JP3724264B2 - Manufacturing method of resin injection molded product and injection mold - Google Patents

Manufacturing method of resin injection molded product and injection mold Download PDF

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Publication number
JP3724264B2
JP3724264B2 JP20113899A JP20113899A JP3724264B2 JP 3724264 B2 JP3724264 B2 JP 3724264B2 JP 20113899 A JP20113899 A JP 20113899A JP 20113899 A JP20113899 A JP 20113899A JP 3724264 B2 JP3724264 B2 JP 3724264B2
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Prior art keywords
plate
injection
molding space
resin
groove
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JP2001026037A (en
Inventor
隆生 山下
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Shin Kobe Electric Machinery Co Ltd
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Shin Kobe Electric Machinery Co Ltd
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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
    • B29C45/14—Injection 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
    • B29C45/14336—Coating a portion of the article, e.g. the edge of the article
    • B29C45/14344—Moulding in or through a hole in the article, e.g. outsert moulding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection 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
    • B29C45/14065—Positioning or centering articles in the mould

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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)

Description

【０００１】
【発明の属する技術分野】
本発明は、プレートをインサート物とし、プレートの表裏両面に樹脂被覆を施した射出成形品を製造する方法に関する。また、その製造に用いる射出成形金型に関する。
【０００２】
【従来の技術】
鉄板等のプレートをインサート物として、その表裏両面それぞれの少なくとも一部に樹脂被覆を施した射出成形品を製造する場合、成形金型には、成形金型に位置決めしたプレートを挟んでその両側に樹脂被覆を施すための成形空間が必要である。成形空間はプレートを挟んで分けられ、プレートは、いわば成形空間に浮いた状態にある。インサート物の配置や成形品の形状の制約から、プレートを挟んで分けられた成形空間の一方の側に配置した射出部から成形空間に溶融樹脂を射出して成形を行なわなけれならない場合、射出部から成形空間に射出した溶融樹脂は、まず、プレートを挟んで分けられた成形空間の射出部側空間を満たし、その後、プレート周囲からプレート反対側の空間に流入し当該空間を満たす。一瞬の短い時間ではあるが、プレートを挟んで分けられた成形空間の射出部側空間を溶融樹脂が満たしつつある間、プレートを挟んでその反対側の成形空間は少なくとも樹脂被覆の厚み分が空洞のままであるので、溶融樹脂の射出圧力でプレートが湾曲して変形することがしばしばあった。
【０００３】
このようなプレートの変形を防止する対策として、次のような手段が考えられる。
（１）図３に示すように、成形金型１にインサート物であるプレート２を位置決めし、プレート２を挟んで分けられた成形空間の射出部３側とは反対側の空間にプレート２を支持する第二のインサート物４を位置決めして、射出部３から成形空間に溶融樹脂を射出する。溶融樹脂は、まず、プレート２を挟んで分けられた成形空間の射出部３側空間を満たし、その後、プレート周囲からプレート反対側の空間に流入して当該空間を満たす。第二のインサート物４がプレート２を支え、プレート２の変形を防止している。
（２）図４に示すように、プレート２を挟んで分けられた成形空間の射出部３側空間とは反対側の空間にピン５を突出させ、このピン５でプレート２を支持した状態で溶融樹脂を射出する。
（３）図５に示すように、予め片面に樹脂被覆６を施したプレート２をインサート物とし、前記樹脂被覆６側を成形金型１に当接して樹脂で覆っていない側の成形空間に溶融樹脂を射出する。
【０００４】
【発明が解決しようとする課題】
しかしながら、上記（１）の手段ではインサート物の個数が増え成形作業が繁雑になる問題がある。また、（２）の手段では成形品のピン位置との対応箇所に凹陥部ができ、たとえ樹脂被覆を施したい箇所であっても凹陥部底面にはプレートが露出することになる。さらに、（３）の手段ではプレートの表裏両面に樹脂被覆を施すために、プレートをインサート物とする射出成形を２回実施することになるので工数増加となる。
【０００５】
本発明が解決しようとする課題は、プレートをインサート物として配置し、そのプレートにより分けられた成形空間に、一方の成形空間側に配置した射出部から溶融樹脂を射出して、プレートの表裏面それぞれの少なくとも一部に樹脂被覆を施す射出成形品の製造において、プレートを変形させずに射出部側とは反対側のプレート面も必要箇所に樹脂被覆を施すことができるようにし、かつ効率よく成形することである。
【０００６】
【課題を解決するための手段】
上記課題を解決するために、本発明に係る方法は、インサート物として成形金型に位置決めしたプレートを挟んで分けられた成形空間の溶融樹脂射出部側とは反対側のプレート面に樹脂被覆を施すための成形空間に、前記射出部と直接つながる溝を設けて射出成形を行なうことを特徴とする。この溝は、射出部側とは反対側のプレート面樹脂被覆にリブを一体成形するためのものである。
すなわち、請求項１に係る発明は、以下に説明するとおりである。
上記プレートは、射出部から外して配置する。そして、プレートを挟んで射出部とは反対側の成形空間には、射出部と対応する位置に溝を設ける。このような構成と位置関係で、射出部から前記溝に樹脂を直接充填することによりリブを形成し、当該リブをプレートの樹脂被覆に一体成形する。
【０００７】
上記溝は、射出部と対応する位置関係にあり、射出部に直接つながっているので、射出部から成形空間に射出した溶融樹脂はいち早く前記溝を満たす。プレートを挟んで分けられた成形空間の射出部側空間を溶融樹脂が満たしつつあるとき、リブを形成するために前記溝を満たした溶融樹脂がプレートを支えているので、射出圧力によるプレートの変形を防止することができる。溝を満たした溶融樹脂は、順次、射出部側とは反対側のプレート面を覆うように広がっていく。
【０００８】
【発明の実施の形態】
図面を参照しながら、以下、発明の実施の形態を説明する。
【０００９】
参考例１(図１参照)
インサート物としてプレート２（鉄板）を成形金型１に位置決めする。成形空間はプレート２によりほぼ二つに分けられ、前記分けられた成形空間の一方の側に配置した射出部３から成形空間に溶融樹脂を射出して成形を行なう。使用する樹脂は、ポリブチレンテレフタレート、ポリプロピレン等である。
溶融樹脂の射出部３は、プレート２に相対し、また、プレート２を挟んで射出部３が位置する側とは反対側の樹脂被覆を施すための成形空間には、溝７が設けられている。この溝７は、プレート２にあけた貫通穴８を通して射出部３と直接つながっている。
射出部３から成形空間に溶融樹脂を射出すると、溶融樹脂は射出部３と直接つながった溝７をいち早く満たすと共に射出部３が位置する側の成形空間を満たしていく。また、溝７を満たした溶融樹脂は、射出部３が位置する側とは反対側の成形空間を順次満たしていく。プレート２が溶融樹脂の射出圧力を受けるとき、溝７を満たした溶融樹脂が反対側からプレート２を支える作用をするので、射出圧力によるプレート２の変形を回避することができる。溝７を満たした溶融樹脂は、プレート２に施す樹脂被覆と一体化したリブを形成するものである。
【００１０】
実施例１(図２参照)
この発明の実施の形態においては、射出部３は、プレート２から外れた位置にあり、プレート２によりほぼ二つに分けられた成形空間の一方の側に位置している。また、プレート２を挟んで射出部３が位置する側とは反対側の成形空間に設けられた溝７は、射出部３と直接つながっている。この溝７は、プレート２に相対する位置まで伸びている。
射出部３から成形空間に溶融樹脂を射出すると、溶融樹脂は射出部３と直接つながっ溝７をいち早く満たすと共に射出部３が位置する側の成形空間を満たしていく。また、溝７を満たした溶融樹脂は、射出部３が位置する側とは反対側の成形空間を順次満たしていく。プレート２が溶融樹脂の射出圧力を受けるとき、溝７を満たした溶融樹脂が反対側からプレート２を支える作用をするので、射出圧力によるプレート２の変形を回避することができる。溝７を満たした溶融樹脂は、プレート２に施す樹脂被覆と一体化したリブを形成するものである。
【００１１】
上記参考例１と実施例１における射出部３は、プレート２により分けられた成形空間の一方の側に、一箇所又は複数箇所配置することができる。また、前記射出部３を配置した側に、溝７に直接つながらない射出部を併せて配置するようにしてもよい。
【００１２】
【発明の効果】
上述のように、本発明に係る方法によれば、インサート物であるプレートを挟んで一方の側の成形空間に射出した溶融樹脂をいち早く反対側の成形空間に導いて、プレートを樹脂射出側とは反対側から支持することができる。これにより、プレートを支持する別部材を用意することなく、プレートの両面を樹脂で被覆した樹脂射出成形品を効率よく製造することができる。
【図面の簡単な説明】
【図１】 参考例１を示す要部断面図である。
【図２】 本発明の実施の形態を示す要部断面図である。
【図３】 プレートをインサート物とする従来の樹脂射出成形方法を示す断面図である。
【図４】 プレートをインサート物とする従来の別の樹脂射出成形方法を示す断面図である。
【図５】 プレートをインサート物とする従来のさらに別の樹脂射出成形方法を示す断面図である。
【符号の説明】
１は成形金型
２はプレート
３は射出部
４は第二のインサート物
５はピン
６は樹脂被覆
７は溝
８は貫通穴[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method of manufacturing an injection-molded article in which a plate is used as an insert, and both front and back surfaces of the plate are coated with a resin. Moreover, it is related with the injection mold used for the manufacture.
[0002]
[Prior art]
When manufacturing an injection-molded product in which at least a part of each of the front and back sides is coated with a plate such as an iron plate as an insert, the mold is placed on both sides of the plate positioned on the mold. A molding space for applying the resin coating is required. The molding space is divided with a plate in between, and the plate is in a state of floating in the molding space. If the injection part must be injected from the injection part placed on one side of the molding space divided across the plate due to restrictions on the arrangement of the inserts and the shape of the molded product, the injection part must be molded. The molten resin injected into the molding space first fills the injection portion side space of the molding space divided across the plate, and then flows into the space on the opposite side of the plate from the periphery of the plate to fill the space. Although it is a short time, while the molten resin is filling the injection side space of the molding space divided across the plate, at least the thickness of the resin coating is hollow in the molding space on the opposite side of the plate As a result, the plate was often bent and deformed by the injection pressure of the molten resin.
[0003]
As measures for preventing such deformation of the plate, the following means can be considered.
(1) As shown in FIG. 3, the plate 2 as an insert is positioned on the molding die 1, and the plate 2 is placed in a space opposite to the injection portion 3 side of the molding space divided across the plate 2. The second insert 4 to be supported is positioned, and the molten resin is injected from the injection portion 3 into the molding space. The molten resin first fills the space on the injection part 3 side of the molding space divided with the plate 2 interposed therebetween, and then flows into the space on the opposite side of the plate from the periphery of the plate to fill the space. The second insert 4 supports the plate 2 and prevents the plate 2 from being deformed.
(2) As shown in FIG. 4, in a state where the pin 5 is projected into a space opposite to the injection portion 3 side space of the molding space divided across the plate 2, and the plate 2 is supported by this pin 5. Inject molten resin.
(3) As shown in FIG. 5, the plate 2 having a resin coating 6 on one side in advance is used as an insert, and the resin coating 6 side is brought into contact with the molding die 1 and is not covered with resin. Inject molten resin.
[0004]
[Problems to be solved by the invention]
However, the means (1) has a problem that the number of inserts increases and the molding operation becomes complicated. In the means (2), a concave portion is formed at a location corresponding to the pin position of the molded product, and the plate is exposed on the bottom surface of the concave portion even at a location where resin coating is desired. Further, in the means (3), since the resin coating is applied to both the front and back surfaces of the plate, the injection molding using the plate as an insert is performed twice, which increases the number of steps.
[0005]
The problem to be solved by the present invention is that a plate is arranged as an insert, and molten resin is injected into a molding space divided by the plate from an injection portion arranged on one molding space side. In the production of injection molded products in which at least a part of each is coated with a resin, the plate surface on the side opposite to the injection part can be coated with a resin on the necessary part without deforming the plate and efficiently. Is to mold.
[0006]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the method according to the present invention provides a resin coating on a plate surface opposite to a molten resin injection part side of a molding space divided with a plate positioned on a molding die as an insert. Injection molding is performed by providing a groove directly connected to the injection portion in a molding space for application. This groove is for integrally forming a rib on the plate surface resin coating on the side opposite to the injection portion side.
That is, the invention according to claim 1 is as described below.
The plate is disposed away from the injection portion . Then, a groove is provided at a position corresponding to the injection part in the molding space opposite to the injection part across the plate. In a positional relationship such a configuration, to form a rib by filling the resin directly into the groove from the injection unit, it is integrally formed the rib in the resin coating of the plate.
[0007]
Since the groove has a positional relationship corresponding to the injection part and is directly connected to the injection part, the molten resin injected from the injection part into the molding space quickly fills the groove. When the molten resin is filling the injection part side space of the molding space divided across the plate, the molten resin filling the groove supports the plate to form a rib, so the deformation of the plate due to injection pressure Can be prevented. The molten resin filling the groove is sequentially spread so as to cover the plate surface opposite to the injection portion side.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the invention will be described with reference to the drawings.
[0009]
Reference example 1 (see Figure 1)
A plate 2 (iron plate) is positioned on the molding die 1 as an insert. The molding space is divided roughly into two by the plate 2 and molding is performed by injecting molten resin into the molding space from the injection part 3 disposed on one side of the divided molding space. The resin used is polybutylene terephthalate, polypropylene or the like.
The molten resin injection portion 3 is opposed to the plate 2, and a groove 7 is provided in a molding space for applying a resin coating opposite to the side where the injection portion 3 is located across the plate 2. Yes. The groove 7 is directly connected to the injection portion 3 through a through hole 8 formed in the plate 2.
When the molten resin is injected from the injection part 3 into the molding space, the molten resin quickly fills the groove 7 directly connected to the injection part 3 and fills the molding space on the side where the injection part 3 is located. The molten resin filling the grooves 7 sequentially fills the molding space on the side opposite to the side where the injection part 3 is located. When the plate 2 receives the injection pressure of the molten resin, the molten resin filling the groove 7 acts to support the plate 2 from the opposite side, so that deformation of the plate 2 due to the injection pressure can be avoided. The molten resin filling the grooves 7 forms ribs integrated with the resin coating applied to the plate 2.
[0010]
Example 1 (see FIG. 2)
In the embodiment of the present invention, the injection portion 3 is located away from the plate 2, and is located on one side of the molding space divided roughly by the plate 2. Further, the groove 7 provided in the molding space opposite to the side where the injection part 3 is located with the plate 2 interposed therebetween is directly connected to the injection part 3. The groove 7 extends to a position facing the plate 2.
When molten resin is injected from the injection part 3 into the molding space, the molten resin is directly connected to the injection part 3 and quickly fills the groove 7 and fills the molding space on the side where the injection part 3 is located. Further, the molten resin filling the groove 7 sequentially fills the molding space on the side opposite to the side where the injection part 3 is located. When the plate 2 receives the injection pressure of the molten resin, the molten resin filling the groove 7 acts to support the plate 2 from the opposite side, so that deformation of the plate 2 due to the injection pressure can be avoided. The molten resin filling the grooves 7 forms ribs integrated with the resin coating applied to the plate 2.
[0011]
The injection part 3 in the reference example 1 and the example 1 can be arranged at one place or a plurality of places on one side of the molding space divided by the plate 2. Moreover, you may make it arrange | position together the injection | pouring part which does not connect directly to the groove | channel 7 on the side which has arrange | positioned the said injection | pouring part 3. FIG.
[0012]
【The invention's effect】
As described above, according to the method of the present invention, the molten resin injected into the molding space on one side across the plate as an insert is quickly guided to the molding space on the opposite side, and the plate is set as the resin injection side. Can be supported from the opposite side. Thereby, the resin injection molded product which coat | covered both surfaces of the plate with resin can be manufactured efficiently, without preparing the separate member which supports a plate.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a main part showing a reference example 1 ;
FIG. 2 is a cross-sectional view of a main part showing an embodiment of the present invention.
FIG. 3 is a cross-sectional view showing a conventional resin injection molding method using a plate as an insert.
FIG. 4 is a cross-sectional view showing another conventional resin injection molding method using a plate as an insert.
FIG. 5 is a cross-sectional view showing still another conventional resin injection molding method using a plate as an insert.
[Explanation of symbols]
1 is a molding die 2 is a plate 3 is an injection part 4 is a second insert 5 is a pin 6 is a resin coating 7 is a groove 8 is a through hole

Claims (2)

成形金型にインサート物としてプレートを配置し、当該プレートを挟んで分けられた成形空間に、一方の成形空間側に配置した射出部から溶融樹脂を射出して、プレートの表裏面それぞれの少なくとも一部に樹脂被覆を施す射出成形品の製造において、
前記プレートは、射出部から外して配置し、
プレートを挟んで射出部とは反対側の成形空間には、射出部と対応する位置に溝を設け、
射出部から前記溝に樹脂を直接充填することによりリブを形成し、当該リブをプレートの樹脂被覆に一体成形することを特徴とする樹脂射出成形品の製造法。A plate is placed as an insert in a molding die, and molten resin is injected into a molding space divided by sandwiching the plate from an injection part arranged on one molding space side, so that at least one of the front and back surfaces of the plate is provided. In the production of injection-molded products with resin coating on the parts,
The plate is arranged away from the injection part,
In the molding space opposite to the injection part across the plate , a groove is provided at a position corresponding to the injection part ,
Preparation of the resin injection molded article, characterized in that to form a rib, is integrally formed the rib in the resin coating of the plate by filling the resin directly into the groove from the injection unit. インサート物として配置するプレートを挟んで分けられ、かつ、プレートの表裏面それぞれの少なくとも一部に樹脂被覆を施すための成形空間を有し、前記分けられた成形空間の一方側に溶融樹脂の射出部が位置した射出成形金型において、It is divided across a plate to be arranged as an insert, and has a molding space for applying a resin coating to at least a part of each of the front and back surfaces of the plate, and injection of molten resin on one side of the divided molding space In the injection mold where the part is located,
前記射出部は、プレートから外した位置に配置されており、  The injection part is arranged at a position removed from the plate,
プレートを挟んで分けられる成形空間の射出部とは反対側の成形空間に前記射出部と対応する位置関係で溝を備えてなり、前記溝はプレートの樹脂被覆にリブを一体成形するための溝であることを特徴とする射出成形金型。  A groove is provided in a molding space on the opposite side to the injection portion of the molding space divided across the plate in a positional relationship corresponding to the injection portion, and the groove is a groove for integrally forming a rib on the resin coating of the plate. An injection mold characterized by being.
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WO2004058478A1 (en) * 2002-12-25 2004-07-15 Honda Motor Co., Ltd. Method and device for injection molding
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