CN114836896B - Core mold leading-out method and device for three-dimensional weaving of shell preform with special-shaped section - Google Patents
Core mold leading-out method and device for three-dimensional weaving of shell preform with special-shaped section Download PDFInfo
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- CN114836896B CN114836896B CN202210408280.4A CN202210408280A CN114836896B CN 114836896 B CN114836896 B CN 114836896B CN 202210408280 A CN202210408280 A CN 202210408280A CN 114836896 B CN114836896 B CN 114836896B
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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
- D04C3/00—Braiding or lacing machines
- D04C3/40—Braiding or lacing machines for making tubular braids by circulating strand supplies around braiding centre at equal distances
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Abstract
The invention discloses a core mold leading-off method and a core mold leading-off device for three-dimensional weaving of a shell preform with a special-shaped section, which comprise the following steps: (1) Selecting a forming core mold with the shape consistent with that of the prefabricated part, and mounting the forming core mold at the bottom end of the electric cylinder; (2) A braiding machine is arranged below the forming core mold, and a plurality of groups of yarn carriers on the braiding machine drive yarns to be mutually staggered on the forming core mold for braiding to form a braided fabric; meanwhile, the forming core mold is drawn by the electric cylinder to move up and down along a straight line, and the drawing speed of the electric cylinder and the position of the forming core mold are controlled in real time according to the movement time and the pitch height of the yarn carrier; the pitch height is the lifting height of the braided fabric in one unit cell period of the braiding machine; (3) And after the weaving process is finished, taking out the prefabricated body obtained by weaving along with the forming core mold. The invention can realize the cooperative coordination of yarn movement and the traction of the forming core mold in the weaving process and reduce the deformation and fiber bundle damage in the weaving process of the prefabricated body.
Description
Technical Field
The invention relates to the technical field of three-dimensional weaving core mold leading-off, in particular to a core mold leading-off method and device for three-dimensional weaving of a shell preform with a special-shaped cross section.
Background
Composite materials have attracted much attention because of their excellent mechanical properties, and preforms are the most basic reinforcing structures for composite materials, and are the skeletons of composite materials. The structure of the prefabricated body is determined by the weaving process, and the mechanical property of the prefabricated body is highly related to the geometric structure.
At present, a winding drum shaft or a mechanical arm is generally adopted in the research of a three-dimensional weaving lifting mechanism, the winding drum shaft can only realize uniform lifting, the mechanical arm is relatively expensive and lacks feedback, and the cooperative matching of yarn movement and core mold traction cannot be realized, so that a prefabricated body generates deformation and fiber bundle damage in the weaving process, and finally the compact forming and mechanical properties of a composite material are difficult to ensure.
Disclosure of Invention
The purpose of the invention is as follows: aiming at the defects, the core die leading-off method for three-dimensional weaving of the shell preform with the special-shaped section can realize the forming of the three-dimensional preform and solve the problem of cooperative matching of yarn movement and core die drawing during weaving. Meanwhile, the invention also discloses a core mould leading-out device for three-dimensional weaving of the shell preform with the special-shaped section, which can realize the core mould leading-out method.
The technical scheme is as follows: in order to solve the problems, the invention provides a core mould leading-out method for three-dimensionally weaving a shell preform with a special-shaped cross section, which comprises the following steps:
(1) Selecting a forming core mould with the shape consistent with that of the prefabricated body, and mounting the forming core mould on an end shaft at the bottom of the electric cylinder;
(2) A braiding machine is arranged below the forming core mold, and a plurality of groups of yarn carriers on the braiding machine drive yarns to be mutually staggered on the forming core mold for braiding to form a braided fabric; meanwhile, the forming core mold is drawn by the electric cylinder to move up and down along a straight line, and the drawing speed of the electric cylinder and the position of the forming core mold are controlled in real time according to the movement time and the pitch height of the yarn carrier; the pitch height is the lifting height of the knitted fabric in one motion cycle of the knitting machine;
(3) And after the weaving process is finished, taking out the woven preform obtained by weaving along with the forming core mold.
Further, the concrete formula of the real-time electric cylinder control traction speed according to the movement time and the pitch height of the yarn carrier in the step (2) is as follows:
the concrete formula of the real-time electric cylinder control traction speed according to the movement time and the pitch height of the yarn carrier in the step (2) is as follows:
wherein v represents the speed of the electric cylinder traction; h represents the pitch height;
representing the movement time of the yarn carrier; w1 represents the angular velocity of the dial in the knitting machine; w2 represents the angular velocity of the horn ring in the knitting machine; Δ t represents the time between the step motion of the dial and the hornThe gap time of (d);
further, in the step (1), a hole is formed in the center of the top of the forming core mold, and the forming core mold is mounted on an end shaft at the bottom of the electric cylinder in an interference fit mode.
Further, the step (1) further comprises the step of installing the electric cylinder on the supporting frame.
In addition, the invention provides a core mould leading-off device for three-dimensional weaving of a shell preform with a special-shaped section, which comprises a forming core mould leading-off system and a weaving machine, wherein the core mould leading-off system comprises an electric cylinder, a forming core mould and a supporting frame; the electric cylinder is arranged on the support frame, and the forming core mold is in interference fit with an end shaft at the bottom of the electric cylinder; the braiding machine is positioned under the forming core mould, and a plurality of groups of yarn carriers on the braiding machine drive the yarns to be mutually staggered on the forming core mould for braiding.
Furthermore, the bottom of the support frame is also provided with a frame.
Furthermore, the knitting machine is of a horizontal or vertical structure.
Further, the section of the forming core mold is circular, polygonal or other geometric shapes; the forming core mold is made of metal, wood or composite materials.
Has the advantages that: compared with the prior art, the method has the following remarkable advantages: the forming core mold with the consistent shape of the prefabricated body is installed below an electric cylinder shaft, a plurality of groups of yarn carriers drive yarns to be staggered on the forming core mold for weaving, the electric cylinder is used as a traction device to drive the core mold to move up and down along a straight line, the braided prefabricated body of the special-shaped revolving body is finally obtained, and the core mold and the braided prefabricated body are taken out together, so that the near-net forming of the braided fabric of the shell prefabricated body with the special-shaped cross section is realized; meanwhile, the cooperative matching of yarn movement and core mold traction is realized, the deformation and fiber bundle damage in the weaving process of the prefabricated body are effectively reduced, and finally the compact forming and mechanical properties of the composite material are ensured. Compared with the prior art, the device of the invention has the following remarkable advantages: the device can realize the forming of the prefabricated body and finish the core mould leading-off method in the weaving process of the prefabricated body.
Drawings
FIG. 1 is a flow chart of the method of the present invention;
fig. 2 is a schematic view illustrating the core mold according to the present invention being pulled away;
FIG. 3 is a schematic view showing the weaving of the preform according to the present invention;
FIG. 4 is a diagram of a preform formed using the present invention and a woven member of the preform; 4 (a) shows a weaving component of the special-shaped section shell prefabricated body; 4 (b) is a special-shaped section shell preform.
Detailed Description
The technical scheme of the invention is further explained by combining the attached drawings.
As shown in fig. 2 and 3, the present invention further provides a core mold leading-off device for three-dimensional weaving of a shell preform with a special-shaped cross section, which specifically comprises: a core mould leading-off system 1 and a knitting machine 2; the core mold leading-out system 1 comprises an electric cylinder 11, a forming core mold 12, a support frame 13 and a rack 14. The shape of the forming core 12 is the same as the preform to be woven, and the cross-section of the forming core 12 may be circular, polygonal or of other geometric shapes, depending on the shape of the preform. The top of the forming core mold 12 is provided with a hole, the aperture of the hole is smaller than the axial diameter of the electric cylinder 11, and the bottom axial end of the electric cylinder 11 is in interference fit with the forming core mold 12 through the hole, so that the forming core mold 12 cannot fall off in the weaving process. A support frame 13 is provided around the electric cylinder 11 to fix the electric cylinder 11, thereby maintaining the stability of the forming core mold 12, and a frame 14 is provided below the support frame 13 to further stabilize the forming core mold 12. A knitting machine 2 is arranged below the forming core mould 12, a plurality of groups of yarn carriers 22 are arranged on a chassis 21 of the knitting machine 2, and the yarn carriers 22 drive yarns 23 to be interlaced on the forming core mould 12 for interweaving and knitting to form a knitted fabric. Knitting machine 2 may alternatively be of a horizontal or vertical configuration. The forming mandrel 12 may be made of metal, wood or a composite material.
As shown in fig. 1, the invention further provides a core mold leading-out method for three-dimensional weaving of the shell preform with the special-shaped cross section, which specifically comprises the following steps:
step one, installing a core mold leading-off system;
(1) The electric cylinder is fixedly arranged on the support frame, so that the influence of the vibration of the electric cylinder on the stability of the weaving process is prevented;
(2) Selecting a forming core mold with the shape consistent with that of the required composite material preform to realize the near-net forming of the special-shaped section shell preform braided fabric;
(3) Punching is carried out at the center of the forming core mold, the aperture is slightly smaller than the axial diameter of the electric cylinder, the forming core mold is arranged at the bottom axial end of the electric cylinder, and the interference fit of the forming core mold and the electric cylinder ensures that the forming core mold cannot fall off in the weaving process;
step two, weaving and forming the prefabricated body;
and starting the braiding machine, wherein a plurality of groups of yarn carriers of the braiding machine drive yarns to be mutually staggered on the forming core mold for braiding, and in the braiding process, the electric cylinder pulls the forming core mold to form the braided fabric. Specifically, the method comprises the following steps:
(1) The motion time of the yarn carrier depends on the angular speed w1 of the driving plate and the angular speed w2 (unit: rad/min) of the angle wheel; the gap time between the stepping motions of the dial (not shown) and the horn (not shown) is set to Δ t. The movement time of the yarn carrier in one unit cell cycle (minimum movement cycle) is then:
(2) A closed-loop servo electric cylinder is adopted to pull the forming core mold, the rotary motion of the servo electric cylinder is converted into linear motion, and the accurate revolution control is realized;
(3) The traction speed of the electric cylinder is matched with the movement speed of the yarn carrier and the pitch h (unit: mm), and the pitch height is the lifting height of the braided fabric in one unit cell period of the braiding machine;
namely, the following conditions are met:
the traction speed is controlled to be matched with the movement speed and the pattern pitch of the driving plate and the horn gear, so that the speed and the position are accurately controlled in real time, high-precision linear movement is realized, the product contour surface precision can be met, and the deformation and the fiber bundle damage in the weaving process of the prefabricated part are reduced.
Step three, obtaining a prefabricated body
And after the weaving process is finished, taking out the woven preform obtained by weaving along with the forming core mold.
As shown in FIG. 4, the drawing of the three-dimensional irregular cross-section preform obtained by the method and apparatus provided by the present invention can be seen from FIG. 4 (b), and the woven member of the preform in FIG. 4 (a) is formed after resin filling. In conclusion, the method and the device disclosed by the invention can realize the forming of the three-dimensional preform, solve the problem of the cooperative matching of yarn movement and core mold traction in the weaving process and realize high-precision and high-efficiency weaving.
Claims (7)
1. A core mold leading-out method for three-dimensional weaving of a shell preform with a special-shaped section is characterized by comprising the following steps:
(1) Selecting a forming core mold with the shape consistent with that of the prefabricated part, and mounting the forming core mold on an end shaft at the bottom of the electric cylinder;
(2) A braiding machine is arranged below the forming core mold, and a plurality of groups of yarn carriers on the braiding machine drive yarns to be mutually staggered on the forming core mold for braiding to form a braided fabric; meanwhile, the forming core mold is drawn by the electric cylinder to move up and down along a straight line, and the drawing speed of the electric cylinder and the position of the forming core mold are controlled in real time according to the movement time and the pitch height of the yarn carrier; the pitch height is the lifting height of the braided fabric in one unit cell period of the braiding machine;
the specific formula for controlling the speed of electric cylinder traction in real time according to the movement time and the pitch height of the yarn carrier is as follows:
wherein v represents the speed of the electric cylinder traction; h represents the pitch height;
representing the movement time of the yarn carrier; w1 represents the angular velocity of the dial in the knitting machine; w2 represents the angular velocity of the horn ring in the knitting machine; Δ t represents the gap time between the step motion of the dial and the horn wheel;
(3) And after the weaving process is finished, taking out the woven preform obtained by weaving along with the forming core mold.
2. The method for leading away the core mold of the three-dimensional weaving of the shell preform with the special-shaped section as claimed in claim 1, wherein in the step (1), a hole is formed in the center of the top of the forming core mold, and the forming core mold is mounted on an end shaft at the bottom of the electric cylinder in an interference fit mode.
3. The method for leading away a core mold for three-dimensional weaving of a shell preform with a special cross section as claimed in claim 2, wherein the step (1) further comprises mounting an electric cylinder on the supporting frame.
4. The core mould leading-out device for three-dimensional weaving of the shell prefabricated body with the special section for implementing the method according to claim 3 is characterized by comprising a forming core mould leading-out system (1) and a weaving machine (2), wherein the core mould leading-out system (1) comprises an electric cylinder (12), a forming core mould (11) and a support frame (13); the electric cylinder (12) is arranged on the support frame (13), and the forming core mold (11) is in interference fit with an end shaft at the bottom of the electric cylinder (12); the knitting machine (2) is positioned right below the forming core mould (11), and a plurality of groups of yarn carriers on the knitting machine (2) drive yarns to be interlaced on the forming core mould (11) for knitting.
5. The device for leading away the core mould of the three-dimensional weaving of the shell preform with the special-shaped section is characterized in that a rack (14) is further arranged at the bottom of the supporting frame (13).
6. The device for leading away the core mold for three-dimensional weaving of the shell preform with the special section as claimed in claim 4, characterized in that the weaving machine (2) is of a horizontal or vertical structure.
7. The device for leading away the core mould of the three-dimensional weaving of the shell preform with the special-shaped cross section as claimed in claim 4, wherein the cross section of the forming core mould is circular, polygonal or other geometric shapes; the forming core mold is made of metal, wood or composite materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210408280.4A CN114836896B (en) | 2022-04-19 | 2022-04-19 | Core mold leading-out method and device for three-dimensional weaving of shell preform with special-shaped section |
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| CN202210408280.4A CN114836896B (en) | 2022-04-19 | 2022-04-19 | Core mold leading-out method and device for three-dimensional weaving of shell preform with special-shaped section |
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| CN114836896A CN114836896A (en) | 2022-08-02 |
| CN114836896B true CN114836896B (en) | 2023-03-28 |
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Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0674542B2 (en) * | 1990-08-25 | 1994-09-21 | 村田機械株式会社 | Composition method of braid structure |
| IT1311256B1 (en) * | 1999-10-26 | 2002-03-04 | Lgl Electronics Spa | DEVICE AND METHOD OF HANDLING AND CONTROL OF THE WEFT WINDING ARM IN WEFT FEEDERS FOR WINDOW FRAMES |
| TWI250234B (en) * | 2005-04-29 | 2006-03-01 | Chih-Chuan Huang | Apparatus of circular braiding for complex shape forming by warp threads guiding |
| CN103046223B (en) * | 2013-01-20 | 2014-11-12 | 天津工大航泰复合材料有限公司 | Method and device for forming two-dimensional knitted prefabricated member with special variable cross-section curved surface |
| CN109629108B (en) * | 2019-01-10 | 2021-05-28 | 天津工业大学 | Two-dimensional three-dimensional braiding machine using closed annular core mold |
| CN110923940B (en) * | 2019-11-19 | 2021-03-05 | 东华大学 | Large-diameter multilayer composite pipe weaving forming equipment and method |
| CN114197110B (en) * | 2021-11-23 | 2022-10-21 | 南京航空航天大学 | Automatic three-dimensional weaving equipment and method for composite material |
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