CN108973159A - A kind of I-shaped stringer moulding process of composite material - Google Patents
A kind of I-shaped stringer moulding process of composite material Download PDFInfo
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- CN108973159A CN108973159A CN201710401959.XA CN201710401959A CN108973159A CN 108973159 A CN108973159 A CN 108973159A CN 201710401959 A CN201710401959 A CN 201710401959A CN 108973159 A CN108973159 A CN 108973159A
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- Prior art keywords
- stringer
- edge strip
- shaped
- soft mode
- core model
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Classifications
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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
- B29C70/30—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
- B29C70/38—Automated lay-up, e.g. using robots, laying filaments according to predetermined patterns
- B29C70/382—Automated fiber placement [AFP]
-
- 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
- B29C70/38—Automated lay-up, e.g. using robots, laying filaments according to predetermined patterns
- B29C70/386—Automated tape laying [ATL]
-
- 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
Abstract
The present invention provides a kind of I-shaped stringer moulding process of composite material, comprising steps of manufacture hard mold tooling；Manufacture soft mode technique cover board；Manufacture lower edge strip soft mode；I-shaped stringer mandrel molding；Edge strip is flat-plate molded under I-shaped stringer；Edge strip is flat-plate molded in I-shaped stringer；The molding of stringer spill item；I-shaped stringer tooling combination；Vacuum bag processed；Solidification；Demoulding.The presentation quality of the part of process according to the invention manufacture is preferable, and the generation of the internal flaw of part is not will lead to, even for relatively thin part, also the Forming Quality of part can be improved, the requirement of the accuracy of manufacture and cooperation precision of forming frock is also reduced simultaneously, to reduce the manufacturing cost of part.
Description
Technical field
The invention belongs to composite material manufacturing fields, and in particular to a kind of I-shaped stringer moulding process of composite material.
Background technique
With the increase of aviation composite dosage, composite material manufacturing industry rapidly becomes the main composition of aircraft industry
Part.And in this kind of composite material, I-shaped stringer is widely used in aircraft due to its good mechanical property at present
In housing construction.The I-shaped most common moulding process of stringer is autoclave process.I-shaped stringer due to descending edge strip equal thereon
There is certain assembly relation, thus tooling used when its molding is mainly assembled tool, rather than common formpiston tooling, former
Tooling.And in assembled tool, the domestic and international most-often used tooling matched for hard mold with hard mold of composite material manufacturer.
In firmly-hard mold combining form, since the type face of two sides tooling, shape are formed by numerically-controlled machine tool milling, machining accuracy compared with
Height, thus can guarantee the surface quality of forming parts well, control the thickness uniformity and outer dimension of part.
However for elongated and thinner thickness composite material parts, hard mold-hard mold combination die but has some disadvantages.
Slim-lined construction needs part to have good cooperation precision, when part thickness is relatively thin, if the cooperation precision of mold is improper, can lead
The prepreg for causing composite material in the curing process, is pressurized uneven, and this problem can further result in inside parts
Defect, such as hole, layering.And in order to prepare qualified part, then need such tooling to have point-device positioning relation, conveniently
Having re-assemblied it still after being dismounted for multiple times, and dismounting has accurate positioning relation.And this requirement further improves this
The design requirement and processing request of class tooling, lead to the raising of the manufacturing cost of part.At the same time, since such tooling needs
Repeatedly solidify into tank, multiple thermal cycle also results in the cooperation accuracy decline of tooling.And another common method is then with soft
Mould substitutes side hard mold, and structure is soft mode-hard mold structure.But due to its own insufficient rigidity of soft mode, it is easy under solidifying pressure
Deformation, causes surface quality of workpieces poor, is generally not used for the part that molding has assembly relation.
Summary of the invention
Aiming at the problems existing in the prior art, the invention proposes a kind of I-shaped stringers of composite material to form work
Skill, can the satisfactory I-shaped stringer of Forming Quality, convenient for the manufacture of such composite material parts.
The purpose of the present invention is what is realized by following steps:
Manufacture hard mold tooling: core model, length on the left of the stringer to match with I-shaped stringer shape are formed by machining
Core model on the right side of purlin, edge strip bottom plate under edge strip cover board and stringer in stringer；
Manufacture soft mode technique cover board；
Manufacture lower edge strip soft mode；
I-shaped stringer mandrel molding: stringer left C-shaped component is formed by core model on the left of stringer, passes through core on the right side of stringer
Mould forms c-type component on the right side of stringer；
Edge strip is flat-plate molded under I-shaped stringer: lower edge strip soft mode is placed under stringer on edge strip bottom plate, under described
Brush release agent or patch release cloth or isolation film, then the paving stringer lower edge on the lower edge strip soft mode are placed on edge strip soft mode
Bar plate；
Edge strip is flat-plate molded in I-shaped stringer: the edge strip plate in direct paving stringer on edge strip cover board in stringer；
The molding of stringer spill item: the bed of material is rolled into solid pole, is then pressed into triangle or directly in forming machine using drawing and extrusion
Pull-up is extruded into triangular shaped to form spill item；
I-shaped stringer tooling combination: by core model on the left of the stringer with stringer left C-shaped component and with C on the right side of stringer
Core model is put by I-shaped on the right side of the stringer of type component combines, and is placed under stringer on edge strip plate, then that paving is long
Edge strip cover board is placed on core model and stringer right side core model top, the C on the left of stringer on the left of stringer in the stringer of edge strip plate on purlin
Type component is put into spill item between edge strip plate under edge strip plate or stringer in c-type component and stringer on the right side of stringer；
Vacuum bag processed: isolation film and airfelt are placed in assembled I-shaped stringer tooling, pastes vacuum bag；
Solidification: checking vacuum leak situation before entering tank, is solidified after reaching requirement into autoclave；And
Demoulding: product is removed after the completion of solidification.
Wherein, the step of manufacture soft mode technique cover board includes:
Paver: carbon fiber prepreg is layered under stringer on edge strip bottom plate；
Vacuum bag processed: isolation film and airfelt are placed on the carbon fiber prepreg completed, then pastes vacuum bag；
Solidification: checking vacuum leak situation before entering tank, is solidified after reaching requirement into autoclave；
Demoulding: by the soft mode technique cover board being cured, edge strip bottom plate is removed under stringer；And
Machining: trimming processing is carried out to technique cover board, removes burrs on edges.
Wherein, the step of edge strip soft mode, includes: under manufacturing
Paver: lower edge strip soft mode material is layered under stringer on edge strip bottom plate, is placed on lower edge strip soft mode material
The soft mode technique cover board, the mold face brush release agent or patch release cloth or placement isolation film of the soft mode technique cover board；
Vacuum bag processed: isolation film is placed on the lower edge strip soft mode material and the soft mode technique cover board completed and is breathed freely
Then felt pastes vacuum bag；
Solidification: checking vacuum leak situation before entering tank, is solidified after reaching requirement into autoclave；
Demoulding: the lower edge strip soft mode of curing molding is removed on edge strip bottom plate under stringer；And
Machining: being machined out lower edge strip soft mode, removes burrs on edges.
Wherein, the lower edge strip soft mode material is silicon rubber or AIRPAD.
Wherein, the step of I-shaped stringer mandrel molding includes:
Using automated tape-laying or the method paving left planar of automatic fiber placement, then by core model on the left of stringer using heat every
Left planar is bent into stringer left C-shaped component or the direct hand on core model on the left of the stringer by film or the method for manual bending
It is paved into stringer left C-shaped component described in type.
Using automated tape-laying or the method paving right planar of automatic fiber placement, then by core model on the right side of stringer using heat every
Right planar is bent on the right side of stringer c-type component or the direct hand on core model on the right side of the stringer by film or the method for manual bending
It is paved into c-type component on the right side of stringer described in type.
Advantages of the present invention:
The advantages of remaining the surface quality of workpieces and shape control that hard-hard composable mold has, the presentation quality of part
Preferably, and under stringer lower edge strip soft mode is increased on edge strip bottom plate, not will lead to the generation of the internal flaw of part in this way,
Even for relatively thin part, the Forming Quality of part can be also improved, while also reducing the accuracy of manufacture of forming frock and matching
The requirement for closing precision, to reduce the manufacturing cost of part.
Meanwhile it is suitable for T-shaped hat part manufacture.
Detailed description of the invention
Other feature and advantage of the invention will be more preferable by the preferred embodiment being described in detail below in conjunction with attached drawing
Ground understands, in which:
Fig. 1 shows the schematic diagram of I-shaped stringer and forming frock；
Fig. 2 shows under stringer on edge strip bottom plate paving soft mode technique cover board schematic diagram；
Fig. 3 shows the paving schematic diagram of lower edge strip soft mode；
Fig. 4 shows the structural schematic diagram of I-shaped stringer；
Fig. 5 shows the schematic diagram of I-shaped stringer mandrel molding；
Fig. 6 shows the schematic diagram that edge strip is flat-plate molded under I-shaped stringer；
Fig. 7 shows the schematic diagram that edge strip is flat-plate molded in I-shaped stringer；And
Fig. 8 shows the assembled schematic diagram of I-shaped stringer mold.
Specific embodiment
In the following detailed description of the preferred embodiment, reference is constituted to the appended attached drawing of present invention a part.Institute
Attached attached drawing, which has been illustrated by way of example, can be realized specific embodiment.Exemplary embodiment is not intended to
Exhaustive all embodiments according to the present invention.It is appreciated that without departing from the scope of the present invention, can use other
Embodiment can also carry out the modification of structure or logic.
In conjunction with shown in Fig. 1 to Fig. 8, the I-shaped stringer moulding process of composite material according to the present invention is shown, including
Step:
It manufactures hard mold tooling: as shown in fig. 1, the length to match with I-shaped 5 shape of stringer being formed by machining
Core model 1 on the left of purlin, core model 2 on the right side of stringer, edge strip bottom plate 4 under edge strip cover board 3 and stringer in stringer.
Manufacture soft mode technique cover board 6, as shown in Figure 2, manufacture soft mode technique cover board 6 comprising steps of
(1) paver: carbon fiber prepreg is layered under stringer on edge strip bottom plate 4, and prepreg tooling type face is wide；
(2) vacuum bag processed: isolation film and airfelt are placed on the carbon fiber prepreg completed, then pastes vacuum bag；
(3) solidify: checking vacuum leak situation before entering tank, solidified after reaching requirement into autoclave；
(4) demould: by the soft mode technique cover board 6 being cured, edge strip bottom plate 4 is removed under stringer, and by soft mode technique cover board
6 mold face is labeled as the face A；And
(5) it machines: trimming processing being carried out to soft mode technique cover board 6, flushes it with lower edge strip bottom edge, as again
The positioning datum of secondary assembly, and remove burrs on edges.
Manufacture lower edge strip soft mode 7, as shown in Figure 3, manufacture lower edge strip soft mode 7 comprising steps of
(1) lower edge strip soft mode material (for example, silicon rubber or AIRPAD) paver: is layered on edge strip bottom plate 4 under stringer
On, soft mode technique cover board 6 is placed on lower edge strip soft mode material, has brushed soft mode technique cover board 6 under the A face paste of release agent
The upper surface of edge strip soft mode material；
(2) vacuum bag processed: isolation film is placed on the lower edge strip soft mode material and soft mode technique cover board 6 completed and is breathed freely
Then felt pastes vacuum bag；
(3) solidify: checking vacuum leak situation before entering tank, solidified after reaching requirement into autoclave；
(4) it demoulds: the lower edge strip soft mode 7 of curing molding being removed on edge strip bottom plate 4 under stringer, to lower edge strip soft mode 7
It is labeled as the face B with the mold face of edge strip bottom plate 4 under stringer, is labeled as the face A with the molding face of soft mode technique cover board 6；And
(5) it machines: lower edge strip soft mode 7 is machined out, make 4 end face of edge strip bottom plate under its end and stringer,
Benchmark as reposition.
I-shaped stringer mandrel molding: as shown in Fig. 4 to Fig. 5, stringer left C-shaped is formed by core model 1 on the left of stringer
Component 8 forms c-type component 9 on the right side of stringer by core model 2 on the right side of stringer.Preferably, using the side of automated tape-laying or automatic fiber placement
Then method paving left planar is rolled over left planar using the method for hot diaphragm or manual bending by core model 1 on the left of stringer
It curves stringer left C-shaped component 8 or directly hand is paved into type stringer left C-shaped component 8 on core model 1 on the left of the stringer；Using certainly
Then the method paving right planar of dynamic laying or automatic fiber placement is rolled over by core model 2 on the right side of stringer using hot diaphragm or by hand
Right planar is bent on the right side of stringer c-type component 9 to curved method or directly hand is paved into described in type on core model 2 on the right side of the stringer
C-type component 9 on the right side of stringer.
Edge strip is flat-plate molded under I-shaped stringer: as shown in Figure 6, lower edge strip soft mode 7 being placed on edge strip bottom under stringer
On plate 4, edge strip bottom plate 4 under the B face paste of lower edge strip soft mode 7, brush release agent or patch release cloth or placement isolation film on the face A,
Then the edge strip plate 11 under paving stringer on lower edge strip soft mode 7.
Edge strip is flat-plate molded in I-shaped stringer: as shown in Figure 7, the direct paving stringer on edge strip cover board 3 in stringer
Upper edge strip plate 10.
The molding of stringer spill item: the bed of material of one fixed width is rolled into solid pole, triangle is then pressed into or directly exists
Forming machine using drawing and extrusion pull-up is extruded into triangular shaped to form spill item 12.
I-shaped stringer tooling combination: as shown in Figure 8, by core model 1 on the left of the stringer with stringer left C-shaped component 8
It puts and combines by I-shaped with the stringer right side core model 2 with c-type component 9 on the right side of stringer, it is flat to be placed on edge strip under stringer
On plate 11, then by edge strip cover board 3 is placed on core model 1 and the stringer right side on the left of stringer in the stringer of edge strip plate 10 in paving stringer
The top of side core mould 2, wherein on the right side of stringer left C-shaped component 8, the stringer in c-type component 9 and stringer between edge strip plate 10
In gap in gap and under stringer left C-shaped component 8, stringer right side c-type component 9 and stringer between edge strip plate 11 respectively
It is put into spill item 12.
Vacuum bag processed: isolation film and airfelt are placed in assembled I-shaped stringer tooling, pastes vacuum bag；
Solidification: checking vacuum leak situation before entering tank, is solidified after reaching requirement into autoclave；And
Demoulding: product is removed after the completion of solidification.
The advantages of surface quality of workpieces and shape having present invention preserves hard-hard composable mold control, part it is outer
Appearance quality is preferable, and increases lower edge strip soft mode on edge strip bottom plate under stringer, not will lead to the internal flaw of part in this way
Generation can also improve the Forming Quality of part even for relatively thin part, while also reduce forming frock manufacture essence
The requirement of degree and cooperation precision, to reduce the manufacturing cost of part.Meanwhile it is suitable for T-shaped, hat part
Manufacture.
The technology contents and technical characterstic of specific embodiments of the present invention are had revealed that above, it being understood, however, that in this hair
Under bright creative ideas, those skilled in the art can be to various features disclosed above and the feature not being explicitly illustrated herein
Combination make various changes and improve, but belong to protection scope of the present invention.The description of above-described embodiment be exemplary and
It is not limiting, protection scope of the present invention is determined by claim.
Claims (6)
1. a kind of I-shaped stringer moulding process of composite material, which is characterized in that comprising steps of
Manufacture hard mold tooling: by machining formed core model (1) on the left of the stringer to match with I-shaped stringer (5) shape,
Core model (2) on the right side of stringer, edge strip bottom plate (4) under edge strip cover board (3) and stringer in stringer；
It manufactures soft mode technique cover board (6)；
Manufacture lower edge strip soft mode (7)；
I-shaped stringer mandrel molding: stringer left C-shaped component (8) are formed by core model (1) on the left of stringer, by the right side of stringer
Core model (2) forms c-type component (9) on the right side of stringer；
Edge strip is flat-plate molded under I-shaped stringer: lower edge strip soft mode (7) is placed under stringer on edge strip bottom plate (4), described
Brush release agent or patch release cloth or placement isolation film, the then paving on the lower edge strip soft mode (7) on lower edge strip soft mode (7)
Edge strip plate (11) under stringer；
Edge strip is flat-plate molded in I-shaped stringer: the edge strip plate (10) in direct paving stringer on edge strip cover board (3) in stringer；
The molding of stringer spill item: being rolled into solid pole for the bed of material, is then pressed into triangle or directly pulls up in forming machine using drawing and extrusion
It is extruded into triangular shaped to form spill item (12)；
I-shaped stringer tooling combination: will be with core model (1) on the left of the stringer of stringer left C-shaped component (8) and with the stringer right side
Core model (2) is put by I-shaped on the right side of the stringer of side c-type component (9) combines, and is placed under stringer on edge strip plate (11),
Then by edge strip cover board (3) is placed on core model (1) and the stringer right side on the left of stringer in the stringer of edge strip plate (10) in paving stringer
Above side core mould (2), wherein the edge strip plate in stringer left C-shaped component (8), stringer right side c-type component (9) and stringer
(10) or under stringer spill item (12) are put between edge strip plate (11)；
Vacuum bag processed: isolation film and airfelt are placed in assembled I-shaped stringer tooling, pastes vacuum bag；
Solidification: checking vacuum leak situation before entering tank, is solidified after reaching requirement into autoclave；And
Demoulding: product is removed after the completion of solidification.
2. the I-shaped stringer moulding process of composite material according to claim 1, which is characterized in that manufacture soft mode Technological cover
The step of plate (6) includes:
Paver: carbon fiber prepreg is layered under stringer on edge strip bottom plate (4)；
Vacuum bag processed: isolation film and airfelt are placed on the carbon fiber prepreg completed, then pastes vacuum bag；
Solidification: checking vacuum leak situation before entering tank, is solidified after reaching requirement into autoclave；
Demoulding: by the soft mode technique cover board (6) being cured, edge strip bottom plate (4) is removed under stringer；And
Machining: trimming processing is carried out to soft mode technique cover board (6), removes burrs on edges.
3. the I-shaped stringer moulding process of composite material according to claim 2, which is characterized in that manufacture lower edge strip soft mode
(7) the step of includes:
Paver: lower edge strip soft mode material is layered under stringer on edge strip bottom plate (4), places institute on lower edge strip soft mode material
State soft mode technique cover board (6), the mold face brush release agent or patch release cloth or placement isolation film of the soft mode technique cover board (6)；
Vacuum bag processed: placing isolation film and airfelt on the lower edge strip soft mode material and the soft mode technique cover board (6) completed,
Then vacuum bag is pasted；
Solidification: checking vacuum leak situation before entering tank, is solidified after reaching requirement into autoclave；
Demoulding: the lower edge strip soft mode (7) of curing molding is removed on edge strip bottom plate (4) under stringer；And
Machining: being machined out lower edge strip soft mode (7), removes burrs on edges.
4. the I-shaped stringer moulding process of composite material according to claim 3, which is characterized in that the lower edge strip soft mode
Material is silicon rubber or AIRPAD.
5. the I-shaped stringer moulding process of composite material according to claim 1, which is characterized in that I-shaped stringer core model
The step of molding includes:
Using automated tape-laying or the method paving left planar of automatic fiber placement, then by core model (1) on the left of stringer using heat every
Left planar is bent into stringer left C-shaped component (8) or on the left of the stringer on core model (1) by film or the method for manual bending
Direct hand is paved into stringer left C-shaped component (8) described in type.
6. the I-shaped stringer moulding process of composite material according to claim 1, which is characterized in that I-shaped stringer core model
The step of molding includes:
Using automated tape-laying or the method paving right planar of automatic fiber placement, then by core model (2) on the right side of stringer using heat every
Right planar is bent on the right side of stringer c-type component (9) or on the right side of the stringer on core model (2) by film or the method for manual bending
Direct hand is paved into c-type component (9) on the right side of stringer described in type.
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| CN114953506A (en) * | 2022-05-24 | 2022-08-30 | 上海晟纤复合材料科技有限公司 | Co-curing forming method for I-shaped reinforced wall plate made of composite material |
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| CN113146732B (en) * | 2020-04-03 | 2022-01-18 | 常州市新创智能科技有限公司 | I-shaped stringer punching process, equipment and punching mechanism thereof |
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| CN111958884A (en) * | 2020-08-17 | 2020-11-20 | 沈阳飞机工业（集团）有限公司 | Composite material large-scale wing I-shaped stringer wallboard forming tool |
| CN112479720A (en) * | 2020-12-14 | 2021-03-12 | 西安鑫垚陶瓷复合材料有限公司 | C/SiC composite material I-beam integral forming tool and forming process |
| CN114953506A (en) * | 2022-05-24 | 2022-08-30 | 上海晟纤复合材料科技有限公司 | Co-curing forming method for I-shaped reinforced wall plate made of composite material |
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Application publication date: 20181211 |