GB2284173A - Collapsible core tool for lost-core moulding - Google Patents
Collapsible core tool for lost-core moulding Download PDFInfo
- Publication number
- GB2284173A GB2284173A GB9324345A GB9324345A GB2284173A GB 2284173 A GB2284173 A GB 2284173A GB 9324345 A GB9324345 A GB 9324345A GB 9324345 A GB9324345 A GB 9324345A GB 2284173 A GB2284173 A GB 2284173A
- Authority
- GB
- United Kingdom
- Prior art keywords
- mould
- bag
- tool
- particles
- mould bag
- 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- Withdrawn
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
- B29C33/38—Moulds or cores; Details thereof or accessories therefor characterised by the material or the manufacturing process
- B29C33/3821—Moulds or cores; Details thereof or accessories therefor characterised by the material or the manufacturing process composed of particles enclosed in a bag
-
- 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
- B29C33/48—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 with means for collapsing or disassembling
- B29C33/50—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 with means for collapsing or disassembling elastic or flexible
- B29C33/505—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 with means for collapsing or disassembling elastic or flexible cores or mandrels, e.g. inflatable
-
- 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
- B29C33/48—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 with means for collapsing or disassembling
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
An inner core tool for a lost core moulding process is made by providing a rigid mould 11, reproducing on its inner, working, surface 12A, 13A, the desired external form of the core tool; introducing a mould bag 17 into the rigid mould; causing the bag to be drawn into contact with the working surface of the mould; filling the bag with particles via a filling duct to establish close packing of the particles therein; closing the bag air-tightly to isolate the interior of the bag from ambient air pressure except via an evacuating duct 19; evacuating air from the bag interior via said duct to cause the mass of particles M to rigidify; closing the duct air-tightly to maintain a sub-atmospheric pressure therein; removing the rigidified mould bag from the rigid mould; for use as an inner mould tool for a lost core moulding process. The use of a subsidiary inflatable bag within a tool produced as above, to enable the tool, once incorporated in a mould, to be inflated further to enhance contact with mouldable material is also disclosed. Resin flow channels may be formed in the outer surface of the mould bag to facilitate resin flow over the tool. <IMAGE>
Description
METHOD OF, AND APPARATUS FOR, CASTING
This invention relates to apparatus for, a method of making, a casting. It is particularly concerned with the casting of hollow items in plastics material such as a glass reinforced polymer.
Currently when a moulder wishes to make a hollow moulding two mould halves are prepared in each of which the laminate is laid up. The loaded moulds are then brought together and the laid up material joined with resin glue. Once hardened the two mould halves are split and removed to leave a hollow moulding. Such a technique is used for manufacturing car spoiler mouldings.
To make use of resin transfer moulding a moulding is made in one piece using a foam core which is slightly smaller than the required outside dimension of the finished component. This foam core is wrapped with glass fibre and placed in a two piece mould. The mould is closed and resin injected to flow between the foam core and the inner mould faces so impregnating the glass fibre. Once the resin has cured the two piece mould is then split apart and the hollow moulding removed. A problem with this process is the cost of manufacturing the foam core and the weight of the core which adds to the weight of the finished product.
Attempts have been made to provide a process similar to that described above in which the foam core is replaced by a pressurisible bag. The pressurised bag is wrapped with the fibre reinforcement and located in a two part mould. The resin is injected and when cured the mould is split apart to allow the hollow product to be removed. The pressure bag is then deflated and removed through an aperture in the moulding. A problem found with using a pressurisible bag was that it was not practicable to readily ensure accurate working tolerances whilst the bag was being wrapped with glass fibre.
Furthermore once the partially inflated bag rapped with glass fibre is placed in the mould and finally inflated the inflation step can result in fibre being displaced and misaligned before the resin injection occurs.
Lost core casting developed in metal foundry work have been adopted for resin transfer moulding processes. A core of wax or low melt point alloy is wrapped in glass fibre and located in a mould. Once an injected moulding has hardened the core is melted and runs out through a small hole in the moulded part. Disadvantages of this process result from:
I the core being heavy and not centralising itself within the product during
injection. This leads to inaccurate wall thicknesses in the finished
product;
2 the cost of the core being high for most applications and low throughput;
3 the occurrence of significant shrinkage in the process leading to tolerance
problems.
According to a first aspect of the present invention there is provided a method of fabricating an inner core tool for use in lost core moulding process comprises the steps of: 1 providing a rigid mould which reproduces on a working surface of the mould
the external form of the inner core tool; 2 introducing a mould bag into the rigid mould; 3 providing a filling duct passage to the interior of the mould bag from outside
the mould; 4 causing the mould bag to be drawn into contact with the working surface of the
mould; 5 filling the interior of the mould bag at least in part with particles by way of the
filling duct so as to provide for close packing of the particles within the mould
bag so as to cause the bag at least in part, to conform closely to the working
surface; 6 closing the mould bag gas tightly so as to isolate the interior of the bag from
ambient air pressure except for a evacuating duct; 7 evacuating air from the interior of the bag by way of the evacuating duct to
cause the mass of close packed particles to rigidify and thereafter closing the
duct air tightly to maintain a sub-atmospheric pressure therein; 8 removing the rigidified mould bag from the rigid mould; and 9 using the rigidified mould bag as an inner mould tool for a lost core moulding
process.
According to a first preferred version of the present invention there is provided a methods according to the first aspect including the further step of incorporating within the mould bag a subsidiary inflatable bag so that in the step of using the rigidified mould bag as an inner mould tool for a lost core moulding process particles within the rigidified mould bag can be subjected to pressurising by way of the subsidiary inflatable bag so as to urge the mould bag outwardly into contact with material juxtaposed with the mould bag. Typically in use a mould bag formed into a rigid tool is located in a working mould and resin is injected in the space between the rigid tool and the working mould (which will usually incorporate fibre or other inserts for incorporation in the finished moulded product. While the injected resin is still liquid the subsidiary bag is then inflated to finally define the outer surface of the inner tool and consolidate the liquid resin which thereafter polymerises.
Preferably according to the first preferred aspect of the present invention the rigidified mould bag has an outer surface incorporating at least one channel to facilitate the flow of liquid moulding material over the mould bag prior to the step of pressurising by the subsidiary inflatable bag; and the step of inflating the subsidiary inflatable bag serves to reconfigure the mould bag so as to reduce or eliminate the or each channel.
According to a second preferred version of the first aspect of the present invention or any preceding preferred version thereof the step of causing the bag to be drawn into contact with the working surface is achieved by the application of a sub-atmospheric pressure to the working surface by way of ducts through the walls of the mould.
According to third preferred version of the first aspect of the present invention or any preceding preferred version thereof the step of filling the interior of the mould bag at least in part with particles involves particles of a substantially similar size.
According to a fourth preferred version of the first aspect of the present invention or the first, second or third preferred versions thereof the step of filling the interior of the mould bag at least in part with particles involves the use of particles which vary in size so that the largest are at least twice the size of the smallest.
According to a fifth preferred version of the first aspect of the present invention or any preceding preferred version thereof the filling step includes the introduction of nonparticulate material which is in filamentary or sheet form.
According to a second aspect of the present invention there is provided an inner core tool fabricated according to the first aspect of the present invention or any preferred version thereof.
According to a first preferred version of the second aspect of the present invention the inner mould tool includes a flexible heater element adapted for heating so as to supply heat a preliminary step of a moulding process in which the mould bag is to be used.
According to a third aspect of the present invention there is provided a moulding method for producing a moulded component comprising the steps of:
I providing a rigid mould with a moulding surface reproducing the form of the
component to be moulded; 2 introducing into and locating in the rigid mould an inner core tool as claimed
in Claim 9; 3 closing the mould to establish a pressurisible plenum volume conforming to the
form of the finished mould component; 4 introducing into the plenum volume polymerisible material and allowing the
material to polymerise; 5 opening the mould; 6 providing an aperture in the mould bag of the inner core tool so as to
depressurise the interior of the tool; 7 withdrawing at least particulate material from the tool by way of the aperture
so as to enable the mould bag to be withdrawn through the aperture.
According to a first preferred version of the third aspect of the present invention there is provided moulding method for producing a moulded component characterised by an intermediate step, during the step of introducing into the plenum volume polymerisable material, wherein a subsidiary inflatable bag located within the mould bag is caused to inflate to enhance contact pressure between particles and the inner side of the mould bag and so between the exterior of the mould bag and material located in the plenum volume.
According to a fourth aspect of the present invention there is provided a moulded component fabricated by the use of a lost core inner tool according to the second aspect or a preferred version there of.
According to a fifth aspect of the present invention there is provided a moulded component fabricated by way of a moulding method according to the third aspect.
The inner core tool of the present invention is accurately located in a mould. The bag and its filling are separately removed from the cured product through a small aperture provided in the hollow component: the particulate material, being very free flowing, can be poured out and the bag; the bag itself being of thin film, is also readily removed through the aperture.
The proposed system provides a number of advantages over existing systems.
There is no sacrificial component in the method (except possibly the mould bag
which in any event is inherently cheap);
no heating is required to remove the core;
accurate reproduction of the finished product is facilitated as no significant
shrinkage takes place during the evacuating step;
an evacuated core is readily obtained at room temperature using low cost
tooling;
there is no limitation on the size of the evacuated core that can be fabricated and
used; and
due to the low density of the particulate materials available (such a micro
balloons) the weight of the evacuated core is significantly lower than that of the
previously known wax or low melt point metal.
In addition the use of a subsidiary inflatable bag within the mould bag enables the tool once incorporated in a mould for a moulding operation to be inflated further to enhance contact with mould axle material. Typically this enables resin flow channels formed in the outer surface of the mould bag to facilitate/optimise resin flow over the tool. Thereafter the subsidiary bag is inflated to cause the mould bag to expand slightly so effectively smoothing out the flow channels and to enhance the finished surface of the mould article in contact with the mould bag.
There is also provided the option of using a flexible heater element or network in the skin of the mould bag to provided for a heating stage for the mould in which a mould tool according to the present invention is being used. Such a heater can still be removed to enable the tool to function as a lost core arrangement.
A exemplary embodiment of the invention will now be described with reference to the accompanying drawing of a moulding process of which:
Figures 1 to 4 is a rigid mould being used to form a rigidified mould bag;
and
Figure 5 shows a completed rigidified mould bag having been removed from the
rigid mould;
Figure 6 shows the bag of Figure 5 located in a working mould for the
manufacture of a hollow component; and
Figure 7 shows a moulded hollow component.
Figures 1 to 4
Split case mould 11 is made up of sections 12, 13 hinged along one side to enable the sections 12, 13 to be hinged apart to give access to interior 14 of the mould 11. Port 15 provides for access to the interior 14 of the mould. Seal 16 bounds moulding surfaces 12A, 13A once the sections 12, 13 are hinged shut as shown in Figure 1. The moulding surfaces 12A. 13A serve to provide an accurate reproduction of an external surface of a hollow component to be manufactured by way of the mould 11. A number of vacuum ports 16 are provided through the walls of the sections 12, 13 to enable a sub-atmospheric pressure to be applied to the interior 14.
Figure 1
Mould 11 is shown closed with a thin walled mould bag 17 hanging in interior 14 of the mould. Interior 18 of the bag 17 communicates with the outside of the mould 13 by way of filling neck 19.
Figure 2
Ports 16 in walls of the mould 11 provide for a sub-atmospheric pressure to be applied to cause the outer surfaces of mould bag 17 to be drawn into contact with, and so conform closely to, the moulding surfaces 12A, 13A. If necessary this effect can be enhanced by provision of a slight overpressure to the interior 18 by way of the neck 19.
Figure 3
The mould bag 17, whilst maintained in intimate contact with moulding surfaces 12A, 13A, is filled with hollow micro spheres of plastic material by way of a filling neck 19. The micro spheres form a mass M which during the filling operation behaves in the manner of a liquid.
Figure 4
The mass M is shown filling the interior 18 of the bag 17 to the extent that the bag 17 is fully supported in the vicinity of the mould surface 12A, 13. A vacuum is applied to the interior 18 of the bag 17 to withdraw air to a sufficient extent to cause the micro balloons forming the mass M to agglomerate to cause the mass M, and so the mould bag 17, to cohere into a rigid component. The filling neck 19 in then sealed off as shown in Figure 4 to preserve low pressure in the interior of the bag 17.
Figure 6
The rigidified bag 17 is removed from the mould 11 and has pre-formed glass fibre reinforcement 60 wrapped around it and is then located in the interior 61 of a working mould 62 and aligned to provide a casting plenum 63 between the outside of the bag 17 and inside moulding surface 64. Resin is then injected into the casting plenum 63 to immerse the reinforcement 60 and thereafter having cured form the required hollow fabrication F.
Figure 7
The fabrication F is removed from the working mould 62 and aperture 65 is prepared at one end. The bag 17 is cut to vent the interior of the mould bag 17 to atmosphere by way of the atmosphere. This serves to allow the micro balloons making up the mass
M to separate slightly from one another and revert to a liquid like behaviour.
Consequently the small micro-balloons are readily poured out of the bag 17 by way of aperture 65. Once the micro-balloons have been removed the bag 17 can be withdrawn also. As a result the fabrication F is left hollow. If necessary a filling cap or other closure can be provided for the aperture 65.
The exemplary embodiment represents a cheap and readily undertaken method of manufacturing hollow fabrications. The method is readily undertaken without a need for highly trained manufacturing staff and lends itself to production line use and readily provides for both small and large scale production requirements.
The exemplary embodiment makes use of a filling of particles of substantially uniform size. However depending on the type of finished product to be produced and so the degree of precision or conformity required on the outer surface of the inner tool the filling can comprise other elements. Thus it can be of particulate material of different sizes. Typically smaller particles can be used for the outer layer of the tool to provided for particularly close conformity of the inner tool surface with the surface to be moulded from when manufacturing the inner core tool and so providing for a high definition of surface for the inner tool in that region. The inner part of the filling is then taken up by particles of larger or much larger size. Additionally the filling can include other forms of material such as filamentary or sheetlike material. The only requirement is that whatever filling material is used it must be capable of being withdrawn form the inner core tool through the aperture.
The use of a subsidiary bag for further inflation within the inner core tool to consolidate any reinforcement and liquid resin enhances the resulting moulded product.
It makes use of a subsidiary bag which can also be readily removed from the interior of the inner bag on completion of a moulding operation.
Claims (14)
1 providing a rigid mould which reproduces on a working surface of the
mould the external form of the inner core tool;
2 introducing a mould bag into the rigid mould;
3 providing a filling duct passage to the interior of the mould bag from
outside the mould;
4 causing the mould bag to be drawn into contact with the working surface
of the mould;
5 filling the interior of the mould bag at least in part with particles by way
of the filling duct so as to provide for close packing of the particles within
the mould bag so as to cause the bag at least in part, to conform closely
to the working surface;
6 closing the mould bag gas tightly so as to isolate the interior of the bag
from ambient air pressure except for a evacuating duct;
7 evacuating air from the interior of the bag by way of the evacuating duct
to cause the mass of close packed particles to rigidify and thereafter
closing the duct air tightly to maintain a sub-atmospheric pressure
therein;
8 removing the rigidified mould bag from the rigid mould; and
9 using the rigidified mould bag as an inner mould tool for a lost core
moulding process.
2 A method of fabricating an inner core tool as claimed in Claim 1 including the
further step of incorporating within the mould bag a subsidiary inflatable bag
so that in the step of using the rigidified mould bag as an inner mould tool for
a lost core moulding process particles within the rigidified mould bag can be
subjected to pressurising by way of the subsidiary inflatable bag so as to urge
the mould bag outwardly into contact with material juxtaposed with the mould
bag.
3 A method of fabricating an inner core tool as claimed in Claim 2 wherein the
rigidified mould bag incorporates at least one channel to facilitate the flow of
liquid moulding material over the mould bag prior to the step of pressurising
by the subsidiary inflatable bag; the step of inflating the subsidiary inflatable bag
serving to reconfigure the mould bag so as to reduce or eliminate the or each
channel.
4 A method of fabricating an inner core tool as claimed in any preceding claim
wherein the step of causing the bag to be drawn into contact with the working
surface is achieved by the application of a sub-atmospheric pressure to the
working surface by way of ducts through the walls of the mould.
5 A method of fabricating an inner core tool as claimed in any preceding claim
wherein the step of filling the interior of the mould bag at least in part with
particles involves particles of a substantially similar size.
6 A method of fabricating an inner core tool as claimed in Claim 1, Claim 2, Claim
3 or Claim 4 wherein the step of filling the interior of the mould bag at least in
part with particles involves the use of particles which vary in size so that the
largest are at least twice the size of the smallest.
7 A method of fabricating an inner core tool as claimed in any preceding claim
wherein the filling step includes the introduction of non-particulate material
which is in filamentary or sheet form.
8 A method of fabricating an inner core tool as hereinbefore described with
reference to the accompanying drawings.
9 An inner core tool fabricated according to the method of any preceding claim.
10 An inner core tool as claimed in Claim 9 wherein the mould bag includes a
flexible heater element adapted for heating so as to supply heat a preliminary
step of a moulding process in which the mould bag is to be used.
11 A moulding method for producing a moulded component comprising the steps
of:
1 providing a rigid mould with a moulding surface reproducing the form
of the component to be moulded;
2 introducing into and locating in the rigid mould an inner core tool as
claimed in Claim 9;
3 closing the mould to establish a pressurisible plenum volume conforming
to the form of the finished mould component;
4 introducing into the plenum volume polymerisible material and allowing
the material to polymerise;
5 opening the mould;
6 providing an aperture in the mould bag of the inner core tool so as to
depressurise the interior of the tool;
7 withdrawing at least particulate material from the tool by way of the
aperture so as to enable the mould bag to be withdrawn through the
aperture.
12 A moulding method for producing a moulded component as claimed in Claim
11 characterised by an intermediate step, during the step of introducing into the
plenum volume polymerisable material, wherein a subsidiary inflatable bag
located within the mould bag is caused to inflate to enhance contact pressure
between particles and the inner side of the mould bag and so between the
exterior of the mould bag and material located in the plenum volume.
13 A moulded component fabricated by the use of a lost core inner tool as claimed
in Claim 9 or Claim 10.
14 A moulded component fabricated by way of the moulding method as claimed
in Claim 11 or Claim 12.
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9324345A GB2284173A (en) | 1993-02-06 | 1993-11-26 | Collapsible core tool for lost-core moulding |
EP95902848A EP0730519A1 (en) | 1993-11-26 | 1994-11-28 | Casting method and apparatus and products thereof |
AU11945/95A AU1194595A (en) | 1993-11-26 | 1994-11-28 | Casting method and apparatus and products thereof |
PCT/GB1994/002599 WO1995014563A1 (en) | 1993-11-26 | 1994-11-28 | Casting method and apparatus and products thereof |
BR9408141A BR9408141A (en) | 1993-11-26 | 1994-11-28 | Inner core tool manufacturing process inner core tool molding process to produce molded component and molded component |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB939302550A GB9302550D0 (en) | 1993-02-06 | 1993-02-06 | Lost core casting |
GB9324345A GB2284173A (en) | 1993-02-06 | 1993-11-26 | Collapsible core tool for lost-core moulding |
Publications (2)
Publication Number | Publication Date |
---|---|
GB9324345D0 GB9324345D0 (en) | 1994-01-12 |
GB2284173A true GB2284173A (en) | 1995-05-31 |
Family
ID=26302425
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB9324345A Withdrawn GB2284173A (en) | 1993-02-06 | 1993-11-26 | Collapsible core tool for lost-core moulding |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB2284173A (en) |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0822047A1 (en) * | 1996-08-01 | 1998-02-04 | Conception et Développement Michelin | Destructible core particularly useful for manufacturing tyres |
GB2292332B (en) * | 1994-04-22 | 1999-04-28 | Alan Roger Harper | Moulding process and apparatus therefor |
WO1999030886A1 (en) * | 1997-11-27 | 1999-06-24 | Linlan Induction Ab | Moulding die and method of providing the same with gas-evacuating means |
DE102005056420A1 (en) * | 2005-11-26 | 2007-05-31 | Bayerische Motoren Werke Ag | Producing a mold core for making hollow fiber-reinforced plastic parts comprises filling a plastic bag with particles in a mold, compacting the particles by vibration, evacuating the mold and sealing the bag |
WO2008003715A1 (en) * | 2006-07-06 | 2008-01-10 | Airbus Deutschland Gmbh | Method and moulding core for producing a fibre composite component for aviation and spaceflight |
EP2067596A1 (en) | 2007-12-06 | 2009-06-10 | Saab Ab | A method and apparatus for manufacturing of an article including an empty space |
US8500085B2 (en) | 2006-07-06 | 2013-08-06 | Airbus Operations Gmbh | Method for manufacturing a composite fiber component for aerospace |
US8906489B2 (en) | 2006-07-06 | 2014-12-09 | Airbus Operations Gmbh | Method for producing a fibre composite component for aviation and spaceflight |
US10207463B2 (en) | 2006-07-06 | 2019-02-19 | Airbus Operations Gmbh | Method for producing a fiber composite component for aerospace |
US12059823B2 (en) | 2021-09-13 | 2024-08-13 | Rohr, Inc. | Tooling element and methods for forming and using same |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1481167A (en) * | 1974-06-27 | 1977-07-27 | Imp Metal Ind Kynoch Ltd | Mandrels |
EP0212140A1 (en) * | 1985-08-22 | 1987-03-04 | The Budd Company | Method of making a hollow fiber reinforced structure |
-
1993
- 1993-11-26 GB GB9324345A patent/GB2284173A/en not_active Withdrawn
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1481167A (en) * | 1974-06-27 | 1977-07-27 | Imp Metal Ind Kynoch Ltd | Mandrels |
EP0212140A1 (en) * | 1985-08-22 | 1987-03-04 | The Budd Company | Method of making a hollow fiber reinforced structure |
Cited By (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2292332B (en) * | 1994-04-22 | 1999-04-28 | Alan Roger Harper | Moulding process and apparatus therefor |
EP0822047A1 (en) * | 1996-08-01 | 1998-02-04 | Conception et Développement Michelin | Destructible core particularly useful for manufacturing tyres |
AU720587B2 (en) * | 1996-08-01 | 2000-06-08 | Conception Et Developpement Michelin, S.A. | Destructible core for use, in particular, in the assembling of a tire |
US6224808B1 (en) | 1996-08-01 | 2001-05-01 | Conception Et Developpement Michelin S.A. | Destructible core for use, in particular, in the assembling of a tire |
WO1999030886A1 (en) * | 1997-11-27 | 1999-06-24 | Linlan Induction Ab | Moulding die and method of providing the same with gas-evacuating means |
DE102005056420A1 (en) * | 2005-11-26 | 2007-05-31 | Bayerische Motoren Werke Ag | Producing a mold core for making hollow fiber-reinforced plastic parts comprises filling a plastic bag with particles in a mold, compacting the particles by vibration, evacuating the mold and sealing the bag |
DE102005056420B4 (en) * | 2005-11-26 | 2017-12-21 | Bayerische Motoren Werke Aktiengesellschaft | Process for producing a support core for the production of a fiber-reinforced structural hollow component |
JP2009542459A (en) * | 2006-07-06 | 2009-12-03 | エアバス ドイッチュラント ゲゼルシャフト ミット ベシュレンクテル ハフツング | Method for producing aerospace and space navigation fiber composite material member and molded core |
US8500085B2 (en) | 2006-07-06 | 2013-08-06 | Airbus Operations Gmbh | Method for manufacturing a composite fiber component for aerospace |
US8906489B2 (en) | 2006-07-06 | 2014-12-09 | Airbus Operations Gmbh | Method for producing a fibre composite component for aviation and spaceflight |
US9492974B2 (en) | 2006-07-06 | 2016-11-15 | Airbus Operations Gmbh | Method for producing a fiber composite component for aviation and spaceflight |
WO2008003715A1 (en) * | 2006-07-06 | 2008-01-10 | Airbus Deutschland Gmbh | Method and moulding core for producing a fibre composite component for aviation and spaceflight |
US10207463B2 (en) | 2006-07-06 | 2019-02-19 | Airbus Operations Gmbh | Method for producing a fiber composite component for aerospace |
EP2067596A1 (en) | 2007-12-06 | 2009-06-10 | Saab Ab | A method and apparatus for manufacturing of an article including an empty space |
US7758793B2 (en) | 2007-12-06 | 2010-07-20 | Saab Ab | Method and apparatus for manufacturing of an article including an empty space |
US12059823B2 (en) | 2021-09-13 | 2024-08-13 | Rohr, Inc. | Tooling element and methods for forming and using same |
Also Published As
Publication number | Publication date |
---|---|
GB9324345D0 (en) | 1994-01-12 |
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