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WO2009027019A1 - Fabrication de pièces en plastique par déformation - Google Patents

Fabrication de pièces en plastique par déformation Download PDF

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Publication number
WO2009027019A1
WO2009027019A1 PCT/EP2008/006683 EP2008006683W WO2009027019A1 WO 2009027019 A1 WO2009027019 A1 WO 2009027019A1 EP 2008006683 W EP2008006683 W EP 2008006683W WO 2009027019 A1 WO2009027019 A1 WO 2009027019A1
Authority
WO
WIPO (PCT)
Prior art keywords
polymer material
polymer
temperature
less
materials
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.)
Ceased
Application number
PCT/EP2008/006683
Other languages
German (de)
English (en)
Inventor
Michael Schlipf
Claudia Stern
Achim Frick
Arif Rochman
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.)
ElringKlinger AG
Original Assignee
ElringKlinger AG
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 ElringKlinger AG filed Critical ElringKlinger AG
Publication of WO2009027019A1 publication Critical patent/WO2009027019A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
    • 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
    • B29K2027/00—Use of polyvinylhalogenides or derivatives thereof as moulding material
    • B29K2027/12—Use of polyvinylhalogenides or derivatives thereof as moulding material containing fluorine
    • 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
    • B29K2027/00—Use of polyvinylhalogenides or derivatives thereof as moulding material
    • B29K2027/12—Use of polyvinylhalogenides or derivatives thereof as moulding material containing fluorine
    • B29K2027/18—PTFE, i.e. polytetrafluorethene, e.g. ePTFE, i.e. expanded polytetrafluorethene
    • 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

Definitions

  • the present invention relates to a process for the production of plastic moldings from a room temperature amorphous or partially crystalline partially or fully fluorinated thermoplastic polymer material using a press mold with a punch and a counterpart corresponding to the stamp with a recess for receiving polymer material and the stamp, wherein the Stamp and the corresponding counterpart in an arrangement of the punch in a predetermined end position define a cavity whose shape corresponds substantially to the shape of the molded part to be produced.
  • the invention further relates to a molded part produced or producible according to such a method.
  • thermoforming processes For the production of molded parts from plastics, a whole series of processes are known from the prior art, in particular primary molding processes such as injection molding or reaction injection molding (RIM) and forming processes, in particular thermoforming processes.
  • primary molding processes such as injection molding or reaction injection molding (RIM)
  • forming processes in particular thermoforming processes.
  • a polymer material is plasticized and injected into an injection mold.
  • the shape and surface structure of the molded part to be produced are determined by the cavity of the injection mold into which the plasticized material is injected.
  • Even small parts, also called microform parts, with a weight of well below 1 g can be easily produced by injection molding.
  • a disadvantage however, the possible formation of weld lines and the mandatory sprue, which produces a percentage of waste, especially in the production of small moldings percentage.
  • problems occur in the processing of polymers with high viscosity, especially at high flow path wall thickness ratio. Above a certain molecular weight, many polymers are no longer processable by injection molding. Many of these disadvantages also occur in reaction injection molding.
  • reaction masses are mixed together and immediately injected as a reaction mass into a molding tool.
  • reaction masses generally have a more favorable flow behavior, which is why larger flow paths can be achieved with the same wall thickness.
  • the mold life may be slightly higher than in the competitive injection molding.
  • MEMS microelectromechanical systems
  • MST microsystem technology
  • thermoforming processes are, in particular, thermoforming and vacuum deep drawing processes. In these processes, films or thin plates are usually processed. Other semi-finished products are usually not usable as starting materials. As a result, usually only molded parts with almost homogeneous wall thickness can be produced.
  • the object of the present invention is to provide a new process for the production of molded plastic parts, which does not have the disadvantages of the known from the prior art method.
  • plastic molding according to claim 18 is the subject of the present invention.
  • Preferred embodiments of the plastic molding according to the invention can be found in the dependent claims 19 to 23. The wording of all claims is hereby incorporated by reference into the content of this specification.
  • An inventive method is particularly suitable for the production of moldings, in particular micro-components, with sub-areas with significantly different wall thicknesses, including very thin-walled areas which have a thickness of about 500 microns or less at least in a partial area.
  • the inventive method is suitable for the production of molded parts with complex geometry.
  • the method according to the invention allows the production of essentially distortion-free molded parts, since at most slight pressure differences prevail within the cavity. This advantage is above all compared with the molded parts produced by extrusion molding.
  • the method according to the invention further provides molded parts with a substantially homogeneous morphology over the molded part cross-section. This results in homogeneous usage properties.
  • the process of the invention presents itself as a largely waste-free production process. This is of particular importance in the case of high-priced polymer materials, since waste recycling does not always succeed without sacrificing quality.
  • thermo-oxidative stress of the polymer materials used can be further reduced by an inert gas purging of the press-forming tool.
  • the processing temperatures for the polymer material used can be set lower in comparison with the methods described above. Furthermore, the method according to the invention has virtually no venting problem.
  • the method according to the invention can be designed relatively independently of the wall thickness / flow path ratio.
  • the process according to the invention can be used to process thermoplastic polymer materials which have high molar masses and are unsatisfactory or can not be processed at all using conventional processes.
  • the polymer materials may well have molecular weights that reach up to about 10 8 g / mol.
  • solid polymer material is introduced into the recess.
  • the solid polymer material is introduced into the recess in an amount corresponding to the weight of the molded part to be produced.
  • the polymer material is heated until it reaches a thermoelastic state.
  • the glass transition temperature is the temperature at which amorphous or partially crystalline polymers transition from the hard-elastic or glassy state into the liquid or rubber-elastic region.
  • this temperature is usually limited by the decomposition temperature of the polymer material used in each case. Furthermore, it is preferred that the polymer material is not heated to the melt.
  • the polymeric material is heated to below about half of its glass transition temperature (at 0 C) below the glass transition temperature.
  • the polymer material is added by the heating in a pressurizable flowable thermoelastic state, which differs from the molten state.
  • the punch is pressed into the recess until it reaches the predetermined end position, in which it encloses a cavity with the counterpart, which corresponds in shape and thus also in volume to the molded part to be produced or whose dimensions fall just short of its dimensions.
  • the punch exerts a usually very high pressure from.
  • the method according to the invention is a special type of thermoforming process.
  • the solid polymer material is introduced into the recess in the form of particles and / or in the form of a preformed blank.
  • a preformed blank in particular a semifinished product can be used which already partially corresponds in its dimensions to the molded part to be produced.
  • blanks can be punched out of sheets or films.
  • Other blank types include bodies derived from rod, tube or tubular semi-finished products.
  • the forming factor can be specified. Particularly preferred methods have a forming factor of 20% of the molded part volume or more.
  • the deformation factor is preferably not more than 70%, in particular not more than 50%.
  • the polymer material is preferably selected from PTFE, modified PTFE, PFA, MFA, FEP, ETFE, ECTFE, PVDF, PCTFE, THF and mixtures of two or more of these polymers.
  • PPVE perfluoropropyl vinyl ether
  • ETFE ethylene-tetrafluoroethylene copolymer.
  • ECTFE ethylene-chlorotrifluoroethylene copolymer.
  • PVDF polyvinylidene fluoride. Poly-chlorotrifluoroethylene.
  • THV tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride terpolymer.
  • the process according to the invention particularly preferably uses polymer material which comprises a substantially fully fluorinated polymer.
  • Such substantially fully fluorinated polymers are preferably a TFE copolymer whose co-monomer content is about 3.5 mol% or less, preferably 3 mol% or less, in particular about 1 mol% or less.
  • Such materials have properties that are very similar to conventional standard PTFE, but such materials are melt-processable and can be used to great advantage in the present inventive process.
  • Preferred co-monomers for the aforementioned TFE copolymers are selected from hexafluoropropylene, perfluoroalkyl vinyl ether, perfluoro (2,2-dimethyl-1,3-dioxole) and chlorotrifluoroethylene.
  • polymer materials which comprise a polymer compound with a filler material whose proportion is about 60% by weight or less, based on the mass of the polymer compound.
  • the filler material used in the polymer compounds preferably has a filler in fiber form and / or in granular form.
  • the filler material comprises one or more components selected from glass fibers, glass spheres, hard and soft carbon. leparticles and fibers, graphite, conductive carbon black, metal fibers, metal particles, in particular bronze particles and steel powder, quartz, Al 2 O 3 , CaF 2 , mica, minerals, in particular BaSO 4 and organic polymer materials.
  • the last-mentioned filling materials, namely the organic polymer materials in turn, are preferably selected from polyamide, polyamide, PPS, PEEK, PPSO 2 , aromatic polyesters and aramids and mixtures of two or more of these materials.
  • the proportion of the organic polymer material is limited to about 25 wt.% Or less, based on the mass of the polymer compound.
  • this proportion is limited to about 20 wt.% Or less.
  • Particularly preferred polymeric materials include a blend of a thermoplastic PTFE and another thermoplastic polymer.
  • the polymer material in the case of partially crystalline materials for forming, the polymer material must, according to the invention, be heated to a temperature above the glass transition temperature of the respective material.
  • a temperature is particularly preferred.
  • a temperature range of about 100 0 C to about 350 0 C is preferred.
  • the temperature will be lower, preferably in the range of half the glass transition temperature (in 0 C) to below the glass transition temperature, that is for the example of the polymer material THV about 55 0 C bis about 140 0 C, wherein the choice of the glass transition temperature of the type of polymer used in each case depends.
  • the heating of the polymer material is particularly preferably carried out by means of an induction or microwave heating.
  • a polymer material can be brought to very high temperatures within a few seconds.
  • the use of an induction heater thus enables a high throughput.
  • the heating can be direct or indirect, depending on the electrical conductivity of the polymer material used.
  • the polymer material used comprises as one component at least one polymer selected from the group consisting of polyethylene (PE), ultra-high molecular weight polyethylene (UHMWPE), polypropylene (PP), polyoxymethylene (POM), polyphenylene sulfide (PPS), polytetrafluoroethylene (PTFE), and polyetheretherketone (PEEK).
  • PE polyethylene
  • UHMWPE ultra-high molecular weight polyethylene
  • PP polypropylene
  • POM polyoxymethylene
  • PPS polyphenylene sulfide
  • PTFE polytetrafluoroethylene
  • PEEK polyetheretherketone
  • polymer materials which can no longer be processed by conventional processes due to their high viscosity or their infusibility can also be processed by a process according to the invention.
  • Especially such materials are often very interesting as materials, for example because of their high resistance to chemicals.
  • polymer materials with average molecular weights of up to 10 8 g / mol are processed according to the invention.
  • both pure polymer materials can be processed and polymer materials which have one or more fillers.
  • fillers a polymer which can be used in a process according to the invention can comprise organic and / or inorganic, in particular also metallic, fillers.
  • Fig. 1 is a schematic representation for explaining the
  • FIG. 2 to 4 in a schematic representation of the sequence of individual steps of the method according to the invention.
  • FIG. 1 shows a cuboid 10, which is intended to represent the geometry of a blank which is to be processed by the method according to the invention.
  • FIG. 1 shows a cuboid 12 which is intended to represent the shaped part as a result of the method according to the invention schematically.
  • the two cuboids 10 and 12 are identical in volume.
  • the dimensions in height and width differ.
  • the difference volumes .DELTA.V illustrated on the one hand in the cuboid 10, on the other hand in the cuboid 12, are identical in each case and correspond to the volume which was displaced spatially during the forming step according to the inventive method under pressure in a flow movement.
  • the deformation factor is defined by the ratio of ⁇ V to the volume of the cuboid 10 or of the identical volume of the cuboid 12.
  • FIGS. 2 to 4 show in a schematic way the sequence of the method according to the invention with reference to a substantially disk-shaped component to be produced.
  • a blank 20 is produced in a conventional manner in the form of a precisely annular disk-shaped component.
  • the production of such blanks, whether by extrusion, sintering or another method, is widely known in the art, so that will not be discussed in detail.
  • the blank can be punched out of a plate-shaped semi-finished product.
  • This blank 20 is then reshaped by means of a die 22 comprising a punch 24 and a corresponding counterpart 26.
  • the counterpart 26 has a receptacle 28 for the polymer material, in the present example in the form of the blank 20, as well as the punch 24.
  • the receptacle 28 has centrally a pin-shaped projection 29 which serves to center the blank 20 in the receptacle 28.
  • the pin 29 is the shaping.
  • the punch 24 is in an initial position in which this engagement with the counterpart 26 is positioned. Such a situation is shown in FIG.
  • the blank 20 is positioned in the receptacle 28.
  • the polymer material of the blank 20 is heated via the press-forming tool 22 to the temperature dependent on the polymer material itself (cf the above discussion), in which the polymer material is in the thermoelastic state.
  • the heating is preferably done by means of an inductive heating device (not shown).
  • the tool 22 is closed, so that the punch 24 engages in the recess 28.
  • the punch 24 is further acted upon by a force F (compare situation shown in Fig. 3), due to which the now heated to the process temperature polymer material of the blank 20 begins to flow and in the radial direction to the side walls of the recess 28 expands. Furthermore, the polymer material of the blank 20 is able to flow into a part of a recess 30 in the punch 24, forming an upwardly projecting annular volume fraction.
  • the forming process is completed by, as shown in Fig. 4, the punch 24 of the die is transferred to its final position in which the die 24 defines together with the counterpart 26, a cavity corresponding in shape and volume of the molded part 32 to be produced.
  • the molding 32 shown schematically here has an annular disc-shaped base body 34 and an integrally formed thereon, upstanding Covenant 36 on.
  • the resulting workpiece has no voids, weld lines or other undesirable features and can be fed substantially readily to its destination.
  • inventive method can be combined with other molding processes, such as deep drawing, or even processes in which the polymer material is in a molten state.
  • the method according to the invention is then preferably used for the final shaping.

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

Abstract

L'invention concerne un procédé de fabrication de pièces (32), en particulier, de pièces microscopiques. Ce procédé consiste à utiliser un outil d'emboutissage (22) pourvu d'un poinçon (24) et d'une matrice (26) correspondante, le poinçon, dans une position d'extrémité déterminée, définissant une cavité (28) avec la matrice, dont la forme correspond sensiblement à celle de la pièce à fabriquer. Le procédé met en application un matériau polymère thermoplastique partiellement ou totalement fluoré, amorphe ou partiellement cristallin à température ambiante.
PCT/EP2008/006683 2007-08-24 2008-08-14 Fabrication de pièces en plastique par déformation Ceased WO2009027019A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007040893A DE102007040893A1 (de) 2007-08-24 2007-08-24 Herstellung von Kunststoff-Formteilen durch Umformung
DE102007040893.7 2007-08-24

Publications (1)

Publication Number Publication Date
WO2009027019A1 true WO2009027019A1 (fr) 2009-03-05

Family

ID=39865159

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2008/006683 Ceased WO2009027019A1 (fr) 2007-08-24 2008-08-14 Fabrication de pièces en plastique par déformation

Country Status (2)

Country Link
DE (1) DE102007040893A1 (fr)
WO (1) WO2009027019A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014009729A1 (de) * 2014-06-28 2015-12-31 Daimler Ag Verfahren und Werkzeuganordnung zur Herstellung eines Bauteils aus faserverstärktem Kunststoff und Bauteil aus faserverstärktem Kunststoff
FR3129586B1 (fr) * 2021-11-26 2024-08-02 Fx Solutions procédé pour la fabrication d’un implant de prothèse articulaire à l’aide d’une empreinte en céramique

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1306377A (fr) * 1969-02-17 1973-02-07
DE3723489A1 (de) * 1987-03-11 1988-09-22 Hoechst Ag Verfahren zur herstellung eines formkoerpers aus einem vorformling, der im wesentlichen aus polymerisierten einheiten des tetrafluorethylens besteht
EP0335097A2 (fr) * 1988-03-30 1989-10-04 General Electric Company Moulage par compression en utilisant des feuilles isolantes
EP1335214A1 (fr) * 2000-10-20 2003-08-13 Mitsubishi Chemical Corporation Lentille de projection

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2522241A1 (fr) * 1982-02-22 1983-08-26 Thomson Csf Procede de fabrication de transducteurs polymeres piezoelectriques par forgeage
JPS62176824A (ja) * 1986-01-31 1987-08-03 Taiho Kogyo Co Ltd フツ素樹脂からなるシ−ル部材の製造方法
US20070160822A1 (en) * 2005-12-21 2007-07-12 Bristow Paul A Process for improving cycle time in making molded thermoplastic composite sheets

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1306377A (fr) * 1969-02-17 1973-02-07
DE3723489A1 (de) * 1987-03-11 1988-09-22 Hoechst Ag Verfahren zur herstellung eines formkoerpers aus einem vorformling, der im wesentlichen aus polymerisierten einheiten des tetrafluorethylens besteht
EP0335097A2 (fr) * 1988-03-30 1989-10-04 General Electric Company Moulage par compression en utilisant des feuilles isolantes
EP1335214A1 (fr) * 2000-10-20 2003-08-13 Mitsubishi Chemical Corporation Lentille de projection

Also Published As

Publication number Publication date
DE102007040893A8 (de) 2009-06-18
DE102007040893A1 (de) 2009-02-26

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