CN106079486B - A kind of flexible die and preparation method thereof of forming composite stringer - Google Patents
A kind of flexible die and preparation method thereof of forming composite stringer Download PDFInfo
- Publication number
- CN106079486B CN106079486B CN201610600700.3A CN201610600700A CN106079486B CN 106079486 B CN106079486 B CN 106079486B CN 201610600700 A CN201610600700 A CN 201610600700A CN 106079486 B CN106079486 B CN 106079486B
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- Prior art keywords
- flexible
- stringer
- rigid
- rigid matrix
- shaped
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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
- B29C70/54—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
- 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
- B29C33/3842—Manufacturing moulds, e.g. shaping the mould surface by machining
-
- 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
- B29C70/345—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 matched moulds
Abstract
The invention belongs to technique manufacturing field, more particularly to one kind can ensure that solidification process impressed pressure effectively transmits, effective control hierarchy and porosity defects, while ensuring the mold and preparation method thereof of the forming composite stringer of product dimensional accuracy.The flexible die includes at least one forming unit；The section of the forming unit is L-shaped or C-shaped, the L-shaped forming unit include at least one flexible module and two rigid matrixs, the C-shaped forming unit, including at least two flexible modules and three rigid matrixs.The invention has the advantages that can effectively control hierarchy and porosity defects, be conducive to mold positioning, it is ensured that the axis degree and straightness of stringer；It can be assembled to avoid the violence of mold, reduce labor intensity, improve working efficiency；Using segmental structure, the piecemeal of flexible die will be more flexible.
Description
Technical field
The invention belongs to technique manufacturing field, more particularly to one kind can ensure that solidification process impressed pressure effectively transmits, has
Control hierarchy and porosity defects are imitated, while ensuring mold and its preparation side of the forming composite stringer of product dimensional accuracy
Method.
Background technology
L-shaped, T shapes, J-shaped, C-shaped and work shape stringer etc. are widely used in Composite Material Stiffened Panel, Stiffened wall
Plate generally uses co-curing or is glued global formation altogether.In forming process, mold is for effectively transmitting impressed pressure, control point
Layer and porosity defects ensure that dimensional accuracy is most important, especially stringer molding die.Currently, field of compound material is adopted extensively
It is rigid die or rubber soft mode.Rigid die is primarily referred to as the big mold of rigidity, such as metal（Aluminium alloy, ordinary steel,
Invar steel etc.）And the mold of the materials such as composite material.The shadow that prepreg is flowed by impressed pressure and resin in the curing process
Sound can cause thickness to reduce, and stringer will appear thickness in flange and web both direction and reduce, therefore rigid die may
There is both direction and move unmatched situation, so as to cause local bridge formation, and then impressed pressure is not delivered to position, final to occur
Siding stringer is layered and porosity defects.Rubber soft mode is mainly the mold using vulcanized rubber material, this mold stiffness is small, solid
It is easily deformed during changing, to solve the problems, such as that mold is unmatched in the movement of stringer both direction, it is ensured that impressed pressure is effective
It transmits, to avoid layering and porosity defects.But since rubber soft mode rigidity is small, assembling process and cured before curing
It is difficult to position in journey, is susceptible to long joist axial line degree and the case where straightness is unsatisfactory for requiring, in addition, the surface quality of its product
It is bad.
Invention content
To solve the above-mentioned problems, the object of the present invention is to provide a kind of simple in structure, it is ensured that solidification process impressed pressure
Effectively transmitted on stringer flange and web, effective control hierarchy and porosity defects, at the same ensure product dimensional accuracy at
The flexible die and preparation method thereof of type composite material stringer.
The technical scheme is that：A kind of flexible die of forming composite stringer, the flexible die include at least
One forming unit；The section of the forming unit is L-shaped or C-shaped, the L-shaped forming unit include at least one flexibility
Module and two rigid matrixs are connected by one piece of flexible module between two rigid matrixs, it is L-shaped it is described at
The end at type unit both ends is rigid matrix；
The C-shaped forming unit, including at least two flexible modules and three rigid matrixs, it is two neighboring described rigid
Property module between connected by one piece of flexible module, the end at the C-shaped forming unit both ends is rigid matrix；
Wherein, the rigid matrix corresponds to composite material stringer flange and web uniform thickness region, and the flexible module corresponds to
Composite material stringer corner region and thickness change transitional region.
Further, the size of the flexible module is more than its corresponding composite material stringer corner region and flange and web
The size of thickness change transitional region, the rigid matrix is less than its corresponding composite material stringer flange and web uniform thickness area
Domain.
Further, it is connected using joinery and its construction between the flexible module and rigid matrix, is used in entire flexible die
In life cycle, the connection is non-dismountable.
Further, which includes the connection unit for being connected with each other several forming units, and the connection unit is
Flexible connecting member, the flexible connecting member are connect using joinery and its construction with the forming unit.
It is a further object of the present invention to provide the technique for preparing above-mentioned flexible die, which specifically includes following step
Suddenly：
Step 1. molded rigid module：According to the suitable metal material of designed rigid matrix selection of dimension or composite wood
Material, the working face of metal material rigid matrix are finished using numerically-controlled machine tool；The working face of composite material rigid matrix by
Its cure stage molding die determines that composite material shaping mould is finished using numerically-controlled machine tool.According to molding stringer web and
Rigid matrix cuts in flange uniform thickness area size, and processes the interface for mortise-tenon joint at the edge of rigid matrix；
Step 2:Rigid matrix is prepared in step 1 and is placed and secured in its molding die corresponding position, according to rigidity
After half finished rubber is cut into corresponding suitable dimension by the size of module, filling turning, Varying-thickness region and rigid matrix pre-add
The interface of work.After filling, it is packaged according to composite material autoclave process, then to half finished rubber in autoclave
Vulcanized, vulcanization system is：It is less than -0.09MPa in vacuum degree, pressure is：Under 0.5MPa, by temperature from room temperature with 2 DEG C/
Min rises to 180 DEG C, and constant temperature is down to room temperature to get to the flexible die of forming composite stringer after 2 hours.
The beneficial effects of the invention are as follows：Due to the adoption of the above technical scheme, the invention has the characteristics that：
1）Relative to rigid die, the movement that the rigid matrix of flexible die can be relatively independent, mutually constraint are smaller, it is ensured that
Mold is not built bridge in solidification process, realizes that solidification process impressed pressure effectively transmits on stringer flange and web, effectively
Control hierarchy and porosity defects；
2）Relative to rubber soft mode, uniform thickness flat area is covered by rigid matrix, can ensure that surface quality, in addition rigid mould
The use of block can design simultaneously processing and positioning device on rigid matrix, be advantageously implemented mold positioning, it is ensured that the axis degree of stringer
And straightness；
3）The working surface of traditional moulds, especially stringer corner region radius are according to composite product ruler after solidification
Very little design.There are thickness change before and after curing due to composite material, curing the size difference of front mold and prepreg overlay causes
The two mismatches, and assembling is difficult.Flexible die, especially flexible module rigidity is small, and solidification process can be adapted in advance by deforming
Leaching material overlay thickness variation, therefore, the working surface of flexible die can be according to prepreg overlay profile designs before solidification, can be with
It is logical that the violence of mold is avoided to assemble, reduce labor intensity, improves working efficiency；
4）Currently, generally using segmental structure for longer stringer molding die, the piecemeal of flexible die will be cleverer
Living, the operation is more convenient.
Description of the drawings
Fig. 1 is that L-shaped composite material stringer is molded flexible die schematic diagram.
Fig. 2 is the structural schematic diagram that flexible module uses that joinery and its construction is connect with rigid matrix.
Fig. 3 solidification process stringer thickness change transitional region flexible die operation principle schematic diagrams.（Fig. 3 a be solidification before,
Fig. 3 b are after curing）.
Fig. 4 solidification process stringer corner region flexible die operation principle schematic diagrams.（Fig. 4 a be solidification before, Fig. 4 b be solid
After change）.
Fig. 5 is C-shaped stringer shaping schematic view.
Fig. 6 is T shape stringer shaping schematic views.
Fig. 7 is work shape stringer shaping schematic view.
Fig. 8 is J-shaped stringer shaping schematic view.
In figure：
1. flexible module, 2. rigid matrixs, 3. non-uniform thickness prepreg overlays, 4. solidification after non-uniform thickness composite structure,
L-shaped composite structure after 5.L shapes prepreg overlay, 6. solidifications.
Specific implementation mode
Technical scheme of the present invention is described further with reference to specific embodiment.
As shown in Figs. 1-2, a kind of flexible die of forming composite stringer of the present invention, the flexible die include at least one
A forming unit；The section of the forming unit is L-shaped, the L-shaped forming unit include at least one flexible module and
Two rigid matrixs pass through one piece of flexible module connection, the L-shaped forming unit between two rigid matrixs
End is rigid matrix；
Wherein, the rigid matrix corresponds to composite material stringer flange and web uniform thickness region, and the flexible module corresponds to
Composite material stringer corner region and thickness change transitional region.
The size of the flexible module is more than its corresponding composite material stringer corner region and flange and becomes with web thickness
Change transitional region, the size of the rigid matrix is less than its corresponding composite material stringer flange and web uniform thickness region.
It is connected using joinery and its construction between the flexible module and rigid matrix, in the entire flexible die service life period
Interior, the connection is non-dismountable.
Segmented version may be used along composite material stringer length direction in the flexible die, the quantity and length of segmentation with
Staff's energy hand operation is advisable；Preferably, sectional area selection is in thickness change transitional region along its length；Especially
Ground, if a certain uniform thickness region is excessive along its length, it should be segmented in uniform thickness region.The flexible die includes being used for
The connection unit that several forming units are connected with each other, the connection unit are flexible connecting member, and the flexible connecting member uses
Joinery and its construction is connect with the forming unit.The flexible connecting member is detachable.
Preferably, it can be designed on rigid matrix and processing and positioning device, during forming composite stringer, cooperation is auxiliary
Assistant engineer fills, it can be ensured that the axis degree and straightness of stringer.
A kind of technique preparing flexible die, the technique specifically include following steps：
Step 1. molded rigid module：According to the suitable metal material of designed rigid matrix selection of dimension or composite wood
Material, the working face of metal material rigid matrix are finished using numerically-controlled machine tool；The working face of composite material rigid matrix by
Its cure stage molding die determines that composite material shaping mould is finished using numerically-controlled machine tool.According to molding stringer web and
Rigid matrix cuts in flange uniform thickness area size, and processes the interface for mortise-tenon joint at the edge of rigid matrix；
Step 2:Rigid matrix is prepared in step 1 and is placed and secured in its molding die corresponding position, according to rigidity
After half finished rubber is cut into corresponding suitable dimension by the size of module, filling turning, Varying-thickness region and rigid matrix pre-add
The interface of work.After filling, it is packaged according to composite material autoclave process, then to half finished rubber in autoclave
Vulcanized, vulcanization system is：It is less than -0.09MPa in vacuum degree, pressure is：Under 0.5MPa, by temperature from room temperature with 2 DEG C/
Min rises to 180 DEG C, and constant temperature is down to room temperature to get to the flexible die of forming composite stringer after 2 hours.
As shown in figure 3, solidification process stringer thickness change transitional region flexible die operation principle schematic diagram of the present invention, long
Purlin thickness change transitional region flexible die operation principle：
After non-3 paving of uniform thickness prepreg overlay, flexible die is placed on non-uniform thickness prepreg overlay 3.Flexible die
Tool uses rigid matrix 2 in composite material stringer uniform thickness region, in composite material stringer thickness change transitional region using flexible
Module 1, as shown in Figure 3.Before solidification, the thickness of non-uniform thickness prepreg overlay 3 is more than non-uniform thickness composite structure 4 after solidification
Thickness.In solidification process, impressed pressure is transmitted to by flexible die on non-uniform thickness prepreg overlay 3, non-uniform thickness prepreg paving
3 compaction rate of layer increase, and thickness is gradually reduced.Rigid matrix 2 is under the action of outer plus-pressure with non-uniform thickness prepreg overlay 3
Thickness reduce and moved respectively along 3 slab region of non-uniform thickness prepreg overlay and caul plate area surface normal.Due to non-uniform thickness
3 slab region of prepreg overlay is different with the original depth of caul plate area, two 3 thickness of region prepreg overlay in solidification process
Changing value is different, causes two 2 amount of movements of area rigid module unequal.Since 1 rigidity of flexible module is smaller, to match slab
Region and the different amount of movement of caul plate area rigid matrix 2, under impressed pressure effect, corresponding deformation occurs for flexible module 1, really
Guarantor fits closely non-uniform thickness prepreg overlay 3, effectively transmits impressed pressure, to ensure stringer thickness change transitional region, thin plate
Region with and slab region be pressurized it is uniform.In the whole process, due to the presence of flexible module 1, slab region and caul plate area
Corresponding rigid matrix 2 can relative to freely move to match slab region and caul plate area different-thickness changing value, each other
Constraint is smaller, avoids such as conventional rigid mold from moving unmatched problem in stringer slab region and caul plate area, and then go out
It now builds bridge, influences pressure transmission, composite structure is caused after solidification to occur being layered and porosity defects etc..
As shown in figure 4, solidification process stringer corner region flexible die operation principle schematic diagram of the present invention, stringer turning
Regional flexibility mold working principle is：
After 5 paving of L-shaped prepreg overlay, flexible die is placed on L-shaped prepreg overlay 5.Flexible die is multiple
Condensation material stringer flange and web uniform thickness region use rigid matrix 2, and flexible module is used in composite material stringer corner region
1, as shown in Figure 4.Before solidification, the thickness of L-shaped prepreg overlay 5 is more than 6 thickness of L-shaped composite structure after solidification.Cured
Cheng Zhong, impressed pressure are transmitted to by flexible die on L-shaped prepreg overlay 5, and 5 compaction rate of L-shaped prepreg overlay increases, thick
Degree is gradually reduced.Flange and the rigid matrix of web region 2 are respectively under the action of outer plus-pressure with L-shaped prepreg overlay 5
Thickness reduce and moved respectively along 5 flange of L-shaped prepreg overlay and web region surface normal.Flange and web region it is rigid
Property module 2 is moved along two different directions, while radius size of the stringer corner region close to 1 side of flexible module becomes larger.
Since 1 rigidity of flexible module is smaller, for the amount of movement and corner regions of matching flange and 2 different directions of web region rigid matrix
Change in size, under impressed pressure effect, corresponding deformation occurs for flexible module 1, it is ensured that fits closely L-shaped prepreg overlay 5, has
Effect transmits impressed pressure, to ensure that it is uniform that stringer web region, lug area and corner region are pressurized.In the whole process, by
In the presence of flexible module 2, the rigid matrix 2 of web and lug area can relative to freely moving, constrain to each other it is smaller,
To realize that it is uniform that stringer web region, lug area and corner region are pressurized, layering and porosity defects etc. are avoided.
In this illustration, L-shaped stringer prepreg overlay web is equal with the thickness of lug area, and the flexible die is same
Suitable for L-shaped stringer prepreg overlay web and the unequal situation of lug area thickness.
As shown in figure 5, the present invention is molded C-shaped stringer schematic diagram, the flexible die of molding C-shaped stringer is one C-shaped
Forming unit.
As shown in fig. 6, the forming T-shaped stringer schematic diagram of the present invention, the flexible die of forming T-shaped stringer by 2 it is L-shaped at
Type unit forms.
As shown in fig. 7, the present invention is molded work shape stringer schematic diagram, the flexible die for being molded work shape stringer is C-shaped by 2
Forming unit forms.
As shown in figure 8, the present invention is molded J-shaped stringer schematic diagram, the flexible die for being molded J-shaped stringer is C-shaped by one
Forming unit and a L-shaped forming unit composition.
One embodiment of the present invention has been described in detail above, but the content be only the present invention preferable implementation
Example should not be construed as limiting the practical range of the present invention.It is all according to all the changes and improvements made by the present patent application range
Deng should all still fall within the scope of the patent of the present invention.
Claims (5)
1. a kind of flexible die of forming composite stringer, which is characterized in that the mold includes flexible module and rigid matrix,
Ensure that solidification process impressed pressure effectively transmits on stringer flange and web by the flexible module and rigid matrix, effectively
Control hierarchy and porosity defects, while ensuring the dimensional accuracy of composite material stringer, which includes at least one molding
Unit；The section of the forming unit is L-shaped or C-shaped；
Wherein, the L-shaped forming unit includes at least one flexible module and two rigid matrixs, two rigid moulds
It is connected by one piece of flexible module between block, the L-shaped forming unit end is rigid matrix；
The C-shaped forming unit, including at least two flexible modules and three rigid matrixs, the two neighboring rigid mould
It is connected by one piece of flexible module between block, the C-shaped forming unit end is rigid matrix；
The rigid matrix corresponds to composite material stringer flange and web uniform thickness region, and it is long that the flexible module corresponds to composite material
Purlin corner region and thickness change transitional region.
2. flexible die according to claim 1, which is characterized in that it is corresponding multiple that the size of the flexible module is more than its
Condensation material stringer corner region and flange change transitional region with web thickness, and the size of the rigid matrix is corresponding less than its
Composite material stringer flange and web uniform thickness region.
3. flexible die according to claim 1, which is characterized in that use tenon between the flexible module and rigid matrix
Fourth of the twelve Earthly Branches structure connection, within the entire flexible die service life period, the connection is non-dismountable.
4. according to the flexible die described in claim 1-3 any one claims, which is characterized in that the mold includes being used for
The connection unit that several forming units are connected with each other, the connection unit are flexible connecting member, and the flexible connecting member uses
Joinery and its construction is connect with the forming unit.
5. a kind of technique preparing the flexible die as described in claim 1-4 any one claims, the technique are specifically wrapped
Include following steps：
Step 1. molded rigid module：According to the suitable metal material of designed rigid matrix selection of dimension or composite material,
The working face of metal material rigid matrix is finished using numerically-controlled machine tool；The working face of composite material rigid matrix is consolidated by it
Change stage molding die determines that composite material shaping mould is finished using numerically-controlled machine tool,
Rigid matrix is cut according to molding stringer web and flange uniform thickness area size, and use is processed at the edge of rigid matrix
In the interface of mortise-tenon joint；
Step 2:Rigid matrix is prepared in step 1 and is placed and secured in its molding die corresponding position, according to rigid matrix
Size half finished rubber is cut into corresponding suitable dimension after, filling turning, Varying-thickness region and rigid matrix preprocessing
Interface；It after filling, is packaged according to composite material autoclave process, then half finished rubber is carried out in autoclave
Vulcanization, vulcanization system are：It is less than -0.09MPa in vacuum degree, pressure is：Under 0.5MPa, by temperature from room temperature with 2 DEG C/min
Rise to 180 DEG C, constant temperature is down to room temperature to get to the flexible die of forming composite stringer after 2 hours.
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| CN201610600700.3A CN106079486B (en) | 2016-07-27 | 2016-07-27 | A kind of flexible die and preparation method thereof of forming composite stringer |
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|---|---|---|---|
| CN201610600700.3A CN106079486B (en) | 2016-07-27 | 2016-07-27 | A kind of flexible die and preparation method thereof of forming composite stringer |
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| CN106079486B true CN106079486B (en) | 2018-07-17 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108688192B (en) * | 2017-04-12 | 2020-11-03 | 深圳市泰格尔航天航空科技有限公司 | C-shaped beam composite material forming tool and composite material C-shaped beam forming method |
| CN107253334B (en) * | 2017-04-28 | 2023-03-21 | 中国商用飞机有限责任公司北京民用飞机技术研究中心 | Die and process for forming T-shaped stringer stiffened wallboard made of composite material |
| CN107300160A (en) * | 2017-07-12 | 2017-10-27 | 湖南粤港模科实业有限公司 | A kind of mould bar of flexible sizing of separate type and the mould bar group being made up of it |
| CN111284038A (en) * | 2018-12-07 | 2020-06-16 | 中航贵州飞机有限责任公司 | Liquid forming method of ribbed composite material part for unmanned aerial vehicle |
| CN111284036A (en) * | 2018-12-07 | 2020-06-16 | 中航贵州飞机有限责任公司 | Co-curing forming method of composite material wall plate with hat-shaped ribs for unmanned aerial vehicle |
| CN111421715A (en) * | 2020-03-30 | 2020-07-17 | 成都飞机工业（集团）有限责任公司 | Mold for sewing RFI liquid molding cap-shaped ribs and preparation method thereof |
| CN112536946B (en) * | 2020-11-20 | 2022-11-11 | 上海复合材料科技有限公司 | Composite material conical section forming die pressurized by using soft die |
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| CN102909866A (en) * | 2012-10-24 | 2013-02-06 | 中国航空工业集团公司北京航空材料研究院 | Method for forming control of long joist axial line of composite material stiffened wall panel |
| CN104072822A (en) * | 2014-07-09 | 2014-10-01 | 大康控股集团有限公司 | Elastic rubber part for chair back connection and processing technology |
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| CN205836041U (en) * | 2016-07-27 | 2016-12-28 | 中国商用飞机有限责任公司北京民用飞机技术研究中心 | A kind of flexible die of forming composite stringer |
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| CN102909866A (en) * | 2012-10-24 | 2013-02-06 | 中国航空工业集团公司北京航空材料研究院 | Method for forming control of long joist axial line of composite material stiffened wall panel |
| CN104072822A (en) * | 2014-07-09 | 2014-10-01 | 大康控股集团有限公司 | Elastic rubber part for chair back connection and processing technology |
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