CN110667136A - Method for preparing profiling prefabricated part by needling - Google Patents
Method for preparing profiling prefabricated part by needling Download PDFInfo
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- CN110667136A CN110667136A CN201910844029.0A CN201910844029A CN110667136A CN 110667136 A CN110667136 A CN 110667136A CN 201910844029 A CN201910844029 A CN 201910844029A CN 110667136 A CN110667136 A CN 110667136A
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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
- B29C70/345—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
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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
- B29C70/06—Fibrous reinforcements only
- B29C70/10—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres
- B29C70/16—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres using fibres of substantial or continuous length
- B29C70/22—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres using fibres of substantial or continuous length oriented in at least two directions forming a two dimensional structure
- B29C70/222—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres using fibres of substantial or continuous length oriented in at least two directions forming a two dimensional structure the structure being shaped to form a three dimensional configuration
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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
- B29C70/543—Fixing the position or configuration of fibrous reinforcements before or during moulding
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Mechanical Engineering (AREA)
- Textile Engineering (AREA)
- Nonwoven Fabrics (AREA)
Abstract
The invention discloses a profiling prefabricated part needling preparation method which comprises the steps of laying a laminating unit, and sequentially wrapping at least three layers on a mould to form the laminating unit; the laminating unit comprises a fiber cloth layer, a three-dimensional fiber net cover and a net layer; needling the laminated unit to combine the short fibers of the net layer with the fiber net sleeve layer and the fiber cloth layer; repeatedly laying the laminated unit; needling at least two adjacent laminated units to combine the short fibers of the net layer of the laminated unit of the surface layer with the fiber net sleeve layer and the fiber cloth layer of the laminated unit and the previous laminated unit layer adjacent to the laminated unit and close to one side of the mould; repeating the steps of laying the laminated units and needling the two adjacent laminated units to complete interlayer combination of all the laminated units; demoulding and sewing the whole semi-finished product subjected to interlayer combination in the thickness direction to finish the preparation of the profiling prefabricated member. The problem of among the prior art hoop strength and production efficiency lower scheduling is solved, hoop strength and production efficiency are realized improving.
Description
Technical Field
The invention relates to the technical field of aerospace antenna protection, in particular to a method for manufacturing a profiling prefabricated part through needling.
Background
Due to factors such as a use environment, an antenna is usually arranged in a space surrounded by an antenna housing and an antenna cover plate in order to protect the antenna, the antenna housing and the antenna cover plate need to be made of wave-transparent materials and have certain strength, the antenna housing and the antenna cover plate are usually obtained by processing prefabricated parts, the prefabricated parts of the antenna housing and the antenna cover plate are usually formed by weaving wave-transparent fibers or sewing fiber cloth after laying, before sewing, in order to increase the bonding force between fiber cloth layers, short fibers of a mesh layer are usually brought into the fiber cloth layers by adopting a needling process to realize interlayer bonding, and the interlayer shear resistance is enhanced.
The existing needling process usually adopts three layers as a basic unit to carry out needling, the three layers comprise a fiber cloth layer, a fiber layer and a net tire layer, the whole prefabricated part is a rotating curved surface, the fiber cloth is a plane raw material, the plane fiber cloth needs to be laid on the surface of a mold, the joint part is broken, the hoop strength cannot be ensured, in order to improve the hoop strength, the fiber layer adopts continuous fibers to form on the surface of the fiber cloth layer by winding around the mold in the hoop direction, then the net tire layer is laid on the surface of the fiber layer, and finally needling penetrates through the three layers.
Although the fiber layer solves the problem of hoop strength, the process of winding the hoop fiber takes too long time and occupies more than half of the preparation period of the whole copying prefabricated member, so that the preparation efficiency of the whole copying prefabricated member is low.
Disclosure of Invention
The invention provides a method for manufacturing a profiling prefabricated part by needling, which is used for overcoming the defects of low circumferential strength, low production efficiency and the like in the prior art, improving the circumferential strength of the needling profiling prefabricated part and improving the production efficiency.
In order to achieve the aim, the invention provides a profiling prefabricated part needling preparation method, which comprises the following steps:
a lay-up and stacking unit comprising:
sequentially wrapping at least three layers on the die to form a laminating unit; the laminating unit comprises a fiber cloth layer, a three-dimensional fiber net cover and a net tire layer;
needling the laminated unit to combine the short fibers of the net layer with the fiber net sleeve layer and the fiber cloth layer;
repeatedly laying the laminated unit;
needling the adjacent two laminated units to ensure that the short fibers of the net layer of the laminated unit of the surface layer are combined with the fiber net sleeve layer, the fiber cloth layer and the previous laminated unit layer which is adjacent to the laminated unit and is close to one side of the mould;
repeating the steps of laying the laminated units and needling at least two adjacent laminated units to complete interlayer combination of all the laminated units;
demoulding and sewing the whole semi-finished product subjected to interlayer combination in the thickness direction to finish the preparation of the profiling prefabricated member.
According to the profiling prefabricated member needling preparation method provided by the invention, when the laminating unit is laid, the fiber cloth layer can be laid firstly, then the fiber net sleeve is sleeved on the outer surface of the fiber cloth layer, and finally the net tire layer is wrapped on the outer surface of the net tire layer; or a net bed layer is laid firstly, then the fiber net sleeve is sleeved on the outer surface of the net bed layer, and finally the fiber cloth is wrapped on the outer surface of the net bed layer; when the fiber cloth and the net tire are laid, the heads at the two ends are overlapped together in a crossed manner, and then when the fiber cloth and the net tire are punctured into or penetrate out of the laminating unit through needling, short fibers of the net tire layer are brought into the fiber layer and the fiber net sleeve layer through the needling on the needling, so that the interlayer combination of the laminating unit is completed; then, the laying of the laminating units is repeated, and the previous laminating unit and the current laminating unit are pierced by a needle punch to complete the combination of the two adjacent laminating units; repeating the laying of the laminated units and the needling combination of at least two adjacent laminated units; until the needling of all the laminated units is completed; finally, demolding the semi-finished product of the prefabricated part subjected to needling, and then finishing the preparation of the square prefabricated part by penetrating and sewing; the fiber net cover is of a three-dimensional structure, on one hand, the hoop strength can be enhanced, the separation of the head parts at two ends of the fiber layer or the net tire layer wrapped by the inner layer can be prevented, and the fiber net cover can be formed by weaving through a machine, so that the production efficiency of the three-dimensional prefabricated member is greatly improved compared with a unidirectional fiber winding process.
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, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic representation of a contoured preform during processing provided by an embodiment of the present invention;
FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;
FIG. 3 is an enlarged partial view of section I of FIG. 2 of a contoured preform provided in accordance with a first preferred embodiment of the present invention;
FIG. 4 is an enlarged schematic partial view of a contoured preform I in FIG. 2 provided in accordance with a second preferred embodiment of the present invention;
FIG. 5 is a schematic representation of the fiber weave of the fibrous web in a contoured preform needling process provided by embodiments of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are only for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; the connection can be mechanical connection, electrical connection, physical connection or wireless communication connection; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In addition, the technical solutions in the embodiments of the present invention may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination of technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
Example one
As shown in the attached figures 1-4, the method for preparing the profiling prefabricated part by needling comprises the following steps:
s1, laying down a laminated unit comprising:
sequentially wrapping at least three layers on the die to form a laminating unit; the laminated unit comprises a fiber cloth layer 4, a three-dimensional fiber net cover 5 and a net layer 6;
when the stacking unit is laid, a fiber cloth layer 4 can be laid on the mold 1, then the fiber net cover 5 is sleeved on the outer surface of the fiber cloth layer 4, and finally the net tire layer 6 is wrapped on the outer surface of the fiber net cover 5; or a net-shaped bed course 6 can be paved, then the three-dimensional fiber net cover 5 is sleeved on the outer surface of the net-shaped bed course 6, and finally the fiber cloth layer 4 is wrapped on the outer surface of the net-shaped bed course 6; when laying the fiber cloth and the net tire, the heads at the two ends are overlapped together in a crossing way; completing the laying of the first lamination unit 31;
s2, needling the first laminating unit 31 to combine the short fibers 7 of the net layer with the three-dimensional fiber net cover 5 layer and the fiber cloth layer 4 layer; when the fiber is pierced into or out of the laminating unit, the end fiber of the net layer 6 is brought into the fiber layer 4 and the three-dimensional fiber net jacket layer 5 by the piercing on the piercing, and the interlayer combination of the first laminating unit 31 is completed;
s3, repeatedly laying the laminated units; completing the laying of the second stacking unit 32; the layer laying sequence of the first laminating unit 31 and the second laminating unit 32 is the same, so that the needling of the second laminating unit 32 is completed;
s4, needling at least two adjacent lamination units (including the first lamination unit 31 and the second lamination unit 32) to bond the short fibers 7 of the web layer 6 of the second lamination unit 32 of the surface layer with the three-dimensional fiber net 5, the fiber cloth layer 4 and the first lamination unit 31 adjacent to the second lamination unit 32 and on the side close to the mold 1;
s5, repeating the steps of laying the laminated units and needling the two adjacent laminated units to complete interlayer combination of all the laminated units; the interlayer bonding of the first lamination unit 31 and the second lamination unit 32, the bonding of the second lamination unit 32 and the third lamination unit, the bonding of the third lamination unit and the fourth lamination unit … … are performed until the bonding of all the lamination units is completed. In practice, the needling stroke may be equivalent to the thickness of the finished product, and each time all the laid lamination units are needled, for example, 15 lamination units are preset to be the total thickness of the blank, the needling stroke may be set to be slightly more than the thickness of 15 lamination units, and the 15 lamination units are needled until the 15 th lamination unit is laid, so that the short fibers of the outermost layer of the net can be bonded to the adjacent lamination units in the finished thickness to the maximum extent.
And S6, demolding, and sewing the whole semi-finished product subjected to interlayer combination in the thickness direction to finish the preparation of the profiling prefabricated member 2.
Then, the laying of the laminating units is repeated, and the previous laminating unit and the current laminating unit are pierced by a needle punch to complete the combination of the two adjacent laminating units; repeating the laying of the laminated units and the needling combination of the two adjacent laminated units; until the needling of all the laminated units is completed; finally, demolding the semi-finished product of the prefabricated part subjected to needling, and then finishing the preparation of the square prefabricated part by penetrating and sewing; the fiber net cover is of a three-dimensional structure, wherein the three-dimensional structure is a three-dimensional structure presented under a rigid support, and is of a collapse shape or a folding shape due to the self factor of a flexible weaving material when the support is lost, for example, a cap woven by wool is hemispherical when being worn on the head and can be randomly folded when being taken off, but a weaving surface formed after weaving is a three-dimensional continuous surface; on the one hand, the hoop strength can be enhanced, the separation of the head parts at the two ends of the fiber layer or the net tire layer wrapped by the inner layer can be prevented, and the fiber net sleeve can be formed by weaving through a machine, so that the production efficiency of the three-dimensional prefabricated member is greatly improved compared with the process of unidirectional fiber winding. The radome prefabricated member or the spray pipe prefabricated member can be prepared by the needling method, the fiber of the radome prefabricated member usually adopts silicon dioxide or alumina fiber, and the fiber of the spray pipe prefabricated member usually adopts silicon carbide and carbon fiber.
Preferably, referring to fig. 3, as a first preferred embodiment of the step S1 of laying up the stacked units, the method includes:
S11A, wrapping at least one layer of fiber cloth 4 on the die 1;
S12A, sleeving at least one layer of three-dimensional fiber net sleeve 5 on the surface of the fiber cloth;
S13A, wrapping at least one net layer 6 on the surface of the fiber net sleeve to form a first laminating unit 31;
S14A, the short fibers 7 on the net tire are driven to be combined with the three-dimensional fiber net cover and the fiber layer of the laminating unit in the process of moving towards the direction close to the mold through a plurality of barbs arranged on the peripheral side of the needle body.
The pricker can be arranged into a regular prism shape or a pyramid shape, preferably a triangular pyramid, each edge is provided with a barb, the shape of each barb inclines outwards, an included angle between each barb and the tip part of the triangular pyramid forms an acute angle, and in the process of pricking from outside to inside, short fibers of the net layer are clamped and brought into the fiber layer and the fiber net sleeve layer inwards through a crotch shape formed between each barb and the tip part of the triangular pyramid. In order to improve the needling effect, the barb positions on different edges can be staggered, and the probability that the short fibers of the net layer are scraped by the barbs is improved due to the reduction of the punching size during needling.
Preferably, referring to fig. 4, as a second preferred embodiment of the step S1 of laying up the stacked units, the method includes:
S11B, wrapping at least one net tire layer 6 on the mold;
S12B, sleeving at least one layer of three-dimensional fiber net sleeve 5 on the surface of the fiber cloth;
S13B, wrapping at least one layer of fiber cloth 4 on the surface of the fiber net sleeve to form a first laminating unit 31;
S14B, the short fibers 7 on the net are driven to combine with the three-dimensional fiber net cover and the fiber layer of the laminated unit in the process of moving away from the die by a plurality of positive stabs arranged on the peripheral side of the needle body.
The pricker can be arranged into a regular prism shape or a pyramid shape, preferably a triangular pyramid, each edge is provided with a regular prick, the shape of the regular prick is outwards inclined, an included angle between the regular prick and the part of the triangular pyramid opposite to the tip end is an acute angle, and in the process of penetrating from inside to outside of the needle prick, the short fibers of the net layer are clamped and outwards brought into the fiber layer and the fiber net sleeve layer through a crotch shape formed between the regular prick and the triangular pyramid far away from the tip end part. In order to improve the needling effect, the positive needling positions on different edges can be staggered, and the perforation size during needling is reduced so as to improve the probability that short fibers of the net layer are scraped by barbs. In contrast to the first preferred embodiment described above, which carried the staple fibers into the other layers when they were disengaged from the laminating unit during the return process, the staple fibers would not be carried out of the laminating unit and the bonding quality between the layers would not be affected, whereas in the first embodiment, it is possible to carry the staple fibers out of the fibrous layers and the fibrous web sheath when they were disengaged from the laminating unit during the return process of the needles.
Preferably, the angle between the positive spike and the portion of the lancet body distal from the lancing end is an acute angle, the acute angle being between 14.5 and 25.8 °. The shape of just stinging is the arc, and stings the end and inwards bends or contract to the opening and outwards establish at the edge part, reduces the external diameter size on the one hand, reduces the surface of a wound to each layer of laying when stinging, and on the other hand is also being convenient for insert the short-staple, is favorable to improving acupuncture efficiency.
The mould can be made of elastic materials such as rubber or silica gel and the like so as to prevent the mould from deforming under stress caused by rigid materials in the process of needle puncture.
In the above embodiment, before the preparing the laminated unit, the step S0 of forming the fiber net cover by one-time weaving is further included. The existing faucet jacquard machine and the shuttle loom can be combined to realize one-time weaving, and the silicon dioxide fiber or the silicon carbide fiber is woven to form the fiber mesh sleeve. The two-step method is to form a planar knitting sheet by two-dimensional knitting, then sew and form the edge of the planar knitting sheet to make a fiber mesh, and certainly, in order to obtain higher annular fiber strength, a three-dimensional knitting can be adopted to form a three-dimensional mesh, but the knitting efficiency is relatively low.
Preferably, referring to fig. 5, the step S0 of weaving in the one-time method includes:
s01, arranging a plurality of warp fibers 51 in the axial (generatrix) dimension of the fiber mesh (see conical shape in fig. 5);
s02, weft fibers 52 are sequentially threaded through all of the warp fibers and continuously woven in a spiral pattern until weft fibers 52 complete the weave at predetermined locations on warp fibers 51 to form three-dimensional fiber mesh sleeve 5. The continuous winding in a spiral shape here means: the weaving of latitudinal direction fibre and all radial fibre is around establishing the direction, can be from the ascending spiral of cone bottom, also can be from the descending spiral of cone top down, does not all influence the continuous weaving of latitudinal direction fibre, and this scheme is continuous form for the fibre of current two-step method weaving technology on the latitudinal direction, does not have the joint, reduces the concatenation technology step on the one hand, and on the other hand bulk strength performance is higher, and weaves efficiency relatively higher.
Preferably, the weft fibers sequentially pass through all the warp fibers and are woven back and forth, and the step S02 of finishing the weaving of the weft fibers at the predetermined positions of the warp fibers includes:
s021, numbering the warp fibers according to the arrangement sequence in the same direction; the length may be in accordance with the axial dimension of the fibrous web;
s022, the odd-numbered warp fibers and the even-numbered warp fibers alternately act in opposite directions to form gaps for weft fibers to continuously pass through and weave with the warp fibers. The order and timing of the actions of the odd-numbered warp fibers and the even-numbered warp fibers can be achieved by programming, thereby achieving the time and location of the weft fiber crossing.
Preferably, the step S022 of alternately acting the odd-numbered warp fibers and the even-numbered warp fibers in opposite directions to form gaps for weft fibers to continuously pass through and weave with the warp fibers includes:
s0221, making odd-numbered warp fibers and even-numbered warp fibers act in opposite directions to form first gaps; for example, odd-numbered warp fibers all move up by the same displacement, even-numbered warp fibers all move down by the same displacement;
s0222, the weft fibers pass through the gaps in a positive direction (e.g., clockwise); returning after winding all the radial fibers for a circle; for example: returning to the 1 st radial fiber;
s0223, exchanging the action directions of the odd-numbered warp fibers and the even-numbered warp fibers and then forming second gaps again; for example, odd-numbered warp fibers all move downward by the same displacement, and even-numbered warp fibers all move upward by the same displacement;
s0224, the weft fiber passes through the clearance in the positive direction (for example, clockwise); returning after winding all the radial fibers for a circle; returning to the 1 st radial fiber;
and S0225, repeating the above steps to finish weaving.
With toper three-dimensional fiber net cover, the above-mentioned fiber net cover of weaving formation, warp direction fibre include a plurality of parallel arrangement's single fibre, and latitudinal direction fibre is that a continuous fiber weaves in succession between many warp direction fibre and forms double-deck and peripheral continuous three-dimensional fiber net cover, and fiber net cover seam need not the seam closing, and annular latitudinal direction fibre all is continuous form, has improved the hoop intensity of three-dimensional prefab far away to keep production efficiency colleges and universities.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (8)
1. A profiling prefabricated part needling preparation method is characterized by comprising the following steps:
a lay-up and stacking unit comprising:
sequentially wrapping at least three layers on the die to form a laminating unit; the laminating unit comprises a fiber cloth layer, a three-dimensional fiber net cover and a net tire layer;
needling the laminated unit to combine the short fibers of the net layer with the fiber net sleeve layer and the fiber cloth layer;
repeatedly laying the laminated unit;
needling the adjacent two laminated units to ensure that the short fibers of the net layer of the laminated unit of the surface layer are combined with the fiber net sleeve layer, the fiber cloth layer and the previous laminated unit layer which is adjacent to the laminated unit and is close to one side of the mould;
repeating the steps of laying the laminated units and needling at least two adjacent laminated units to complete interlayer combination of all the laminated units;
demoulding and sewing the whole semi-finished product subjected to interlayer combination in the thickness direction to finish the preparation of the profiling prefabricated member.
2. The contoured preform needling preparation method according to claim 1, wherein the step of laying up a lamination unit comprises:
wrapping at least one layer of fiber cloth on the mould;
sleeving at least one layer of three-dimensional fiber net sleeve on the surface of the fiber cloth;
wrapping at least one net layer on the surface of the fiber net sleeve to form a laminating unit;
the short fibers on the net tire are driven to be combined with the three-dimensional fiber net cover and the fiber layer of the laminating unit in the process of running towards the direction close to the mold through the plurality of barbs arranged on the peripheral side of the pricking needle main body.
3. The contoured preform needling preparation method according to claim 1, wherein the step of laying up a lamination unit comprises:
wrapping at least one net layer on the mould;
sleeving at least one layer of three-dimensional fiber net sleeve on the surface of the fiber cloth;
wrapping at least one layer of fiber cloth on the surface of the fiber net sleeve to form a laminating unit;
the short fibers on the net tire are driven to be combined with the three-dimensional fiber net cover and the fiber layer of the laminating unit in the process of moving in the direction away from the mold through a plurality of positive thorns arranged on the peripheral side of the felting needle main body.
4. A method of producing a square preform by needling as claimed in claim 3, wherein the angle between the positive and part of the body of the needles remote from the piercing end is acute, said acute angle being between 14.5 ° and 25.8 °.
5. A method of producing a profiled preform according to claim 2, 3 or 4 further comprising the step of forming a fibrous web by a single knit before said producing a laminated unit.
6. The method for producing a contoured preform according to claim 5, wherein said knitting comprises the specific steps of:
arranging a plurality of warp fibers according to the axial size of the fiber mesh sleeve;
the weft fibers sequentially penetrate through all the warp fibers and are continuously woven in a spiral shape, and the weft fibers are woven at the preset positions of the warp fibers to form the fiber mesh sleeve.
7. The method of profiling preform needling preparation of claim 6, wherein the weft fibers are sequentially threaded through all the warp fibers and continuously woven in a spiral pattern, the step of completing the weaving of the weft fibers at predetermined positions of the warp fibers comprising:
the warp fibers are numbered according to the same direction arrangement sequence;
the odd-numbered warp fibers and the even-numbered warp fibers alternately act in opposite directions to form gaps for weft fibers to pass through and weave with the warp fibers.
8. The method of profiling preform needling preparation of claim 7, wherein the step of alternating the odd numbered warp fibers and the even numbered warp fibers in opposite directions to form gaps for weft fibers to pass back and forth through to weave with the warp fibers comprises:
the odd-numbered warp fibers and the even-numbered warp fibers act in opposite directions to form gaps;
the weft-wise fibers pass through the gaps according to a preset direction and return after being wound for a circle;
the odd-numbered warp fibers and the even-numbered warp fibers exchange action directions and then act to form gaps again;
the weft-wise fibers pass through the gaps in the same direction as the previous direction, and return after being wound for a circle;
and repeating the above actions to complete the knitting.
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| CN201910844029.0A CN110667136A (en) | 2019-09-06 | 2019-09-06 | Method for preparing profiling prefabricated part by needling |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114643725A (en) * | 2020-12-21 | 2022-06-21 | 中国航发商用航空发动机有限责任公司 | Manufacturing method of composite casing and composite casing |
| CN115262095A (en) * | 2022-06-30 | 2022-11-01 | 南京玻璃纤维研究设计院有限公司 | Forming device and method for net tire sleeve |
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| CN117265641A (en) * | 2023-11-20 | 2023-12-22 | 内蒙古鼎泰万邦新材料有限公司 | Braided crucible preform and manufacturing method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114643725A (en) * | 2020-12-21 | 2022-06-21 | 中国航发商用航空发动机有限责任公司 | Manufacturing method of composite casing and composite casing |
| CN114643725B (en) * | 2020-12-21 | 2024-04-26 | 中国航发商用航空发动机有限责任公司 | Manufacturing method of composite casing and composite casing |
| CN115262095A (en) * | 2022-06-30 | 2022-11-01 | 南京玻璃纤维研究设计院有限公司 | Forming device and method for net tire sleeve |
| CN115447216A (en) * | 2022-08-31 | 2022-12-09 | 南京玻璃纤维研究设计院有限公司 | Quasi-conical prefabricated body and preparation method thereof |
| CN115447216B (en) * | 2022-08-31 | 2023-11-07 | 南京玻璃纤维研究设计院有限公司 | Conical-like preform and preparation method thereof |
| CN117265641A (en) * | 2023-11-20 | 2023-12-22 | 内蒙古鼎泰万邦新材料有限公司 | Braided crucible preform and manufacturing method |
| CN117265641B (en) * | 2023-11-20 | 2024-01-30 | 内蒙古鼎泰万邦新材料有限公司 | Braided crucible preform and manufacturing method |
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