CN105346099A - Preparing method of carbon fiber composite thin-wall curve pipe - Google Patents
Preparing method of carbon fiber composite thin-wall curve pipe Download PDFInfo
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- CN105346099A CN105346099A CN201510718040.4A CN201510718040A CN105346099A CN 105346099 A CN105346099 A CN 105346099A CN 201510718040 A CN201510718040 A CN 201510718040A CN 105346099 A CN105346099 A CN 105346099A
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- foam core
- pipe fitting
- carbon fibre
- composite thin
- fibre composite
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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
- 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
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- Composite Materials (AREA)
- Mechanical Engineering (AREA)
- Moulding By Coating Moulds (AREA)
Abstract
The invention provides a preparing method of a carbon fiber composite thin-wall curve pipe. The method comprises the following steps that firstly, a foam core die is placed in an air bag, and the air bag is vacuumized through a vacuum pump till the foam core die is closely wrapped by the air bag; secondly, the air bag is evenly wrapped by prepreg; and thirdly, the prepreg is placed in a steel outer die, the steel outer die is placed in an oven to be heated, in the heating process, the air bag is inflated with compressed air through an air compressor, the prepreg is cured, deflation and die stripping are carried out after curing is finished, and the carbon fiber composite thin-wall curve pipe is obtained. The inner shape face of a product is controlled through the foam core die, the outer shape face of the product is controlled through the steel outer die, and the product has the beneficial effects that the appearance of the product is high in controllability, the surface state is smooth and clean, the mechanical performance is good, and the product is simple and economical; and the preparing method is suitable for forming of curve pipe products with the continuous length and large size.
Description
Technical field
The invention belongs to carbon fiber composite material article field shaping technique, be specifically related to a kind of preparation method of carbon fibre composite thin-wall curve pipe fitting.
Background technology
Carbon fibre composite (CFRP) has excellent mechanical performance and physical property, it is the important feature material being applied to the fields such as Aeronautics and Astronautics, weapons, electronics, carbon fibre reinforced pipe structure is a kind of typical unit of composition composite material framework, have lightweight, intensity is high, the performance of many excellences such as corrosion-resistant, is construction package conventional in Aeronautics and Astronautics device structure.
The shaping conventional method of traditional carbon fibre reinforced pipe part has the moulding process such as pipe crimping method, Filament-wound Machine method, pultrusion method.For the carbon fibre composite curve pipe of thin-walled, due to the complexity of its structure, according to traditional pipe crimping method, its demoulding is more difficult and easily occur lamination; And the technology difficulty adopting Filament-wound Machine method shaping is very large, be not easy the large sized fittings preparing continuous length, and product axial tensile strength is lower, outer surface is coarse, easy to leak; And although pultrusion method continuously can prepare the composite material type material products that length is not limit in theory, but in the raising of large-sized thin-wall pipe hoop mechanical property and the control of tractive force, also there is larger difficulty, to realizing variable cross-section production, also there is suitable difficulty.
Therefore, carrying out specific aim research to the technology of preparing of thin walled carbon fiber composite curve pipe, is the key point applied in lightweight field of aircraft towards carbon fibre reinforced pipe, is also the active demand of Composites Molding Techniques innovation and development.
Summary of the invention
Technical problem to be solved by this invention is for above-mentioned the deficiencies in the prior art, provides a kind of preparation method of carbon fibre composite thin-wall curve pipe fitting.The method utilizes foam core moulds to control the interior shape face of goods, steel external mold is utilized to control the external surface of goods, can design modifying be carried out to mould according to actual needs thus prepare the composite product of different morphologies, sizes, there is the advantages such as goods morphology controllable is strong, surface state is bright and clean, mechanical property is better, simple economy, be applicable to continuous length, large scale, shaped form tubing products shaping.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of preparation method of carbon fibre composite thin-wall curve pipe fitting, it is characterized in that, the mould that the method adopts comprises foam core moulds and steel external mold, the shape of described foam core moulds is curve column, the shape of described steel external mold is curved tubular, the outer wall shape of described foam core moulds and the inner wall shape of carbon fibre composite thin-wall curve pipe fitting to be prepared match, the inner wall shape of described steel external mold and the outer wall mating shapes of described carbon fibre composite thin-wall curve pipe fitting, the shape of cross section of described foam core moulds is circular, the shape of cross section of described steel external mold is annular, the diameter dimension of described foam core moulds is not more than the internal diameter size of described carbon fibre composite thin-wall curve pipe fitting, the internal diameter size of described steel external mold is equal with the outside dimension of described carbon fibre composite thin-wall curve pipe fitting, the method comprises the following steps:
Step one, foam core moulds is loaded in airbag, then utilize vavuum pump to vacuumize process to described airbag, until make airbag closely be coated on outside foam core moulds;
Step 2, prepreg is evenly coated in step one and is equipped with outside the airbag of foam core moulds; Described prepreg is carbon fiber/epoxy resin prepreg;
Step 3, the prepreg that will be coated with foam core moulds and airbag in step 2 load in steel external mold, then put into baking oven to heat, and in heating process, utilize air compressor to pass into compressed air in airbag, prepreg is made to be 150 DEG C in temperature, pressure is solidify 30min under the condition of 0.8MPa ~ 1.0MPa, to exit after solidification release, remove steel external mold and the airbag of foam core moulds is housed, obtain carbon fibre composite thin-wall curve pipe fitting, the wall thickness of described carbon fibre composite thin-wall curve pipe fitting is 0.5mm ~ 2.0mm.
The preparation method of above-mentioned a kind of carbon fibre composite thin-wall curve pipe fitting, is characterized in that, the diameter dimension of described foam core moulds is 84% ~ 95% of described carbon fibre composite thin-wall curve pipe fitting internal diameter size.
The preparation method of above-mentioned a kind of carbon fibre composite thin-wall curve pipe fitting, is characterized in that, the material of described foam core moulds is polyurethane foam.
The preparation method of above-mentioned a kind of carbon fibre composite thin-wall curve pipe fitting, it is characterized in that, in the prepreg of carbon fiber/epoxy resin described in step 2, the surface density of carbon fiber is 125g/m
2~ 200g/m
2, the gel content of described carbon fiber/epoxy resin prepreg is 30% ~ 45%.
The preparation method of above-mentioned a kind of carbon fibre composite thin-wall curve pipe fitting, is characterized in that, the external diameter of the thin-wall curve of carbon fibre composite described in step 3 pipe fitting is 10mm ~ 50mm.
The present invention compared with prior art has the following advantages:
1, the present invention adopts pressurization-mould pressing process in airbag to prepare carbon fibre composite curve pipe fitting, first prepreg is coated between foam core moulds and steel external mold according to pre-designed ply sequence, make full use of that airbag has certain heat resistance, superior flexibility, its elongation can reach the advantage of more than three times, in the process that air bag inflator expands, owing to being subject to the restriction of prepreg and steel external mold, thus produce uniform radial pressure, namely pressure is produced to steel external mold die wall, realize evenly exerting pressure in prepreg solidification process.Exit after solidification release, foam pyrolysis under high temperature action is shunk, and directly can take out from airbag, thus obtain the carbon fibre composite curve pipe of hollow and thin-walled.
2, in the present invention, foam core moulds can control the interior shape face of goods, the main outer punching block of external surface of goods controls, therefore the present invention can carry out design modifying to mould according to actual needs thus prepare the composite product of different morphologies, sizes, has the advantages such as goods morphology controllable is strong, surface state is bright and clean, mechanical property is better.
3, the present invention adopts pressurization-mould pressing process in airbag to prepare carbon fibre composite curve pipe fitting, namely air bag inflator can produce uniform pressure, and curing molding is got final product in a common firing equipment, also directly can be wound around outward resistive heater at steel external mold to heat, not only simple economy, and be applicable to continuous length, large scale, shaped form tubing products shaping.
Below in conjunction with drawings and Examples, the present invention is described in further detail.
Accompanying drawing explanation
Fig. 1 is that the present invention utilizes airbag, foam core moulds and steel external mold to carry out the view of hot-press solidifying to prepreg.
Description of reference numerals:
1-prepreg; 2-foam core moulds; 3-steel external mold;
4-airbag; 5-compressed air.
Detailed description of the invention
The present invention prepares the mould that carbon fibre composite thin-wall curve pipe fitting adopts and comprises foam core moulds 2 and steel external mold 3, the shape of described foam core moulds 2 is curve column, the shape of described steel external mold 3 is curved tubular, the outer wall shape of described foam core moulds 2 and the inner wall shape of carbon fibre composite thin-wall curve pipe fitting to be prepared match, the inner wall shape of described steel external mold 3 and the outer wall mating shapes of described carbon fibre composite thin-wall curve pipe fitting, the shape of cross section of described foam core moulds 2 is circular, the shape of cross section of described steel external mold 3 is annular, the diameter dimension of described foam core moulds 2 is not more than the internal diameter size of described carbon fibre composite thin-wall curve pipe fitting, the internal diameter size of described steel external mold 3 is equal with the outside dimension of described carbon fibre composite thin-wall curve pipe fitting.The material of described foam core moulds 2 is preferably polyurethane.
Embodiment 1
The shape of the present embodiment carbon fibre composite thin-wall curve to be prepared pipe fitting is arc, and its external diameter is 22mm, and wall thickness is 1.0mm, and chord length is 3.0m.The diameter of the foam core moulds 2 selected by the present embodiment is 17mm, and the internal diameter of selected steel external mold 3 is 22mm.Composition graphs 1, the preparation method of the present embodiment carbon fibre composite thin-wall curve pipe fitting comprises the following steps:
Step one, foam core moulds 2 is loaded in airbag 4, then airbag 4 is connected vavuum pump, open vavuum pump afterwards and process is vacuumized to described airbag 4, until make airbag 4 closely be coated on outside foam core moulds 2;
Step 2, prepreg 1 is evenly coated on closely is coated with outside the airbag 4 of foam core moulds 2 in step one; Described prepreg 1 is Unidirectional fiber/epoxy prepreg, and in described prepreg 1, the surface density of Unidirectional fiber is 150g/m
2, the gel content of prepreg 1 is 33% (mass percentage); Detailed process coated in the present embodiment is: according to 90 °
1CN/ 20 °
1CN/-20 °
1CN/ 90 °
1CN/ 20 °
1CN/-20 °
1CN/ 90 °
1CNply sequence coated, coated total number of plies is 7 layers (1CN represents one deck carbon fiber one-way prepreg);
Step 3, the prepreg 1 be coated in step 2 outside airbag 4 is loaded in steel external mold 3, then put into baking oven to heat, and in heating process, utilize air compressor to pass into compressed air 5 in airbag 4, prepreg 1 is made to be 150 DEG C in temperature, pressure is solidify 30min (hot-press solidifying state as shown in Figure 1) under the condition of 0.9MPa, to exit after solidification release, remove steel external mold 3 and be coated with the airbag 4 of foam core moulds 2, obtain carbon fibre composite thin-wall curve pipe fitting.
After testing, the external diameter of the carbon fibre composite thin-wall curve pipe fitting prepared by the present embodiment is 22mm, and average wall thickness is 0.98mm.The present embodiment utilizes foam core moulds to control the interior shape face of goods, steel external mold is utilized to control the external surface of goods, can design modifying be carried out to mould according to actual needs thus prepare the composite product of different morphologies, sizes, there is the advantages such as goods morphology controllable is strong, surface state is bright and clean, mechanical property is better, simple economy, be applicable to continuous length, large scale, shaped form tubing products shaping.
Embodiment 2
The shape of the present embodiment carbon fibre composite thin-wall curve to be prepared pipe fitting is arc, and its external diameter is 22mm, and wall thickness is 1.5mm, and chord length is 3.0m.The diameter of the foam core moulds 2 selected by the present embodiment is 16mm, and the internal diameter of selected steel external mold 3 is 22mm.Composition graphs 1, the preparation method of the present embodiment carbon fibre composite thin-wall curve pipe fitting comprises the following steps:
Step one, foam core moulds 2 is loaded in airbag 4, then airbag 4 is connected vavuum pump, open vavuum pump afterwards and process is vacuumized to described airbag 4, until make airbag 4 closely be coated on outside foam core moulds 2;
Step 2, prepreg 1 is evenly coated in step one and is equipped with outside the airbag 4 of foam core moulds 2; Described prepreg 1 comprises Unidirectional fiber/epoxy prepreg and carbon fiber woven cloth/epoxy prepreg, and in described prepreg 1, the fiber areal densities of Unidirectional fiber/epoxy prepreg is 125g/m
2, gel content is 30%; In described prepreg 1, the fiber areal densities of carbon fiber woven cloth/epoxy prepreg is 200g/m
2, gel content is 40%; Described coated detailed process is: according to 90 °
2CN/ 20 °
1CN/-20 °
1CN/ 90 °
1CN/ 20 °
1CN/-20 °
1CN/ 90 °
2CN/ 0 °
1Cply sequence coated, coated total number of plies is 10 layers, and (1CN is expressed as one deck Unidirectional fiber/epoxy prepreg, 2CN is expressed as two layers of unidirectional carbon fiber/epoxy resin prepreg, and 1C is expressed as one deck carbon fiber woven cloth/epoxy prepreg);
Step 3, the prepreg 1 be coated in step 2 outside airbag 4 is loaded in steel external mold 3, then put into baking oven to heat, and in heating process, utilize air compressor to pass into compressed air 5 in airbag 4, prepreg 1 is made to be 150 DEG C in temperature, pressure is solidify 30min (hot-press solidifying state as shown in Figure 1) under the condition of 0.9MPa, to exit after solidification release, remove steel external mold 3 and be coated with the airbag 4 of foam core moulds 2, obtain carbon fibre composite thin-wall curve pipe fitting.
After testing, the external diameter of the carbon fibre composite thin-wall curve pipe fitting prepared by the present embodiment is 22mm, and average wall thickness is 1.54mm.The present embodiment utilizes foam core moulds to control the interior shape face of goods, steel external mold is utilized to control the external surface of goods, can design modifying be carried out to mould according to actual needs thus prepare the composite product of different morphologies, sizes, there is the advantages such as goods morphology controllable is strong, surface state is bright and clean, mechanical property is better, simple economy, be applicable to continuous length, large scale, shaped form tubing products shaping.
Embodiment 3
The shape of the present embodiment carbon fibre composite thin-wall curve to be prepared pipe fitting is arc, and its external diameter is 50mm, and wall thickness is 2mm, and chord length is 8.0m.The diameter of the foam core moulds 2 selected by the present embodiment is 42mm, and the internal diameter of selected steel external mold 3 is 50mm.Composition graphs 1, the preparation method of the present embodiment carbon fibre composite thin-wall curve pipe fitting comprises the following steps:
Step one, foam core moulds 2 is loaded in airbag 4, then airbag 4 is connected vavuum pump, open vavuum pump afterwards and process is vacuumized to described airbag 4, until make airbag 4 closely be coated on outside foam core moulds 2;
Step 2, prepreg 1 is evenly coated in step one and is equipped with outside the airbag 4 of foam core moulds 2; Described prepreg 1 comprises Unidirectional fiber/epoxy prepreg and carbon fiber woven cloth/epoxy prepreg, and the Unidirectional fiber/epoxy prepreg fiber areal densities of described prepreg 1 is 150g/m
2, gel content is 33%; Carbon fiber woven cloth/epoxy prepreg the fiber areal densities of described prepreg 1 is 200g/m
2, gel content is 45%; Described coated detailed process is: according to 90 °
2CN/ 20 °
1CN/-20 °
2CN/ 90 °
2CN/ 20 °
2CN/-20 °
1CN/ 90 °
2CN/ 0 °
1Cply sequence coated, coated total number of plies is 13 layers, and (1CN is expressed as one deck Unidirectional fiber/epoxy prepreg, 2CN is expressed as two layers of unidirectional carbon fiber/epoxy resin prepreg, and 1C is expressed as one deck carbon fiber woven cloth/epoxy prepreg);
Step 3, the prepreg 1 be coated in step 2 outside airbag 4 is loaded in steel external mold 3, then put into baking oven to heat, and in heating process, utilize air compressor to pass into compressed air 5 in airbag 4, prepreg 1 is made to be 150 DEG C in temperature, pressure is solidify 30min (hot-press solidifying state as shown in Figure 1) under the condition of 1.0MPa, to exit after solidification release, remove steel external mold 3 and be coated with the airbag 4 of foam core moulds 2, obtain carbon fibre composite thin-wall curve pipe fitting.
After testing, the external diameter of the carbon fibre composite thin-wall curve pipe fitting prepared by the present embodiment is 50mm, and average wall thickness is 2.02mm.The present embodiment utilizes foam core moulds to control the interior shape face of goods, steel external mold is utilized to control the external surface of goods, can design modifying be carried out to mould according to actual needs thus prepare the composite product of different morphologies, sizes, there is the advantages such as goods morphology controllable is strong, surface state is bright and clean, mechanical property is better, simple economy, be applicable to continuous length, large scale, shaped form tubing products shaping.
Embodiment 4
The shape of the present embodiment carbon fibre composite thin-wall curve to be prepared pipe fitting is arc, and its external diameter is 10mm, and wall thickness is 0.5mm, and chord length is 1.5m.The diameter of the foam core moulds 2 selected by the present embodiment is 8.5mm, and the internal diameter of selected steel external mold 3 is 10mm.Composition graphs 1, the preparation method of the present embodiment carbon fibre composite thin-wall curve pipe fitting comprises the following steps:
Step one, foam core moulds 2 is loaded in airbag 4, then airbag 4 is connected vavuum pump, open vavuum pump afterwards and process is vacuumized to described airbag 4, until make airbag 4 closely be coated on outside foam core moulds 2;
Step 2, prepreg 1 is evenly coated in step one and is equipped with outside the airbag 4 of foam core moulds 2; Described prepreg 1 is Unidirectional fiber/epoxy prepreg, and the fiber areal densities of described prepreg 1 is 175g/m
2, gel content is 38% (mass percentage); Detailed process coated in the present embodiment is: according to 90 °
1CN/ 20 °
1CN/-20 °
1CNply sequence coated, coated total number of plies is 3 layers (1CN represents one deck carbon fiber one-way prepreg);
Step 3, the prepreg 1 be coated in step 2 outside airbag 4 is loaded in steel external mold 3, then put into baking oven to heat, and in heating process, utilize air compressor to pass into compressed air 5 in airbag 4, prepreg 1 is made to be 150 DEG C in temperature, pressure is solidify 30min (hot-press solidifying state as shown in Figure 1) under the condition of 0.8MPa, to exit after solidification release, remove steel external mold 3 and be coated with the airbag 4 of foam core moulds 2, obtain carbon fibre composite thin-wall curve pipe fitting.
After testing, the external diameter of the carbon fibre composite thin-wall curve pipe fitting prepared by the present embodiment is 10mm, and average wall thickness is 0.48mm.The present embodiment utilizes foam core moulds to control the interior shape face of goods, steel external mold is utilized to control the external surface of goods, can design modifying be carried out to mould according to actual needs thus prepare the composite product of different morphologies, sizes, there is the advantages such as goods morphology controllable is strong, surface state is bright and clean, mechanical property is better, simple economy, be applicable to continuous length, large scale, shaped form tubing products shaping.
The above is only preferred embodiment of the present invention, not imposes any restrictions the present invention.Every above embodiment is done according to invention technical spirit any simple modification, change and equivalence change, all still belong in the protection domain of technical solution of the present invention.
Claims (5)
1. the preparation method of a carbon fibre composite thin-wall curve pipe fitting, it is characterized in that, the mould that the method adopts comprises foam core moulds (2) and steel external mold (3), the shape of described foam core moulds (2) is curve column, the shape of described steel external mold (3) is curved tubular, the outer wall shape of described foam core moulds (2) and the inner wall shape of carbon fibre composite thin-wall curve pipe fitting to be prepared match, the inner wall shape of described steel external mold (3) and the outer wall mating shapes of described carbon fibre composite thin-wall curve pipe fitting, the shape of cross section of described foam core moulds (2) is circular, the shape of cross section of described steel external mold (3) is annular, the diameter dimension of described foam core moulds (2) is not more than the internal diameter size of described carbon fibre composite thin-wall curve pipe fitting, the internal diameter size of described steel external mold (3) is equal with the outside dimension of described carbon fibre composite thin-wall curve pipe fitting, the method comprises the following steps:
Step one, foam core moulds (2) is loaded in airbag (4), then vavuum pump is utilized to vacuumize process to described airbag (4), until make airbag (4) closely be coated on foam core moulds (2) outward;
Step 2, prepreg (1) is evenly coated in step one foam core moulds (2) are housed airbag (4) outward; Described prepreg (1) is carbon fiber/epoxy resin prepreg;
Step 3, the prepreg (1) inside in step 2 being coated with foam core moulds (2) and airbag (4) loads in steel external mold (3), then put into baking oven to heat, and in heating process, utilize air compressor to pass into compressed air (5) in airbag (4), prepreg (1) is made to be 150 DEG C in temperature, pressure is solidify 30min under the condition of 0.8MPa ~ 1.0MPa, to exit after solidification release, remove steel external mold (3) and the airbag (4) of foam core moulds (2) is housed, obtain carbon fibre composite thin-wall curve pipe fitting, the wall thickness of described carbon fibre composite thin-wall curve pipe fitting is 0.5mm ~ 2.0mm.
2. the preparation method of a kind of carbon fibre composite thin-wall curve pipe fitting according to claim 1, it is characterized in that, the diameter dimension of described foam core moulds (2) is 84% ~ 95% of described carbon fibre composite thin-wall curve pipe fitting internal diameter size.
3. the preparation method of a kind of carbon fibre composite thin-wall curve pipe fitting according to claim 1, is characterized in that, the material of described foam core moulds (2) is polyurethane foam.
4. the preparation method of a kind of carbon fibre composite thin-wall curve pipe fitting according to claim 1, it is characterized in that, in the prepreg of carbon fiber/epoxy resin described in step 2, the surface density of carbon fiber is 125g/m
2~ 200g/m
2, the gel content of described carbon fiber/epoxy resin prepreg is 30% ~ 45%.
5. the preparation method of a kind of carbon fibre composite thin-wall curve pipe fitting according to claim 1, is characterized in that, the external diameter of the thin-wall curve of carbon fibre composite described in step 3 pipe fitting is 10mm ~ 50mm.
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| CN106182804A (en) * | 2016-08-19 | 2016-12-07 | 上海复合材料科技有限公司 | The mould of composite pipe and forming method |
| CN107020760A (en) * | 2017-03-16 | 2017-08-08 | 泰山体育产业集团有限公司 | A kind of tubular composite material part forming methods |
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