CN113665095A - Forming die and method for reducing internal defects of composite material wound product - Google Patents
Forming die and method for reducing internal defects of composite material wound product Download PDFInfo
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- CN113665095A CN113665095A CN202111227997.0A CN202111227997A CN113665095A CN 113665095 A CN113665095 A CN 113665095A CN 202111227997 A CN202111227997 A CN 202111227997A CN 113665095 A CN113665095 A CN 113665095A
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- revolving body
- upper shell
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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
- B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
- B29C53/80—Component parts, details or accessories; Auxiliary operations
- B29C53/82—Cores or mandrels
- B29C53/821—Mandrels especially adapted for winding and joining
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Abstract
The invention relates to a forming die and a method for reducing the internal defects of a composite material wound product; comprises a revolving body core die and an outer female die wrapping the revolving body core die; the revolution body core mould comprises an inner core and core shafts arranged at two ends of the inner core, the vulva mould comprises an upper shell and a lower shell which are matched with the inner core, the upper shell and the lower shell are folded and wrap the inner core, and the upper shell and the lower shell are connected in a sealing way through a sealing connecting piece; a filling gap is arranged between the inner walls of the upper shell and the lower shell and the outer wall of the inner core, a glue inlet is arranged on the lower shell, and a glue outlet is arranged on the upper shell; the technical problems that when the composite material product with a revolving body structure is prepared by adopting a winding process in the prior art, the automatic winding continuous fibers are overhead near a polar hole area and a fiber intersection point, and the defects of gaps, uneven resin distribution and the like are easily caused by resin flowing in a curing stage are solved through the design of the forming die for reducing the internal defects of the composite material wound product.
Description
Technical Field
The invention relates to the technical field of composite material wound product preparation, in particular to a forming die and a method for reducing internal defects of a composite material wound product.
Background
Composite materials using fibers such as carbon fibers, aramid fibers, glass fibers and the like as reinforcing phases and resins such as epoxy resins, vinyl resins, polyester resins and the like as matrices have the characteristics of light weight, high strength, corrosion resistance, fatigue resistance, designability and the like, and are favored in the fields of aerospace, transportation, medical and chemical engineering and the like. The composite material has the characteristic of special material-structure integration, namely the preparation process of the material is also the realization process of the structure. Therefore, in order to fully exert the advantages of the composite material, the number, the size and the type of the internal defects need to be strictly controlled, and the load bearing capacity of the component is prevented from being attenuated.
When the composite material product with the revolving body structure is prepared by adopting the winding process, the automatic winding continuous fibers have the phenomena of aerial appearance near the polar hole region and near the fiber intersection point, and the defects of gaps, uneven resin belly and the like are easily caused by the flowing of resin in the curing stage. When the product receives loads except internal pressure, the defects become crack initiation sources due to the fact that stress can not be effectively transmitted, and the occurrence of damage modes such as layering, cracking and breaking is accelerated, so that the product fails. Especially products subjected to external pressure loads, cause the effective rigidity of the construction to decay rapidly due to the intrusion of pressure media through the internal pores, causing the failure of the component.
Therefore, in view of the above problems, the present invention is directed to a forming mold and a method for reducing internal defects of a composite material wound product.
Disclosure of Invention
The invention aims to provide a forming die and a method for reducing internal defects of a composite material wound product, and aims to solve the problems that in the prior art, when the composite material product with a revolving body structure is prepared by adopting a winding process, the automatic winding continuous fibers are overhead near a polar hole area and a fiber intersection point, and the defects of gaps, uneven resin distribution and the like are easily caused by resin flowing in a curing stage. When the product receives loads except internal pressure, the defects become crack initiation sources due to the fact that stress can not be effectively transmitted, and the occurrence of damage modes such as layering, cracking and breaking is accelerated, so that the technical problem of product failure is caused.
The invention provides a forming die for reducing internal defects of a composite material wound product, which comprises a revolving body core die for winding fibers and an outer female die wrapping the revolving body core die; the revolution body core mould comprises an inner core and core shafts arranged at two ends of the inner core, the vulva mould comprises an upper shell and a lower shell which are matched with the inner core, the upper shell and the lower shell are folded and wrap the inner core, and the upper shell and the lower shell are connected in a sealing way through a sealing connecting piece; a filling gap is arranged between the inner walls of the upper shell and the lower shell and the outer wall of the inner core, a glue inlet communicated with the filling gap is formed in the lower shell, and a glue outlet communicated with the filling gap is formed in the upper shell.
Preferably, the glue inlet and the glue outlet are respectively positioned on two sides of the longitudinal central axis of the revolving body core mold, the revolving body core mold comprises an arc-shaped section and a straight line section, and the glue inlet and the glue outlet are both positioned at the initial positions of the arc-shaped sections close to the straight line section; the line connecting the glue inlet and the glue outlet, the longitudinal central axis of the core mold of the revolving body and the transverse central axis of the core mold of the revolving body are intersected at one point.
Preferably, the sealing connecting piece comprises a first connecting flange of the outer casing upper shell and a second connecting flange of the outer casing lower shell, the first connecting flange is provided with a plurality of first connecting holes at intervals along the circumferential direction, the second connecting flange is provided with a plurality of second connecting holes at intervals along the circumferential direction, the second connecting holes correspond to the first connecting holes one by one, and fastening bolts penetrate through the first connecting holes and the second connecting holes; and a sealing ring is arranged at the joint of the first connecting flange and the second connecting flange.
Preferably, the material of the outer female die is metal.
Preferably, the material of the revolving body core mold is metal.
Preferably, a sealing gasket is arranged at the joint of each mandrel and the upper shell and the lower shell.
The invention also provides a method for reducing the internal defects of a composite material wound product, which comprises the following steps:
winding the fibers on the outer surface of the inner core by adopting the forming die, paving demolding cloth and continuous felt or a flow guide net on the surfaces of the fibers, matching the upper shell and the lower shell coated with the demolding agent on the premise of meeting the size requirement of a product, and connecting the upper shell and the lower shell in a sealing way by a sealing connecting piece;
and after the sealing performance of the forming die is checked, resin is injected from the glue inlet by adopting an RTM (resin transfer molding) process, and after the continuous and bubble-free resin flows out from the glue outlet, the injection is stopped, the curing and the demolding are carried out, so that the composite material wound product is obtained.
Preferably, the viscosity of the injected resin is 500 mPaS or less.
Preferably, before resin is injected, the core mold of the revolving body is placed obliquely, and the included angle theta between the core mold of the revolving body and the horizontal plane is 10-15 degrees.
Preferably, when the sealing performance of the molding die is checked, the resin is injected from the glue inlet after the pressure change within 5min is less than 1%.
Compared with the prior art, the forming die and the method for reducing the internal defects of the composite material wound product have the following advantages that:
1. according to the forming die for reducing the internal defects of the composite material wound product, the inner core is used for winding fibers, and after the fibers are wound, the upper shell and the lower shell are connected in a sealing manner through the sealing connecting piece after the demolding cloth and the continuous felt or the flow guide net are laid; inside injecting the winding goods with the resin through driving pressure, take out the air that surplus resin was wrapped up in with the goods through the resin flow, simultaneously with the empty space filling resin that arouses of fibre to restraint through last casing and lower casing makes the product surface form a level and smooth, fine and close, even resin layer, reduces traditional aftertreatment technology process.
2. The method for reducing the internal defects of the composite material wound product solves the problems of high porosity, uneven resin distribution, low interlayer performance and the like of a fiber wound product, improves the overall performance of the wound product, and enhances the capacity of the wound product for resisting external loads.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic structural view (front cross-sectional view) of a forming mold for reducing internal defects of a composite material wound article according to the present invention;
FIG. 2 is a schematic structural view (front cross-sectional view, inclined placement) of a forming mold for reducing internal defects of a composite material wound article according to the present invention;
fig. 3 is a structural schematic view (top cross-sectional view) of a forming die for reducing internal defects of a composite material wound product according to the present invention.
Description of reference numerals:
1. a revolving body core mold; 101. an inner core; 102. a mandrel; 2. an outer female die; 201. an upper housing; 202. a lower housing; 3. a glue inlet; 4. a glue outlet; 5. a sealing connection; 6. filling the gap; 7. a seal ring; 51. a second connecting flange; 52. and a second connection hole.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1 and 3, the present embodiment provides a forming die for reducing internal defects of a composite material wound product, including a core mandrel 1 of revolution for fiber winding and a vulva die 2 wrapping the core mandrel 1 of revolution; the revolution body core die 1 comprises an inner core 101 and a core shaft 102 arranged at two ends of the inner core 101, the vulva die 2 comprises an upper shell 201 and a lower shell 202 which are matched with the inner core 101, the upper shell 201 and the lower shell 202 are involuntarily wrapped on the inner core 101, and the upper shell 201 and the lower shell 202 are hermetically connected through a sealing connecting piece 5; a filling gap 6 is arranged between the inner walls of the upper shell 201 and the lower shell 202 and the outer wall of the inner core 101, a glue inlet 3 communicated with the filling gap is arranged on the lower shell 202, and a glue outlet 4 communicated with the filling gap is arranged on the upper shell 201.
The fiber winding device comprises a revolving body core die 1 for fiber winding and a vulva die 2 wrapping the revolving body core die 1; the revolution body core die 1 comprises an inner core 101 and a core shaft 102 arranged at two ends of the inner core 101, the vulva die 2 comprises an upper shell 201 and a lower shell 202 which are matched with the inner core 101, the upper shell 201 and the lower shell 202 are involuntarily wrapped on the inner core 101, and the upper shell 201 and the lower shell 202 are hermetically connected through a sealing connecting piece 5; a filling gap 6 is arranged between the inner walls of the upper shell 201 and the lower shell 202 and the outer wall of the inner core 101, a glue inlet 3 communicated with the filling gap is arranged on the lower shell 202, a glue outlet 4 communicated with the filling gap is arranged on the upper shell 201, the inner core 101 is used for winding fibers, and after the inner core 101 is wound, demolding cloth and continuous felt or a flow guide net are laid, the upper shell 201 and the lower shell 202 are connected in a sealing way through a sealing connecting piece 5; the resin is injected into the wound product through the driving pressure, the air wrapped by the surplus resin in the product is taken out through the resin flowing, meanwhile, the resin is filled in the gap caused by the fiber overhead, and a flat, compact and uniform resin layer is formed on the surface of the product through the constraint of the upper shell 201 and the lower shell 202, so that the traditional post-treatment process is reduced.
As shown in fig. 3, the sealing connector 5 of the present embodiment includes a first connecting flange of the outer upper housing 201, and a second connecting flange 51 of the outer lower housing 202, the first connecting flange is provided with a plurality of first connecting holes at intervals along the circumferential direction, the second connecting flange 51 is provided with a plurality of second connecting holes 52 corresponding to the first connecting holes one by one at intervals along the circumferential direction, and fastening bolts are inserted into the first connecting holes and the second connecting holes 52; the joint of the first connecting flange and the second connecting flange 51 is provided with a sealing ring 7.
Neither the first connecting flange nor the second connecting hole 52 of this embodiment is shown, which is common knowledge and will not be described herein.
According to the invention, the sealing connecting piece 5 comprises a first connecting flange of an outer sleeve upper shell 201 and a second connecting flange 51 of an outer sleeve lower shell 202, wherein a plurality of first connecting holes are distributed on the first connecting flange at intervals along the circumferential direction, a plurality of second connecting holes 52 corresponding to the first connecting holes one by one are distributed on the second connecting flange 51 at intervals along the circumferential direction, and fastening bolts are arranged in the first connecting holes and the second connecting holes 52 in a penetrating manner; the design that there is sealing washer 7 first flange and second flange 51 junction, first flange and last casing 201 rigid coupling, second flange 51 and lower casing 202 rigid coupling can be with last casing 201 and lower casing 202 close coupling, when airtight detection, guarantees forming die's gas tightness.
As shown in fig. 1, the glue inlet 3 and the glue outlet 4 of the present embodiment are respectively located on two sides of the longitudinal central axis of the core mandrel 1 of the revolving body, the core mandrel 1 of the revolving body includes an arc-shaped section and a straight-line section, and both the glue inlet 3 and the glue outlet 4 are located at the initial positions of the arc-shaped section adjacent to the straight-line section; the line connecting the glue inlet 3 and the glue outlet 4, the longitudinal central axis of the core mold 1 of the revolving body and the transverse central axis of the core mold 1 of the revolving body intersect at one point.
According to the invention, the glue inlet 3 and the glue outlet 4 are respectively positioned at two sides of the longitudinal central axis of the revolving body core mold 1, the revolving body core mold 1 comprises an arc-shaped section and a straight line section, and the glue inlet 3 and the glue outlet 4 are both positioned at the initial positions of the arc-shaped sections close to the straight line section; the design that the connecting line of the glue inlet 3 and the glue outlet 4 and the longitudinal central axis of the core mold 1 of the revolving body and the transverse central axis of the core mold 1 of the revolving body intersect at one point is adopted, when glue is injected, the glue inlet 3 is ensured to be positioned at the lowest point, the glue outlet 4 is ensured to be positioned at the highest point, the resin is ensured to be filled in the mold cavity, and the resin and air filled in the mold cavity are ensured to be discharged.
The glue inlet 3 and the glue outlet 4 are positioned at the connection part of the straight line section and the arc section.
The vulva module 2 is made of metal.
The material of the core mold 1 of the revolving body of the present invention is metal.
The joint of each mandrel 102 and the upper shell 201 and the lower shell 202 is provided with a sealing gasket 8.
The invention also provides a method for reducing the internal defects of a composite material wound product, which comprises the following steps:
s1) winding the fiber on the outer surface of the inner core 101 by using the forming die as described in any one of the above, laying the demoulding cloth and the continuous felt or the diversion net on the surface of the fiber, matching the upper shell 201 and the lower shell 202 coated with the demoulding agent on the premise of meeting the size requirement of the product, and sealing and connecting the upper shell 201 and the lower shell 202 by the sealing and connecting piece 5;
s2), after the sealing performance of the forming die is checked, resin is injected from the glue inlet 3 by adopting an RTM process, and after the resin which is continuous and has no bubbles flows out from the glue outlet, the injection is stopped, the curing and the demoulding are carried out, so that the composite material wound product is obtained.
By the method, the problems of high porosity, uneven resin distribution, low interlayer performance and the like of the fiber winding product are solved, the overall performance of the winding product is improved, and the capacity of the winding product for resisting external loads is enhanced.
The viscosity of the injected resin is less than or equal to 500 mPa.S, and the flowing compactness is ensured.
As shown in fig. 2, in this embodiment, before resin is injected, the core mold of the revolving body is placed in an inclined manner, and an included angle θ between the core mold of the revolving body and a horizontal plane is 10 to 15 ° to ensure that the glue inlet 3 is located at the lowest point and the glue outlet is located at the highest point to ensure that the cavity is filled with resin and air to be discharged.
When the sealing performance of the forming die is tested, resin is injected from the glue inlet 3 after the pressure change within 5min is less than 1%.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The utility model provides a reduce forming die of combined material winding goods internal defect which characterized in that: comprises a revolving body core die (1) for fiber winding and a vulva die (2) wrapping the revolving body core die (1); the revolving body core die (1) comprises an inner core (101) and core dies (102) arranged at two ends of the inner core (101), the vulva die (2) comprises an upper shell (201) and a lower shell (202) which are matched with the inner core (101), the upper shell (201) and the lower shell (202) are folded and wrap the inner core (101), and the upper shell (201) and the lower shell (202) are connected in a sealing mode through a sealing connecting piece (5); a filling gap (6) is arranged between the inner walls of the upper shell (201) and the lower shell (202) and the outer wall of the inner core (101), a glue inlet (3) communicated with the filling gap (6) is formed in the lower shell (202), and a glue outlet (4) communicated with the filling gap (6) is formed in the upper shell (201).
2. The forming die for reducing internal defects of a composite material wound product according to claim 1, wherein: the glue inlet (3) and the glue outlet (4) are respectively positioned at two sides of the longitudinal central axis of the revolving body core mold (1), the revolving body core mold (1) comprises an arc-shaped section and a straight line section, and the glue inlet (3) and the glue outlet (4) are both positioned at the initial positions of the arc-shaped sections close to the straight line section; the line connecting the glue inlet (3) and the glue outlet (4), the longitudinal central axis of the revolving body core mold (1) and the transverse central axis of the revolving body core mold (1) are intersected at one point.
3. The forming die for reducing internal defects of a composite material wound product according to claim 2, wherein: the sealing connecting piece (5) comprises a first connecting flange of the outer casing upper shell (201) and a second connecting flange (51) of the outer casing lower shell (202), wherein a plurality of first connecting holes are distributed on the first connecting flange at intervals along the circumferential direction, a plurality of second connecting holes (52) which are in one-to-one correspondence with the first connecting holes are distributed on the second connecting flange (51) at intervals along the circumferential direction, and fastening bolts penetrate through the first connecting holes and the second connecting holes (52); and a sealing ring (7) is arranged at the joint of the first connecting flange and the second connecting flange (51).
4. The forming die for reducing internal defects of a composite material wound product according to claim 3, wherein: the outer female die (2) is made of metal.
5. The forming die for reducing internal defects of a composite material wound product according to claim 4, wherein: the material of the revolving body core mold (1) is metal.
6. The forming die for reducing internal defects of a composite material wound product according to claim 5, wherein: and a sealing gasket (8) is arranged at the joint of each mandrel (102) and the upper shell (201) and the lower shell (202).
7. A method of reducing internal defects in a composite wound article, comprising: the method comprises the following steps:
winding fibers on the outer surface of an inner core (101) by using a forming die as claimed in any one of claims 1 to 6, paving a release fabric and a continuous felt or a flow guide net on the surfaces of the fibers, matching an upper shell (201) and a lower shell (202) coated with a release agent on the premise of meeting the size requirement of a product, and hermetically connecting the upper shell (201) and the lower shell (202) by a sealing connecting piece (5);
and after the sealing performance of the forming die is checked, resin is injected from the glue inlet (3) by adopting an RTM (resin transfer molding) process, and after the continuous bubble-free resin flows out from the glue outlet, the injection is stopped, the curing and the demoulding are carried out, so that the composite material wound product is obtained.
8. The method of reducing internal defects in a composite wound article according to claim 7, wherein: the viscosity of the injected resin is less than or equal to 500 mPas.
9. The method of reducing internal defects in a composite wound article according to claim 8, wherein: before resin is injected, the core mold (1) of the revolving body is obliquely placed, and the included angle theta between the core mold (1) of the revolving body and the horizontal plane is 10-15 degrees.
10. The method of reducing internal defects in a composite wound article according to claim 9, wherein: when the sealing performance of the molding die is checked, after the pressure change within 5min is less than 1%, resin is injected from the glue inlet (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111227997.0A CN113665095A (en) | 2021-10-21 | 2021-10-21 | Forming die and method for reducing internal defects of composite material wound product |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111227997.0A CN113665095A (en) | 2021-10-21 | 2021-10-21 | Forming die and method for reducing internal defects of composite material wound product |
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| CN113665095A true CN113665095A (en) | 2021-11-19 |
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| CN202111227997.0A Pending CN113665095A (en) | 2021-10-21 | 2021-10-21 | Forming die and method for reducing internal defects of composite material wound product |
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| EP1112172A1 (en) * | 1998-09-11 | 2001-07-04 | Essef Corporation | Method for fabricating composite pressure vessels and products fabricated by the method |
| CN101811365A (en) * | 2009-02-20 | 2010-08-25 | 南京航空航天大学 | Forming method of 2.5-dimensional weaving revolving solid composite material |
| KR20110059414A (en) * | 2009-11-27 | 2011-06-02 | 월드테크 주식회사 | Method for manufacturing frp pressure vessel for filter membrane of water treatment |
| CN107283869A (en) * | 2017-07-31 | 2017-10-24 | 株洲时代新材料科技股份有限公司 | A kind of integral forming method of contact net support meanss |
| CN107405841A (en) * | 2015-03-09 | 2017-11-28 | 复合材料生产技术公司 | Wind object, mandrel and method for winding object |
| CN109735098A (en) * | 2018-12-27 | 2019-05-10 | 安徽旭升新材料有限公司 | Unmanned plane propeller production method can be recycled in high-performance |
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2021
- 2021-10-21 CN CN202111227997.0A patent/CN113665095A/en active Pending
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| EP1112172A1 (en) * | 1998-09-11 | 2001-07-04 | Essef Corporation | Method for fabricating composite pressure vessels and products fabricated by the method |
| CN101811365A (en) * | 2009-02-20 | 2010-08-25 | 南京航空航天大学 | Forming method of 2.5-dimensional weaving revolving solid composite material |
| KR20110059414A (en) * | 2009-11-27 | 2011-06-02 | 월드테크 주식회사 | Method for manufacturing frp pressure vessel for filter membrane of water treatment |
| CN107405841A (en) * | 2015-03-09 | 2017-11-28 | 复合材料生产技术公司 | Wind object, mandrel and method for winding object |
| CN107283869A (en) * | 2017-07-31 | 2017-10-24 | 株洲时代新材料科技股份有限公司 | A kind of integral forming method of contact net support meanss |
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