JP2011136515A - Injection molding method and injection molding metallic die - Google Patents

Injection molding method and injection molding metallic die Download PDF

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JP2011136515A
JP2011136515A JP2009299000A JP2009299000A JP2011136515A JP 2011136515 A JP2011136515 A JP 2011136515A JP 2009299000 A JP2009299000 A JP 2009299000A JP 2009299000 A JP2009299000 A JP 2009299000A JP 2011136515 A JP2011136515 A JP 2011136515A
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synthetic resin
mold
nesting
cavity
fixed
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JP2011136515A5 (en
JP5496649B2 (en
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Katsusuke Yokoyama
勝助 横山
Mitsuo Kaneko
光雄 金子
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Fuji Bellows Co Ltd
Fuji Seiko Co Ltd
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Fuji Bellows Co Ltd
Fuji Seiko Co Ltd
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Priority to JP2009299000A priority Critical patent/JP5496649B2/en
Priority to CN2010106232860A priority patent/CN102152442A/en
Priority to KR1020100135499A priority patent/KR101242991B1/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17Component parts, details or accessories; Auxiliary operations
    • B29C45/46Means for plasticising or homogenising the moulding material or forcing it into the mould
    • B29C45/56Means 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
    • B29C45/561Injection-compression moulding
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17Component parts, details or accessories; Auxiliary operations
    • B29C45/72Heating or cooling
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C2045/1486Details, accessories and auxiliary operations
    • B29C2045/14868Pretreatment of the insert, e.g. etching, cleaning

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide an injection molding metallic die by which a synthetic resin in a cavity can be compressed in a mold and a synthetic resin molding with good appearance quality can be produced without producing a burr, while suppressing the production cost of the metallic die as no metallic die with high production difficulty is not required and also improving durability of the metallic die. <P>SOLUTION: A heating medium is supplied into a heating medium passage 31 of an insert piece 6A of a fixed metallic die part 6 and a heating medium passage 34 of an insert piece 26A of a mobile metallic die part 26 to cause heating. When temperature rises to or above a softening point of the synthetic resin, molten synthetic resin is charged by pouring into a cavity S and pressure is held. Before or after pressure holding ends, the heating medium is supplied into a heating medium passage 32 of an insert piece attaching body 6B of the fixed metallic die part 6 and a heating medium passage 35 of an insert piece attaching body 26B of the mobile metallic die part 26 to cause heating and thermal expansion. After thermal expansion begins, a cooling medium is supplied into the heating medium passage 31 of the insert piece 6A and the heating medium passage 34 of the insert piece 26A to cause cooling. The synthetic resin is hardened while being compressed with pressure equal to or above injection pressure of the synthetic resin. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は、固定金型と可動金型とを閉じた状態で、キャビティ内に溶融した合成樹脂を射出充填し、且つこの合成樹脂を型内で圧縮するようにした射出成形方法及び射出成形金型に関する。   The present invention relates to an injection molding method and an injection mold in which a synthetic resin melted in a cavity is injected and filled in a state where a fixed mold and a movable mold are closed, and the synthetic resin is compressed in the mold. Regarding type.

合成樹脂の射出成形方法は、例えば特許文献1などに開示されているように、溶融した合成樹脂を射出する前に成形品の表面側を成形する表面側キャビティ形成面を加熱し、転写性の向上を図る技術が提案されている。   As disclosed in, for example, Patent Document 1, the synthetic resin injection molding method heats the surface-side cavity forming surface that molds the surface side of the molded product before injecting the molten synthetic resin, so Techniques for improvement have been proposed.

特開平6−254924号公報JP-A-6-254924

しかしながら、合成樹脂を射出成型金型内で圧縮するようにしたプレス機能付きの射出成形方法にあっては、固定金型と可動金型のキャビティを形成する合わせ面を充填された合成樹脂をプレスする分だけ余分に開けておいて、溶融した合成樹脂を注入後、両金型の合わせ面を閉め、型閉めをして合成樹脂をプレスしているため、合成樹脂成形品にバリが発生しやすくなり、バリを抑えるために圧縮量(プレス量)を多くすることができないという問題があった。   However, in the injection molding method with a press function in which the synthetic resin is compressed in the injection mold, the synthetic resin filled with the mating surfaces forming the cavities of the fixed mold and the movable mold is pressed. Since the molten plastic is poured, the mating surfaces of both molds are closed, the mold is closed, and the synthetic resin is pressed, resulting in burrs in the synthetic resin molded product. There was a problem that the amount of compression (press amount) could not be increased in order to be easy to suppress burrs.

このため、薄肉製品ならよいが、厚肉の圧縮量の多い製品にあっては、両金型の合わせ面を大きく開けておく必要があり、その状態でプレスを行うと、合わせ面に多量のバリが発生することとなる。   For this reason, thin-walled products can be used, but for thick-walled products with a large amount of compression, the mating surfaces of both molds need to be opened wide. Burrs will occur.

勿論、この問題を解決するためには、バリが発生しないような金型構造が必要であり、その場合には金型の製作難易度が上がり、コスト高になると共に金型の耐久性を低下させることがあった。また、合成樹脂の軟化点以下の温度でのプレスになるため、合成樹脂注入部とこの注入部から遠い部位とでは、樹脂温度に差ができて、プレスした際に合成樹脂の圧縮密度に差が生じて、合成樹脂成形品の外観品質の差がでてしまうという問題が発生する。   Of course, in order to solve this problem, it is necessary to have a mold structure that does not generate burrs. In this case, the difficulty of mold fabrication increases, resulting in higher costs and lower mold durability. There was something to do. In addition, since the press is performed at a temperature lower than the softening point of the synthetic resin, there is a difference in the resin temperature between the synthetic resin injection part and the part far from the injection part, and there is a difference in the compression density of the synthetic resin when pressed. This causes a problem that a difference in appearance quality of the synthetic resin molded product occurs.

そこで本発明は、上記の点に鑑み、キャビティ内の合成樹脂を型内で圧縮できるようにし、バリが生じないようして、外観品質が良好な合成樹脂成形品を製造でき、金型の製作難易度が高くなくとも足り、コストも抑えられと共に金型の耐久性の向上も図ることを目的とする。   Therefore, in view of the above points, the present invention makes it possible to produce a synthetic resin molded product with good appearance quality by allowing the synthetic resin in the cavity to be compressed in the mold and preventing burrs from being produced. The purpose is to reduce the cost, and to improve the durability of the mold, even if the degree of difficulty is not high.

このため第1の発明は、固定金型と可動金型とを閉じた状態で、キャビティ内に溶融した合成樹脂を射出充填して成形する射出成形方法において、
前記キャビティを形成する入れ子駒とこの入れ子駒の外側に設けられた熱膨張係数の高い金属で作られた入れ子取付体とを備えた前記固定金型又は可動金型の少なくとも一方の金型の入れ子駒を加熱し、
前記固定金型又は可動金型の少なくとも一方の金型の入れ子駒を加熱して合成樹脂の軟化点以上に昇温したら、溶融した合成樹脂を前記キャビティ内に注入充填して保圧し、
この保圧の終了に前後して、前記少なくとも一方の金型の前記入れ子取付体を加熱して熱膨張させると共に前記少なくとも一方の金型の入れ子駒を冷却して、前記合成樹脂の射出圧力以上の圧力でこの合成樹脂を圧縮させながら硬化させる
ことを特徴とする。
For this reason, the first invention is an injection molding method in which the fixed mold and the movable mold are closed, and the molten synthetic resin is injected and filled in the cavity.
A nesting piece of at least one of the fixed mold and the movable mold having a nesting piece forming the cavity and a nesting attachment body made of a metal having a high thermal expansion coefficient provided outside the nesting piece. Heat the
After heating the nesting piece of at least one of the fixed mold or the movable mold to raise the temperature above the softening point of the synthetic resin, the molten synthetic resin is injected and filled into the cavity to hold the pressure,
Before and after the end of the pressure holding, the nesting attachment body of the at least one mold is heated and thermally expanded and the nesting piece of the at least one mold is cooled to exceed the injection pressure of the synthetic resin. The synthetic resin is hardened while being compressed at a pressure of 5.

また第2の発明は、固定金型と可動金型とを閉じた状態で、キャビティ内に溶融した合成樹脂を射出充填して成形する射出成形装置において、
前記固定金型又は可動金型の少なくとも一方の金型を前記キャビティを形成する入れ子駒と、この入れ子駒の外側に断熱材を介して設けられた熱膨張係数の高い金属で作られた入れ子取付体とから構成し、
前記少なくとも一方の金型の入れ子駒及び入れ子取付体に加熱手段及び冷却手段を設け、
前記固定金型又は可動金型の少なくとも一方の金型の入れ子駒を前記加熱手段により加熱して合成樹脂の軟化点以上に昇温したら、溶融した合成樹脂を前記キャビティ内に注入充填して保圧し、この保圧の終了に前後して、前記少なくとも一方の金型の前記入れ子取付体を前記加熱手段により加熱して熱膨張させると共に前記少なくとも一方の金型の入れ子駒を前記冷却手段により冷却して、前記合成樹脂の射出圧力以上の圧力でこの合成樹脂を圧縮させながら硬化させることを特徴とする。
The second invention is an injection molding apparatus for injecting and molding molten synthetic resin into a cavity with the fixed mold and the movable mold closed.
A nesting piece for forming at least one of the fixed die and the movable die and the nesting piece for forming the cavity, and a nesting attachment body made of a metal having a high thermal expansion coefficient provided on the outside of the nesting piece via a heat insulating material. And consisting of
A heating means and a cooling means are provided in the nesting piece and the nesting attachment body of the at least one mold,
When the nesting piece of at least one of the fixed mold and the movable mold is heated by the heating means to raise the temperature above the softening point of the synthetic resin, the molten synthetic resin is injected and filled into the cavity. Before and after the pressure holding, the nesting attachment body of the at least one mold is heated by the heating means to be thermally expanded, and the nesting piece of the at least one mold is cooled by the cooling means. The synthetic resin is cured while being compressed at a pressure equal to or higher than the injection pressure of the synthetic resin.

本発明によれば、キャビティ内の合成樹脂を型内で圧縮できるようにし、バリが生じないようして、外観品質が良好な合成樹脂成形品を製造でき、金型の製作難易度が高くなくとも足り、コストも抑えられと共に金型の耐久性の向上も図ることができる。   According to the present invention, the synthetic resin in the cavity can be compressed in the mold, and no burr is produced, so that a synthetic resin molded product having a good appearance quality can be manufactured, and the difficulty in manufacturing the mold is not high. At the same time, the cost can be reduced and the durability of the mold can be improved.

射出成形金型の縦断正面図である。It is a vertical front view of an injection mold. 射出成形方法の第1段階を説明するための要部断面図である。It is principal part sectional drawing for demonstrating the 1st step of the injection molding method. 同じく第2段階を説明するための要部断面図である。It is a principal part sectional view for explaining the 2nd stage similarly. 同じく第3段階を説明するための要部断面図である。It is a principal part sectional view for explaining the 3rd step similarly. 同じく第4段階を説明するための要部断面図である。It is a principal part sectional view for explaining the 4th stage similarly.

以下図1乃至図5に基づき、本発明の実施の形態について説明する。先ず、図1に基づいて、本発明の第1の実施の形態の射出成形金型の全体構成について説明する。1は図示しない固定プラテンにボルトによって取り付けられた固定側組立体であり、この固定側組立体1は固定側第1ベースプレート2と、この固定側第1ベースプレート2にボルトによって固定された固定側第2ベースプレート3と、この固定側第2ベースプレート3にボルトによって固定された固定側第3ベースプレート4と、この固定側第3ベースプレート4の凹部内に配設されてこの固定側第3ベースプレート4にボルトにより固定される固定金型部6と、前記固定側第1ベースプレート2の前記固定プラテン寄りに設けられ固定側第1ベースプレート2を固定プラテンに対して位置決めするロケートリング7と、このロケートリング7に隣設して配設されたスプルーブッシュ8等から成る。   Hereinafter, an embodiment of the present invention will be described with reference to FIGS. First, based on FIG. 1, the whole structure of the injection mold of the 1st Embodiment of this invention is demonstrated. Reference numeral 1 denotes a fixed-side assembly attached to a fixed platen (not shown) with bolts. The fixed-side assembly 1 includes a fixed-side first base plate 2 and a fixed-side first base plate 2 fixed to the fixed-side first base plate 2 with bolts. 2 base plate 3, fixed side third base plate 4 fixed to the fixed side second base plate 3 by bolts, and bolts attached to the fixed side third base plate 4 by being disposed in the recesses of the fixed side third base plate 4. A fixed mold part 6 fixed by the above, a locate ring 7 provided near the fixed platen of the fixed first base plate 2 and positioning the fixed first base plate 2 with respect to the fixed platen; It consists of a sprue bush 8 or the like disposed adjacently.

そして、前記スプルーブッシュ8の中心には図示しない射出ノズルから射出される溶融した合成樹脂を通すための第1スプルー9が形成され、その下端部には第1ランナー10が形成され、このランナー10の出口たる第2スプルー11が形成され、更にこの第2スプルー11の下端部には第2ランナー12が形成され、この第2ランナー12の出口たるゲート(サイドゲート)13が形成される。このゲート13は前記固定金型部6のキャビティS端部においてこのキャビティS端部に開設された開口部に側方から連通する。   A first sprue 9 is formed at the center of the sprue bushing 8 for passing molten synthetic resin injected from an injection nozzle (not shown), and a first runner 10 is formed at the lower end thereof. A second sprue 11 as an outlet of the second runner 12 is formed, and a second runner 12 is formed at a lower end portion of the second sprue 11, and a gate (side gate) 13 as an outlet of the second runner 12 is formed. The gate 13 communicates from the side with an opening formed at the end of the cavity S at the end of the cavity S of the fixed mold portion 6.

一方、20は図示しない可動プラテンにボルトによって取り付けられた可動側組立体であり、この可動側組立体20は可動側第1ベースプレート21と、この可動側第1ベースプレート21にボルトによって固定された可動側第2ベースプレート22(エジェクタプレート)と、この可動側第2ベースプレート22を囲むように前記可動側第1ベースプレート21にボルトによって固定された可動側第3ベースプレート23と、この可動側第3ベースプレート23にボルトによって固定された可動側第4ベースプレート24と、この可動側第4ベースプレート24の凹部内に嵌合してこの第4プレート24に固定される可動金型部26等から成る。   On the other hand, 20 is a movable side assembly attached to a movable platen (not shown) with a bolt. The movable side assembly 20 is a movable side first base plate 21 and a movable side fixed to the movable side first base plate 21 with bolts. A side second base plate 22 (ejector plate), a movable side third base plate 23 fixed to the movable side first base plate 21 by bolts so as to surround the movable side second base plate 22, and the movable side third base plate 23 The movable-side fourth base plate 24 is fixed to the movable-side fourth base plate 24 by a bolt, and the movable mold part 26 is fitted into the concave portion of the movable-side fourth base plate 24 and fixed to the fourth plate 24.

そして、前記可動側第3ベースプレート23に立設されたガイド棒(図示せず)を、固定側第3ベースプレート4に設けられたガイド孔に挿入して、このガイド孔に前記ガイド棒が案内されて可動側組立体20が上下可能となる。   Then, a guide bar (not shown) erected on the movable side third base plate 23 is inserted into a guide hole provided in the fixed side third base plate 4, and the guide bar is guided into the guide hole. Thus, the movable side assembly 20 can be moved up and down.

この可動金型部26上面と前記固定金型部6下面とでキャビティSが形成され、このキャビティS内に溶融した合成樹脂が注入され、合成樹脂成形品が作製される。   A cavity S is formed by the upper surface of the movable mold part 26 and the lower surface of the fixed mold part 6, and a synthetic resin melted is injected into the cavity S to produce a synthetic resin molded product.

固定金型部6は入れ子駒6Aと入れ子駒6Aの外側(上側)に断熱材27を介して配置された入れ子駒取付体6Bとからなり、可動金型部26は入れ子駒26Aと入れ子駒26Aの外側(下側)に断熱材28を介して配置された入れ子駒取付体26Bとからなる。入れ子駒6A及び26Aは合成樹脂成形金型に適した特殊鋼(例えば、日立金属株式会社のCENA1)の鋼材で作られている。また、入れ子駒取付体6B及び26Bは熱膨張係数の高い、例えばアルミニウム合金で作られており、それぞれ断熱材27、28で被覆されている。即ち、入れ子駒取付体6Bは、断熱材27により前記固定側第3ベースプレート4との間、入れ子駒6Aとの間が断熱されている。また、入れ子駒取付体26Bは、断熱材28により前記可動側第4ベースプレート24との間、入れ子駒26Aとの間が断熱されている。   The fixed mold part 6 includes a nesting piece 6A and a nesting piece mounting body 6B disposed on the outer side (upper side) of the nesting piece 6A via a heat insulating material 27. The movable mold part 26 includes a nesting piece 26A and a nesting piece 26A. The insert piece attachment body 26 </ b> B is disposed on the outer side (lower side) via the heat insulating material 28. The nesting pieces 6A and 26A are made of a special steel suitable for a synthetic resin molding die (for example, CENA1 of Hitachi Metals, Ltd.). Further, the insert piece mounting bodies 6B and 26B are made of, for example, an aluminum alloy having a high thermal expansion coefficient, and are covered with heat insulating materials 27 and 28, respectively. That is, the nesting piece mounting body 6B is thermally insulated from the fixed side third base plate 4 and the nesting piece 6A by the heat insulating material 27. Further, the insert piece mounting body 26B is thermally insulated from the movable side fourth base plate 24 by the heat insulating material 28 and from the insert piece 26A.

前記固定側第3ベースプレート4及び可動側第4ベースプレート24には、温度調整手段が設けられ、常時所定温度に維持される。即ち、29は固定金型部6寄りの前記固定側第3ベースプレート4に形成された熱媒体通路で、30は可動金型部26寄りの可動側第4ベースプレート24に形成された熱媒体通路で、これらの熱媒体通路29、30にはキャビティS内に注入される合成樹脂に適した温度に応じて適宜な熱媒体が供給され、前記固定側第3ベースプレート4、固定金型部6、可動側第4ベースプレート24及び可動金型部26が常時所定温度に維持される。   The fixed third base plate 4 and the movable fourth base plate 24 are provided with temperature adjusting means, and are always maintained at a predetermined temperature. That is, 29 is a heat medium passage formed in the fixed third base plate 4 near the fixed mold portion 6, and 30 is a heat medium passage formed in the movable fourth base plate 24 near the movable mold portion 26. A suitable heat medium is supplied to these heat medium passages 29 and 30 according to the temperature suitable for the synthetic resin injected into the cavity S, and the fixed side third base plate 4, the fixed mold part 6, the movable The side fourth base plate 24 and the movable mold part 26 are always maintained at a predetermined temperature.

前記固定金型部6のキャビティSに近い入れ子駒6Aには、加熱手段及び冷却手段が設けられている。即ち、31は前記固定金型部6のキャビティSに近い入れ子駒6A内にこのキャビティSに沿って形成された熱媒体通路で、この熱媒体通路31内に各供給源から熱媒体入口31Aを介して流入した加熱用媒体である蒸気、各種油又は加熱水や、冷却用媒体である冷却水又は冷気を流して、固定金型部6のキャビティ形成面側を加熱又は冷却し、熱媒体入口31Aから熱媒体通路31に流入した加熱用媒体又は冷却用媒体は熱媒体出口31Bから流出する。   The nesting piece 6A close to the cavity S of the fixed mold part 6 is provided with heating means and cooling means. That is, 31 is a heat medium passage formed along the cavity S in the insert piece 6A close to the cavity S of the fixed mold portion 6, and the heat medium inlet 31A from each supply source is provided in the heat medium passage 31. The heating medium inlet flows through steam, various oils or heated water, or cooling water or cold air that is a cooling medium, to heat or cool the cavity forming surface side of the fixed mold part 6, The heating medium or cooling medium flowing from 31A into the heat medium passage 31 flows out from the heat medium outlet 31B.

また、32は前記固定金型部6の入れ子駒取付体内6B全体に形成された水平方向に延びた通路とこれに連通する垂直方向に延びた通路とから構成される熱媒体通路で、この熱媒体通路32内に熱媒体入口32Aから流入した加熱用媒体である蒸気、各種油又は加熱水や、冷却用媒体である冷気又は冷却水を流して入れ子駒取付体6B全体を加熱又は冷却し、熱媒体入口32Aから熱媒体通路32に流入した加熱用媒体又は冷却用媒体は熱媒体出口32Bから流出する。縦方向に延びた前記熱媒体通路32内には流路を形成する区画板33が設けられている。   Reference numeral 32 denotes a heat medium passage composed of a passage extending in the horizontal direction formed in the entire insert piece mounting body 6B of the fixed mold portion 6 and a passage extending in the vertical direction communicating with the passage. Steam or various oils or heating water that is a heating medium flowing into the medium passage 32 from the heat medium inlet 32A, or cold air or cooling water that is a cooling medium is flowed to heat or cool the entire nesting piece attachment body 6B. The heating medium or the cooling medium flowing into the heat medium passage 32 from the heat medium inlet 32A flows out from the heat medium outlet 32B. A partition plate 33 forming a flow path is provided in the heat medium passage 32 extending in the vertical direction.

また、34は前記可動金型部6のキャビティSに近い入れ子駒26A内にこのキャビティSに沿って形成された熱媒体通路で、この熱媒体通路34内に熱媒体入口34Aから流入した加熱用媒体である蒸気、各種油又は加熱水や、冷却用媒体である冷却水又は冷気を流して、可動金型部6のキャビティ形成面側を加熱又は冷却し、熱媒体入口34Aから熱媒体通路34に流入した加熱用媒体又は冷却用媒体は熱媒体出口34Bから流出する。   Reference numeral 34 denotes a heat medium passage formed along the cavity S in the insert piece 26A close to the cavity S of the movable mold portion 6. The heating medium passage 34 flows into the heat medium passage 34 from the heat medium inlet 34A. Steam, various oils or heated water as a medium, or cooling water or cold air as a cooling medium is flowed to heat or cool the cavity forming surface side of the movable mold part 6, and from the heat medium inlet 34 </ b> A to the heat medium passage 34. The heating medium or the cooling medium that has flowed into the air flows out from the heat medium outlet 34B.

また、35は前記可動金型部26の入れ子駒取付体内26B全体に形成された水平方向に延びた通路とこれに連通する垂直方向に延びた通路とから構成される熱媒体通路で、この熱媒体通路35内に熱媒体入口35Aから流入した加熱用媒体である蒸気、各種油又は加熱水や、冷却用媒体である冷気又は冷却水を流して入れ子駒取付体26B全体を加熱又は冷却し、熱媒体入口35Aから熱媒体通路35に流入した加熱用媒体又は冷却用媒体は熱媒体出口35Bから流出する。縦方向に延びた前記熱媒体通路35内には流路を形成する区画板36が設けられている。   Reference numeral 35 denotes a heat medium passage composed of a horizontally extending passage formed in the entire insert piece mounting body 26B of the movable mold portion 26 and a vertically extending passage communicating with the passage. Steam or various oils or heating water that is a heating medium flowing into the medium passage 35 from the heat medium inlet 35A, or cold air or cooling water that is a cooling medium is flowed to heat or cool the entire nesting piece mounting body 26B. The heating medium or cooling medium flowing into the heat medium passage 35 from the heat medium inlet 35A flows out from the heat medium outlet 35B. A partition plate 36 that forms a flow path is provided in the heat medium passage 35 extending in the vertical direction.

なお、前記入れ子駒6A、入れ子駒取付体内6B、入れ子駒26A及び入れ子駒取付体内26Bに設けられる加熱手段、冷却手段は、熱媒体通路、加熱用媒体、冷却用媒体に限られず、その他の手段でもよく、加熱手段は、例えば電気ヒータでもよい。   The heating means and the cooling means provided in the nesting piece 6A, the nesting piece mounting body 6B, the nesting piece 26A and the nesting piece mounting body 26B are not limited to the heat medium passage, the heating medium, and the cooling medium, but other means. Alternatively, the heating means may be an electric heater, for example.

次に、特に図2乃至図5に基づいて、成形動作について説明する。まず、上述した熱媒体通路29、30に熱媒体が供給されて、固定金型部6と可動金型部26とは、常時所定温度に維持されている。そして、固定金型部6と可動金型部26とを型閉めした状態では、図2に示すように、固定金型部6の入れ子駒6A下面と可動金型部26の入れ子駒26A上面との間に合成樹脂が充填されるキャビティSが形成されている。   Next, the molding operation will be described with particular reference to FIGS. First, the heat medium is supplied to the heat medium passages 29 and 30 described above, and the fixed mold part 6 and the movable mold part 26 are always maintained at a predetermined temperature. In a state where the fixed mold part 6 and the movable mold part 26 are closed, as shown in FIG. 2, the lower surface of the nesting piece 6A of the fixed mold part 6 and the upper surface of the nesting piece 26A of the movable mold part 26 A cavity S filled with synthetic resin is formed between the two.

この状態で、転写性の向上のために、入れ子駒6A及び26Aの熱媒体通路31及び34にそれぞれ加熱用媒体を流して入れ子駒6A及び26Aを加熱し、キャビティSに注入される合成樹脂の軟化点以上の温度に昇温させる。   In this state, in order to improve transferability, a heating medium is passed through the heat medium passages 31 and 34 of the nesting pieces 6A and 26A to heat the nesting pieces 6A and 26A, and the synthetic resin injected into the cavity S The temperature is raised to a temperature above the softening point.

その後、射出ノズルをスプルーブッシュ8に通して、溶融した合成樹脂を第1スプルー9、第1ランナー10、第2スプルー11、第2ランナー12及びゲート13を介して可動金型部26と固定金型部6との間のキャビティS内に射出注入し、キャビティS内に充填された合成樹脂の圧縮密度を高めるべく注入圧力を維持して保圧する。   Thereafter, the injection nozzle is passed through the sprue bush 8, and the molten synthetic resin is passed through the first sprue 9, the first runner 10, the second sprue 11, the second runner 12 and the gate 13, and the movable mold part 26 and the fixed mold. Injection and injection is performed in the cavity S between the mold part 6 and the injection pressure is maintained and maintained in order to increase the compression density of the synthetic resin filled in the cavity S.

また、図3に示すように、合成樹脂の保圧の終了に前後して(保圧の終了と同時に、或いは保圧の終了より僅か前に又は後でもよい。)、入れ子駒取付体6B及び26Bの熱媒体通路32及び35に加熱用媒体を流し、入れ子駒取付体6B及び26Bを急速に加熱して昇温させて、熱膨張させる。また、入れ子駒取付体6B及び26Bの熱膨張が開始したら、入れ子駒6A及び26Aの熱媒体通路31及び34内の加熱用媒体を排出した後に冷却用媒体を流して、入れ子駒6A及び26Aを冷却する。この場合、入れ子駒取付体6B及び26Bを熱膨張させて、合成樹脂の圧縮密度がある密度に高まったら、入れ子駒6A及び26Aの冷却を開始させるようにする。   Further, as shown in FIG. 3, before and after the end of the pressure holding of the synthetic resin (may be at the same time as the end of the pressure holding, or slightly before or after the end of the pressure holding), The heating medium is caused to flow through the heat medium passages 32 and 35 of 26B, and the insert frame attachment bodies 6B and 26B are rapidly heated to raise the temperature and thermally expand. Further, when the thermal expansion of the nesting piece attachment bodies 6B and 26B starts, the heating medium in the heat medium passages 31 and 34 of the nesting pieces 6A and 26A is discharged, and then the cooling medium is flowed to remove the nesting pieces 6A and 26A. Cooling. In this case, when the insert piece mounting bodies 6B and 26B are thermally expanded to increase the compression density of the synthetic resin to a certain density, cooling of the insert pieces 6A and 26A is started.

この結果、図4に示すように、固定金型部6では入れ子駒取付体6Bが熱膨張して入れ子駒6Aを押し下げ、可動金型部26では入れ子駒取付体26Bが熱膨張して入れ子駒26Aを押し上げ、キャビティSを狭めるとともに、キャビティSを形成する入れ子駒6A及び26Aが冷却されるため、キャビティSに充填された合成樹脂は射出圧力以上の圧力で圧縮(プレス)されながら硬化し、合成樹脂成形品Jとなる。   As a result, as shown in FIG. 4, in the fixed mold portion 6, the insert piece mounting body 6 </ b> B is thermally expanded to push down the insert piece 6 </ b> A, and in the movable mold portion 26, the insert piece mounting body 26 </ b> B is thermally expanded to insert the insert piece. 26A is pushed up, the cavity S is narrowed, and the insert pieces 6A and 26A forming the cavity S are cooled, so that the synthetic resin filled in the cavity S is cured while being compressed (pressed) at a pressure higher than the injection pressure, It becomes a synthetic resin molded product J.

このようにしてキャビティS内の合成樹脂が圧縮・硬化し、合成樹脂成形品Jが成形されたら、入れ子駒取付体6B及び26Bの熱媒体通路32及び35内の加熱用媒体を排出し、代わりに熱媒体通路32及び35内に冷却用媒体を流すことにより、入れ子駒取付体6B及び26Bが熱収縮させて、前記保圧を解除する。従って、図5に示すように、キャビティS内には合成樹脂成形品Jの上下に僅かな隙間G1及びG2が形成される。しかる後に、固定金型部6と可動金型部26とを型開きし、合成樹脂成形品Jを取り出す。   When the synthetic resin in the cavity S is compressed and cured in this way and the synthetic resin molded product J is formed, the heating medium in the heat medium passages 32 and 35 of the insert piece mounting bodies 6B and 26B is discharged, and instead When the cooling medium is caused to flow in the heat medium passages 32 and 35, the insert piece attachment bodies 6B and 26B are thermally contracted to release the holding pressure. Therefore, as shown in FIG. 5, in the cavity S, slight gaps G1 and G2 are formed above and below the synthetic resin molded product J. Thereafter, the fixed mold part 6 and the movable mold part 26 are opened, and the synthetic resin molded product J is taken out.

以上の本実施態様によれば、型閉めした状態で入れ子駒取付体6B及び26Bの熱膨張を利用して、キャビティS内の合成樹脂を無理なく適度に圧縮・硬化させることができ、型開きの際には合成樹脂成形品Jの表面と入れ子駒6A及び26Aとの間に隙間G1及びG2が形成され、型開きをスムーズに行うことができる。   According to the above-described embodiment, the synthetic resin in the cavity S can be reasonably compressed and cured without difficulty by using the thermal expansion of the insert piece mounting bodies 6B and 26B in a state where the mold is closed. In this case, gaps G1 and G2 are formed between the surface of the synthetic resin molded product J and the insert pieces 6A and 26A, so that the mold can be opened smoothly.

従って、合成樹脂を射出成型金型内でプレス圧縮して硬化させて、成形品を作製するために、従来はバリが発生しないような金型構造が必要であり、その場合には金型の製作難易度が上がり、コスト高になると共に金型の耐久性を低下させることがあり、また合成樹脂の軟化点以下の温度でのプレスになるため、合成樹脂注入部とこの注入部から遠い部位とでは樹脂温度に差ができて、プレスした際に合成樹脂の圧縮密度に差が生じて、合成樹脂成形品の外観品質の差がでてしまうという問題が発生したが、かかる問題点を解消することができる。   Therefore, in order to produce a molded product by press-compressing and curing a synthetic resin in an injection mold, a mold structure that does not generate burrs is conventionally required. The difficulty of manufacturing increases, the cost increases, and the durability of the mold may be reduced. Also, since the press is performed at a temperature below the softening point of the synthetic resin, the synthetic resin injection part and the part far from the injection part With this, there is a difference in the resin temperature, and there is a difference in the compression density of the synthetic resin when pressed, resulting in a difference in the appearance quality of the synthetic resin molded product, but this problem has been resolved can do.

即ち、合成樹脂成形品にバリ生じないようして、また全体として外観を損なわないようにでき、金型を安価に構成できると共に金型の耐久性を高めることができる。   That is, it is possible to prevent the occurrence of burrs in the synthetic resin molded product and to prevent the appearance from being impaired as a whole, and it is possible to configure the mold at a low cost and increase the durability of the mold.

なお、前述したように、本実施形態は、キャビティSに充填された合成樹脂を型内圧縮するために、また空間G1及びG2を作るために、両金型部6、26の入れ子駒取付体6B及び26Bを加熱すると共に入れ子駒6A及び26Aを冷却し、入れ子駒取付体6B及び26Bを熱膨張させて前記合成樹脂の射出圧力以上の圧力でこの合成樹脂を圧縮させながら硬化させるようにした。しかし、これに限らず、固定金型部6の入れ子駒取付体6B又は可動金型部26の入れ子駒取付体26Bの少なくともいずれか一方のみを加熱すると共に、入れ子駒6A又は26Aの少なくともいずれか一方のみを冷却するようにしてもよい。   Note that, as described above, in this embodiment, in order to compress the synthetic resin filled in the cavity S in the mold and to make the spaces G1 and G2, the insert piece attachment body of both mold parts 6 and 26 is used. 6B and 26B are heated and the insert pieces 6A and 26A are cooled, and the insert piece mounting bodies 6B and 26B are thermally expanded to be cured while compressing the synthetic resin at a pressure higher than the injection pressure of the synthetic resin. . However, the present invention is not limited to this, and at least one of the nesting piece attachment body 6B of the fixed mold portion 6 and the nesting piece attachment body 26B of the movable die portion 26 is heated, and at least one of the nesting pieces 6A and 26A. Only one side may be cooled.

以上のように、本発明の実施態様について説明したが、上述の説明に基づいて当業者にとって種々の代替例、修正又は変形が可能であり、本発明はその趣旨を逸脱しない範囲で前述の種々の代替例、修正又は変形を包含するものである。   As described above, the embodiments of the present invention have been described. However, various alternatives, modifications, and variations can be made by those skilled in the art based on the above description. Including alternatives, modifications or variations.

6 固定金型部
6A 入れ子駒
6B 入れ子駒取付体
26 可動金型部
26A 入れ子駒
26B 入れ子駒取付体
31 熱媒体通路
32 熱媒体通路
34 熱媒体通路
35 熱媒体通路
G1、G2 隙間
J 射出成形品
S キャビティ
6 Fixed mold part 6A Nesting piece 6B Nesting piece mounting body 26 Movable mold part 26A Nesting piece 26B Nesting piece mounting body 31 Heat medium passage 32 Heat medium passage 34 Heat medium passage 35 Heat medium passages G1, G2 Gap J Injection molded product S cavity

Claims (2)

固定金型と可動金型とを閉じた状態で、キャビティ内に溶融した合成樹脂を射出充填して成形する射出成形方法において、
前記キャビティを形成する入れ子駒とこの入れ子駒の外側に設けられた熱膨張係数の高い金属で作られた入れ子取付体とを備えた前記固定金型又は可動金型の少なくとも一方の金型の入れ子駒を加熱し、
前記固定金型又は可動金型の少なくとも一方の金型の入れ子駒を加熱して合成樹脂の軟化点以上に昇温したら、溶融した合成樹脂を前記キャビティ内に注入充填して保圧し、
この保圧の終了に前後して、前記少なくとも一方の金型の前記入れ子取付体を加熱して熱膨張させると共に前記少なくとも一方の金型の入れ子駒を冷却して、前記合成樹脂の射出圧力以上の圧力でこの合成樹脂を圧縮させながら硬化させる
ことを特徴とする射出成形方法。
In an injection molding method in which a fixed mold and a movable mold are closed, and a synthetic resin melted in a cavity is injected and filled,
A nesting piece of at least one of the fixed mold and the movable mold having a nesting piece forming the cavity and a nesting attachment body made of a metal having a high thermal expansion coefficient provided outside the nesting piece. Heat the
After heating the nesting piece of at least one of the fixed mold or the movable mold to raise the temperature above the softening point of the synthetic resin, the molten synthetic resin is injected and filled into the cavity to hold the pressure,
Before and after the end of the pressure holding, the nesting attachment body of the at least one mold is heated and thermally expanded and the nesting piece of the at least one mold is cooled to exceed the injection pressure of the synthetic resin. An injection molding method characterized in that the synthetic resin is cured while being compressed under the pressure of
固定金型と可動金型とを閉じた状態で、キャビティ内に溶融した合成樹脂を射出充填して成形する射出成形装置において、
前記固定金型又は可動金型の少なくとも一方の金型を前記キャビティを形成する入れ子駒と、この入れ子駒の外側に断熱材を介して設けられた熱膨張係数の高い金属で作られた入れ子取付体とから構成し、
前記少なくとも一方の金型の入れ子駒及び入れ子取付体に加熱手段及び冷却手段を設け、
前記固定金型又は可動金型の少なくとも一方の金型の入れ子駒を前記加熱手段により加熱して合成樹脂の軟化点以上に昇温したら、溶融した合成樹脂を前記キャビティ内に注入充填して保圧し、この保圧の終了に前後して、前記少なくとも一方の金型の前記入れ子取付体を前記加熱手段により加熱して熱膨張させると共に前記少なくとも一方の金型の入れ子駒を前記冷却手段により冷却して、前記合成樹脂の射出圧力以上の圧力でこの合成樹脂を圧縮させながら硬化させることを特徴とする射出成形装置。
In an injection molding apparatus that molds by injection-filling molten synthetic resin in a cavity with the fixed mold and the movable mold closed.
A nesting piece for forming at least one of the fixed die and the movable die and the nesting piece for forming the cavity, and a nesting attachment body made of a metal having a high thermal expansion coefficient provided on the outside of the nesting piece via a heat insulating material. And consisting of
A heating means and a cooling means are provided in the nesting piece and the nesting attachment body of the at least one mold,
When the nesting piece of at least one of the fixed mold and the movable mold is heated by the heating means to raise the temperature above the softening point of the synthetic resin, the molten synthetic resin is injected and filled into the cavity. Before and after the pressure holding, the nesting attachment body of the at least one mold is heated by the heating means to be thermally expanded, and the nesting piece of the at least one mold is cooled by the cooling means. Then, the synthetic resin is cured while being compressed at a pressure equal to or higher than the injection pressure of the synthetic resin.
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