JPS6176333A - Jointing method among molded articles by injection molding - Google Patents

Jointing method among molded articles by injection molding

Info

Publication number
JPS6176333A
JPS6176333A JP16898685A JP16898685A JPS6176333A JP S6176333 A JPS6176333 A JP S6176333A JP 16898685 A JP16898685 A JP 16898685A JP 16898685 A JP16898685 A JP 16898685A JP S6176333 A JPS6176333 A JP S6176333A
Authority
JP
Japan
Prior art keywords
core
molded
resin
cavity
cavities
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
Application number
JP16898685A
Other languages
Japanese (ja)
Other versions
JPH0349730B2 (en
Inventor
Toshiyuki Kanai
金井 俊行
Yasuo Tsuchiya
土屋 康雄
Minoru Yamazaki
実 山崎
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nissei Plastic Industrial Co Ltd
Original Assignee
Nissei Plastic Industrial Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nissei Plastic Industrial Co Ltd filed Critical Nissei Plastic Industrial Co Ltd
Priority to JP16898685A priority Critical patent/JPS6176333A/en
Publication of JPS6176333A publication Critical patent/JPS6176333A/en
Publication of JPH0349730B2 publication Critical patent/JPH0349730B2/ja
Granted legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/16Making multilayered or multicoloured articles
    • B29C45/1635Making multilayered or multicoloured articles using displaceable mould parts, e.g. retractable partition between adjacent mould cavities
    • B29C45/1639Removable partitions between adjacent mould cavity portions

Landscapes

  • 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)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

PURPOSE:To enable to unify reliably two molded articles at the time of injection molding, by providing a first core opening and closing a communication part and a second core whose tip provided with a stepped part is brought into contact with the first core are provided on one side of two cavities provided by making them communicate with each other. CONSTITUTION:Two cavities having resin pouring inlets respectively are provided within the same mold by making the cavities communicate with each other, and an advancable and retreatable first core 9 opening and closing a communication part 6 and an advancable and retreatable second core 10 whose tip provided with a stepped part 10a is brought into contact with the first core 9 are provided on the communication part 6 of the one side cavity 4. The first core 9 and second core 10 are made to abut against each other by making them move forward and the communication part 6 is closed by the first core 9. Then after a molded material 11 has been molded by injecting resin to the cavity 4, both the cores are moved backward up to a mold surface. Then when the other resin is injected successively to the other cavity 5, a spacial part 12 is filled with a part of the resin by flowing the resin into the spacial part 12 through the communication part 6 and a joint part 15 which is unified with the molded material 11 is generated through an undercut 14 formed by the stepped part 10a.

Description

【発明の詳細な説明】 (産業上の利用分野) この発明は同一金型内にて射出成形された2つの成形体
を成形と同時に一体に結合する射出成形による成形体相
互の結合方法に関するものである。
[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a method for joining molded bodies together by injection molding, in which two molded bodies injection molded in the same mold are joined together at the same time as molding. It is.

(従来の技術) 一般に射出成形時における2つの成形体の結合は、樹脂
の融着を利用して行っている。また2つの成形体が異な
った樹脂で、融着が困難であったり、また収縮率の差か
ら後で結合部が破損する虞れがある場合には、成形後に
接着剤やビス或は嵌込みなどの手段を用いて結合を行っ
ている。
(Prior Art) Generally, two molded bodies are joined during injection molding using resin fusion. In addition, if the two molded objects are made of different resins and it is difficult to fuse them together, or if there is a risk that the joint will be damaged later due to the difference in shrinkage rate, use adhesives, screws, or insets after molding. The connection is performed using methods such as

(発明が解決しようとする問題点) このため2つの成形体を材質が異なった樹脂をもって成
形する場合、収縮率がほぼ同じで融着し易い材質を選択
しなければならぬことから、使用樹脂が限定される問題
があった。
(Problem to be solved by the invention) For this reason, when molding two molded bodies using resins of different materials, it is necessary to select materials that have approximately the same shrinkage rate and are easy to fuse, so the resin used must be There was a problem in that it was limited.

また成形後に結合を行う場合には、それだけ工程数が増
すので、生産に時間を要し、ロスなども生ずることから
コスト高となる欠点があった。
Furthermore, when bonding is performed after molding, the number of steps increases accordingly, which results in longer production times and losses, resulting in higher costs.

(問題点を解決するための手段) この発明は上記従来の問題点を解決するために考えられ
たものであって、その目的は融着なる手段を用いずに2
つの成形体を射出成形時に確実に、  一体化すること
ができ、また用いる樹脂の収縮率が異なっていても、そ
の収縮率の差によって結合部が破損することもない成形
体相互の結合方法を提供することにある。
(Means for Solving the Problems) This invention has been devised to solve the above-mentioned conventional problems, and its purpose is to achieve two
We have developed a method for joining molded bodies that can reliably integrate two molded bodies during injection molding, and that will not damage the bonded parts due to the difference in shrinkage rate even if the resins used have different shrinkage rates. It is about providing.

このような目的によるこの発明は、同一金型内に樹脂注
入口をそれぞれ有する2つのキャビティを互に連通させ
て設け、そのキャビティの一方に連通部の開閉部材を兼
ねる所要寸法の第1コアと、該第1コアの対向位置にあ
って、段部な設けた先端が第1コアと接する第2コアと
を進退自在に設け、この2つのコアと段部とにより、一
方のキャビティにて射出成形された成形体内に、上記連
通部と接続した空間部を形成し、その空間部に他方のキ
ャビティにより射出成形された成形体の一部を充填して
、アンダーカットにより一体化された結合部を形成して
なる。
According to the present invention, two cavities each having a resin injection port are provided in the same mold so as to communicate with each other, and one of the cavities is provided with a first core of a required size that also serves as an opening/closing member for the communication portion. , a second core is provided at a position opposite to the first core and whose stepped tip is in contact with the first core, and is movable back and forth, and these two cores and the stepped portion allow injection to be carried out in one cavity. A joint part formed by forming a space connected to the communication part in the molded body, filling the space with a part of the molded body injection-molded by the other cavity, and integrating the molded body by an undercut. It forms.

(作 用) 上記方法では、一方のキャビティに設けた第1コアと第
2コアとを当接し、そのキャビティに樹脂を射出して一
方の成形体を成形したのち、上記コアを型面まで後退移
動させると、上記成形体に他方のキャビティと連通した
空間部が生じ、またその空間部には上記第2コアの段部
によってアンダーカットが形成される。
(Function) In the above method, a first core and a second core provided in one cavity are brought into contact with each other, resin is injected into the cavity to form one molded body, and then the core is retreated to the mold surface. When moved, a space is created in the molded body that communicates with the other cavity, and an undercut is formed in the space by the stepped portion of the second core.

上記空間部にはコアを後退移動したのちに、他方のキャ
ビティに射出された樹脂が連通部より流入し、そこにア
ンダーカットによって離脱を阻止された結合部が生ずる
After the core is moved backward, the resin injected into the other cavity flows into the space from the communication part, and a joint is formed therein which is prevented from separating by the undercut.

これを図示の例により具体的に説明する。なお同一部分
は同一符号をもって示す。
This will be explained in detail using an illustrated example. Note that the same parts are indicated by the same symbols.

(実施例) 実施例1(第1図から第3図) まず金型の構造に付いて説明すると、同一金型1の固定
型2と可動型3との間に2つのキャビティ4,5を近接
して設けるとともに、両キャビティ4,50所要個所に
間隙による連通部6を形成して置く、また各キャビティ
4,5には、固定型2に設けた樹脂路7,8の注入口を
設けて、キャビテイ毎に樹脂の注入を行えるようにする
(Example) Example 1 (Figures 1 to 3) First, to explain the structure of the mold, two cavities 4 and 5 are provided between the fixed mold 2 and the movable mold 3 of the same mold 1. Both cavities 4 and 50 are provided close to each other, and communication portions 6 are formed through gaps at required locations, and each cavity 4 and 5 is provided with an injection port for the resin passages 7 and 8 provided in the fixed mold 2. This allows resin to be injected into each cavity.

更にまた一方のキャビティ4の連通部6に隣接した部分
には、該連通部6を開閉する固定盤2側の進退自在な第
1コア9と、その第1コア90対向位置にあって、段部
10aを設けた先端が第1コア9と接する可動盤3側の
進退自在な第2コア1゜とが設けられている。
Furthermore, in a portion of one cavity 4 adjacent to the communication section 6, there is a first core 9 that can move forward and backward on the fixed platen 2 side that opens and closes the communication section 6, and a step that is located opposite the first core 90. A second core 1° is provided on the side of the movable platen 3, the tip of which is provided with the portion 10a, in contact with the first core 9, and is movable forward and backward.

上記金型を用いての射出成形は、まず第1図に示すよう
に、第1コア9と第2コア10とを前進移動させて互に
当接するとともに、第1コア9により連通部6を閉鎖す
る。
Injection molding using the above mold is performed by first moving the first core 9 and the second core 10 forward to abut each other, as shown in FIG. Close.

次にキャビティ4に樹脂を射出して成形体11を成形し
たのち、両方のコアを型面まで後退移動すると、第2図
に示すように、連通部6から成形体内に空間部12が生
ずる。
Next, after resin is injected into the cavity 4 to form a molded body 11, when both cores are moved backward to the mold surface, a space 12 is created in the molded body from the communication portion 6, as shown in FIG.

そこで引続いて他方のキャピテイ5に他の樹脂を射出す
ると、その樹脂の一部が連通部6より上記空間部12に
流入して充填され、キャビティ5にて成形体13が成形
されると同時に、上記段部10aにより形成されたアン
ダーカッ) 14によって、成形体11と一体化した結
合部15が生ずる。
Then, when another resin is subsequently injected into the other cavity 5, a part of the resin flows into the space 12 from the communication part 6 and is filled, and at the same time the molded body 13 is molded in the cavity 5. , the undercut 14 formed by the step 10a creates a joint 15 that is integrated with the molded body 11.

この結合部15によって、成形体11 、13は同質ま
たは異質の材料を問わず第4図に示すように一体に結合
し、その結合部15が破壊されない限り一体化が損われ
るようなことがない。
Due to this joining part 15, the molded bodies 11 and 13 are joined together as shown in FIG. 4, regardless of whether they are made of the same or different materials, and the integration will not be impaired unless the joining part 15 is destroyed. .

実施例2(第5図及び第6図) この実施例は、第7図及び第8図に示す時計の本体部2
1とベルト部22とを射出成形時に一体に結合した場合
であって、このときは本体部21を成形する上記一方の
キャビティ40両側に、ベルト部nを形成する他方のキ
ャビティ5,5を隣設し、キャビティ4に両方の連通部
6,6をそれぞれ開閉する一対の第1コア9,9を、ア
ンダーカット14を成形する段部10aを先端に設けた
一対の第2コア10 、 toとを、実施例1の場合と
同様に組合わせて設ける。
Embodiment 2 (FIGS. 5 and 6) This embodiment is based on the main body part 2 of the watch shown in FIGS. 7 and 8.
1 and the belt part 22 are integrally combined during injection molding, and in this case, the cavities 5, 5 forming the belt part n are placed adjacent to each other on both sides of the above-mentioned one cavity 40 in which the main body part 21 is molded. A pair of first cores 9, 9 for opening and closing both communicating portions 6, 6, respectively, are installed in the cavity 4, and a pair of second cores 10, to which a stepped portion 10a forming an undercut 14 is provided at the tip. are provided in combination in the same manner as in the first embodiment.

射出成形は、キャビティ4に射出した樹脂7による本体
部21の成形を先行し、次に第1コア9と第2コア10
とを後退移動させてから、キャビティ5に樹脂8を射出
してベルト部nを成形する。このベルト部乙を形成する
樹脂の一部は、実施例1と同様に連通部6,6かもアン
ダーカット14が突出成形された本体部21の内部に流
入し、そこに結合部15を形成して本体部21と一体化
される。
In the injection molding, the main body part 21 is first molded with the resin 7 injected into the cavity 4, and then the first core 9 and the second core 10 are molded.
After moving backward, resin 8 is injected into the cavity 5 to form the belt part n. A part of the resin forming the belt part A flows into the main body part 21 from which the communicating parts 6 and 6 have the undercuts 14 protrudingly formed, as in the first embodiment, and forms the joint part 15 there. It is integrated with the main body part 21.

(発明の効果)   ′ この発明は上述のように、互に連通させて設けた2つの
キャビティの一方に、連通部を開閉する第1コアと、該
第1コアの対向位置にあって、段部を設けた先端が第1
コアと接する第2コアとを設け、この2つのコアの移動
をもって、先に射出成形された成形体内に、後に射出成
形された成形体の一部が充填される空間部を形成し、こ
の空間部に突出形成されたアンダーカットにより、一方
の成形体と他方の成形体の一部とが一体化された結合部
を形成し、これにより成形体相互を連結してなるもので
あるから、そこに用いられる樹脂の材質が異なっていて
も、画成形体を確実に結合することができる。
(Effects of the Invention) As described above, the present invention includes a first core that opens and closes the communication portion in one of the two cavities that are provided in communication with each other, and a step that is located opposite to the first core. The tip with the part is the first
A second core that is in contact with the core is provided, and the movement of these two cores forms a space in the previously injection-molded molded product into which a part of the molded product that is later injection-molded is filled. The undercut formed in a protruding manner forms a joint where one molded body and a part of the other molded body are integrated, and this connects the molded bodies to each other. Even if the resin materials used are different, the image molded bodies can be reliably bonded.

また結合部はアンダーカットにより離脱を阻止されてい
るため堅牢であり、収率差があってもそれにより結合部
が破損するようなこともない。しかも成形体の射出成形
と同時に結合も生ずるので、結合のための後加工が不要
となり、コストの低減を図ることができる。更にまた融
着による場合と異なって使用樹脂にも制限がな(、成形
体の用途に応じて自由に樹脂を選択することができるな
どの多くの利点を有する。
Furthermore, the bonded portion is prevented from separating by the undercut, so it is robust, and even if there is a difference in yield, the bonded portion will not be damaged. Moreover, since bonding occurs at the same time as injection molding of the molded bodies, post-processing for bonding is not required, and costs can be reduced. Furthermore, unlike the case of fusion bonding, there are many advantages such as there are no restrictions on the resin used (and the resin can be freely selected depending on the purpose of the molded article).

【図面の簡単な説明】[Brief explanation of the drawing]

図面はこの発明に係る射出成形による成形体相互の結合
方法の実施例を示すもので、第1図から第3図は第1実
施例の成形工程を順に示す金型の略示縦断面図、第4図
は成形体相互の結合部分の縦断面図、第5図及び第6図
は第2実施例の成形工程を順に示す金型の略示縦断面図
、第7図は第2実施例により成形される成形品の平面図
、第8図はその縦断面図である。 5.4・・・・・・キャビティ  6・・・・・・連通
部9・・・・・・第1コア    10・・・・・・第
2コア10a・・・・・・段部      11 、1
3・・・・・・成形体12・・・・・・空間部    
 14・・・・・・アンダーカット15・・・・・・結
合部     21・・・・・・時計本体印22・・・
・・・バンド部
The drawings show an embodiment of the method of joining molded bodies together by injection molding according to the present invention, and FIGS. 1 to 3 are schematic vertical cross-sectional views of a mold sequentially showing the molding process of the first embodiment, FIG. 4 is a vertical cross-sectional view of the bonding portion between molded bodies, FIGS. 5 and 6 are schematic vertical cross-sectional views of a mold sequentially showing the molding process of the second embodiment, and FIG. 7 is a longitudinal cross-sectional view of the molding process of the second embodiment. FIG. 8 is a plan view of the molded product formed by the method, and FIG. 8 is a longitudinal sectional view thereof. 5.4...Cavity 6...Communication section 9...First core 10...Second core 10a...Step part 11, 1
3...Molded body 12...Space part
14... Undercut 15... Joining part 21... Watch body mark 22...
・・・Band club

Claims (1)

【特許請求の範囲】[Claims] 同一金型内に樹脂注入口をそれぞれ有する2つのキャビ
ティを互に連通させて設け、そのキャビティの一方に連
通部の開閉部材を兼ねる所要寸法の第1コアと、該第1
コアの対向位置にあって、段部を設けた先端が第1コア
と接する第2コアとを進退自在に設け、この2つのコア
と段部とにより、一方のキャビティにて射出成形された
成形体内に、上記連通部と接続した空間部を形成し、そ
の空間部に他方のキャビティにより射出成形された成形
体の一部を充填して、アンダーカットにより一体化され
た結合部を形成してなることを特徴とする射出成形によ
る成形体相互の結合方法。
Two cavities, each having a resin injection port, are provided in the same mold so as to communicate with each other, and one of the cavities has a first core of a required size that also serves as an opening/closing member for the communication portion, and the first core
A second core is provided at a position opposite to the core and whose tip with a stepped portion contacts the first core, and is movable back and forth, and injection molding is performed in one cavity using these two cores and the stepped portion. A space connected to the communication part is formed in the body, and a part of the molded body injection molded by the other cavity is filled in the space to form an integrated joint by an undercut. A method for joining molded bodies together by injection molding, characterized in that:
JP16898685A 1985-07-31 1985-07-31 Jointing method among molded articles by injection molding Granted JPS6176333A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16898685A JPS6176333A (en) 1985-07-31 1985-07-31 Jointing method among molded articles by injection molding

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16898685A JPS6176333A (en) 1985-07-31 1985-07-31 Jointing method among molded articles by injection molding

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
JP10345984A Division JPS60247520A (en) 1984-05-22 1984-05-22 Molding method of hinge in synthetic-resin molded article

Publications (2)

Publication Number Publication Date
JPS6176333A true JPS6176333A (en) 1986-04-18
JPH0349730B2 JPH0349730B2 (en) 1991-07-30

Family

ID=15878231

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16898685A Granted JPS6176333A (en) 1985-07-31 1985-07-31 Jointing method among molded articles by injection molding

Country Status (1)

Country Link
JP (1) JPS6176333A (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1568460A1 (en) * 2004-02-24 2005-08-31 Mold-Masters Limited Multiple-material injection molding
JP2005319647A (en) * 2004-05-07 2005-11-17 Calsonic Kansei Corp Molding machine for different kinds of resins
FR2874350A1 (en) * 2004-08-18 2006-02-24 Faurecia Interieur Ind Societe MOLD FOR INJECTION MOLDING OF A PLASTIC PIECE AND MOLDING METHOD
JP2007001197A (en) * 2005-06-24 2007-01-11 Gifu Plast Ind Co Ltd Molding method of synthetic resin injection-molded product and injection mold assembly
JP2007001195A (en) * 2005-06-24 2007-01-11 Gifu Plast Ind Co Ltd Method for molding synthetic resin injection molded article and injection molding die apparatus
JP2007001256A (en) * 2005-06-27 2007-01-11 Gifu Plast Ind Co Ltd Molding method of synthetic resin injection molding and injection molding mold device
JP2007001196A (en) * 2005-06-24 2007-01-11 Gifu Plast Ind Co Ltd Molding method of synthetic resin injection-molded product and injection mold assembly
JP2007261007A (en) * 2006-03-28 2007-10-11 Kasai Kogyo Co Ltd Multiple color molding and its molding method
JP2012056238A (en) * 2010-09-10 2012-03-22 Toyota Boshoku Corp Method for manufacturing multi-color molding, and multi-color molding

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS544957A (en) * 1977-06-14 1979-01-16 Japan Steel Works Ltd Manufacture of multiicolor and multiimaterial resin moldings
JPS57199636A (en) * 1981-06-03 1982-12-07 Matsushita Electric Ind Co Ltd Mold for forming

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS544957A (en) * 1977-06-14 1979-01-16 Japan Steel Works Ltd Manufacture of multiicolor and multiimaterial resin moldings
JPS57199636A (en) * 1981-06-03 1982-12-07 Matsushita Electric Ind Co Ltd Mold for forming

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1568460A1 (en) * 2004-02-24 2005-08-31 Mold-Masters Limited Multiple-material injection molding
US7462314B2 (en) 2004-02-24 2008-12-09 Mold-Masters (2007) Limited Multiple-material injection molding
JP2005319647A (en) * 2004-05-07 2005-11-17 Calsonic Kansei Corp Molding machine for different kinds of resins
JP4512412B2 (en) * 2004-05-07 2010-07-28 カルソニックカンセイ株式会社 Dissimilar resin molding equipment
JP2008509830A (en) * 2004-08-18 2008-04-03 フォーレシア・アンテリュール・アンデュストリー Mold for injection molding of plastic products and molding method
FR2874350A1 (en) * 2004-08-18 2006-02-24 Faurecia Interieur Ind Societe MOLD FOR INJECTION MOLDING OF A PLASTIC PIECE AND MOLDING METHOD
WO2006021697A1 (en) * 2004-08-18 2006-03-02 Faurecia Interieur Industrie Mould for the injection moulding of a plastic piece and moulding method
US7695270B2 (en) 2004-08-18 2010-04-13 Faurecia Interieur Industrie Mould for the injection moulding of a plastic piece and moulding method
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