JPH02139215A - Composite injection-molded body, method thereof and composite injection-molding equipment - Google Patents
Composite injection-molded body, method thereof and composite injection-molding equipmentInfo
- Publication number
- JPH02139215A JPH02139215A JP1066542A JP6654289A JPH02139215A JP H02139215 A JPH02139215 A JP H02139215A JP 1066542 A JP1066542 A JP 1066542A JP 6654289 A JP6654289 A JP 6654289A JP H02139215 A JPH02139215 A JP H02139215A
- Authority
- JP
- Japan
- Prior art keywords
- molded body
- recess
- mold
- primary molded
- resin
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000001746 injection moulding Methods 0.000 title claims abstract description 47
- 239000002131 composite material Substances 0.000 title claims description 58
- 238000000034 method Methods 0.000 title abstract description 20
- 229920005989 resin Polymers 0.000 claims abstract description 80
- 239000011347 resin Substances 0.000 claims abstract description 80
- 238000003825 pressing Methods 0.000 claims abstract description 43
- 238000007789 sealing Methods 0.000 claims abstract description 10
- 238000002347 injection Methods 0.000 claims description 49
- 239000007924 injection Substances 0.000 claims description 49
- 238000000465 moulding Methods 0.000 claims description 22
- 230000002093 peripheral effect Effects 0.000 claims description 12
- 229920000642 polymer Polymers 0.000 claims description 5
- 208000031872 Body Remains Diseases 0.000 claims 1
- 229920002292 Nylon 6 Polymers 0.000 abstract description 8
- 229920002379 silicone rubber Polymers 0.000 abstract description 8
- 239000004945 silicone rubber Substances 0.000 abstract description 8
- 239000003365 glass fiber Substances 0.000 abstract description 5
- 229920005992 thermoplastic resin Polymers 0.000 description 5
- 238000000071 blow moulding Methods 0.000 description 4
- 229920001187 thermosetting polymer Polymers 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- -1 polyethylene Polymers 0.000 description 3
- 239000004743 Polypropylene Substances 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229920000728 polyester Polymers 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000012790 adhesive layer Substances 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 210000000078 claw Anatomy 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical compound C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 229920006305 unsaturated polyester Polymers 0.000 description 1
Landscapes
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は複合射出成形体及びその成形方法並びに複合射
出成形装置に関し、更に詳しくは少な（とも二種類の第
１及び第２の樹脂から成る複合射出成形体及びその成形
方法並びに複合射出成形装置に関する。Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a composite injection molded article, a method for molding the same, and a composite injection molding apparatus, and more specifically relates to a composite injection molded article (both consisting of two types of first and second resins). The present invention relates to a composite injection molded article, a method for molding the same, and a composite injection molding device.
（従来の技術）
近年においては、自動車、家庭用電気機器、カメラ、容
器等の軽量化の要請から各種機械、装置等を構成する部
品が金属製から樹脂製に変換されつつある。(Prior Art) In recent years, parts constituting various machines, devices, etc. are being converted from metal to resin due to the demand for lighter weight automobiles, household electrical appliances, cameras, containers, etc.
かかる樹脂製の部品は、通常、複数個の成形体（以下、
一次成形体と称する）が組付けされて構成されており、
一次成形体の組付は部分には、そのシール性を保つため
、或いはクツション性又はが設けられている。Such resin parts are usually made up of multiple molded bodies (hereinafter referred to as
(referred to as the primary molded body) are assembled together.
The assembly portion of the primary molded body is provided with cushioning properties or cushioning properties in order to maintain its sealing properties.
従来、この様な二次成形体は、一次成形体とは別途に成
形されてから人手によって一次成形体に組付けられてい
るため、組付精度が劣り且つ組付工数が極めて大きくな
る等欠点があった。Conventionally, such secondary molded bodies are molded separately from the primary molded body and then assembled to the primary molded body by hand, resulting in disadvantages such as poor assembly accuracy and extremely large assembly man-hours. was there.
かかる欠点を解消し得る方法として、特開昭６０−５２
３２２号公報或いは特開昭６３−１０４８０９号公報に
は、射出成形によって表面に凹部が形成されている一次
成形体を得、次いで前記一次成形体の凹部に二次成形体
を形成する弾性重合体を射出充填する複合射出成形方法
が提案されている。As a method that can eliminate such drawbacks, Japanese Patent Application Laid-Open No. 60-52
No. 322 or JP-A No. 63-104809 discloses an elastic polymer in which a primary molded body having a concave portion formed on the surface is obtained by injection molding, and then a secondary molded body is formed in the concave portion of the primary molded body. A composite injection molding method for injection filling has been proposed.
（発明が解決しようとする課題）
前記複合射出成形方法によれば、一次成形体とシール部
材等の二次成形体とが組付けられている複合成形体が射
出成形によって一度に成形することができるため、組付
精度の大幅な向上及び組付工数の著しい低減を図ること
ができる。(Problems to be Solved by the Invention) According to the composite injection molding method, a composite molded article in which a primary molded article and a secondary molded article such as a sealing member are assembled can be molded at once by injection molding. Therefore, it is possible to significantly improve assembly accuracy and significantly reduce assembly man-hours.
しかしながら、一次成形体は射出成形によって成形され
るため、射出成形機からの成形品取出等のハンドリング
性を良好に保つべく、得られる一次成形体の凹部は、そ
の壁面が底面に対して略垂直状態となる様′に形成され
る。However, since the primary molded product is molded by injection molding, in order to maintain good handling properties such as taking out the molded product from the injection molding machine, the recessed part of the resulting primary molded product has a wall surface that is approximately perpendicular to the bottom surface. It is formed in such a way that it becomes a state.
かかる一次成形体の凹部に射出充填された二次成形体は
、前記凹部壁面に何等の抜は止め手段が形成されていな
いため、外力によって容易に抜き出され易い。The secondary molded product injected and filled into the recess of such a primary molded product is easily pulled out by external force because no removal preventing means is formed on the wall surface of the recess.
このため、この様な一次成形体の凹部に二次成形体を強
固に固着するためには、前掲の特開昭６３−１０４８０
９号公報に提案されている如く、一次成形体の凹部底面
と二次成形体との間に反応性エラストマー層やブライマ
ー層を形成して両者を接着させることを要する。Therefore, in order to firmly fix the secondary molded body to the concave portion of such a primary molded body, the above-mentioned Japanese Patent Application Laid-Open No. 63-10480
As proposed in Japanese Patent No. 9, it is necessary to form a reactive elastomer layer or a brimer layer between the bottom of the recess of the primary molded body and the secondary molded body to bond them together.
そこで、本発明の目的は、一次成形体と二次成形とから
成る複合成形体が射出成形によって成形され、且つ二次
成形体が一次成形体の凹部に接着層を介することなく強
固に固着されている複合射出成形体及びその成形方法並
びに複合射出成形装置を提供することにある。SUMMARY OF THE INVENTION Therefore, an object of the present invention is to mold a composite molded body consisting of a primary molded body and a secondary molded body by injection molding, and to firmly adhere the secondary molded body to the recessed portion of the primary molded body without using an adhesive layer. An object of the present invention is to provide a composite injection molded article, a method for molding the same, and a composite injection molding apparatus.
（課題を解決するための手段）
本発明者等は、前記目的を達成すべ（種々検討を重ねた
結果、射出成形で得られる一次成形体に形成される凹部
の周辺部を押圧しつつ凹部壁面を凹部内に突出させてア
ンダーカット部を形成し、次いで前記一次成形体の凹部
に二次成形体を形成する樹脂を射出充填することによっ
て、一次成形体凹部壁面に二次成形体の抜は止め部が形
成されるため、二次成形体が一次成形体に強固に固着さ
れることを見い出し、本発明に到達した。(Means for Solving the Problems) The present inventors have found that it is possible to achieve the above-mentioned object (as a result of various studies), while pressing the periphery of the recess formed in the primary molded product obtained by injection molding, the recess wall surface By projecting into the recess to form an undercut portion, and then injecting and filling the recess of the primary molded body with a resin for forming the secondary molded body, the secondary molded body is cut out from the wall surface of the recess of the primary molded body. It has been discovered that the secondary molded body is firmly fixed to the primary molded body because the stop portion is formed, and the present invention has been achieved.
即ち、本発明の第１の発明は、少なくとも二種類の第１
及び第２の樹脂から成り、第１の樹脂で形成される一次
成形体と第２の樹脂で形成される二次成形体とによって
構成される複合射出成形体において、該二次成形体との
接合面に設けられている一次成形体の凹部には、凹部壁
面の少なくとも一部が凹部内に突出してアンダーカット
部が形成され、且つ第２の樹脂が充填されて二次成形体
の一部を構成することを特徴とする複合射出成形体であ
る。That is, the first invention of the present invention provides at least two types of first
and a second resin, in a composite injection molded article composed of a primary molded article made of the first resin and a secondary molded article made of the second resin, the combination of the secondary molded article and the secondary molded article is At least a part of the wall surface of the recess protrudes into the recess to form an undercut part in the recess of the primary molded body provided on the joint surface, and is filled with a second resin to form a part of the secondary molded object. This is a composite injection molded article characterized by comprising:
また、本発明の第２の発明は、少な（とも二種類の第１
及び第２の樹脂から成り、第１の樹脂で形成される一次
成形体と第２の樹脂で形成される二次成形体とによって
構成される複合成形体を射出成形する際に、先ず二次成
形体との接合面となる部位に凹部を有する一次成形体を
形成し、次いで該一次成形体の前記凹部の周辺部の少な
くとも一部を押圧して凹部壁面部を凹部内に突出させて
凹部にアンダーカット部を設け、その後、前記凹部及び
金型のキャビティ内に第２の樹脂を射出充填することを
特徴とする複合射出成形方法である。In addition, the second invention of the present invention is characterized in that a small number of (both two types of first
and a second resin, and when injection molding a composite molded body composed of a primary molded body formed of the first resin and a secondary molded body formed of the second resin, first the secondary molded body is A primary molded body having a concave portion at a portion that will be a joint surface with the molded body is formed, and then at least a portion of the periphery of the concave portion of the primary molded body is pressed to cause the wall surface portion of the concave portion to protrude into the concave portion to form the concave portion. This composite injection molding method is characterized in that an undercut portion is provided in the mold, and then a second resin is injected and filled into the recess and the cavity of the mold.
更に、本発明の第３の発明は、少なくとも二種類の第１
及び第２の樹脂から成り、第１の樹脂で形成される一次
成形体と第２の樹脂で形成される二次成形体とによって
構成される複合成形体を射出成形する装置であって、二
次成形体との接合面となる部位に凹部を有する一次成形
体を成形する一対の金型と、得られる一次成形体の前記
凹部の周辺部の少なくとも一部を押圧して凹部壁面部を
凹部内に突出させて凹部にアンダーカット部を形成する
ための押圧部を有する金型と、前記一次成形体を収容し
且つ二次成形体を形成するキャビティを有し、該キャビ
ティ内及び一次成形体の前記凹部内に第２の樹脂を射出
充填する一対の金型とを具備することを特徴とする複合
射出成形装置である。Furthermore, the third invention of the present invention provides at least two types of the first
and a second resin, and an apparatus for injection molding a composite molded body constituted by a primary molded body formed of the first resin and a secondary molded body formed of the second resin, the apparatus comprising: A pair of molds for molding a primary molded body having a concave portion at a portion that will be a joint surface with a subsequent molded body; and a mold for forming a concave wall portion by pressing at least a portion of the peripheral portion of the concave portion of the resulting primary molded body. a mold having a pressing part for protruding inward to form an undercut in the concave part; and a cavity for accommodating the primary molded body and forming a secondary molded body; and a pair of molds for injecting and filling the second resin into the recessed portion of the composite injection molding apparatus.
かかる本発明の第２の発明である複合射出成形方法にお
いて、一次成形体の凹部周辺部の押圧が金型に設けられ
ている突起部による押圧、又は凹部周辺部に予め形成さ
れている凸部の押圧、或いは凹部側壁の少なくとも一方
の押圧によってなされることか、一次成形体の凹部にア
ンダーカット部を容易に設けることができる。In the composite injection molding method according to the second aspect of the present invention, the pressure on the periphery of the recess of the primary molded article is caused by a projection provided on the mold, or a projection formed in advance around the recess. The undercut portion can be easily provided in the recess of the primary molded body by pressing the recess or pressing at least one of the side walls of the recess.
更に、二次成形体を形成する第２の樹脂の射出充填が一
次成形体の凹部開口部の全周辺部を押圧−しつつなされ
ることが、シリコンゴム等の表面張力が極めて小さい第
２の樹脂を射出充填する場合においても、二次成形体の
周辺部に発生し易いパリを有効に防止することができる
。Furthermore, it is possible to inject and fill the second resin forming the secondary molded body while pressing the entire periphery of the recess opening of the primary molded body. Even in the case of injection filling with resin, it is possible to effectively prevent frustation that tends to occur in the periphery of the secondary molded body.
また、本発明の第３の発明である複合射出装置において
、一次成形体の凹部周辺部を押圧する金型の押圧部が突
起部、又は前記凹部側壁の少な（とも一方を押圧する押
圧部であることが一次成形体の凹部にアンダーカット部
を容易に形成することができる。Further, in the composite injection device according to the third aspect of the present invention, the pressing part of the mold that presses the peripheral part of the recess of the primary molded product is a protrusion, or a pressing part that presses one of the side walls of the recess. One thing is that an undercut portion can be easily formed in the recessed portion of the primary molded body.
或いは一次成形体を成形する一対の金型が凹部周辺部に
凸部を有する一次成形体を得ることができるキャビティ
を形成するものであっても、得られる一次成形体の凹部
周辺部に形成される凸部を押圧することによって、前記
凹部内に容易にアンダーカット部を形成することができ
る。Alternatively, even if a pair of molds for molding the primary molded product form a cavity that can obtain a primary molded product having a convex portion around the concave portion, it is possible to form a cavity around the concave portion of the resulting primary molded product. By pressing the convex portion, an undercut portion can be easily formed within the concave portion.
更に、一次成形体を形成する一対の金型のうち、一次成
形体を形成してから型開きする際に一次成形体が付着残
留する側の金型を、一次成形体の凹部にアンダーカット
部を形成する押圧部を有する金型と組合わせる金型に共
用又は二次成形体を成形する一対の金型のうち一次成形
体を収容する金型に共用することが好適である。Furthermore, of the pair of molds for forming the primary molded body, the mold on the side where the primary molded body will remain attached when the mold is opened after forming the primary molded body is placed in the recessed part of the primary molded body with an undercut portion. It is preferable to use it in common with a mold that is combined with a mold having a pressing part that forms a mold, or in a mold that accommodates a primary molded object among a pair of molds that mold a secondary molded object.
特に、一次成形体を形成する第２の樹脂を射出充填する
金型内に、一次成形体の凹部開口部の全周辺部を押圧す
る押圧部が設けられていることが、一次成形体の凹部開
口部の全周辺部を押圧しつつ第２の樹脂を一次成形体の
凹部に射出充填することができるため、二次成形体の成
形時に発生し易いパリを効果的に防止することができる
。In particular, it is preferable that a pressing part for pressing the entire periphery of the opening of the recess of the primary molded object is provided in the mold for injecting and filling the second resin forming the primary molded object. Since the second resin can be injected and filled into the concave portion of the primary molded body while pressing the entire periphery of the opening, it is possible to effectively prevent flashing that tends to occur during molding of the secondary molded body.
この様な本発明は、二種類の第１及び第２樹脂が非相溶
性樹脂、或いは第２の樹脂で形成される二次成形体が弾
性重合体から成るシール部材、クツション部材、或いは
防滑部材である場合に通用することが、特に好適である
。The present invention provides a sealing member, a cushioning member, or an anti-slip member in which the two types of first and second resins are incompatible resins, or the secondary molded body formed from the second resin is an elastic polymer. It is particularly preferable that it is applicable when .
尚、本発明において言う「アンダーカット部」とは、凹
部開口面と底面との間の凹部内に、凹部底面の幅よりも
狭い部分が少なくとも１ケ所存在することを相称する。The term "undercut" in the present invention refers to the presence of at least one portion in the recess between the opening surface and the bottom surface that is narrower than the width of the bottom surface of the recess.
（作用）
本発明によれば、予め成形された一次成形体の凹部の周
辺部に外力等を加えることによって凹部壁面部を凹部内
に突出せしめて凹部にアンダーカット部を形成して二次
成形体の抜は止め部を設け、次いで前記凹部に二次成形
体を形成する第２の樹脂を射出充填するため、得られる
複合射出成形体の二次成形体は一次成形体の凹部に強固
に固定されるのである。(Function) According to the present invention, by applying an external force or the like to the periphery of the recess of the pre-formed primary molded body, the wall surface of the recess is made to protrude into the recess, thereby forming an undercut portion in the recess, and forming the secondary molded body. A stopper part is provided for removing the body, and then the second resin for forming the secondary molded body is injected and filled into the recessed part, so that the secondary molded part of the resulting composite injection molded product is firmly attached to the recessed part of the primary molded body. It is fixed.
また、一次成形体の凹部のアンダーカット部は、一次成
形体を収容する金型と一次成形体の凹部周辺部を押圧す
る押圧部を有する金型とを型締めすることによって容易
に形成することができる。Further, the undercut portion in the recess of the primary molded product can be easily formed by clamping a mold that accommodates the primary molded product and a mold that has a pressing portion that presses the peripheral portion of the recess of the primary molded product. Can be done.
（実施例） 本発明を図面を用いて説明する。(Example) The present invention will be explained using the drawings.
第１図（ａ）は、本発明の複合射出成形体の一例を示す
斜視図、第１図（ｂ）は第１図に示す複合射出成形体の
Ｘ−Ｘ面における断面図を各々示す。FIG. 1(a) is a perspective view showing an example of the composite injection molded article of the present invention, and FIG. 1(b) is a sectional view of the composite injection molded article shown in FIG. 1 taken along the line X-X.
第１図において、ガラス繊維含有のナイロン６から成る
第１の樹脂によって形成されている一次成形体Ａのフラ
ンジ部に、シリコンゴムから成る第２の樹脂によって形
成されているシールリングである二次成形体Ｂと複数個
のボルト穴１０とが設けられている。In FIG. 1, a secondary molded body A, which is a seal ring made of a second resin made of silicone rubber, is attached to a flange portion of a primary molded body A made of a first resin made of nylon 6 containing glass fiber. A molded body B and a plurality of bolt holes 10 are provided.
かかる一次成形体Ａの二次成形体Ｂとの接触面には凹部
３が形成されており、凹部３を形成する側壁は上方はど
凹部３内に突出している。A recess 3 is formed in the contact surface of the primary molded body A with the secondary molded body B, and a side wall forming the recess 3 projects upward into the recess 3.
このため、凹部３の断面形状は、第１図（ｂ）に示す様
に、凹部３の開口部近傍４が最狭で且つ開口部近傍４か
ら凹部３の底部に接近するほど広くなる、いわゆる逆テ
ーパ型であって、底部近傍５がアンダーカット部となる
。Therefore, the cross-sectional shape of the recess 3 is narrowest near the opening 4 of the recess 3 and becomes wider as it approaches the bottom of the recess 3 from the vicinity 4 of the opening, as shown in FIG. 1(b). It is of a reverse tapered type, and the vicinity of the bottom 5 becomes an undercut portion.
この様な凹部３には、シリコンゴムから成る第２の樹脂
が充填されており、凹部３に充填された第２の樹脂は二
次成形体Ｂの一部を構成する。Such a recess 3 is filled with a second resin made of silicone rubber, and the second resin filled in the recess 3 constitutes a part of the secondary molded body B.
従って、二次成形体Ｂの一部は、底部近傍５にアンダー
カット部が形成されている一次成形体１の凹部３に嵌合
されており、凹部３の開口部近傍４の突出部が二次成形
体Ｂの抜は止め部となるため、二次成形体Ｂは一次成形
体Ａの凹部３に強固に固着されているのである。Therefore, a part of the secondary formed body B is fitted into the recess 3 of the primary formed body 1 in which an undercut portion 5 is formed near the bottom, and the protrusion near the opening 4 of the recess 3 is The secondary molded body B is firmly fixed to the recess 3 of the primary molded body A because it serves as a stop for removing the secondary molded body B.
かかる第１図に示す複合射出成形体は、第２図に示す射
出成形方法によって得ることができる。The composite injection molded article shown in FIG. 1 can be obtained by the injection molding method shown in FIG.
即ち、先ず凹部１３が形成されている一次成形体Ａを、
一次成形体Ａが成形される一対の金型の一方である金型
Ｚに残留させる〔第２図（ａ）〕。That is, first, the primary molded body A in which the recessed part 13 is formed is
The primary molded body A is left in the mold Z, which is one of a pair of molds in which the primary molded body A is molded [FIG. 2(a)].
かかる金型Ｚに残留された一次成形体Ａの凹部１３は、
一次成形体Ａの上面に開口されている。The recess 13 of the primary molded body A remaining in the mold Z is
It is opened on the upper surface of the primary molded body A.
この様な凹部１３の断面形状は、第２図（ａ）に示す様
に、凹部１３の側壁が底面に対して略垂直である長方形
状であるため、金型Ｚと対になって一次成形体Ａを形成
する他方の金型は、型開の際に一次成形体Ａから容易に
離型することができ、一次成形体Ａを金型Ｚに残留させ
ることができる。The cross-sectional shape of the recess 13 is rectangular, with the side wall of the recess 13 being approximately perpendicular to the bottom surface, as shown in FIG. The other mold forming the body A can be easily released from the primary molded object A when the mold is opened, and the primary molded object A can remain in the mold Z.
次いで、突起部６と二次成形体用キャビティ７とが具備
されている金型Ｙと一次成形体Ａが残留されている金型
Ｚとを型締することによって、一次成形体Ａの凹部１３
の開口部周辺部を押圧する〔第２図（ａ）、（ｂ）〕。Next, by clamping the mold Y in which the protrusion 6 and the cavity 7 for the secondary molded object and the mold Z in which the primary molded object A remains, the recess 13 of the primary molded object A is closed.
Press the area around the opening [Fig. 2 (a), (b)].
かかる凹部１３の周辺部の押圧によって、凹部１３の両
側壁面が凹部１３内に突出する。この突出の程度は、第
２図（ｂ）の斜線部８に示す様に、凹部上方はど大であ
るため、凹部の断面形状は逆テーパ状に変形する。この
様に断面形状が変形した凹部３には、底部近傍５にアン
ダーカット部が形成され、開口部近傍４には抜は止め部
が形成される。By pressing the peripheral portion of the recess 13, both side wall surfaces of the recess 13 protrude into the recess 13. The extent of this protrusion is large in the upper part of the recess, as shown by the shaded area 8 in FIG. 2(b), so that the cross-sectional shape of the recess is deformed into an inversely tapered shape. In the recessed portion 3 whose cross-sectional shape has been deformed in this manner, an undercut portion is formed near the bottom portion 5, and a pull-out stop portion is formed near the opening portion 4.
更に、かかる凹部３及び金型Ｙのキャビティ７に第２の
樹脂を射出充填してから金型Ｙと金型Ｚとを型開するこ
とによって、二次成形体Ｂが一次成形体Ａの凹部３に強
固に固着されている複合成形体を得ることができる〔第
２図（ｂ）、（Ｃ）〕。Furthermore, by injecting and filling the second resin into the recess 3 and the cavity 7 of the mold Y, and then opening the mold Y and the mold Z, the secondary molded product B is formed into the recess of the primary molded product A. It is possible to obtain a composite molded body that is firmly fixed to 3 [FIGS. 2(b) and 2(C)].
本本実例の様に、二次成形体Ｂを形成する第２の樹脂と
して、シリコンゴムの如く、表面張力が極め°Ｃ低い樹
脂を用いる場合には、第２の樹脂は５μ程度の極めて狭
い間隙にも進入するため、二次成形体Ｂの周辺にパリが
発生し易いという欠点を有している。As in this example, when a resin with extremely low surface tension, such as silicone rubber, is used as the second resin for forming the secondary molded body B, the second resin has an extremely narrow gap of about 5μ. Since it also penetrates into the secondary molded body B, it has the disadvantage that it is likely to generate flakes around the secondary molded body B.
この点、本実施例においては、一次成形体Ａの凹部３の
開口部全周に亘って、その周辺部を金型Ｙの突起部６で
押圧しつつ凹部３及びキャビティ７に第２の樹脂を射出
充填することによって、凹部３の全周辺部のシール性が
格段に向上するため、二次成形体Ｂの周辺部に発生する
パリを防止することができる。In this regard, in this embodiment, the second resin is applied to the recess 3 and the cavity 7 while pressing the peripheral part with the protrusion 6 of the mold Y over the entire circumference of the opening of the recess 3 of the primary molded body A. By injection-filling, the sealing performance of the entire periphery of the recess 3 is significantly improved, so that it is possible to prevent the formation of flakes in the periphery of the secondary molded body B.
金型Ｚに残留されている一次成形体Ａに形成されている
凹部１３の周辺部を押圧してアンダーカットを設ける方
法としては、第２図に示す金型Ｙに設けられている突起
部６で凹部１３の周辺部を押圧する方法の他に、第３図
に示す方法によっても凹部１３にアンダーカット部を形
成することができる。As a method of forming an undercut by pressing the periphery of the recess 13 formed in the primary molded body A remaining in the mold Z, the protrusion 6 provided in the mold Y shown in FIG. In addition to the method of pressing the periphery of the recess 13, an undercut portion can also be formed in the recess 13 by the method shown in FIG.
第３図に示す方法は、予め一次成形体Ａの凹部１３の開
口部周辺部に凸部９を設けておき〔第３図（ａ））、前
記凹部９を二次成形体用キャビティが設けられている金
型Ｙの下面で押圧する方法である（第３図（ａ）、（ｂ
）〕。In the method shown in FIG. 3, a convex portion 9 is provided in advance around the opening of the concave portion 13 of the primary molded body A [FIG. 3(a)), and a cavity for the secondary molded body is provided in the concave portion 9. This is a method of pressing with the lower surface of the mold Y (Fig. 3 (a), (b)
)].
この方法によれば、一次成形体Ａの上面に残留する押圧
爪が、第２図に示す金型Ｙの突起部６で押圧する場合に
比較して小さくすることができる〔第３図（ｂ）、（Ｃ
））。According to this method, the pressing claws remaining on the upper surface of the primary molded body A can be made smaller compared to the case of pressing with the protrusion 6 of the mold Y shown in FIG. ), (C
)).
かかる第２図及び第３図に示す方法を併用してもよく、
その例を第４図及び第５図に示す。The methods shown in FIGS. 2 and 3 may be used in combination,
Examples are shown in FIGS. 4 and 5.
第４図は、一次成形体Ａの凹部１３の開口部周辺部を、
予め凹部１３の開口部周辺部に形成されている凸部９と
金型Ｙに設けられている突起部６とによって、二重に押
圧する方法である。FIG. 4 shows the opening periphery of the recess 13 of the primary molded body A.
This is a double pressing method using a protrusion 9 formed in advance around the opening of the recess 13 and a protrusion 6 provided on the mold Y.
また、第５図は、凹部１３の開口部周辺部の各側を、予
め凹部１３の開口部周辺部に形成されている凸部９又は
金型Ｙの突起部６によって押圧する方法である。Further, FIG. 5 shows a method in which each side of the periphery of the opening of the recess 13 is pressed by the protrusion 9 of the mold Y or the protrusion 6 formed in advance around the opening of the recess 13.
かかる押圧方法において、第５図に示す方法が凹部１３
の壁面の凹部内への突出する程度を最も大とすることが
できる。Among such pressing methods, the method shown in FIG.
The degree of protrusion of the wall surface into the recess can be maximized.
尚、本実施例においては、凹部１３の断面形状を略長方
形状としたが、金型Ｚと対になって−次成形体Ａを形成
する金型が型開の際に、一次成形体Ａから容易に離型で
きる限り、凹部１３の断面形状を抜きテーパ状、半円、
四角形、半楕円状等任意の形状としてもよい。In the present embodiment, the cross-sectional shape of the recess 13 is approximately rectangular, but when the mold for forming the next molded object A is paired with the mold Z, when the mold is opened, the primary molded object A As long as it can be easily released from the mold, the cross-sectional shape of the recess 13 may be tapered, semicircular, or
It may be of any shape such as a rectangle or a semi-ellipse.
また、金型Ｙに設ける突起部６の断面形状は、型彫、半
円形、半楕円形、台形等のものであってもよく、特に喫
形とすることが一次成形体Ａの凹部１３の周辺部に突起
部６が食い込み凹部壁面を容易に突出せしめることがで
きるため好ましい。Further, the cross-sectional shape of the protrusion 6 provided on the mold Y may be a carved shape, a semicircle, a semiellipse, a trapezoid, etc., and it is particularly preferable that the protrusion 6 has a cut shape. This is preferable because the protrusion 6 bites into the peripheral portion and allows the wall surface of the recess to protrude easily.
更に、予め一次成形体Ａの凹部１３の周辺部に形成する
凸部９の断面形状も、同様に、型彫、半円形、半楕円形
、台形等任意の形状とすることができる。Furthermore, the cross-sectional shape of the convex part 9 formed in advance around the concave part 13 of the primary molded body A can be similarly arbitrary, such as die-carved, semicircular, semielliptical, trapezoidal, etc.
これら突起部６及び／又は凸部９は、一次成形体Ａの凹
部１３の開口部全周に亘って、その周辺部を押圧する様
に設けてもよく、凹部１３の周辺部の少なくとも一部を
押圧する様に設けてもよい。These protrusions 6 and/or protrusions 9 may be provided over the entire circumference of the opening of the recess 13 of the primary molded body A so as to press the periphery thereof, or at least part of the periphery of the recess 13. It may be provided so as to press.
要は一次成形体Ａの凹部の周辺部を押圧して凹部壁面を
突出させるものであればよい。In short, any material that presses the periphery of the recess of the primary molded body A and causes the wall surface of the recess to protrude may be used.
この様に、一次成形体Ａの凹部１３の周辺部を押圧して
アンダーカット部を有する凹部３に変形させるためには
、金型Ｙが金型Ｚに残留付着している一次成形体Ａの面
とその凹部を除き密着するものであることが、金型Ｙと
金型Ｚとを型締する際に、容易に凹部壁面を突出せしめ
ることができる。In this way, in order to press the periphery of the recess 13 of the primary molded object A to transform it into the recess 3 having an undercut, the mold Y must press the peripheral part of the recess 13 of the primary molded object A that remains attached to the mold Z. When the mold Y and the mold Z are clamped together, the wall surface of the recess can easily be made to protrude by being in close contact with each other except for the surface and the recess thereof.
かかる金型Ｙには、第６図に示す如く、一次成形体Ａの
凹部及びキャビティ内に二次成形体Ｂを形成する第２の
樹脂を射出充填する射出孔１１が設けられていてもよい
。As shown in FIG. 6, the mold Y may be provided with an injection hole 11 for injecting and filling the second resin forming the secondary molded body B into the recess and cavity of the primary molded body A. .
尚、この様な射出孔１１は金型Ｙとは別個の金型に設け
られていてもよい。Incidentally, such an injection hole 11 may be provided in a mold separate from the mold Y.
第６図は、本実施例の複合射出成形体を成形することが
できる、複合射出成形装置を示す。FIG. 6 shows a composite injection molding apparatus capable of molding the composite injection molded article of this example.
第６図に示す射出成形装置は、機台３０上に一次成形用
射出装置２０と二次成形用射出装置２１とが併設されて
おり、可動盤２４と固定盤２２との間に金型ｗ、ｙ、ｚ
が設けられている。In the injection molding apparatus shown in FIG. 6, an injection device 20 for primary molding and an injection device 21 for secondary molding are installed on a machine stand 30, and a mold w is placed between a movable platen 24 and a fixed platen 22. ,y,z
is provided.
金型Ｚは型締シリンダ２７に直結する型締ピストン２６
によって移動可能である可動盤２４にボルト止めされて
おり、金型Ｚはスライド板にボルト止めされている金型
Ｗ又は金型Ｙと連結・型締され、或いは型開される。The mold Z has a mold clamping piston 26 directly connected to a mold clamping cylinder 27.
The mold Z is bolted to a movable platen 24 which is movable by a sliding plate, and the mold Z is connected to and clamped with the mold W or the mold Y bolted to the slide plate, or the mold is opened.
また、スライド板２５は固定盤２２上に設けられている
油圧シリンダ２３によってスライドし、金型Ｗ又は金型
Ｙが金型Ｚと連結・型締することができる位置にスライ
ドされる。Further, the slide plate 25 is slid by a hydraulic cylinder 23 provided on the fixed platen 22 to a position where the mold W or the mold Y can be connected to the mold Z and clamped.
第６図に示す射出成形装置において、第６図（ａ）に示
す様に、型締シリンダ２７及び型締ピストン２６によっ
て可動盤２４が右方に移動して金型Ｚと金型Ｗとが型締
された後、−吹成形用射出装置３０が前進して金型Ｚと
金型Ｗとで形成される一次成形用キャビティにガラス繊
維含有の溶融ナイロン６が射出充填される。In the injection molding apparatus shown in FIG. 6, as shown in FIG. 6(a), the movable platen 24 is moved to the right by the mold clamping cylinder 27 and the mold clamping piston 26, and the mold Z and the mold W are separated. After the mold is clamped, the injection device 30 for blow molding moves forward, and molten nylon 6 containing glass fiber is injected and filled into the primary molding cavity formed by the mold Z and the mold W.
かかるガラス繊維含有の溶融ナイロン６は、−吹成形用
射出装置２０上に設けられているホッパー２９から供給
される固形のペレット状ナイロン６樹脂（ガラス繊維含
有）が−吹成形用射出装置２０内でｔ容融されたもので
ある。Such glass fiber-containing molten nylon 6 is produced by: - a solid pellet-like nylon 6 resin (glass fiber-containing) supplied from a hopper 29 provided on the blow molding injection device 20; It was melted at t.
射出充填されたナイロン６が冷却・固化し、吹成形用射
出装置２０が後退した後、可動盤２４が左方に移動して
金型Ｚと金型Ｗとが型開きされる。この際に、一次成形
体Ａは、凹部１３が一次成形体Ａの上面に開口しつつ金
型Ｚに残留する。After the injected and filled nylon 6 cools and solidifies, and the blow molding injection device 20 retreats, the movable platen 24 moves to the left and the molds Z and W are opened. At this time, the primary molded body A remains in the mold Z with the recess 13 opening on the upper surface of the primary molded body A.
次いで、金型Ｚに残留する一次成形体Ａは、第６図（ｂ
）に示す様に、スライド板２５のスライドによって移動
された金型Ｙと連結・型締される。Next, the primary molded body A remaining in the mold Z is shown in FIG.
), the mold Y moved by the slide of the slide plate 25 is connected and clamped.
金型Ｙは、第６図（ａ）に示す如く、二次成形体用キャ
ビティ７の周辺部に突起部６が設けられており、シリコ
ンゴムから成る第２の樹脂の射出孔１１が前記キャビテ
ィ７に連結されている。As shown in FIG. 6(a), the mold Y is provided with a protrusion 6 around a cavity 7 for a secondary molded body, and an injection hole 11 for a second resin made of silicone rubber is inserted into the cavity. It is connected to 7.
更に、金型Ｙの中央部近傍に凹部４０が設けられており
、かかる凹部４０は、第６図（ｂ）に示す様に、一次成
形体Ａに形成されるスプル３３を、金型２と金型Ｙとの
型締の際に、収納するものである。Further, a recess 40 is provided near the center of the mold Y, and the recess 40 allows the sprue 33 formed in the primary molded body A to be connected to the mold 2 as shown in FIG. 6(b). It is to be stored when the mold Y is clamped.
尚、スプル３３は、一次成形体Ａを形成する際に、−吹
成形用射出装置２０のノズル先端から一次成形体用キャ
ビティ間に設けられている溶融樹脂通路１３３に充填さ
れた第１の樹脂が冷却・固化したものである。Incidentally, when forming the primary molded body A, the sprue 33 is used to supply the first resin filled into the molten resin passage 133 provided between the nozzle tip of the injection device 20 for blow molding and the cavity for the primary molded body. is cooled and solidified.
金型Ｚと金型Ｙとの型締の際に、金型Ｙに設けられてい
る突起部６が一次成形体Ａの凹部１３の開口部周辺部を
押圧し、凹部１３を逆テーパー状の凹部３に変形させる
。When the mold Z and the mold Y are clamped, the protrusion 6 provided on the mold Y presses the opening periphery of the recess 13 of the primary molded body A, and the recess 13 is shaped into a reverse tapered shape. It is transformed into a concave portion 3.
かかる凹部３及びキャビティ７に、二次成形用射出装置
２１が前進してシリコンゴムから成る第２の樹脂を注入
し二次成形体Ｂを成形する。The injection device 21 for secondary molding advances into the recess 3 and cavity 7 to inject a second resin made of silicone rubber to mold the secondary molded body B.
第２の樹脂は、シール材供給装置２８のボット３１から
シリコンゴムを、ポット３２から硬化剤等を各々の二次
成形用射出装置２１に供給し、二次成形用射出装置２１
内で両者を混合してから凹部３及びキャビティ７に射出
充填される。射出充填された第２の樹脂は凹部３及びキ
ャビティ７内で硬化する。The second resin is supplied to each secondary molding injection device 21 by supplying silicone rubber from the bot 31 of the sealing material supply device 28 and curing agent etc. from the pot 32 to each secondary molding injection device 21.
After mixing the two inside, the recess 3 and cavity 7 are injected and filled. The injected and filled second resin hardens within the recess 3 and cavity 7.
かかる第２の樹脂は熱硬化性樹脂であるため、二次成形
用射出装置２１を冷却し、金型Ｙを１２０〜１５０°Ｃ
程度に加熱しておくことが、第２の樹脂を二次成形用射
出装置２１内で硬化させることな（凹部３及びキャビテ
ィ７内で迅速に硬化させることかできる。Since the second resin is a thermosetting resin, the secondary molding injection device 21 is cooled and the mold Y is heated to 120 to 150°C.
By heating the second resin to a certain degree, the second resin can be cured quickly in the recess 3 and the cavity 7 without being cured in the injection device 21 for secondary molding.
また、金型Ｙの前記温度の範囲では、第１の樹脂として
使用する熱可塑性樹脂であるナイロン６に対しては特に
影響を与えることがない。Furthermore, within the above temperature range of the mold Y, there is no particular influence on nylon 6, which is a thermoplastic resin used as the first resin.
一方、一次成形体Ａを形成する金型Ｗは、熱可塑性樹脂
である第１の樹脂を迅速に冷却・固化させるため、８０
〜９０°Ｃ程度に維持しておくことが好ましい。On the other hand, the mold W for forming the primary molded body A has an 80%
It is preferable to maintain the temperature at about ~90°C.
第６図の装置では、一次成形体Ａに形成される凹部１３
の開口部周辺部の抑圧が金型Ｙの突起部６でなされてい
るが、一次成形体Ａの凹部１３の開口部周辺部に予め形
成される凸部９の押圧による例を第７図に示す。In the apparatus shown in FIG. 6, the recess 13 formed in the primary molded body A is
The area around the opening is suppressed by the protrusion 6 of the mold Y, and FIG. show.
尚、第７図に示す装置は、第６図に示す装置と同様に、
型締・型開時に金型Ｚ及びノズル１２０．１２１が横方
向に移動する横型装置であり、図面上での上下方向の移
動は実際には横方向への移動である。Note that the device shown in FIG. 7 is similar to the device shown in FIG.
This is a horizontal device in which the mold Z and nozzles 120 and 121 move laterally during mold clamping and mold opening, and the vertical movement in the drawings is actually horizontal movement.
第７図（ａ）に示す様に、金型Ｚと金型Ｗとによって形
成される一次成形体用キャビティに一次成形用射出装置
２０のノズル１２０から溶融されている第１の樹脂が射
出され、一次成形体Ａの凹部１３の開口部周辺部には凸
部９が形成される。As shown in FIG. 7(a), the molten first resin is injected from the nozzle 120 of the injection device 20 for primary molding into the cavity for the primary molded body formed by the mold Z and the mold W. A convex portion 9 is formed around the opening of the concave portion 13 of the primary molded body A.
次いで、金型Ｗと金型Ｚとが型開された後、凸部９が形
成されている一次成形体Ａが残留する金型Ｚと、スライ
ド板２５の移動によって移動した金型Ｙとが型締される
ことによって、一次成形体Ａの凸部９は金型Ｙの下面で
押圧され、凹部１３の断面形状が逆テーバ状に変形して
アンダーカット部を有する凹部３が形成される。更にか
かる凹部３及び二次成形体用キャビティに、第２の樹脂
を射出充填し、二次成形体Ｂを形成する。Next, after the mold W and the mold Z are opened, the mold Z in which the primary molded body A in which the convex portion 9 is formed remains, and the mold Y that has been moved by the movement of the slide plate 25 are separated. By being clamped, the convex portion 9 of the primary molded body A is pressed by the lower surface of the mold Y, and the cross-sectional shape of the concave portion 13 is deformed into an inverted tapered shape, thereby forming the concave portion 3 having an undercut portion. Further, a second resin is injected and filled into the recess 3 and the cavity for the secondary molded body to form the secondary molded body B.
かかる第２の樹脂は、二次成形用射出機２１のノズル１
２１から射出孔１１を介して射出充填される〔第７図（
ｂ）］。This second resin is supplied to the nozzle 1 of the injection machine 21 for secondary molding.
21 through the injection hole 11 [Fig. 7 (
b)].
金型Ｙには、第７［Ｄ （ｂ）に示す如く、一次成形体
Ａに形成されるスプル３３を収納する凹部４０が設けら
れており、金型Ｚと金型Ｙとの型締をする際に、スプル
３３を切断することなく行うことができる。The mold Y is provided with a recess 40 for accommodating the sprue 33 formed in the primary molded body A, as shown in No. 7 [D (b), and is used to clamp the molds Z and Y. This can be done without cutting the sprue 33.
また、第６図に示す装置においは、金型Ｗ及び金型Ｙが
個々にスライド板２５にボルト止めされているものであ
るが、第８図に示す如く、金型Ｗと金型Ｙとを一体構造
としたスライド板２５にボルト止めしてもよい。Furthermore, in the apparatus shown in FIG. 6, the mold W and the mold Y are individually bolted to the slide plate 25, but as shown in FIG. It may be bolted to a slide plate 25 having an integral structure.
尚、かかるスライド板２５をロータリタイプのものに代
えてもよく、ロータリータイプのものでは金型Ｘ、Ｙが
回転しつつ金型Ｚと連結・型締する位置に移動する。Incidentally, the slide plate 25 may be replaced with a rotary type, in which the molds X and Y rotate and move to a position where they are connected to and clamped with the mold Z.
これまで説明してきた実施例は、一次成形体Ａの凹部１
３の両側部上面を押圧し、凹部１３の断面形状を変形さ
せるものであったが、凹部１３の両側部又はその一方が
肉薄であるため、両側部の上面を押圧することによって
凹部１３の断面形状を変形させることができないものの
例を説明する。In the embodiments described so far, the concave portion 1 of the primary molded body A
However, since one or both sides of the recess 13 are thin, pressing the upper surfaces of both sides changes the cross-sectional shape of the recess 13. An example of something whose shape cannot be changed will be explained.
第９図、第１０図は、一次成形体Ａの凹部１３を形成す
る側部の一方（第９図の５０）が肉薄であって、その上
面を押圧することができない場合である。FIGS. 9 and 10 show the case where one of the side parts (50 in FIG. 9) forming the recess 13 of the primary molded body A is so thin that the upper surface cannot be pressed.
この場合には、押圧することができる側部５１の上面の
みを押圧することによっても、凹部３１にアンダーカッ
ト部を設けることができる。In this case, the undercut portion can also be provided in the recess 31 by pressing only the upper surface of the side portion 51 that can be pressed.
或いは、第１０図に示す如く、上面を押圧することがで
きない側部５０に接する金型７０５２面を傾斜させ、か
かる５２面で側部５０を凹部１３内に押圧しつつ他方の
側部５１の上面を金型Ｙの突起部６で押圧することによ
っても、凹部１３を逆テーパ状に変形させることができ
る。Alternatively, as shown in FIG. 10, the surface of the mold 7052 that contacts the side portion 50 whose upper surface cannot be pressed is tilted, and while pressing the side portion 50 into the recess 13 with the surface 52, the other side portion 51 is pressed. The recess 13 can also be deformed into a reverse tapered shape by pressing the upper surface with the protrusion 6 of the mold Y.
かかる第９図に示す方法は、第１１図に示す様に、底部
にシール部材２２０が設けられているキャップ１００を
射出成形によって成形せんとする際に用いることができ
る。The method shown in FIG. 9 can be used when molding a cap 100 having a sealing member 220 at the bottom by injection molding, as shown in FIG. 11.
即ち、一次成形体の凹部１３を形成する側部５０．５１
は共に肉薄であって、その上面を押圧することは不可能
であるため、他方の側部１１０の上面を押圧することに
よって、凹部Ｉ３の壁面の一方を変形させアンダーカッ
ト部を有する凹部３を形成することができる。That is, the side portions 50, 51 forming the recess 13 of the primary molded body
Both are thin and it is impossible to press the top surface of the side portion 110. Therefore, by pressing the top surface of the other side portion 110, one of the wall surfaces of the recess I3 is deformed and the recess 3 having an undercut portion is formed. can be formed.
更に、第１０図に示す方法は、第１２図に示す様に、肉
薄の側部５０．５１の上方を、金型Ｙの曲面５２によっ
て共に凹部１３内に押圧し、アンダーカット部を有する
凹部３とすることができる。Furthermore, in the method shown in FIG. 10, as shown in FIG. 12, the upper portions of the thin side portions 50 and 51 are both pressed into the recess 13 by the curved surface 52 of the mold Y, thereby creating a recess having an undercut portion. 3.
また、第１３図及び第１４図は、二重管において、外管
と内管との間に二次成形体Ｂを射出成形せんとする場合
である。Moreover, FIG. 13 and FIG. 14 show the case where a secondary molded body B is injection molded between the outer tube and the inner tube in a double tube.
この場合において、第１３図の様に、内管の一部を変形
することができるときには、金型Ｙの棒状突出部５５の
底部近傍５６をテーパ状とし、かかるテーパ状の底部近
傍５６によって、内管の一部を凹部１３内に変形させ、
アンダーカット部を有する凹部３とする。In this case, as shown in FIG. 13, when a part of the inner tube can be deformed, the bottom portion 56 of the rod-shaped protrusion 55 of the mold Y is tapered, and the tapered bottom portion 56 allows Deforming a part of the inner tube into the recess 13,
The recessed portion 3 has an undercut portion.
他方、第１４図の如く、内管を変形することができない
ときには、金型Ｙに設けられているピン５７を突出させ
、外管の一部を変形させて凹部３にアンダーカット部を
設けることができる。On the other hand, as shown in FIG. 14, when the inner tube cannot be deformed, a pin 57 provided on the mold Y can be protruded to deform a part of the outer tube to provide an undercut in the recess 3. Can be done.
この様な第１３図及び第１４図に示す方法を、第１５図
に示す様に、併用することができる。第１５図に示す方
法によれば、更に一層確実にアンダーカット部を凹部３
に設けることができ、且つ二次成形体を射出充填する際
に、パリの発生を防止することができる。The methods shown in FIGS. 13 and 14 can be used together as shown in FIG. 15. According to the method shown in FIG.
It is also possible to prevent the occurrence of flakes when injection filling the secondary molded product.
尚、凹部１３の両側部又は一方を押圧する場合において
、凹部全周に亘って押圧してもよく、或いはその一部で
あってもよい。In addition, when pressing both sides or one side of the recessed portion 13, the pressing may be performed over the entire circumference of the recessed portion, or a portion thereof may be pressed.
更に、第１６図には、一次成形体Ａの凹部が大溝部１３
０と小溝部１３との二段溝となっており、小満部１３の
開口部周辺部のみを押圧してアンダーカット部を有する
凹部３としてから大溝部１３０及び凹部３に二次成形体
を形成する樹脂を射出充填せんとする場合を示す。Furthermore, in FIG. 16, the recessed portion of the primary molded body A
0 and a small groove part 13, and only the peripheral part of the opening of the small full part 13 is pressed to form a recess part 3 having an undercut part, and then a secondary molded body is formed in the large groove part 130 and the recess part 3. This shows the case where the resin is injected and filled.
この場合には、第６図において、金型Ｙに設けられてい
る射出孔１１を金型Ｙとは別個の金型Ｙ。In this case, in FIG. 6, the injection hole 11 provided in the mold Y is a separate mold Y from the mold Y.
（図示せず）に設けること、つまり金型Ｗ、Ｙ、Ｚに加
えて射出孔１１が設けられている金型Ｙ。(not shown), that is, a mold Y in which an injection hole 11 is provided in addition to the molds W, Y, and Z.
を設けることによって達成できる。This can be achieved by providing
即ち、金型Ｗ、先ずＺで第１６図（ａ）に示す二段溝の
凹部が設けられている一次成形体Ａを成形する。That is, first, using the mold W and the mold Z, a primary molded body A having a two-stage groove recess shown in FIG. 16(a) is molded.
次いで、第１６図（ｂ）に示す如く、金型Ｚに付着残留
している一次成形体Ａの小満部１３の周辺部を金型Ｙに
設けられている突起部６で押圧して小満部１３の壁面部
のみを凹部内に突出させアンダーカット部を形成する。Next, as shown in FIG. 16(b), the periphery of the small full part 13 of the primary molded body A remaining attached to the mold Z is pressed with the protrusion 6 provided on the mold Y to form the small full part. Only the wall surface portion 13 projects into the recess to form an undercut portion.
その後、金型Ｙ１と金型Ｚとが対になって金型Ｙ′に設
けられている射出孔１１から二次成形体Ｂを形成する第
２の樹脂を、第１６図（ｂ）の様に、凹部及びキャビテ
ィ内に射出充填することによって、一次成形体Ａと二次
成形体Ｂとを一体化せしめることができる。Thereafter, the mold Y1 and the mold Z are paired together to inject the second resin to form the secondary molded body B from the injection hole 11 provided in the mold Y' as shown in FIG. 16(b). By injecting and filling the recesses and cavities, the primary molded body A and the secondary molded body B can be integrated.
以上、説明した本実施例においては、一次成形体Ａを形
成する第１の樹脂として熱可塑性樹脂であるナイロン６
を、二次成形体Ｂを形成する第２の樹脂として熱硬化性
樹脂であるシリコンゴムを各々用いたが、本発明におい
ては更に多くの樹脂を用いることができる。In this embodiment described above, the first resin forming the primary molded body A is nylon 6, which is a thermoplastic resin.
Although silicone rubber, which is a thermosetting resin, was used as the second resin for forming the secondary molded body B, in the present invention, more resins can be used.
例えば、熱可塑性樹脂としては、ポリエステル、ポリ塩
化ビニル、ポリエチレン、ポリプロピレン等の汎用樹脂
を用いることができ、熱硬化性樹脂としてはエポキシ樹
脂、不飽和ポリエステル等を用いることができる。For example, general-purpose resins such as polyester, polyvinyl chloride, polyethylene, and polypropylene can be used as the thermoplastic resin, and epoxy resins, unsaturated polyesters, etc. can be used as the thermosetting resin.
また、前記熱可塑性樹脂と熱硬化性樹脂との組み合わせ
に限らず、熱可塑性樹脂においても、ポリエステルとポ
リプロピレンとの様に、互いに非相溶性の樹脂を用いて
複合成形体を射出成形せんとする際にも本発明を通用す
ることができる。Furthermore, in addition to the combination of thermoplastic resins and thermosetting resins, thermoplastic resins may also be injection molded using resins that are incompatible with each other, such as polyester and polypropylene. The present invention can also be applied to this case.
かかる本発明によれば、第１７図に示す様に、複雑な形
状の一次成形体Ａに、二次成形体Ｂである弾性重合体か
ら成るシール部材が強固に固着されている複合成形体を
、射出成形によって容易に得ることができる。According to the present invention, as shown in FIG. 17, a composite molded body in which a sealing member made of an elastic polymer, which is a secondary molded body B, is firmly fixed to a primary molded body A with a complicated shape. , can be easily obtained by injection molding.
第１７図に示す二次成形体Ｂはシール部材として使用し
たが、その弾性を利用してクツション部材としても使用
することができ、更に防滑部材としても使用することが
できる。Although the secondary molded body B shown in FIG. 17 was used as a seal member, it can also be used as a cushion member by utilizing its elasticity, and can also be used as an anti-slip member.
その際に、各部材に最適な重合体を適宜選択することが
できることは勿論のことである。At that time, it goes without saying that the most suitable polymer for each member can be selected as appropriate.
尚、本実施例においては、可動盤２４等が左右方向に移
動する横型射出成形機を用いたが、可動盤２４等が上下
方向に移動する縦型射出成形機にも本発明を適用するこ
とができる。In this embodiment, a horizontal injection molding machine in which the movable platen 24 etc. move in the horizontal direction is used, but the present invention can also be applied to a vertical injection molding machine in which the movable platen 24 etc. move in the vertical direction. Can be done.
（発明の効果）
本発明によれば、複雑な形状を呈する一次成形体に、二
次成形体であるシール部材、クツション部材、或いは防
滑部材等が強固に固着されている複合成形体を、パリの
３生を抑制しつつ射出成形によって容易に得ることがで
きる。(Effects of the Invention) According to the present invention, a composite molded body in which a secondary molded body such as a sealing member, a cushioning member, or an anti-slip member is firmly fixed to a primary molded body exhibiting a complicated shape, is 3. It can be easily obtained by injection molding while suppressing the production.
このため、シール部材等を一次成形体に人手で組付ける
こと或いは発生するパリを取り除く等の工数を著しく減
少させることができ、成形の工程を極めて簡略化するこ
とができる。Therefore, the number of man-hours required for manually assembling the sealing member and the like to the primary molded body or removing generated flakes can be significantly reduced, and the molding process can be extremely simplified.
第１図は本発明の複合射出成形体の一実施例を示す斜視
図及び断面図、第２〜第４図は本発明の複合射出成形方
法を説明する説明図、第６〜８図は本発明の複合射出成
形装置を説明する説明図、第９〜第１６図は本発明の他
の実施例を示す説明図、第１７図は本発明の複合射出成
形体の他の実施例を示す斜視図を各々示す。
図において、
Ａ・・・一次成形体、 Ｂ・・・二次成形体、３・・・
アンダーカット部を有する凹部、５・・・アンダーカッ
ト部が形成されている凹部３の底部近傍、
Ｗ・・・一次成形体Ａ用の金型、
Ｙ・・・金型Ｚに付着残留する一次成形体Ａの凹部の周
辺部を押圧する金型、
Ｚ・・・一次成形体Ａが付着残留する側の金型。
第Fig. 1 is a perspective view and a sectional view showing an embodiment of the composite injection molded article of the present invention, Figs. 2 to 4 are explanatory diagrams explaining the composite injection molding method of the present invention, and Figs. An explanatory diagram illustrating the composite injection molding apparatus of the invention, FIGS. 9 to 16 are explanatory diagrams showing other embodiments of the invention, and FIG. 17 is a perspective view showing another embodiment of the composite injection molded article of the invention. Figures are shown respectively. In the figure, A...primary molded body, B...secondary molded body, 3...
Recessed portion having an undercut portion, 5: Near the bottom of the recessed portion 3 in which the undercut portion is formed, W: Mold for the primary molded body A, Y: Primary material remaining attached to the mold Z. A mold that presses the periphery of the concave portion of the molded body A. Z: the mold on the side where the primary molded body A remains attached. No.
Claims (1)
前記第１の樹脂で形成される一次成形体と第２の樹脂で
形成される二次成形体とによって構成される複合射出成
形体において、該二次成形体との接合面に設けられてい
る一次成形体の凹部には、凹部壁面の少なくとも一部が
凹部内に突出してアンダーカット部が形成され、且つ第
１の樹脂が充填されて二次成形体の一部を構成すること
を特徴とする複合射出成形体。 ２、少なくとも二種類の第１及び第２の樹脂から成り、
第１の樹脂で形成される一次成形体と第２の樹脂で形成
される二次成形体とによって構成される複合成形体を射
出成形する際に、先ず二次成形体との接合面となる部位
に凹部を有する一次成形体を形成し、次いで該一次成形
体の前記凹部の周辺部の少なくとも一部を押圧して凹部
壁面部を凹部内に突出させて凹部にアンダーカット部を
設け、その後、前記凹部及び金型のキャビティ内に第２
の樹脂を射出充填することを特徴とする複合射出成形方
法。 ３、一次成形体の凹部周辺部の押圧が金型に設けられて
いる突起部によってなされる請求項第２項記載の複合射
出成形方法。 ４、一次成形体の凹部周辺部の押圧が前記凹部周辺部に
予め形成されている凸部を押圧することによってなされ
る請求項第２項記載の複合射出成形方法。 ５、一次成形体の凹部周辺部の押圧が前記凹部側壁の少
なくとも一方の押圧によってなされる請求項第２項記載
の複合射出成形方法。 ６、第２の樹脂の射出充填が一次成形体の凹部開口部の
全周辺部を押圧しつつなされる請求項第２項記載の複合
射出成形体。 ７、少なくとも二種類の第１及び第２の樹脂から成り、
第１の樹脂で形成される一次成形体と第２の樹脂で形成
される二次成形体とによって構成される複合成形体を射
出成形する装置であって、二次成形体との接合面となる
部位に凹部を有する一次成形体を成形する一対の金型と
、 得られる一次成形体の前記凹部の周辺部の 少なくとも一部を押圧して凹部壁面部を凹部内に突出さ
せて凹部にアンダーカット部を形成するための押圧部を
有する金型と、 前記一次成形体を収容し且つ二次成形体を 形成するキャビティを有し、該キャビティ内及び一次成
形体の前記凹部内に第２の樹脂を射出充填する一対の金
型とを具備することを特徴とする複合射出成形装置。 ８、一次成形体の凹部周辺部を押圧する金型の押圧部が
突起部である請求項第７項記載の射出複合成形装置。 ９、一次成形体を成形する一対の金型が凹部周辺部に凸
部を有する一次成形体を得ることができるキャビティを
形成する請求項第７項記載の複合射出成形装置。 １０、一次成形体Ａの凹部周辺部を押圧する金型の押圧
部が前記凹部側壁の少なくとも一方を押圧する請求項第
７項記載の複合射出成形装置。 １１、一次成形体を形成する一対の金型のうち、一次成
形体を形成してから型開きする際に一次成形体が付着残
留する側の金型を、一次成形体の凹部にアンダーカット
部を形成する押圧部を有する金型と組合わせる金型に共
用して成る請求項第７項記載の複合射出成形装置。 １２、一次成形体を形成する一対の金型のうち、一次成
形体を形成してから型開きする際に一次成形体が付着残
留する側の金型を、二次成形体を成形する一対の金型の
うち一次成形体を収容する金型に共用して成る請求項第
７項記載の複合射出成形装置。 １３、第２の樹脂を射出充填する金型内に、一次成形体
の凹部開口部の全周辺部を押圧する押圧部が設けられて
いる請求項第７項記載の複合射出成形装置。 １４、二種類の第１及び第２の樹脂が非相溶性樹脂であ
る請求項第１項記載の複合射出成形体、請求項第２項記
載の複合射出成形方法、又は請求項第７項記載の複合射
出成形装置。 １５、第２の樹脂で形成される二次成形体が弾性重合体
から成るシール部材である請求項第１項記載の複合射出
成形体、請求項第２項記載の複合射出成形方法、又は請
求項第７項記載の複合射出成形装置。[Claims] 1. Consisting of at least two types of first and second resins,
In a composite injection molded article constituted by a primary molded article made of the first resin and a secondary molded article made of the second resin, the injection molded article is provided on a joint surface with the secondary molded article. The recess of the primary molded body is characterized in that at least a part of the wall surface of the recess protrudes into the recess to form an undercut portion, and is filled with the first resin to form a part of the secondary molded body. Composite injection molded body. 2. Consisting of at least two types of first and second resins,
When injection molding a composite molded body composed of a primary molded body formed of a first resin and a secondary molded body formed of a second resin, the first part becomes the joint surface with the secondary molded body. forming a primary molded body having a concave portion at a portion thereof, then pressing at least a portion of the periphery of the concave portion of the primary molded body to cause the concave wall portion to protrude into the concave portion to provide an undercut portion in the concave portion; , a second in the recess and the cavity of the mold.
A composite injection molding method characterized by injection filling of resin. 3. The composite injection molding method according to claim 2, wherein the pressing of the peripheral portion of the recess of the primary molded body is performed by a protrusion provided on the mold. 4. The composite injection molding method according to claim 2, wherein the pressing of the periphery of the concave portion of the primary molded body is performed by pressing a convex portion previously formed in the periphery of the concave portion. 5. The composite injection molding method according to claim 2, wherein the peripheral portion of the recess of the primary molded body is pressed by pressing at least one side wall of the recess. 6. The composite injection molded article according to claim 2, wherein the injection filling of the second resin is performed while pressing the entire periphery of the recess opening of the primary molded article. 7. Consisting of at least two types of first and second resins,
An apparatus for injection molding a composite molded body composed of a primary molded body formed of a first resin and a secondary molded body formed of a second resin, the apparatus comprising: a joint surface with the secondary molded body; a pair of molds for molding a primary molded body having a concave portion at a portion thereof; a mold having a pressing part for forming a cut part; a cavity for accommodating the primary molded body and forming a secondary molded body; A composite injection molding apparatus comprising a pair of molds for injection filling with resin. 8. The injection composite molding apparatus according to claim 7, wherein the pressing part of the mold that presses the peripheral part of the recess of the primary molded body is a protrusion. 9. The composite injection molding apparatus according to claim 7, wherein the pair of molds for molding the primary molded product form a cavity capable of obtaining the primary molded product having a convex portion around the concave portion. 10. The composite injection molding apparatus according to claim 7, wherein the pressing part of the mold that presses the peripheral part of the recess of the primary molded body A presses at least one of the side walls of the recess. 11. Of the pair of molds for forming the primary molded object, place the mold on the side where the primary molded object will remain attached when opening the mold after forming the primary molded object into an undercut part in the concave part of the primary molded object. 8. The composite injection molding apparatus according to claim 7, wherein the composite injection molding apparatus is used in combination with a mold having a pressing portion for forming a mold. 12. Of the pair of molds for forming the primary molded body, the one on which the primary molded body remains attached when opening the mold after forming the primary molded body is used as the mold for the pair of molds for forming the secondary molded body. 8. The composite injection molding apparatus according to claim 7, which is commonly used as a mold for accommodating the primary molded body. 13. The composite injection molding apparatus according to claim 7, wherein the mold for injecting and filling the second resin is provided with a pressing part for pressing the entire periphery of the opening of the recess of the primary molded body. 14. The composite injection molded article according to claim 1, the composite injection molding method according to claim 2, or the composite injection molding method according to claim 7, wherein the two types of first and second resins are incompatible resins. composite injection molding equipment. 15. The composite injection molded article according to claim 1, the composite injection molding method according to claim 2, or the claim, wherein the secondary molded article formed of the second resin is a sealing member made of an elastic polymer. The composite injection molding apparatus according to item 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1066542A JPH064262B2 (en) | 1988-05-11 | 1989-03-18 | COMPOSITE INJECTION MOLDED BODY, MOLDING METHOD THEREOF, AND COMPOSITE INJECTION MOLDING APPARATUS |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63114453 | 1988-05-11 | ||
| JP63-114453 | 1988-05-11 | ||
| JP1066542A JPH064262B2 (en) | 1988-05-11 | 1989-03-18 | COMPOSITE INJECTION MOLDED BODY, MOLDING METHOD THEREOF, AND COMPOSITE INJECTION MOLDING APPARATUS |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02139215A true JPH02139215A (en) | 1990-05-29 |
| JPH064262B2 JPH064262B2 (en) | 1994-01-19 |
Family
ID=26407737
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1066542A Expired - Lifetime JPH064262B2 (en) | 1988-05-11 | 1989-03-18 | COMPOSITE INJECTION MOLDED BODY, MOLDING METHOD THEREOF, AND COMPOSITE INJECTION MOLDING APPARATUS |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH064262B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100643510B1 (en) * | 2005-01-20 | 2006-11-10 | 박현문 | An apparatus for manufacturing semiconductor device for a large o-ring and thereby manufactured a semiconductor device for a large o-ring |
| JP2012145237A (en) * | 2011-01-06 | 2012-08-02 | Denso Corp | Heat exchanger and method of manufacturing the same |
| JP2016503697A (en) * | 2013-01-11 | 2016-02-08 | デンツプライ インターナショナル インコーポレーテッド | Apparatus and method usable with an injection molding machine to manufacture articles, particularly orthodontic brackets |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5333714U (en) * | 1977-08-08 | 1978-03-24 | ||
| JPS5557441A (en) * | 1978-10-24 | 1980-04-28 | Nissei Plastics Ind Co | Composite synthetic resin molding |
| JPS57189834A (en) * | 1981-05-19 | 1982-11-22 | Canon Inc | Double-color forming method |
-
1989
- 1989-03-18 JP JP1066542A patent/JPH064262B2/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5333714U (en) * | 1977-08-08 | 1978-03-24 | ||
| JPS5557441A (en) * | 1978-10-24 | 1980-04-28 | Nissei Plastics Ind Co | Composite synthetic resin molding |
| JPS57189834A (en) * | 1981-05-19 | 1982-11-22 | Canon Inc | Double-color forming method |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100643510B1 (en) * | 2005-01-20 | 2006-11-10 | 박현문 | An apparatus for manufacturing semiconductor device for a large o-ring and thereby manufactured a semiconductor device for a large o-ring |
| JP2012145237A (en) * | 2011-01-06 | 2012-08-02 | Denso Corp | Heat exchanger and method of manufacturing the same |
| JP2016503697A (en) * | 2013-01-11 | 2016-02-08 | デンツプライ インターナショナル インコーポレーテッド | Apparatus and method usable with an injection molding machine to manufacture articles, particularly orthodontic brackets |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH064262B2 (en) | 1994-01-19 |
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