JPH05116194A - Injection mold and injection method used thereof - Google Patents
Injection mold and injection method used thereofInfo
- Publication number
- JPH05116194A JPH05116194A JP30382291A JP30382291A JPH05116194A JP H05116194 A JPH05116194 A JP H05116194A JP 30382291 A JP30382291 A JP 30382291A JP 30382291 A JP30382291 A JP 30382291A JP H05116194 A JPH05116194 A JP H05116194A
- Authority
- JP
- Japan
- Prior art keywords
- mold cavity
- resin
- injection molding
- cavity wall
- movable 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.)
- Granted
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)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、射出成形に用いる金型
及びこの金型を用いた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 a mold used for injection molding and an injection molding method using this mold. More specifically, the present invention relates to injection molding of a mold having a thick portion. Regarding prevention of sink marks, which often occur.
【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, that is, sink marks, which are caused by volume contraction caused by cooling of the resin in the mold cavity. Thus, the molten resin in the mold cavity is compressed and balanced with the volumetric shrinkage of the resin due to cooling (resin 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 to pressurize a pressurized fluid into a molten resin injected into a mold cavity and cool the resin in the mold cavity while applying an 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 wall portion partially, the volume shrinkage of the resin due to cooling is concentrated in the thick wall portion, so that the resin pressure holding method or the hollow molding method is used. However, depending on the type of resin and the intended design of the molding tool, sink marks may occur, although not extreme. In particular, it tends to occur when the width of the thick portion is set to 2/3 or more of the basic thickness of the molding die (thickness of a portion other than the thick portion). When a product has a mirror-finished surface or a glossy coating on the surface, sink marks appear as distortion of the image reflected on the surface of the thick portion, and there is a problem that high quality requirements of the product cannot be satisfied. Therefore, the design of the thick portion is limited for products that require high quality that does not cause such distortion of the reflected 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。The present invention has been made in view of the above-mentioned conventional problems, and it is possible to more reliably prevent the occurrence of sink marks in the injection molding of a mold having a 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、請求項１の発明で
は、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、厚肉部成形部分２の内外方向への進退が可能な可動
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を有してい
る射出成形用金型としているものである。Means and Actions for Solving the Problems To explain the means taken in the present invention for this purpose, in the invention of claim 1, as shown in FIG. 1 and FIG. A movable metal mold having a mold cavity 1 for molding the molded product, and at least a part of the mold cavity wall of the thick-walled molded portion 2 is capable of moving the thick-walled molded portion 2 in and out. The mold cavity wall 3 is provided, which is an injection molding mold having a pressing means 4 for pressing the movable mold cavity wall 3 inward.
【０００７】また、請求項２の発明では、上記請求項１
の射出成形用金型の金型キャビティ１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。According to the invention of claim 2, the above-mentioned claim 1
While the molten resin is injected and the pressurized fluid is pressed into the mold cavity 1 of the injection molding mold, the movable mold cavity wall portion 3 is pressed inward to remove the resin in the mold cavity 1. The molten resin in the mold cavity 1 is cooled and solidified while the movable mold cavity wall portion 3 is not advanced along with the volume contraction accompanying cooling.
【０００８】更に請求項３の発明では、上記請求項１の
射出成形用金型の金型キャビティ１に溶融樹脂を射出し
て満たす一方、可動金型キャビティ壁部３を内方向へ押
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。Further, in the third aspect of the present invention, while the molten resin is injected and filled into the mold cavity 1 of the injection molding die of the first aspect, the movable mold cavity wall portion 3 is pressed inward, The molten resin in the mold cavity 1 is cooled and solidified while the movable mold cavity wall portion 3 is advanced along with the volume contraction accompanying the cooling of the resin in the mold cavity 1.
【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, this injection molding die is similar to a normal injection molding die in that a fixed die 5 is used.
The fixed mold 5 is provided with a resin passage 7 (sprue, runner, gate, etc.) which is a molten resin injection path, and the 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内へ加圧
流体を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、必須のものではないが、本射出
成形用金型を用いて中空成形法を行う場合で、樹脂通路
７以外の箇所からの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。The fixed mold 5 is formed with a pressurized fluid passage 8 which is a passage for pressurizing the pressurized fluid into the mold cavity 1.
Although the pressurized fluid passage 8 is not essential, it is necessary when the blow molding method is performed using the injection molding die and the pressurized fluid is pressed from a position other than the resin passage 7. Becomes Further, the pressurized fluid passage 8 shown in the figure is connected to the mold cavity 1. However, if the connection position is a position where the pressurized fluid can be finally sent to the mold cavity 1,
For example, it may be in the middle of the resin passage 7.
【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 molding product having a thick portion in a part thereof, and has a space shape corresponding to the shape of such a molding product. It has a part 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。The partially thick portion of the molded body is, for example, a rib portion for reinforcement, a boss, and a pressurized fluid guide path provided for guiding the pressurized fluid in the hollow molding method using the pressurized fluid. Etc.
【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 wall portions of the thick portion molding portion 2, the wall portion on the side of the movable mold 6 which is perpendicular to the mold opening / closing direction is a movable mold which can be moved in and out of the thick portion molding portion 2. It is the cavity wall 3. The moving stroke of the movable mold cavity wall portion 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 mold to be molded in the present invention is not particularly limited, but is generally 0.5 mm, preferably 2 to 3.5 mm. The present invention is particularly effective when the width of the thick wall portion of the molding die is ⅔ or more of the basic wall thickness of the molding die, and the mold cavity wall portion of the thick portion molding portion 2 Even in the inside, it is preferable that the movable mold cavity wall 3 is a mold cavity wall that molds a surface of the thick portion that extends in the width direction.
【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。Further, the movable mold cavity wall portion 3 is
As shown in FIG. 3, it may correspond to the entire surface of the projecting portion as a thick portion, or may be provided at a position on the fixed mold 5 side opposite to the illustrated position.
【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。This injection molding die is provided with a spring as a pressing means 4 for pressing the movable mold cavity wall portion 3 inward (inward of the thick portion molding portion 2).
【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。The spring provided as the pressing means 4 is a wall of the movable mold cavity due to the pressure inside the mold cavity 1 when the mold cavity 1 is filled with molten resin or molten resin and a pressurized fluid. The movable mold cavity wall portion 3 is pressed inward with a force such that the movable mold cavity 3 can be retracted.
【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 fluid pressure cylinder or other mechanical means other than the above spring. Next, an injection molding method using the injection molding die will be described.
【００２０】請求項２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。The injection molding method according to the second aspect is a hollow molding method using the main mold for injection molding, in which the molten resin is injected and the pressurized fluid is injected into the mold cavity 1.
【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-fitting of the pressurized fluid may be carried out by injecting the pressurizing fluid together with the injection of the remaining molten resin after injecting a part of the molten resin out of the planned injection amount. It may be performed by pressurizing the pressurized fluid after the injection of the molten resin in an amount is completed. Further, after the mold cavity 1 is filled with the molten resin, the supply of the pressurized fluid is started, and the mold cavity 1
The pressurized fluid may be pressed in as the volume of the resin inside shrinks due to cooling.
【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。Pressurization of the pressurized fluid is carried out from the resin passage 7 by means of an injection nozzle (not shown) having a built-in pressurized fluid nozzle even though it is carried out from the pressurized fluid passage 8 as shown in FIG. 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, all thermoplastic resins used in general injection molding or extrusion molding can be used, and if necessary, a thermosetting resin can also be used. Further, 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 that is gaseous or liquid at room temperature and atmospheric pressure and that 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, etc., but an inert gas such as nitrogen gas or helium gas is preferable. The pressure of the pressurized fluid is generally 10 to 500 kg / cm 2
It is a degree.
【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 a spring as shown in FIG. 1 is used as the pressing means 4 in a state where the mold cavity 1 is filled with the molten resin or the molten resin and the pressurized fluid, this spring is inside the mold cavity 1. The movable mold cavity wall portion 3 is pressed by the pressure of 1 to be contracted, and the movable mold cavity wall portion 3 is in a state of being pressed inward by the spring at a slightly retracted position. 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. Press 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-walled portion molding portion 2 is cooled while being pushed 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 volumetric shrinkage that cannot be absorbed by the pressure of the pressurized fluid that is press-fitted into the resin or the volume of the pressurized fluid that is press-fitted into the resin. , Absorb this.
【００２７】請求項３の発明は、本射出成形用金型を用
いた樹脂保圧法で、金型キャビティ１内に過剰の溶融樹
脂を射出して圧縮した状態で冷却を進めると共に可動金
型キャビティ壁部３による押圧を行う以外、上記本射出
成形用金型を用いた中空成形法と同様である。According to a third aspect of the present invention, in a resin pressure-holding method using the present injection molding die, excess molten resin is injected into the die cavity 1 to advance cooling while being compressed and the movable die cavity. The method is the same as the blow molding method using the above-mentioned main mold for injection molding, except that the pressing by the wall portion 3 is performed.
【００２８】但し、この樹脂保圧法の場合、厚肉部が中
実で、その熱収縮量も大きくなるので、厚肉部内に中空
部を形成することで当該部分の熱収縮量を抑えることが
できる中空成形法を用いることが好ましい。However, in the case of this resin pressure-holding method, since the thick portion is solid and the heat shrinkage thereof is large, the heat shrinkage of the portion can be suppressed by forming the hollow portion in the thick portion. It is preferable to use a blow molding method that can be used.
【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。EXAMPLES Using an injection molding die having a structure as shown in FIGS. 1 and 2, a width of 200 mm, a length of 500 mm,
Injection molding was performed on a flat plate having a thickness of 3 mm and having a rib having a width of 5 mm, a length of 300 mm and a height of 20 mm as a thick portion.
【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, melt index 14,
A polypropylene having a density of 0.90 (“Asahi Kasei Polypro M8600” manufactured by Asahi Kasei Corporation) was used. For injection molding, injection pressure 1200 kg / cm 2 , injection cylinder temperature 220
℃, cooling time 40sec, pressurized fluid (nitrogen gas) pressure 1
It was carried out at 50 kg / cm 2 , pressurization fluid press-in time 10 sec, pressurization pressurization fluid pressure retention time 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 at an injection filling time of 6 sec, 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 mold was observed with the naked eye, no unevenness was observed in the thick portion (rib portion), and the surface condition was good. Further, when a glossy coating was applied to the surface of this molding, no distortion was observed in the reflection 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。EFFECTS OF THE INVENTION The present invention is as described above, and it is possible to surely prevent sink marks on a mold having a partially thick portion. The quality of can be added.
【図１】本発明に係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 molding die according to 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 the 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 1 Mold Cavity 2 Thick Wall Molding Part 3 Movable Mold Cavity Wall 4 Pressing Means 5 Fixed Mold 6 Movable Mold 7 Resin Passage 8 Pressurized Fluid Passage
Claims (3)
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、厚肉部成形部分の内外
方向への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
押圧手段を有していることを特徴とする射出成形用金
型。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 inside or outside the thick portion molding portion. A mold for injection molding, comprising a movable mold cavity wall part that can be moved back and forth in a direction, and having a pressing means for pressing the movable mold cavity wall part inward.
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。2. The mold for injection molding according to claim 1, wherein the molten resin is injected into the mold cavity and the pressurized fluid is pressed in, while the movable mold cavity wall is pressed inward. An injection molding method, characterized in that the molten resin in the mold cavity is cooled and solidified while the movable mold cavity wall portion is not advanced as the volume of the resin in the cavity shrinks as the resin cools.
ティに溶融樹脂を射出して満たす一方、可動金型キャビ
ティ壁部を内方向へ押圧し、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。3. A mold cavity of the injection molding die according to claim 1 is filled with a molten resin while the movable mold cavity wall is pressed inward to cool the resin in the mold cavity. An injection molding method, characterized in that the molten resin in the mold cavity is cooled and solidified while advancing the movable mold cavity wall portion with the accompanying volume contraction.
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 true JPH05116194A (en) | 1993-05-14 |
| JP3253991B2 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) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0558248U (en) * | 1991-11-22 | 1993-08-03 | 本田技研工業株式会社 | Injection mold |
| JPH05200801A (en) * | 1991-11-22 | 1993-08-10 | Honda Motor Co Ltd | Injection molding method |
| EP0673746A1 (en) * | 1994-03-11 | 1995-09-27 | MASCHINENFABRIK HENNECKE GmbH | Method and apparatus for manufacturing moulded articles from multi-component plastic materials |
| WO1998053975A1 (en) * | 1997-05-30 | 1998-12-03 | Kontor Moulding Systems Limited | Injection moulding of thermoplastic polymers |
| WO2009122866A1 (en) * | 2008-03-31 | 2009-10-08 | 株式会社ホンダロック | Resin molding method and die device for resin molding |
| WO2010004117A3 (en) * | 2008-07-01 | 2010-04-01 | Aplix | Injection-moulded article having a field of hooks obtained by moulding |
| EP2484508A1 (en) * | 2009-09-29 | 2012-08-08 | 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
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05200801A (en) * | 1991-11-22 | 1993-08-10 | Honda Motor Co Ltd | Injection molding method |
| JPH0558248U (en) * | 1991-11-22 | 1993-08-03 | 本田技研工業株式会社 | Injection mold |
| EP0673746A1 (en) * | 1994-03-11 | 1995-09-27 | MASCHINENFABRIK HENNECKE GmbH | Method and apparatus for manufacturing moulded articles from multi-component plastic materials |
| WO1998053975A1 (en) * | 1997-05-30 | 1998-12-03 | Kontor Moulding Systems Limited | Injection moulding of thermoplastic polymers |
| US7988904B2 (en) | 2008-03-31 | 2011-08-02 | Kabushiki Kaisha Honda Lock | Resin molding process and resin-molding mold device |
| WO2009122866A1 (en) * | 2008-03-31 | 2009-10-08 | 株式会社ホンダロック | Resin molding method and die device for resin molding |
| JP2009241480A (en) * | 2008-03-31 | 2009-10-22 | Honda Lock Mfg Co Ltd | Resin molding method and mold apparatus for molding resin |
| WO2010004117A3 (en) * | 2008-07-01 | 2010-04-01 | Aplix | Injection-moulded article having a field of hooks obtained by moulding |
| JP2011526550A (en) * | 2008-07-01 | 2011-10-13 | アプリックス | Molded product having hook surface obtained by injection molding |
| US9278469B2 (en) | 2008-07-01 | 2016-03-08 | Aplix | Injection-moulded article comprising a field of hooks obtained by moulding |
| EP2484508A1 (en) * | 2009-09-29 | 2012-08-08 | Konica Minolta Opto, Inc. | Apparatus for manufacturing resin molded article for optical element, and method for manufacturing resin molded article for optical element |
| JPWO2011040158A1 (en) * | 2009-09-29 | 2013-02-28 | コニカミノルタアドバンストレイヤー株式会社 | Optical element resin molded product manufacturing apparatus and optical element resin molded product manufacturing method |
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3253991B2 (en) | 2002-02-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6764292B2 (en) | Fluid compression of injection molded plastic materials | |
| JPH05116194A (en) | Injection mold and injection method used thereof | |
| JPH0957794A (en) | Injection compression molding method | |
| JPH02147431A (en) | Window having synthetic resin frame and manufacture thereof | |
| JPS59136213A (en) | Cooling method of resin molding die | |
| JPS588622A (en) | Molding of precise plastics parts | |
| JPH0549448B2 (en) | ||
| JPS6258293B2 (en) | ||
| JPH05301257A (en) | Injection molding method of molded article with rib and molded article thereby | |
| JP3083878B2 (en) | Molding method for partially thin resin molded products | |
| JPH04320819A (en) | Injection mold and manufacture for molded item | |
| JPH04320817A (en) | Injection mold and manufacture for molded article | |
| JP2002096352A (en) | In-mold coating method | |
| JP2712727B2 (en) | Cassette half molding method and cassette half molding die | |
| JPH0416319A (en) | Molding die assembly | |
| JPS5924492Y2 (en) | Synthetic resin injection mold | |
| JPH05168511A (en) | Hinged receptacle | |
| JPH02139215A (en) | Composite injection-molded body, method thereof and composite injection-molding equipment | |
| JP2865982B2 (en) | Local pressure type injection molding method and local pressure type injection molding machine | |
| JP2701530B2 (en) | Mold for molding the upper case for storing audio cassettes | |
| JPH079617Y2 (en) | Gas press-fitting mold | |
| JPH06143352A (en) | Sidegate block cutting type injection mold | |
| JPS646268Y2 (en) | ||
| JPH0579488B2 (en) | ||
| JPH08318550A (en) | Injection mold |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20011106 |
|
| LAPS | Cancellation because of no payment of annual fees |