WO2003041939A1 - A datum system for use in moulding operations - Google Patents

A datum system for use in moulding operations Download PDF

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Publication number
WO2003041939A1
WO2003041939A1 PCT/GB2002/004937 GB0204937W WO03041939A1 WO 2003041939 A1 WO2003041939 A1 WO 2003041939A1 GB 0204937 W GB0204937 W GB 0204937W WO 03041939 A1 WO03041939 A1 WO 03041939A1
Authority
WO
WIPO (PCT)
Prior art keywords
mould tool
location hole
tool
component
mould
Prior art date
Application number
PCT/GB2002/004937
Other languages
French (fr)
Inventor
Philip James Acklam
Original Assignee
Bae Systems Plc
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 Bae Systems Plc filed Critical Bae Systems Plc
Publication of WO2003041939A1 publication Critical patent/WO2003041939A1/en

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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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/26—Moulds
    • B29C45/37—Mould cavity walls, i.e. the inner surface forming the mould cavity, e.g. linings
    • 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/0053—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor combined with a final operation, e.g. shaping
    • B29C45/0055—Shaping
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/28—Shaping operations therefor
    • B29C70/40—Shaping or impregnating by compression not applied
    • B29C70/42—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles
    • B29C70/46—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using matched moulds, e.g. for deforming sheet moulding compounds [SMC] or prepregs
    • B29C70/48—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using matched moulds, e.g. for deforming sheet moulding compounds [SMC] or prepregs and impregnating the reinforcements in the closed mould, e.g. resin transfer moulding [RTM], e.g. by vacuum
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • 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
    • B29C70/54—Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
    • B29C70/545—Perforating, cutting or machining during or after moulding
    • 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
    • B29C2793/00—Shaping techniques involving a cutting or machining operation
    • B29C2793/0009—Cutting out
    • B29C2793/0018—Cutting out for making a hole
    • 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
    • B29C2793/00—Shaping techniques involving a cutting or machining operation
    • B29C2793/009—Shaping techniques involving a cutting or machining operation after shaping
    • 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
    • B29C33/0033—Moulds or cores; Details thereof or accessories therefor constructed for making articles provided with holes

Definitions

  • the present invention relates to a datum system for use in moulding operations, and more particularly but not exclusively in the manufacture of composite structures where tolerances are strict, especially those manufactured using Resin Transfer Moulding (RTM) techniques.
  • RTM Resin Transfer Moulding
  • Composite structures are generally built up from several component parts. Each part is individually manufactured, and then the parts are assembled together to form the structure. Resin Transfer Moulding (RTM) is becoming a preferred method of manufacturing composite structures where tight tolerances are required.
  • RTM Resin Transfer Moulding
  • the traditional pre-impregnated carbon fibre sheets are not used in RTM. Instead a carbon fibre fabric is partially impregnated with resin, and several layers of partially impregnated fabric are laid up on a pre-form mould before being pre-formed at approximately 100C in a vacuum to produce a preform component.
  • This pre-form component is then placed in a RTM mould tool, which is a closed mould tool suitable for injection moulding. A vacuum is first applied to draw out air, and then a resin is injected into the mould.
  • the mould tool is simultaneously subjected to heat for curing the resin, and pressure for ensuring an accurate component is formed, thereby allowing the resin to cure to produce the composite component.
  • the mould is then opened and the composite component is removed, and is then located in a drill tool.
  • the drill tool is datumed with respect to the drilling machine, the component held within the drill tool is datumed with respect to the drill tool, and then location holes are drilled in the component as required using a datum point on the drill tool as a reference.
  • the location holes must be accurate as these are used during assembly of the structure, and any holes drilled outside of the tolerance limit will have a knock-on effect resulting in the assembled structure being outside of its tolerance limit.
  • the present invention seeks to provide an improved datum system for increasing the accuracy and repeatability of manufacture of component parts of a structure.
  • a mould tool for use in moulding operations, the tool comprising one or more shape-defining portions which together define an interior space within the mould tool in the shape of a component to be manufactured within the tool, and an inlet path for allowing fluid to be introduced into the mould tool, wherein the mould tool further comprises a sealable location hole which extends at least from a surface of the mould tool to the interior space within the mould tool.
  • a mould tool having one or more shape-defining portions which together define an interior space within the mould tool in the shape of a component to be manufactured within the tool, and an inlet path for allowing fluid to be introduced into the mould tool, the mould tool further comprising a sealable location hole which extends at least from a surface of the mould tool to the interior space within the mould tool;
  • the present invention eliminates the need for the repositioning and redatuming of the component on a drill tool for the drilling operation to be carried out.
  • the present invention thereby provides a more accurate way of drilling location holes in the component and reduces the cumulative errors associated with the known methods of manufacture, resulting in a structure being built to very strict tolerance limits. Furthermore, the costs associated with producing a drill tool are eliminated, and there are significant process time and cost reductions at the sub-assembly stage.
  • the mould tool is designed such that the effects of thermal contraction are taken into account, allowing the drilling operation to be carried out at any stage of the mould tool cool down.
  • Figure 1 shows a cross section through a RTM mould tool in accordance with the present invention.
  • Figure 2 shows a schematic process diagram for a moulding operation carried out in accordance with the present invention.
  • the mould tool 1 is a resin transfer moulding tool used in the manufacture of composite components for the aircraft industry.
  • the mould tool 1 comprises a first shape-defining portion 2 and a second shape-defining portion 3.
  • the shape-defining portions 2 and 3 together define an interior space 5 within the mould tool in the shape of a component to be manufactured within the tool.
  • An inlet 4 and an outlet 15 are provided for the injection of a fluid, which in this example is resin.
  • the mould tool has a sealable location hole 6, which was formed in the mould tool during its manufacture, and which is to be used as a datum for both the mould tool and the component which is to be formed therein.
  • the location hole 6 has a stopper 7 which extends into the location hole 6 and which is surrounded by a seal 8.
  • the seal acts to prevent any resin escaping during the RTM process.
  • a pre-formed component 9 is placed in the mould tool 1 , the location hole 6 is sealed, and the mould tool 1 is placed in a heating press 10.
  • a vacuum is applied to outlet 15 to draw out air from the mould tool 1.
  • resin is injected into inlet 4 until no further resin is required, and the component 9 is then cured by heating in the press.
  • a variation of this technique is to use a mould tool with its own heating and clamping system instead of a separate heating press.
  • the mould tool Once the mould tool has cooled a little, the stopper 7 is removed. A drill bit 11 of a drill 12 is inserted into the location hole 6, and the drill bit 11 is guided down the location hole 6 to drill into the component 9. If the location hole 14 in the component is required to extend through the component, then the mould tool may have a corresponding location hole 13 in the portion 2 of the mould tool remote from the stopper 7. When the mould tool 1 is assembled, the location holes 6 and 13 are located linearly on either side of the component, so that a hole can be drilled through the component without damaging the mould tool. The resultant component is then removed from the mould tool 1 , and has a location hole 14 that has been produced without the need to reposition the component on a drill tool.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

A mould tool for use in moulding operations is provided, as well as a method of carrying out a moulding operation. The method comprises at least the steps of: Providing a mould tool having one or more shape-defining portions which together define an interior space within the mould tool in the shape of a component to be manufactured within the tool, and an inlet path for allowing fluid to be injected into the mould tool, the mould tool further comprising a sealable location hole which extends at least from a surface of the mould tool to the interior space within the mould tool; Sealing the location hole in the mould tool; Injecting fluid through an inlet into the mould tool, allowing the fluid to solidify; Unsealing the location hole in the mould tool; Inserting a drill bit into the location hole in the mould took, and drilling a location hole in the component, the location hole in the component being a continuation of the location hole in the mould tool; Removing the component from the mould tool.

Description

A DATUM SYSTEM FOR USE IN MOULDING OPERATIONS
The present invention relates to a datum system for use in moulding operations, and more particularly but not exclusively in the manufacture of composite structures where tolerances are strict, especially those manufactured using Resin Transfer Moulding (RTM) techniques.
Composite structures are generally built up from several component parts. Each part is individually manufactured, and then the parts are assembled together to form the structure. Resin Transfer Moulding (RTM) is becoming a preferred method of manufacturing composite structures where tight tolerances are required. The traditional pre-impregnated carbon fibre sheets are not used in RTM. Instead a carbon fibre fabric is partially impregnated with resin, and several layers of partially impregnated fabric are laid up on a pre-form mould before being pre-formed at approximately 100C in a vacuum to produce a preform component. This pre-form component is then placed in a RTM mould tool, which is a closed mould tool suitable for injection moulding. A vacuum is first applied to draw out air, and then a resin is injected into the mould. The mould tool is simultaneously subjected to heat for curing the resin, and pressure for ensuring an accurate component is formed, thereby allowing the resin to cure to produce the composite component. The mould is then opened and the composite component is removed, and is then located in a drill tool. The drill tool is datumed with respect to the drilling machine, the component held within the drill tool is datumed with respect to the drill tool, and then location holes are drilled in the component as required using a datum point on the drill tool as a reference. The location holes must be accurate as these are used during assembly of the structure, and any holes drilled outside of the tolerance limit will have a knock-on effect resulting in the assembled structure being outside of its tolerance limit.
There are slight errors associated with the design and manufacture of the drill tool, and the datuming of the drill tool on the drill machine. There are also slight errors associated with the positioning and datuming of the component on the drill tool, and the use of a datum point on the drill tool as a reference for the drilling of the location holes in the component. All of these errors associated with repositioning and redatuming add up, and can result in the location holes being drilled outside of their required tolerance limit.
The present invention seeks to provide an improved datum system for increasing the accuracy and repeatability of manufacture of component parts of a structure.
According to the present invention in one aspect thereof there is provided a mould tool for use in moulding operations, the tool comprising one or more shape-defining portions which together define an interior space within the mould tool in the shape of a component to be manufactured within the tool, and an inlet path for allowing fluid to be introduced into the mould tool, wherein the mould tool further comprises a sealable location hole which extends at least from a surface of the mould tool to the interior space within the mould tool.
According to the present invention in another aspect thereof there is provided a method of carrying out a moulding operation comprising at least the steps of:
Providing a mould tool having one or more shape-defining portions which together define an interior space within the mould tool in the shape of a component to be manufactured within the tool, and an inlet path for allowing fluid to be introduced into the mould tool, the mould tool further comprising a sealable location hole which extends at least from a surface of the mould tool to the interior space within the mould tool;
Sealing the location hole in the mould tool;
Injecting fluid through an inlet into the mould tool;
Allowing the fluid to solidify; Unsealing the location hole in the mould tool;
Inserting a drill bit into the location hole in the mould tool, and drilling a location hole in the component, the location hole in the component being a continuation of the location hole in the mould tool;
Removing the component from the mould tool. It can be seen that the present invention eliminates the need for the repositioning and redatuming of the component on a drill tool for the drilling operation to be carried out. The present invention thereby provides a more accurate way of drilling location holes in the component and reduces the cumulative errors associated with the known methods of manufacture, resulting in a structure being built to very strict tolerance limits. Furthermore, the costs associated with producing a drill tool are eliminated, and there are significant process time and cost reductions at the sub-assembly stage.
Preferably the mould tool is designed such that the effects of thermal contraction are taken into account, allowing the drilling operation to be carried out at any stage of the mould tool cool down.
The present invention will now be described by way of example only with reference to the following drawings:
Figure 1 shows a cross section through a RTM mould tool in accordance with the present invention.
Figure 2 shows a schematic process diagram for a moulding operation carried out in accordance with the present invention.
Referring now to Figure 1 , in this example, the mould tool 1 is a resin transfer moulding tool used in the manufacture of composite components for the aircraft industry. The mould tool 1 comprises a first shape-defining portion 2 and a second shape-defining portion 3. The shape-defining portions 2 and 3 together define an interior space 5 within the mould tool in the shape of a component to be manufactured within the tool. An inlet 4 and an outlet 15 are provided for the injection of a fluid, which in this example is resin. The mould tool has a sealable location hole 6, which was formed in the mould tool during its manufacture, and which is to be used as a datum for both the mould tool and the component which is to be formed therein. The location hole 6 has a stopper 7 which extends into the location hole 6 and which is surrounded by a seal 8. The seal acts to prevent any resin escaping during the RTM process. In use, as shown in Figure 2, a pre-formed component 9 is placed in the mould tool 1 , the location hole 6 is sealed, and the mould tool 1 is placed in a heating press 10. A vacuum is applied to outlet 15 to draw out air from the mould tool 1. Following this operation resin is injected into inlet 4 until no further resin is required, and the component 9 is then cured by heating in the press. A variation of this technique is to use a mould tool with its own heating and clamping system instead of a separate heating press.
Once the mould tool has cooled a little, the stopper 7 is removed. A drill bit 11 of a drill 12 is inserted into the location hole 6, and the drill bit 11 is guided down the location hole 6 to drill into the component 9. If the location hole 14 in the component is required to extend through the component, then the mould tool may have a corresponding location hole 13 in the portion 2 of the mould tool remote from the stopper 7. When the mould tool 1 is assembled, the location holes 6 and 13 are located linearly on either side of the component, so that a hole can be drilled through the component without damaging the mould tool. The resultant component is then removed from the mould tool 1 , and has a location hole 14 that has been produced without the need to reposition the component on a drill tool.
It is evident that this mould tool and method are applicable to other moulding applications, and the RTM example given is just an application of the invention. Mould tools falling within the scope of this invention could be utilised in other moulding applications such as plastic or metal injection moulding for example.

Claims

CLA1MS
1. A mould tool for use in moulding operations, the tool comprising one or more shape-defining portions which together define an interior space within the mould tool in the shape of a component to be manufactured within the tool, and an inlet path for allowing fluid to be introduced into the mould tool, wherein the mould tool further comprises a sealable location hole which extends at least from a surface of the mould tool to the interior space within the mould tool.
2. A method of carrying out a moulding operation comprising at least the steps of:
Providing a mould tool having one or more shape-defining portions which together define an interior space within the mould tool in the shape of a component to be manufactured within the tool, and an inlet path for allowing fluid to be introduced into the mould tool, the mould tool further comprising a sealable location hole which extends at least from a surface of the mould tool to the interior space within the mould tool;
Sealing the location hole in the mould tool;
Introducing fluid through an inlet into the mould tool;
Allowing the fluid to solidify; Unsealing the location hole in the mould tool;
Inserting a drill bit into the location hole in the mould tool, and drilling a location hole in the component, the location hole in the component being a continuation of the location hole in the mould tool;
Removing the component from the mould tool.
PCT/GB2002/004937 2001-11-13 2002-11-01 A datum system for use in moulding operations WO2003041939A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0127232.7 2001-11-13
GB0127232A GB0127232D0 (en) 2001-11-13 2001-11-13 A datum system for use in moulding operations

Publications (1)

Publication Number Publication Date
WO2003041939A1 true WO2003041939A1 (en) 2003-05-22

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WO (1) WO2003041939A1 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015011737A1 (en) * 2015-09-04 2017-03-09 Audi Ag Process for producing a fiber-reinforced plastic component
EP3210882A1 (en) * 2016-02-08 2017-08-30 Bell Helicopter Textron Inc. Composite wing structure and methods of manufacture
CN108943545A (en) * 2018-07-12 2018-12-07 安徽佳力奇碳纤维科技股份公司 A kind of composite material boring method
US10399285B2 (en) 2016-02-08 2019-09-03 Bell Helicopter Textron Inc. Composite wing structure and methods of manufacture
EP3584067A3 (en) * 2016-02-08 2020-04-29 Bell Helicopter Textron Inc. Composite wing structure and methods of manufacture
CN111645337A (en) * 2019-03-04 2020-09-11 波音公司 Tool assembly for manufacturing porous composite structures and related systems and methods

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US3724803A (en) * 1970-09-29 1973-04-03 A Goldfarb Gear molding device
DE2356172A1 (en) * 1972-11-10 1974-05-16 Mekusta Dr Ferdinand Pauler Fa Socket or bulge formation on thermoplastics pipe - by local inflation esp while still soft immediately after pipe is injection moulded around core
GB1459808A (en) * 1974-06-12 1976-12-31 Ramix Bv Mould for forming hollow articles
JPS63197619A (en) * 1987-02-13 1988-08-16 Pijiyon Kk Drilling method of injection molding and drilling device therefor
EP0807504A1 (en) * 1996-04-08 1997-11-19 The Boeing Company Dual purpose lay-up tool
US5756034A (en) * 1996-11-22 1998-05-26 Newton; John R. Molded boat hull having in situ holes to accommodate through-hull fittings
WO1998050180A1 (en) * 1997-05-06 1998-11-12 The Boeing Company Hybrid lay-up tool
FR2763881A1 (en) * 1997-05-30 1998-12-04 Peguform France Piercing of composite fibre panel damage during hole formation for fastenings
US6056531A (en) * 1996-07-02 2000-05-02 Honda Giken Kabushiki Kaisha Apparatus for vacuum forming synthetic resin products

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3724803A (en) * 1970-09-29 1973-04-03 A Goldfarb Gear molding device
DE2356172A1 (en) * 1972-11-10 1974-05-16 Mekusta Dr Ferdinand Pauler Fa Socket or bulge formation on thermoplastics pipe - by local inflation esp while still soft immediately after pipe is injection moulded around core
GB1459808A (en) * 1974-06-12 1976-12-31 Ramix Bv Mould for forming hollow articles
JPS63197619A (en) * 1987-02-13 1988-08-16 Pijiyon Kk Drilling method of injection molding and drilling device therefor
EP0807504A1 (en) * 1996-04-08 1997-11-19 The Boeing Company Dual purpose lay-up tool
US6056531A (en) * 1996-07-02 2000-05-02 Honda Giken Kabushiki Kaisha Apparatus for vacuum forming synthetic resin products
US5756034A (en) * 1996-11-22 1998-05-26 Newton; John R. Molded boat hull having in situ holes to accommodate through-hull fittings
WO1998050180A1 (en) * 1997-05-06 1998-11-12 The Boeing Company Hybrid lay-up tool
FR2763881A1 (en) * 1997-05-30 1998-12-04 Peguform France Piercing of composite fibre panel damage during hole formation for fastenings

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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015011737A1 (en) * 2015-09-04 2017-03-09 Audi Ag Process for producing a fiber-reinforced plastic component
DE102015011737B4 (en) * 2015-09-04 2018-01-04 Audi Ag Process for producing a fiber-reinforced plastic component
EP3210882A1 (en) * 2016-02-08 2017-08-30 Bell Helicopter Textron Inc. Composite wing structure and methods of manufacture
US10399285B2 (en) 2016-02-08 2019-09-03 Bell Helicopter Textron Inc. Composite wing structure and methods of manufacture
EP3584067A3 (en) * 2016-02-08 2020-04-29 Bell Helicopter Textron Inc. Composite wing structure and methods of manufacture
US10639854B2 (en) 2016-02-08 2020-05-05 Bell Helicopter Textron Inc. Composite wing structure and methods of manufacture
US10814567B2 (en) 2016-02-08 2020-10-27 Bell Helicopter Textron Inc. Composite wing structure and methods of manufacture
US10836121B2 (en) 2016-02-08 2020-11-17 Bell Helicopter Textron Inc. Methods of manufacture of a composite wing structure
US11628633B2 (en) 2016-02-08 2023-04-18 Textron Innovations Inc. Composite wing structure and methods of manufacture
CN108943545A (en) * 2018-07-12 2018-12-07 安徽佳力奇碳纤维科技股份公司 A kind of composite material boring method
CN111645337A (en) * 2019-03-04 2020-09-11 波音公司 Tool assembly for manufacturing porous composite structures and related systems and methods
CN111645337B (en) * 2019-03-04 2023-09-19 波音公司 Tool assembly for fabricating porous composite structures and related systems and methods

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