WO1989011386A1 - Procede pour positionner de maniere precise des noyaux et/ou des mats dans des preformes en matiere synthetique - Google Patents

Procede pour positionner de maniere precise des noyaux et/ou des mats dans des preformes en matiere synthetique Download PDF

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Publication number
WO1989011386A1
WO1989011386A1 PCT/DE1989/000306 DE8900306W WO8911386A1 WO 1989011386 A1 WO1989011386 A1 WO 1989011386A1 DE 8900306 W DE8900306 W DE 8900306W WO 8911386 A1 WO8911386 A1 WO 8911386A1
Authority
WO
WIPO (PCT)
Prior art keywords
needles
mold
plastic
cavity
mats
Prior art date
Application number
PCT/DE1989/000306
Other languages
German (de)
English (en)
Inventor
Marianne Wieser
Original Assignee
Marianne Wieser
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 Marianne Wieser filed Critical Marianne Wieser
Publication of WO1989011386A1 publication Critical patent/WO1989011386A1/fr

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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
    • B29C45/14065—Positioning or centering articles in the mould
    • B29C45/14073—Positioning or centering articles in the mould using means being retractable during injection
    • B29C2045/1409—Positioning or centering articles in the mould using means being retractable during injection using control means for retraction of the centering means

Definitions

  • the invention relates to a method for the positionally accurate introduction of cores and / or mats into plastic molded parts and devices for carrying out this method.
  • core / mat are to be interpreted broadly and include cores made of any materials, in particular also made of foamed plastic, mats, woven fabrics of all kinds, metal inserts, nets, etc. It is desirable that the hardened molded part has the desired shape Encloses and encloses the core or the mat in a specific position. The fact is, however, that after the plastic has been introduced, the core or mat moves upwards or downwards in an undesirable manner due to buoyancy and flow influences. In order to remedy this, it is known in the prior art to clamp the cores or mat on the edge during the spraying and curing process.
  • the decisive disadvantage of this measure is that the core or mat is not covered on all sides or are insulated from the outside.
  • Another method is to fix the core or mat spatially by introducing pins or blocks into the mold and then to fill the mold with plastic and to enclose blocks and pins with the exception of their contact surface at all times. Corrosion is caused by the fact that it is not embedded in the plastic due to the system.
  • the invention has set itself the task of creating a method and an associated device in which the production of plastic molded parts with cores and / or mats therein is possible with a trace-free coating.
  • This object is achieved, according to the invention, by engaging in the cavity of the mold from above and / or below, essentially vertically oriented needle, which are retractable, and which are attached to the front of the core and / or the mat from above and / or brought to the bottom, then the plastic is injected and the needles are withdrawn from the cavity in the pasty state.
  • One of the most important ideas of the present invention is to fix the core or mat to be enclosed by the plastic within the cavity of the mold in the later desired position, to maintain this during the injection of the plastic, but in order to cure it before curing retract while still doughy.
  • the fine openings left in the plastic material by the needles are practically completely closed due to the plasticity of the material.
  • the position in which the core or mat is fixed in the cavity of the mold is basically arbitrary in the context of the invention. It is also not absolutely necessary for the needles to engage in the mold from above and simultaneously from below. For example, needles reaching into the cavity of the mold reach from below when the core or mat sinks downward in the initially still liquid plastic. Similarly, in the event of a tendency to float, needles need to be inserted from the top into the cavity.
  • the number of needles and their spacing from one another is determined and depends on the shape and shape of the cavity. In addition to the number of needles, the weight of the core or mat also determines their respective diameters in order to be able to apply the necessary support forces without problems.
  • the procedure is such that first the mold is opened, the lower needles, if present, are extended into the cavity and the core or mat is placed on top. Then the mold is closed and the upper needles, if present, rest with their end faces against the core or mat from above. The plastic is then introduced in a manner known per se, the needles withdrawn during curing, so that the finished product can be removed from the mold once it has hardened.
  • the advantages of the method according to the invention consist in the fact that the core is coated and insulated from all sides in a single operation. This plastic cover is free of traces and contains no pins or the like. The result is a product with a precisely positioned core or mat, all-round sheathing and a perfect surface.
  • the use of needles of the smallest possible diameter is recommended.
  • An independent closure of the openings is not easy due to the insufficient flowability of the plastic material or due to the material shrinkage. possible, it is recommended by the invention that after the needles have been withdrawn, a certain amount of plastic is injected again, that is to say a so-called reprint. In this way, on the one hand, the missing material is made available that, in a highly flowable state, the openings left behind in the plastic easily close.
  • the needles are not withdrawn too early, that is to say in the case of highly viscous plastic, and not too late when the curing is almost complete.
  • data can be determined empirically, which indicate when the needles should be withdrawn after the injection pressure has taken place.
  • the invention recommends that the temperature of the plastic be recorded in the mold by means of a sensor, from which the course of the curing process can then be followed and read quite exactly.
  • a method for ejecting the finished, ie cured, molded part is carried out proposed the mold in that needles are also arranged to engage in the cavity of the mold from above and / or below, which are retractable and eject the molded part after the hardening and opening of the mold via the needles.
  • the needles that can be inserted and withdrawn in the cavity of the mold are equally available for both processes.
  • a device is described in more detail below which is particularly suitable for carrying out the aforementioned method.
  • a mold and a filling nozzle required for introducing the plastic.
  • essentially vertically aligned needles are arranged which engage in the cavity of the mold, which will later be acted upon by the plastic material, from above and / or below and can be retracted via actuators.
  • the path of movement is measured such that, when extended, the needles protrude into the cavity to a certain depth; in the retracted state, however, the needles disappear completely in the form, so that the cavity is completely free.
  • the extension of the needles can be used to eject the hardened molded part.
  • the needles remain extended until the introduced plastic hardens.
  • the needles are moved via actuators which are controlled from the outside. Leads lead to the outside from the actual actuators that move the needles.
  • the concrete structural design of the actuating members is free within the scope of the invention.
  • the use of hydraulic or pneumatic cylinders, from which to the outside, is considered to be particularly advantageous leading lines and connected to a pump via a control unit are arranged.
  • the needle on each side (top / bottom) can be supplied simultaneously via one and the same line.
  • the cylinders themselves are molded and the needles move in the manner of pistons and piston rods.
  • the hydraulic or pneumatic medium acts on the side of the cylinder opposite the needle.
  • the mold (1) has a filling nozzle (2) and an interior cavity (3) which determines the contour of the molded part to be produced.
  • the shape (1) runs at the level of the cavity (3) and enables the removal of the finished plastic molded part Cutting surface (4) running perpendicular to the plane of the drawing. It also runs from the filling nozzle
  • the needles (6, 7) are guided in the manner of a piston or a piston rod in cylinders (8, 9).
  • the displacement is brought about in that the cylinders (8, 9) in the needle (6, 7) opposite chamber with a hydraulic and pneumatic medium via a supply that supplies all the cylinders (8) located on the top side ⁇ device (10) and a further, the lower cylinder (g) supply line (II) are connected.
  • They are based on a pump (12) that generates an overpressure or underpressure. If the pressure is high, the needles (6, 7) are inserted into the cavity (3) and withdrawn if the pressure is negative.
  • the control takes place in such a way that when the lower needles (7) are extended and the mold (1) is open, the mat (13) is placed on, which is then to be closed, and then the cavity (3) via the filling nozzle (2) is filled with plastic.
  • the dough is still in its
  • the needles (6, 7) are withdrawn completely, additional plastic material may then be injected and the curing awaited. After opening mold (1), the finished molded part can be easily ejected by pushing the needles (6) or (7) forward.
  • the result is a device which, on the one hand, allows the exact positioning of the core or mats inside the molded plastic parts and / or the ejection.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

Dispositif pour produire des préformés en matière synthétique où le moule (1) contient dans sa partie interne une cavité (3) dans laquelle sont agencées des aiguilles (6, 7) qui en dépassent vers le bas et/ou vers le haut et qui peuvent être rétractées depuis l'extérieur au moyen d'organes de commande, par exemple des cylindres (8, 9). Ledit dispositif permet de positionner avec précision des noyaux ou des mats dans des préformés en matière synthétique et/ou d'éjecter le produit fini une fois durci.
PCT/DE1989/000306 1988-05-17 1989-05-13 Procede pour positionner de maniere precise des noyaux et/ou des mats dans des preformes en matiere synthetique WO1989011386A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP3816740.9 1988-05-17
DE19883816740 DE3816740A1 (de) 1988-05-17 1988-05-17 Verfahren zum positionsexakten einbringen von kernen und/oder matten in kunststofformteile

Publications (1)

Publication Number Publication Date
WO1989011386A1 true WO1989011386A1 (fr) 1989-11-30

Family

ID=6354528

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1989/000306 WO1989011386A1 (fr) 1988-05-17 1989-05-13 Procede pour positionner de maniere precise des noyaux et/ou des mats dans des preformes en matiere synthetique

Country Status (2)

Country Link
DE (1) DE3816740A1 (fr)
WO (1) WO1989011386A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4041324A1 (de) * 1989-12-22 1991-06-27 Bosch Siemens Hausgeraete Verfahren zum herstellen von kunststoff-mitnehmern fuer waschmaschinen-trommeln und danach hergesteller mitnehmer
DE4116862A1 (de) * 1991-05-23 1992-11-26 Bosch Siemens Hausgeraete Verfahren zum herstellen von kunststoff-mitnehmern fuer waschmaschinen-trommeln und danach hergestellter mitnehmer
WO2002081170A1 (fr) * 2001-04-06 2002-10-17 Sherwood Services Ag Appareil de maintien de prisonnier surmoule et escamotable
DE102009029820A1 (de) * 2008-08-15 2010-02-18 Volkswagen Ag Verfahren zur Herstellung eines einen Verstärkungseinleger aufweisenden Bauteils und Übergabevorrichtung zum Ablegen eines Verstärkungseinlegers
WO2022031166A3 (fr) * 2020-08-04 2022-03-31 Bambi Belt Holding B.V. Procédé de fabrication d'une courroie de capteur souple, ainsi que partie de moule, agencement de coulée et courroie souple

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB619295A (en) * 1940-05-14 1949-03-07 Eugene Adrien Chapuis Improvements in and relating to the manufacture of injection-moulded reinforced articles made of plastic material
CH576334A5 (fr) * 1975-02-27 1976-06-15 Demag Kunststofftech
GB2103534A (en) * 1981-07-28 1983-02-23 Omron Tateisi Electronics Co Locating inserts during mould filling
JPS59135135A (ja) * 1982-09-10 1984-08-03 Nissei Plastics Ind Co 射出成形による被覆方法
EP0120787A1 (fr) * 1983-03-25 1984-10-03 CERAVER Société anonyme dite: Procédé de moulage du revêtement isolant d'un isolateur électrique organique de grande longueur
FR2556645A1 (fr) * 1983-12-19 1985-06-21 Hager Daniel Procede et dispositif pour injecter une piece de matiere plastique possedant un insert, et pieces ainsi obtenues
JPS60130129A (ja) * 1983-12-16 1985-07-11 Nec Corp 絶縁型半導体素子の樹脂封止方法
JPS60162617A (ja) * 1984-02-03 1985-08-24 Honda Motor Co Ltd 中空成形品の製造方法および装置

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB619295A (en) * 1940-05-14 1949-03-07 Eugene Adrien Chapuis Improvements in and relating to the manufacture of injection-moulded reinforced articles made of plastic material
CH576334A5 (fr) * 1975-02-27 1976-06-15 Demag Kunststofftech
GB2103534A (en) * 1981-07-28 1983-02-23 Omron Tateisi Electronics Co Locating inserts during mould filling
JPS59135135A (ja) * 1982-09-10 1984-08-03 Nissei Plastics Ind Co 射出成形による被覆方法
EP0120787A1 (fr) * 1983-03-25 1984-10-03 CERAVER Société anonyme dite: Procédé de moulage du revêtement isolant d'un isolateur électrique organique de grande longueur
JPS60130129A (ja) * 1983-12-16 1985-07-11 Nec Corp 絶縁型半導体素子の樹脂封止方法
FR2556645A1 (fr) * 1983-12-19 1985-06-21 Hager Daniel Procede et dispositif pour injecter une piece de matiere plastique possedant un insert, et pieces ainsi obtenues
JPS60162617A (ja) * 1984-02-03 1985-08-24 Honda Motor Co Ltd 中空成形品の製造方法および装置

Non-Patent Citations (5)

* Cited by examiner, † Cited by third party
Title
Patent Abstacts of Japan, Band 9, Nr. 288 (E-358)(2011), 15. November 1985; & JP-A-60130129 (NIPPON DENKI K.K.) 11. Juli 1985 *
Patent Abstracts of Japan, Band 6, Nr. 178 (M-155)(1056), 11. September 1982; & JP-A-5787909 (HIDA DENKI K.K.) 1. Juni 1982 *
Patent Abstracts of Japan, Band 7, Nr. 193 (M-238)(1338), 24. August 1983; & JP-A-5894438 (HAYAKAWA GOMU K.K.) 4. Juni 1983 *
Patent Abstracts of Japan, Band 8, Nr. 263 (M-342)(1700), 4. Dezember 1984; & JP-A-59135135 (NITSUSEI JIYUSHI KOGYO K.K.) 3. August 1984 *
Patent Abstracts of Japan, Band 9, Nr. 330 (M-442)(2053), 25. Dezember; & JP-A-60162617 (HONDA GIKEN KOGYO K.K.) 24. August 1985 *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4041324A1 (de) * 1989-12-22 1991-06-27 Bosch Siemens Hausgeraete Verfahren zum herstellen von kunststoff-mitnehmern fuer waschmaschinen-trommeln und danach hergesteller mitnehmer
DE4116862A1 (de) * 1991-05-23 1992-11-26 Bosch Siemens Hausgeraete Verfahren zum herstellen von kunststoff-mitnehmern fuer waschmaschinen-trommeln und danach hergestellter mitnehmer
WO2002081170A1 (fr) * 2001-04-06 2002-10-17 Sherwood Services Ag Appareil de maintien de prisonnier surmoule et escamotable
DE102009029820A1 (de) * 2008-08-15 2010-02-18 Volkswagen Ag Verfahren zur Herstellung eines einen Verstärkungseinleger aufweisenden Bauteils und Übergabevorrichtung zum Ablegen eines Verstärkungseinlegers
DE102009029820B4 (de) * 2008-08-15 2019-06-27 Volkswagen Ag Übergabevorrichtung zum Ablegen eines Verstärkungseinlegers
WO2022031166A3 (fr) * 2020-08-04 2022-03-31 Bambi Belt Holding B.V. Procédé de fabrication d'une courroie de capteur souple, ainsi que partie de moule, agencement de coulée et courroie souple
NL2026206B1 (en) * 2020-08-04 2022-04-08 Bambi Belt Holding B V Method of manufacturing a flexible sensor belt, as well as a mould part, a casting arrangement and a flexible belt.

Also Published As

Publication number Publication date
DE3816740A1 (de) 1989-11-30

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