EP0712351A1 - Procede de fabrication d'une piece moulee en matiere thermoplastique - Google Patents

Procede de fabrication d'une piece moulee en matiere thermoplastique

Info

Publication number
EP0712351A1
EP0712351A1 EP94925393A EP94925393A EP0712351A1 EP 0712351 A1 EP0712351 A1 EP 0712351A1 EP 94925393 A EP94925393 A EP 94925393A EP 94925393 A EP94925393 A EP 94925393A EP 0712351 A1 EP0712351 A1 EP 0712351A1
Authority
EP
European Patent Office
Prior art keywords
membrane
shaping
soft
molded part
mold
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Withdrawn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
EP94925393A
Other languages
German (de)
English (en)
Inventor
Herbert K.F. Börger
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0712351A1 publication Critical patent/EP0712351A1/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Withdrawn legal-status Critical Current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
    • B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
    • B29C51/08—Deep drawing or matched-mould forming, i.e. using mechanical means only
    • B29C51/082—Deep drawing or matched-mould forming, i.e. using mechanical means only by shaping between complementary mould parts
    • B29C51/085—Deep drawing or matched-mould forming, i.e. using mechanical means only by shaping between complementary mould parts with at least one of the shaping surfaces being made of resilien material, e.g. rubber
    • 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
    • B29C70/30—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
    • B29C70/34—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation
    • B29C70/342—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation using isostatic pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2101/00—Use of unspecified macromolecular compounds as moulding material
    • B29K2101/12—Thermoplastic materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
    • B29K2105/08—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts of continuous length, e.g. cords, rovings, mats, fabrics, strands or yarns
    • B29K2105/10—Cords, strands or rovings, e.g. oriented cords, strands or rovings
    • 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
    • B29L2031/48—Wearing apparel
    • B29L2031/4807—Headwear
    • B29L2031/4814—Hats
    • B29L2031/4821—Helmets

Definitions

  • the invention relates to a method for producing a molded part, wherein a plate made of thermoplastic with at least one reinforcing layer made of fabric, fleece, knitted fabric, scrim, braid or the like, which is introduced into the plastic matrix. is heated to a temperature in the region of the melting point of the thermoplastic and is deformed by means of a female and male mold.
  • a method of the generic type has the advantage that the hardening of the heated thermoplastic material alone the cooling takes place on the mold wall and accordingly the demolding can take place directly after the shaping and accordingly very short cycle times can be achieved for industrial production.
  • a certain disadvantage of the known method is that locally different wall thicknesses can form, although it is assumed that a plate-shaped semi-finished product of exactly constant thickness.
  • the different wall thicknesses are caused, for example, by the fact that when the reinforcing layers are draped, e.g. in the form of a fabric, zones of increased fiber density are created by strong shearing of the fiber strands against one another. This is the case with molded parts with a visible side, e.g. the outside of a safety helmet, not acceptable.
  • thermoplastics since these have only a low flowability due to the large molecular length in the plate plane, so that the degradation of local thickenings or the compensation of local wall thickness reductions is made considerably more difficult, for example in the case of Due to the initially shorter molecular length, thermoset composites have better flowability and accordingly an easier leveling in the plane is possible.
  • the surface is poorly formed in the case of a complex molded part shape with strong curvatures, since the pressure is lower on narrow radii and edges and it can even happen that the reinforcing fibers press into the soft stamp mass and migrate out of the intended position .
  • the object of the invention is to develop a method of the type mentioned at the outset such that a high, uniform surface quality which does not require any aftertreatment is achieved with rational production.
  • a pressure-soft membrane is arranged on the plastic plate at least on one side, at least during the shaping process.
  • the membrane is preferably arranged on the side opposite the visible surface of the finished molded part. It is conveniently subtracted after shaping. As an alternative to this, it can also be provided that the membrane remains integrated in the molded part wall after shaping and remains there as a cushioning, shock-absorbing or sound-absorbing layer and / or as a layer which fulfills a decorative function.
  • the method according to the invention favors the compensation of local increases in layer thickness or, in general, deviations in layer thickness, so that surfaces, in particular on the visible side, have a very uniform, high-quality appearance. Particularly in the case of strongly inclined molded part areas, a uniformly high material compression with high precision of the geometries and fabric positioning is achieved.
  • the manufacturing costs for the mold are reduced due to the lower accuracy requirements for the two hard mold surfaces.
  • the running-in time of the tool can be reduced since the retouching work on the surfaces of the mold halves is reduced or is completely eliminated.
  • thermoplastic plastic matrix is initially protected against very rapid cooling upon first contact with the not yet compressed membrane. Only after the full pressing pressure has built up and thus extensive compression of the membrane, which was originally, for example, 2 to 5 mm thick to a thickness of, for example, 3/10 mm, can the heat be conducted very quickly via the then almost compact material to the temperature-controlled tool .
  • the membrane used advantageously has a compressibility> 90% in the direction perpendicular to the membrane plane.
  • the membrane advantageously consists of a cross-linked, foamed polymer material, since this is the best way to achieve the required properties.
  • an open-cell, foamed polymer material also has the advantage that the enclosed gas quickly during the compression process due to the open-cell nature of the foam structure can escape.
  • the channels between the mold surface and the composite material due to the open-cell foam structure also facilitate the escape of air that may be trapped in recessed areas of the mold cavity in the course of the mold closing process until direct mold contact.
  • the membrane can be made of an open-cell foam made of polyurethane in a soft or semi-hard setting, polyurea, silicone rubber, cellular rubber or the like. consist.
  • the membrane made of a foam made of high-temperature thermoplastics such as PMMI, PES or the like. exists.
  • a membrane is relatively rigid and is partially plastically deformed during the shaping process.
  • the membrane consists of a highly compressible, elastically behaving textile surface element, which is approximately velor-like and can be compressed accordingly.
  • the membrane extends into the area of a hold-down device usually provided in such processes, i.e. a retaining ring surrounding the actual shape recess, which is intended to ensure orderly draping of the reinforcing layer.
  • a hold-down device usually provided in such processes, i.e. a retaining ring surrounding the actual shape recess, which is intended to ensure orderly draping of the reinforcing layer.
  • the pressure distribution can advantageously develop due to the membrane.
  • 1 shows a schematic section through part of a mold which is not completely closed
  • 2 shows a representation to illustrate local differences in the surface quality due to tolerances in the gap between the mold halves
  • FIG. 3 shows a representation of a deformable membrane introduced on one side with the mold still partially open
  • FIG. 7 shows a representation corresponding to FIG. 6 when the tool is open and when using a preformed membrane
  • Fig. 8 is a schematic representation of the supply of a soft membrane.
  • FIG. 1 shows a schematic section through a mold used in the method according to the invention, which comprises a female mold and a male mold or a punch, with channels for a temperature control means, ie for heating or cooling, being provided in both molded parts are.
  • a layer made of a composite material, that is to say a thermoplastic provided with at least one reinforcing layer, and a membrane according to the invention are arranged in the shape which is not yet completely closed in the drawing.
  • the membrane shown is a relatively soft membrane.
  • the gap thickness d downwards due to local differences in the surface quality (- d) can deviate, a reduction in the gap thickness due to shape defects leading to increased compression and partial displacement of the matrix during the shaping process and a partially increased gap width to a poor surface due to the lack of compression of the finished molding.
  • FIG. 5 shows, for example with the aid of a helmet shape, how the shape retention force acts locally differently. It becomes clear that in the area of the pole of the helmet to be manufactured, i.e. The full mold locking force Z is effective at its uppermost position, while in the area of the lower edge, where the mold locking force Z extends at an acute angle to the mold surfaces, there are far more unfavorable conditions.
  • Fig. 6 shows the conditions when using a relatively thick, hard membrane, for example made of hard foam. Areas of plastic, large-area deformation of the rigid foam can be seen, where the gap width is reduced due to shape errors. In contrast, Chen increased gap width an improved pressure due to the initially available initial thickness of the foam.
  • a soft membrane preform is used, which then lies, for example, over the stamp, whereas only then does the composite plate, pressed by a known hold-down device, by means of the second mold half, ie the die, is deformed, so that the membrane is already in a molded state against a mold half during the molding process.
  • FIG. 8 schematically shows a possibility of feeding the membrane, the membrane being rolled off from the roller on the left in the drawing, under which the composite plate inserted in the mold comes to rest, and from a roller on the right in the drawing ⁇ is pulled, a section of the membrane being punched out by closing the mold.

Landscapes

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

Abstract

Selon un procédé de fabrication d'une pièce moulée, une plaque en matière thermoplastique qui contient dans sa matrice en matière plastique une couche de renforcement en un tissu tissé, non-tissé, tricoté, inséré, tressé ou similaire est chauffée jusqu'à une température dans la plage du point de fusion de la matière thermoplastique, puis façonnée au moyen d'une matrice inférieure et d'un moule mâle. Afin d'obtenir par un procédé rationnel de fabrication une surface d'une qualité élevée homogène qui ne requiert pas de traitement ultérieur, une membrane souple qui se déforme fortement sous l'effet de la pression est placée sur au moins une face de la plaque en matière plastique pendant au moins le processus de façonnage.
EP94925393A 1993-07-29 1994-07-26 Procede de fabrication d'une piece moulee en matiere thermoplastique Withdrawn EP0712351A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19934325488 DE4325488A1 (de) 1993-07-29 1993-07-29 Verfahren zur Herstellung eines Formteils aus thermoplastischem Kunststoff
DE4325488 1993-07-29
PCT/EP1994/002464 WO1995003933A1 (fr) 1993-07-29 1994-07-26 Procede de fabrication d'une piece moulee en matiere thermoplastique

Publications (1)

Publication Number Publication Date
EP0712351A1 true EP0712351A1 (fr) 1996-05-22

Family

ID=6494010

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94925393A Withdrawn EP0712351A1 (fr) 1993-07-29 1994-07-26 Procede de fabrication d'une piece moulee en matiere thermoplastique

Country Status (3)

Country Link
EP (1) EP0712351A1 (fr)
DE (1) DE4325488A1 (fr)
WO (1) WO1995003933A1 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5529480A (en) * 1994-10-28 1996-06-25 The Boeing Company Honeycomb core forming restricter
DE19625786B4 (de) * 1995-07-08 2008-10-02 Volkswagen Ag Seitenverkleidung für ein Kraftfahrzeug
US5780074A (en) * 1995-10-16 1998-07-14 The Boeing Company Apparatus for shaping honeycomb core
DE19652517A1 (de) * 1996-11-12 1997-06-12 Inst Verbundwerkstoffe Gmbh Verfahren zur Herstellung dünnwandiger, kontinuierlich faserverstärkter Thermoplast-Faserteile
DE19829352C2 (de) * 1998-07-01 2002-10-24 Daimler Chrysler Ag Verfahren zur Herstellung eines dreidimensionalen Formkörpers
US6186766B1 (en) 1998-10-29 2001-02-13 The Boeing Company Apparatus for shaping honeycomb core
DE102010022169A1 (de) * 2010-05-20 2011-11-24 Faurecia Innenraum Systeme Gmbh Vorrichtung zum Thermoformen von Kunststofffolien
DE102011054703B4 (de) * 2011-10-21 2015-01-15 Benteler Sgl Gmbh & Co. Kg Verfahren zur Herstellung von Preforms zur Weiterverarbeitung zu Faserverbundbauteilen
DE102014000024B4 (de) * 2014-01-03 2018-01-18 Lisa Dräxlmaier GmbH Verdichtung von Naturfasermatten mittels elastischer Formhilfen

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1437351A (en) * 1972-11-28 1976-05-26 Ici Ltd Method for embissing thermoplstic sheet
FR2424815A1 (fr) * 1978-05-04 1979-11-30 Honda Motor Co Ltd Procede de fabrication d'un tableau de bord
IT1126638B (it) * 1979-12-20 1986-05-21 Pier Luigi Nava Procedimento e relativo utensile per stampare manufatti in resina armata
DE3145698A1 (de) * 1981-11-19 1983-05-26 Messerschmitt-Bölkow-Blohm GmbH, 8000 München Vorrichtung zum fertigen von bauteilen aus faserverstaerkten werkstoffen
US4473208A (en) * 1982-05-24 1984-09-25 Nava Pier Luigi Apparatus for making helmets
GB2160467B (en) * 1984-06-22 1987-09-23 Rolls Royce Moulding of composite materials
SU1435475A2 (ru) * 1986-03-04 1988-11-07 Центральный Научно-Исследовательский Институт Геодезии,Аэросъемки И Картографии Им.Ф.Н.Красовского Способ изготовлени глобусов из листового термопластичного материала
US4946640A (en) * 1989-04-17 1990-08-07 Shell Oil Company Method for forming preformed material
JP2765981B2 (ja) * 1989-08-28 1998-06-18 富士重工業株式会社 複合材の折曲成形方法および折曲成形装置
US5145621A (en) * 1990-04-20 1992-09-08 General Electric Company Crossover mold tool for consolidating composite material

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9503933A1 *

Also Published As

Publication number Publication date
WO1995003933A1 (fr) 1995-02-09
DE4325488A1 (de) 1995-02-02

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