JP3253991B2 - Injection molding method - Google Patents
Injection molding methodInfo
- Publication number
- JP3253991B2 JP3253991B2 JP30382291A JP30382291A JP3253991B2 JP 3253991 B2 JP3253991 B2 JP 3253991B2 JP 30382291 A JP30382291 A JP 30382291A JP 30382291 A JP30382291 A JP 30382291A JP 3253991 B2 JP3253991 B2 JP 3253991B2
- Authority
- JP
- Japan
- Prior art keywords
- mold cavity
- pressurized fluid
- mold
- injection
- cavity wall
- 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
-
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
- B29C45/56—Means for plasticising or homogenising the moulding material or forcing it into the mould using mould parts movable during or after injection, e.g. injection-compression moulding
- B29C45/561—Injection-compression moulding
-
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
- B29C45/56—Means for plasticising or homogenising the moulding material or forcing it into the mould using mould parts movable during or after injection, e.g. injection-compression moulding
- B29C45/561—Injection-compression moulding
- B29C2045/563—Enlarging the mould cavity during injection
-
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
- B29C45/56—Means for plasticising or homogenising the moulding material or forcing it into the mould using mould parts movable during or after injection, e.g. injection-compression moulding
- B29C45/561—Injection-compression moulding
- B29C2045/5635—Mould integrated compression drive means
-
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
- B29C45/56—Means for plasticising or homogenising the moulding material or forcing it into the mould using mould parts movable during or after injection, e.g. injection-compression moulding
- B29C45/561—Injection-compression moulding
- B29C2045/5645—Resilient compression means
-
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/0025—Preventing defects on the moulded article, e.g. weld lines, shrinkage marks
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、射出成形方法に関する
もので、更に詳しくは、特に部分的に厚肉部を有する成
形型物の射出成形時に生じやすいヒケの防止に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection molding method, and more particularly to the prevention of sink marks which are liable to occur during injection molding of a mold having a partially thick portion.
【０００２】[0002]
【従来の技術】従来、射出成形において、金型キャビテ
ィ内の樹脂の冷却に伴う体積縮によって発生する表面の
くぼみ、即ちヒケを防止するために、金型キャビティ内
に過剰の溶融樹脂を射出することで、金型キャビティ内
の溶融樹脂を圧縮しておき、冷却による樹脂の体積収縮
と均衡させることが行われている（樹脂保圧法）。2. Description of the Related Art Conventionally, in injection molding, an excessive amount of molten resin is injected into a mold cavity in order to prevent surface depressions caused by volume reduction due to cooling of the resin in the mold cavity, ie, sink marks. Thus, the molten resin in the mold cavity is compressed, and the volume is contracted with the volume shrinkage of the resin due to cooling (resin pressure holding method).
【０００３】また、金型キャビティ内に射出された溶融
樹脂中に加圧流体を圧入し、加圧流体による内圧を加え
ながら金型キャビティ内の樹脂を冷却することも知られ
ている（中空成形法）。It is also known that a pressurized fluid is press-fitted into a molten resin injected into a mold cavity, and the resin in the mold cavity is cooled while applying internal pressure by the pressurized fluid (hollow molding). Law).
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、成形型
物が部分的に厚肉部を有する場合、冷却による樹脂の体
積収縮がその厚肉部に集中するため、上記樹脂保圧法や
中空成形法によっても、樹脂の種類や目的とする成形型
物のデザイン等によっては、極端なものではないにし
ろ、ヒケが発生してしまうことがある。特に、厚肉部の
幅を、その成形型物の基本的な肉厚（厚肉部以外の箇所
の肉厚）の２／３以上とした場合に発生しやすく、この
ような成形型物を、表面が鏡面あるいは表面に光沢のあ
る塗装を施した製品とすると、厚肉部の表面に反射した
像の歪みとしてヒケの存在が現れ、製品の高い品質要求
を満たすことができない問題がある。従って、このよう
な反射像の歪みを生じない高い品質が要求される製品に
ついては、厚肉部のデザインが制限されている。However, when the mold has a thick part partially, since the volume shrinkage of the resin due to cooling is concentrated on the thick part, the resin pressure-holding method or the hollow molding method is used. However, depending on the type of the resin, the design of the intended molding die, and the like, sink, though not extreme, may occur. In particular, when the width of the thick portion is set to 2/3 or more of the basic thickness (thickness of a portion other than the thick portion) of the molding, the molding tends to occur. If the product has a mirror-finished surface or a surface with a glossy coating, the presence of sink marks will appear as distortion of the image reflected on the surface of the thick portion, and there is a problem that high quality requirements for the product cannot be satisfied. Therefore, the design of the thick portion is limited for products that require high quality without causing such distortion of the reflection image.
【０００５】本発明は、このような従来の問題点に鑑み
てなされたもので、部分的に厚肉部を有する成形型物の
射出成形において、より確実にヒケの発生を防止できる
ようにすることを目的とする。SUMMARY OF THE INVENTION The present invention has been made in view of such conventional problems, and it is intended to more reliably prevent the occurrence of sink marks in the injection molding of a mold having a partially thick portion. The purpose is to:
【０００６】[0006]
【課題を解決するための手段及び作用】このために本発
明で講じられた手段を説明すると、図１及び図２に示さ
れるように、部分的に厚肉部を有する成形型物を成形す
る金型キャビティ１を有し、厚肉部成形部分２の金型キ
ャビティ壁部の少なくとも一部が、厚肉部形成部分２の
内外方向へ進退が可能な可動金型キャビティ壁部３とな
っており、この可動金型キャビティ壁部３を内方向へ押
圧する押圧手段４を有する射出成形用金型の金型キャビ
ティ内への溶融樹脂の射出と加圧流体の圧入を行う一
方、可動金型キャビティ壁部３を内方向に押圧し、金型
キャビティ１内の樹脂の冷却に伴う体積収縮と共に可動
金型キャビティ壁部３を前進させながら、金型キャビテ
ィ１内の溶融樹脂を冷却固化させることとしているもの
である。SUMMARY and action for solving] Describing the means are taken in the present invention for this, as shown in FIGS. 1 and 2, forming a partially mold having a thick portion At least a part of the mold cavity wall portion of the thick portion forming portion 2 which has the mold cavity 1 becomes a movable mold cavity wall portion 3 which can move in and out of the thick portion forming portion 2. cage, injection mold die cavity which have a pushing means 4 for pressing inward the movable mold cavity wall 3
Injection of molten resin and pressurized fluid
On the other hand, the movable mold cavity wall portion 3 is pressed inward to
Movable with volume shrinkage due to cooling of resin in cavity 1
While moving the mold cavity wall 3, the mold cavity
The molten resin in the cavity 1 is cooled and solidified .
【０００７】[0007]
【０００８】[0008]
【０００９】更に本発明を説明する。The present invention will be further described.
【００１０】図１及び図２に示されるように、本射出成
形用金型は、通常の射出成形用金型と同様に、固定型５
と移動型６で構成されており、固定型５は溶融樹脂の射
出路である樹脂通路７（スプルー、ランナー、ゲート
等）を備え、固定型５と移動型６の間には金型キャビテ
ィ１が形成されている。As shown in FIGS. 1 and 2, the present injection molding die has a fixed die 5 similar to a normal injection molding die.
The fixed mold 5 includes a resin passage 7 (a sprue, a runner, a gate, etc.) which is an injection path of the molten resin, and a mold cavity 1 is provided between the fixed mold 5 and the movable mold 6. Are formed.
【００１１】固定型５には、金型キャビティ１内への加
圧流体の圧入路である加圧流体通路８が形成されてい
る。この加圧流体通路８は、本射出成形用金型を用いて
中空成形法を行うに際し、樹脂通路７以外の箇所から加
圧流体の圧入を行う場合に必要となる。また、図示され
る加圧流体通路８は金型キャビティ１に接続されている
が、その接続位置は、最終的に金型キャビティ１へ加圧
流体を送り込める位置であれば、例えば樹脂通路７の途
中等であってもよい。[0011] the fixed mold 5, pressurized fluid passage 8 is a pressed passage of pressurized fluid into the mold cavity 1 is formed. The pressurized fluid passage 8, when performing the blow molding method using this injection mold is required from the point other than the resin passage 7 when performing press-fitting of the pressurized fluid. The illustrated pressurized fluid passage 8 is connected to the mold cavity 1. If the connection position is a position where the pressurized fluid can be finally sent to the mold cavity 1, for example, the resin passage 7 is connected. May be on the way.
【００１２】金型キャビティ１は、部分的に厚肉部を有
する成形型物を成形するためのもので、このような成形
型物の形状に対応する空間形状となっていて、厚肉部成
形部分２を有している。The mold cavity 1 is for molding a mold having a partially thick portion. The mold cavity 1 has a space shape corresponding to the shape of such a mold, and has a thick portion. It has a portion 2.
【００１３】成形体の部分的な厚肉部としては、例えば
補強用のリブ部、ボス、更には加圧流体を用いた中空成
形法において加圧流体を導くために設けられる加圧流体
誘導路等が挙げられる。Examples of the partially thick portion of the molded body include a rib portion for reinforcement, a boss, and a pressurized fluid guide path provided for guiding a pressurized fluid in a hollow molding method using a pressurized fluid. And the like.
【００１４】厚肉部成形部分２の金型キャビティ壁部の
内、金型開閉方向と直角な移動型６側の壁部は、厚肉部
成形部分２の内外方向に進退可能な可動金型キャビティ
壁部３となっている。この可動金型キャビティ壁部３の
移動ストロークは、厚肉部成形部分２の大きさ等にもよ
るが、通常は０．０５ｍｍ以上である。Among the mold cavity walls of the thick part forming part 2, the movable mold 6 side wall perpendicular to the mold opening / closing direction is a movable mold capable of moving in and out of the thick part forming part 2. The cavity wall 3 is provided. The moving stroke of the movable mold cavity wall 3 depends on the size of the thick portion molding portion 2 and the like, but is usually 0.05 mm or more.
【００１５】本発明で成形する成形型物の基本的な肉厚
は、特に制限はないが、一般的には０．５ｍｍ、好まし
くは２〜３．５ｍｍである。特に本発明は、成形型物の
厚肉部の幅が、その成形型物の基本的な肉厚の２／３以
上の場合に有効で、厚肉部成形部分２の金型キャビティ
壁部の内でも、このような厚肉部の幅方向に広がる面を
成形する金型キャビティ壁部を可動金型キャビティ壁部
３とすることが好ましい。The basic thickness of the molding die to be molded in the present invention is not particularly limited, but is generally 0.5 mm, preferably 2 to 3.5 mm. In particular, the present invention is effective when the width of the thick portion of the mold is 2/3 or more of the basic thickness of the mold, and the thickness of the mold cavity wall of the thick portion 2 is large. It is preferable that the mold cavity wall for molding the surface of the thick portion extending in the width direction be the movable mold cavity wall 3.
【００１６】また、この可動金型キャビティ壁部３は、
図３に示されるように厚肉部として突出する部分の全面
に対応するものとしたり、図示される位置と相対向する
固定型５側の位置に設けることもできる。The movable mold cavity wall 3 is
As shown in FIG. 3, it may correspond to the entire surface of the portion protruding as a thick portion, or may be provided at a position on the fixed mold 5 side opposite to the position shown.
【００１７】本射出成形用金型は、可動金型キャビティ
壁部３を内方向（厚肉部成形部分２の内方向）へ押圧す
るスプリングを押圧手段４として備えている。The injection molding die includes a spring for pressing the movable die cavity wall portion 3 inward (inward of the thick portion molding portion 2) as the pressing means 4.
【００１８】押圧手段４として設けられているスプリン
グは、金型キャビティ１内に溶融樹脂又は溶融樹脂と加
圧流体を充満させたときに、金型キャビティ１内の圧力
によって可動金型キャビティ壁部３を後退させる得る程
度の力で可動金型キャビティ壁部３を内方向へ押圧して
いるものである。When the mold cavity 1 is filled with the molten resin or the molten resin and the pressurized fluid, the spring provided as the pressing means 4 is moved by the pressure in the mold cavity 1 to form the movable mold cavity wall. The movable mold cavity wall portion 3 is pressed inward with a force enough to retract the movable mold cavity wall 3.
【００１９】押圧手段４は、上記のスプリングの他、流
体圧シリンダーや他の機械的手段でもよい。次に、本射
出成形用金型を用いた射出成形方法について説明する。The pressing means 4 may be a hydraulic cylinder or other mechanical means other than the above-mentioned spring. Next, an injection molding method using the present injection molding die will be described.
【００２０】本発明の射出成形方法は、本射出成形用金
型を用いた中空成形法で、金型キャビティ１内に溶融樹
脂の射出と加圧流体の圧入を行う。In the injection molding method of the present invention , a molten resin is injected into the mold cavity 1 and a pressurized fluid is injected into the mold cavity 1 by a hollow molding method using the present injection molding die.
【００２１】溶融樹脂の射出と加圧流体の圧入は、予定
射出量の内の一部の溶融樹脂の射出後、残りの溶融樹脂
の射出と共に加圧流体を圧入することで行っても、予定
量の溶融樹脂の射出完了後加圧流体を圧入することで行
ってもよい。また、金型キャビティ１内を溶融樹脂で満
たした後に加圧流体の供給を開始し、金型キャビティ１
内の樹脂の冷却による体積収縮に伴って加圧流体を圧入
するようにしてもよい。The injection of the molten resin and the press-in of the pressurized fluid may be performed by injecting the pressurized fluid together with the injection of the remaining molten resin after the injection of a part of the molten resin in the predetermined injection amount. The injection may be performed by injecting a pressurized fluid after the injection of the amount of the molten resin is completed. After the mold cavity 1 is filled with the molten resin, the supply of the pressurized fluid is started.
The pressurized fluid may be pressed in with volume shrinkage due to cooling of the resin inside.
【００２２】加圧流体の圧入は、図１に示されるような
加圧流体通路８から行っても、加圧流体ノズルを内蔵し
た射出ノズル（図示されていない）によって、樹脂通路
７から行ってもよい。The press-fitting of the pressurized fluid can be performed from the pressurized fluid passage 8 as shown in FIG. 1 or from the resin passage 7 by an injection nozzle (not shown) having a built-in pressurized fluid nozzle. Is also good.
【００２３】樹脂としては、一般の射出成形あるいは押
出成形等に使用される熱可塑性樹脂全般を用いることが
でき、必要に応じて、熱硬化性樹脂も使用できる。ま
た、樹脂には必要に応じて各種添加剤を添加することが
できる。As the resin, general thermoplastic resins used in general injection molding or extrusion molding can be used, and if necessary, thermosetting resins can also be used. Various additives can be added to the resin as needed.
【００２４】加圧流体としては、常温常圧でガス状又は
液状のもので、射出時の温度と圧力下において、使用樹
脂と反応又は混合されないものが使用される。具体的に
は例えば窒素ガス、炭酸ガス、空気、ヘリウムガス、
水、グリセリン、流動パラフィン等であるが、窒素ガ
ス、ヘリウムガス等の不活性ガスが好ましい。また、加
圧流体の圧力は、一般的には１０〜５００ｋｇ／ｃｍ2
程度である。As the pressurized fluid, a fluid which is gaseous or liquid at ordinary temperature and ordinary pressure and which does not react or mix with the resin used at the temperature and pressure at the time of injection is used. Specifically, for example, nitrogen gas, carbon dioxide gas, air, helium gas,
Water, glycerin, liquid paraffin and the like are preferable, and an inert gas such as nitrogen gas and helium gas is preferable. The pressure of the pressurized fluid is generally 10 to 500 kg / cm 2.
It is about.
【００２５】金型キャビティ１内が溶融樹脂又は溶融樹
脂と加圧流体で満たされた状態において、押圧手段４と
して図１に示されるようなスプリングを用いた場合、こ
のスプリングは金型キャビティ１内の圧力に押されて収
縮し、可動金型キャビティ壁部３はやや後退した位置で
スプリングによって内方向へ押圧された状態となる。ま
た、押圧手段４として流体圧シリンダー等を用いた場合
は、金型キャビティ１を溶融樹脂又は溶融樹脂と加圧流
体で満たした後に押圧手段４を作動させて可動金型キャ
ビティ壁部３を内方向へ押圧すればよい。When the inside of the mold cavity 1 is filled with the molten resin or the molten resin and the pressurized fluid, a spring as shown in FIG. The movable mold cavity wall portion 3 contracts by being pressed by the pressure, and is in a state of being pressed inward by a spring at a position where it is slightly retracted. When a fluid pressure cylinder or the like is used as the pressing means 4, the mold cavity 1 is filled with the molten resin or the molten resin and the pressurized fluid, and then the pressing means 4 is operated to move the movable mold cavity wall portion 3 inside. It may be pressed in the direction.
【００２６】本発明は、このように厚肉部成形部分２内
の樹脂を可動金型キャビティ壁部３で押圧しながら冷却
を進めるもので、冷却によって樹脂が体積収縮すると、
樹脂中に圧入されている加圧流体もしくは体積収縮に伴
って樹脂中に圧入される加圧流体の圧力では吸収し切れ
ない体積収縮量に対応する量だけ可動金型キャビティ壁
部３が前進し、これを吸収する。According to the present invention, the resin in the thick part molding portion 2 is cooled while being pressed by the movable mold cavity wall portion 3 as described above.
The movable mold cavity wall portion 3 advances by an amount corresponding to the amount of volume contraction that cannot be absorbed by the pressure of the pressurized fluid pressurized into the resin or the pressurized fluid pressurized into the resin due to the volume contraction. Absorb this.
【００２７】[0027]
【００２８】[0028]
【００２９】[0029]
【実施例】図１及び図２に示されるような構造の射出成
形用金型を用いて、幅２００ｍｍ、長さ、５００ｍｍ、
厚さ３ｍｍの平板に、幅５ｍｍ、長さ３００ｍｍ、高さ
２０ｍｍのリブを厚肉部として有する成形型物の射出成
形を行った。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Using an injection mold having a structure as shown in FIGS. 1 and 2, a width of 200 mm, a length of 500 mm,
Injection molding of a mold having a rib having a thickness of 5 mm, a length of 300 mm, and a height of 20 mm as a thick portion was performed on a flat plate having a thickness of 3 mm.
【００３０】樹脂としては、メルトインデックス１４、
密度０．９０のポリプロピレン（旭化成工業社製「旭化
成ポリプロＭ８６００」）を使用した。射出成形は、射
出圧１２００ｋｇ／ｃｍ2 、射出シリンダー温度２２０
℃、冷却時間４０ｓｅｃ、加圧流体（窒素ガス）圧力１
５０ｋｇ／ｃｍ2 、加圧流体圧入時間１０ｓｅｃ、圧入
加圧流体の圧力保持時間３０ｓｅｃで行った。As the resin, a melt index 14,
A polypropylene having a density of 0.90 ("Asahi Kasei Polypro M8600" manufactured by Asahi Kasei Kogyo Co., Ltd.) was used. Injection molding is performed at an injection pressure of 1200 kg / cm 2 and an injection cylinder temperature of 220.
° C, cooling time 40 sec, pressurized fluid (nitrogen gas) pressure 1
The test was performed at 50 kg / cm 2 , a pressurized fluid press-in time of 10 sec, and a pressure holding time of the press-in pressurized fluid of 30 sec.
【００３１】射出充填時間６ｓｅｃで溶融樹脂を充填し
た後、加圧流体を圧入して保持し、冷却後金型を開いて
成形型物を取り出した。After the molten resin was filled for an injection filling time of 6 seconds, a pressurized fluid was press-fitted and held, and after cooling, the mold was opened and the molded product was taken out.
【００３２】得られた成形型物を肉眼で観察したとこ
ろ、厚肉部（リブ部分）にも凹凸は認められず、良好な
表面状態のものであった。また、この成形型物の方面に
光沢のある塗装を施したところ、反射像にも歪みは見ら
れず、良好な塗装製品が得られた。When the obtained molded product was observed with the naked eye, no irregularities were observed in the thick portion (rib portion), and the molded product was in a good surface condition. In addition, when a glossy coating was applied to the surface of the molded article, no distortion was observed in the reflected image, and a good coated product was obtained.
【００３３】[0033]
【発明の効果】本発明は、以上説明した通りのものであ
り、部分的に厚肉部を設けた成形型物についてのヒケを
確実に防止することができ、このような成形型物につい
て高度の品質を付与できるものである。The present invention is as described above, and it is possible to surely prevent sinks in a mold having a partly thick portion. Quality can be imparted.
【図１】本発明で用いる射出成形用金型の一例を示す断
面図である。FIG. 1 is a cross-sectional view showing an example of an injection mold used in the present invention.
【図２】図１のＡ−Ａ断面図である。FIG. 2 is a sectional view taken along line AA of FIG.
【図３】可動金型キャビティ壁部の他の例を示す断面図
である。FIG. 3 is a cross-sectional view showing another example of a movable mold cavity wall portion.
１ 金型キャビティ ２ 厚肉部成形部分 ３ 可動金型キャビティ壁部 ４ 押圧手段 ５ 固定型 ６ 移動型 ７ 樹脂通路 ８ 加圧流体通路 DESCRIPTION OF SYMBOLS 1 Mold cavity 2 Thick molded part 3 Movable mold cavity wall 4 Pressing means 5 Fixed mold 6 Moving mold 7 Resin passage 8 Pressurized fluid passage
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平４−212822（ＪＰ，Ａ) 特開 平４−356243（ＪＰ，Ａ) 特開 昭59−127740（ＪＰ，Ａ) 特開 昭59−185636（ＪＰ，Ａ) 特開 昭63−209915（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) B29C 45/46 - 45/56 B29C 45/26 - 45/37 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-212822 (JP, A) JP-A-4-356243 (JP, A) JP-A-59-127740 (JP, A) JP-A-59-127 185636 (JP, A) JP-A-63-209915 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB name) B29C 45/46-45/56 B29C 45/26-45/37
Claims (1)
する金型キャビティを有し、厚肉部成形部分の金型キャ
ビティ壁部の少なくとも一部が、厚肉部形成部分の内外
方向へ進退が可能な可動金型キャビティ壁部となってお
り、この可動金型キャビティ壁部を内方向へ押圧する押
圧手段を有する射出成形用金型の金型キャビティ内への
溶融樹脂の射出と加圧流体の圧入を行う一方、可動金型
キャビティ壁部を内方向に押圧し、金型キャビティ内の
樹脂の冷却に伴う体積収縮と共に可動金型キャビティ壁
部を前進させながら、金型キャビティ内の溶融樹脂を冷
却固化させることを特徴とする射出成形方法。 1. A mold cavity for molding a mold having a partially thick portion, wherein at least a part of a mold cavity wall portion of the thick portion molding portion is formed inside and outside of the thick portion forming portion. It has a movable mold cavity wall which can advance and retreat in the direction of the injection mold to have a pressing means for pressing inward the movable mold cavity wall of the mold cavity
While performing injection of molten resin and press-in of pressurized fluid, movable mold
Pressing the cavity wall inward, the inside of the mold cavity
Movable mold cavity wall with volume shrinkage due to resin cooling
While moving the part forward, cool the molten resin in the mold cavity.
An injection molding method characterized by being solidified.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30382291A JP3253991B2 (en) | 1991-10-24 | 1991-10-24 | Injection molding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30382291A JP3253991B2 (en) | 1991-10-24 | 1991-10-24 | Injection molding method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05116194A JPH05116194A (en) | 1993-05-14 |
| JP3253991B2 true JP3253991B2 (en) | 2002-02-04 |
Family
ID=17925726
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30382291A Expired - Fee Related JP3253991B2 (en) | 1991-10-24 | 1991-10-24 | Injection molding method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3253991B2 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2661656B2 (en) * | 1991-11-22 | 1997-10-08 | 本田技研工業株式会社 | Injection molding method |
| JP2553868Y2 (en) * | 1991-11-22 | 1997-11-12 | 本田技研工業株式会社 | Injection mold for thin resin flat plate |
| EP0673746A1 (en) * | 1994-03-11 | 1995-09-27 | MASCHINENFABRIK HENNECKE GmbH | Method and apparatus for manufacturing moulded articles from multi-component plastic materials |
| GB9711048D0 (en) * | 1997-05-30 | 1997-07-23 | Kontor Moulding Systems Ltd | Injection moulding of thermoplastic polymer |
| JP4979627B2 (en) | 2008-03-31 | 2012-07-18 | 株式会社ホンダロック | Resin molding method and mold apparatus for resin molding |
| FR2933328B1 (en) * | 2008-07-01 | 2016-08-26 | Aplix Sa | MOLDING DEVICE FOR MANUFACTURING A MOLDED OBJECT COMPRISING A FIELD OF HOOKS |
| EP2484508A4 (en) * | 2009-09-29 | 2013-12-04 | Konica Minolta Opto Inc | Apparatus for manufacturing resin molded article for optical element, and method for manufacturing resin molded article for optical element |
| EP4238733A1 (en) * | 2022-03-04 | 2023-09-06 | JSP International SARL | Apparatus for manufacturing a component |
-
1991
- 1991-10-24 JP JP30382291A patent/JP3253991B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05116194A (en) | 1993-05-14 |
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