JP2001047476A - Mold for injection molding for cylindrical article - Google Patents
Mold for injection molding for cylindrical articleInfo
- Publication number
- JP2001047476A JP2001047476A JP11229919A JP22991999A JP2001047476A JP 2001047476 A JP2001047476 A JP 2001047476A JP 11229919 A JP11229919 A JP 11229919A JP 22991999 A JP22991999 A JP 22991999A JP 2001047476 A JP2001047476 A JP 2001047476A
- Authority
- JP
- Japan
- Prior art keywords
- mold
- core
- molded product
- eccentric
- injection molding
- 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.)
- Pending
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
- B29C45/5605—Rotatable mould parts
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は筒状成形品の射出成
形用金型に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold for injection molding of a cylindrical molded product.
【０００２】[0002]
【従来の技術】従来、射出成形用金型内に射出された溶
融樹脂が金型内で冷却固化する際に、成形品各部の温度
及び密度分布が不均一になり、その結果、冷却後の成形
品収縮率が不均一になること、又、特に１点ゲートによ
って溶融樹脂をキャビティに射出成形する場合、保圧効
果が成形品全体に均一に行き渡らないことなどにより、
成形品の形状不良が生じていた。2. Description of the Related Art Conventionally, when a molten resin injected into an injection molding mold is cooled and solidified in the mold, the temperature and density distribution of each part of the molded article become non-uniform. Due to the non-uniform shrinkage of the molded product, and especially when the molten resin is injected into the cavity by a one-point gate, the holding pressure effect is not evenly spread over the entire molded product.
The molded product had defective shape.
【０００３】そこで、このような問題を解決するため
に、多点ゲートもしくはディスクゲートにより樹脂を注
入する金型や射出圧縮成形金型が知られている。In order to solve such a problem, a mold for injecting a resin through a multipoint gate or a disc gate or an injection compression molding mold is known.
【０００４】又、特開昭６３ー２７２２６号公報に開示
されているように、成形品内側から圧縮する方法とし
て、圧力流体構造を利用した金型や、特開平５ー１５４
８９６号公報に開示されているような射出ブロー金型が
提案されている。As disclosed in Japanese Patent Application Laid-Open No. 63-27226, as a method of compressing a molded product from the inside, a mold using a pressure fluid structure,
No. 896 has proposed an injection blow mold.
【０００５】即ち、前者の特開昭６３ー２７２２６号公
報記載の金型においては、作動液体の作用によって固定
型（キャビティ側面）をキャビティ内に膨出させ、樹脂
を径方向に圧縮し、軸方向に延伸させて管状又は筒状成
形品を成形するようになっている。That is, in the former mold described in Japanese Patent Application Laid-Open No. 63-27226, the fixed mold (side surface of the cavity) is expanded into the cavity by the action of the working liquid, and the resin is compressed in the radial direction. It is designed to be stretched in the direction to form a tubular or cylindrical molded article.
【０００６】一方、後者の特開平５ー１５４８９６号公
報記載の金型においては、射出成形用金型によって貫通
孔を持つパリソンを成形し、次いで別の中空型にこのパ
リソンを装着して加熱ブローによって管状又は筒状成形
品を成形するようになっている。On the other hand, in the latter mold described in Japanese Patent Application Laid-Open No. 5-154896, a parison having a through hole is formed by an injection mold, and then the parison is mounted on another hollow mold and heated. Is used to form a tubular or cylindrical molded product.
【０００７】[0007]
【発明が解決しようとする課題】しかしながら、このよ
うな金型を使用する場合、それぞれ以下のような問題が
ある。However, the use of such a mold has the following problems.
【０００８】〔多点ゲート及びディスクゲートを使用し
た金型の場合〕 （１）収縮率のバランスをとることは、ある程度金型設
計内できるが、収縮そのものを低減させることができな
い。 （２）成形された成形品のゲートカットに手間取る（特
にディスクゲート）。[Mold Using Multipoint Gate and Disk Gate] (1) Although it is possible to balance the shrinkage rate within the mold design to some extent, it is not possible to reduce the shrinkage itself. (2) It takes time to cut the gate of the molded product (particularly a disk gate).
【０００９】〔射出圧縮成形金型の場合〕 （１）円筒形状の成形品を成形しようとした場合、円周
全体を圧縮する機構が複雑となって困難であり、部分圧
縮構造にならざるを得ない。 （２）円筒端面を圧縮する場合は、型内離型（剥離）、
座屈の発生が懸念される。[In the case of an injection compression molding die] (1) When attempting to mold a cylindrical molded product, the mechanism for compressing the entire circumference is complicated and difficult, so that a partial compression structure is required. I can't get it. (2) When compressing the cylindrical end face, mold release (peeling),
Buckling may occur.
【００１０】〔特開昭６３ー２７２２６号公報記載の金
型の場合〕 （１）金型内で油等の作動液体を使用するため、成形時
の金型自体の変形により液体漏れが発生しやすい。 （２）金型内の作動液体回路が複雑になり、故障の原因
となり易い。 （３）充填樹脂に対し、コア部はすべり接触となり、接
触する部分に傷などが発生し、成形品に外観不良を生じ
易い。 （４）すべり接触のため充填樹脂との間で接触抵抗等に
よる発熱で、充填樹脂の温度分布が不均一になり易い。 （５）特に厚みの大きい筒状成形品を成形する場合、大
きな力が必要となり不向きである。[In the case of a mold described in JP-A-63-27226] (1) Since a working liquid such as oil is used in the mold, liquid leakage occurs due to deformation of the mold itself during molding. Cheap. (2) The working liquid circuit in the mold becomes complicated, which tends to cause a failure. (3) The core portion comes into sliding contact with the filled resin, and the contacting portion is scratched or the like, and the molded product is likely to have poor appearance. (4) The temperature distribution of the filling resin tends to be non-uniform due to heat generated by contact resistance or the like between the filling resin and the resin due to sliding contact. (5) Particularly when a cylindrical molded product having a large thickness is molded, a large force is required, which is not suitable.
【００１１】〔特開平５ー１５４８９６号公報記載の金
型の場合〕 （１）二段階成形となるため製造設備への投資が大と
く、又、製造スペースも大きくなる。 （２）二段階成形であるため、転写性に劣る。 （３）加熱ブローのため、成形品内面側の寸法精度が劣
る。 （４）パリソンを成形した後、ブロー成形するため、長
手方向の寸法が定まらず、ブロー成形後に再度長手方向
の寸法を決める装置が必要となる。 （５）特に厚みの大きい筒状成形品を成形する場合、大
きな力が必要となり不向きである。[In the case of a mold described in Japanese Patent Application Laid-Open No. 5-154896] (1) Since two-stage molding is used, investment in production equipment is large, and the production space is also large. (2) Since it is a two-stage molding, transferability is poor. (3) Due to the heat blow, the dimensional accuracy on the inner surface side of the molded product is inferior. (4) Since the parison is formed and then blow-molded, the dimension in the longitudinal direction is not determined, and a device for determining the dimension in the longitudinal direction again after blow molding is required. (5) Particularly when a cylindrical molded product having a large thickness is molded, a large force is required, which is not suitable.
【００１２】本発明は、従来の金型における叙上の問題
点に鑑みてなされたものであって、その目的とするとこ
ろは、従来の金型における問題点を解消し、均一な密度
を持ち、そりや変形、残留ひずみ等が少なく、収縮ムラ
のない高精度の寸法を備え、外観の優れた筒状成形品を
得ることができる筒状成形品の射出成形用金型を提供す
ることにある。The present invention has been made in view of the above-mentioned problems in the conventional mold, and has as its object to solve the problems in the conventional mold and have a uniform density. To provide an injection molding die for a cylindrical molded product which has high precision dimensions with little warpage, deformation, residual strain, etc., has no shrinkage unevenness, and has an excellent appearance. is there.
【００１３】[0013]
【課題を解決するための手段】このような目的を達成す
るために、請求項１記載の本発明に係る筒状成形品の射
出成形用金型は、固定型と、可動型のコア型との間に筒
状成形品に対応するキャビティが設けられた筒状成形品
の射出成形用金型であって、コア型は固定型内でコア型
の中心軸がキャビティ内で成形される成形品の中心軸に
対して平行状態を保ちながら偏心可能に設けられ、コア
型内に偏心コアが設けられ、偏心コアの一端部は回転体
の断面形状が長円の凹所内に挿入され、回転体の回転に
より偏心コアがコア型内を転動し、コア型と固定型との
間で、キャビティ内の筒形充填樹脂を圧縮できるように
なっていることを特徴とするものである。In order to achieve the above object, an injection molding die for a cylindrical molded product according to the present invention according to the present invention comprises a fixed die and a movable core die. A mold for injection molding of a cylindrical molded product in which a cavity corresponding to the cylindrical molded product is provided, wherein the core mold is a molded product in which the center axis of the core mold is molded in the cavity. The eccentric core is provided in the core mold while maintaining a parallel state with respect to the central axis of the eccentric core, and one end of the eccentric core is inserted into a recess having a cross section of the rotating body in an elliptical shape. The eccentric core rolls in the core mold due to the rotation of the core mold, and the cylindrical filling resin in the cavity can be compressed between the core mold and the fixed mold.
【００１４】又、請求項２記載の本発明に係る筒状成形
品の射出成形用金型は、請求項１記載の筒状成形品の射
出成形用金型において、偏心コアの一端部付近に偏心量
制御リングが設けられていることを特徴とするものであ
る。According to a second aspect of the present invention, there is provided the injection molding die for a cylindrical molded product according to the present invention, wherein the injection molding die for the cylindrical molded product according to the first aspect is provided near one end of the eccentric core. An eccentricity control ring is provided.
【００１５】又、請求項３記載の本発明に係る筒状成形
品の射出成形用金型は、請求項２記載の筒状成形品の射
出成形用金型において、偏心量制御リングの代わりに偏
心量制御リングが分割された偏心量制御分割リングが設
けられていることを特徴とするものである。According to a third aspect of the present invention, there is provided an injection molding die for a cylindrical molded product according to the present invention, wherein the injection molding die for a cylindrical molded product according to the second aspect is replaced with an eccentricity control ring. An eccentricity control ring is provided by dividing the eccentricity control ring.
【００１６】又、請求項４記載の本発明に係る筒状成形
品の射出成形用金型は、請求項２又は３記載の筒状成形
品の射出成形用金型において、偏心コアの一端部付近に
フランジが設けられ、フランジは内周部と外周部とから
なり、内周部と外周部との間に軸受けが設けられている
ことを特徴とするものである。According to a fourth aspect of the present invention, there is provided the injection molding die for a cylindrical molded product according to the present invention, wherein the one end of the eccentric core is provided in the injection molding die for a cylindrical molded product according to the second or third aspect. A flange is provided in the vicinity, the flange includes an inner peripheral portion and an outer peripheral portion, and a bearing is provided between the inner peripheral portion and the outer peripheral portion.
【００１７】本発明の射出成形用金型を使用して成形す
る筒状成形品の材質としては、高密度ボリエチレン等の
結晶化度が高く、収縮性の大きい樹脂が好適であるが、
塩化ビニル樹脂、ポリスチレン等の非結晶性樹脂も使用
可能である。As the material of the cylindrical molded article molded using the injection mold of the present invention, a resin having high crystallinity and high shrinkage such as high-density polyethylene is preferable.
Amorphous resins such as vinyl chloride resin and polystyrene can also be used.
【００１８】コア型の材質としては、特に限定されない
が、少なくともコア型の型面を形成する部分が、熱伝導
率が高いアルミニウム、アルミニウム合金、亜鉛合金、
銅合金等で形成されていることが好ましく、軽量化の観
点からこれらのうち、アルミニウムあるいはアルミニウ
ム合金がより好ましい。The material of the core mold is not particularly limited, but at least a part forming the mold surface of the core mold is made of aluminum, aluminum alloy, zinc alloy,
It is preferably formed of a copper alloy or the like, and among these, aluminum or an aluminum alloy is more preferable from the viewpoint of weight reduction.
【００１９】固定型の材質としては、特に限定されない
が、例えば、炭素鋼やステンレス鋼が挙げられる。又、
転写性をよくするために、充填樹脂に接する部分は鏡面
仕上げされていることが好ましい。The material of the fixed mold is not particularly limited, and examples thereof include carbon steel and stainless steel. or,
In order to improve the transferability, it is preferable that the portion in contact with the filling resin is mirror-finished.
【００２０】コア型の形状（径寸法）を適宜変える事に
より、使用する樹脂種類それぞれの収縮量に見合った圧
縮を行うようにしてもよい。By appropriately changing the shape (diameter) of the core mold, compression may be performed in accordance with the amount of shrinkage of each type of resin used.
【００２１】コア型の偏芯量は、筒状成形品のサイズ、
形状あるいは使用樹脂の種類によって成形条件及び収縮
量が異なり、特に限定されないが、例えば、高密度ポリ
エチレンを用いて呼び径５０の筒状成形品を成形する場
合、０．５〜６ｍｍ程度が好ましく、２ｍｍ前後がより
好ましい。The eccentricity of the core mold is determined by the size of the cylindrical molded product,
The molding conditions and the amount of shrinkage vary depending on the shape or the type of the resin used, and are not particularly limited. Around 2 mm is more preferable.
【００２２】コア型による圧縮時のコア型と充填樹脂と
の接触は、延伸及び圧延を助長させることから点接触と
することが好ましい。The contact between the core mold and the filling resin during the compression by the core mold is preferably point contact in order to promote stretching and rolling.
【００２３】又、本発明において、筒状成形品の筒状と
は、断面形状が真円状の筒形だけでなく、卵形や楕円状
をしているのものであっても構わないものであり、表面
に各種形状の凸部が突設されていてもよい。In the present invention, the cylindrical shape of the cylindrical molded article may be not only a cylindrical shape having a cross-sectional shape but also an oval shape or an elliptical shape. That is, various shapes of projections may be provided on the surface.
【００２４】〔作用〕請求項１記載の本発明に係る筒状
成形品の射出成形用金型においては、コア型は固定型内
でコア型の中心軸がキャビティ内で成形される成形品の
中心軸に対して平行状態を保ちながら偏心可能に設けら
れ、コア型内に偏心コアが設けられ、偏心コアの一端部
は回転体の断面形状が長円の凹所内に挿入され、回転体
の回転により偏心コアがコア型内を転動し、コア型と固
定型との間で、キャビティ内の筒形充填樹脂を圧縮でき
るようになっているので、本発明に係る筒状成形品の射
出成形用金型によっては、均一な密度を持ち、そりや変
形、残留ひずみ等が少なく、収縮ムラのない高精度の寸
法を備え、外観の優れた筒状成形品を得ることができ
る。According to the first aspect of the present invention, in the injection molding die for a cylindrical molded article according to the present invention, the core mold is formed in a fixed mold while the center axis of the core mold is molded in a cavity. The eccentric core is provided in the core mold while being kept eccentric while maintaining a parallel state with respect to the central axis, and one end of the eccentric core is inserted into a recess whose cross-sectional shape of the rotating body is an ellipse, and Since the eccentric core rolls in the core mold due to the rotation, and the cylindrical filling resin in the cavity can be compressed between the core mold and the fixed mold, the injection of the cylindrical molded product according to the present invention is performed. Depending on the molding die, it is possible to obtain a cylindrical molded product having a uniform density, a small amount of warpage, deformation, residual strain, and the like, high-precision dimensions with no uneven shrinkage, and excellent appearance.
【００２５】又、請求項２記載の本発明に係る筒状成形
品の射出成形用金型においては、偏心コアの一端部付近
に偏心量制御リングが設けられているので、偏心コアの
偏心量が制御でき、コア型の偏心量が制御できる。In the injection molding die for a cylindrical molded product according to the second aspect of the present invention, since the eccentric amount control ring is provided near one end of the eccentric core, the eccentric amount of the eccentric core can be improved. And the eccentricity of the core type can be controlled.
【００２６】又、請求項３記載の本発明に係る筒状成形
品の射出成形用金型においては、偏心量制御リングの代
わりに偏心量制御リングが分割された偏心量制御分割リ
ングが設けられているので、コア型の偏心量が制御で
き、更に偏心量制御分割リングの移動量によりコア型の
偏心量が調整できる。According to the third aspect of the present invention, in the injection molding die for a cylindrical molded product, an eccentric amount control ring in which the eccentric amount control ring is divided is provided instead of the eccentric amount control ring. Therefore, the amount of eccentricity of the core type can be controlled, and the amount of eccentricity of the core type can be adjusted by moving the eccentric amount control split ring.
【００２７】又、請求項４記載の本発明に係る筒状成形
品の射出成形用金型においては、偏心コアの一端部付近
にフランジが設けられ、フランジは内周部と外周部とか
らなり、内周部と外周部との間に軸受けが設けられてい
るので、偏心コアの一端部付近と偏心量制御リング又は
偏心量制御分割リングとの摩擦が避けられる。According to a fourth aspect of the present invention, there is provided an injection molding die for a cylindrical molded article, wherein a flange is provided near one end of the eccentric core, and the flange comprises an inner peripheral portion and an outer peripheral portion. Since the bearing is provided between the inner peripheral portion and the outer peripheral portion, friction between the vicinity of one end of the eccentric core and the eccentric amount control ring or the eccentric amount control split ring is avoided.
【００２８】[0028]
【発明の実施の形態】次に本発明の実施の形態を図によ
り説明する。図１は本発明の筒状成形品の射出成形用金
型の一例を示す断面図、図２は図１に示す本発明の筒状
成形品の射出成形用金型の要部を示す拡大断面図、図３
は図２のＩＩＩ−ＩＩＩ線における断面図である。図１
〜３において、Ａは本発明に係る筒状成形品の射出成形
用金型、１は射出成形用金型Ａの固定型、２は射出成形
用金型Ａの可動型である。固定型１と可動型２のコア型
２１との間に筒状成形品に対応するキャビティ３が設け
られている。Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view showing an example of an injection molding die for a cylindrical molded product according to the present invention. FIG. 2 is an enlarged cross-section showing a main part of the injection molding die for a cylindrical molded product according to the present invention shown in FIG. FIG. 3
FIG. 3 is a sectional view taken along line III-III in FIG. 2. FIG.
In 3 to 3, A is a mold for injection molding of the cylindrical molded product according to the present invention, 1 is a fixed mold of the mold A for injection molding, and 2 is a movable mold of the mold A for injection molding. The cavity 3 corresponding to the cylindrical molded product is provided between the fixed mold 1 and the core mold 21 of the movable mold 2.
【００２９】コア型２１内には偏心コア２２が設けら
れ、偏心コア２２の一端部側には回転体２３が設けら
れ、回転体２３は軸２４に回転可能に支持され、回転体
２３にはスプロケットホイール２３１が取付けられてい
る。An eccentric core 22 is provided in the core mold 21, and a rotating body 23 is provided on one end side of the eccentric core 22. The rotating body 23 is rotatably supported by a shaft 24, and the rotating body 23 has A sprocket wheel 231 is mounted.
【００３０】４は可動型２の受け板２５に取付けられた
モータであり、モータ４の駆動軸にはスプロケットホイ
ール４１が取付けられ、スプロケットホイール４１とス
プロケットホイール２３１との間にチェイン４２が掛け
られ、モータ４の作動により回転体２４が回転されるよ
うになっている。２５１は軸受けである。Reference numeral 4 denotes a motor mounted on the receiving plate 25 of the movable mold 2. A sprocket wheel 41 is mounted on a drive shaft of the motor 4, and a chain 42 is hung between the sprocket wheel 41 and the sprocket wheel 231. The rotating body 24 is rotated by the operation of the motor 4. 251 is a bearing.
【００３１】図２〜４に拡大して示すように、偏心コア
２２の断面形状が長円形の一端部２２１は回転体２３の
一端面に凹設された断面形状がやや大きい長径を備えた
長円形の凹部２３２内に嵌合されている。As shown in an enlarged manner in FIGS. 2 to 4, one end 221 having an oval cross section of the eccentric core 22 is a long section having a slightly larger cross section formed by recessing the one end surface of the rotating body 23. Fitted in a circular recess 232.
【００３２】２６は偏心量制御リングであり、偏心量制
御リング２６は偏心コア２２の一端部２２１の周辺部２
２２の周囲に設けられている。２２３は偏心コア２２の
一端部２２１と周辺部２２２との境界部に設けられた軸
受けである。Reference numeral 26 denotes an eccentric amount control ring. The eccentric amount control ring 26 is a peripheral portion 2 of one end 221 of the eccentric core 22.
22 are provided. Reference numeral 223 denotes a bearing provided at the boundary between one end 221 of the eccentric core 22 and the peripheral part 222.
【００３３】偏心量制御リング２６は偏心量制御棒２６
１の先端に設けられ、偏心量制御棒２６１の操作により
偏心量制御リング２６は矢印ａ及びｂで示すように往復
移動できるようになっている。２２４は偏心コア２２内
に設けられた加熱ヒータである。The eccentricity control ring 26 includes an eccentricity control rod 26
The eccentricity control ring 26 is provided at the tip of the eccentricity control rod 26 and can reciprocate as indicated by arrows a and b by operating the eccentricity control rod 261. 224 is a heater provided in the eccentric core 22.
【００３４】偏心量制御リング２６が矢印ｂ方向に移動
しているときは、回転体２３が回転すると偏心コア２２
が摩擦により回転し、遠心力により回転半径を大きくと
るように偏心回転し、コア型２１の内側から圧力を加
え、コア型２１がキャビティ３内で成形される成形品４
の中心軸に対して平行状態を保ちながら偏芯しながらキ
ャビティ３内を転動するようになっている。尚、２７は
金型ブロックであり、金型ブロック２７は高耐久材から
製作されている。When the eccentric amount control ring 26 is moving in the direction of the arrow b, the eccentric core 22
Are rotated by friction, eccentrically rotated by a centrifugal force so as to increase the radius of rotation, and apply pressure from the inside of the core mold 21 so that the core mold 21 is molded in the cavity 3.
And rolls in the cavity 3 while being eccentric while maintaining a parallel state with respect to the central axis. In addition, 27 is a mold block, and the mold block 27 is manufactured from a highly durable material.
【００３５】射出成形の初期段階では、図５、６に示す
ように、偏心量制御リング２６は最も矢印ａで示す方向
にあり、偏心コア２２及びコア型２１は中心軸上に位置
されている。In the initial stage of injection molding, as shown in FIGS. 5 and 6, the eccentricity control ring 26 is in the direction indicated by the arrow a most, and the eccentric core 22 and the core mold 21 are located on the central axis. .
【００３６】次いで、図７、８に示すように、回転体２
３が回転を開始すると、偏心コア２２が摩擦により回転
を開始する。それと同時に偏心制御リング２６が矢印ｂ
で示す方向に移動することにより偏心コア２２が遠心力
により最大径まで回転半径を大きく取るように偏心回転
する。Next, as shown in FIGS.
When 3 starts rotating, the eccentric core 22 starts rotating due to friction. At the same time, the eccentricity control ring 26 moves
As a result, the eccentric core 22 rotates eccentrically by the centrifugal force so as to have a large radius of rotation up to the maximum diameter.
【００３７】図９、１０に示すように、更に偏心制御リ
ング２６が矢印ｂで示す方向に最大移動することにより
偏心コア２２の回転半径が大きくなり、それに伴いコア
型２１が転動して樹脂４を内側から圧縮する量が拡大す
る。As shown in FIGS. 9 and 10, when the eccentricity control ring 26 further moves in the direction indicated by the arrow b, the radius of rotation of the eccentric core 22 increases. The amount of compression of 4 from inside increases.
【００３８】このようにして、キャビティ３内の樹脂４
がコア型２１の転動により内側から圧縮される。Thus, the resin 4 in the cavity 3
Is compressed from inside by the rolling of the core mold 21.
【００３９】図１〜１０に示す本発明の筒状成形品の射
出成形用金型Ａにおいては、叙上の構造を備えているの
で、キャビティ３に溶融樹脂４を充填し、溶融樹脂４が
固化する前にコア型２１を転動させると共に偏心させる
ことにより充填樹脂４を内部から圧縮しその形状を矯正
すると共に密度を高めることができ、高寸法精度及び外
観の優れた成形品が得られる。The mold A for injection molding a cylindrical molded product of the present invention shown in FIGS. 1 to 10 is provided with the above structure, so that the cavity 3 is filled with the molten resin 4, and the molten resin 4 By rolling and decentering the core mold 21 before solidification, the filling resin 4 can be compressed from the inside to correct the shape and increase the density, and a molded article having high dimensional accuracy and excellent appearance can be obtained. .
【００４０】図１１は本発明に係る筒状成形品の射出成
形用金型の他の一例を示す断面図、図１２は図１１に示
す射出成形用金型の要部を示す断面図、図１３は図１２
のＸＩＩＩ−ＸＩＩＩ線における断面図である。図１１
〜１３に示す射出成形用金型Ｂにおいては、図１〜１０
に示す金型Ａのように偏心量制御リング２６を使用する
代わりに、偏心量制御分割リング２６ｂを使用するもの
である。FIG. 11 is a sectional view showing another example of the injection mold for a cylindrical molded product according to the present invention, and FIG. 12 is a sectional view showing a main part of the injection mold shown in FIG. 13 is FIG.
FIG. 3 is a sectional view taken along line XIII-XIII of FIG. FIG.
In injection molding dies B shown in FIGS.
Instead of using the eccentricity control ring 26 as in the die A shown in FIG. 1, an eccentricity control split ring 26b is used.
【００４１】即ち、金型Ｂにおいては、図１１、１２に
示すように、可動型２の受け型２５に油圧シリンダ２６
２ｂが設けられ、油圧シリンダ２６２ｂの作動杆２６１
ｂの先端に４個の偏心量制御分割リング２６ｂ、２６ｂ
・・が設けられている。That is, in the mold B, as shown in FIGS.
2b is provided, and the operating rod 261 of the hydraulic cylinder 262b is provided.
b, four eccentricity control split rings 26b, 26b
・ ・ Is provided.
【００４２】４個の偏心量制御分割リング２６ｂ、２６
ｂ・・は油圧シリンダ２６２ｂの作動により矢印ｃで示
すように放射状に外側に連動して移動したり、中心に向
かって連動して移動するようになっている。Four eccentric amount control split rings 26b, 26
are moved radially outward and interlockingly toward the center as shown by arrow c by the operation of the hydraulic cylinder 262b.
【００４３】射出成形の初期段階では、図１４、１５に
示すように、偏心量制御リング２６ｂ、２６ｂ・・は最
も中心に接近した位置にあり、偏心コア２２及びコア型
２１は中心軸上に位置されている。In the initial stage of injection molding, as shown in FIGS. 14 and 15, the eccentricity control rings 26b are located closest to the center, and the eccentric core 22 and the core mold 21 are positioned on the central axis. Is located.
【００４４】次いで、図１６、１７に示すように、回転
体２３が回転を開始すると、偏心コア２２が摩擦により
回転を開始する。それと同時に偏心制御リング２６ｂ、
２６ｂ・・放射状に若干移動することにより偏心コア２
２が遠心力により最大径まで回転半径を大きく取るよう
に偏心回転する。Next, as shown in FIGS. 16 and 17, when the rotating body 23 starts rotating, the eccentric core 22 starts rotating due to friction. At the same time, the eccentric control ring 26b,
26b: The eccentric core 2 moves slightly radially
2 rotates eccentrically by centrifugal force so as to increase the radius of rotation to the maximum diameter.
【００４５】図１８、１９に示すように、更に偏心制御
リング２６ｂ、２６ｂ・・が放射状に最大移動すること
により偏心コア２２の回転半径が大きくなり、それに伴
いコア型２１が転動して樹脂４を内側から圧縮する量が
拡大する。As shown in FIGS. 18 and 19, the eccentricity control rings 26b, 26b,... Further move radially to the maximum, so that the radius of rotation of the eccentric core 22 increases. The amount of compression of 4 from inside increases.
【００４６】このようにして、キャビティ３内の樹脂４
がコア型２１の転動により内側から圧縮される。偏心制
御リング２６ｂ、２６ｂ・・の放射状方向の移動量によ
りコア型２１の偏心量を調整することができる。Thus, the resin 4 in the cavity 3
Is compressed from inside by the rolling of the core mold 21. The amount of eccentricity of the core mold 21 can be adjusted by the amount of radial movement of the eccentricity control rings 26b.
【００４７】図１１〜１９に示す本発明の筒状成形品の
射出成形用金型Ｂにおいては、叙上の構造を備えている
ので、キャビティ３に溶融樹脂４を充填し、溶融樹脂４
が固化する前にコア型２１を転動させると共に偏心させ
ることにより充填樹脂４を内部から圧縮しその形状を矯
正すると共に密度を高めることができ、高寸法精度及び
外観の優れた成形品が得られる。The mold B for injection molding of a cylindrical molded product of the present invention shown in FIGS. 11 to 19 has the above structure, so that the cavity 3 is filled with the molten resin 4 and the molten resin 4 is filled.
Rolling and eccentricity of the core mold 21 before solidification can compress the filling resin 4 from the inside, correct its shape and increase the density, and obtain a molded product with high dimensional accuracy and excellent appearance. Can be
【００４８】図８は本発明に係る射出成形用金型により
成形される筒状成形品の例を示す断面図である。即ち、
図８に示すように、図２０に示す筒状成形品４０におい
ては、両端開口部に拡径部４１が設けられ、内面中央に
凸条４２が設けられている。このような成形品４０を成
形するにはコア型の表面に拡径部４１に対応する凸部が
設けられ、凸条４２に対応する凹所が設けられているも
のである。FIG. 8 is a sectional view showing an example of a cylindrical molded product formed by the injection mold according to the present invention. That is,
As shown in FIG. 8, in the cylindrical molded article 40 shown in FIG. 20, an enlarged-diameter portion 41 is provided in the opening at both ends, and a ridge 42 is provided in the center of the inner surface. In order to mold such a molded product 40, a convex portion corresponding to the enlarged diameter portion 41 is provided on the surface of the core mold, and a concave portion corresponding to the convex ridge 42 is provided.
【００４９】以上、本発明の実施の形態を図により説明
したが、本発明の具体的な構成は図示の実施の形態に限
定されるものではなく、本発明の主旨を逸脱しない範囲
の設計変更は本発明に含まれる。例えば、本発明の射出
成形用金型は、図示の実施の形態のように横置き型とす
る代わりに縦置き型としても構わない。Although the embodiment of the present invention has been described with reference to the drawings, the specific configuration of the present invention is not limited to the illustrated embodiment, and the design change within a range not departing from the gist of the present invention. Are included in the present invention. For example, the injection mold of the present invention may be a vertical type instead of a horizontal type as in the illustrated embodiment.
【００５０】[0050]
【発明の効果】請求項１記載の本発明に係る筒状成形品
の射出成形用金型においては、均一な密度を持ち、そり
や変形、残留ひずみ等が少なく、収縮ムラのない高精度
の寸法を備え、外観の優れた筒状成形品を得ることがで
きる。According to the first aspect of the present invention, there is provided a mold for injection molding of a cylindrical molded article according to the present invention, which has a uniform density, a small amount of warpage, deformation, residual strain, etc., and a high precision without shrinkage unevenness. A cylindrical molded product having dimensions and excellent appearance can be obtained.
【００５１】又、請求項２記載の本発明に係る筒状成形
品の射出成形用金型においては、偏心コアの偏心量が制
御でき、コア型の偏心量が制御できる。Further, in the mold for injection molding of a cylindrical molded product according to the present invention, the eccentricity of the eccentric core can be controlled, and the eccentricity of the core mold can be controlled.
【００５２】又、請求項３記載の本発明に係る筒状成形
品の射出成形用金型においては、コア型の偏心量が制御
でき、更に偏心量制御分割リングの移動量によりコア型
の偏心量が調整できる。According to the third aspect of the present invention, the eccentricity of the core mold can be controlled, and the eccentricity of the core mold can be controlled by the moving amount of the eccentricity control split ring. The amount can be adjusted.
【００５３】又、請求項４記載の本発明に係る筒状成形
品の射出成形用金型においては、偏心コアの一端付近と
偏心量制御リング又は偏心量制御分割リングとの摩擦が
避けられるので、偏心コアが円滑に偏心回転し、偏心コ
アや偏心量制御リング又は偏心量制御分割リングが磨耗
することなく長期間に亘って使用できる。Further, in the injection molding die for a cylindrical molded product according to the present invention, friction between one end of the eccentric core and the eccentric amount control ring or the eccentric amount control split ring can be avoided. The eccentric core smoothly rotates eccentrically, and the eccentric core, the eccentric amount control ring, or the eccentric amount control split ring can be used for a long period of time without wear.
【図１】本発明に係る筒状成形品の射出成形用金型の一
例を示す断面図。FIG. 1 is a sectional view showing an example of a mold for injection molding of a cylindrical molded product according to the present invention.
【図２】図１に示す射出成形用金型の要部を拡大して示
す断面図。FIG. 2 is an enlarged sectional view showing a main part of the injection molding die shown in FIG.
【図３】図２のＩＩＩ−ＩＩＩ線における断面図。FIG. 3 is a sectional view taken along line III-III in FIG. 2;
【図４】偏心コアの一端部と回転体の凹部との関係を示
す斜視図。FIG. 4 is a perspective view showing a relationship between one end of an eccentric core and a recess of a rotating body.
【図５】初期状態における偏心コアと回転体との関係を
示す断面図。FIG. 5 is a sectional view showing a relationship between an eccentric core and a rotating body in an initial state.
【図６】図５のＶＩ−ＶＩ線における断面図。FIG. 6 is a sectional view taken along line VI-VI in FIG. 5;
【図７】偏心コアの偏心状態を示す断面図。FIG. 7 is a sectional view showing an eccentric state of the eccentric core.
【図８】図７のＶＩＩＩ−ＶＩＩＩ線における断面図。FIG. 8 is a sectional view taken along line VIII-VIII in FIG. 7;
【図９】偏心コアが最も偏心した状態を示す断面図。FIG. 9 is a sectional view showing a state where the eccentric core is most eccentric.
【図１０】図９のＸ−Ｘ線における断面図。FIG. 10 is a sectional view taken along line XX in FIG. 9;
【図１１】本発明に係る筒状成形品の射出成形用金型の
一例を示す断面図。FIG. 11 is a sectional view showing an example of a mold for injection molding of a cylindrical molded product according to the present invention.
【図１２】図１１に示す射出成形用金型の要部を拡大し
て示す断面図。FIG. 12 is an enlarged sectional view showing a main part of the injection mold shown in FIG. 11;
【図１３】図１２のＸＩＩＩ−ＸＩＩＩ線における断面
図。FIG. 13 is a sectional view taken along line XIII-XIII in FIG. 12;
【図１４】初期状態における偏心コアと回転体との関係
を示す断面図。FIG. 14 is a cross-sectional view showing a relationship between an eccentric core and a rotating body in an initial state.
【図１５】図１４のＸＶ−ＸＶ線における断面図。FIG. 15 is a sectional view taken along line XV-XV in FIG. 14;
【図１６】偏心コアの偏心状態を示す断面図。FIG. 16 is a sectional view showing an eccentric state of the eccentric core.
【図１７】図１６のＸＶＩＩ−ＸＶＩＩ線における断面
図。FIG. 17 is a sectional view taken along line XVII-XVII in FIG. 16;
【図１８】偏心コアが最も偏心した状態を示す断面図。FIG. 18 is a sectional view showing a state where the eccentric core is most eccentric.
【図１９】図１８のＸＩＸ─ＸＩＸ線における断面図。FIG. 19 is a sectional view taken along line XIXＩXIX in FIG. 18;
【図２０】筒状成形品の例を示す断面図。FIG. 20 is a sectional view showing an example of a cylindrical molded product.
Ａ、Ｂ 射出成形用金型 １ 固定型 ２ 可動型 ２１ コア型 ２２ 偏心コア ２２１ 一端部 ２３ 回転体 ２３１ スプロケットホイール ２３２ 凹部 ３ キャビティ ４ 樹脂 ４０ 成形品 A, B Injection mold 1 Fixed mold 2 Movable mold 21 Core mold 22 Eccentric core 221 One end 23 Rotating body 231 Sprocket wheel 232 Depression 3 Cavity 4 Resin 40 Molded product
フロントページの続き (72)発明者 新出 毅 京都市南区上鳥羽上調子町２−２ 積水化 学工業株式会社内 (72)発明者 東ケ崎 滋 大阪府枚方市野村中町62−１ 株式会社積 水工機製作所内 (72)発明者 松本 好史 大阪府枚方市野村中町62−１ 株式会社積 水工機製作所内 Ｆターム(参考） 4F202 AA05 AA13 AA15 AG08 CA11 CK06 CK18 CK67 CK73 CK90Continued on the front page (72) Inventor Takeshi Takeshi 2-2, Kamikaba Kamichocho-machi, Minami-ku, Kyoto Sekisui Kagaku Kogyo Co., Ltd. (72) Inventor Shigeru Togasaki 62-1 Nomura Nakamachi, Hirakata-shi, Osaka Shares (72) Yoshifumi Matsumoto, Inventor 62-1 Nomura Nakamachi, Hirakata City, Osaka Prefecture F-term (reference) 4F202 AA05 AA13 AA15 AG08 CA11 CK06 CK18 CK67 CK73 CK90
Claims (4)
成形品に対応するキャビティが設けられた筒状成形品の
射出成形用金型であって、コア型は固定型内でコア型の
中心軸がキャビティ内で成形される成形品の中心軸に対
して平行状態を保ちながら偏心可能に設けられ、コア型
内に偏心コアが設けられ、偏心コアの一端部は回転体の
断面形状が長円の凹所内に挿入され、回転体の回転によ
り偏心コアがコア型内を転動し、コア型と固定型との間
で、キャビティ内の筒形充填樹脂を圧縮できるようにな
っていることを特徴とする筒状成形品の射出成形用金
型。1. A mold for injection molding of a cylindrical molded product in which a cavity corresponding to the cylindrical molded product is provided between a fixed die and a movable core die. The center axis of the core mold is eccentrically provided while maintaining a parallel state with respect to the center axis of the molded product formed in the cavity. An eccentric core is provided in the core mold, and one end of the eccentric core is a rotating body. The eccentric core is rolled in the core mold by the rotation of the rotating body, so that the cylindrical filling resin in the cavity can be compressed between the core mold and the fixed mold. A mold for injection molding of a cylindrical molded product, characterized in that:
グが設けられていることを特徴とする請求項１記載の筒
状成形品の射出成形用金型。2. The mold for injection molding of a cylindrical molded product according to claim 1, wherein an eccentricity control ring is provided near one end of the eccentric core.
リングが分割された偏心量制御分割リングが設けられて
いることを特徴とする請求項２記載の筒状成形品の射出
成形用金型。3. The mold for injection molding of a cylindrical molded product according to claim 2, wherein an eccentricity control split ring obtained by dividing the eccentricity control ring is provided instead of the eccentricity control ring. .
られ、フランジは内周部と外周部とからなり、内周部と
外周部との間に軸受けが設けられていることを特徴とす
る請求項２又は３記載の筒状成形品の射出成形用金型。4. An eccentric core is provided with a flange near one end thereof, the flange includes an inner peripheral portion and an outer peripheral portion, and a bearing is provided between the inner peripheral portion and the outer peripheral portion. A mold for injection molding of a cylindrical molded product according to claim 2 or 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11229919A JP2001047476A (en) | 1999-08-16 | 1999-08-16 | Mold for injection molding for cylindrical article |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11229919A JP2001047476A (en) | 1999-08-16 | 1999-08-16 | Mold for injection molding for cylindrical article |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2001047476A true JP2001047476A (en) | 2001-02-20 |
Family
ID=16899804
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11229919A Pending JP2001047476A (en) | 1999-08-16 | 1999-08-16 | Mold for injection molding for cylindrical article |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2001047476A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3328604A4 (en) * | 2015-07-31 | 2019-07-24 | Husky Injection Molding Systems Luxembourg IP Development S.à.r.l | A preform, a mold stack for producing the preform, and a preform handling apparatus for handling the preform |
-
1999
- 1999-08-16 JP JP11229919A patent/JP2001047476A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3328604A4 (en) * | 2015-07-31 | 2019-07-24 | Husky Injection Molding Systems Luxembourg IP Development S.à.r.l | A preform, a mold stack for producing the preform, and a preform handling apparatus for handling the preform |
| US11186013B2 (en) | 2015-07-31 | 2021-11-30 | Husky Injection Molding Systems Ltd. | Preform, a mold stack for producing the preform, and a preform handling apparatus for handling the preform |
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