WO1994021438A1 - Procede et noyau de fabrication d'un corps moule ou profile creux en matiere plastique renforcee par des fibres - Google Patents

Procede et noyau de fabrication d'un corps moule ou profile creux en matiere plastique renforcee par des fibres Download PDF

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Publication number
WO1994021438A1
WO1994021438A1 PCT/EP1994/000795 EP9400795W WO9421438A1 WO 1994021438 A1 WO1994021438 A1 WO 1994021438A1 EP 9400795 W EP9400795 W EP 9400795W WO 9421438 A1 WO9421438 A1 WO 9421438A1
Authority
WO
WIPO (PCT)
Prior art keywords
core
jacket
molded body
core body
mold
Prior art date
Application number
PCT/EP1994/000795
Other languages
German (de)
English (en)
Inventor
Wolfgang Frank
Original Assignee
Wolfgang Frank
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 Wolfgang Frank filed Critical Wolfgang Frank
Publication of WO1994021438A1 publication Critical patent/WO1994021438A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62K—CYCLES; CYCLE FRAMES; CYCLE STEERING DEVICES; RIDER-OPERATED TERMINAL CONTROLS SPECIALLY ADAPTED FOR CYCLES; CYCLE AXLE SUSPENSIONS; CYCLE SIDE-CARS, FORECARS, OR THE LIKE
    • B62K19/00—Cycle frames
    • B62K19/02—Cycle frames characterised by material or cross-section of frame members
    • B62K19/16—Cycle frames characterised by material or cross-section of frame members the material being wholly or mainly of plastics
    • 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
    • B29C70/44—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using isostatic pressure, e.g. pressure difference-moulding, vacuum bag-moulding, autoclave-moulding or expanding rubber-moulding
    • B29C70/446—Moulding structures having an axis of symmetry or at least one channel, e.g. tubular structures, frames
    • 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
    • B29C33/0011—Moulds or cores; Details thereof or accessories therefor thin-walled moulds
    • B29C33/0016—Lost moulds, e.g. staying on the moulded object
    • 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
    • B29L2012/00—Frames
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/30—Vehicles, e.g. ships or aircraft, or body parts thereof
    • B29L2031/3091—Bicycles

Definitions

  • V experienced and core body for the production of a hollow shape ⁇ or profile body made of fiber-reinforced plastic
  • the invention relates to a method for producing a hollow molded body according to claim 1, to a core body for use in this method according to claim 16 and to a two-wheel frame which can be produced by the method according to claim 20.
  • the invention is therefore based on the object of providing a method for providing a two-wheeled frame and a core body, in which the manufacture and handling of a molded body blank or molded body wrapped with fiber material can be carried out simply and reliably with a minimal weight.
  • the fiber orientation can be chosen according to the requirements and the loads.
  • the molded body blank created in this way is inherently rigid due to the core body and can e.g. B. when inserted into a divisible form can be handled well without the
  • Shaped body blank is damaged.
  • the surface of the jacket offers a particularly good adhesive base for the fiber material winding, so that the production of the shaped body blank is made considerably easier.
  • Curing takes place with the jacket inflated and by the action of pressure and heat.
  • the sleeve made of fiber material is detached from the core and pressed against the wall of the press mold. This ensures a clean separation between the jacket with the fiber material casing and the mandrel.
  • the method enables the production of coreless hollow molded articles made of fiber-reinforced plastic, the reject rate during production caused by improper winding of the fiber material or improper handling of the molded article blank being minimized.
  • the method according to the invention is particularly suitable for use in the manufacture of a bicycle frame which is characterized by low weight and high strength.
  • the method according to the invention is not only suitable for use on two-wheeled frames, but it is also suitable for the manufacture of all hollow-loaded, highly stressed components, such as two-wheeled handlebars, two-wheeled frames, tennis rackets, swimming boards and similar objects.
  • wax as a fusible material for the core with a melting temperature of preferably 80 ° C to 140 ° C, a simple melting of the core is ensured on the one hand and on the other hand the hardened plastic material is only exposed to low thermal stress due to the relatively low temperature.
  • the manufacture of the core body is particularly easy and exactly reproducible.
  • the sheath can be removed after the core has melted, it can be reused so that the manufacturing process can be carried out more economically.
  • Fig. 1 shows a partially cut two-wheel handlebar with molded steering tube, which can be produced by the method according to the invention.
  • Fig. 2 shows a side view of a one-piece two-wheel frame, which is produced by the inventive method.
  • Fig. 1 is a two-wheel link blank with molded
  • Steering tube shown how it is inserted into a mold for curing.
  • the interior of the two-wheel control arm is filled with a core body 1, which consists of a fusible core 2 and a tube 3 surrounding the fusible core 2.
  • Fiber materials for example so-called prepregs, are wound around the core body 1 and later form the shaped body.
  • a divisible auxiliary form (not shown), the inner surface of which has the shape of the core 2 of the two-wheel control arm, is made with a fusible core material such as e.g. Poured hard wax. After the core 2 has cooled or solidified, it is removed from this auxiliary form.
  • a fusible core material such as e.g. Poured hard wax.
  • the core 2 is covered with a gas-tight tube 3.
  • a suitable hose material such as latex or silicone rubber
  • a pre-assembled hose can also be used, which either comes from a previous application of the method according to the invention or which is obtained in a separate manufacturing process, which should not be discussed here.
  • the core 2 surrounded by the tube 3 forms the actual core body 1.
  • the tube 3 surrounding the core body 1 is extended on the handlebar tube of the two-wheel handlebar and has an opening 5 which can be closed by a valve (not shown).
  • the core body 1 is then wrapped with synthetic resin-impregnated fiber fabric 4, preferably carbon fibers, so-called prepregs.
  • the fiber fabric can be closely formed around the core body 1. Areas subject to higher stress can be reinforced by multiple layers of fibers and / or stabilized by other materials etc. Furthermore, inserts such as fastening elements for fastening the handlebar can be molded in. The molded body blank produced in this way is easy to handle due to the rigidity of the core body 1.
  • the molded body blank is now placed in a divisible mold (not shown), the inner surface of which has the shape of the outer surface of the molded body. Due to the stability of the molded body blank, the risk of wrinkling in the fiber material during insertion into the mold is very low.
  • the tube 3 is inflated so that the fiber material is pressed against the inner surface of the mold.
  • the hose 3 and the fiber winding detach from the core 2.
  • the inner surfaces of the mold can be heated so that the fiber-reinforced plastic hardens under the action of heat and pressure.
  • the molded body is removed from the mold.
  • the core can be melted by the action of heat during the pressing process or in a further process step and discharged as a liquid medium through the hose opening 5.
  • the draining of the liquid core material can be assisted by applying negative pressure to the hose opening 5.
  • the negative pressure further promotes the detachment of the hose 3 from the Inner surface of the molded body.
  • the hose 3 is thereby easier to pull out of the molded body.
  • the detachment of the tube 3 from the molded body can be further facilitated by treating the outer surface of the core body 1 with a release agent before wrapping it with fiber material.
  • the two-wheel handlebar with the molded steering tube which is the molded body, is essentially finished after the pressing, the stable core ensuring during the pressing process that the hollow body has defined wall thicknesses with a predetermined inner surface structure, which leads to superior strength values compared to known solutions and postprocessing as far as possible superfluous.
  • the hose 3 obtained in the above-described method can be used again to produce the next molded body.
  • the core body 1 is produced by filling the tube 3 with molten core material in an auxiliary form.
  • FIG. 2 shows a partially cut two-wheel frame which is constructed from a one-piece hollow profile structure with receiving sections for bottom bracket 6, steering head bearing 7, seat post 8 and rear wheel 9.
  • the core body 1 necessary for the two-wheel frame is made up of a plurality of partial core bodies la, lb, lc, each of which has a fusible core 2 surrounded by a tube 3 and, when joined together, results in the complete core body 1.
  • the division chosen here is only an example. Of course, other divisions or a one-piece mold core are adjustable.
  • the partial core bodies la, lb, lc lie closely together at their abutment points and / or overlap one another.
  • the core body 1 constructed from partial core bodies 1 a, 1 b, 1 c is, as in the exemplary embodiment described above, also wrapped with prepregs, the materials used and the layer thickness being freely selectable depending on the strength, so that the winding layers can lie one above the other several times at highly stressed locations .
  • the two-wheel frame which is a relatively complex shaped body, has a core body 1, the partial core bodies la, lb, lc of which do not encompass any closed profile structure of the bicycle frame, so that each tube 3 belonging to a partial core body la, lb, lc after the respective core 2 has melted out via appropriate frame openings such as bottom bracket, Steering head bearing or seat post opening 6, 7, 8 is removable.
  • an integrally formed core body 1 is used.
  • the core 2, which consists of meltable material is produced in a divisible auxiliary form and then coated with a thin, air-impermeable, elastic layer.
  • the resulting tube 3 has extensions 5 for pumping on the various frame openings such as bottom bracket, seat post and steering head bearing openings 6, 7, 8.
  • the hose 3 must remain in the two-wheeled frame. So that the tube 3 forms a bond with the inner surface of the bicycle frame, the tube 3 can be treated on the outer surface with an adhesive agent.
  • an adhesive agent In this example, a composite body consisting of the hardened hollow plastic profile and the hose would result.
  • a core material made of wax or hard wax or similar fusible material is preferably used in the above-described methods, the melting point of which is at a temperature of 40 ° C. to 200 ° C., preferably 80 ° C. to 140 ° C.
  • the surface of the hose 3 can be treated with a release agent.
  • further shaping insert parts can be inserted into the divisible mold in which the shaped body blank is hardened.
  • reinforcing elements made of other materials, such as metal can either be inserted into the divisible mold so that they form a bond with the reactive plastic, or specially shaped receiving sections are formed on the molded body, on which the corresponding bearing bushes, receptacles, etc be attached.
  • the new process described thus enables simple, precise production of even complicated hollow body geometries, which are characterized by low weight and excellent strength.
  • a method for producing a hollow molded body from fiber-reinforced reactive plastic in which an inherently rigid core body is used, which consists of a fusible core and a thin elastic gas-tight layer arranged around the fusible core.
  • a shaped body blank is created by wrapping impregnated fiber material around the solid core body, preferably with prepregs.
  • the molded body blank which is inherently rigid due to the core body, is easy to handle without the risk of wrinkling and can be inserted into a separable mold.
  • the elastic layer in the form of a tube is inflated through an opening so that the fiber material is pressed against the inner wall of the mold and at the same time the tube is lifted off the fusible core.
  • the molded body blank is heated via the heated inner wall of the press mold so that the fiber-reinforced plastic hardens under pressure and heat. After the hardening process, the core material is melted either by the heat of the mold or by separate heating drained through the hose opening. Then the complete hose can be pulled out of the opening.

Abstract

Selon un procédé de fabrication d'un corps moulé creux en une matière plastique réactive renforcée par des fibres, on utilise un noyau rigide en soi (1), constitué d'un noyau fusible (2) et d'une mince couche élastique (3) étanche aux gaz qui entoure le noyau fusible. On produit une ébauche de corps moulé en enroulant un matériau fibreux imprégné (4), de préférence du préimprégné, autour du noyau solide. On peut aisément manipuler l'ébauche de corps moulé rendue rigide par le noyau, sans danger de plissage, et la déposer dans un moule séparable. Une fois que le moule est fermé, la couche élastique sous forme d'un tuyau flexible est gonflée sur l'ébauche à travers une ouverture, de sorte que le matériau fibreux soit comprimé contre la paroi intérieure du moule et en même temps le tuyau flexible soit séparé du noyau fusible. L'ébauche de corps moulé est chauffée par la paroi intérieure chauffable du moule afin d'entraîner le durcissement de la matière plastique renforcée par des fibres sous l'effet de la pression et de la chaleur. Après le durcissement, le matériau du noyau fondu par la chaleur du moule ou par échauffement séparé est évacué par l'ouverture du tuyau. Le tuyau peut ensuite être retiré dans sa totalité à travers l'ouverture.
PCT/EP1994/000795 1993-03-16 1994-03-15 Procede et noyau de fabrication d'un corps moule ou profile creux en matiere plastique renforcee par des fibres WO1994021438A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19934308370 DE4308370C2 (de) 1993-03-16 1993-03-16 Verfahren und Kernkörper zur Herstellung eines hohlen Form- oder Profilkörpers aus faserverstärktem Kunststoff
DEP4308370.6 1993-03-16

Publications (1)

Publication Number Publication Date
WO1994021438A1 true WO1994021438A1 (fr) 1994-09-29

Family

ID=6482962

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1994/000795 WO1994021438A1 (fr) 1993-03-16 1994-03-15 Procede et noyau de fabrication d'un corps moule ou profile creux en matiere plastique renforcee par des fibres

Country Status (2)

Country Link
DE (1) DE4308370C2 (fr)
WO (1) WO1994021438A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005039906A1 (de) * 2005-08-24 2007-03-01 Dr.Ing.H.C. F. Porsche Ag Verfahren zum Herstellen eines Faserverbundbauteils
DE102017100621A1 (de) 2017-01-13 2018-07-19 Teufelberger Ges.M.B.H. Formstück
DE102018211793A1 (de) * 2018-07-16 2020-01-16 Sgl Carbon Se Verfahren zur Herstellung eines Hohlprofils mit veränderlichen Krümmungen und Querschnitten
US20210170700A1 (en) * 2019-12-06 2021-06-10 Argonaut, LLC Fiber-composite bicycle frame article formed on molded mandrel
CN113518699A (zh) * 2019-03-08 2021-10-19 三菱化学株式会社 纤维增强树脂制品的制造方法和型芯

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19640955A1 (de) * 1996-10-04 1998-04-16 Thomas Mueller Hohlkörperprofil und Verfahren zu dessen Herstellung
DE19754378A1 (de) * 1997-12-09 1999-06-17 Thermoplastik Erich Mueller Gm Verfahren zum Herstellen eines Rahmens für Zweiräder
DE10233697B4 (de) * 2002-12-05 2005-06-16 East-4D-Gmbh Lightweight Structures Zentrifugenrotor in Wickeltechnik
DE102005020274A1 (de) * 2005-04-30 2006-11-02 Denk Engineering Gmbh Verfahren zur Herstellung eines faserverstärkten Kunststoff-Formteils
DE102006004169A1 (de) * 2006-01-27 2007-08-09 Canyon Bicycles Gmbh Fahrrad-Tragstruktur
DE102011113200B4 (de) * 2011-09-10 2017-10-12 Volkswagen Aktiengesellschaft Verfahren zur Herstellung eines Hohlprofilknotens aus einem Faser-Kunststoff-Verbund für die Verbindung von Hohlprofilbauteilen eines Rahmenelements
DE102015225656A1 (de) * 2015-12-17 2017-06-22 Bayerische Motoren Werke Aktiengesellschaft Verfahren zur Herstellung eines faserverstärkten Hohlprofil-Bauteils
DE102015225659A1 (de) * 2015-12-17 2017-06-22 Bayerische Motorenwerke Aktiengesellschaft Verfahren zur Herstellung eines faserverstärkten Hohlprofil-Bauteils
CN117301386A (zh) * 2023-09-16 2023-12-29 浙江锋鸟车业有限公司 一种车架生产工艺

Citations (7)

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Publication number Priority date Publication date Assignee Title
GB2096530A (en) * 1981-04-04 1982-10-20 Ver Flugtechnische Werke A tubular hollow member and a method for its manufacture and a device for carrying out the method
US4389367A (en) * 1981-09-30 1983-06-21 Grumman Aerospace Corporation Fluid molding system
FR2532581A1 (fr) * 1982-09-07 1984-03-09 Fischer Gmbh Corps creux tubulaire pour la transmission des efforts de compression, de traction et de torsion, procede pour sa fabrication et dispositif pour l'application du procede decrit
WO1989004789A1 (fr) * 1987-11-20 1989-06-01 Trimble Brent J Cadres de bicyclette composites et procedes de production
EP0399075A1 (fr) * 1989-05-24 1990-11-28 Look S.A. Cadre de bicyclette et son procédé de fabrication
FR2669573A1 (fr) * 1988-11-10 1992-05-29 Alkan R & Cie Procede de fabrication de pieces creuses en materiau composite drape, et appareillage pour la mise en óoeuvre de ce procede.
GB2250466A (en) * 1990-12-05 1992-06-10 Taylor Made Golf Co Moulding a hollow golf club shaft from composite fibre/resin material

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CH148560A (de) * 1930-01-13 1931-07-31 Alfred Prof Dr Schmid Verfahren zur Herstellung von Giessformen, insbesondere für Kunstharze.
DE2746173C3 (de) * 1977-10-14 1981-10-29 Dornier Gmbh, 7990 Friedrichshafen Vorrichtung zur Herstellung von Bauteilen aus faserverstärkten Kunststoffen
JPS5630824A (en) * 1979-08-24 1981-03-28 Toyota Motor Corp Preparation of fiber reinforced hollow part
DE4230469C1 (de) * 1992-09-11 1994-04-21 Guenter Zillner Verfahren zur Herstellung von hohlförmigen Kunststofformteilen aus Faserverbundwerkstoffen

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2096530A (en) * 1981-04-04 1982-10-20 Ver Flugtechnische Werke A tubular hollow member and a method for its manufacture and a device for carrying out the method
US4389367A (en) * 1981-09-30 1983-06-21 Grumman Aerospace Corporation Fluid molding system
FR2532581A1 (fr) * 1982-09-07 1984-03-09 Fischer Gmbh Corps creux tubulaire pour la transmission des efforts de compression, de traction et de torsion, procede pour sa fabrication et dispositif pour l'application du procede decrit
WO1989004789A1 (fr) * 1987-11-20 1989-06-01 Trimble Brent J Cadres de bicyclette composites et procedes de production
FR2669573A1 (fr) * 1988-11-10 1992-05-29 Alkan R & Cie Procede de fabrication de pieces creuses en materiau composite drape, et appareillage pour la mise en óoeuvre de ce procede.
EP0399075A1 (fr) * 1989-05-24 1990-11-28 Look S.A. Cadre de bicyclette et son procédé de fabrication
GB2250466A (en) * 1990-12-05 1992-06-10 Taylor Made Golf Co Moulding a hollow golf club shaft from composite fibre/resin material

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005039906A1 (de) * 2005-08-24 2007-03-01 Dr.Ing.H.C. F. Porsche Ag Verfahren zum Herstellen eines Faserverbundbauteils
DE102005039906B4 (de) * 2005-08-24 2010-08-19 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Verfahren zum Herstellen eines Faserverbundbauteils
DE102017100621A1 (de) 2017-01-13 2018-07-19 Teufelberger Ges.M.B.H. Formstück
WO2018130640A1 (fr) 2017-01-13 2018-07-19 Teufelberger Ges.M.B.H. Pièce moulée
DE102018211793A1 (de) * 2018-07-16 2020-01-16 Sgl Carbon Se Verfahren zur Herstellung eines Hohlprofils mit veränderlichen Krümmungen und Querschnitten
CN113518699A (zh) * 2019-03-08 2021-10-19 三菱化学株式会社 纤维增强树脂制品的制造方法和型芯
CN113518699B (zh) * 2019-03-08 2023-07-04 三菱化学株式会社 纤维增强树脂制品的制造方法和型芯
US20210170700A1 (en) * 2019-12-06 2021-06-10 Argonaut, LLC Fiber-composite bicycle frame article formed on molded mandrel
US11745441B2 (en) * 2019-12-06 2023-09-05 Argonaut, LLC Fiber-composite bicycle frame article formed on molded mandrel

Also Published As

Publication number Publication date
DE4308370A1 (de) 1994-09-22
DE4308370C2 (de) 1996-01-11

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