JPH1190964A - Injection molding die and injection molding method - Google Patents
Injection molding die and injection molding methodInfo
- Publication number
- JPH1190964A JPH1190964A JP25896497A JP25896497A JPH1190964A JP H1190964 A JPH1190964 A JP H1190964A JP 25896497 A JP25896497 A JP 25896497A JP 25896497 A JP25896497 A JP 25896497A JP H1190964 A JPH1190964 A JP H1190964A
- Authority
- JP
- Japan
- Prior art keywords
- piece
- thermal expansion
- mirror
- template
- mirror surface
- 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.)
- Granted
Links
Landscapes
- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、光学レンズ等のよ
うに比較的高い精度が要求される部品を容易にかつ高精
度に成形することができる射出成形金型及び射出成形方
法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection mold and an injection molding method capable of easily and accurately molding a part requiring relatively high precision, such as an optical lens.
【０００２】[0002]
【従来の技術】光学レンズを射出成形する金型において
は、光学面を精度良く成形するため、鏡面駒を使用して
いる。図６はこのような鏡面駒を備えた射出成形金型を
示し、対向する一対の型板１１０及び１２０に取付孔１
１０ａ及び１２０ａが形成され、それぞれの取付孔１１
０ａ、１２０ａに鏡面駒１３０、１４０が取り付けられ
ており、鏡面駒１３０、１４０の間がキャビティ１５０
となっている。2. Description of the Related Art In a mold for injection molding an optical lens, a mirror surface piece is used in order to accurately mold an optical surface. FIG. 6 shows an injection mold having such a mirror piece, and a pair of opposed mold plates 110 and 120 is provided with a mounting hole 1.
10a and 120a are formed and the respective mounting holes 11
0a and 120a are provided with mirror pieces 130 and 140, and a cavity 150 is provided between the mirror pieces 130 and 140.
It has become.
【０００３】鏡面駒１３０、１４０はキャビティ１５０
に臨む面が鏡面成形部１３０ａ、１４０ａとなってお
り、光学レンズの光学面を高精度で成形することができ
る。これに対し、高精度が要求されないレンズの外周部
は、型板１１０、１２０側に成形部１７０を設けて成形
している。２００は溶融樹脂が供給されるスプール、２
１０は溶融樹脂をキャビティ１５０に射出するランナー
である。The mirror pieces 130 and 140 have a cavity 150.
Are formed as mirror-surface forming portions 130a and 140a, and the optical surface of the optical lens can be formed with high accuracy. On the other hand, the outer peripheral portion of the lens, which does not require high precision, is formed by providing a forming portion 170 on the template 110, 120 side. 200 is a spool to which the molten resin is supplied, 2
A runner 10 injects the molten resin into the cavity 150.
【０００４】かかる鏡面駒１３０、１４０においては、
型板１１０、１２０への取り付けを容易にするため、型
板１１０、１２０の取付孔１１０ａ、１２０ａとの間に
２〜５μｍのクリアランス１８０が設けられている。と
ころが、このようなクリアランス１８０を設けた構造で
は、成形される光学レンズの偏芯精度をクリアランス１
８０以上に向上させることができないと共に、光軸がず
れたり、大きなバリが生じる不都合がある。In such mirrored pieces 130 and 140,
To facilitate attachment to the templates 110, 120, a clearance 180 of 2 to 5 μm is provided between the template 110, 120 and the mounting holes 110a, 120a. However, in the structure having such a clearance 180, the eccentricity of the optical lens to be formed is reduced by the clearance 1
It cannot be improved to 80 or more, and there is a disadvantage that the optical axis is shifted or a large burr is generated.
【０００５】特開平２−２０６５２３号公報には、この
ような不都合を解消する従来の射出成形金型が記載され
ている。この射出成形金型は、キャビティの一部を構成
する内駒の外側に外駒を設けると共に、内駒を外駒より
熱膨張率の大きな材質によって成形した構造となってい
る。[0005] Japanese Patent Application Laid-Open No. 2-206523 describes a conventional injection mold for solving such a disadvantage. This injection molding die has a structure in which an outer piece is provided outside an inner piece that forms a part of the cavity, and the inner piece is formed of a material having a higher coefficient of thermal expansion than the outer piece.
【０００６】この射出成形金型では、溶融樹脂の射出工
程前においては内駒と外駒との間の摺動部にクリアラン
スを有している。これに対し、射出工程では金型内に射
出された溶融樹脂により金型が加熱されて高温になるこ
とにより、内駒が膨張する。この膨張によって、射出工
程前の内駒と外駒との間の摺動部におけるクリアランス
が完全に密閉された状態となり、内駒と外駒とが完全に
固定された嵌合状態となる。これにより、内駒と外駒と
の中心軸が一致した状態になり、偏芯精度の高い成形品
を成形することができる。In this injection molding die, a clearance is provided in a sliding portion between the inner piece and the outer piece before the injection step of the molten resin. On the other hand, in the injection step, the mold is heated by the molten resin injected into the mold and becomes high temperature, so that the inner piece expands. Due to this expansion, the clearance in the sliding portion between the inner piece and the outer piece before the injection step is completely sealed, and the inner piece and the outer piece are completely fitted. As a result, the center axes of the inner piece and the outer piece are aligned, and a molded article with high eccentricity can be formed.
【０００７】[0007]
【発明が解決しようとする課題】しかしながら、上述し
た従来の射出成形金型では、射出樹脂による温度変化に
よってのみ内駒を膨張させるため、クリアランスが必要
以上に大きい場合には外駒と内駒とを完全な密閉状態に
保つことができない。また、内駒が鏡面駒である場合に
は、密閉時における外駒からの圧縮作用により、鏡面成
形部の面精度が劣化する問題を有している。However, in the above-mentioned conventional injection molding die, the inner piece is expanded only by a temperature change due to the injection resin. Therefore, if the clearance is unnecessarily large, the outer piece and the inner piece need to be expanded. Cannot be kept completely sealed. Further, when the inner piece is a mirror piece, there is a problem that the surface accuracy of the mirror-shaped part is deteriorated due to the compressing action from the outer piece at the time of sealing.
【０００８】本発明は、このような従来の問題点を考慮
してなされたものであり、請求項１、２の発明は、型板
と鏡面駒との間のクリアランスを確実に密閉させ、しか
も偏芯が極めて少ない状態で成形することができる射出
成形金型を提供する事を目的とする。The present invention has been made in consideration of such a conventional problem, and the inventions of claims 1 and 2 ensure that the clearance between the template and the mirror piece is sealed, and It is an object of the present invention to provide an injection mold that can be formed with extremely little eccentricity.
【０００９】請求項３の発明は、請求項１または２の射
出成形金型を用いて、高精度に成形することができる射
出成形方法を提供することを目的とする。A third object of the present invention is to provide an injection molding method capable of performing high-precision molding using the injection mold of the first or second aspect.
【００１０】[0010]
【課題を解決するための手段】上記目的を達成するた
め、請求項１の発明の射出成形金型は、キャビティを形
成するための鏡面成形部を有し、クリアランスを有して
型板内に取り付けられた鏡面駒と、この鏡面駒及び型板
を加熱する加熱手段とを備え、前記鏡面駒が、前記鏡面
成形部を有した駒本体と、この駒本体の中心軸と中心軸
が一致した一体状態となっていると共に、駒本体の熱膨
張率よりも大きな熱膨張率の材質によって形成され、前
記加熱手段の加熱によって型板に優先的に密着して前記
クリアランスを消失するように熱膨張する熱膨張部材と
によって形成されていることを特徴とする。In order to achieve the above object, an injection molding die according to the present invention has a mirror surface forming portion for forming a cavity, and has a clearance inside a mold plate. A mirror piece attached, and heating means for heating the mirror piece and the template are provided, and the mirror piece has a mirror body formed with the mirror surface forming portion, and a center axis of the piece body coincides with a central axis of the piece body. It is made of a material having a coefficient of thermal expansion larger than that of the frame body while being in an integrated state, and thermally expands so that the clearance is lost by preferentially adhering to the template by heating of the heating means. And a thermal expansion member.
【００１１】請求項１の発明では、駒本体及び熱膨張部
材によって形成された鏡面駒が型板との間にクリアラン
スを有しているため、型板への組み込みを容易に行うこ
とができる。According to the first aspect of the present invention, since the mirror surface piece formed by the piece body and the thermal expansion member has a clearance between the piece and the template, it can be easily incorporated into the template.
【００１２】この組み込み状態で加熱されることによっ
て、熱膨張部材が優先的に膨張して型板に密着するた
め、熱膨張部材の中心軸が型板の中心軸と一致する。一
方、駒本体の中心軸と熱膨張部材の中心軸は予め一致し
ているため、鏡面駒全体の中心軸が型板の中心軸と一致
する。従って、偏芯が極めて少なくなるため、高精度に
射出成形することができる。When heated in this assembled state, the thermal expansion member expands preferentially and comes into close contact with the template, so that the central axis of the thermal expansion member coincides with the central axis of the template. On the other hand, since the center axis of the piece main body and the center axis of the thermal expansion member match in advance, the center axis of the entire mirror piece matches the center axis of the template. Therefore, since the eccentricity is extremely small, injection molding can be performed with high precision.
【００１３】請求項２の発明は、請求項１の発明であっ
て、前記駒本体及び熱膨張部材は、それぞれの中心軸が
一致するように組み付けられた状態で、外周部が同時に
切削加工されていることを特徴とする。According to a second aspect of the present invention, in the first aspect of the present invention, the outer peripheral portion is cut at the same time as the piece main body and the thermal expansion member are assembled so that their respective central axes coincide with each other. It is characterized by having.
【００１４】このように中心軸を一致させた組み立て状
態で外周部が切削加工されることにより、上述した請求
項１の作用を確実に行うことができる。Since the outer peripheral portion is cut in the assembled state in which the central axes are aligned in this manner, the above-described operation of claim 1 can be reliably performed.
【００１５】請求項３の発明の射出成形方法は、キャビ
ティを形成するための鏡面成形部を有した駒本体と、こ
の駒本体の中心軸と中心軸が一致した一体状態となって
いると共に、駒本体の熱膨張率よりも大きな熱膨張率の
材質によって形成された熱膨張部材とによって鏡面駒を
形成し、この鏡面駒を型板内にクリアランスを有して取
り付け、加熱によって前記熱膨張部材を膨張させて型板
に密着させ、この密着状態で溶融樹脂をキャビティ内に
射出して成形することを特徴とする。According to a third aspect of the present invention, there is provided an injection molding method, wherein a bridge body having a mirror surface forming portion for forming a cavity is integrated with a center axis of the bridge body so that the center axis coincides with the center axis. Forming a mirror-finished piece with a thermal expansion member formed of a material having a coefficient of thermal expansion greater than the thermal expansion coefficient of the piece body, mounting the mirror-faced piece in a template with a clearance, and heating the thermal expansion member Is expanded and brought into close contact with the template, and in this tight contact state, the molten resin is injected into the cavity and molded.
【００１６】請求項３の発明では、鏡面駒がクリアラン
スを有するように型板に組み込まれるため、型板への組
み込みを容易に行うことができる。また、加熱によって
熱膨張部材が膨張して型板に密着するため、鏡面駒の中
心軸と型板の中心軸とが一致する。そして、この状態で
溶融樹脂を射出するため、精度良く成形することができ
る。According to the third aspect of the present invention, since the mirror surface piece is incorporated into the template so as to have a clearance, it can be easily incorporated into the template. In addition, since the heat expansion member expands due to heating and comes into close contact with the template, the center axis of the mirror piece and the center axis of the template match. Since the molten resin is injected in this state, molding can be performed with high accuracy.
【００１７】[0017]
（実施の形態１）図１は本発明の実施の形態１の射出成
形金型を示し、固定型１及び可動型２を備えている。(Embodiment 1) FIG. 1 shows an injection mold according to Embodiment 1 of the present invention, which includes a fixed mold 1 and a movable mold 2.
【００１８】固定型１は、固定側取付板４に固定側型板
３が取り付けられることによって構成されている。これ
に対し可動型２は、可動側取付板７にスペーサ６を介し
て可動側型板５が取り付けられることによって構成され
ている。また、可動側取付板７には突出し板８が取り付
けられ、突出し板８に取り付けられたエジェクタピン１
９の先端が可動側型板５に摺動可能に挿入されている。The fixed mold 1 is constructed by attaching the fixed mold plate 3 to the fixed attachment plate 4. On the other hand, the movable mold 2 is configured by attaching the movable mold plate 5 to the movable attachment plate 7 via the spacer 6. A protruding plate 8 is mounted on the movable mounting plate 7, and the ejector pins 1 mounted on the protruding plate 8 are mounted on the movable side mounting plate 7.
9 is slidably inserted into the movable mold plate 5.
【００１９】固定側型板３及び可動側型板５には、円筒
状の取付孔１７、１８が対向するように形成されてお
り、これらの取付孔１７、１８には、円柱状の固定側鏡
面駒１５、可動側鏡面駒１６がそれぞれ取り付けられて
いる。これらの固定側鏡面駒１５及び可動側鏡面駒１６
はいずれも、室温下で２〜５μｍ程度のクリアランス３
１、３２を有してそれぞれの取付孔１７、１８に取り付
けられるものである。The stationary mold plate 3 and the movable mold plate 5 are formed with cylindrical mounting holes 17 and 18 so as to face each other. A mirror surface piece 15 and a movable side mirror surface piece 16 are respectively attached. These fixed-side mirror piece 15 and movable-side mirror piece 16
Are clearances of about 2 to 5 μm at room temperature.
1 and 32 to be attached to the respective attachment holes 17 and 18.
【００２０】固定側鏡面駒１５、可動側鏡面駒１６の対
向面は型締めされることによって成形用のキャビティ１
４を形成し、固定側鏡面駒１５の対向面が鏡面成形部１
４ａ、可動側鏡面駒１６の対向面が鏡面成形部１４ｂと
なっている。これらの鏡面成形部１４ａ、１４ｂによっ
て光学レンズの光学面が成形される。図示する形態で
は、鏡面成形部１４ａ、１４ｂは凹み状となっており、
両凸レンズを成形するが、凹凸の組み合わせは任意に変
更することができるものである。The opposing surfaces of the fixed-side mirror piece 15 and the movable-side mirror piece 16 are clamped to form a cavity 1 for molding.
4 and the facing surface of the fixed-side mirror surface piece 15 is
4a, the opposing surface of the movable side mirror surface piece 16 is a mirror surface forming portion 14b. The optical surface of the optical lens is formed by these mirror surface forming portions 14a and 14b. In the illustrated form, the mirror-shaped portions 14a and 14b are concave,
Although a biconvex lens is formed, the combination of the irregularities can be arbitrarily changed.
【００２１】固定側型板３及び可動側型板５には、加熱
手段としての温調孔２１、２２が形成されている。温調
孔２１、２２はそれぞれの鏡面駒１５、１６の周囲に形
成されており、熱流体が供給されることによって鏡面駒
１５、１６及び型板３、５を加熱する。The fixed mold plate 3 and the movable mold plate 5 are provided with temperature control holes 21 and 22 as heating means. The temperature control holes 21 and 22 are formed around the respective mirror pieces 15 and 16, and heat the mirror pieces 15 and 16 and the mold plates 3 and 5 by supplying a thermal fluid.
【００２２】固定側取付板４及び固定側型板３には、溶
融樹脂が供給されるスプール４０が貫通している。スプ
ール４０は可動側型板５の一部まで延びており、固定側
型板３及び可動側型板５の突き合わせ面には、スプール
４０と連通するランナー４１が形成され、このランナー
４１がキャビティ１４に連通している。なお、上述した
エジェクタピン１９の先端面はスプール４０に臨んでい
る。A spool 40 to which molten resin is supplied passes through the fixed-side mounting plate 4 and the fixed-side template 3. The spool 40 extends to a part of the movable mold plate 5, and a runner 41 communicating with the spool 40 is formed on an abutting surface of the fixed mold plate 3 and the movable mold plate 5. Is in communication with Note that the distal end surface of the above-described ejector pin 19 faces the spool 40.
【００２３】図２は鏡面駒１５、１６部分を拡大して示
しており、鏡面駒１５、１６は、いずれもキャビティ１
４側に位置する駒本体１５ａ、１６ａと、キャビティ１
４との反対側に位置する熱膨張部材１５ｂ、１６ｂとに
よって構成されている。これらは、いずれも平行度が精
度良く調整された円柱状に形成されて組み立てられてい
る。この場合、レンズの光学面を成形する鏡面成形部１
４ａ、１４ｂは駒本体１５ａ、１６ａに形成されてい
る。FIG. 2 shows the mirror pieces 15 and 16 in an enlarged manner.
4 and the cavity bodies 1a and 16a and the cavity 1
4 and thermal expansion members 15b and 16b located on the opposite side. These are all formed into a columnar shape whose parallelism is adjusted with high precision and assembled. In this case, the mirror surface forming unit 1 that forms the optical surface of the lens
4a and 14b are formed on the frame main bodies 15a and 16a.
【００２４】この実施の形態において、駒本体１５ａ、
１６ａ及び型板３、５は線膨張係数が室温下で１１．１
×１０-6／℃、成形温度下で（約１２０℃）で１１．６
×１０-6／℃のステンレス材料が使用されている。これ
に対し、熱膨張部材１５ｂ、１６ｂはこれらよりも熱膨
張率が大きな材質によって形成されており、この実施の
形態では、線膨張係数が室温下で約２２．０×１０-6／
℃、成形温度下で（約１２０℃）約２３．３×１０-6／
℃のアルミニウム材料が使用されている。In this embodiment, the frame body 15a,
16a and the mold plates 3 and 5 have a linear expansion coefficient of 11.1 at room temperature.
× 10 −6 / ° C., 11.6 at the molding temperature (about 120 ° C.)
A stainless steel material of × 10 -6 / ° C is used. On the other hand, the thermal expansion members 15b and 16b are made of a material having a higher coefficient of thermal expansion than these materials. In this embodiment, the linear expansion coefficient is about 22.0 × 10 −6 at room temperature.
℃, at molding temperature (about 120 ℃) about 23.3 × 10 -6 /
° C aluminum material is used.
【００２５】対応した駒本体及び熱膨張部材１５ａ及び
１５ｂ、１６ａ及び１６ｂは、ボルト等の締結部材２０
によって結合されることによって、鏡面駒１５、１６を
形成している。結合に際しては、駒本体１５ａ、１６ａ
の中心軸と対応した熱膨張部材１５ｂ、１６ｂの中心軸
とが相互に一致するように行われるものである。The corresponding piece main body and thermal expansion members 15a and 15b, 16a and 16b are connected to fastening members 20 such as bolts.
To form mirror surface pieces 15 and 16. At the time of joining, the piece main bodies 15a, 16a
And the central axes of the thermal expansion members 15b and 16b corresponding to the central axes are coincident with each other.
【００２６】また、駒本体１５ａ、１６ａ及び熱膨張部
材１５ｂ、１６ｂは締結部材２０によって結合された状
態で、それぞれの外周部が同時に切削加工されて仕上げ
られている。この切削加工では、外径が取付孔１７、１
８よりも約２〜５μｍ程度小さくなるように加工される
ものである。このような同時加工では、駒本体１５ａ、
１６ａの中心軸及び熱膨張部材１５ｂ、１６ｂの中心軸
がずれることがなく、中心軸の一致状態を確保すること
ができる。The bridge bodies 15a, 16a and the thermal expansion members 15b, 16b are connected to each other by a fastening member 20, and their outer peripheral portions are simultaneously cut and finished. In this cutting process, the outer diameter is set to the mounting holes 17, 1
It is processed to be smaller than about 8 by about 2 to 5 μm. In such simultaneous processing, the piece body 15a,
The central axis of 16a and the central axes of the thermal expansion members 15b and 16b do not shift, and the coincidence state of the central axes can be ensured.
【００２７】このような実施の形態では、固定側及び可
動側の鏡面駒１５、１６は、室温下（２２℃程度）にお
いて、各型板３、５に形成された取付孔１７、１８に対
し、外径が２〜５μｍ程度のクリアランス３１、３２を
有するように作成されているため、それぞれの取付孔１
７、１８に容易に取り付けることができる。In this embodiment, the fixed-side and movable-side mirror pieces 15, 16 are mounted at room temperature (about 22 ° C.) with respect to the mounting holes 17, 18 formed in the mold plates 3, 5. Are formed so as to have clearances 31 and 32 having an outer diameter of about 2 to 5 μm.
7 and 18 can be easily attached.
【００２８】この取り付け状態で、各温調孔２１、２２
に熱媒体を循環させ、成形温度まで昇温すると、各型板
３、５及び各鏡面駒１５、１６が熱膨張する。この熱膨
張では熱膨張部材１５ｂ、１６ｂの熱膨張率が大きいた
め、駒本体１５ａ、１６ａ及び型板３、５よりも大きく
膨張する。このため、図３に示すように熱膨張部材１５
ｂ、１６ｂは、駒本体１５ａ、１６ａよりも優先的に型
板３、５に密着して、クリアランス３１、３２を消失さ
せる。In this mounting state, each of the temperature control holes 21 and 22
When the temperature is raised to the molding temperature, the mold plates 3, 5 and the mirror pieces 15, 16 thermally expand. In this thermal expansion, since the thermal expansion coefficients of the thermal expansion members 15b and 16b are large, the thermal expansion members 15b and 16b expand more than the piece main bodies 15a and 16a and the template plates 3 and 5. For this reason, as shown in FIG.
The b and 16b are brought into close contact with the template plates 3 and 5 more preferentially than the frame main bodies 15a and 16a, so that the clearances 31 and 32 disappear.
【００２９】かかる密着によって、熱膨張部材１５ｂ、
１６ｂの中心軸が型板３、５の取付孔１７、１８の中心
軸に一致する。また、駒本体１５ａ、１６ａの中心軸
は、組み立て時に熱膨張部材１５ｂ、１６ｂの中心軸と
一致しているため、結果として型板３、５の取 付孔１
７、１８の中心軸と駒本体１５ａ、１６ａの中心軸とが
一致した状態となる。By such close contact, the thermal expansion member 15b,
The central axis of 16b coincides with the central axes of the mounting holes 17, 18 of the template 3,5. Also, since the center axes of the frame bodies 15a and 16a coincide with the center axes of the thermal expansion members 15b and 16b during assembly, the mounting holes 1 of the template plates 3 and 5 are consequently obtained.
The central axes of 7 and 18 are aligned with the central axes of the piece bodies 15a and 16a.
【００３０】従って、この状態で溶融樹脂をスプール４
０からキャビティ１４内に射出して成形することによっ
て、極めて偏芯が少なく、高精度の部品を成形すること
ができる。この成形後においては、型開きした後、突き
出し板８に連結されたエジェクタピン１９によって突き
出すことによって型外へ取り出す。Therefore, in this state, the molten resin is supplied to the spool 4.
By injecting and molding into the cavity 14 from 0, it is possible to mold a highly accurate part with extremely small eccentricity. After the molding, after the mold is opened, the mold is ejected by an ejector pin 19 connected to the ejection plate 8 and taken out of the mold.
【００３１】このような実施の形態では、金型使用温度
下において熱膨張部材１５ｂ、１６ｂが型板３、５の取
付孔１７、１８に密着するように構成しているため、極
めて偏芯の少ない金型とすることができる。また、鏡面
駒１５、１６の駒本体１５ａ、１６ａが型板３、５の取
付孔１７、１８と接触することがないため、圧縮変形に
よる鏡面駒１５、１６の面精度の劣化を防止することが
できる。In such an embodiment, since the thermal expansion members 15b and 16b are configured to be in close contact with the mounting holes 17 and 18 of the mold plates 3 and 5 at the mold operating temperature, the eccentricity is extremely high. The number of molds can be reduced. Further, since the frame bodies 15a, 16a of the mirror pieces 15, 16 do not contact the mounting holes 17, 18 of the template 3, 5, deterioration of the surface accuracy of the mirror pieces 15, 16 due to compression deformation is prevented. Can be.
【００３２】（実施の形態２）図４及び図５は、本発明
の実施の形態２を示し、実施の形態１と同一の部材は同
一の符号によって対応させてある。(Embodiment 2) FIGS. 4 and 5 show Embodiment 2 of the present invention, and the same members as those in Embodiment 1 are assigned the same reference numerals.
【００３３】この実施の形態においては、熱膨張率部材
１５ｂ、１６ｂがリング状となっている。リング状の熱
膨張部材１５ｂ、１６ｂは、高さおよび外径が同一で、
肉厚は少なくとも２〜３ｍｍ程度である。In this embodiment, the thermal expansion members 15b and 16b are ring-shaped. The ring-shaped thermal expansion members 15b and 16b have the same height and outer diameter,
The wall thickness is at least about 2-3 mm.
【００３４】一方、駒本体１５ａ、１６ａは、リング状
の熱膨張部材１５ｂ、１６ｂの高さよりも若干大きい幅
で、鏡面成形部１４ａ、１４ｂと反対側の底面１５ｅ、
１６ｅの外周に段差部１５ｃ、１６ｃが形成されてい
る。熱膨張部材１５ｂ、１６ｂはこの段差部１５ｃ、１
６ｃに嵌合することによって取り付けられている。な
お、底面１５ｅ、１６ｅの外径は熱膨張部材１５ｂ、１
６ｂの内径よりも若干大きくなるように設定されてい
る。この大きさは室温から金型使用温度まで昇温した際
に、熱膨張部材１５ｂ、１６ｂのリング内径が膨張する
量と同一かまたはそれ以上に相当している。On the other hand, the frame main bodies 15a, 16a have a width slightly larger than the height of the ring-shaped thermal expansion members 15b, 16b, and the bottom surfaces 15e, 15b on the opposite side to the mirror surface molded portions 14a, 14b.
Step portions 15c and 16c are formed on the outer periphery of 16e. The thermal expansion members 15b and 16b are connected to the step portions 15c and 1c.
6c. Note that the outer diameter of the bottom surfaces 15e and 16e is
6b is set to be slightly larger than the inner diameter. This size is equal to or greater than the amount by which the ring inner diameters of the thermal expansion members 15b and 16b expand when the temperature is raised from room temperature to the mold use temperature.
【００３５】各鏡面駒１５、１６の駒本体１５ａ、１６
ａと熱膨張部材１５ｂ、１６ｂとは、熱膨張部材１５
ｂ、１６ｂの内径が駒本体１５ａ、１６ａの外径よりも
若干大きくなる程度まで加熱した状態で互いに嵌合され
て組み立てられる。また、各型板３、５の取付孔１７、
１８と各駒本体１５ａ、１６ａとは底面１５ｅ、１６ｅ
で相互に接触するが、熱膨張部材１５ｂ、１６ｂと取付
孔１７、１８とは接触しないようになっている。さら
に、熱膨張部材１５ｂ、１６ｂのそれぞれの外径と内径
および駒本体１５ａ、１６ａの最外径と段差部１５ｃ、
１６ｃの外径はいずれも同時の切削加工により形成され
るものである。この実施の形態においても、駒本体１５
ａ、１６ａ及び熱膨張部材１５ｂ、１６ｂはその中心軸
が一致するように組み立てられる。The frame bodies 15a, 16 of the mirror surface pieces 15, 16
a and the thermal expansion members 15b and 16b
The members b and 16b are assembled together by being fitted to each other in a state where the members are heated to such a degree that the inner diameters thereof are slightly larger than the outer diameters of the block main bodies 15a and 16a. Also, the mounting holes 17 of each of the template plates 3 and 5,
18 and the main bodies 15a, 16a are connected to the bottom surfaces 15e, 16e.
, But the thermal expansion members 15b, 16b do not come into contact with the mounting holes 17, 18. Further, the outer diameter and inner diameter of each of the thermal expansion members 15b and 16b, and the outermost diameter and the step 15c of the piece main bodies 15a and 16a,
The outer diameter of 16c is formed by simultaneous cutting. Also in this embodiment, the piece body 15
a, 16a and the thermal expansion members 15b, 16b are assembled so that their central axes coincide.
【００３６】この実施の形態では、金型使用温度への昇
温により熱膨張部材１５ｂ、１６ｂが優先的に各型板
３、５の取付孔１７、１８と密着する。このとき熱膨張
部材１５ｂ、１６ｂの内周も膨張により拡大するが、各
駒本体１５ａ、１６ａと焼き嵌めによる圧入が施されて
いるため、両者間にクリアランスが発生することはな
い。また、各鏡面駒１５、１６の底面１５ｅ、１６ｅ
と、各型板３、５の取付孔１７、１８の底面との間にお
いてのみ、成形による圧力が作用するため、熱膨張部材
１５ｂ、１６ｂが塑性クリープ変形を生じることがな
い。In this embodiment, the thermal expansion members 15b and 16b preferentially come into close contact with the mounting holes 17 and 18 of the mold plates 3 and 5 by raising the temperature to the mold use temperature. At this time, the inner circumferences of the thermal expansion members 15b and 16b are also expanded by expansion, but no clearance is generated between the respective frame main bodies 15a and 16a because they are press-fitted by shrink fitting. Also, the bottom surfaces 15e, 16e of the respective mirror pieces 15, 16
And the pressure due to molding acts only between the mold plates 3 and 5 and the bottom surfaces of the mounting holes 17 and 18, so that the thermal expansion members 15b and 16b do not undergo plastic creep deformation.
【００３７】従って、この実施の形態では、熱膨張部材
１５ｂ、１６ｂに成形による圧力が直接加わらないた
め、クリープ変形を起こすことがなく、従って、常に安
定した寸法の成形品を成形することができる。Therefore, in this embodiment, since the pressure due to the molding is not directly applied to the thermal expansion members 15b, 16b, no creep deformation occurs, and therefore, a molded product having a stable dimension can be always formed. .
【００３８】[0038]
【発明の効果】以上説明したように、請求項１の発明に
よれば、駒本体及び熱膨張部材からなる鏡面駒が型板と
の間にクリアランスを有しているため、型板への組み込
みを容易に行うことができる。また、この鏡面駒は加熱
されることによって、熱膨張部材が優先的に膨張して型
板に密着し、鏡面駒の中心軸が型板の中心軸を一致する
ため、偏芯が極めて少なくなり、高精度に射出成形する
ことができる。As described above, according to the first aspect of the present invention, since the mirror piece consisting of the piece main body and the thermal expansion member has a clearance between the piece and the template, it can be incorporated into the template. Can be easily performed. Also, when this mirror surface piece is heated, the thermal expansion member expands preferentially and closely adheres to the template, and since the center axis of the mirror surface piece matches the center axis of the template, eccentricity is extremely reduced, Injection molding can be performed with high precision.
【００３９】請求項２の発明によれば、駒本体と熱膨張
部材の中心軸を一致させた組み立て状態で外周部が切削
加工されるため、これらの中心軸を確実に一致させるこ
とができる。According to the second aspect of the present invention, since the outer peripheral portion is cut in the assembled state in which the center axes of the block main body and the thermal expansion member are aligned, these central axes can be surely aligned.
【００４０】請求項３の発明によれば、鏡面駒がクリア
ランスを有するように型板に組み込まれるため、型板へ
の組み込みを容易に行うことができ、しかも、加熱によ
り熱膨張部材が膨張して型板に密着して鏡面駒の中心軸
と型板の中心軸とが一致するため、部品を精度良く射出
成形できる。According to the third aspect of the present invention, since the mirror surface piece is incorporated into the template so as to have a clearance, it can be easily incorporated into the template, and the thermal expansion member expands by heating. Since the center axis of the mirror piece and the center axis of the template coincide with each other in close contact with the template, parts can be injection molded with high precision.
【図１】本発明の実施の形態１の射出成形金型の部分断
面図である。FIG. 1 is a partial sectional view of an injection mold according to Embodiment 1 of the present invention.
【図２】実施の形態１の鏡面駒部分の拡大断面図であ
る。FIG. 2 is an enlarged sectional view of a mirror piece according to the first embodiment.
【図３】熱膨張した状態の鏡面駒部分の拡大断面図であ
る。FIG. 3 is an enlarged sectional view of a mirror surface piece in a thermally expanded state.
【図４】実施の形態２の鏡面駒部分の拡大断面図であ
る。FIG. 4 is an enlarged sectional view of a mirror surface piece according to the second embodiment.
【図５】熱膨張した状態の鏡面駒の拡大断面図である。FIG. 5 is an enlarged cross-sectional view of a mirror piece in a thermally expanded state.
【図６】光学レンズを成形する一般的な射出成形金型の
断面図である。FIG. 6 is a sectional view of a general injection molding die for molding an optical lens.
３ 固定側型板 ５ 可動側型板 １４ キャビティ １５ １６ 鏡面駒 １５ａ １６ａ 駒本体 １５ｂ １６ｂ 熱膨張部材 １７ １８ 取付孔 ２１ ２２ 温調孔 3 Fixed-side template 5 Movable-side template 14 Cavity 15 16 Mirror surface piece 15a 16a Frame body 15b 16b Thermal expansion member 17 18 Mounting hole 21 22 Temperature control hole
Claims (3)
を有し、クリアランスを有して型板内に取り付けられた
鏡面駒と、この鏡面駒及び型板を加熱する加熱手段とを
備え、 前記鏡面駒が、前記鏡面成形部を有した駒本体と、この
駒本体の中心軸と中心軸が一致した一体状態となってい
ると共に、駒本体の熱膨張率よりも大きな熱膨張率の材
質によって形成され、前記加熱手段の加熱によって型板
に優先的に密着して前記クリアランスを消失するように
熱膨張する熱膨張部材とによって形成されていることを
特徴とする射出成形金型。1. A mirror piece having a mirror surface forming part for forming a cavity, having a clearance and being mounted in a template with a clearance, and heating means for heating the mirror surface piece and the template. The mirror surface piece is a piece body having the mirror surface molded portion, and the center axis of the piece body is in an integrated state in which the center axis coincides with the piece body, and is made of a material having a coefficient of thermal expansion larger than that of the piece body. And a thermal expansion member which is formed and thermally expands such that the clearance is eliminated by preferentially adhering to the template by heating of the heating means.
の中心軸が一致するように組み付けられた状態で、外周
部が同時に切削加工されていることを特徴とする請求項
１記載の射出成形金型。2. The injection molding according to claim 1, wherein said piece main body and said thermal expansion member are assembled so that their respective central axes coincide with each other, and the outer peripheral portions are simultaneously cut. Mold.
を有した駒本体と、この駒本体の中心軸と中心軸が一致
した一体状態となっていると共に、駒本体の熱膨張率よ
りも大きな熱膨張率の材質によって形成された熱膨張部
材とによって鏡面駒を形成し、この鏡面駒を型板内にク
リアランスを有して取り付け、加熱によって前記熱膨張
部材を膨張させて型板に密着させ、この密着状態で溶融
樹脂をキャビティ内に射出して成形することを特徴とす
る射出成形方法。3. A piece main body having a mirror-finished portion for forming a cavity, an integral state in which the center axis of the piece body coincides with the central axis, and a coefficient of thermal expansion larger than the coefficient of thermal expansion of the piece body. A mirror surface piece is formed by a thermal expansion member formed of a material having a coefficient of thermal expansion, and the mirror surface piece is mounted with a clearance in a template, and the thermal expansion member is expanded by heating and brought into close contact with the template. An injection molding method characterized by injecting a molten resin into a cavity in this close contact state and molding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25896497A JP3850112B2 (en) | 1997-09-24 | 1997-09-24 | Injection mold and injection molding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25896497A JP3850112B2 (en) | 1997-09-24 | 1997-09-24 | Injection mold and injection molding method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1190964A true JPH1190964A (en) | 1999-04-06 |
| JP3850112B2 JP3850112B2 (en) | 2006-11-29 |
Family
ID=17327475
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25896497A Expired - Fee Related JP3850112B2 (en) | 1997-09-24 | 1997-09-24 | Injection mold and injection molding method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3850112B2 (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6282771B2 (en) * | 1999-11-23 | 2001-09-04 | Rosco Incorporated | Method for forming constant radius convex mirror assembly |
| JP2006137142A (en) * | 2004-11-15 | 2006-06-01 | Konica Minolta Opto Inc | Mold for optical element |
| JP2007260916A (en) * | 2006-03-27 | 2007-10-11 | Konica Minolta Opto Inc | Mold for injection-molding optical lens |
| JP2010042653A (en) * | 2008-08-11 | 2010-02-25 | Samsung Electro-Mechanics Co Ltd | Core mold |
| WO2011077934A1 (en) * | 2009-12-25 | 2011-06-30 | コニカミノルタオプト株式会社 | Mold and mold manufacturing method |
| WO2014034816A1 (en) * | 2012-08-31 | 2014-03-06 | コニカミノルタ株式会社 | Molding die manufacturing method, molding die, molding die regeneration method, and optical element manufacturing method |
| JP2016036837A (en) * | 2014-08-08 | 2016-03-22 | トヨタ自動車株式会社 | High-temperature molding die |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5313538B2 (en) * | 2008-04-10 | 2013-10-09 | リコー光学株式会社 | Injection mold and injection molding method |
-
1997
- 1997-09-24 JP JP25896497A patent/JP3850112B2/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6282771B2 (en) * | 1999-11-23 | 2001-09-04 | Rosco Incorporated | Method for forming constant radius convex mirror assembly |
| JP2006137142A (en) * | 2004-11-15 | 2006-06-01 | Konica Minolta Opto Inc | Mold for optical element |
| JP4513521B2 (en) * | 2004-11-15 | 2010-07-28 | コニカミノルタオプト株式会社 | Mold for optical parts |
| JP2007260916A (en) * | 2006-03-27 | 2007-10-11 | Konica Minolta Opto Inc | Mold for injection-molding optical lens |
| JP2010042653A (en) * | 2008-08-11 | 2010-02-25 | Samsung Electro-Mechanics Co Ltd | Core mold |
| WO2011077934A1 (en) * | 2009-12-25 | 2011-06-30 | コニカミノルタオプト株式会社 | Mold and mold manufacturing method |
| CN102666054A (en) * | 2009-12-25 | 2012-09-12 | 柯尼卡美能达先进多层薄膜株式会社 | Mold and mold manufacturing method |
| US20120248638A1 (en) * | 2009-12-25 | 2012-10-04 | Hiroyuki Matsuda | Molding dies and method for manufacturing said molding dies |
| JPWO2011077934A1 (en) * | 2009-12-25 | 2013-05-02 | コニカミノルタアドバンストレイヤー株式会社 | Mold and mold manufacturing method |
| WO2014034816A1 (en) * | 2012-08-31 | 2014-03-06 | コニカミノルタ株式会社 | Molding die manufacturing method, molding die, molding die regeneration method, and optical element manufacturing method |
| JP2016036837A (en) * | 2014-08-08 | 2016-03-22 | トヨタ自動車株式会社 | High-temperature molding die |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3850112B2 (en) | 2006-11-29 |
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