JP2011121322A - Injection molding method - Google Patents

Injection molding method Download PDF

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JP2011121322A
JP2011121322A JP2009282301A JP2009282301A JP2011121322A JP 2011121322 A JP2011121322 A JP 2011121322A JP 2009282301 A JP2009282301 A JP 2009282301A JP 2009282301 A JP2009282301 A JP 2009282301A JP 2011121322 A JP2011121322 A JP 2011121322A
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mold
synthetic resin
movable mold
movable
fixed
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JP5565828B2 (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 JP2009282301A priority Critical patent/JP5565828B2/en
Priority to KR1020100125669A priority patent/KR101167468B1/en
Priority to CN2010105989587A priority patent/CN102166804A/en
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    • 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
    • B29C45/72—Heating or cooling
    • B29C45/73—Heating or cooling of the mould
    • 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
    • B29C45/64—Mould opening, closing or clamping devices

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  • 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

<P>PROBLEM TO BE SOLVED: To provide an injection molding method for facilitating mold opening of a stationary mold and a movable mold when performing the mold opening without damaging the surface of a vertical wall of an injection molded article, and easily performing in-mold coating of the molded article, even when the injection molded article has the vertical wall substantially parallel to the mold-opening direction. <P>SOLUTION: A gap 36 formed beforehand between a stationary mold part 6 and a movable mold part 26 by estimating thermal expansion of the movable mold part 26 is removed by heating and thermally expanding the movable mold part 26, in such a state that the gap 36 is removed, molten synthetic resin is injected and filled into a cavity S, thereafter, the movable mold part 26 is cooled and is thermally contracted, and the synthetic resin is also thermally contracted and a space G is formed between the outer surface of the synthetic resin molded article J and the stationary mold part 6. <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て成形する射出成形方法に関する。   The present invention relates to an injection molding method 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.

この種の射出成形方法は、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。
特開平６−２５４９２４号公報 In this type of injection molding method, as disclosed in, for example, Patent Document 1, a surface-side cavity forming surface that molds the surface side of a molded product is heated before injecting a molten synthetic resin, thereby transferring transferability. Techniques for improvement have been proposed.
JP-A-6-254924

しかしながら、合成樹脂成形品が型開き方向と略平行な垂直壁を有するものにあっては、固定金型によって前記垂直壁の意匠面（表面）を傷付け易くなり、特にこの垂直壁にシボ加工を施す場合にはシボ加工面が損傷し、また成形品に塗装を施す場合には垂直壁表面に型内塗装を施すことが困難となるという問題があった。   However, if the synthetic resin molded product has a vertical wall that is substantially parallel to the mold opening direction, the design surface (surface) of the vertical wall is likely to be damaged by the fixed mold, and particularly the vertical wall is subjected to a textured process. When applied, the textured surface is damaged, and when the molded product is coated, there is a problem that it is difficult to perform in-mold coating on the vertical wall surface.

そこで本発明は、上記の点に鑑み、射出成形品が型開き方向と略平行な垂直壁を有するものであっても、固定金型と可動金型とを型開きする際に、この型開きを容易にすると共に前記成形品の垂直壁表面を傷付けないようにし、更には成形品の型内塗装が容易に行えるようにすることを目的とする。   Therefore, in view of the above points, the present invention provides a mold opening when the fixed mold and the movable mold are opened even if the injection molded product has a vertical wall substantially parallel to the mold opening direction. Another object of the present invention is to make the molded product not easily damaged, and to facilitate in-mold coating of the molded product.

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、
前記可動金型の熱膨張を見込んで前記固定金型と可動金型との間に予め形成された隙間を前記可動金型を加熱することにより熱膨張させて前記隙間を無くし、
この隙間を無くした状態で溶融した合成樹脂をキャビティ内に注入充填し、
その後、前記可動金型を冷却して熱収縮させると共に合成樹脂も熱収縮させて、合成樹脂成形品の外表面と固定金型との間に空間を形成す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.
In anticipation of thermal expansion of the movable mold, the gap formed in advance between the fixed mold and the movable mold is thermally expanded by heating the movable mold to eliminate the gap.
Fill and fill the cavity with synthetic resin that has been melted with this gap removed,
Thereafter, the movable mold is cooled and thermally contracted, and the synthetic resin is also thermally contracted to form a space between the outer surface of the synthetic resin molded product and the fixed mold.

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方法において、
前記可動金型の熱膨張を見込んで前記固定金型と可動金型との間に予め形成された隙間を前記可動金型を加熱することにより熱膨張させて前記隙間を無くし、
この隙間を無くした状態で溶融した合成樹脂をキャビティ内に注入充填し、
その後、前記可動金型を冷却して熱収縮させると共に合成樹脂も熱収縮させて、合成樹脂成形品の外表面と固定金型との間に空間を形成し、
この空間内に塗料を注入する
ことを特徴とする。 According to a second aspect of the present invention, there is provided an injection molding method in which a molten synthetic resin is injected and filled in a cavity with a fixed mold and a movable mold closed.
In anticipation of thermal expansion of the movable mold, the gap formed in advance between the fixed mold and the movable mold is thermally expanded by heating the movable mold to eliminate the gap.
Fill and fill the cavity with synthetic resin that has been melted with this gap removed,
Thereafter, the movable mold is cooled and thermally contracted, and the synthetic resin is also thermally contracted to form a space between the outer surface of the synthetic resin molded product and the fixed mold,
It is characterized by injecting paint into this space.

本発明によれば、固定金型と可動金型とを型開きする際に、キャビティ内の射出成形品表面と固定金型との間に空間が形成されるので、型開きが容易になるばかりでなく、固定金型によって射出成形品の垂直壁の意匠面を傷付けることがなくなる。従って、射出成形品の垂直壁の意匠面に施されるシボ加工を綺麗に仕上げることができる。また、前記空間を利用して、射出成形品に型内塗装を容易に行うこともできる。   According to the present invention, when the fixed mold and the movable mold are opened, a space is formed between the surface of the injection molded product in the cavity and the fixed mold, so that the mold opening is facilitated. Instead, the fixed mold does not damage the design surface of the vertical wall of the injection molded product. Therefore, it is possible to finely finish the texture applied to the design surface of the vertical wall of the injection molded product. Further, in-mold coating can be easily performed on an injection molded product using the space.

射出成形装置の縦断正面図である。It is a vertical front view of an injection molding device. 射出成型方法の第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. 射出成形品にシボ加工を施す場合の第３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 3rd step in the case of giving a texturing to an injection molded product. 射出成形品にシボ加工を施す場合の第４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 4th step in the case of giving a texturing to an injection molded product.

以下図１乃至図７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装置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縦断面がコ字形状を呈する固定金型部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, embodiments of the present invention will be described with reference to FIGS. First, based on FIG. 1, the whole structure of the injection molding apparatus 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 portion 6 having a U-shaped longitudinal section fixed by the locating ring, and a locating ring that is provided near the fixed platen of the fixed first base plate 2 and positions the fixed first base plate 2 with respect to the fixed platen 7 and a sprue bushing 8 disposed adjacent to the locating ring 7.

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の下面に形成された凹部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、成形品が作製される。このキャビティＳは縦断面がコ字形状を呈しており、水平方向に延びる空間とこの空間に連通した垂直方向に延びる筒状の空間とから構成され、成形品は型開き方向と略平行な４つの垂直壁と一つの水平壁とから成り、一面が開口する箱形状を呈する。   A cavity S is formed by the upper surface of the movable mold portion 26 and the lower surface of the concave portion formed on the lower surface of the fixed mold portion 6, and a molten synthetic resin is injected into the cavity S to produce a molded product. The cavity S has a U-shaped longitudinal section, and is composed of a space extending in the horizontal direction and a cylindrical space extending in the vertical direction communicating with the space, and the molded product is substantially parallel to the mold opening direction. It consists of two vertical walls and one horizontal wall, and has a box shape with one side open.

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が所定温度に維持されるように、常時熱媒体が供給される。   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. According to the temperature suitable for the synthetic resin injected into the cavity S, the fixed side third base plate 4, the fixed mold part 6, the movable side fourth base plate 24, and the movable mold part A heat medium is constantly supplied so that 26 is maintained at a predetermined temperature.

３１は前記固定金型部６のキャビティＳに近い部位にこのキャビティＳに沿って形成された熱媒体通路で、この熱媒体通路３１内に加熱用媒体である熱い蒸気又は加熱水や、冷却用媒体である冷気や冷却水を流して、固定金型部６のキャビティ形成面側を加熱又は冷却する。   Reference numeral 31 denotes a heat medium passage formed along the cavity S in a portion close to the cavity S of the fixed mold portion 6, and hot steam or heated water which is a heating medium in the heat medium passage 31, or for cooling. Cold air or cooling water as a medium is flowed to heat or cool the cavity forming surface side of the fixed mold part 6.

また、３２は前記可動金型部２６内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３３から流入した加熱用媒体である蒸気又は加熱水や、冷却用媒体である冷気又は冷却水を流して可動金型部２６全体を加熱又は冷却する。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３４が設けられ、熱媒体入口３３から熱媒体通路３２に流入した熱媒体は熱媒体出口３５から流出する。   Reference numeral 32 denotes a heat medium passage formed of a horizontally extending passage formed in the entire movable mold portion 26 and a vertically extending passage communicating with the passage, and the heat medium passage 32 is formed in the heat medium passage 32. Steam or heated water that is a heating medium flowing in from the heat medium inlet 33 or cold air or cooling water that is a cooling medium is flowed to heat or cool the entire movable mold part 26. A partition plate 34 forming a flow path is provided in the heat medium passage 32 extending in the vertical direction, and the heat medium flowing into the heat medium passage 32 from the heat medium inlet 33 flows out from the heat medium outlet 35.

なお、２７は前記可動金型部２６と可動側第４ベースプレート２４との間に設けられた断熱体であり、前記可動金型部２６と可動側第４ベースプレート２４とを断熱する。   Reference numeral 27 denotes a heat insulator provided between the movable mold part 26 and the movable fourth base plate 24, and insulates the movable mold part 26 and the movable fourth base plate 24 from each other.

次に、特に図２乃至図５に基づいて説明すると、図２に示すように、固定金型部６及び可動金型部２６の熱膨張を許容する隙間３６が固定金型部６と可動金型部２６との間に予め形成され、可動金型部２６の熱膨張を許容する隙間３７が第４プレート２４と可動金型部２６との間にも同様に形成されている。即ち、可動金型部２６の熱膨張を見込んで、予め隙間３６、３７が形成される。この隙間３７は可動金型部２６の形状に応じてその垂直面の外周に形成するものであり、図示の位置に限定されるものではない。   Next, in particular, referring to FIGS. 2 to 5, as shown in FIG. 2, a gap 36 allowing thermal expansion of the fixed mold part 6 and the movable mold part 26 is formed between the fixed mold part 6 and the movable mold part. A gap 37 is formed between the fourth plate 24 and the movable mold part 26 in the same manner, and is formed in advance between the mold part 26 and allowing thermal expansion of the movable mold part 26. That is, the gaps 36 and 37 are formed in advance in consideration of the thermal expansion of the movable mold part 26. The gap 37 is formed on the outer periphery of the vertical surface according to the shape of the movable mold part 26, and is not limited to the position shown in the drawing.

まず、熱媒体通路２９、３０には常時熱媒体が供給されて、所定温度に維持されている固定金型部６と可動金型部２６とを型閉めした図２の状態において、熱媒体通路３１に合成樹脂の軟化点以上の温度の加熱用媒体を流すと共に熱媒体通路３２に合成樹脂の軟化点以上の温度の加熱用媒体を流して、両金型部６、２６を昇温すると、例えば時効硬化鋼の鋼材（例えば、膨張係数０．００００１２５）で作られた固定金型部６と例えば膨張係数が大きいアルミニウム合金（例えば、膨張係数０．００００２３６）で作られた可動金型部２６とが熱膨張するため、断熱体２７を境として上方の１８０度の範囲内（上方向及び横方向）で膨出するので、その膨張係数の差によって採用した隙間３６、３７がなくなる。この場合、両金型部６、２６を昇温することにより、合成樹脂の転写性の向上が図れて、射出成形品Ｊの意匠面を綺麗に仕上げることができる。   First, in the state of FIG. 2 in which the fixed mold part 6 and the movable mold part 26, which are constantly supplied with the heat medium in the heat medium paths 29 and 30 and are maintained at a predetermined temperature, are closed. When a heating medium having a temperature equal to or higher than the softening point of the synthetic resin is allowed to flow through 31 and a heating medium having a temperature equal to or higher than the softening point of the synthetic resin is caused to flow through the heat medium passage 32, both mold parts 6 and 26 are heated. For example, a stationary mold portion 6 made of age hardened steel (for example, an expansion coefficient of 0.0000125) and a movable mold portion 26 made of an aluminum alloy having a large expansion coefficient (for example, an expansion coefficient of 0.0000236). , And expands within an upper 180 ° range (upward and lateral directions) with the heat insulator 27 as a boundary, and the gaps 36 and 37 employed are eliminated due to the difference in expansion coefficient. In this case, by raising the temperature of both mold parts 6 and 26, the transferability of the synthetic resin can be improved, and the design surface of the injection molded product J can be finished finely.

即ち、キャビティＳ底面を可動金型部２６の段差部２６Ａの上面で形成しており、段差部２６Ａの外側面と固定金型部６のキャビティ形成面の下端部と当接すると共にこの段差部２６Ａ下端部に連通する外上面２６Ｂと固定金型部６の下面とが当接し、且つ可動金型部２６の周側面と可動側第４ベースプレート２４とが当接して、固定金型部６と可動金型部２６の間には、図３に示すようにキャビティＳのみが残ることになる。   That is, the bottom surface of the cavity S is formed on the upper surface of the stepped portion 26A of the movable mold portion 26, abuts against the outer surface of the stepped portion 26A and the lower end portion of the cavity forming surface of the fixed mold portion 6 and this stepped portion 26A. The outer upper surface 26B communicating with the lower end part contacts the lower surface of the fixed mold part 6, and the peripheral side surface of the movable mold part 26 contacts the movable side fourth base plate 24, so that the fixed mold part 6 and the movable mold part 6 are movable. Only the cavity S remains between the mold parts 26 as shown in FIG.

なお、型閉めする前に、熱媒体通路３１、３２に加熱用媒体を流し始めて、その後に型閉めを開始してもよい。   Note that the heating medium may start to flow through the heat medium passages 31 and 32 before the mold closing, and then the mold closing may be started.

図３の状態で、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内に射出注入して、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。   In the state of FIG. 3, the injection nozzle is passed through the sprue bush 8, and the molten synthetic resin is moved through the first sprue 9, the first runner 10, the second sprue 11, the second runner 12 and the gate 13. Injecting and injecting into the cavity S between 26 and the fixed mold part 6, the injection pressure is maintained and the pressure is maintained in order to increase the compression density of the synthetic resin.

この保圧した後に、前記合成樹脂の収縮が始まり、硬化し始める。その後、熱媒体通路３１及び３２内の加熱用媒体を排出させ、熱媒体通路３１及び３２にそれぞれ合成樹脂の軟化点未満の温度の冷却用媒体を供給し、固定金型部６及び可動金型部２６を急冷する。すると、可動金型部２６が熱収縮する方向と同方向に合成樹脂も収縮しながら硬化して、合成樹脂の射出成形品Ｊとなる。この場合、急冷による合成樹脂の収縮に要する時間は、通常の樹脂成形時の合成樹脂の収縮に要する時間より短い。   After this pressure holding, the synthetic resin begins to shrink and harden. Thereafter, the heating medium in the heat medium passages 31 and 32 is discharged, and a cooling medium having a temperature lower than the softening point of the synthetic resin is supplied to the heat medium passages 31 and 32, respectively. The part 26 is rapidly cooled. Then, the synthetic resin is cured while shrinking in the same direction as the direction in which the movable mold part 26 is thermally contracted, and an injection molded product J of the synthetic resin is obtained. In this case, the time required for shrinkage of the synthetic resin by rapid cooling is shorter than the time required for shrinkage of the synthetic resin during normal resin molding.

即ち、射出成形品Ｊに抱え込まれた状態で可動金型部２６が熱収縮し、固定金型部６のキャビティＳ形成面に押圧していた合成樹脂が固定金型部６表面より剥離され、図５に示すように、固定金型部６（固定金型部６のキャビティＳ形成表面）と射出成形品Ｊ表面との間に空間（隙間）Ｇが発生し、キャビティＳ以外の固定金型部６と可動金型部２６との間、第４プレート２４と可動金型部２６との間に隙間３６、３７が形成されるようになる。   That is, the movable mold part 26 is thermally contracted while being held in the injection molded product J, and the synthetic resin pressed against the cavity S forming surface of the fixed mold part 6 is peeled off from the surface of the fixed mold part 6. As shown in FIG. 5, a space (gap) G is generated between the fixed mold part 6 (the surface of the fixed mold part 6 where the cavity S is formed) and the surface of the injection-molded product J. Clearances 36 and 37 are formed between the portion 6 and the movable mold portion 26 and between the fourth plate 24 and the movable mold portion 26.

このため、射出成形品ＪをキャビティＳから取り出すために、固定金型部６と可動金型部２６とを型開きする際に、射出成形品Ｊ表面と固定金型部６とが密着しておらず、射出成形品Ｊ表面と固定金型部６との間、特に射出成形品Ｊの垂直壁が固定金型部６の垂直面との間が離れているので、型開きをスムーズに行えるばかりでなく、射出成形品Ｊの垂直壁が固定金型部６の垂直面に接触しないようにして射出成形品Ｊの垂直壁表面（意匠面）の傷付きを防止できる。   For this reason, when the fixed mold part 6 and the movable mold part 26 are opened to take out the injection molded product J from the cavity S, the surface of the injection molded product J and the fixed mold part 6 are in close contact with each other. In addition, since the surface of the injection molded product J and the fixed mold part 6 are separated from each other, in particular, the vertical wall of the injection molded product J is separated from the vertical surface of the fixed mold part 6, the mold can be opened smoothly. In addition, the vertical wall surface (design surface) of the injection molded product J can be prevented from being damaged by preventing the vertical wall of the injection molded product J from coming into contact with the vertical surface of the fixed mold portion 6.

また、図６及び図７に示すように、固定金型部６にシボ加工溝６Ａを形成して、射出成形品Ｊの垂直壁の側面にシボ加工を施す場合でも、キャビティＳ内に合成樹脂を充填し（図６参照）、熱媒体通路３１及び３２内の加熱用媒体を排出させ、熱媒体通路３１及び３２に冷却用媒体を供給して固定金型部６及び可動金型部２６を急冷し、その後の型開きの際には、射出成形品Ｊ表面と固定金型部６との間、特に射出成形品Ｊのシボ加工面３８と固定金型部６の垂直面との間に空間Ｇ（隙間）が形成されているため、射出成形品Ｊのシボ加工面３８を損傷させることなく、型開きを行うことができる。従って、射出成形品Ｊの垂直壁の意匠面に施されるシボ加工を綺麗に仕上げることができる。   Further, as shown in FIGS. 6 and 7, even when a textured groove 6 </ b> A is formed in the fixed mold portion 6 and the side surface of the vertical wall of the injection molded product J is textured, a synthetic resin is formed in the cavity S. (See FIG. 6), the heating medium in the heat medium passages 31 and 32 is discharged, the cooling medium is supplied to the heat medium passages 31 and 32, and the fixed mold portion 6 and the movable mold portion 26 are moved. Upon rapid cooling and subsequent mold opening, between the surface of the injection molded product J and the fixed mold part 6, particularly between the embossed surface 38 of the injection molded product J and the vertical surface of the fixed mold part 6. Since the space G (gap) is formed, the mold opening can be performed without damaging the embossed surface 38 of the injection molded product J. Accordingly, it is possible to finely finish the texture applied to the design surface of the vertical wall of the injection molded product J.

なお、前述したように、隙間３６、３７を無くすために、また空間Ｇを作るために、両金型部６、２６を加熱又は冷却するようにしたが、これに限らず、可動金型部２６のみを加熱又は冷却するようにしてもよい。   As described above, both the mold parts 6 and 26 are heated or cooled in order to eliminate the gaps 36 and 37 and to make the space G. However, the present invention is not limited to this. Only 26 may be heated or cooled.

そして、型開きする前に、射出成形品Ｊの表面に型内塗装を施す場合には、図５又は図７に示す状態において、射出成形品Ｊの外周に形成された隙間Ｇに熱硬化性の塗料を適量注入する。この場合、熱媒体通路３１と３２とに、又は熱媒体通路３２のみに加熱用媒体を流して、固定金型部６と可動金型部２６とを、又は可動金型部２６のみを熱膨張させて成形品Ｊをプレス（押圧）すると共にこの塗料を硬化させ、射出成形品Ｊの表面に塗料を圧着させる。この場合、前述したように、両金型部６、２６を昇温することにより、合成樹脂の転写性の向上が図れて、既に射出成形品Ｊの意匠面を綺麗に仕上げることができているので、塗料の膜厚が薄くとも、塗装面の品質の向上が図れる。   Then, in the case where in-mold coating is applied to the surface of the injection molded product J before opening the mold, in the state shown in FIG. 5 or 7, the thermosetting property is formed in the gap G formed on the outer periphery of the injection molded product J. Inject an appropriate amount of paint. In this case, a heating medium is allowed to flow through the heat medium passages 31 and 32, or only through the heat medium passage 32, and the fixed mold portion 6 and the movable mold portion 26 or only the movable mold portion 26 is thermally expanded. Then, the molded product J is pressed (pressed), and the paint is cured, so that the paint is pressed onto the surface of the injection molded product J. In this case, as described above, by raising the temperature of both mold parts 6 and 26, the transferability of the synthetic resin can be improved, and the design surface of the injection molded product J has already been finished finely. Therefore, the quality of the painted surface can be improved even if the coating film is thin.

然る後、熱媒体通路３１と３２とから、又は熱媒体通路３２から加熱媒体を排出して、今度は前記両通路３１と３２、又は前記通路３２のみに冷却用媒体を流すことにより、射出成形品Ｊ表面と固定金型部６との間、特に射出成形品Ｊの垂直壁と固定金型部６の垂直面との間に空間（隙間）を生じさせて、型開きをスムーズすると共に射出成形品Ｊの垂直壁表面（意匠面）の傷付きを防止できる。   Thereafter, the heating medium is discharged from the heat medium passages 31 and 32, or from the heat medium passage 32, and this time, the cooling medium is allowed to flow through both the passages 31 and 32 or only the passage 32. A space (gap) is created between the surface of the molded product J and the fixed mold portion 6, particularly between the vertical wall of the injection molded product J and the vertical surface of the fixed mold portion 6, thereby smoothing the mold opening. It is possible to prevent the vertical wall surface (design surface) of the injection molded product J from being damaged.

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, and the present invention is not limited to the above-described various modifications without departing from the spirit of the present invention. Including alternatives, modifications or variations.

６ 固定金型部
２６ 可動金型部
３１ 熱媒体通路
３２ 熱媒体通路
３６、３７ 隙間
３８ シボ加工面
Ｇ 隙間
Ｊ 射出成形品
Ｓ キャビティ 6 Fixed mold part 26 Movable mold part 31 Heat medium passage 32 Heat medium passages 36, 37 Gap 38 Textured surface G 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、
前記可動金型の熱膨張を見込んで前記固定金型と可動金型との間に予め形成された隙間を前記可動金型を加熱することにより熱膨張させて前記隙間を無くし、
この隙間を無くした状態で溶融した合成樹脂をキャビティ内に注入充填し、
その後、前記可動金型を冷却して熱収縮させると共に合成樹脂も熱収縮させて、合成樹脂成形品の外表面と固定金型との間に空間を形成す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 molten synthetic resin is injected and filled into a cavity.
In anticipation of thermal expansion of the movable mold, the gap formed in advance between the fixed mold and the movable mold is thermally expanded by heating the movable mold to eliminate the gap.
Fill and fill the cavity with synthetic resin that has been melted with this gap removed,
Thereafter, the movable mold is cooled and thermally contracted, and the synthetic resin is also thermally contracted to form a space between the outer surface of the synthetic resin molded product and the fixed mold. 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、
前記可動金型の熱膨張を見込んで前記固定金型と可動金型との間に予め形成された隙間を前記可動金型を加熱することにより熱膨張させて前記隙間を無くし、
この隙間を無くした状態で溶融した合成樹脂をキャビティ内に注入充填し、
その後、前記可動金型を冷却して熱収縮させると共に合成樹脂も熱収縮させて、合成樹脂成形品の外表面と固定金型との間に空間を形成し、
この空間内に熱硬化性の塗料を注入した後に、少なくとも可動金型を加熱して熱膨張させて前記注入された塗料を前記合成樹脂成形品にプレスすると共に硬化させ、
この塗料を硬化した後に、少なくとも可動金型を冷却する
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,
In anticipation of thermal expansion of the movable mold, the gap formed in advance between the fixed mold and the movable mold is thermally expanded by heating the movable mold to eliminate the gap.
Fill and fill the cavity with synthetic resin that has been melted with this gap removed,
Thereafter, the movable mold is cooled and thermally contracted, and the synthetic resin is also thermally contracted to form a space between the outer surface of the synthetic resin molded product and the fixed mold,
After injecting a thermosetting paint into this space, at least the movable mold is heated and thermally expanded to press and cure the injected paint on the synthetic resin molded product,
An injection molding method comprising cooling at least the movable mold after curing the paint.
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