WO1992008594A1 - Procede et appareil de production d'elements moules sur des noyaux a expansion thermique - Google Patents

Procede et appareil de production d'elements moules sur des noyaux a expansion thermique Download PDF

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Publication number
WO1992008594A1
WO1992008594A1 PCT/GB1991/002009 GB9102009W WO9208594A1 WO 1992008594 A1 WO1992008594 A1 WO 1992008594A1 GB 9102009 W GB9102009 W GB 9102009W WO 9208594 A1 WO9208594 A1 WO 9208594A1
Authority
WO
WIPO (PCT)
Prior art keywords
support
mandrel
tube
curable material
component
Prior art date
Application number
PCT/GB1991/002009
Other languages
English (en)
Inventor
Matthew Readman
Original Assignee
The University Of Manchester Institute Of Science & Technology
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 The University Of Manchester Institute Of Science & Technology filed Critical The University Of Manchester Institute Of Science & Technology
Publication of WO1992008594A1 publication Critical patent/WO1992008594A1/fr
Priority to GB9309736A priority Critical patent/GB2266263B/en

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
    • B29C33/76—Cores
    • 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
    • B29C33/44—Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles
    • 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
    • B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
    • B29C53/80—Component parts, details or accessories; Auxiliary operations
    • B29C53/82—Cores or mandrels
    • B29C53/821—Mandrels especially adapted for winding and joining
    • B29C53/824—Mandrels especially adapted for winding and joining collapsible, e.g. elastic or inflatable; with removable parts, e.g. for regular shaped, straight tubular articles
    • 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
    • B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
    • B29C53/80—Component parts, details or accessories; Auxiliary operations
    • B29C53/84—Heating or cooling
    • B29C53/845—Heating or cooling especially adapted for winding and joining
    • 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
    • B29C61/00—Shaping by liberation of internal stresses; Making preforms having internal stresses; Apparatus therefor

Definitions

  • a method and an apparatus for the manufacture of moulded components on thermally expandable cores are provided.
  • the present invention relates to the manufacture of moulded components, for example tubes formed from composite materials.
  • Composite ' tubes are well known in the art. Such tubes are made from a matrix of polyester resin, epoxy resin or the like and reinforcement such as woven or unwoven fibre. To construct the tube the reinforcement is wrapped around a mandrel and impregnated with resin in a liquid state. This can be done by hand or mechanically. For example, the mandrel may be rotated as re ' sin impregnated fibres are applied. The resin or matrix is then allowed to set or cure and after curing the mandrel is removed leaving the composite tube. In order to facilitate removal of the composite tube from the mandrel a release agent is applied to the mandrel prior to the wrapping of the matrix and reinforcement. During curing of the matrix the composite tube will shrink onto the mandrel. Shrinkage and physical or chemical adhesion makes the removal of the mandrel very difficult, and as a result the mandrel and/or the tube can be damaged.
  • a method for moulding a component wherein component-forming curable material is deposited on a surface of a support formed • from a material exhibiting viscoelastic properties, the curable material when cured and the support having different coefficients of thermal expansion, the curable material is cured on the support, the support is heated whilst restrained against displacement relative to the cured material, and the support is cooled whilst not restrained against relative displacement between the support surface and the cured material.
  • curable material is used herein to mean any material which can be deposited in liquid form and subsequently hardens to form a dimensionally stable structure. Examples are resin, plaster, concrete, plastics and rubber based materials.
  • material exhibiting viscoelastic properties is used herein to mean any material in which compressive stresses induced by heating the material when it is constrained against expansion relax at least partially such that when the material is subsequently cooled it contracts to a size which is less than the size to which it was constrained during heating.
  • the material from which the support is made has non-adhesive properties to prevent adhesion of the curable material to the support.
  • a release agent may be applied to the mandrel before the resin is applied.
  • the material exhibiting viscoelastic properties may be for example polypropylene.
  • a tube may be formed in accordance with the present invention by wrapping tube-forming material around a mandrel formed from the material exhibiting viscoelastic properties, curing the tube-forming material on the mandrel, heating the mandrel, subsequently cooling the mandrel, and removing the cured tube from the mandrel.
  • the tube-forming material has a smaller coefficient of thermal expansion than the mandrel, and thus thermal expansion of the mandrel is restrained as the mandrel is heated. When subsequently cooled, it contracts to a size that is less than its original size, and thus the cured tube can be readily removed.
  • the mandrel incorporates a heating means, e.g. a resistive electrical heater.
  • a heating means e.g. a resistive electrical heater.
  • means are provided for expanding the mandrel after use to return it to its dimensions before use. For example, excess internal pressure may be applied to the mandrel when it is heated and enclosed in a rigid tube the internal diameter of which is slightly greater than the initial outside diameter of the mandrel. When the mandrel is subsequently cooled it will then contract to its initial outside diameter.
  • said mandrel has stepped end portions of enlarged diameter to provide for consistent stressing of said tube.
  • one of said stepped end portions is removable to allow said mandrel to be removed.
  • a moulded component manufactured in accordance with the method as hereinbefore defined.
  • moulded component forming apparatus comprising means for moulding curable material on a support exhibiting viscoelastic properties, means for heating the support, and means for cooling the support to facilitate the removal of the component from the support.
  • Figure 1 is a section through a mandrel used in accordance with the present invention to form a tube and a tube formed on the mandrel;
  • Figure 2 is a section through the mandrel and tube of Figure 1 after heating and cooling;
  • Figure 3 is a section through an improved mandrel in accordance with the present invention.
  • the mandrel 1 is constructed from, for example, polypropylene tubing. This is a thermoplastic that is viscoelastic.
  • the tube 2 is wound around the mandrel without a release agent being previously applied to the mandrel.
  • the composite tube 2 is formed from a matrix of resin, for example, epoxy resin, and a reinforcement material such as fibre which may be woven or unwoven.
  • the fibre may be glass, boron, polyamide or other fibres capable of reinforcing composite tubes.
  • the mandrel 1 and composite tube 2 are heated, for example, in an oven at a temperature of around 70 - 80°C. This heating step may be initiated before the tube is cured to accelerate curing. Heating causes the mandrel 1 and the tube 2 to expand. The expansion to the composite tube 2 is very small and thus constrains the relatively larger expansion of the mandrel 1. Constraining expansion of the mandrel 1 causes circumferential compressive stresses to be set up in the mandrel 1. These compressive stresses are relaxed at the elevated temperature. The amount of stress relaxation depends upon the temperature and length of time the temperature is maintained.
  • Compressive stress is only applied to the mandrel 1 where it is constrained.
  • the composite tube 2 is shorter in length than the mandrel 1 and thus there is part of the mandrel 1 at either end that is not stress relaxed.
  • a cut is made through the composite tube 2 and the mandrel 1 at one end so that the tube 2 can then be removed from the mandrel 1 at that end. Given the contraction of the mandrel 1 relative to the tube 2, this is easily achieved.
  • a release agent could be applied to the mandrel, but this is not generally necessary.
  • Figure 3 shows another example of a mandrel 1.
  • the mandrel 1 again is formed from a viscoelastic material. It has an integrated heater 3 in the form of a resistive heating wire and glass fibres are laid unidirectionally along the axis of the tube to give it axial stiffness.
  • the integrated heater 3 is wound circumferentially within the thickness of the mandrel 1.
  • the ends of the mandrel 1 are sealed to allow it to be pressurized from the inside.
  • Both ends of the mandrel 1 are stepped so as to have a greater outside diameter than that of the remainder of the mandrel 1 on which the composite tube (not shown) is wound.
  • One end 4 of the mandrel 1 is made detachable to enable the tube 2 to be removed without cutting the mandrel 1. After removal, the ends of the tube can be trimmed to remove parts of the tube formed on the stepped ends.
  • the diameter of the mandrel 1 can then be returned to its original size by heating the mandrel 1 through the integrated heater 3 and pressurizing the interior of the mandrel 1 via a pressure connector 5. This is done whilst the mandrel 1 is placed within another tube (not shown) of slightly larger internal diameter than the initial mandrel diameter. When the mandrel 1 is cooled it will thus contract to the initial diameter required to make the next composite tube 2.
  • Figure 3 shows one end 6 of the mandrel 1 having a protruding housing and electrical plug 7 which is used to supply electricity to the heater 3.
  • a temperature sensor 8 is also provided within the mandrel 1 to gauge when the appropriate temperature has been reached during the heating processes.
  • tubes can be manufactured from plaster of Paris which may be reinforced with glass fibres.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Photoreceptors In Electrophotography (AREA)
  • Moulding By Coating Moulds (AREA)

Abstract

Procédé et appareil de production d'éléments moulés, dans lesquels un matériau de cuisson pour la formation d'éléments (2) est placé sur la surface d'un support (1). Ledit support (1) est formé d'un matériau ayant des propriétés visco-élastiques et dont le coefficient d'expansion thermique est supérieur à celui du matériau de cuisson. Un dispositif de chauffage (8), par exemple une résistance chauffante électrique, sert à chauffer le support (1) qui ne peut se déplacer, en raison d'un dispositif de contrainte, par rapport au matériau de cuisson. On enlève ensuite ledit dispositif de contrainte, on fait refroidir le support, et on retire l'élément vulcanisé (2). Etant donné que le coefficient d'expansion thermique du matériau de cuisson est inférieur à celui du support (1), l'expansion thermique du support est empêchée pendant qu'il est chauffé. Ainsi, lorsqu'il se refroidit ensuite, il se contracte et prend une dimension plus petite que sa dimension d'origine, de sorte que l'élément vulcanisé (2) peut être aisément retiré.
PCT/GB1991/002009 1990-11-14 1991-11-14 Procede et appareil de production d'elements moules sur des noyaux a expansion thermique WO1992008594A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9309736A GB2266263B (en) 1990-11-14 1993-05-12 A method and an apparatus for the manufacture of moulded components on thermally expandable cores

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9024789.1 1990-11-14
GB909024789A GB9024789D0 (en) 1990-11-14 1990-11-14 Manufacture of moulded components

Publications (1)

Publication Number Publication Date
WO1992008594A1 true WO1992008594A1 (fr) 1992-05-29

Family

ID=10685385

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1991/002009 WO1992008594A1 (fr) 1990-11-14 1991-11-14 Procede et appareil de production d'elements moules sur des noyaux a expansion thermique

Country Status (3)

Country Link
AU (1) AU8866491A (fr)
GB (2) GB9024789D0 (fr)
WO (1) WO1992008594A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2089965A2 (es) * 1994-01-20 1996-10-01 Torres Martinez M Procedimiento de fabricacion de perfiles aerodinamicos para palas de aerogeneradores, aerodinos y similares.
EP2327526A1 (fr) * 2009-11-27 2011-06-01 Eurocopter Deutschland GmbH Noyau de moule comprenant une partie soluble et une partie non soluble
WO2013005063A1 (fr) * 2011-07-06 2013-01-10 Ante Vukovic Système de surveillance et de commande automatiques de production et de finition de tuyaux de matière plastique enroulés en spiral
WO2013087775A1 (fr) * 2011-12-16 2013-06-20 Robert Bosch Gmbh Procédé de bobinage pour fabriquer une ébauche de corps creux en forme de tube à symétrie de révolution, dispositif et procédé de fabrication d'un dispositif pour sa fabrication
US10183420B2 (en) 2016-02-15 2019-01-22 General Electric Company Resistively heated thermoplastic washout mandrel

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995020104A1 (fr) * 1994-01-20 1995-07-27 Torres Martinez, Manuel Fabrication de profils aerodynamiques

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2739350A (en) * 1952-01-28 1956-03-27 Northrop Aircraft Inc Method and means of molding
EP0415207A2 (fr) * 1989-08-29 1991-03-06 The Yokohama Rubber Co., Ltd. Procédé pour fabriquer des objets creux thermoplastiques renforcés de fibres

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2739350A (en) * 1952-01-28 1956-03-27 Northrop Aircraft Inc Method and means of molding
EP0415207A2 (fr) * 1989-08-29 1991-03-06 The Yokohama Rubber Co., Ltd. Procédé pour fabriquer des objets creux thermoplastiques renforcés de fibres

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
Derwent's abstract, No. 90-275 015/36, WO 9 009 272, publ. week 9036 *
Patent Abstracts of Japan, Vol 13, No 194, M823, abstract of JP 62-179565, publ 1989-01-25 *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2089965A2 (es) * 1994-01-20 1996-10-01 Torres Martinez M Procedimiento de fabricacion de perfiles aerodinamicos para palas de aerogeneradores, aerodinos y similares.
EP2327526A1 (fr) * 2009-11-27 2011-06-01 Eurocopter Deutschland GmbH Noyau de moule comprenant une partie soluble et une partie non soluble
WO2013005063A1 (fr) * 2011-07-06 2013-01-10 Ante Vukovic Système de surveillance et de commande automatiques de production et de finition de tuyaux de matière plastique enroulés en spiral
WO2013087775A1 (fr) * 2011-12-16 2013-06-20 Robert Bosch Gmbh Procédé de bobinage pour fabriquer une ébauche de corps creux en forme de tube à symétrie de révolution, dispositif et procédé de fabrication d'un dispositif pour sa fabrication
US10183420B2 (en) 2016-02-15 2019-01-22 General Electric Company Resistively heated thermoplastic washout mandrel

Also Published As

Publication number Publication date
GB2266263A (en) 1993-10-27
AU8866491A (en) 1992-06-11
GB2266263B (en) 1994-06-01
GB9309736D0 (en) 1993-07-14
GB9024789D0 (en) 1991-01-02

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