WO1992000840A1 - Moulage d'insert pour composants encapsules non rigides - Google Patents

Moulage d'insert pour composants encapsules non rigides Download PDF

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Publication number
WO1992000840A1
WO1992000840A1 PCT/US1991/004673 US9104673W WO9200840A1 WO 1992000840 A1 WO1992000840 A1 WO 1992000840A1 US 9104673 W US9104673 W US 9104673W WO 9200840 A1 WO9200840 A1 WO 9200840A1
Authority
WO
WIPO (PCT)
Prior art keywords
cavity
interior
injection
rigid
mold
Prior art date
Application number
PCT/US1991/004673
Other languages
English (en)
Inventor
Roberd Gerald Dickie
Michael Phillips
Original Assignee
Paige Manufacturing, Inc.
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 Paige Manufacturing, Inc. filed Critical Paige Manufacturing, Inc.
Priority to CA002086518A priority Critical patent/CA2086518A1/fr
Priority to JP91512307A priority patent/JPH05507890A/ja
Publication of WO1992000840A1 publication Critical patent/WO1992000840A1/fr

Links

Classifications

    • 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
    • B29C45/14073—Positioning or centering articles in the mould using means being retractable during injection
    • 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
    • B29C45/14639—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 for obtaining an insulating effect, e.g. for electrical components

Definitions

  • This invention relates to methods and apparatus for plastic injection molding, and, more particularly, to molded plastic products with non- rigid encapsulated components and methods of making such products.
  • the problem of precisely positioning encapsulated components within an injection molding cavity can be further complicated by two additional factors. If the component to be encapsulated is not rigid, the problem of holding it in a precise position is far more difficult. Furthermore, the the dimensions of the the molded product may be such that very little leeway exists for positioning the encapsulated component away from the surfaces of the mold. If the component is not precisely and firmly positioned in the interior of a thin molding cavity, for example, a problem called "component breakout" occurs in which some or all of the encapsulated component is visible at the surface of the molded product. Such breakout is normally grounds for rejecting the product. Summarv of the Invention
  • encapsulated components are captured at a precise position in the interior of the mold cavity by means of retractable thin, flat, rigid "blades” or “forks” having one end fabricated with a contour which mates with and captures the encapsulated component.
  • the blade or fork rigidly holds the encapsulated component at a precise position in the interior of the mold cavity during the plastic injection process.
  • the blades or forks can be retracted to allow the molding material to flow and fill the thin voids left by the Wades or forks.
  • the blades are made as thin as possible and yet maintain sufficient rigidity to hold the encapsulated component in the precise position desired.
  • the blades can be left in the mold until after the plastic molding material has set up, and then withdrawn, leaving very small, thin voids in the molded product. This latter procedure is possible only if thin slots left by the blades or forks do not adversely affect the usefulness or appearance of the molded product.
  • the blade or fork can be biased into the interior of the molding cavity with a spring the force of which is overcone only by the higher pressure of the final "packing" portion of the molding cycle.
  • the blades or forks will then be automatically ejected from the molding cavity at precisely the correct time to permit filling the voids left behind by the retracting blades during the packing period.
  • FIG. 1 shows a partially cut-away perspective view of the lower die of a plastic injection mold showing the arrangement of both rigid and non-rigid components within the molding cavity, and showing the use of thin Wades to hold electrical wires in place during the injection operation;
  • FIG. 2 shows a partial cross-sectional view of the injection mold of FIG. 1 showing the position-holding Wades in the extended position holding non-rigid wires in a precise location between the upper and lower surfaces of the mold cavity;
  • FIG. 3 shows a partial cross-sectional view of the molded product produced by the mold of FIG. 2, showing one position-holding Wade;
  • FIG. 4 shows another partial cross-sectional view of the injection mold of FIG. 1 showing the position-holding blade retracted;
  • FIG. 5 shows a partial cross-sectional view of the molded product produced by the mold of FIG. 4 with the position-holding Wade retracted;
  • FIG. 6 shows a perspective partial sectional view of a molded three-prong electrical plug molded by using the position-holding Wades of the present invention and tab clips on one of the electrical prongs to assist in holding the electrical wires in position during the molding process;
  • FIG. 7 shows a cross-sectional view of the cavity mold used to produce the molded product of FIG. 6, showing the position-holding Wades in their extended position;
  • FIG. 8 is a perspective view of the tab clips on the electrical ground prong of FIG. 6 used to assist in holding the electrical wire in position during the molding process.
  • FIG. 1 there is shown a partial perspective view of the lower die 10 of a cavity injection mold comprising a mold half cavity 11 in the shape of a thin hexagonal electrical plug. Electrical prongs or connector pins connected to stabilizing lands 12 and 13 extend out of cavity 11 through slots 14 and 15, respectively. Slots 14 and 15 have bottoms located so as to precisely position lands 12 and 13 in the interior of mold cavity 11. Insulated wires 16 and 17 join together in sleeve portion 18 of mold cavity 11 to form line cord 19. One end of wire 16 is electrically attached to land 12 while one end of wire 17 is electrically attached to land 13. In addition, wire 16 is physically attached to land 12 by crimp 20 while wire 17 is physically attached to land 13 by crimp 21.
  • the two half cavities are fastened tightly together in the core of a molding machine.
  • Molten plastic is injected under high pressure (50- 150 tons per square inch) to entirely fill all of the voids in the the mold cavity.
  • the injection pressure is raised even higher for a brief period to ensure complete filling of all voids in the cavity. This higher pressure at the end of the injection cycle is called the "packing" portion of the injection molding cycle.
  • the mold is opened and the molded product is ejected from the mold by means of an ejection piston 26.
  • the wires 16 and 17 and the line cord 19 are supported in the interior of the mold cavity by a plurality of thin metallic blades 23, 24 and 25.
  • the Wades 23-25 have a contour formed into their upper edge which mates with and captures wire 16. That is, the upper edge of blade 24 has a contour which is slightly more than a half of the periphery of wire 16 and thus is able to "grab" the soft insulation of wire 16 and hold it in position.
  • Blade 23 has a contour in its upper edge which mates with the double wire line cord 19 and also extends beyond the semicircular periphery of the two wire of line cord 19 to hold the line cord in position.
  • the cavity formed by the two dies is extremely thin and hence very little leeway is availaWe for the placement of wires 16 and 17 and line cord 19 within the cavity 11. If these wires are not placed precisely in the molding cavity, and held in that position during the entire injection process, the wires will be moved by the advancing molten plastic and possiWy end up being in contact with the exterior surface of the mold cavity 11.
  • any wires pushed to the surface of the mold cavity are visiWe at the surface of the completed plug. This result is called “wire breakout" and is sufficiently unaesthetic to result in rejection of molded products exhiWting such wire breakout.
  • retractaWe positioning Wades 23, 24 and 25 position the non-rigid wires 16 and 17 and line cord 19 precisely within the mold cavity and maintain these non-rigid components at that precise position throughout the molding process.
  • the number and positions of the Wades such as Wades 23-25 are directly dependent on the desired disposition of the wires within the cavity and the length of the wire runs requiring support.
  • the three Wades 23-25 in FIG. 1 are sufficient for the wires in the electrical plug depicted therein.
  • Blades 23-25 can be retracted, for example by hydraulic pistons, not shown, just before the packing portion of the molding cycle so that the voids formed by the retracted blades can be filled by the still flowing plastic material.
  • the Wades 23-25 can be spring-loaded such that they are held in the position-stabilizing position for the initial portion of the injection cycle, but are pushed out of the mold cavity 11 by the higher pressure exerted during the packing portion of the injection cycle.
  • the Wades 23-25 can be retracted after the entire molding cycle is completed, leaving the thin slots from which the Wades are removed in the finished molded product.
  • blades 23-25 are thin enough and positioned so as to minimize the appearance of such slots, it may not be necessary to fill the voids left by Wades 23-25 at all. Indeed, the surface of the finished product can be decorated with slot-like decorations in the midst of which the actual Wade slots become virtually invisiWe.
  • FIG. 2 there is shown a partial cross-sectional view of the assembled mold comprising lower die 10 and a mating upper die 27 forming the mold cavity 11 therebetween.
  • the electrical prong 28 attached to land 12 supports land 12 in the interior of cavity 11 while blades 24 and 25 support wire 17 in the interior of cavity 11.
  • FIG. 3 is a partial cross-section of the molded plug 29 showing the wire 17 suspended therein and supported by Wade 24.
  • FIG. 4 there is shown a partial cross-sectional view of the same assemWed mold of FIG. 2, but with the positioning blades 23-25 retracted out of the molding cavity 11.
  • FIG. 5 there is shown a partial cross-section of the molded plug 29 with the wire 17 suspended in the hardened plastic and with the supporting blades 23-25 removed, leaving cavity void 30.
  • void 30 can be filled by retracting the blade prior to the packing portion of the injection cycle, or the void 30 can be left unfilled by retracting the blade after the end of the injection cycle and after the plastic has hardened.
  • FIGS. 1-5 the method and apparatus of the present invention for positioning non-rigid components in the interior of molded products is shown in FIGS. 1-5 in connection with molded electrical plugs, it will be apparent to persons of ordinary skill in the injection molding art that this method and apparatus can be used for positioning components in the interior of many other molded products, whether rigid or non-rigid.
  • Thin blades or forks are used having the edge interior to the mold cavity contoured to match the exterior surface of the component to be positioned. Such blades or forks can be used to precisely position a large number of encapsulated components within the interior of molded plastic products without departing from the spirit or scope of this invention.
  • FIG. 6-8 there is shown a perspective view, in partial section, of a three-prong electrical plug fabricated by injection molding techniques in accordance with the present invention.
  • the plug body 40 encapsulates the three wires of the three-wire line cord 41 as well as staWlizing lands for ground pin 42 and power pins including pin 43 and a second power pin, not visiWe in FIG. 6.
  • ground pin 42 has two channel-forming tabs 44 and 45 used to assist in capturing the electrical wire 46 connected to power pin 43. Thin Wades with appropriately contoured upper edges are also used to assist in positioning wire 46 in other portions of the mold cavity.
  • the mold cavity is shown in cross-section in FIG. 7.
  • the two half molds 50 and 51 define a mold cavity 52 therebetween in which wire 46 is positioned in part by blades 53 and 54 and in part by the upper portion of ground pin 42, shown in perspective view in FIG. 8.
  • the tabs 44 and 45 capture wire 46 to hold wire 46 in position during the molding process. Since wire 46 is fully insulated, the contact by tabs 44 and 45 does not interfere with the electrical circuit.
  • a crimping land 56 is also fashioned on ground pin 42 to provide a place to electrically and mechanically connect the ground wire of line cord 41 to the ground pin 42.

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)

Abstract

Technique de moulage par injection dans laquelle des composants non rigides ou flexibles destinés à être encapsulés à l'intérieur d'un produit moulé par injection sont maintenus en position à l'intérieur d'une cavité de moule (11) pendant l'opération d'injection, à l'aide de fourches ou de lames minces rigides (23, 24, 25) dotées de surfaces intérieures à cavité du moule profilée pour s'adapter au composant non rigide flexible (17, 19) et pour le prendre. Lesdites fourches ou lames peuvent être rétractées avant la partie de garniture finale du cycle de moulage afin de permettre un écoulement plastique dans le vide laissé par les lames rétractées, ou les lames peuvent être rétractées après la fin des cycles d'injection et les vides laissés dans le produit moulé. Des parties mêmes des composants encapsulés peuvent être façonnées de manière à prendre et à maintenir des parties d'autres composants encapsulés pendant le processus d'injection.
PCT/US1991/004673 1990-07-09 1991-07-01 Moulage d'insert pour composants encapsules non rigides WO1992000840A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CA002086518A CA2086518A1 (fr) 1990-07-09 1991-07-01 Moulage par insertion pour composants encapsules non rigides
JP91512307A JPH05507890A (ja) 1990-07-09 1991-07-01 固くない封入部品のための挿入成型法

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US55138190A 1990-07-09 1990-07-09
US551,381 1990-07-09

Publications (1)

Publication Number Publication Date
WO1992000840A1 true WO1992000840A1 (fr) 1992-01-23

Family

ID=24201041

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1991/004673 WO1992000840A1 (fr) 1990-07-09 1991-07-01 Moulage d'insert pour composants encapsules non rigides

Country Status (4)

Country Link
EP (1) EP0538375A4 (fr)
JP (1) JPH05507890A (fr)
CA (1) CA2086518A1 (fr)
WO (1) WO1992000840A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999010152A1 (fr) * 1997-08-29 1999-03-04 Ut Automotive Dearborn, Inc. Appareil servant a centrer un faisceau de cables dans un moule
FR2799879A1 (fr) * 1999-10-15 2001-04-20 Siemens Automotive Sa Faisceau de cables surmoules et procede de fabrication associe
EP1223639A1 (fr) * 2001-01-11 2002-07-17 The Furukawa Electric Co., Ltd. Chip d'antenne et sa procédé de fabrication
US7931184B2 (en) 2006-09-18 2011-04-26 Spinduction Weld, Inc. Apparatus for induction friction solid state welding
CN113085081A (zh) * 2021-03-31 2021-07-09 广州欣凯裕生物科技有限公司 一种etc面板生产的注塑冷却装置

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102529015A (zh) * 2012-01-16 2012-07-04 焦志红 一种塑胶产品和皮具贴合的方法
JPWO2023013375A1 (fr) * 2021-08-06 2023-02-09

Citations (3)

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Publication number Priority date Publication date Assignee Title
GB1430579A (fr) * 1972-06-21 1976-03-31 Gkn Sankey Ltd
US4381908A (en) * 1976-06-25 1983-05-03 Werkzeugbau Wolfgruben Gmbh Mold apparatus for forming profile employing reinforcing preform
US4470786A (en) * 1981-07-28 1984-09-11 Omron Tateisi Electronics Co. Molding apparatus with retractable preform support pins

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL85473C (fr) * 1953-01-29
FR1105275A (fr) * 1954-05-24 1955-11-29 Prise de courant moulée, en matière plastique
GB1223877A (en) * 1968-06-04 1971-03-03 British Insulated Callenders Improvements in or relating to the manufacture of cable couplings
JPS55121864A (en) * 1979-03-14 1980-09-19 Bolton Emerson Rotary roddrotary push roll nip type covering device
JPS5818223A (ja) * 1981-07-28 1983-02-02 Omron Tateisi Electronics Co 成型方法
FR2543356B1 (fr) * 1983-03-25 1986-01-10 Ceraver Procede et dispositif de moulage du revetement isolant d'un isolateur organique de grande longueur
DE8622028U1 (de) * 1986-08-16 1986-12-18 Chemieschutz Gesellschaft für Säurebau mbH, 6140 Bensheim Abstandshalter zum Zentrieren von im Spritzgußverfahren zu ummantelnden Kernen im Gießformhohlraum
JP2816732B2 (ja) * 1989-12-27 1998-10-27 住友電装株式会社 ブレーキパッド摩耗検知装置用プローブの製造方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1430579A (fr) * 1972-06-21 1976-03-31 Gkn Sankey Ltd
US4381908A (en) * 1976-06-25 1983-05-03 Werkzeugbau Wolfgruben Gmbh Mold apparatus for forming profile employing reinforcing preform
US4470786A (en) * 1981-07-28 1984-09-11 Omron Tateisi Electronics Co. Molding apparatus with retractable preform support pins

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP0538375A4 *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999010152A1 (fr) * 1997-08-29 1999-03-04 Ut Automotive Dearborn, Inc. Appareil servant a centrer un faisceau de cables dans un moule
US6071446A (en) * 1997-08-29 2000-06-06 Lear Automotive Dearborn, Inc Method for centering wire harness in mold
FR2799879A1 (fr) * 1999-10-15 2001-04-20 Siemens Automotive Sa Faisceau de cables surmoules et procede de fabrication associe
EP1223639A1 (fr) * 2001-01-11 2002-07-17 The Furukawa Electric Co., Ltd. Chip d'antenne et sa procédé de fabrication
US6583762B2 (en) 2001-01-11 2003-06-24 The Furukawa Electric Co., Ltd. Chip antenna and method of manufacturing the same
US7931184B2 (en) 2006-09-18 2011-04-26 Spinduction Weld, Inc. Apparatus for induction friction solid state welding
CN113085081A (zh) * 2021-03-31 2021-07-09 广州欣凯裕生物科技有限公司 一种etc面板生产的注塑冷却装置

Also Published As

Publication number Publication date
CA2086518A1 (fr) 1992-01-10
EP0538375A1 (fr) 1993-04-28
EP0538375A4 (en) 1993-10-13
JPH05507890A (ja) 1993-11-11

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