding target portion with the tip end portion of the cutting member slightly protruding from the molding surface of the molding die, and then the cutting member is operated. The outer peripheral side surface of the molded portion is cut.

（作用） 本発明においては、成形用型部材の外周に設けられた切
断部材の先端部を上記型部材の成形面よりやや突出した
状態にして対向する型部材の成形面間にガラス流体を狭
み、該ガラス流体に対して型部材を押圧しプレス成形す
る。このような状態でプレス成形される成形品の外周角
部の形状は、切断部材の先端部内周と型部材の成形面よ
り形成され、切断部材の成形品外周に対する切断は成形
品外周の角部からやや側部に入った部分から開始され
る。このため、成形品の外周角部の形成は切断部材の切
断動作に影響されない。このような形成方法は、凸レン
ズのような成形品角部が鈍角を成すものよりも凹レンズ
のような成形品角部が鋭角を成すものにおいてより効果
的である。(Operation) In the present invention, the glass fluid is narrowed between the molding surfaces of the opposing mold members with the tip of the cutting member provided on the outer periphery of the molding member slightly protruding from the molding surface of the mold member. Then, the mold member is pressed against the glass fluid to perform press molding. The shape of the outer peripheral corner of the molded product press-molded in such a state is formed by the inner periphery of the tip of the cutting member and the molding surface of the mold member, and the cutting of the cutting member with respect to the outer periphery of the molded product is performed by cutting the outer peripheral corner of the molded product. It starts from the part that entered the side partly. Therefore, the formation of the outer peripheral corners of the molded product is not affected by the cutting operation of the cutting member. Such a forming method is more effective in the case where the corners of the molded product such as a concave lens form an acute angle than those where the corners of the molded product form an obtuse angle.

なお、上記の成形方法にて構成された成形用型の配置状
況としては、ガラス流体が例えば溶融炉からノズルを介
して流出する溶融ガラスである場合、該溶融ガラスの流
下方向に対して略直角方向に一対の型部材の各成形面が
対向するよう配置することができる。又、ガラス流体が
既に成形加工されたものを再加熱することにより流動性
を有するロッド或いはシート状の場合、上記のような配
置状況のほか、一対の型部材が各々上下方向に対向する
よう配置することも可能である。そこで、例えば流下す
る溶融ガラス流体に対して、本発明における成形用型を
構成すると、このガラス流体の流れの方向に対して略直
角方向から各々の型部材が互いに押圧される構成とな
り、流下するガラス流体に対して各々の型部材の押圧の
タイミングを調整することにより、ガラス流体の先端部
即ち切断跡を避けて被成形部を形成することができる。As for the arrangement of the molding die constituted by the above-mentioned molding method, when the glass fluid is, for example, molten glass flowing out from a melting furnace through a nozzle, it is substantially perpendicular to the flowing direction of the molten glass. The molding surfaces of the pair of mold members may be arranged to face each other in the direction. In the case of a rod or sheet that has fluidity by reheating a glass fluid that has already been molded and processed, in addition to the above arrangement conditions, a pair of mold members are arranged so as to face each other in the vertical direction. It is also possible to do so. Therefore, for example, when the molding die of the present invention is configured to flow down the molten glass fluid, the die members are pressed against each other in a direction substantially perpendicular to the flow direction of the glass fluid, and flow down. By adjusting the timing of pressing each mold member against the glass fluid, it is possible to form the portion to be molded while avoiding the tip portion of the glass fluid, that is, the cut mark.

又、上記構成において、被成形部の肉厚は成形用型のキ
ャビティを予め設定することにより決まる。このキャビ
ティは、プレス成形時の各々の型部材の成形面間隔によ
り設定することができる。各型部材の押圧時に生じる余
剰ガラスは成形面の外方に自由に流出し、成形品の肉厚
はガラス流の大きさ等に影響されることなく上記成形用
型のキャビティにより決まる。Further, in the above structure, the wall thickness of the portion to be molded is determined by presetting the cavity of the molding die. This cavity can be set by the molding surface distance of each mold member during press molding. Excess glass generated when each mold member is pressed freely flows out of the molding surface, and the wall thickness of the molded product is determined by the cavity of the molding mold without being affected by the size of the glass flow or the like.

かくして得られた成形品は上記のようにガラス流体の切
断跡を含まない部分から形成されたものであるからシャ
ーマーク等の表面欠陥がない。Since the molded product thus obtained is formed from a portion which does not include a cutting trace of the glass fluid as described above, it does not have surface defects such as shear marks.

又、予め設定されたキャビティ、ガイド部材及び切断部
材による被成形部の外周形成により形状精度及び重量精
度の高い成形品が得られる。Further, by forming the outer periphery of the portion to be molded by the preset cavity, guide member and cutting member, a molded product with high shape accuracy and weight accuracy can be obtained.

この成形品の機能面は各型部材の成形面が転写されるこ
とにより形成されるから、各々の成形面の表面性状を所
望する成形品の表面性状と同等かそれ以上に高精度なも
のに仕上げてプレス成形することにより、高精度表面を
有する成形品が得られる。Since the functional surface of this molded product is formed by transferring the molded surface of each mold member, the surface texture of each molded surface should be equal to or higher than that of the desired molded product. By finishing and press-molding, a molded product having a highly accurate surface can be obtained.

（実施例） 以下、本発明の実施例について図面を参照しながら説明
する。(Example) Hereinafter, the Example of this invention is described, referring drawings.

第１図（ａ）は本発明の実施例に用いられるプレス成形
装置の概略断面図である。第１図（ｂ）は第１図（ａ）
のＡ−Ａ線に沿う断面図である。第２図〜第７図は第１
図に示す装置の要部断面図であり、同装置の工程順の作
動状態が示してある。FIG. 1 (a) is a schematic sectional view of a press molding apparatus used in an embodiment of the present invention. FIG. 1 (b) is FIG. 1 (a).
It is sectional drawing which follows the AA line. 2 to 7 are the first
FIG. 4 is a cross-sectional view of the main part of the device shown in the figure, showing the operating state of the device in the order of steps.

第１図（ａ）において、１は不図示の溶融炉から溶融ガ
ラスを流出するノズルであり、２はこのノズルから流出
したガラス流体であり、３はガラス流体２の先端に生じ
た切断跡である。４はノズル１の下方に設けられ、不図
示の駆動装置により開閉動作を行なうことによりガラス
流体２を切断する切断刃である。In FIG. 1 (a), 1 is a nozzle for flowing molten glass out of a melting furnace (not shown), 2 is a glass fluid flowing out of this nozzle, and 3 is a cutting trace generated at the tip of the glass fluid 2. is there. A cutting blade 4 is provided below the nozzle 1 and cuts the glass fluid 2 by performing an opening / closing operation by a driving device (not shown).

本実施例に示すプレス成形装置は、ガラス流体２がノズ
ル１から流下する形式のものに対して構成されており、
一対の成形用型を構成する第１の型部材５と第２の型部
材６とがガラス流体２を略直角方向から挟むように互い
に対向した状態で配置してある。型部材５，６は、対向
する夫々の面に鏡面加工が施された成形面５ａ，６ａを
有している。これら型部材５，６の各成形面５ａ，６ａ
により形成されるキャビティは、以下に示すシリンダー
１３，１６の夫々のストロークにより設定することがで
きる。The press molding apparatus shown in this embodiment is configured for a type in which the glass fluid 2 flows down from the nozzle 1,
A first mold member 5 and a second mold member 6 which form a pair of molding dies are arranged so as to face each other so as to sandwich the glass fluid 2 from a substantially perpendicular direction. The mold members 5 and 6 have molding surfaces 5a and 6a whose respective surfaces facing each other are mirror-finished. Molding surfaces 5a, 6a of these mold members 5, 6
The cavity formed by can be set by the stroke of each of the cylinders 13 and 16 described below.

各型部材５，６の内部にはヒーター８，９が設けられて
いる。１０，１１は夫々のヒーターに接続された導線で
ある。Heaters 8 and 9 are provided inside the mold members 5 and 6, respectively. 10 and 11 are conducting wires connected to the respective heaters.

第２の型部材６の外周には、切断リング７が該第２の型
部材６の外周に沿って摺動可能に設けられている。A cutting ring 7 is provided on the outer periphery of the second die member 6 so as to be slidable along the outer periphery of the second die member 6.

第１の型部材５は第１のスライダー１４に固着され、こ
の第１のスライダー１４は本装置全体のベース１９に固
設された第１のスライドシャフト１８に摺動可能に保持
されている。又、第１のスライダー１４はシリンダーロ
ッド１６ａを介して第１のシリンダー１６に接続され、
この第１のシリンダー１６の駆動により第１のスライダ
ー１４は第１のスライドシャフト１８の摺動方向に移動
して第１の型部材５の（第２の型部材６方向への）押圧
動作を行ない、又は該第１の型部材５の復帰動作を行な
う。The first mold member 5 is fixed to a first slider 14, and the first slider 14 is slidably held by a first slide shaft 18 fixed to a base 19 of the entire apparatus. Further, the first slider 14 is connected to the first cylinder 16 via a cylinder rod 16a,
By driving the first cylinder 16, the first slider 14 moves in the sliding direction of the first slide shaft 18 and presses the first mold member 5 (in the direction of the second mold member 6). Or the returning operation of the first mold member 5 is performed.

一方、第２の型部材６はアダプター１２を介して第２の
スライダー２７と連結され、この第２のスライダー２７
はベース１９に固設された第２のスライドシャフト２８
に摺動可能に保持されている。又、第２のスライダー２
７はシリンダーロッド１３ａを介して第２のシリンダー
１３に接続され、この第２のシリンダー１３の駆動によ
り第２のスライダー２７は第２のスライドシャフト２８
の摺動方向に移動して第２の型部材６の（第１の型部材
５方向への）押圧動作を行ない、又は第２の型部材６の
復帰動作を行なう。On the other hand, the second mold member 6 is connected to the second slider 27 via the adapter 12, and the second slider 27
Is a second slide shaft 28 fixed to the base 19.
It is held slidably on. Also, the second slider 2
7 is connected to the second cylinder 13 via a cylinder rod 13a, and by driving this second cylinder 13, the second slider 27 causes the second slide shaft 28 to move.
In the sliding direction, the second die member 6 is pressed (in the direction of the first die member 5) or the second die member 6 is returned.

上記第２のスライダー２７は、第１図（ｂ）に示すよう
に、上述した如く第２のスライドシャフト２８に摺動可
能に保持されるとともに、スリーブ２６を摺動可能に保
持し、さらにこのスリーブ２６内にはプッシュロッド２
４が摺動可能に保持されている。従って、これら第２の
スライダー２７、スリーブ２６及びプッシュロッド２４
は第２のスライドシャフト２８の摺動方向と同方向に移
動するよう構成されている。As described above, the second slider 27 is slidably held by the second slide shaft 28 and the sleeve 26, as shown in FIG. 1 (b). Push rod 2 in sleeve 26
4 is slidably held. Therefore, these second slider 27, sleeve 26 and push rod 24
Are configured to move in the same direction as the sliding direction of the second slide shaft 28.

スリーブ２６の両端には、スリーブフランジ２６ａ、２
６ｂが設けられている。これらスリーブフランジのうち
切断リング７側に設けられたスリーブフランジ２６ｂは
ロッド２５を介して第３のスライダー１５に連結され、
第３のスライダー１５は第１のスライドシャフト１８に
摺動可能に保持されるとともに上記第２の型部材６の外
周に設けられた切断リング７と固着保持されている。At both ends of the sleeve 26, sleeve flanges 26a, 2
6b is provided. Of these sleeve flanges, the sleeve flange 26b provided on the cutting ring 7 side is connected to the third slider 15 via the rod 25,
The third slider 15 is slidably held by the first slide shaft 18 and fixedly held by the cutting ring 7 provided on the outer periphery of the second die member 6.

又、スリーブフランジのうち第３のシリンダー１７側に
設けられたスリーブフランジ２６ａと第２のスライダー
２７との間には復帰用スプリング３０が介在してある。A return spring 30 is interposed between the second slider 27 and the sleeve flange 26a provided on the third cylinder 17 side of the sleeve flange.

プッシュロッド２４の切断リング７と反対の側には上記
スリーブフランジ２６ａと当接可能なプッシュロッドフ
ランジ２４ａが設けられるとともにこの側がシリンダー
ロッド１７ａを介して第３のシリンダー１７に接続さ
れ、該第３のシリンダー１７の駆動によりプッシュロッ
ド２４がスリーブ２６内を摺動しつつ移動する。A push rod flange 24a capable of contacting the sleeve flange 26a is provided on the side of the push rod 24 opposite to the cutting ring 7, and this side is connected to the third cylinder 17 via the cylinder rod 17a. When the cylinder 17 is driven, the push rod 24 moves while sliding in the sleeve 26.

このような構成において、切断リング７と第２の型部材
６との相対的な位置関係は例えばロッド２５の長さによ
って調整することができる。このロッド２５は両端がネ
ジ締結により固着される構成となっているため交換が可
能であり、所望の切断リング７と第２の型部材６との相
対位置に応じて交換するようにする。特に、本実施例に
おいては、第２図にその拡大した状況を示すように、切
断リング７の先端が第２の型部材６に対してやや突出す
る（突出長さをＬで示す）ように設定されている。In such a configuration, the relative positional relationship between the cutting ring 7 and the second mold member 6 can be adjusted by the length of the rod 25, for example. Since both ends of the rod 25 are fixed by screw fastening, they can be replaced, and the rod 25 is replaced according to the desired relative position between the cutting ring 7 and the second die member 6. In particular, in this embodiment, as shown in the enlarged view of FIG. 2, the tip of the cutting ring 7 slightly projects from the second mold member 6 (the projecting length is indicated by L). It is set.

このような構成により、第２のシリンダー１３が駆動し
て当該シリンダーロッド１３ａを押圧方向に作動する
と、第２のスライダー２７はアダプター１２を介して第
２の型部材６を押圧方向に移動するとともに、第２のス
ライダー２７はスリーブ２６のフランジ２６ｂを介して
ロッド２５を作動し切断リング７を第２の型部材６につ
いて第１の型部材５の方向に摺動させる。この動作にお
いては第２の型部材６と切断リング７の作動は一体的に
行なわれ両者間における相対的な移動は成されない。With such a configuration, when the second cylinder 13 is driven and the cylinder rod 13a is actuated in the pressing direction, the second slider 27 moves the second die member 6 in the pressing direction via the adapter 12. , The second slider 27 actuates the rod 25 via the flange 26b of the sleeve 26 to slide the cutting ring 7 in the direction of the first mold member 5 with respect to the second mold member 6. In this operation, the second mold member 6 and the cutting ring 7 are actuated integrally, and no relative movement is made between them.

又、第３のシリンダー１７が駆動して当該シリンダーロ
ッド１７ａを第１の型部材５の方向に作動すると、プッ
シュロッド２４が作動し、この際プッシュロッド２４の
フランジ２４ａがスリーブ２６のフランジ２６ａに当接
して該スリーブ２６及びこれに連結されたロッド２５を
介して第３のスライダー１５が作動せしめられ、切断リ
ング７が第２の型部材６の外周について第１の型部材５
の方向に摺動せしめられる。又、第３のシリンダー１７
が第２の型部材５とは反対方向に駆動されると、スリー
ブ２６のフランジ２６ａと第２のスライダー２７間の復
帰用スプリング３０の復元力により、スリーブ２６は第
１の型部材５とは反対方向に移動し、これに伴ない切断
リング７も同方向に復帰移動する。When the third cylinder 17 is driven and the cylinder rod 17a is actuated in the direction of the first die member 5, the push rod 24 is actuated, and at this time, the flange 24a of the push rod 24 becomes the flange 26a of the sleeve 26. The third slider 15 is actuated through the sleeve 26 and the rod 25 connected to the sleeve 26 so that the cutting ring 7 is attached to the outer periphery of the second die member 6 to the first die member 5
It can be slid in the direction of. Also, the third cylinder 17
Is driven in the opposite direction to the second die member 5, the sleeve 26 is separated from the first die member 5 by the restoring force of the return spring 30 between the flange 26a of the sleeve 26 and the second slider 27. The cutting ring 7 moves in the opposite direction, and the cutting ring 7 also returns in the same direction.

次に本装置の動作について第２〜７図及び第８図を用い
て説明する。第２図〜６図は、本装置の各工程順におけ
る作動状態を示す要部断面図である。第８図は本装置に
おける作動部、即ち第１の型部材５、第２の型部材６、
切断刃４及び切断部材７の各部作動タイミングを示すタ
イミングチャートであり、横軸は時間Ｔを示す。これら
作動部の作動タイミングは、各作動部を接続した不図示
のコントローラーにより制御可能である。Next, the operation of this device will be described with reference to FIGS. 2 to 6 are cross-sectional views of essential parts showing the operating state of the present apparatus in the order of steps. FIG. 8 shows an operating portion of the apparatus, that is, a first mold member 5, a second mold member 6,
It is a timing chart showing the operation timing of each part of the cutting blade 4 and the cutting member 7, and the horizontal axis shows the time T. The operation timing of these operating parts can be controlled by a controller (not shown) connected to each operating part.

第２図はプレス成形直前の状態であり、第１及び第２の
型部材５、６は所定の間隔を有し、切断リング７の先端
部７ａは第２の型部材６の成形面６ａに対して長さＬだ
け突出した状況にある。このような型部材５と型部材６
及び切断リング７の開口部についてノズル１からガラス
流体２が流下している。このガラス流体２の先端、即ち
切断跡３が対向する各成形面５ａ，６ａより下方に流下
した時点で、第１及び第２のシリンダー１３、１６を駆
動して第１及び第２の型部材５、６の押圧動作を開始す
る。この押圧動作において、切断リング７は型部材６に
対する相対位置を維持したまま、即ち切断リング７の先
端部７ａは型部材６の成形面６ａから突出長さＬを維持
したまま該型部材６とともに移動する。従って、第３図
に示すように、型部材５、６がガラス流体２に対する押
圧動作を開始した時点において、既に被成形部２１の外
周側面の端部２１ａは切断リング７の先端部７ａによっ
て切断分離された状況にある。FIG. 2 shows a state immediately before press molding, in which the first and second mold members 5 and 6 have a predetermined distance, and the tip portion 7a of the cutting ring 7 is formed on the molding surface 6a of the second mold member 6. On the other hand, it is in a situation where the length L is projected. Such mold member 5 and mold member 6
Further, the glass fluid 2 flows down from the nozzle 1 through the opening of the cutting ring 7. At the time when the tip of the glass fluid 2, that is, the cutting trace 3 flows down from the opposing molding surfaces 5a and 6a, the first and second cylinders 13 and 16 are driven to drive the first and second mold members. The pressing operation of 5 and 6 is started. In this pressing operation, the cutting ring 7 maintains its relative position with respect to the mold member 6, that is, the tip end portion 7a of the cutting ring 7 maintains the protruding length L from the molding surface 6a of the mold member 6 together with the mold member 6. Moving. Therefore, as shown in FIG. 3, when the mold members 5 and 6 start the pressing operation against the glass fluid 2, the end portion 21 a of the outer peripheral side surface of the molded portion 21 is already cut by the tip portion 7 a of the cutting ring 7. They are in separate situations.

第８図においてＴ＝０はこの両型部材５，６の作動開始
時期を示す。これら型部材５，６の作動開始時期は双方
において同時でよいが、型部材５，６のガラス流体２に
対する押圧動作終了時期Ｔ２は双方において同時か多く
とも±０．０５ｓの誤差に収めるのが好ましい。この誤
差が大きいと型部材５、６の片方のみがガラス流体２に
衝突して該ガラス流体２に横ブレが生じ好ましくない。
その後、型部材５，６は、第３図及び第４図に示すよう
に、ガラス流体２の被成形部２１を押圧したままの状態
を所定時間（Ｔ２〜Ｔ６）保ち、この間被成形部２１の
両表面に対して夫々の成形面５ａ，６ａによる押圧転写
が行なわれる。In FIG. 8, T = 0 indicates the operation start timing of both mold members 5 and 6. The operation start timing of these mold members 5 and 6 may be the same at both times, but the pressing operation end timing T 2 of the mold members 5 and 6 against the glass fluid 2 is the same at both times or at most within an error of ± 0.05 s. Is preferred. If this error is large, only one of the mold members 5 and 6 collides with the glass fluid 2 and the glass fluid 2 is laterally shaken, which is not preferable.
After that, the mold members 5 and 6 maintain the state where the glass fluid 2 is pressed against the molded portion 21 of the glass fluid 2 for a predetermined time (T 2 to T 6 ), as shown in FIG. 3 and FIG. Press transfer is performed on both surfaces of the portion 21 by the respective molding surfaces 5a and 6a.

切断刃４の作動開始時期は、型部材５，６の作動開始時
期Ｔ＝０と同時であってよいが、この切断刃４によるガ
ラス流体２の切断終了時期Ｔ２は型部材５，６がガラス
流体２を保持すると同時か少なくとも保持した後でなけ
ればならない。The operation start time of the cutting blade 4 may be the same as the operation start time T = 0 of the mold members 5 and 6, but the cutting end time T 2 of the glass fluid 2 by the cutting blade 4 is set to the mold members 5 and 6. It must be at the same time as holding the glass fluid 2 or at least after holding it.

その後、切断刃４は元の状態に復帰せしめられる。第８
図には、この切断刃４の復帰開始時期をＴ４とし、復帰
終了時期をＴ５として示してある。好ましくは、切断刃
４の作動開始時期Ｔ＝０から復帰開始時期Ｔ４までに要
する時間を０．３〜０．４ｓとする。After that, the cutting blade 4 is returned to the original state. 8th
In the figure, the recovery start time of the cutting blade 4 is shown as T 4 , and the recovery end time is shown as T 5 . Preferably, the 0.3~0.4s the time required from the operation starting time T = 0 of the cutting blade 4 to return starting time T 4.

切断リング７の作動開始時期Ｔ１は、第５図に示すよう
に、少なくとも切断リング７による被成形部２１の外周
切断終了（Ｔ３）前に切断刃４によるガラス流体２の切
断が終了（Ｔ２）した状態となるように設定する必要が
ある。こうすることにより、切断リング７の切断動作が
完了した時点においてガラス流体２は切断刃４により既
に切り離された状態にあり、切断リング７で切り取られ
た切断片２２は容易に第１の型部材５の外方に移動する
ことができる。As shown in FIG. 5, at the operation start timing T 1 of the cutting ring 7, the cutting of the glass fluid 2 by the cutting blade 4 ends at least before the outer peripheral cutting (T 3 ) of the molded part 21 by the cutting ring 7 ends ( It is necessary to set so as to be in the state of T 2 ). By doing so, the glass fluid 2 is already separated by the cutting blade 4 at the time when the cutting operation of the cutting ring 7 is completed, and the cutting piece 22 cut by the cutting ring 7 can be easily cut by the first mold member. You can move out of 5.

かくして、切断リング７は第２の型部材６の外周に沿っ
て摺動しつつ被成形部２１の外周側面（ただし、上記し
た切断リング７の先端部７ａにより切断分離されなかっ
た被成形部２１の外周）を切断し、該被成形部２１の外
周側面の形状を形成する。Thus, the cutting ring 7 slides along the outer periphery of the second mold member 6 while the outer peripheral side surface of the molded portion 21 (however, the molded portion 21 that has not been cut and separated by the above-mentioned tip portion 7a of the cutting ring 7). The outer periphery) is cut to form the shape of the outer peripheral side surface of the molded portion 21.

その後、切断リング７は切断終了時（Ｔ３）の状態を維
持し、被成形部２１の外周側面を保持したままその温度
差により被成形部２１を外周から冷却し、該被成形部２
１の外周付近は粘度を増してその形状が定着する。一
方、型部材５，６による押圧後、該型部材と被成形部２
１の温度差により該被成形部２１は両表面から冷却され
て粘度を増し、表面形状が安定化する。After that, the cutting ring 7 maintains the state at the end of cutting (T 3 ), and while the outer peripheral side surface of the molded portion 21 is held, the molded portion 21 is cooled from the outer periphery by the temperature difference, and the molded portion 2
In the vicinity of the outer periphery of No. 1, the viscosity is increased and its shape is fixed. On the other hand, after being pressed by the mold members 5 and 6, the mold member and the molded part 2
Due to the temperature difference of 1, the molded part 21 is cooled from both surfaces, the viscosity is increased, and the surface shape is stabilized.

次いで、第６図に示すように、第１の型部材５を元の状
態に復帰する。この作動開始時期をＴ６とし、作動終了
時期をＴ７とし、切断リング７の元の状態に作動する開
始時期を第１の型部材５の復帰終了時期Ｔ７と同時かそ
の終了後とすると、切断リング７の作動開始前において
被成形部２１は該切断リング７により保持された状態に
あり、自然に落下することがない。そして、切断リング
７の復帰終了時期Ｔ８と同時に、被成形部即ち成形品２
３を取出す。これは、周知の吸着ハンド等を用いて行な
うことができる。この取出し作業の終了後、第２の型部
材６を元の状態に復帰せしめる。第８図には、この第２
の型部材６の復帰開始時期をＴ９とし、復帰終了時期を
Ｔ10としてある。Then, as shown in FIG. 6, the first mold member 5 is returned to the original state. When the operation start time is T 6 , the operation end time is T 7, and the start time for the cutting ring 7 to operate in the original state is the same as or after the return end time T 7 of the first mold member 5. Before the start of the operation of the cutting ring 7, the molded part 21 is held by the cutting ring 7 and does not fall naturally. Then, at the same time as the recovery end time T 8 of the cutting ring 7, the portion to be molded, that is, the molded product 2
Take out three. This can be performed using a known suction hand or the like. After the completion of this take-out work, the second mold member 6 is returned to its original state. In FIG. 8, this second
The return start timing of the mold member 6 is T 9 and the return end timing is T 10 .

以上のような動作において、切断リング７の先端部７ａ
は型部材６の成形面６ａから突出長さＬを維持したまま
該型部材６の押圧動作とともに移動し、型部材５、６が
ガラス流体２に対する押圧動作を開始した時点におい
て、既に被成形部２１の外周側面の端部２１ａは切断リ
ング７の先端部７ａによって切断分離された状況にある
から、プレス成形後に被成形部２１の外周についてその
外表面から新たに切断するような場合とは異なり、成形
品外周端部にワレ、ヒビ或はガラスクズを生じることが
ない。In the above operation, the tip portion 7a of the cutting ring 7
Moves with the pressing operation of the mold member 6 while maintaining the protruding length L from the molding surface 6a of the mold member 6, and when the mold members 5 and 6 start the pressing operation against the glass fluid 2, the part to be molded is already formed. Since the end portion 21a of the outer peripheral side surface of 21 is cut and separated by the tip portion 7a of the cutting ring 7, unlike the case where the outer periphery of the molded portion 21 is newly cut from its outer surface after press molding. No cracks, cracks or glass debris are formed on the outer peripheral edge of the molded product.

なお、上記切断リング７の先端部７ａの突出長さＬは、
成形品のコバ厚が２mm程度までの薄肉の場合、０、１〜
１mm程度とするのが適当である。突出長さＬが０、１mm
より小さいと、上記のような被成形部２１全体の外周側
面を切断分離する以前に切断リング７の先端部７ａによ
り該被成形部２１の外周端部２１ａを切断分離する効果
があまり期待できない。又、突出長さＬが１mmより大き
いとコバ厚が２mm程度の成形品のプレス成形の最中に余
剰ガラス２２のはみ出る空隙を付与することができなく
なり、成形品の重量精度に誤差が生じてしまう。The protrusion length L of the tip portion 7a of the cutting ring 7 is
If the edge thickness of the molded product is thin up to about 2 mm, 0, 1-
It is suitable to set it to about 1 mm. Projection length L is 0, 1 mm
If it is smaller, the effect of cutting and separating the outer peripheral end portion 21a of the molded portion 21 by the tip portion 7a of the cutting ring 7 before cutting and separating the outer peripheral side surface of the entire molded portion 21 as described above cannot be expected so much. Further, if the protrusion length L is larger than 1 mm, it is not possible to provide a void through which the surplus glass 22 protrudes during press molding of a molded product having an edge thickness of about 2 mm, which causes an error in the weight accuracy of the molded product. I will end up.

又、成形品のコバ厚が２mm以上の厚肉の場合、切断リン
グ７の先端部７ａの突出長さＬを余剰ガラスのはみ出る
空隙が、０、５〜２mm程度となるようにするのが適当で
ある。このように厚肉の成形品をプレス成形する場合、
切断リング７の先端部７ａの突出長さＬを上記の作用効
果を発揮できる充分な長さだけ確保することができ、プ
レス成形の際においても余剰ガラス２２のはみ出る空隙
を必要量確保することが可能となる。Further, when the edge thickness of the molded product is 2 mm or more, it is appropriate to set the protruding length L of the tip portion 7a of the cutting ring 7 so that the gap where the excess glass protrudes is about 0.5 to 5 mm. Is. When press-molding such a thick molded product,
The protruding length L of the tip end portion 7a of the cutting ring 7 can be secured as long as the above-mentioned effects can be exhibited, and a necessary amount of the protruding glass 22 can be secured even during press molding. It will be possible.

なお、上述したように、特に肉厚の厚い成形品の外周側
面を切断する場合において、該外周端部にカケやガラス
クズが生じやすいことを考慮すると、本発明は特に肉厚
の厚い成形品についてその効果を発揮するから好都合で
ある。As described above, in the case of cutting the outer peripheral side surface of a particularly thick molded product, considering that chipping or glass debris is likely to occur at the outer peripheral end, the present invention relates to a particularly thick molded product. It is convenient because it exerts its effect.

本実施例における他の効果としては、成形用型５，６に
よるプレス成形は、ガラス流体２の先端即ち切断跡３を
除いた部分に対して行なわれるため、得られた成形品２
３にシャーマーク等の表面欠陥が生じない。Another effect of this embodiment is that the press molding by the molding dies 5 and 6 is performed on the portion of the glass fluid 2 excluding the tip, that is, the cut mark 3, so that the obtained molded product 2 is obtained.
No surface defect such as a shear mark is generated in 3.

又、成形用型５，６により形成されるキャビティは、各
シリンダー１３，１６のストロークにより設定すること
ができる。即ち、設定されたシリンダー１３，１６のス
トロークによって、押圧終了時期Ｔ２における成形用型
５，６の成形面間隔が決まる。成形品２３の肉厚はこの
成形面間隔により決定されるものであるから、シリンダ
ー１３，１６のストロークを製造すべき成形品２３の肉
厚に応じて設定することにより常に所定の肉厚を有する
成形品が得られる。The cavity formed by the molding dies 5 and 6 can be set by the stroke of the cylinders 13 and 16. That is, the set strokes of the cylinders 13 and 16 determine the molding surface spacing of the molding dies 5 and 6 at the pressing end time T 2 . Since the wall thickness of the molded product 23 is determined by this molding surface distance, the stroke of the cylinders 13 and 16 is set according to the wall thickness of the molded product 23 to be manufactured, so that the molded product 23 always has a predetermined wall thickness. A molded product is obtained.

又、成形品２３の表面形状及び性状は各成形部材５，６
の夫々の成形面５ａ，６ａにより決まる。The surface shape and properties of the molded product 23 are the same as those of the molded members 5, 6
Of the molding surfaces 5a and 6a.

なお、以上説明したプレス成形装置に適用されるガラス
流体として、溶融炉からノズルを介して流出する溶融ガ
ラスが用いてあるが、既に成形加工されたロッド或いは
シート状のガラス材料を再加熱することにより流動性を
有するようにされた軟化ガラス材料を成形用型の間に挿
入することにより使用することもできる。As the glass fluid applied to the press molding apparatus described above, the molten glass flowing out from the melting furnace through the nozzle is used, but it is necessary to reheat the already molded rod or sheet glass material. It is also possible to use a softened glass material which is made to have fluidity by inserting it between molding dies.

次に、上述のようなプレス成形法を用いて特に肉厚の厚
い光学レンズをプレス成形する具体的実施例について説
明する。Next, a specific example of press-molding an especially thick optical lens using the above-described press-molding method will be described.

この実施例においては、通常カメラレンズ等に用いられ
る光学ガラスＦ８（Ｔｇ＝４４５℃、比重3.36）の溶融
ガラスを用い、中心肉厚４mm、コバ厚3.08mm、曲率がＲ
１＝Ｒ２＝１０mm、ガラス容量0.100cc、重量が３３７m
gの両凸形状のリヒートプレス用プリフォームの成形を
行なった。型部材５，６としては、ＳＵＳ３１０Ｓ又は
インコネルにより形成し、又切断リング７はＳＫ３によ
り形成し、型温が３７５℃（Ｆ８のＴｇ４４５℃より７
０℃低い温度）となるようヒーター８，９の調整を行な
った。In this embodiment, a fused glass of optical glass F8 (Tg = 445 ° C., specific gravity 3.36) usually used for a camera lens or the like is used, and the center thickness is 4 mm, the edge thickness is 3.08 mm, and the curvature is R.
1 = R 2 = 10mm, glass capacity 0.100cc, weight 337m
A biconvex shape preform for reheat press of g was molded. The mold members 5 and 6 are formed of SUS310S or Inconel, and the cutting ring 7 is formed of SK3, and the mold temperature is 375 ° C (Tg of F8 is 445 ° C.
The heaters 8 and 9 were adjusted so that the temperature became 0 ° C. lower).

さらに、不図示の溶融炉にて溶融されたガラスをガラス
流体２の粘度が102.95〜103.1ポアズ（１０８０℃〜１
０５０℃）となるように調整した。Further, the glass fluid 2 has a viscosity of 10 2.95 to 10 3.1 poise (1080 ° C to 1
050 ° C.).

そして、切断リング７の先端部７の突出長さＬを２、８
mmとし、各シリンダー１３，１６，１７の作動圧力を夫
々５０kg，２００kg，５０kgに設定して、上記の方法に
よりプレス成形及び切断処理を行ない、成形品２３の内
部粘度が109ポアズ（約５４０℃）になったところで第
２の型部材６から取り出したところ、得られた成形品２
３は、所望の成形品に対して外径精度で±0.01mm、中心
肉厚で±0.02、重量で±３mg（±0.9％）のバラツキ内
に収り、表面中心部のヒケも平均４０μｍ程度のもので
あり、又、成形品外周角部の仕上り具合も良好で、あま
り精度を要求されないリヒート用プリフォームとしては
十分使用できるのものであった。Then, the protruding length L of the tip portion 7 of the cutting ring 7 is set to 2, 8
mm, the operating pressure of each cylinder 13, 16, 17 is set to 50 kg, 200 kg, 50 kg, respectively, and press molding and cutting are performed by the above method, and the internal viscosity of the molded product 23 is 10 9 poise (about 540 (° C), it was taken out from the second mold member 6 and the obtained molded product 2
3 is within ± 0.01 mm in outer diameter accuracy, ± 0.02 in center wall thickness, ± 3 mg (± 0.9%) in weight, and average sink mark of the surface is about 40 μm for the desired molded product. In addition, the finish of the outer peripheral corners of the molded product was good, and it could be sufficiently used as a reheat preform that does not require much precision.

（発明の効果） 以上説明したように、本発明によれば、成形品の外周は
型部材の外周に設けられた切断部材により切断され形成
されるが、成形用型部材の外周に設けられた切断部材の
先端部は型部材の成形面よりやや突出した状態にしてプ
レス成形される。従って、成形品の外周角部の形状は切
断部材の先端内周により成形され、切断部材の成形品外
周側面全体に対する切断は成形品外周の角部からやや側
部に入った部分から開始される。このため、成形品の外
周角部は切断部材の切断動作に影響されることがなく、
該外周角部にカケやガラス粉を発生せず、外形形状が良
好でかつ重量精度が正確な成形品を得ることができる。(Effects of the Invention) As described above, according to the present invention, the outer periphery of the molded product is cut and formed by the cutting member provided on the outer periphery of the die member, but the outer periphery of the molding die member is provided. The tip of the cutting member is press-molded in a state of slightly protruding from the molding surface of the mold member. Therefore, the shape of the outer peripheral corner of the molded product is formed by the inner periphery of the tip of the cutting member, and the cutting of the entire outer peripheral side surface of the molded product of the cutting member is started from the part slightly inside the outer peripheral corner of the molded product. . Therefore, the outer peripheral corner of the molded product is not affected by the cutting operation of the cutting member,
It is possible to obtain a molded product having a good outer shape and accurate weight accuracy without generating chips or glass powder at the outer peripheral corners.

【図面の簡単な説明】[Brief description of drawings]

第１図（ａ）は本発明の実施例を示すプレス成形装置の
概略的断面図である。 第１図（ｂ）は第１図（ａ）のＡ−Ａ線に沿う断面図で
ある。 第２図〜第７図は第１図に示す装置の要部断面図であ
り、同装置の工程順の作動状態が示してある。 第８図は第１図に示すプレス成形装置の各作動部のタイ
ミングチャートを示す図である。 １……ノズル ２……ガラス流体 ３……切断跡 ４……切断刃 ５……第１の型部材 ６……第２の型部材 ７……切断部材 ７ａ……切断部材の先端部 ２１……被成形部 ２２……切断片 ２３……成形品FIG. 1 (a) is a schematic sectional view of a press molding apparatus showing an embodiment of the present invention. FIG. 1 (b) is a sectional view taken along the line AA of FIG. 1 (a). 2 to 7 are cross-sectional views of the main part of the apparatus shown in FIG. 1, showing the operating state of the apparatus in the order of steps. FIG. 8 is a diagram showing a timing chart of each operating part of the press molding apparatus shown in FIG. 1 ... Nozzle 2 ... Glass fluid 3 ... Cutting trace 4 ... Cutting blade 5 ... First mold member 6 ... Second mold member 7 ... Cutting member 7a ... Tip of cutting member 21 ... … Molded part 22 …… Cut piece 23 …… Molded product

Claims (3)

【特許請求の範囲】[Claims] 【請求項１】ガラス流体を狭むように対向配置された一
対の成形用型部材を前記ガラス流体に対し略直角方向か
ら押圧して被成形部の機能面を形成するとともに、前記
型部材の外周に設けられ該型部材の外周に沿って摺動せ
しめることにより前記被成形部の外周側面を切断する光
学素子の成形方法において、前記切断部材の先端部を前
記成形用型の成形面よりやや突出した状態で前記型部材
を前記被成形部に対し押圧し、次いで前記切断部材を作
動させて前記被成形部の外周側面を切断することを特徴
とする光学素子の成形方法。1. A pair of molding die members opposed to each other so as to narrow a glass fluid is pressed from a direction substantially perpendicular to the glass fluid to form a functional surface of a molded portion, and at the outer periphery of the die member. In a method of molding an optical element in which an outer peripheral side surface of the molded portion is cut by sliding along the outer periphery of the mold member provided, the tip end of the cutting member is slightly projected from the molding surface of the molding die. In the state, the mold member is pressed against the molding target portion, and then the cutting member is operated to cut the outer peripheral side surface of the molding target portion. 【請求項２】前記ガラス流体がガラス溶融炉の流出ノズ
ルから流下する溶融ガラス流であることを特徴とする特
許請求の範囲第１項記載の光学素子の成形方法。2. The method for molding an optical element according to claim 1, wherein the glass fluid is a molten glass flow that flows down from an outflow nozzle of a glass melting furnace. 【請求項３】前記ガラス流体が再加熱されたロッド又は
シート状のガラス材料から成ることを特徴とする特許請
求の範囲第１項記載の光学素子の成形方法。3. The method for molding an optical element according to claim 1, wherein the glass fluid is made of a reheated rod-shaped or sheet-shaped glass material.
JP3540188A 1988-02-19 1988-02-19 Optical element molding method Expired - Lifetime JPH0629147B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3540188A JPH0629147B2 (en) 1988-02-19 1988-02-19 Optical element molding method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3540188A JPH0629147B2 (en) 1988-02-19 1988-02-19 Optical element molding method

Publications (2)

Publication Number Publication Date
JPH01212238A JPH01212238A (en) 1989-08-25
JPH0629147B2 true JPH0629147B2 (en) 1994-04-20

Family

ID=12440891

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3540188A Expired - Lifetime JPH0629147B2 (en) 1988-02-19 1988-02-19 Optical element molding method

Country Status (1)

Country Link
JP (1) JPH0629147B2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5322541A (en) * 1991-03-28 1994-06-21 Matsushita Electric Industrial Co., Ltd. Method of producing glass blank
JP2012160252A (en) * 2011-01-31 2012-08-23 Hoya Corp Method for manufacturing glass substrate for magnetic disk

Also Published As

Publication number Publication date
JPH01212238A (en) 1989-08-25

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