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WO2008055459A2 - Procédé de production d'un ressort à lames en un matériau composite fibreux avec une matière thermoplastique - Google Patents

Procédé de production d'un ressort à lames en un matériau composite fibreux avec une matière thermoplastique Download PDF

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Publication number
WO2008055459A2
WO2008055459A2 PCT/DE2007/001842 DE2007001842W WO2008055459A2 WO 2008055459 A2 WO2008055459 A2 WO 2008055459A2 DE 2007001842 W DE2007001842 W DE 2007001842W WO 2008055459 A2 WO2008055459 A2 WO 2008055459A2
Authority
WO
WIPO (PCT)
Prior art keywords
fiber strand
fibers
thermoplastic
abdeckmaterialbahn
fiber
Prior art date
Application number
PCT/DE2007/001842
Other languages
German (de)
English (en)
Other versions
WO2008055459A3 (fr
Inventor
Matthias Voigt
Original Assignee
Ifc Composite Gmbh
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
Priority claimed from DE102006052137A external-priority patent/DE102006052137B4/de
Priority claimed from DE102006052136A external-priority patent/DE102006052136B4/de
Priority claimed from DE102007003596A external-priority patent/DE102007003596B4/de
Application filed by Ifc Composite Gmbh filed Critical Ifc Composite Gmbh
Publication of WO2008055459A2 publication Critical patent/WO2008055459A2/fr
Publication of WO2008055459A3 publication Critical patent/WO2008055459A3/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • 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
    • 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
    • B29C70/06—Fibrous reinforcements only
    • B29C70/08—Fibrous reinforcements only comprising combinations of different forms of fibrous reinforcements incorporated in matrix material, forming one or more layers, and with or without non-reinforced layers
    • B29C70/086—Fibrous reinforcements only comprising combinations of different forms of fibrous reinforcements incorporated in matrix material, forming one or more layers, and with or without non-reinforced layers and with one or more layers of pure plastics material, e.g. foam layers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/24—Impregnating materials with prepolymers which can be polymerised in situ, e.g. manufacture of prepregs
    • C08J5/241—Impregnating materials with prepolymers which can be polymerised in situ, e.g. manufacture of prepregs using inorganic fibres
    • C08J5/244—Impregnating materials with prepolymers which can be polymerised in situ, e.g. manufacture of prepregs using inorganic fibres using glass fibres
    • 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
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/774—Springs

Definitions

  • the invention relates to a method for producing a leaf spring made of a fiber composite material according to the preamble of claim 1 and to a leaf spring produced in accordance with the preamble of claim 18.
  • leaf springs can be produced from a fiber composite material. Such leaf springs have over conventional leaf springs made of metallic materials the advantage of lower weight and a longer shelf life. By choosing the layer thicknesses of the laminate and by the respective orientation of the fibers in a plastic matrix, the spring characteristic can be influenced within wide limits.
  • leaf springs made of fiber-reinforced materials of so-called wet laminates or prepregs are produced, which are layered with the desired fiber orientation and then pressed and cured.
  • the term prepreg is known to mean a semifinished product or a precursor for the production of articles from a fiber composite material.
  • a prepreg conventionally consists of fibers and an uncured thermosetting plastic matrix. In this case, the continuous fibers may be unidirectionally aligned or present as tissue or scrim.
  • a thermosetting plastic matrix usually consists of a mixture of a synthetic resin, a hardener and an accelerator. For example, resins based on epoxy resin or vinyl ester resin are used as synthetic resins.
  • the fibers are deposited, for example, on a support and then wetted with the synthetic resin. Also an impregnation of the fibers with the still liquid resin before it is deposited on the carrier is known.
  • the chemical reaction of the hardener and the accelerator with the synthetic resin is prevented until the prepreg is to be used for the production of a final product.
  • the prepreg is to be used for the production of a final product.
  • To produce a fiber composite leaf spring several prepreg layers are stacked and then cut. By subsequently heating this workpiece beyond the reaction temperature of the hardener, the curing process begins, eventually leading to the desired end product. If this heating is carried out in a press and in an autoclave at atmospheric negative pressure, air bubble-free end products can be produced with a very high fiber content and comparatively low plastic matrix content.
  • a strand of continuous fibers must be supplied to a manufacturing apparatus of this type. It is important to ensure that the fibers remain in the desired spatial orientation. The fiber distribution should therefore usually be homogeneous. In addition, should occur in the supply and further processing of the fiber strand as small as possible fiber breakage.
  • the fiber strand should preferably be wetted with said thermoset plastic matrix, ie the mixture of at least synthetic resin, hardener and accelerator. It is important that the distribution of the thermosetting plastic matrix is uniform or all fibers of the fiber strand are impregnated by the plastic matrix. In addition, not too much of the plastic matrix must reach the fiber strand, since this would result in a lateral discharge of the excess liquid to an undesirably large extent.
  • the fiber strand in the production of the prepreg strand preferably on its underside and at its top with a Abdeckmaterialbahn cover.
  • Abdeckmaterialbahnen When placing these Abdeckmaterialbahnen on the fiber strand, it may happen that the fibers of the upper and / or the lower fiber layer of the fiber strand are folded in an unwanted manner transverse to the longitudinal extent of the fiber strand. In a fiber composite end product so folded fibers contribute little to the desired material properties, which is why such fiber folding should be avoided.
  • a leaf spring made of a fiber composite material and a method for producing the same is known for example from DE 10 2004 010 768 A1.
  • the axial ends of a central longitudinal section with respect to the leaf spring width are tapered, wherein the axially aligned fibers of the fiber composite material are uncut out to the end edge of the leaf spring.
  • the manufacture of the leaf spring takes place with a duroplastic plastic matrix which cures when exposed to heat.
  • the fibers in a desired orientation in a related manufacturing device get there and there with a lower and an upper Abdeckmaterialbahn It can be demonstrated that the plastic matrix, which has not set yet, reaches all fibers of the fiber strand in sufficient quantity, that fiber breakage is minimized, and that folding of the fibers transverse to the longitudinal extent of the fiber strand is avoided, it is provided that the fiber strand with the non-set thermoset Plastic matrix and the two Abdeckmaterialbahnen on a convexly curved and heated heating table is merged.
  • the known method is based on the finding that, when the fiber strand is combined with a lower and / or upper plastic matrix-covered covering material web or another flexible fabric structure on a heating table having a convexly shaped surface, all of the stated requirements for producing an optimum prepreg can be fulfilled.
  • DE 10 2006 052 136 A1 also discloses a device with which the production method just described can be carried out. Accordingly, the device for producing prepregs from a fiber strand with fibers oriented at least parallel to one another and with two plastic material-containing cover material webs is characterized by at least the following features:
  • the known method comprises the following method steps:
  • a fiber strand which consists of at least parallel aligned fibers, with at least one Abdeckmaterialbahn.
  • thermosetting plastic matrix wetting the fibers of the fiber strand with a not yet set thermosetting plastic matrix.
  • thermosetting plastic matrix Heating the covered and plastic matrix-occupied fiber strand for impregnating the fibers of the fiber strand with the not yet set thermosetting plastic matrix.
  • leaf springs made of a fiber composite material, which uses a thermoplastic material.
  • DE 102 60 060 A1 describes a leaf spring for a motor vehicle, which may be made of various materials, which may include composite materials, metals, metal-metal castings and plastic-metal-hybrid materials.
  • the leaf spring may be made of a thermoplastic composite material, no information is given on the internal structure or on the production thereof.
  • JP 63 225 738 A a leaf spring for a vehicle is known, which is made of a multilayer fiber composite material. Certain layers of material of this leaf spring are used for vibration damping and consist of a viscoelastic material, such as a thermoplastic such as polyethylene, various foams, elastomers and rubber.
  • a viscoelastic material such as a thermoplastic such as polyethylene, various foams, elastomers and rubber.
  • the present invention seeks to provide a method for producing leaf springs made of a fiber composite material, with which also the technical problems described above can be mastered and a high-quality leaf spring is produced as inexpensively.
  • the fibers are present in the leaf spring in a desired orientation, that the not yet hardened plastic matrix in the leaf spring reaches all fibers in sufficient quantity, that the extent of fiber breakage in the leaf spring is minimized, and that a folding of the Fibers transverse to the longitudinal extent of the fiber strand is at least largely avoided.
  • Another object is to describe the structure of a fiber composite leaf spring produced in this way.
  • the invention is based on the finding that a leaf spring made of a fiber composite material can then meet the very high quality requirements prevailing in the automotive industry and is also comparatively inexpensive to produce if the fiber composite material is produced using at least one thermoplastic material.
  • thermosetting plastic in the production of a related fiber composite material or for producing a known fiber composite leaf spring is bound to the compliance of many process parameters. These include the mixing ratio of resin, hardener and accelerator and compliance with predetermined upper and lower temperature limits in order to ensure a useful for the manufacturing process viscosity of the thermosetting plastic matrix and to avoid premature and unwanted curing.
  • thermoplastic in the production of a fiber composite leaf spring is comparatively simple and therefore very advantageous, since in the processing of this plastic only a solidification temperature or melting temperature has to be taken into account.
  • the invention therefore initially relates to a method for producing a leaf spring made of a fiber composite material, which is characterized by the following method steps:
  • thermoplastic Melting of a thermoplastic
  • thermoplastic material can optimally be distributed in the fiber strand without causing undesired fiber breakage or fiber folding or transverse orientation of fibers the longitudinal extent of the fiber strand comes.
  • wetted with the thermoplastic fiber strand is packed by the at least one Abdeckmaterialbahn top, bottom and side so that the dimensional stability of a prepreg produced in this way and favors a later outflow of excess thermoplastic material in a molding press.
  • the molten thermoplastic material is applied to the at least one covering material web prior to its contact with the fiber strand on the side facing the fiber strand.
  • the required amount of liquefied thermoplastic material is specifically supplied to the fiber strand only when this and the at least one Abdeckmaterialbahn are brought together on the surface of the heating table.
  • thermoplastic material is applied directly to the fibers of the fiber strand, or that the fiber strand is pulled through a container with a collection of thermoplastic material before the fiber strand is merged with the at least one Abdeckmaterialbahn.
  • a further embodiment provides that the covered with the at least one Abdeckmaterialbahn fiber strand is heated to temperatures above the melting temperature of the thermoplastic material or held on this, and with a force acting on the fiber strand and the at least one Abdeckmaterialbahn tensile force and off the curvature of the table surface resulting normal force is applied so that the thermoplastic material flows to all individual fibers and wets them.
  • thermoplastic material is used as the material for the at least one Abdeckmaterialbahn whose melting point is higher than the melting point of that thermoplastic material with which all fibers of the fiber strand are wetted. This ensures that the at least one Abdeckmaterialbahn at a merging with the other, molten hot thermoplastic material remains largely fixed and so to the mechanical stability of a prepregs produced in this way, for example for its further transport, advantageously contributes.
  • the Auflegkraft the bedroll is smaller than the normal force component of that tensile force with which the fiber strand is pulled together with the Abdeckmaterialbahnen on the heating table. This distribution of forces causes the penetration of the fiber strand with thermoplastic material is very gentle, so that fiber breakage and fiber folding can be kept low.
  • the heating table is heated and has at least two, preferably at least three different heating zones with different temperatures. This makes it possible to selectively influence the temperature of the strand of fibers, thermoplastic material and cover material webs in that decisive phase of leaf spring production, in which these leaf spring materials are brought together.
  • the surface of the heating table has an average temperature which is lower than the temperature in the coolest heating zone.
  • the covered by the at least one Abdeckmaterialbahn and plastic-permeated fiber strand directly behind the heating table, ie behind the outlet end has an average temperature which is lower than the temperature in the hottest heating zone.
  • the fiber strand covered by the at least one covering material web and guided through by plastics material is guided in the transport direction behind the heating table along the surface of a cooling table and cooled there. It is useful if the covered by the at least one Abdeckmaterialbahnen and plastic-permeated fiber strand in the transport direction behind the cooling table has an average temperature which is above the melting temperature of all thermoplastic fibers wetting the fibers.
  • the transport speed V of the fiber strand and the at least one Abdeckmaterialbahn is for example between 0.05 m / s and 0.2 m / s.
  • the covered by the at least one Abdeckmaterialbahn and plastic-permeated fiber strand is applied in the region of the outlet end of the heating of at least one smoothing roller with a force that is smaller or equal to the bearing force F1 of the Auflegrolle and smaller than that Normal force component of the tensile force on the covered fiber strand.
  • the smoothing rollers provide only for a smooth surface of the deposited on the top of the fiber strand Abdeckmaterialbahn.
  • the fibers of the fiber strand are preferably unidirectionally oriented or arranged as a woven fabric or as a scrim and formed as glass fibers, carbon fibers or Aramidfasem.
  • the temperature of the stacked prepreg layers is raised above the melting temperature T7 of the thermoplastic fibers wetting all fibers, that after another loading Period t1 to t2, the temperature of the stacked prepreg layers is raised above the melting temperature T8 of the at least one thermoplastic Abdeckmaterialbahn, and that thereafter in a further period t5 to t6, the temperature of the prepreg layers below the different melting temperatures T7 and T8 of the two thermoplastic is brought.
  • This ensures that the all-wetting thermoplastic material and the thermoplastic material of the at least one Abdeckmaterialbahn mix before the final curing of the leaf spring molten and so set no inhomogeneities in the leaf spring.
  • the method can proceed in such a way that, after the thermoplastic material has been heated above its melting temperature T7, the temperature of the prepreg layers is kept below, below the melting temperature T7 of the thermoplastic material wetting all the fibers for a certain period of time t3 to t4 ,
  • the invention relates to a leaf spring made of a fiber composite material having at least parallel aligned fiber, which are embedded in a thermoplastic material.
  • This leaf spring is composed of a plurality of layers of prepregs stacked on top of each other, wherein the prepregs each consist of a fiber strand with longitudinally parallel aligned fiber embedded in the thermoplastic resin and wherein the top and bottom surfaces of the fiber strand are at least one cover material web is covered by a thermoplastic material.
  • the melting temperature of the thermoplastic material of the at least one Abdeckmaterialbahn is above the melting temperature of that thermoplastic with which all the fibers of the fiber strand are wetted.
  • the thermoplastic resin which wets all the fibers preferably consists of polypropylene, polyamide, polyamide 6.6 or polybutylene terephthalate.
  • Fig. 1 is a highly schematic production flowchart for producing a fiber composite leaf spring
  • FIG. 2 shows a temperature profile over time in the production of the fiber composite leaf spring in the molding press according to FIG. 1.
  • FIG. 1 shows a schematic illustration of a production plant 1 for producing leaf springs 25 from a fiber composite material.
  • the production plant 1 is continuously fed with a fiber strand 2 of glass fibers oriented parallel to its longitudinal extent.
  • the fiber strand 2 is covered with a thermoplastic material 14, which will later wet all the fibers of the fiber strand 2.
  • thermoplastic material 14 The melting of the thermoplastic material 14 is carried out in the embodiment chosen here via a feeding device 13 designed as an extruder, the plastic is supplied on the input side in the form of granules, and the output side is equipped with a nozzle, the optimal storage of the molten plastic 14 on the Fiber strand 2 allowed.
  • a second stream of molten plastic 14 is deposited on an upper Abdeckmaterialbahn 3, in such a way that the plastic 14 comes to rest on that side of the Abdeckmaterialbahn 3, which later faces the fiber strand 2.
  • a second, lower Abdeckmaterialbahn 4 is fed to the production line 1 below the fiber strand 2. While these lower cover materials rialbahn 4 is guided over the input-side portion 16 of the heating table 6 to the fiber strand 2 and optionally there preheated with a lying preferably above the melting temperature T7 of the thermoplastic resin 14 table temperature T1, the upper Abdeckmaterialbahn 3 passes through a bedroll 5 with a reversal of their direction of movement in the area of the fiber strand 2.
  • the two covering material webs 3 and 4 and the fiber strand 2 are brought together on a convexly curved surface 15 of the heating table 6, wherein the laying roll 5 presses the upper Abdeckmaterialbahn 3 with a comparatively small force F1 on the thermoplastic fiber strand 2.
  • the Ablegkraft F1 of the Ablegrolle 5 is so low, so that it is ensured that no or only a relatively small proportion of fiber fraction is formed by the contact pressure.
  • thermoplastic fiber strand 2 and the two Abdeckmaterialfolien 3, 4 are pulled at a speed V and a tensile force F6 on the convex curved surface 15 of the heating table 6, acts from the tensile force F6 a normal force F2, which covers the two Abdeckmaterialbahnen 3 and 4 with the plastic 14 and the fibers of the fiber strand 2 in the direction of the surface 15 of the heating table 6 suppressed.
  • the heated thermoplastic material 14 penetrates the fiber strand 2, so that all its fibers are gently and comparatively slowly impregnated with the same.
  • the merging of the fiber strand 2 and the two Abdeckmaterialbahnen 3, 4 takes place on the convex curved surface 15 of the heating table 6 in the region of a first heating zone S1 of three heating zones S1, S2 and S3 of the same.
  • These heating zones are equipped with an electric heater or hot water heater, not shown, which ensure a comparatively accurate adjustment of the temperature of the hotplate surface 15 in the respective heating zones S1, S2 and S3.
  • This makes it possible to temper the thermoplastic material 14 between the two Abdeckmaterialbahnen 3, 4 gradually so that this example, in the first heating zone S1 and the second heating zone S2 temperatures T2 and T3, which are well above its melting temperature T7.
  • the optimum temperature in the area of the heating zones depends on the selected materials of the leaf spring and can be set individually.
  • the three heating zones S1, S2 and S3 allow a systematic temperature control, in particular of the thermoplastic material 14, wherein initially a targeted increase in temperature and thus viscosity increase is carried out, which facilitates the wetting of the fibers of the fiber strand 2 with the plastic 14.
  • the fiber breakage to be recorded is advantageously small. Since all the fibers of the fiber strand 2 and the upper Abdeckmaterialbahn 3 and the lower Abdeckmaterialbahn 4 are pulled at the same transport speed V on the heating table 6, resulting in no or only negligible relative speeds of these elements against each other, so that the initially explained fiber folding does not occur or only insignificantly.
  • thermoplastic material 14 between the two Abdeckmaterialfolien 3, 4 and in the fiber strand 2 in the third heating zone S3 can be reduced to a value T4, which is lower than the temperatures T2 and T3 of the input-side and the middle heating zone S1 and S2, However, still above the melting temperature T7 of the thermoplastic material 14 is located.
  • the Abdeckmaterialbahnen 3 and 4 consist of a thermoplastic material whose melting temperature T8 is above the melting temperature of that thermoplastic resin 14, were wetted with all the fibers of the fiber strand 2, they initially remain intact and contribute to the mechanical stability of the prepreg strand to be produced 11 at.
  • the manufacturing device 1 has three smoothing rollers 7, 8 and 9, with a comparatively low contact force or smoothing F3, F4 , Press F5 on the top of the upper Abdeckmaterialbahn 3, thereby smoothing the same perform.
  • Such a smoothing of the upper side of the upper Abdeckmaterialbahn 3 may be useful, since the Ablegkraft F1 of the Ablegrolle 5 is relatively low.
  • the average temperature T5 of the covered and plastic-impregnated prepreg strand 11 in this embodiment is slightly above the melting temperature T7 of the thermoplastic material 14.
  • this strand 2 is made of fibers, covering material NEN 3, 4 and thermoplastic material 14 in a further process step pulled over the cooled surface of a cooling table 10.
  • the prepreg strand 11 impregnated with the plastic 14, when leaving the cooling table 10, has an average temperature T6 which is still slightly above the melting temperature T7 of the thermoplastic material 14 wetting all the fibers.
  • An arranged behind the cooling table 10 cutting device in the form of a knife 23 separates sections of predetermined length than prepregs 20 from this endless strand 11 from.
  • the prepregs 20 are then stored on convexly curved storage surfaces or transported to a molding press 24.
  • a leaf spring 25 with the lowest possible plastic content, the highest possible fiber content and no boundary layers in the plastic, the stack with the prepreg layers 20 ', 20 ", 20'” subjected during pressing a temperature treatment in of Fig. 2 is illustrated. Accordingly, at the latest after the closing of the molding press in a period t ⁇ to t1, the temperature of the prepreg layers 20 ', 20 ", 20'” raised to a value which is above the melting temperature T7 of all fibers wetting thermoplastic material 14 and up to a time t3 is maintained.
  • thermoplastic material 14 is kept molten or remelted, so that excess plastic can escape under the pressure from the prepreg layers 20 ', 20 ", 20'” and leave the molding press 24. If necessary, trapped air also exits the molded body. Since the Abdeckmaterialbahnen 3 and 4 consist of a thermoplastic material whose melting temperature T8 is above the melting temperature of that thermoplastic resin 14, with which all the fibers of the fiber strand 2 were wetted, they remain mechanically intact initially.
  • a lowering of the temperature of the pre-preg layers 20 ', 20 ", 20'” beginning just at the time t2 just below the melting temperature T7 of the plastic 14 in the period t3 to t4 can be used as a ripening phase, if desired or necessary.
  • the temperature of the prepreg layers 20 ', 20 ", 20'” in a period t4 to t6 raised to a value which is above the melting temperature T7 of that thermoplastic resin 14, with which all the fibers of the fiber strand 2 are wetted , And also in a sufficiently long period around the time t5 around the melting temperature T8 of the thermoplastic material of the two Abdeckmateriallagen 3, 4 exceeds.
  • the material melts the Abdeckmateriailagen 3 and 4, so that this thermoplastic material with the other thermoplastic material 14 under the pressure of the molding press 24 merges molten.
  • T1 Mean temperature of the input-side section 16
  • T2 Mean temperature of materials in heating zone S1
  • T3 Mean temperature of materials in heating zone S2
  • T4 Mean temperature of materials in heating zone S3

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Composite Materials (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Inorganic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Moulding By Coating Moulds (AREA)
  • Springs (AREA)

Abstract

L'invention concerne un procédé de production d'un ressort à lames à partir d'un matériau composite fibreux avec une matière thermoplastique, et un ressort à lames (25) ainsi fabriqué. En vue d'obtenir de façon économique un tel ressort à lames (25) d'une haute qualité, l'invention est caractérisée en ce qu'elle comprend les étapes suivantes : fusion d'une matière thermoplastique (14); mouillage, avec la matière plastique fondue (14), d'un faisceau de fibres (2) constitué de fibres orientées au moins parallèlement entre elles; recouvrement du faisceau de fibres (2), à sa partie supérieure et à sa partie inférieure, par au moins une bande de matériau de recouvrement (3, 4), le faisceau de fibres imprégné de matière plastique (2) étant guidé, conjointement avec au moins une bande de matériau de recouvrement (3, 4) sur une plaque chauffante (6) incurvée convexe et chauffée; sectionnement du faisceau de fibres (2) recouvert par au moins une bande de matériau de recouvrement (3, 4) et imprégné de matière plastique, de manière à former des pré-imprégnés (20) de longueurs prédéterminées; mise en place d'un nombre prédéterminé de couches de pré-imprégnés (20', 20'', 20''') sur une surface de dépôt d'une presse à mouler chauffante (24); et compression des couches de pré-imprégnés (20', 20'', 20''') dans la presse à mouler (24), sous l'effet de profils de température et de pression, prédéterminés et dépendants du matériau, en fonction du temps, de façon qu'on obtienne, après compression, un ressort à lames en un matériau fibreux composite durci.
PCT/DE2007/001842 2006-11-06 2007-10-16 Procédé de production d'un ressort à lames en un matériau composite fibreux avec une matière thermoplastique WO2008055459A2 (fr)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
DE102006052137A DE102006052137B4 (de) 2006-11-06 2006-11-06 Verfahren zur Herstellung von Blattfedern aus einem Faserverbundwerkstoff
DE102006052136A DE102006052136B4 (de) 2006-11-06 2006-11-06 Verfahren und Vorrichtung zur kontinuierlichen Herstellung von Prepregs
DE102006052137.4 2006-11-06
DE102006052136.6 2006-11-06
DE102007003596A DE102007003596B4 (de) 2007-01-25 2007-01-25 Verfahren zur Herstellung einer Blattfeder aus einem Faserverbundwerkstoff mit einem thermoplastischen Kunststoff
DE102007003596.0 2007-01-25

Publications (2)

Publication Number Publication Date
WO2008055459A2 true WO2008055459A2 (fr) 2008-05-15
WO2008055459A3 WO2008055459A3 (fr) 2008-07-03

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PCT/DE2007/001842 WO2008055459A2 (fr) 2006-11-06 2007-10-16 Procédé de production d'un ressort à lames en un matériau composite fibreux avec une matière thermoplastique

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102958682A (zh) * 2010-07-30 2013-03-06 维斯塔斯风力系统有限公司 对树脂浸渍的纤维片材的冷却机械加工
CN103692665A (zh) * 2013-12-18 2014-04-02 上海日之升新技术发展有限公司 连续长玻璃纤维增强ppo生产用玻璃纤维束反应型熔融浸润装备及浸润方法
CN104602863A (zh) * 2012-06-25 2015-05-06 维斯塔斯风力系统有限公司 用于在包括纤维材料的板材上提供锥形边缘的方法以及设备
US9573432B2 (en) 2013-10-01 2017-02-21 Hendrickson Usa, L.L.C. Leaf spring and method of manufacture thereof having sections with different levels of through hardness
CN111136936A (zh) * 2020-01-08 2020-05-12 南京航空航天大学 一种多角度铺层设计帽形长桁预浸料拉挤成型装置
CN113478868A (zh) * 2021-05-25 2021-10-08 杨维武 一种层切式复合材料板簧生产装置

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Cited By (10)

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CN102958682A (zh) * 2010-07-30 2013-03-06 维斯塔斯风力系统有限公司 对树脂浸渍的纤维片材的冷却机械加工
CN102958682B (zh) * 2010-07-30 2016-01-20 维斯塔斯风力系统有限公司 对树脂浸渍的纤维片材的冷却机械加工
CN104602863A (zh) * 2012-06-25 2015-05-06 维斯塔斯风力系统有限公司 用于在包括纤维材料的板材上提供锥形边缘的方法以及设备
US9573432B2 (en) 2013-10-01 2017-02-21 Hendrickson Usa, L.L.C. Leaf spring and method of manufacture thereof having sections with different levels of through hardness
US9890440B2 (en) 2013-10-01 2018-02-13 Hendrickson Usa, L.L.C. Leaf spring and method of manufacture thereof having sections with different levels of through hardness
CN103692665A (zh) * 2013-12-18 2014-04-02 上海日之升新技术发展有限公司 连续长玻璃纤维增强ppo生产用玻璃纤维束反应型熔融浸润装备及浸润方法
CN103692665B (zh) * 2013-12-18 2016-08-17 上海日之升科技有限公司 连续长玻璃纤维增强ppo生产用玻璃纤维束反应型熔融浸润装备及浸润方法
CN111136936A (zh) * 2020-01-08 2020-05-12 南京航空航天大学 一种多角度铺层设计帽形长桁预浸料拉挤成型装置
CN113478868A (zh) * 2021-05-25 2021-10-08 杨维武 一种层切式复合材料板簧生产装置
CN113478868B (zh) * 2021-05-25 2023-05-05 贵州石鑫玄武岩科技有限公司 一种层切式复合材料板簧生产装置

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