EP1073549A1 - Piece moulee par compression constituee d'un mat de fibres de verre et de matiere plastique - Google Patents

Piece moulee par compression constituee d'un mat de fibres de verre et de matiere plastique

Info

Publication number
EP1073549A1
EP1073549A1 EP00904957A EP00904957A EP1073549A1 EP 1073549 A1 EP1073549 A1 EP 1073549A1 EP 00904957 A EP00904957 A EP 00904957A EP 00904957 A EP00904957 A EP 00904957A EP 1073549 A1 EP1073549 A1 EP 1073549A1
Authority
EP
European Patent Office
Prior art keywords
main body
cavity
component
soft polymer
edges
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.)
Withdrawn
Application number
EP00904957A
Other languages
German (de)
English (en)
Inventor
Alfred Scharrenberg
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.)
Otto Deuschle Modell und Formenbau GmbH and Co KG
Original Assignee
Otto Deuschle Modell und Formenbau GmbH and Co KG
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 Otto Deuschle Modell und Formenbau GmbH and Co KG filed Critical Otto Deuschle Modell und Formenbau GmbH and Co KG
Publication of EP1073549A1 publication Critical patent/EP1073549A1/fr
Withdrawn legal-status Critical Current

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
    • B29C45/14336—Coating a portion of the article, e.g. the edge of the article
    • 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
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/28—Shaping operations therefor
    • B29C70/40—Shaping or impregnating by compression not applied
    • B29C70/42—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles
    • B29C70/46—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using matched moulds, e.g. for deforming sheet moulding compounds [SMC] or prepregs
    • B29C70/461—Rigid movable compressing mould parts acting independently from opening or closing action of the main mould
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/14336—Coating a portion of the article, e.g. the edge of the article
    • B29C2045/14459—Coating a portion of the article, e.g. the edge of the article injecting seal elements
    • 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
    • B29C45/14778—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 the article consisting of a material with particular properties, e.g. porous, brittle
    • B29C45/14786—Fibrous material or fibre containing material, e.g. fibre mats or fibre reinforced material
    • 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
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/28—Shaping operations therefor
    • B29C70/40—Shaping or impregnating by compression not applied
    • B29C70/42—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles
    • B29C70/46—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using matched moulds, e.g. for deforming sheet moulding compounds [SMC] or prepregs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/30—Vehicles, e.g. ships or aircraft, or body parts thereof
    • B29L2031/3005—Body finishings

Definitions

  • the invention relates to a GMT plastic pressed part with a main body, which consists of a glass fiber blank cut soaked with a thermoplastic, pressed and hardened in the form, and with at least one component fastened to the main body made of a soft polymer, and a method and a device for producing such.
  • GMT plastic pressed parts are understood to mean those plastic molded parts which are produced in the so-called "GMT press process".
  • a glass fiber mat impregnated with a thermoplastic is inserted into a steel mold, which has a female die and a male die movable with respect to the female die using a conventional press.
  • Die and patrix limit a cavity, the shape of which corresponds to the desired shape of the GMT plastic press part.
  • the cavity is delimited by plunge edges made of hardened material, which are formed on the female and male. After a corresponding cooling in the mold, the GMT pressed part can be removed. Because of the high long-fiber glass fiber content, such a GMT pressed part is very dimensionally stable, robust and also recyclable without costly ribbing.
  • the object of the present invention is to provide a GMT plastic pressed part of the type mentioned at the outset which is inexpensive to produce and has a good connection between the "main body” and the component made of soft polymer.
  • This object is achieved in that the component made of soft polymer is injection molded onto the main body.
  • GMT plastic pressed parts according to the invention can be produced very inexpensively in a single mold. Despite the different manufacturing processes that are carried out in this single mold, the cycle times that can be achieved are comparable to the cycle times of pure molded parts and can sometimes be undercut. The production can be run fully automatically. Since the two-component materials meet relatively hot, they can form a good bond. The cooling times can be in relatively good harmony with one another.
  • the connection area between the soft polymer component and the main body is increased by a gradation.
  • a gradation particularly in the case of thin wall thicknesses of the GMT plastic pressed part, such an embodiment has proven very successful in order to achieve a good fusion connection.
  • a reinforcing bead along the hard-soft connection of the pressed part may be necessary; However, this can be arranged on the respectively invisible surface of the GMT plastic pressed part and does not interfere there.
  • the invention also has the task of creating a method for producing a GMT plastic pressed part which is inexpensive to carry out and results in highly stable connections between the main body and the soft component.
  • the die has at least one second mold recess which, in the closed position of the mold, partially delimits a second cavity which is complementary to the mold of a soft polymer component of the GMT plastic pressed part;
  • the patrix has at least one second mold recess, which partially delimits the second cavity in the closed position of the mold;
  • At least one closing knife slide is arranged along the common edges of the two cavities, which is between a first position in which it
  • the areas of the edges of the second cavity which are not formed by the closing knife slide are formed by hardened plunge edges on the male and female molds, between which there is a defined gap which is narrower than the gap between the plunge edges delimiting the first cavity;
  • At least one injection nozzle opening into the second cavity is provided.
  • the particular advantage of such a device according to the invention is that the molding tool can be installed in a normal press. Costs for the production of a special machine are therefore eliminated. A separate, also a decommissioned, injection unit can simply be docked to the press. All work steps of the method according to the invention can then be carried out in this one station, which considerably reduces the manufacturing outlay in the production of the GMT plastic pressed part.
  • the closing knife slide provided according to the invention, the free spaces for the component made of soft polymer can be opened during the hardening phase of the main body shortly after the mold has been closed, for example about 5 seconds after the mold has been closed, and thus the requirements for the injection molding process Create a component from soft polymer.
  • a particular problem in the manufacture of the GMT plastic press part is the plunge edges on the female and male dies, which at least in some areas limit both the cavity for the manufacture of the main body and the cavity for the manufacture of the soft polymer component in the mold.
  • Vertical plunge edges cannot be sealed 100%. Due to the constant sliding of the male and female into the female, an air gap of at least 0.035 to 0.05 mm is required. A smaller air gap would inevitably lead to the diving edges eating.
  • the hardened plunge edges are useful in the pressing processes up to one
  • Gap size from 0.07 to 0.15 mm.
  • the molding compound, from which the component is made of soft polymer is, however, very thin and already escapes through gaps that are only 0.015 to 0.02 mm wide. Such an escape leads to poor melt connections and strong burr formation.
  • care must therefore be taken that the plunge edges, which delimit the second cavity forming the soft component of the GMT plastic pressed part, with a very small gap face each other, which is smaller than the gap between the plunge edges in the region of the first cavity forming the main body of the GMT plastic pressed part.
  • the power source used according to the invention in this configuration is only activated when the male part is stationary in the closed position of the molding tool, the liquid spray compound is to be injected and the plunge edges must therefore remain at the desired distance from one another. This distance is always reliably found by the stop between the outer slide and the mold when the power source is actuated.
  • the power source can comprise a wedge slide whose direction of movement is not parallel to the direction of movement of the outer slide and that with the outer slide interacts via cam surfaces. This configuration of the power source works particularly precisely and is able to apply high forces to the outer slide and, conversely, to absorb high reaction forces via the outer slide.
  • At least one plunge edge delimiting the second cavity can be formed on a wear strip. If the very small gap between the corresponding plunge edges has increased inadmissibly, the corresponding wear strip can simply be replaced.
  • Figure 1 the perspective view of a GMT plastic press part with molded sealing lips
  • FIG. 2 a vertical section through the molding tool for producing the GMT plastic pressed part from FIG. 1;
  • FIG. 3 an enlarged detail of the molding tool from FIG. 2;
  • FIG. 4 a top view of the die mold half of the molding tool of FIGS. 1 and 2;
  • FIGs 5 and 6 detailed enlargements of the mold of Figures 1 to 4 in different stages of the manufacturing process of the GMT plastic press part;
  • FIG. 7 shows a section through the edge region of the GMT plastic pressed part from FIG. 1.
  • FIG. 1 shows a finished GMT plastic press part 1, as used in the automotive industry. It comprises a main body 2, which consists of a thermoplastic-impregnated glass fiber blank blank pressed in the manner described in more detail below.
  • the further precise shaping of the GMT plastic molded part 1 is of no importance in the present context.
  • FIG. 2 shows a vertical section through the molding tool 5, which is used to manufacture the GMT plastic pressed part 1 shown in FIG.
  • the molding tool 5 comprises, in a manner known per se, an upper molding tool half 6, hereinafter referred to as "patrix", and a lower mold half 7 cooperating with it, hereinafter referred to as "die”.
  • Those areas of the cavity 8 which do not correspond to edge areas of the GMT plastic pressed part 1 provided with sealing lips 3, 4 are delimited by cooperating plunge edges 11, 13 on the die 7 or die 6, which are made of hardened material in a known manner and when The die 7 and the patrix 6 close to one another with such a play that seizure is avoided and air can escape from the cavity 8.
  • the gap is typically about 0.035 to 0.05 mm. Wear can occur up to about 0.07 to 0.15 mm.
  • the cavity 8 is limited or can be limited by closing knife slides 14, one of which is shown in the drawing.
  • the closing knife slide 14 is arranged within a corresponding recess in the male part 6 and can be moved vertically between an extended and a retracted position by means of a hydraulic cylinder 15. In the extended position, which is shown enlarged in FIG. 5, its end face rests on the opposite surface of the die 7, while in the retracted position shown in FIG. 6, the end face of the closing knife slide 14 is moved back flush with the adjacent components and the connection releases between cavities 8 and 9.
  • the cavities 9 are delimited at those edges which correspond to the free edges of the sealing lips 3 and 4 of the GMT plastic pressed part from FIG. 1 by plunge edges 17, 19, one of which (17) on one inside the Male 6 provided wear bar 16 and the other is arranged on an outer slide 18 assigned to the die 7.
  • the outer slide 18 is movable in the horizontal direction. It is guided by guide strips 28, in which it engages in a form-fitting manner.
  • the movement of the outer slide 18 takes place via a closing wedge slide 20 which can be displaced with the aid of a hydraulic cylinder 21 (see FIG. 4) in a direction which is perpendicular to the desired direction of displacement of the outer slide 18.
  • This construction has the advantage, compared to actuation via a direct-acting hydraulic cylinder, that greater precision is possible when the outer slide 18 moves and that larger forces can also be transmitted and absorbed.
  • Injection nozzles 22 open into the cavities 9, which extend through the die 7 and are supplied by a heating duct 23 with the plastic used to produce the sealing lips 3, 4.
  • a groove 40 (see FIG. 3) is formed in the end face of the outer slide 18 facing the cavity 8, the side walls of which converge in the direction of the bottom of the groove 40.
  • a rib 41 of the die 7 engages in this groove 40 of the outer slide 18 and has inclined stop surfaces complementary to the side walls of the groove 40.
  • the side walls of the groove 40 of the outer slide 18 bear against the stop surfaces of the rib 41 of the die 7.
  • this stop position there is a desired, minimum distance between the plunge edges 17, 19 on the outer slide 18 or the wear strip 16, in which the air can escape from the cavity 9.
  • this gap is kept so small that even the low-viscosity material injected into the cavity 9 no longer escapes through the gap between the plunge edges 17 and 19 and can form undesirable burrs or beards.
  • the die 7 is supported by spacer bars 33 from a large platen 34, which in turn is attached to the stationary part of a conventional press, not shown, via an insulating protection plate 35 and steel protection plate 36. Cooling holes 38 also run through the die 7 in a known manner.
  • An ejector 30 connected to an ejector plate 31 also extends through bores in the die 7 and serves to eject the finished GMT plastic press part 1.
  • the male 6 is fastened to a mounting plate 42, which in turn is mounted on the movable part of the press already mentioned.
  • Hydraulic channels 37 run through the mounting plate 42 and serve to feed the hydraulic cylinders 15 with which the closing knife slides 14 are moved.
  • small spacer strips 32 ( Figure 2) and 25 ( Figure 4) are also shown, which are attached to the mounting plate 42 or on the edge region of the die 7 and with which the distance between the die 6 and die 7 in the closed position of the Press is precisely defined.
  • Guide strips 29 on male 6 and female 7, which run parallel to the corresponding plunge edges 11 and 13, serve to pre-center male 6 and female 7 during the closing process.
  • the two mold halves are also provided with guides 24 (see FIG. 4), with the aid of which a defined rela- active movement is possible.
  • the device described above works for the production of the GMT plastic pressed part 1 shown in FIG. 1 as follows:
  • a glass fiber mat blank is now inserted from above into that area of the mold recess in the die 7 which, when the mold 5 is closed, delimits the cavity 8 on one side.
  • the glass fiber mat blank is impregnated with hot, liquid thermoplastic.
  • the molding tool 5 is closed with the help of the press, not shown, the hydraulic cylinder 21 remaining powerless.
  • the male 6 moves along the plunge edges 11, 13, 17, 19 into the female 7.
  • the end face of the closing knife slide 14 hits the opposite face of the male part 7, the cavity 8 is closed.
  • thermoplastic-impregnated glass fiber mat blank is now pressed into the final shape. During this further movement of the patrix
  • the closing knife slides 14 are brought into the retracted position shown in FIG. 6 with the aid of the hydraulic cylinders 15.
  • the hydraulic cylinder 21 is actuated, moves the outer slide 18 against the die 7 and holds the outer slide 18 under force in this position in which the required small gap between the plunge edges 17 and 19 is established.
  • the outer slide 18 has the following relationship:
  • the end face of the closing knife slide 14 is not designed to be flat, but stepped. This end face lies only against the corresponding surface of the die 7 via a relatively narrow “cutting edge” 43, which is adjacent to the cavity 9. This achieves the following:
  • the edge area adjacent to the locking knife slides 14 is formed in a step-like manner which is complementary to the step shape of the end face of the locking knife slide 14.
  • the stepped edge contour 44 of the main parts 2 thus formed is overmolded, so that there is a large connecting surface between the molded sealing lip 3, 4 and the main part 2 (see FIG. 7).
  • the strength of the connection between the main part 2 and the sealing lips 3, 4 of the GMT plastic press part 1 is improved.

Landscapes

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

Abstract

L'invention concerne une pièce moulée par compression (1) constituée d'un mat de fibres de verre et de matière plastique, qui comprend un corps principal (2) constitué, de façon connue en soi, d'une découpe de mat de fibres de verre imprégnée d'une matière thermoplastique, moulée par compression dans un moule et durcie. Dans au moins une zone du bord de ce corps principal (2), un composant (3, 4) constitué d'un polymère mou, par exemple une lèvre d'étanchéité, est moulé directement par injection.
EP00904957A 1999-02-22 2000-01-24 Piece moulee par compression constituee d'un mat de fibres de verre et de matiere plastique Withdrawn EP1073549A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19907439 1999-02-22
DE19907439A DE19907439C2 (de) 1999-02-22 1999-02-22 GMT-Kunststoff-Preßteil sowie Verfahren und Vorrichtung zur Herstellung eines solchen
PCT/EP2000/000526 WO2000050211A1 (fr) 1999-02-22 2000-01-24 Piece moulee par compression constituee d'un mat de fibres de verre et de matiere plastique

Publications (1)

Publication Number Publication Date
EP1073549A1 true EP1073549A1 (fr) 2001-02-07

Family

ID=7898360

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00904957A Withdrawn EP1073549A1 (fr) 1999-02-22 2000-01-24 Piece moulee par compression constituee d'un mat de fibres de verre et de matiere plastique

Country Status (4)

Country Link
EP (1) EP1073549A1 (fr)
CA (1) CA2329747A1 (fr)
DE (1) DE19907439C2 (fr)
WO (1) WO2000050211A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10227636A1 (de) * 2002-06-21 2004-01-15 Krauss-Maffei Kunststofftechnik Gmbh Verfahren und Vorrichtung zum Herstellen mehrkomponentiger Kunststoff-Formteile
DE10320331A1 (de) * 2003-05-06 2004-11-25 Rkt Kunststoffe Gmbh Verfahren zur Herstellung eines Kunststoffbauteiles mit einem Einlieger sowie nach diesem Verfahren hergestelltes Bauteil
DE102004046096B3 (de) * 2004-09-23 2006-05-24 Daimlerchrysler Ag Kantenversiegelung an Kunststoffbauteilen durch Aufdrucken
DE102009040901B4 (de) * 2009-09-11 2022-02-24 Brose Fahrzeugteile SE & Co. Kommanditgesellschaft, Coburg Verfahren zum Herstellen von Tragstrukturen in Kraftfahrzeugen
FR3027857B1 (fr) * 2014-10-29 2016-12-30 Centre D'etude Et De Rech Pour L'automobile (Cera) Element de garnissage de vehicule automobile
DE102016209183A1 (de) * 2016-05-26 2017-11-30 Faurecia Innenraum Systeme Gmbh Verfahren zur Herstellung eines Fahrzeuginnenverkleidungsteils und Formwerkzeug
US20240140880A1 (en) * 2022-10-31 2024-05-02 Rohr, Inc. Expandable male die bladder for match die shape-forming systems and methods

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3511954C2 (de) * 1985-04-02 1993-10-28 Polynorm Bv Verfahren und Vorrichtung zur Herstellung von Formpreßteilen, die an mindestens einem Rand mit einem thermoplastischen Randstreifen, insbesondere einer Dichtlippe od.dgl. verbunden sind
DE4443145C1 (de) * 1994-12-05 1996-03-21 Seeber Systemtechnik Kg Verfahren und Vorrichtung zur Beschichtung warm verformter thermoplastischer Bauteile mit thermoplastischen Oberflächenmaterialien

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0050211A1 *

Also Published As

Publication number Publication date
DE19907439C2 (de) 2001-02-22
WO2000050211A1 (fr) 2000-08-31
CA2329747A1 (fr) 2000-08-31
DE19907439A1 (de) 2000-08-31

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