EP2911854A1 - Outil de formage, moyen de commande, procédé et installation pour produire une pièce en matière plastique, de préférence renforcée par des fibres - Google Patents

Outil de formage, moyen de commande, procédé et installation pour produire une pièce en matière plastique, de préférence renforcée par des fibres

Info

Publication number
EP2911854A1
EP2911854A1 EP13785398.2A EP13785398A EP2911854A1 EP 2911854 A1 EP2911854 A1 EP 2911854A1 EP 13785398 A EP13785398 A EP 13785398A EP 2911854 A1 EP2911854 A1 EP 2911854A1
Authority
EP
European Patent Office
Prior art keywords
tool
cavity
opening
tool parts
closed position
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Withdrawn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
EP13785398.2A
Other languages
German (de)
English (en)
Inventor
Matthias Graf
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.)
Dieffenbacher GmbH Maschinen und Anlagenbau
Original Assignee
Dieffenbacher GmbH Maschinen und Anlagenbau
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 Dieffenbacher GmbH Maschinen und Anlagenbau filed Critical Dieffenbacher GmbH Maschinen und Anlagenbau
Publication of EP2911854A1 publication Critical patent/EP2911854A1/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Withdrawn legal-status Critical Current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
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/0038—Moulds or cores; Details thereof or accessories therefor with sealing means or the like
    • 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
    • B29C70/48—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 and impregnating the reinforcements in the closed mould, e.g. resin transfer moulding [RTM], e.g. by vacuum
    • 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
    • B29C43/32—Component parts, details or accessories; Auxiliary operations
    • B29C43/36—Moulds for making articles of definite length, i.e. discrete articles
    • B29C43/3607—Moulds for making articles of definite length, i.e. discrete articles with sealing means or the like
    • 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
    • B29C43/32—Component parts, details or accessories; Auxiliary operations
    • B29C43/56—Compression moulding under special conditions, e.g. vacuum
    • 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
    • B29K2105/0809—Fabrics

Definitions

  • the present invention relates to a molding tool, a control means and a
  • CFRP components Plastic components
  • RTM process resin transfer molding process
  • the fiber semi-finished products which are usually present as a multi-layer fabric or scrim-cut fiber mats, etc., reshaped, so that they are already approximately the geometry of to be produced Own composite component.
  • the individual fiber mats of the fiber semi-finished products generally have, in addition to the fiber mats, also a binder which has adhesive-like properties.
  • the binder causes a pre-consolidation of the individual fiber mats with each other and thus the preformed fiber preform (of the preform), so that it can be fed dimensionally stable to the subsequent processes.
  • the fiber preform can also be called just preform.
  • Prefabricated fiber mats are thus laid one above the other in layers according to a predefined fiber layer structure to form a semifinished fiber product for the preforming process.
  • This formed from fiber mats fiber semi-finished product is then heated at room temperature, or to a forming temperature in a
  • Preform or preform tool transferred.
  • the transformation of the fiber semi-finished product into a fiber preform takes place by closing the tool.
  • the edge region of the fiber preform thus produced can still be trimmed (hereinafter also referred to as trimming or netshaping), for example by Punching or ultrasonic cutting, so that the fiber preform has defined contour edges.
  • the fiber preform is finally removed from the mold and, if necessary, temporarily stored for carrying out the following process and method steps. During the interim storage, a first quality control can already take place.
  • the shaping ridge of the fiber preform (of the preform) as well as any fiber distortions, fiber undulations, folds or similar surface defects can be detected.
  • the fiber preform is placed in a cleaned and separated, ie with an anti-adhesive agent coated cavity of an RTM tool.
  • the usually two-part mold is then closed by a press and a two-component
  • Tool base usually an elastomeric seal.
  • elastomeric seal As a rule, commercially available round cord seals are used for this purpose.
  • the fiber preform must also be very precise in its outer contour here. As already described, this is usually achieved by trimming the preform before the RTM process. However, it is still essential that a gap between the preform and the seal arises. This gap leads to the negative characteristic that a kind of "channel", usually in the edge region, arises, through which the resin flows in uncontrolled manner and short-circuits the flow front within the fiber preform, which can lead to undesirable air pockets and incorrect impregnations "Channel" are also filled with resin, which leads to increased resin consumption, and thus in particular to competitive disadvantages in large series.
  • HP-RTM high-pressure RTM process
  • HP-CRTM high pressure compression RTM
  • HP-IRTM high pressure injection RTM
  • the resin is injected into a defined (low) open mold containing a fiber preform. After the injection process, the mold is closed and the fiber preform due to the
  • Resin injection pressure of, for example, 35 bar impregnated.
  • the high injection pressure leads to a shortening of the impregnation phase.
  • the present invention has for its object to provide a comparison with the prior art improved, in particular simplified and inexpensive, sealing method, in particular for the opening to a vacuum port for evacuation of the cavity, which advantages of the RTM method and in particular the
  • HP-RTM high-pressure RTM process
  • Patent claim 1 by a control means for each other method of two
  • Plastic component with the features of claim 1 and by a system for carrying out a method for producing a, preferably fiber-reinforced, plastic component having the features of claim 14.
  • fiber-reinforced, plastic component is based on generic forming tools with at least two to each other in at least a first and a second
  • Plastic component corresponds; with at least one, in a tool part
  • a forming tool according to the invention is distinguished from generic forming tools by the fact that between the first and the second tool part at least a first seal is arranged as planned with respect to the opening to the vacuum port, that in a first closed position of the tool parts, the cavity via the opening to Vacuum connection evacuated and in a second closed position of the tool parts, the evacuated cavity also opposite the opening to the vacuum connection
  • An inventively designed mold has the advantage that with one and the same, the tool parts relative to the surrounding air pressure sealing seal, if necessary, both evacuate the cavity through the opening to the vacuum port and the evacuated cavity can seal against the opening to the vacuum port.
  • At least one tool part is operatively connected to an injection system in a manner known per se.
  • an embodiment of the molding tool has proved to be effective, in which the injection system for the introduction of the resin system with the tool part is operatively connected, in which the opening is formed to the vacuum port.
  • an embodiment of the molding tool is preferred, in which between the first and the second tool part additionally at least a second, the tool parts relative to the surrounding air pressure sealing seal is arranged as planned with respect to the first seal and the opening to the vacuum port that over the opening Vacuum can also be held in the tool advantageous even if the
  • Tool parts have already been moved to the second closed position for introducing the resin system in the evacuated cavity.
  • the subject matter of the present invention is also a control means for mutually moving two tool parts of a molding tool, in particular one
  • a control means according to the invention is distinguished from genus-forming control means by a first closed position in which at least a first seal seals the tool parts against the surrounding air pressure to one another such that the cavity can be evacuated via an opening to a vacuum connection; and by a second closed position in which the at least one first seal seals the evacuated cavity also opposite the opening to the vacuum port. Due to the advantageous approachability of the tool parts in at least two closed positions is necessary and in a cheap and easy way with one and the same, the tool parts against the surrounding air pressure
  • Vacuum connection sealable In a first embodiment of the control means, it is preferred that in the second closed position an injection system for introducing a resin system into the evacuated cavity can be activated.
  • the cavity of the tool parts can already be closed to the desired component thickness of the plastic component in the second or only in a third closed position; so that in particular both high-pressure compression RTM method (HP-CRTM) and high-pressure injection RTM method (HP-IRTM) can be carried out.
  • HP-CRTM high-pressure compression RTM method
  • HP-IRTM high-pressure injection RTM method
  • an embodiment of the control means with which the vacuum connection remains activated when moving the tool parts into the second or third closed position in which at least one second seal seals the tool parts against the surrounding air pressure remains activated the opening to the vacuum port can still be kept vacuum in the tool.
  • the subject matter of the present invention is also a method for producing a, preferably fiber-reinforced, plastic component in at least two mutually movable tool parts of a molding tool, in particular in one
  • Plastic component corresponds; and in particular using a control means as described above.
  • fiber-reinforced, plastic component is distinguished from the known method in that the two, in particular already equipped with a fiber preform of the plastic component, tool parts are first moved into a first closed position, in which at least a first seal the tool parts against the surrounding air pressure dergestalt seals that the cavity can be evacuated via an opening to a vacuum connection; then the cavity formed by the tool parts is evacuated through the opening to the vacuum port; then the two tool parts are moved into a second closed position, in which the at least one first seal seals the evacuated cavity also with respect to the opening for the vacuum connection; and then an injection system for introducing a resin system is activated in the cavity.
  • an embodiment of the method is preferred in which between the first and the second tool part additionally at least a second tool parts relative to the surrounding air pressure sealing seal such planned with respect to the first seal and the opening to
  • Vacuum connection is arranged that over the opening vacuum even then in the Tool can be maintained when the tool parts have already been moved to the second closed position for introduction of the resin system in the evacuated cavity.
  • HP-CRTM high-pressure compression RTM
  • HP-IRTM high-pressure injection RTM
  • Molded cavity corresponds to the desired component thickness of the plastic component to be manufactured
  • the present invention is also a plant for carrying out a method for producing a, preferably fiber-reinforced, plastic component, in particular a method as described above.
  • the inventive system is characterized by a mold as described above with at least two mutually movable in at least a first and a second closed position tool parts, with which a cavity can be formed, which corresponds to the desired component thickness of the plastic component to be manufactured; at least one, in one
  • Molded part opening to a vacuum port for evacuation of the cavity an injection system for introducing a resin system into the evacuated cavity; and a press for moving and fixing the tool parts in the open and closed positions of the mold.
  • the present invention provides a reliable sealing method especially for opening to a vacuum port for evacuating the cavity.
  • a preferred embodiment according to the invention allows you to use even with the help of a second seal advantageous even then vacuum in the tool to hold when the tool parts already in the second closed position for introduction of the Resin system were moved into the evacuated cavity. It is particularly suitable for all RTM methods.
  • Fig. 1 shows the typical stations a) to h) of a plant for carrying out a
  • FIG. 2 shows the typical process steps a) to d) in an RTM system, in particular for carrying out an HP-CRTM method, for producing a
  • a fiber preform 3 is formed in the course of manufacture from a fiber semifinished product 4, which in turn consists of at least two fiber mats 5 or comparable fiber fabrics and thus can also be referred to as a fiber mat stack.
  • the fiber preform 3 can, in support of the present process, have an edge region in which a sealant material has been introduced, in particular in the case of extreme high-pressure injection methods, the sealing of the
  • the main form 2 of the finished plastic component 1 differs essentially in still necessary transfer or processing steps, which need not be explained in detail here.
  • cavity is meant by the tool parts in partial or complete
  • FIG. 1 schematically shows typical stations a) to h) of a system 10 for carrying out a method for producing a fiber-reinforced plastic component 1, comprising at least the method steps: cutting individual fiber mats 5 (method step 1 .1) in a blanking station (see FIG 1 a); Stacking - with or without hindrance - (see Fig. 1 c) a plurality of fiber mats 5 to a semi-finished fiber 4 outside or within a at least two tool parts 31, 32 preforming tool 30 (process step 1 .2) of a preform Appendix (see Fig. 1 d) or - esp.
  • preform and main mold tools are integrally formed (not shown) - within a at least two tool parts 21, 22nd
  • Einbringstoff 1 1 as in particular a flat-top nozzle 12 (see Fig. 1 b) for the purpose of one with respect to the process steps 1 .2 and / or 1.3 upstream, simultaneous and / or downstream application and / or introduction of an at least partially circulating for use as Sealant suitable material 6 on single, multiple and / or all fiber mats 5 and / or the fiber-semifinished product 4 such that at the latest before the implementation of the provided in step 1 .4 RTM process in a completely peripheral edge region 3a of Fiber preform 3 all local fiber pores and fiber spaces are closed by the sealant material 6.
  • a sealing method is provided with the present invention, in particular for the opening 25 to a vacuum port for evacuating the cavity (see Fig. 1f), which is characterized in particular that between the first and the second tool part 21, 22 at least one first seal 23a is arranged according to plan with respect to the opening 25 for vacuum connection, that in a first closed position A of the tool parts 21, 22, the cavity via the opening 25 to the vacuum port evacuated and in a second closed position of the tool parts 21, 22, the evacuated cavity also with respect to Opening 25 is sealed to the vacuum port.
  • FIG. 2 shows by way of example the typical process steps a) to d) in an RTM plant, preferably for carrying out an HP-CRTM process for producing a, preferably fiber-reinforced, plastic component 1.
  • Fig. 2a shows the at least two tool parts 21, 22 comprehensive mold 20 a RTM system in an open position.
  • the upper tool part (male) 21 and the lower tool part (die) 22 are formed corresponding to each other in such a way that they form in a final closed position one of the main mold 2 of the plastic component 1 corresponding cavity into which a resin system is injected later.
  • Injection system 24 for infiltrating the fiber preform 3 to keep the mold 20 closed against the surrounding air pressure, located between the upper tool 21 and lower tool part 22 at least one, in particular elastomers containing, the main seal 23.
  • the main seal 23 located between the upper tool 21 and lower tool part 22 at least one, in particular elastomers containing, the main seal 23.
  • two or more so-called seals 23a and 23b may be provided, which completely seal a tool part 21 with the other tool part 22 against the surrounding air pressure, for example circumferentially.
  • at least one opening 25 in at least one tool part 21, 22 is formed into a vacuum connection - shown in the lower tool part 22 in FIG.
  • FIG. 2b shows the two-part molding tool 20 of an RTM installation from FIG. 2a with a preformed preformed fiber preform 3 integrated in the edge region thereof, in which case a completely circumferential one Edge region of the fiber preform 3 all local fiber pores and fiber interstices are closed by the sealant material 6. It can be seen how, already in a first closed position, the tool parts 21 and 22 which are only partially closed can be closed airtightly relative to one another via the lower peripheral seal 23a and the cavity formed thereby can be evacuated via the opening 25 to a vacuum port.
  • Fig. 2c shows the two-part mold 20 of an RTM system of Fig. 2b in a second, more closed position in which the opening 25 to the
  • Vacuum connection now by the first (lower) seal 23a relative to the cavity formed by the tool parts 21, 22 and the tool parts 21 and 22 are additionally sealed by a second (upper) seal 23b, so that through the opening 25 vacuum even then in the mold 20 can be safely held when the tool parts 21, 22 have already been moved to the second closed position for introduction of the resin system in the evacuated cavity.
  • a main seal 23 may be sufficient if it can completely cover the opening 25 in the course of driving the tool parts 21, 22 from the first to the second position. But even in this special case, it may be necessary to provide a second seal 23b.
  • Tool parts 21 and 22 are first closed to a defined gap to inject resin without significant flow resistance above or - as shown - below the outer layer of the fiber preform 3 and then with
  • FIG. 2d shows the two-part molding tool 20 of an RTM installation from FIG. 2c in a third, final closed position, in which the cavity left by the tool parts 21 and 22 now has the desired component thickness of the component to be manufactured
  • Plastic component 1 corresponds, so that the previously injected resin are pressed into the pores and interstices of the fiber preform 3, without passing through the means of the sealant material 6 previously formed in the fiber preform 3 integrated seal.
  • a final shape of the plastic component 1 can be obtained by simply trimming the main mold 2 (cf., Fig. 1 g) of the plastic component 1 with separation of the sealant material 6.
  • this mats may contain glass fibers, carbon fibers, ceramic fibers, aramid fibers, boron fibers, steel fibers, natural fibers, nylon fibers or comparable fibers and / or mixtures thereof and / or also so-called random fiber mats (recycled fiber mats).
  • the present invention provides a reliable sealing method especially for the opening 25 to a vacuum port for evacuating the cavity.

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)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

La présente invention concerne un outil de formage (20), un moyen de commande et un procédé pour produire une pièce en matière plastique (1), de préférence renforcée par des fibres La présente invention concerne également une installation (10) pour la mise en oeuvre dudit procédé. L'outil de formage (20) selon l'invention se distingue des outils de formage du même genre, en ce qu'au moins un premier élément d'étanchéité (23a) est disposé entre la première (21) et la deuxième partie d'outil (22) par rapport à l'ouverture (25) vers le raccord à vide de sorte que, dans une première position de fermeture des parties d'outil (21, 22), le vide peut être créé dans la cavité par l'intermédiaire de l'ouverture (25) vers le raccord à vide, et dans une deuxième position de fermeture des parties d'outil (21, 22), la cavité sous vide est également rendue étanche par rapport à l'ouverture (25) vers le raccord à vide. L'avantage de la présente invention réside dans le fait qu'un seul et même élément d'étanchéité (23), rendant les parties d'outil (21, 22) étanches par rapport à la pression d'air entourant ces dernières, permet le cas échéant de créer un vide dans la cavité par l'intermédiaire de l'ouverture (25) vers le raccord à vide et de rendre étanche la cavité sous vide par rapport à l'ouverture (25) vers le raccord à vide.
EP13785398.2A 2012-10-29 2013-10-25 Outil de formage, moyen de commande, procédé et installation pour produire une pièce en matière plastique, de préférence renforcée par des fibres Withdrawn EP2911854A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012110354.2A DE102012110354B4 (de) 2012-10-29 2012-10-29 Formwerkzeug, Steuermittel, Verfahren und Anlage zum Herstellen eines, vorzugsweise faserverstärkten, Kunststoffbauteils
PCT/EP2013/072372 WO2014067865A1 (fr) 2012-10-29 2013-10-25 Outil de formage, moyen de commande, procédé et installation pour produire une pièce en matière plastique, de préférence renforcée par des fibres

Publications (1)

Publication Number Publication Date
EP2911854A1 true EP2911854A1 (fr) 2015-09-02

Family

ID=49515336

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13785398.2A Withdrawn EP2911854A1 (fr) 2012-10-29 2013-10-25 Outil de formage, moyen de commande, procédé et installation pour produire une pièce en matière plastique, de préférence renforcée par des fibres

Country Status (8)

Country Link
US (1) US20150290842A1 (fr)
EP (1) EP2911854A1 (fr)
JP (1) JP2015532901A (fr)
KR (1) KR20150079900A (fr)
CN (1) CN104736312A (fr)
CA (1) CA2887577A1 (fr)
DE (1) DE102012110354B4 (fr)
WO (1) WO2014067865A1 (fr)

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DE102012110354B4 (de) 2021-11-18
CN104736312A (zh) 2015-06-24
KR20150079900A (ko) 2015-07-08
CA2887577A1 (fr) 2014-05-08
DE102012110354A1 (de) 2014-04-30
US20150290842A1 (en) 2015-10-15
JP2015532901A (ja) 2015-11-16
WO2014067865A1 (fr) 2014-05-08

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