CN104818567B - A kind of 2.5D braiding structure synchronizes incorgruous stereo fabric and preparation method thereof - Google Patents

Abstract

The invention discloses a kind of 2.5D braiding structure and synchronize incorgruous stereo fabric and preparation method thereof, 2.5D braiding structure synchronizes incorgruous stereo fabric, column fabric including the bottom belt flanging bound or do not bind, flanging includes: straight flange and oblique flange, straight flange refers to that the flange vertical with column fabric side, oblique flange refer to and column fabric side off plumb flange；Preparation method is for weave with core for inner core, and adopts the 2.5D curved binding of shallow friendship to knit cellular construction.2.5D braiding structure of the present invention synchronizes the preparation method of incorgruous stereo fabric can realize the shape global formation compared with complex textile；Prepared fabric unit structural integrity, fiber seriality are good；In fabric forming process, to have design strong for full unit structure；2.5D braiding structure fiber intertwined point each other is many, and the degree of freedom of cellular construction change is little, and technological parameter is controlled, and structural homogeneity is good；Gained fabric construction is tight, good integrity, good mechanical performance.

Description

A kind of 2.5D braiding structure synchronizes incorgruous stereo fabric and preparation method thereof

Technical field

The present invention relates to a kind of 2.5D braiding structure and synchronize incorgruous stereo fabric and preparation method thereof, belong to stereo fabric field.

Background technology

2.5D fabric is on the basis of woven three-dimensional woven equipment, many monofilaments are utilized to make warp fiber form multilamellar opening, the class layer stereo fabric formed after introducing weft fiber in certain sequence, but the 3-d braided fiber intertwined point each other of 2.5D fabric is less at present, the degree of freedom of cellular construction change is greatly, structural manufacturing process parameter designing is many by cellular construction change influence factor, technological parameter is uncontrollable, structural homogeneity is poor, in order to better meet the demand of aerospace field, it is badly in need of a kind of 2.5D new product of exploitation.There is no the relevant report synchronizing incorgruous stereo fabric about 2.5D braiding structure at present.

Summary of the invention

For the defect such as overcome in prior art that the 3-d braided fiber of 2.5D fabric intertwined point each other is less, technological parameter is uncontrollable and structural homogeneity is poor, the present invention provides a kind of 2.5D braiding structure to synchronize incorgruous stereo fabric and preparation method thereof.

For solving above-mentioned technical problem, the technical solution adopted in the present invention is as follows:

A kind of 2.5D braiding structure synchronizes incorgruous stereo fabric, including the column fabric of the bottom belt flanging bound or do not bind, wherein, flanging includes: straight flange and oblique flange, straight flange refers to that the flange vertical with column fabric side, oblique flange refer to and column fabric side off plumb flange.

Above-mentioned 2.5D braiding structure synchronizes incorgruous stereo fabric and includes flanging and side and/or top, specifically has the advantages such as tight, the excellent in mechanical performance of good integrity, even structure, can meet the demand of aerospace field better.

2.5D braiding structure synchronizes incorgruous stereo fabric and includes warp fiber system and weft fiber system, and warp fiber system is interweaved into Angular interlocking structure with weft fiber system.Which increase that 3-d braided fiber intertwined point each other, technological parameter be controlled and even structure.

The preparation method that above-mentioned 2.5D braiding structure synchronizes incorgruous stereo fabric, 2.5D braiding structure synchronizes the braiding of incorgruous stereo fabric and weaves for inner core with core, and adopts the 2.5D curved binding of shallow friendship to knit cellular construction.

The application said method can realize the global formation of complex-shaped fabric；Prepared fabric unit structural integrity, fiber seriality are good；In fabric forming process, to have design strong for full unit structure；Fiber intertwined point each other is many, and the degree of freedom of cellular construction change is little, and structural manufacturing process parameter designing is little by cellular construction change influence factor, and technological parameter is controlled, and structural homogeneity is good；The composite obtained by the application stereo fabric is utilized to have the features such as close structure, good integrity, good mechanical performance.

In order to improve the close structure of fabric, good integrity and mechanical property further, if binding, top adopts paving yarn, inlaid thread method to complete the paving top braiding at top, and side and flanging adopt and synchronize the braiding of incorgruous forming method；If not binding, adopting directly extension warp fiber to be re-introduced into the side of weft fiber braiding column fabric, then employing synchronizes incorgruous forming method braiding flanging.

If binding, after paving top braiding is completed, it is sequentially carried out following steps: a, end face downwardly turned over 90 degree through weft fiber, drawing the warp fiber of the side fabric perpendicular with end face, carry out synchronous forming, weaving direction change, interweave formation side fabric by warp fiber and weft fiber；B, the warp fiber of side fabric outwards being overturn 0-90 degree, as the warp fiber of flanging, carry out synchronous forming, weaving direction changes, interweave formation flanging by warp fiber and weft fiber；If not binding, adopting directly extension warp fiber to be re-introduced into weft fiber and having woven the side of column fabric, again the warp fiber of side fabric is outwards overturn 0-90 degree, warp fiber as flanging, carry out synchronous forming, weaving direction changes, and interweave formation flanging by warp fiber and weft fiber.

Above-mentioned can according to the change of flanging size, design multiple spot add warp fiber technology, it is achieved the braiding of flanging.

In order to improve the adaptability of gained fabric, it is cylindric that 2.5D braiding structure synchronizes the side of incorgruous stereo fabric, flanging is straight flange, being shaped as of straight flange is round, straight flange adds warp fiber quantity and is calculated according to outer perimeter difference and warp fiber density in circumference, often weaving two latitudes to need to add a warp fiber, straight flange adds warp fiber quantity formula and is:

M=(C₁-C₂)×P_j(1)

In formula: m is for adding warp fiber quantity；C1 is excircle girth, C2 is inner periphery girth；P_jFor warp fiber density.

Another kind of technical scheme as the application, it is cylindric that 2.5D braiding structure synchronizes the side of incorgruous stereo fabric, flanging is oblique flange, oblique flange be shaped as ellipse, oblique flange adds warp fiber quantity and is calculated according to outer perimeter difference in ellipse and warp fiber density, often weaving two latitudes to need to add a warp fiber, oval perimeters formula is:

$P=2\mathrm{\πa}(1-\frac{1}{2^2}{e}^2-\frac{1^2\·3}{2^2\·4^2}{e}^4-b_{n-1}\×\frac{2n-1}{{\left(2n\right)}^2}\×e^{2n}...)$

If $b_1=\frac{1}{2^2},$ General term formula is: $b_n=b_{n-1}\×\frac{2n-1}{{\left(2n\right)}^2}---\left(2\right)$

In formula:P is oval perimeters, and a and b is oval major semiaxis and semi-minor axis respectively, and e is eccentricity, and n is the natural number of >=2；

Oblique flange adds warp fiber quantity formula:

M=(P₁-P₂)×P_j(3)

In formula: m is for adding warp fiber quantity；P₁For outer oval perimeters, P₂For interior oval perimeters；P_jFor warp fiber density.

For the ease of preparation, improve compactness and the uniformity of gained flanging simultaneously, flanging is bisected into the sector of 12 deciles, carries out adding warp fiber.

The NM technology of the present invention is all with reference to prior art.

Compared with prior art, the advantage of the preparation method that 2.5D braiding structure of the present invention synchronizes incorgruous stereo fabric is in that: can realize the shape global formation compared with complex textile, meet the mechanical property of complicated abnormal shape component；Prepared fabric unit structural integrity, fiber seriality is good, parameter is controlled, steady quality, adding yarn point without hole, fabric corner fiber keeps seriality, and corner is without broken yarn, fabric face breaks end without fiber, it is achieved that complex component fabric single cell structure complete yams is continuous；In fabric forming process, to have design strong for full unit structure；2.5D braiding structure fiber intertwined point each other of the present invention is many, and the degree of freedom of cellular construction change is little, and structural manufacturing process parameter designing is little by cellular construction change influence factor, and technological parameter is controlled, and structural homogeneity is good；2.5D braiding structure synchronizes incorgruous stereo fabric good integrity, and fiber is evenly distributed, and by the composite materials property of its making and excellent electrical property, can be widely used in aerospace field；Gained composite has the features such as close structure, good integrity, good mechanical performance.

Accompanying drawing explanation

Fig. 1 is the structural representation of embodiment 1 gained fabric.

Fig. 2 is the structural representation of embodiment 2 gained fabric.

Fig. 3 is the structural representation of embodiment 3 gained fabric.

Fig. 4 is that embodiment 3 adds warp fiber schematic diagram, and in figure, 1-12 represents 12 zoness of different.

In figure, the direction of arrow is weaving direction, and 13 is top, and 14 is side, and 15 is flanging.

Detailed description of the invention

In order to be more fully understood that the present invention, it is further elucidated with present disclosure below in conjunction with embodiment, but present disclosure is not limited solely to the following examples.

Embodiment 1:

2.5D braiding structure synchronizes incorgruous stereo fabric, and including binding and the column fabric of bottom belt flanging, wherein, flanging is straight flange.

Warp fiber is T3003K fiber × 1 strand, weft yarn is T3003K fiber × 1 strand, fabric end count is 10 pieces/centimetre, and filling density is 3.5 pieces/centimetre, and the warp thread number of plies is designed as 10 layers, and (fabric is all the same with the warp thread number of plies to flange end count, filling density from top to side, other embodiments is too), the end face of fabric is square face, side be four directions cylinder, flanging be four directions cylinder each side extend square, fabric form is as it is shown in figure 1, concrete preparation method is as follows:

(1) described braiding structure synchronizes the employing 2.5D curved binding of shallow friendship of incorgruous stereo fabric and knits cellular construction, and its structure includes warp fiber system and weft fiber system, and warp fiber system is interweaved into Angular interlocking structure with weft fiber system；

(2) braiding of fabric weaves with core for inner core；

(3) paving yarn, inlaid thread technology is adopted to complete the paving top braiding of center top, in Fig. 1 shown in a of direction；

(4), after completing the paving top braiding of center top, the incorgruous forming technique of synchronization is adopted to carry out the braiding of stereo fabric side and flange；

(5) feature according to component, what paving was pushed up the expansible fabric of plane downwardly turns over 90 degree through weft fiber, in Fig. 1 shown in the b of direction, draw the warp fiber of the side fabric perpendicular with end face, carry out synchronous forming, weaving direction changes, and interweave formation side fabric by warp fiber and weft fiber；

(6) after side has woven, continue to turn 90 degrees turned-out for the warp fiber of side fabric, in Fig. 1 shown in the c of direction, warp fiber as flanging, carry out synchronous forming, weaving direction changes, realizing side to weave to the conversion of perpendicular corners flanging, interweave formation flanging by warp fiber and weft fiber；

(7), after completing the braiding of step (6), namely complete 2.5D braiding structure of the present invention and synchronize the braiding of incorgruous stereo fabric.

Embodiment 2:

2.5D braiding structure synchronizes incorgruous stereo fabric, and including not binding and the cylindric fabric of bottom belt flanging, wherein, flanging is straight flange (annular).

Warp fiber is T3003K fiber × 1 strand, weft yarn is T3003K fiber × 1 strand, straight flange internal diameter is 40mm, straight flange external diameter is 80mm, and the warp thread number of plies is designed as 10 layers, and fabric end count is 10 pieces/centimetre, filling density is 3.5 pieces/centimetre, fabric flange is straight flange (circle), and fabric form is as in figure 2 it is shown, concrete preparation method is as follows:

(1) described braiding structure synchronizes the employing 2.5D curved binding of shallow friendship of incorgruous stereo fabric and knits cellular construction, and its structure includes warp fiber system and weft fiber system, and warp fiber system is interweaved into Angular interlocking structure with weft fiber system；

(2) braiding of fabric weaves with core for inner core；

(3) adopt directly extension warp fiber to be re-introduced into broadwise (hoop) fiber and complete cylindric braiding, in Fig. 2 shown in the d of direction；

(4) after completing cylindric braiding, the incorgruous forming technique of synchronization is adopted to carry out the braiding of the straight flange of fabric, feature according to component, it turn 90 degrees turned-out for the warp fiber of column fabric, in Fig. 2 shown in the e of direction, as the warp fiber of flanging, carrying out synchronous forming, weaving direction change, interweave formation flanging by warp fiber and weft fiber；Straight flange is bisected into the sector of 12 deciles, carry out adding warp fiber, straight flange adds warp fiber quantity and is calculated according to outer perimeter difference and warp fiber density in circumference, and often weaving two latitudes needs to add a warp fiber, and straight flange adds warp fiber quantity formula and is:

M=(C₁-C₂)×P_j(1)

In formula: m is for adding warp fiber quantity；C1 is excircle girth, C2 is inner periphery girth；P_jFor warp fiber density；

(5), after completing the braiding of step (4), namely complete 2.5D braiding structure of the present invention and synchronize the braiding of incorgruous stereo fabric.

Embodiment 3:

2.5D braiding structure synchronizes incorgruous stereo fabric, and including the column fabric of the bottom belt flanging not bound, wherein, flanging is oblique flange (oval ring).

Warp fiber is T3003K fiber × 1 strand, weft yarn is T3003K fiber × 1 strand, oblique flange internal diameter is 40mm, oblique flange external diameter is 80mm, and the warp thread number of plies is designed as 10 layers, and fabric end count is 10 pieces/centimetre, filling density is 3.5 pieces/centimetre, fabric flange is oblique flange (ellipse), and fabric form is as it is shown on figure 3, concrete preparation method is as follows:

(1) described braiding structure synchronizes the employing 2.5D curved binding of shallow friendship of incorgruous stereo fabric and knits cellular construction, and its structure includes warp fiber system and weft fiber system, and warp fiber system is interweaved into Angular interlocking structure with weft fiber system；

(2) braiding of fabric weaves with core for inner core；

(3) adopt directly extension warp fiber to be re-introduced into broadwise (hoop) fiber and complete cylindric braiding, in Fig. 3 shown in the f of direction；

(4) after completing cylindric braiding, the incorgruous forming technique of synchronization is adopted to carry out the braiding of the oblique flange of fabric, feature according to component, the warp fiber of column fabric is overturn θ degree, in Fig. 3 shown in the g of direction, as the warp fiber of flanging, carrying out synchronous forming, weaving direction change, interweave formation flanging by warp fiber and weft fiber；Oblique flange being bisected into the sector of 12 deciles, carries out adding warp fiber, oblique flange adds warp fiber quantity and is calculated according to outer perimeter difference in ellipse and warp fiber density, and often weaving two latitudes needs to add a warp fiber, and oval perimeters formula is:

$P=2\mathrm{\πa}(1-\frac{1}{2^2}{e}^2-\frac{1^2\·3}{2^2\·4^2}{e}^4-b_{n-1}\×\frac{2n-1}{{\left(2n\right)}^2}\×e^{2n}...)$

If $b_1=\frac{1}{2^2},$ General term formula is: $b_n=b_{n-1}\×\frac{2n-1}{{\left(2n\right)}^2}---\left(2\right)$

In formula:P is oval perimeters, and a and b is oval major semiaxis and semi-minor axis respectively, and e is eccentricity, and n is the natural number of >=2；

Oblique flange adds warp fiber quantity formula:

M=(P₁-P₂)×P_j(3)

In formula: m is for adding warp fiber quantity；P₁For outer oval perimeters, P₂For interior oval perimeters；P_jFor warp fiber density；

(5), after completing the braiding of step (4), namely complete 2.5D braiding structure of the present invention and synchronize the braiding of incorgruous stereo fabric.

Fabric unit structural integrity prepared by the various embodiments described above, fiber seriality is good, parameter is controlled, steady quality, adding yarn point without hole, fabric corner fiber keeps seriality, and corner is without broken yarn, fabric face breaks end without fiber, it is achieved that complex component fabric single cell structure complete yams is continuous；In fabric forming process, to have design strong for full unit structure；2.5D braiding structure fiber intertwined point each other is many, and the degree of freedom of cellular construction change is little, and structural manufacturing process parameter designing is little by cellular construction change influence factor, and technological parameter is controlled, and structural homogeneity is good；2.5D braiding structure synchronizes incorgruous stereo fabric good integrity, and fiber is evenly distributed, by the composite materials property of its making and excellent electrical property.

The test data that the test of the fabric mechanics in the various embodiments described above is the plate with same process parameter the mechanical property that adopts resin transfer molding (RTM) process method (RTM) to carry out composite molding embody.The structural parameters of plate are as follows:

Fabric size specification: 430mm × 120mm × 3mm

Warp count: 10/cm；Weft count: 3.5/cm；The warp thread number of plies: 10 layers；Weft layers: 10 layers

Warp thread specification: T-3003K sub-thread；Weft yarn specification: T-3003K sub-thread

The mechanical property of plate is as shown in Table 1-2:

Table 1 bending property

Table 2 tensile property

Claims (6)

1. the preparation method that a 2.5D braiding structure synchronizes incorgruous stereo fabric, it is characterised in that: 2.5D braiding structure synchronizes incorgruous stereo fabric and includes the column fabric of the bottom belt flanging binding or not binding；

2.5D braiding structure synchronizes the braiding of incorgruous stereo fabric and weaves for inner core with core, and adopts the 2.5D curved binding of shallow friendship to knit cellular construction；

It is cylindric that 2.5D braiding structure synchronizes the side of incorgruous stereo fabric, flanging is straight flange, being shaped as of straight flange is round, straight flange adds warp fiber quantity and is calculated according to outer perimeter difference and warp fiber density in circumference, often weaving two latitudes to need to add a warp fiber, straight flange adds warp fiber quantity formula and is:

M=(C₁-C₂)×P_j(1)

In formula: m is for adding warp fiber quantity；C1 is excircle girth, C2 is inner periphery girth；P_jFor warp fiber density.

2. preparation method as claimed in claim 1, it is characterised in that: 2.5D braiding structure synchronizes incorgruous stereo fabric and includes warp fiber system and weft fiber system, and warp fiber system is interweaved into Angular interlocking structure with weft fiber system.

3. preparation method as claimed in claim 1 or 2, it is characterised in that: if binding, top adopts paving yarn, inlaid thread method to complete the paving top braiding at top, and side and flanging adopt and synchronize the braiding of incorgruous forming method；If not binding, adopting directly extension warp fiber to be re-introduced into the side of weft fiber braiding column fabric, then employing synchronizes incorgruous forming method braiding flanging.

4. preparation method as claimed in claim 3, it is characterized in that: if binding, after paving top braiding is completed, it is sequentially carried out following steps: a, end face downwardly turned over 90 degree through weft fiber, draw the warp fiber of the side fabric perpendicular with end face, carry out synchronous forming, weaving direction changes, and interweave formation side fabric by warp fiber and weft fiber；B, the warp fiber of side fabric outwards being overturn 0-90 degree, as the warp fiber of flanging, carry out synchronous forming, weaving direction changes, interweave formation flanging by warp fiber and weft fiber；If not binding, adopting directly extension warp fiber to be re-introduced into weft fiber and having woven the side of column fabric, again the warp fiber of side fabric is outwards overturn 0-90 degree, warp fiber as flanging, carry out synchronous forming, weaving direction changes, and interweave formation flanging by warp fiber and weft fiber.

5. preparation method as claimed in claim 1 or 2, it is characterized in that: it is cylindric that 2.5D braiding structure synchronizes the side of incorgruous stereo fabric, flanging is oblique flange, oblique flange be shaped as ellipse, oblique flange adds warp fiber quantity and is calculated according to outer perimeter difference in ellipse and warp fiber density, often weaving two latitudes to need to add a warp fiber, oval perimeters formula is:

$P=2\mathrm{\π}a(1-\frac{1}{2^2}{e}^2-\frac{1^2\·3}{2^2\·4^2}{e}^4-b_{n-1}\×\frac{2n-1}{{\left(2n\right)}^2}\×e^{2n}...)$

If $b_1=\frac{1}{2^2},$ General term formula is: $b_n=b_{n-1}\×\frac{2n-1}{{\left(2n\right)}^2}---\left(2\right)$

In formula:P is oval perimeters, and a and b is oval major semiaxis and semi-minor axis respectively, and e is eccentricity, and n is the natural number of >=2；

Oblique flange adds warp fiber quantity formula:

M=(P₁-P₂)×P_j(3)

In formula: m is for adding warp fiber quantity；P₁For outer oval perimeters, P₂For interior oval perimeters；P_jFor warp fiber density.

6. preparation method as claimed in claim 1 or 2, it is characterised in that: flanging is bisected into the sector of 12 deciles, carries out adding warp fiber.