CN115139549A - Forming method of composite material rotary drum, composite material rotary drum and ship - Google Patents
Forming method of composite material rotary drum, composite material rotary drum and ship Download PDFInfo
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- 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
- B29C70/30—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
- B29C70/34—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation
- B29C70/342—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation using isostatic pressure
-
- 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
- B29C33/40—Plastics, e.g. foam or rubber
-
- 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
- B29C70/30—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
- B29C70/36—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and impregnating by casting, e.g. vacuum casting
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H9/00—Marine propulsion provided directly by wind power
- B63H9/02—Marine propulsion provided directly by wind power using Magnus effect
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Manufacturing & Machinery (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Combustion & Propulsion (AREA)
- Ocean & Marine Engineering (AREA)
- Moulding By Coating Moulds (AREA)
Abstract
The invention provides a forming method of a composite material rotary drum, the composite material rotary drum and a ship. The forming method of the composite material rotary cylinder can realize circumferential integrated forming of the flettner composite material rotary cylinder, avoids complex operation procedures such as split filling and die assembly, improves the production efficiency of products, and improves the appearance quality such as the roundness of the products; the resin inside the composite material rotary drum is accurately and uniformly distributed, the adverse effect of gravity on the uniform distribution of the resin in the process of pouring and forming is eliminated, the circumferential high-precision quality uniform distribution control is realized, and the dynamic balance grade of the rotary drum product in operation is improved.
Description
Technical Field
The invention relates to the technical field of ship accessories, in particular to a forming method of a composite material rotary cylinder, the composite material rotary cylinder and a ship.
Background
The modern self-propelled ship mostly does not have a large-volume sail navigation aid due to limited space, and the utilization of wind energy is almost zero; however, with the increasing severity of energy conservation and emission reduction situations, wind energy is utilized to assist in propulsion and pay attention again.
The wind power boosting composite material rotary drum can change the wind direction of a ship in navigation, so that the wind power boosting composite material rotary drum provides thrust in the navigation direction for the ship, and has the advantages of good energy-saving effect, strong boosting force, small size and the like, thereby having wide application prospect. Through evaluation, the force perpendicular to the wind speed direction is generated by the rotation of the wind power boosting composite material rotary cylinder in the wind on the premise of not reducing the navigational speed, so that the forward boosting power is provided for the ship, and the fuel oil of the ship can be saved by 5-30%.
It is contemplated that the performance of a wind-assisted composite spinner may be affected by a number of factors including size, weight, corrosion resistance, high structural integrity and/or stiffness of the composite spinner, uniform mass distribution of the composite spinner across its various cross-sections and/or planes of symmetry, the balance weight of the composite spinner body in operation, and the like.
Currently, there is less research on the forming method of flettner composite spin cylinders based on the magnus effect. For example, in the chinese patent publication No. CN106103269a, by axial segmented molding, each segment of the annular unit is formed by a complex segment molding process, specifically, a single ring unit is circumferentially divided into 3 or more pieces, each piece is formed by vacuum infusion or prepreg molding, and different segments are formed into an annular member by complex tooling for mold closing operation; however, the problems of complicated process, high difficulty in controlling manufacturing precision, uneven circumferential mass distribution caused by local reinforcement of the die closing seam, high processing cost and the like exist.
For a straight-barrel type composite material component, a circumferential integrated forming mode is adopted, so that the problems of uneven mass distribution and complex single-piece forming process caused by a die assembly process can be effectively avoided, the traditional technology is winding, but the winding technology can only prepare a pure glass fiber structure or a pure carbon fiber structure with a single structure, the preparation of a core material sandwich structure product cannot be realized, and the winding technology is adopted to produce a long barrel, so that the defects of demoulding deformation, low processing precision and the like generally exist, and the long barrel is not suitable for producing high-precision products. The potential feasible method for preparing the straight-tube composite material with the core-added light structure is to adopt a vacuum infusion technology, but adopt vacuum infusion integrated molding, in order to ensure the vacuum tightness of the mold, a circumferential integrated mold needs to be processed, and the technical problem of adopting the technology is as follows: (1) In the process of curing and heat releasing of a product, resin heat release, expansion with heat and contraction with cold cannot be avoided, the product is limited by a mold, severe internal stress occurs, the product is partially wrinkled, and the product is scrapped; (2) After the product is formed, the product is only pasted on the die, and the product cannot be separated from the die due to huge pasting force; (3) Adopt integrated into one piece, the resin belongs to viscous liquid, receives the influence of gravity, and the resin can't avoid appearing gathers to the level low level, leads to the final mass distribution of product uneven.
How to effectively eliminate uneven resin distribution caused by gravity factors in the molding process and prepare the composite material rotary drum with uniformly distributed and controlled circumferential quality is a problem to be solved by the technical personnel in the field.
Disclosure of Invention
The invention solves the problem of how to effectively eliminate uneven resin distribution caused by gravity factors in molding and prepare the composite material rotary cylinder with uniformly distributed and controlled circumferential quality.
In order to solve the problems, the invention provides a method for molding a composite material rotary drum, wherein the composite material rotary drum comprises a plurality of coaxial annular units with equal diameters, and the annular units are prepared in an integrated molding mode. The device can realize convenient forming of the composite material rotary cylinder and realize uniform circumferential quality control and accurate roundness control of products.
The diameters of the annular units are the same and are consistent with the diameter of the composite material rotary cylinder, the height of each section of annular unit does not exceed the overall height of the composite material rotary cylinder, and each section of annular unit is assembled and molded on a central axis formed by the circle centers of all sections. Preferably, the annular unit is integrally formed by at least one of a vacuum infusion process or a prepreg vacuum bag pressing process.
Preferably, the annular unit comprises a multi-layer structure of a core material layer and a fiber layer, wherein the core material layer comprises at least one of polyvinyl chloride foam, polyethylene foam, polystyrene foam, cork, syntactic foam and honeycomb structure, and the fiber layer comprises at least one of a glass fiber layer or a carbon/glass mixed layer. This arrangement maintains product rigidity while effectively reducing product weight.
Preferably, the annular unit adopts a vacuum infusion process or a prepreg vacuum bag pressing process, the used mold comprises an upper sheet mold and a lower sheet mold which are arranged in a semicircle shape, the upper sheet mold and the lower sheet mold are made of rigid materials, so that the upper sheet mold and the lower sheet mold resist pressure difference generated by subsequent vacuum bag pressing and maintain the profile airfoil, and meanwhile, the upper sheet mold and the lower sheet mold are respectively connected with the mechanical control unit, so that the upper sheet mold and the lower sheet mold are separated and closed in a certain space angle, and mechanical force and effective space required by later product and mold separation are provided.
The mould is inside and outside bilayer structure, and the skin is hard material (the mould material adopts the combined material shaping or adopts the metal-working shaping) for control profile and provide structural strength, and divide into 2 pieces in the circumferential direction, 2 butt joint clearance control millimeter levels, 2 pieces assembly mechanical unit, can realize separately in certain space range and closed function.
Preferably, the chord-direction and axial dislocation control of the upper piece die and the lower piece die is less than 1mm, and the reserved gap of the upper piece die and the lower piece die in a closed state is less than 2mm, so that the circumferential airfoil profile can be accurately controlled.
Preferably, the inner wall surfaces of the upper piece die and the lower piece die are provided with linings, and the linings are made of uniform-thickness integrated high polymer materials. Preferably, the lining is made of a chemically inert plastic material with medium hardness, and the lining material is preferably made of high-density polytetrafluoroethylene (the density of the polytetrafluoroethylene is 0.941-0.965 g/cm) 3 ) Or nylon or polyethylene and other polymer materials, the inside lining is of an equal-thickness integral type, the inside lining and the mould can be firmly fixed by adopting the processes of bonding or riveting and the like, the inside lining material is used for a substrate established in vacuum, air is effectively isolated to form a sealed space, meanwhile, the mould adopts a soft polymer inside lining, the rigid contact between the mould and a product is changed into flexible contact, and the defect that the inside wrinkles are generated due to thermal expansion in the resin heat release curing molding process of the product can be effectively solved through the characteristic that the body material is easy to deform under stress. Preferably, the mold is in a horizontal posture, rotates around a central shaft, and can effectively realize uniform distribution of resin in the circumferential direction and the axial direction of the annular unit through the cyclic change of the orientation of the mold and the centrifugal force.
Compared with the prior art, the forming method of the composite material rotary drum has the following beneficial effects: (1) The method has the advantages that the flettner composite material rotary cylinder can be integrally molded in the circumferential direction, complex operation procedures such as split filling and die assembly are avoided, the production efficiency of products is improved, the appearance quality such as the roundness of the products is improved, and the problem of uneven product quality distribution caused by local reinforcement of split die assembly is effectively solved; 2) The accurate uniform distribution of resin in the product can be realized, the adverse effect of gravity on the uniform distribution of the resin in the process of pouring and forming is eliminated, and the high-precision quality uniform distribution control of the product is realized.
The invention also provides a composite material rotary drum which is obtained by adopting the forming method of the composite material rotary drum. The invention also provides a ship comprising the composite material rotary drum. The composite material rotary drum and the ship have the same beneficial effects as the forming method of the composite material rotary drum, and the details are not repeated herein.
Drawings
FIG. 1 is a schematic overall view of a composite spin basket according to an embodiment of the present invention;
FIG. 2 is a schematic view of the mold tooling of an embodiment of the present invention after opening the mold end;
fig. 3 is a schematic diagram of a molding structure of the annular unit according to the embodiment of the present invention.
Description of reference numerals:
1. a ring unit; 1-1, a first ring unit; 1-2, a second annular unit; 1-3, a third ring unit; 2-a mould; 2-1, loading a die; 2-2, a lower die; 3. a liner; 4. layering the product; 5. a positioning assembly; 6. a reinforcement ring; 7. a vacuum pump; 8. a rotating wheel.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. "beneath," "under" and "beneath" a first feature includes the first feature being directly beneath and obliquely beneath the second feature, or simply indicating that the first feature is at a lesser elevation than the second feature.
Due to the Magnus effect, under the action of wind, the rotating drum generates a lifting force vertical to the blowing direction, and the component force of the rotating drum in the advancing direction of the ship pushes the ship to advance, so that the energy consumption of the ship is reduced, and the effects of energy conservation and emission reduction are achieved. Because the size of the rotating drum is quite large, and the rotating drum is usually in a high-speed rotating state, the requirements on the uniformity, concentricity and dimensional accuracy of the required material are quite high when the rotating drum is designed, produced and manufactured, the requirements on the manufacturing process are very high, and the manufacturing cost is high.
The composite material rotary drum is mainly used in the field of energy saving of wind power for large ship navigation, the structure is mainly formed by an external cylinder, the inside of the rotary drum is connected with the base through the mounting disc, the base is mounted on a deck of the large ship, and natural wind energy is converted into power for ship navigation by utilizing the Magnus effect through high-speed rotation of the rotary drum, so that the energy-saving effect is achieved. The research shows that: the more uniform the mass distribution of the composite material rotary drum in the circumferential direction is, the higher the running efficiency is, and the more stable the running is.
For convenience of explanation, the structure of the composite material rotary drum is explained as follows: as shown in fig. 1, the composite material cyclone consists of a plurality of coaxially arranged annular units 1, the annular units 1 being prepared by integral molding and having their longitudinal edges attached to each other. For example by a fastening assembly comprising one or more of an adhesive fastener, a bolt, a rivet, a pin, and a screw or polymeric material bond. The annular unit 1 comprises a sandwich of layers of core material, e.g. formed using a resin infusion process. The core material comprises at least one of polyvinyl chloride foam, polyethylene foam, polystyrene foam, thermoplastic polyester foam, cork, syntactic foam, and honeycomb structure. As shown in fig. 1, the composite material rotary drum comprises a first annular unit 1-1, a second annular unit 1-2 and a third annular unit 1-3 which are sequentially arranged, wherein the first annular unit 1-1, the second annular unit 1-2 and the third annular unit 1-3 are coaxially arranged in an equal diameter mode.
As shown in fig. 2 and 3, a mold tool for implementing an integral molding manner including vacuum infusion or vacuum belt press molding of prepreg includes a support (not shown in the figure), a rotating wheel 8 is disposed at an upper end of the support, a mold 2 is disposed above the rotating wheel 8, a reinforcing ring 6 is disposed on an outer wall surface of the mold 2, and the reinforcing ring 6 abuts against the rotating wheel 8, so that the mold 2 can rotate; the end part of the mould 2 is hermetically assembled through a side plate, a vacuum pump 7 is arranged on the outer side of the baffle, and the vacuum pump 7 is communicated with the inside of the mould 2 and used for vacuumizing the mould 2.
Preferably, the mold 2 includes an upper mold 2-1 and a lower mold 2-2, which are arranged in a semicircular shape, and the upper mold 2-1 and the lower mold 2-2 are respectively connected to a mechanical control unit (not shown in the figure), so that the upper mold 2-1 and the lower mold 2-2 can be separated and closed within a certain spatial angle. Preferably, the mold 2 is provided with a positioning assembly 5, the positioning assembly 5 comprises a positioning groove and a positioning pin which are arranged in a matched manner, the positioning groove is located on one of the upper mold 2-1 and the lower mold 2-2, and the positioning pin is located on the other one of the upper mold 2-1 and the lower mold 2-2. The arrangement can ensure that the upper piece die 2-1 and the lower piece die 2-2 are separated and closed in a certain space under the action of the mechanical control unit, and the high-precision reset function is kept. Preferably, four positioning assemblies 5 are arranged on two sides of the upper piece die 2-1 and the lower piece die 2-2. Preferably, the chord-direction and axial dislocation of the upper piece mold 2-1 and the lower piece mold 2-2 is controlled to be less than 1mm, the upper piece mold 2-1 and the lower piece mold 2-2 are in a closed state to form a complete circle, and a reserved gap between the upper piece mold 2-1 and the lower piece mold 2-2 is smaller than 2mm, preferably 1-2mm. Preferably, the inner wall surfaces of the upper sheet die 2-1 and the lower sheet die 2-2 are processed into semi-circles, the inner diameter of the semi-circles is usually larger than the diameter of a final product, the two semi-circles are kept coaxial after die assembly is completed, the diameter of the semi-circles is usually larger than the diameter of the final product, and the coaxiality deviation of the die 2 is controlled to be less than 1/1000 of the diameter of the die 2. It should be noted that the inner wall surfaces of the upper piece mold 2-1 and the lower piece mold 2-2 can be adjusted according to the shape of the final product, for example, the cross section of the final product is oval or other shapes, and at this time, the upper piece mold 2-1 and the lower piece mold 2-2 are processed into oval or other corresponding shapes.
Preferably, the inner wall surfaces of the upper piece mold 2-1 and the lower piece mold 2-2 are provided with linings 3, the linings 3 are made of an integral high polymer material with equal thickness, have good toughness and have compression elastic deformation exceeding 10%; the lining 3 is tightly attached to the mould 2, and the inner surface of the lining 3 is processed into the shape of a final product or slightly scaled to provide a base plate required for subsequently establishing vacuum; as an example of the invention, in the first annular unit 1-1, during the forming process, the product layer 4 is attached to the inner surface of the inner liner 3 through atmospheric pressure, and the first annular unit 1-1 is obtained after solidification; the thermal stress defect of the product layer 4 is greatly eliminated by the elastic deformation of the lining 3 in the curing and expanding process of the product layer 4, and in addition, the upper sheet die 2-1 and the lower sheet die 2-2 are opened after the forming, so that the product is smoothly separated from the die 2.
Preferably, in the process of vacuum infusion or vacuum bag pressure curing, the product laying layer 4 is laid on the inner side of the single-section mold 2, the surface of the product laying layer 4 is fully paved with a diversion medium, a flexible vacuum belt film and a sealing rubber strip are adopted to form a closed space with the inner side of the mold 2, 2 interfaces are led out, one interface is connected to a vacuum pump 7 through a gas pipeline, the other interface is connected to a resin container, the vacuum degree of the closed cavity is kept to be less than or equal to-0.09 MPa, the liquid level of the resin is guaranteed to be always lower than the horizontal plane of the laying layer, the resin enters the vacuum pump 7 along with the air in the closed space, and the resin slowly enters the laying layer and fills the closed space. The vacuum bag pressing process is adopted, firstly, the prepreg is tightly laid on the inner side of the mould 2, the flexible vacuum belt film and the sealing rubber strip are also adopted to form a closed space with the inner side of the mould, an interface is led out, and the vacuum pump 7 is connected through the interface to keep the vacuum degree of the closed space less than or equal to-0.09 MPa.
In both processes, the product laying layer 4 needs to be heated, cured and molded to prepare a first annular unit 1-1, in the process, the mold 2 is kept in a horizontal posture and rotates around the central axis of the mold 2, and meanwhile, a vacuum pump 7 is required to be placed at one end of the inner side of the mold 2 and well fixed with the mold 2, and the vacuum pump 7 synchronously rotates along with the mold 2; vacuum pump 7 adopts storage battery formula or fuel formula, can not adopt the plug-in type, avoid accompanying 2 rotations of mould to appear transmitting electricity and break off, constantly change and the centrifugal force effect through 2 morphemes of mould, control resin is at the evenly distributed of circumference, require resin precuring time to exceed 6h simultaneously, give resin and realize the required abundant time of even flow in the work in progress and spread layer 4, realize the circumference mass equipartition of final product, offset the adverse effect that gravity flows to resin completely, preparation high accuracy circumference mass distribution product.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (8)
1. The forming method of the composite material rotary drum is characterized in that the annular units (1) are prepared in an integrated forming mode.
2. The method of forming a composite spin basket according to claim 1, wherein the annular unit (1) employs at least one of a vacuum infusion process or a prepreg vacuum lamination process.
3. The method of claim 1 or 2, wherein the annular unit (1) comprises a multi-layer structure of a core material layer comprising at least one of polyvinyl chloride foam, polyethylene foam, polystyrene foam, thermoplastic polyester foam, cork, syntactic foam, honeycomb structure, and a fiber layer comprising at least one of a glass fiber layer or a carbon/glass mixed layer.
4. The molding method of the composite material rotary drum according to claim 2, wherein the annular unit (1) adopts a vacuum infusion process or a prepreg vacuum bag pressing process, the used mold (2) comprises an upper sheet mold (2-1) and a lower sheet mold (2-2) which are arranged in a semicircle shape, and the upper sheet mold (2-1) and the lower sheet mold (2-2) are respectively connected with a mechanical control unit, so that the separation and the closure of the upper sheet mold (2-1) and the lower sheet mold (2-2) are realized within a certain space angle.
5. The forming method of the composite material rotary drum is characterized in that the chord-direction and axial dislocation of the upper sheet die (2-1) and the lower sheet die (2-2) is controlled to be less than 1mm, and the reserved gap of the upper sheet die (2-1) and the lower sheet die (2-2) in a closed state is less than 2mm.
6. The molding method of the composite material rotary drum according to claim 4, characterized in that inner walls of the upper piece mold (2-1) and the lower piece mold (2-2) are provided with inner liners (3), and the inner liners (3) are made of an integral high polymer material with equal thickness.
7. A composite spin basket obtained by the method of forming a composite spin basket according to any one of claims 1 to 6.
8. A marine vessel comprising the composite spar of claim 7.
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| GB781925A (en) * | 1954-09-23 | 1957-08-28 | Bristol Aircraft Ltd | Improvements in or relating to methods of making hollow bodies from fibrous materialand heat-hardenable resin |
| US4946640A (en) * | 1989-04-17 | 1990-08-07 | Shell Oil Company | Method for forming preformed material |
| JP2008272959A (en) * | 2007-04-26 | 2008-11-13 | Toray Ind Inc | Method for manufacturing fiber-reinforced resin |
| US20100007064A1 (en) * | 2006-04-10 | 2010-01-14 | Ashton Clint H | Apparatus and method for manufacturing hollow tubular members |
| JP2011093253A (en) * | 2009-10-30 | 2011-05-12 | Kanazawa Univ | Press molding apparatus and press molding method |
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| CN107662354A (en) * | 2016-07-27 | 2018-02-06 | 中国航发商用航空发动机有限责任公司 | Make the anti-process for creping of composite cylinder and device of high microsteping content |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| GB781925A (en) * | 1954-09-23 | 1957-08-28 | Bristol Aircraft Ltd | Improvements in or relating to methods of making hollow bodies from fibrous materialand heat-hardenable resin |
| US4946640A (en) * | 1989-04-17 | 1990-08-07 | Shell Oil Company | Method for forming preformed material |
| US20100007064A1 (en) * | 2006-04-10 | 2010-01-14 | Ashton Clint H | Apparatus and method for manufacturing hollow tubular members |
| JP2008272959A (en) * | 2007-04-26 | 2008-11-13 | Toray Ind Inc | Method for manufacturing fiber-reinforced resin |
| JP2011093253A (en) * | 2009-10-30 | 2011-05-12 | Kanazawa Univ | Press molding apparatus and press molding method |
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