CN112941716A - Weaving forming method of semi-closed type conical prefabricated body - Google Patents
Weaving forming method of semi-closed type conical prefabricated body Download PDFInfo
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- CN112941716A CN112941716A CN202110118512.8A CN202110118512A CN112941716A CN 112941716 A CN112941716 A CN 112941716A CN 202110118512 A CN202110118512 A CN 202110118512A CN 112941716 A CN112941716 A CN 112941716A
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- knitting
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04C—BRAIDING OR MANUFACTURE OF LACE, INCLUDING BOBBIN-NET OR CARBONISED LACE; BRAIDING MACHINES; BRAID; LACE
- D04C1/00—Braid or lace, e.g. pillow-lace; Processes for the manufacture thereof
- D04C1/06—Braid or lace serving particular purposes
Abstract
The invention discloses a weaving and forming method of a semi-closed type conical prefabricated body, which comprises the following steps: all yarns of the fabric on the top of the die are arranged in a radial shape and pass through the center of the top circle, yarn carriers on a knitting machine are moved in a staggered mode according to rows, circumferential yarns are introduced to form interweaving with the knitting yarns, interweaving circulation is completed, and the steps are repeated until the circular fabric on the top is obtained; and fixing the circular top fabric at the top end of the mold, and continuously weaving the conical main body fabric along the circular top fabric until the semi-closed conical prefabricated body is obtained. The yarns are continuous from the top to the body part, so that the bearing performance of the top of the cone can be enhanced; the top of the cone is sealed by adopting a plurality of layers of circular fabrics, which better accords with the geometrical structure of the top of the cone, has good sealing performance and can be naturally and smoothly connected with the fabrics of the body.
Description
Technical Field
The invention belongs to the technical field of textile methods, and relates to a knitting forming method of a semi-closed conical preform.
Background
The semi-closed conical composite material is a special-shaped component which is common in aerospace field application, such as: an antenna cover body, a protective sleeve and the like. The components are required to have the performances of high temperature resistance, high strength, scouring resistance, no delamination, good air tightness and the like. The high-performance fiber three-dimensional braided fabric has the performances of delamination resistance, ablation resistance, high damage tolerance and the like due to the special structure, and the application advantage of the high-performance fiber three-dimensional braided fabric is highlighted.
At present, there are three methods for manufacturing semi-closed cone preforms: one is that the head and the body are manufactured separately and then integrated by mechanical connection, and this method is often poor in mechanical property of the connection part; the second is a needle-punching integral forming mode, although the integrity of the head and the body is ensured by the method, the interlayer performance, the damage resistance and the like of the method are still poorer compared with a three-dimensional weaving structure; the third is a three-dimensional weaving integral forming method, which not only realizes the integral forming of the head and the body, but also provides good mechanical property.
In the three-dimensional weaving and integral forming method, the patent (application No. 201210034019.9, entitled "weaving method of capping fabric") discloses a method of weaving a rectangular top fabric with a multi-layer fabric structure, and then weaving a body part by using a preset length of warp and weft to realize integral forming of the top part and the body part. The patent application No. 200610013430.2 entitled "weaving method of capping three-dimensional fabric" discloses a pure three-dimensional weaving method in which the top and the body are both three-dimensionally woven structures, and the top fabric is also rectangular. In both three-dimensional weaving and integral forming methods, the capping is carried out by weaving a rectangular woven fabric with the area equal to or similar to the area of the top, the yarns in the top fabric are all parallel to the center line of the top, and not all the yarns pass through the center point of the top.
The invention aims to provide a knitting method for sealing the top of a cone by circular knitting of yarns through the central point of the top of the cone, so as to make up for the defects of the prior art.
Disclosure of Invention
The invention aims to provide a knitting forming method of a semi-closed conical preform, which adopts yarns to realize top closure through a circular knitting fabric at the center of the top of a cone.
The invention adopts the technical scheme that a semi-closed type conical prefabricated body knitting forming method is characterized in that a forming device is adopted for knitting, the forming device comprises a knitting machine, a yarn carrier is arranged on the knitting machine, the forming device also comprises a mould, a knitting circular table is arranged above the mould, the number of the knitting machine is even, a plurality of knitting machines are uniformly distributed along the circumference of the mould, and a yarn dividing grid for separating knitting yarns on adjacent knitting machines is fixed on the knitting circular table, and the method comprises the following steps:
step 3, moving the yarn carriers which are not moved in the step 2 along the radial direction by the distance of the two yarn carriers, wherein the moving direction is the same as that of the step 2, and forming a weaving opening again; sequentially introducing circumferential yarns from outside to inside along the circumferential direction according to rows to form interweaving with the knitting yarns, finishing the whole interweaving circulation, and then restoring the yarn carrier to the initial state;
step 4, repeating the steps 2-3 until a circular top fabric is obtained;
step 5, removing the weaving circular table and the dividing grid, fixing the circular top fabric on the top end of the die, and aligning the circle center of the circular top fabric with the top point of the die;
and 6, continuously weaving the conical main body fabric along the circular top fabric until a semi-closed conical prefabricated body is obtained.
The invention is also characterized in that:
before step 1, determining the density and the size of the semi-closed type conical prefabricated body according to the external dimension of the top of the die, and calculating the yarn quantity of the circular top fabric.
And 6, weaving the conical main body fabric by adopting the interweaving circulation method in the steps 2-3.
And step 6, weaving the conical main body fabric by adopting a three-dimensional weaving four-step method.
And (4) finishing and tightening operations are required after the steps 2 and 3.
The invention has the beneficial effects that:
the weaving and forming method of the semi-closed type cone prefabricated body is suitable for cones with smaller top size and thicker body thickness than the body size; all yarns of the fabric on the top of the die are arranged in a radial shape and pass through the center of the circle on the top, and the yarns are continuous from the top to the body part, so that the bearing performance of the top of the cone can be enhanced; the top of the cone is sealed by adopting a plurality of layers of circular fabrics, which better accords with the geometrical structure of the top of the cone, has good sealing performance and can be naturally and smoothly connected with the fabrics of the body; the conical fabric is woven by high-performance fibers, so that the weight of the conical structural part can be greatly reduced, and the mechanical property is improved.
Drawings
FIG. 1 is a schematic structural diagram of a forming device adopted in the weaving and forming method of a semi-closed type conical preform of the invention;
FIG. 2 is a schematic structural view of a mold of example 1 in a knitting method of a semi-closed type conical preform of the present invention;
FIG. 3 is a schematic view of a yarn suspension in the knitting forming method of the semi-closed type conical preform according to the present invention;
FIG. 4 is a schematic structural diagram of a uniform arrangement of yarns of a circular top fabric in the knitting forming method of the semi-closed type conical preform according to the invention;
FIG. 5a is an initial state diagram of a yarn carrier in the knitting and forming method of a semi-closed type conical preform according to the present invention;
FIG. 5b is a diagram showing the state of motion of a yarn carrier in the knitting method of a semi-closed type conical preform according to the present invention;
FIG. 5c is a view showing another state of motion of a yarn carrier in the knitting method of a semi-closed type conical preform of the present invention;
FIG. 6 is a circumferential yarn distribution diagram in the knitting forming method of the semi-closed type conical preform according to the present invention;
FIG. 7 is a structural view of a circular top fabric in the knitting molding method of a semi-closed type conical preform of the present invention;
FIG. 8 is a diagram showing an operation state of a knitting method of a semi-closed type conical preform according to the present invention;
fig. 9 is a schematic structural view of a mold in embodiment 2 of a knitting method of a semi-closed type conical preform of the present invention.
In the figure: 1. the method comprises the steps of knitting, 2, a die, 3, a weaving circular table, 4, a yarn dividing grid and 5, and knitting yarns.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
A knitting forming method of a semi-closed type cone preform is disclosed, as shown in figure 1, a forming device is adopted for knitting, the forming device comprises a plurality of pairs of knitting machines 1, yarn carriers are arranged on the knitting machines 1, as shown in figure 2, the forming device also comprises a cone mold 2, a knitting circular table 3 is arranged above the mold 2, the knitting machines 1 are uniformly distributed along the circumference of the mold 2, each pair of knitting machines 1 is centrosymmetric about the knitting circular table 3, a yarn dividing grid 4 used for dividing knitting yarns 5 on the adjacent knitting machines 1 is fixed on the knitting circular table 3, and the knitting forming method comprises the following steps:
the weaving method comprises the following steps that weaving yarns 5 are hung on a weaving circular table 3 in rows, two ends of each row of weaving yarns 5 are tied on two symmetrically-arranged yarn carriers respectively, and each row of weaving yarns 5 passes through the circle center of the weaving circular table 3;
step 3, moving the yarn carriers which are not moved in the step 2 along the radial direction by the distance of the two yarn carriers, wherein the moving direction is the same as that of the step 2, and forming a weaving opening again; introducing circumferential yarns into each layer of weaving mouths from outside to inside in the circumferential direction in sequence to form interweaving with the weaving yarns 5, finishing the whole interweaving cycle, then carrying out finishing and tightening operation, and finally restoring the yarn carrier to the initial state;
step 4, repeating the steps 2-3 until a circular top fabric is obtained;
step 5, removing the weaving circular table 3 and the splitting grid 4, fixing the circular top fabric on the top end of the die 2, and aligning the circle center of the circular top fabric with the top point of the die 2;
and 6, continuously weaving the conical main body fabric along the circular top fabric by adopting the method of the steps 2-3 or a three-dimensional weaving four-step method until the semi-closed conical prefabricated body is obtained.
Example 1
and 2, evenly distributing 240 yarns to 8 knitting machines according to rows and columns, wherein each knitting machine distributes 3 columns and 10 rows of knitting yarns. As shown in fig. 3, with any 1 st line of yarn from the left as a starting point, 1, 2, 3 to 24 are marked in sequence, with 1 st line of yarn of each trolley as a starting point, 1, 2, 3 to 10 are marked in sequence, the 1 st line 1 of yarn carrier is shown as 11, the 1 st line 2 of yarn carrier is shown as 12, the 13 th line 1 of yarn carrier is shown as 131, and the 13 th line 2 of yarn carrier is shown as 132, so that each yarn carrier is shown, two yarn carriers connected by one knitting yarn 5 are called a set of symmetric yarn carriers, such as the yarn carrier 11 and the yarn carrier 131, the yarn carrier 12 and the yarn carrier 132, the yarn carrier 23 and the yarn carrier 142, and so on in fig. 3. Hang the yarn and begin from 1 st row, hang weaving yarn 5 on weaving round platform 3 according to row, every 5 both ends of weaving yarn are respectively on two symmetrical yarn carriers that set up, and every weaving yarn 5 is through the centre of a circle, first weaving yarn 5 one end is on carrying yarn carrier 11, the other end is on symmetrical yarn carrier 131, next second weaving yarn 5 one end is on carrying yarn carrier 12, the other end is on symmetrical yarn carrier 132, the third weaving yarn 5 one end is on carrying yarn carrier 13, the other end is on symmetrical yarn carrier 133, finish all weaving yarns 5 in proper order. After all the knitting yarns 5 are hung, all the yarns are uniformly distributed in the grid, as shown in fig. 4, so that the yarns cannot slide left and right in the knitting process, and the arrangement is not uniform;
step 3, after all the knitting yarns are arranged, as shown in fig. 5a, the yarn carriers of each knitting machine are in a flush state, and sequentially marked with the 1 st column from the left of any one trolley as a starting point, wherein even columns (2n) are a group of moving yarns, odd columns (2n +1) are a group of moving yarns, and the knitting cycle is performed, and the specific steps are as follows:
step a, moving according to a rule shown in fig. 5b, wherein the positions of odd-numbered lines of yarns are unchanged, and the even-numbered lines of yarns move upwards for a distance of two yarns relative to the odd-numbered lines of yarns to form a weaving opening, wherein the weaving opening is formed by one more layer of weaving openings, namely 11 layers of openings, compared with the initial layer number;
b, introducing circumferential yarns to each layer of weaving opening from inside to outside in sequence along the circumferential direction; specifically, as shown in fig. 6, a first layer of circumferential yarns is introduced into the innermost layer of yarn fell, a second layer of circumferential yarns is introduced into the second layer of yarn fell, a third layer of circumferential yarns is introduced into the third layer of yarn fell, and so on, from inside to outside, until the outermost layer of yarns is introduced, at this time, a half weaving cycle is completed, and then finishing and tightening operations are performed; finally, even-numbered lines of yarns move downwards for a distance of 2 yarn carriers, and the yarn carriers are restored to the initial parallel state;
step c, performing a second movement according to the rule shown in fig. 5 c; the even-numbered lines of yarns are fixed, and the odd-numbered lines of yarns move upwards for the distance of 2 yarn carriers to form a weaving opening again;
d, sequentially introducing circumferential yarns to each layer of weaving mouths from outside to inside along the circumferential direction; specifically, a first layer of circumferential yarns is introduced into an outermost yarn opening from outside to inside until the innermost circumferential yarns are introduced, a complete weaving cycle is performed at the moment, then finishing and tightening operations are performed, and all the introduced circumferential yarns are finished and tightened to be close to a circumferential yarn layer introduced by the last half weaving cycle (all the circumferential yarns introduced by each half cycle are called circumferential yarn layers);
step 4, repeating the steps a-d until the circular top fabric is woven, namely the fabric contour dimension meets the size requirement of the conical top in the step 1, and the woven circular top fabric surface interweaving lines are shown in fig. 7;
step 5, removing the weaving circular truncated cone 3 and the splitting grid 4, fixing the circular top fabric at the top end of the die 2, as shown in fig. 8, lifting the die 2 to a proper height along the vertical direction, fixing the top circular top fabric at the top end of the die by increasing the downward tension of the yarns, and aligning the circle center of the circular top fabric with the top point of the die 2;
and 6, continuously weaving the conical main body fabric along the circular top fabric by adopting a three-dimensional weaving four-step method until the semi-closed conical prefabricated body is obtained.
Specifically, in the first step, the yarn carriers in adjacent rows alternately move the position of one yarn carrier in the left or right direction; a second step in which the carriers of adjacent rows are alternately displaced in an upward or downward direction by the position of one carrier; a third step, opposite to the moving direction of the first step, the yarn carriers in adjacent rows alternately move one yarn carrier in the left or right direction; a fourth step of moving the position of one of the yarn carriers alternately in an upward or downward direction by the yarn carriers of the adjacent row in a direction opposite to the moving direction of the second step; thereby completing a machine cycle to weave a pattern section; the four-step method is continuously repeated, and the knitting yarns are mutually interwoven to form a final structure by matching with corresponding tightening operation; in the weaving process, along with the continuous increase of the size of the cone, in order to ensure certain fabric density, the weaving yarns are gradually increased until the semi-closed type cone prefabricated body is completely woven.
Example 2:
as shown in FIG. 9, the area size of the top circular top fabric of the mold 2 is 16mm2The thickness of the center of the circular top fabric is 10mm, and the fiber volume fraction is 45%. Adopting 155tex glass fiber, designing 360 weaving yarns to weave a circular top fabric; arranging 6 square braiders in annular arrangement to form combined equipment capable of braiding the conical member; the method comprises the following steps that symmetrical suspension knitting yarns are started, each knitting machine hangs 3 rows and 20 rows of knitting yarns, the yarns are arranged according to the rows, each yarn passes through the circle center of a knitting circular table, two ends of each yarn are tied on a group of symmetrical yarn carriers of a bottom knitting machine respectively, and the yarns are distributed in a radial mode along the circumferential direction through grids; after the yarns are arranged, weaving the circular top fabric according to the step 3 in the embodiment 1, firstly, moving the yarns in a staggered manner in the column direction, introducing 21 layers of circumferential yarns from inside to outside, then moving the weaving yarns 5 in a staggered manner, introducing the circumferential yarns from outside to inside, and matching with a tightening action until the circular top fabric meets the size requirement in weaving; and then, propping the woven circular top fabric on the top of the mold, and weaving the conical body fabric according to three-dimensional weaving four steps until the semi-closed conical prefabricated part is completely woven.
Claims (5)
1. The knitting forming method of the semi-closed type cone preform is characterized by further comprising a mold (2), a weaving circular table (3) is arranged above the mold (2), the number of the knitting machines (1) is even, the knitting machines (1) are uniformly distributed along the circumference of the mold (2), and a yarn dividing grid (4) for separating knitting yarns (5) on adjacent knitting machines (1) is fixed on the weaving circular table (3), and the knitting forming method comprises the following steps:
step 1, determining the number of knitting machines according to the size of the large end of a die (2), hanging knitting yarns (5) on a weaving circular table (3) in a row, wherein two ends of each knitting yarn (5) are tied on two symmetrically-arranged yarn carriers respectively, and each knitting yarn (5) passes through the circle center;
step 2, firstly, odd-numbered rows or even-numbered rows of yarn carriers on each knitting machine (1) move along the radial direction by the distance of two yarn carriers to form a knitting opening; sequentially introducing circumferential yarns from inside to outside along the circumferential direction according to rows to form interweaving with the knitting yarns (5), finishing half interweaving circulation, and then restoring the yarn carrier to an initial parallel state;
step 3, moving the yarn carriers which are not moved in the step 2 along the radial direction by the distance of the two yarn carriers, wherein the moving direction is the same as that of the step 2, and forming a weaving opening again; sequentially introducing circumferential yarns from outside to inside along the circumferential direction according to rows to form interweaving with the knitting yarns (5), finishing the whole interweaving circulation, and then restoring the yarn carrier to the initial state;
step 4, repeating the steps 2-3 until a circular top fabric is obtained;
step 5, removing the weaving circular truncated cone (3) and the splitting grid (4), fixing the circular top fabric on the top end of the die (2), and aligning the circle center of the circular top fabric with the top point of the die (2);
and 6, continuously weaving the conical main body fabric along the circular top fabric until a semi-closed conical prefabricated body is obtained.
2. The weaving and forming method of semi-closed type cone preform as claimed in claim 1, characterized in that before step 1, the semi-closed type cone preform density, size and yarn number of the circular top fabric are determined according to the top external dimension of the mould (2).
3. The weaving and forming method of the semi-closed type cone preform as claimed in claim 1, wherein the weaving and forming method of the interlacing cycle in step 6 is adopted to weave the cone body fabric in step 2-3.
4. The method for knitting a semi-closed type conical preform according to claim 1, wherein a conical main body fabric is knitted by a three-dimensional knitting four-step method in step 6.
5. The method for knitting and forming a semi-closed type conical preform according to claim 1, wherein finishing and tightening operations are performed after the steps 2 and 3.
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| CN202110118512.8A CN112941716B (en) | 2021-01-28 | 2021-01-28 | Weaving forming method of semi-closed type conical prefabricated body |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114875568A (en) * | 2022-04-29 | 2022-08-09 | 南京航空航天大学 | Device is implanted to rotatory prefabricated body circumference yarn of weaving |
| CN115045038A (en) * | 2022-07-26 | 2022-09-13 | 山东中恒景新碳纤维科技发展有限公司 | Preparation method of full-closed-top woven part and preparation method of composite material part thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US4799417A (en) * | 1986-06-28 | 1989-01-24 | Fly Fishing Technology Limited | Braided line |
| CN1651627A (en) * | 2005-02-23 | 2005-08-10 | 天津工业大学 | Three dimensional knitting method of variable cross section preshaped product and its product |
| CN103015029A (en) * | 2012-12-30 | 2013-04-03 | 中材科技股份有限公司 | 2.5-dimension (2.5D) multidirectional extensible weaving method |
| CN111910340A (en) * | 2020-07-24 | 2020-11-10 | 中国纺织科学研究院有限公司 | Three-dimensional weaving routing device and routing method |
-
2021
- 2021-01-28 CN CN202110118512.8A patent/CN112941716B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4799417A (en) * | 1986-06-28 | 1989-01-24 | Fly Fishing Technology Limited | Braided line |
| CN1651627A (en) * | 2005-02-23 | 2005-08-10 | 天津工业大学 | Three dimensional knitting method of variable cross section preshaped product and its product |
| CN103015029A (en) * | 2012-12-30 | 2013-04-03 | 中材科技股份有限公司 | 2.5-dimension (2.5D) multidirectional extensible weaving method |
| CN111910340A (en) * | 2020-07-24 | 2020-11-10 | 中国纺织科学研究院有限公司 | Three-dimensional weaving routing device and routing method |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114875568A (en) * | 2022-04-29 | 2022-08-09 | 南京航空航天大学 | Device is implanted to rotatory prefabricated body circumference yarn of weaving |
| CN115045038A (en) * | 2022-07-26 | 2022-09-13 | 山东中恒景新碳纤维科技发展有限公司 | Preparation method of full-closed-top woven part and preparation method of composite material part thereof |
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| CN112941716B (en) | 2022-04-26 |
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