A high-efficiency preparation device for tubular cylindrical fiber preform

Abstract

The present invention discloses a high-efficiency preparation device for a tubular cylindrical fiber preform, characterized by: a suture needle (1), a core mold (2), a servo motor (3), and a fiber cloth limiting roller (4). The present technology designs the center angle of the suture needle (1) so that the fiber cloth is guided by the suture needle (1) when it is wound around the core mold (2), and falls accurately on the surface of the core mold without wrinkles. The suture needle (1) and the suture fiber are embedded in the core mold (2) in advance, and after the fiber cloth is wound to the required thickness of the preform, the embedded suture needle (1) and the suture fiber pass through the surface of the preform to achieve the suture effect.

Description

Technical Field

[0001] The present application relates to the technical field of high-efficiency preparation of composite material preforms, and in particular to a high-efficiency preparation device for a tubular columnar fiber preform. Background Art

[0002] The tubular column composite fiber preform is a commonly used structure in the field of composite materials. The strongest structure of the tubular fiber preform is formed by winding a complete fiber cloth on a core mold. In the existing preparation process, the tubular column composite fiber preform is also made of fiber cloth wound on a core mold. In order to ensure the tightness of the preform, a mesh tire is added and needle-punched while winding. However, the method of adding a mesh tire and needle-punching is very inefficient, and because a mesh tire needs to be added to each layer, the wall thickness of the preform is increased, resulting in a "fat" phenomenon in the preform, which affects the product quality of the preform. In addition, the mesh tire and needle-punching method is far less strong than the suture process.

[0003] The existing stitching process also requires the removal of the core mold for stitching after the preform is fixed with the mesh. Some preforms cannot be stitched effectively and evenly because the core mold is too small and the wall thickness is too thick. Summary of the invention

[0004] In order to overcome the shortcomings of the prior art, the present invention provides a method of embedding a suture needle (1) into a core mold (2) in advance, thereby effectively sutured a tubular column composite material fiber preform.

[0005] The present invention discloses a high-efficiency preparation device for a tubular column fiber preform, characterized by: a suture needle (1), a core mold (2), a servo motor (3), and a fiber cloth limiting roller (4); the core mold (2) is parallel to the fiber cloth limiting roller (4), and the fiber cloth limiting roller (4) is rotated by a motor to release the fiber cloth to feed the core mold (2).

[0006] A high-efficiency preparation device for a tubular columnar fiber preform, characterized in that: the core mold (2) is formed by alternately combining a limiting disk (5) and a needle limiting disk (6); after the required length of the core mold (2) is prepared, the needle limiting disk (6) regularly arranges needle grooves in rows and columns, and a special suture needle (1) is placed in each needle groove, and the directions of the inserted suture needles (1) are all consistent. After each row of suture needles (1) is placed, a metal strip is placed in the side hole of the limiting disk (5) to lock the suture needles (1).

[0007] A high-efficiency preparation device for a tubular cylindrical fiber preform, characterized in that: Figure 5 As shown, the circular needle portion (7) is in a gradually changing arc shape, and the angle between the connecting line between the needle head and the pin of the suture needle (1) and the tangent line of the circle where the pin is located is 0°-60°.

[0008] A high-efficiency preparation device for a tubular cylindrical fiber preform, characterized in that: Figure 6 As shown, the connecting line of the needle and the pin is x, the angle between x and the tangent line of the circle where the pin C is located is α, the arc of the needle is the AC arc, R is the radius of the core mold (2), n is the thickness of the fiber cloth covering, B is the point where the fiber cloth and the core mold (2) are tangent when the fiber cloth and the needle A intersect, β is the angle value of the central angle formed by the pins C and B, β satisfies the formula 2πRβ / 360=tan(β / 2)°(R+n)+xsinα° / sinβ°, γ is the dynamic value of the central angle when n gradually increases, γ is always less than β, and γ satisfies the formula 2πRγ / 360=(R+n)tan(γ / 2)°+nsin(α+β / 2-γ / 2)°sin(α+β / 2-γ / 2)° / sin(γ)°.

[0009] A high-efficiency preparation device for a tubular cylindrical fiber preform, characterized in that the curvature radius y of the suture needle (1) satisfies the formula: y=(R+n)tan(β / 2)°+[xn / sin(α+γ / 2)°]sin(α+β / 2-γ / 2)° / sinβ°.

[0010] Furthermore, during the process of winding the fiber cloth around the core mold (2), the straight line distance AB must be kept equal to the arc length BC. Therefore, the present invention places very strict requirements on the curvature of the suture needle (1). As the wall thickness n of the preform increases, the exposed length [xn / sin (α+γ / 2)°] of the suture needle (1) will decrease, and the central angle γ will also decrease. The formula for the curvature radius y of the suture needle (1) is used to prepare the suture needle (1). When piercing the fiber cloth, the fiber cloth is fixed in the best position to maintain the flatness of the preform layer.

[0011] A high-efficiency preparation device for a tubular column fiber preform, characterized in that: the base portion (8) is flat; there are two holes on the base portion (8), one hole is used for pulling the suture thread, and the other hole plays a limiting role; the base portion (8) can be inserted into a needle limiting disk (6), and the thickness of the base portion (8) is the same as the thickness of the needle limiting disk (6).

[0012] A high-efficiency preparation device for a tubular columnar fiber preform, characterized in that the length of the core mold (2) is adjustable.

[0013] A high-efficiency preparation device for a tubular column fiber preform, characterized in that the suture needle (1) is made of a high-rigidity material.

[0014] A high-efficiency preparation device for a tubular cylindrical fiber preform, characterized in that the limiting disk (5) has a through circular hole, a long metal strip is inserted into the through circular hole, and repeatedly penetrates the limiting disk (5) and the base part (8) to limit the suture needle (1).

[0015] A high-efficiency preparation device for a tubular column fiber preform, characterized in that: the core mold (2) is covered with suture needles (1) in a rows and b columns, a and b are both positive integers, and the distance between the rows and columns of the suture needles (1) is 1 cm-10 cm.

[0016] A high-efficiency preparation device for a tubular column fiber preform, characterized in that: the bending directions of the suturing needles (1) are consistent; when the core mold (2) is working, the convex direction of the suturing needles (1) is the rotation direction of the core mold (2). BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the state of the core mold (2) piercing the fiber cloth when working;

[0018] Figure 2 A schematic diagram of the main components of the device;

[0019] Figure 3 A schematic diagram of the combination of the core mold (2) and the suture needle (1);

[0020] Figure 4 A plan view of the combination of the core mold (2) and the suture needle (1);

[0021] Figure 5 is a schematic diagram of a suture needle (1);

[0022] Figure 6 This is an analytical diagram of the state of the core mold (2) piercing the fiber cloth when it is working. DETAILED DESCRIPTION

[0023] A carbon-carbon thermal field component was prepared. The component was a hollow cylinder, and the hollow part was also a cylinder with an outer diameter of 24 cm, an inner diameter of 18 cm, and a height of 80 cm.

[0024] A carbon-carbon thermal field component core mold (2) is prepared as required. The effective part of the core mold (2) is 80 cm long and has an inner diameter of 18 cm. A suture needle (1) with a required curvature is prepared. The suture needle (1) is 12 cm long and the round needle part (7) has a diameter of 0.05 cm. The suture needle (1) is penetrated with a carbon fiber bundle.

[0025] The core mold (2) and the carbon cloth are installed on the support frame. A row of 20 suture needles (1) are installed on the core mold (2). After being locked with a metal insert, the suture needles (1) are blocked by a special baffle after installation to protect people from injury. The installation of the second row of suture needles (1) begins. This process is repeated 7 times to complete the installation of 8 rows and 20 columns of suture needles (1). A 12k coarse fiber is placed in each row of needles as a lock.

[0026] The carbon cloth parallel to the core mold (2) is released, and the carbon cloth is slightly tightened and buckled on a row of sewing needles (1), and the machine is started to slowly wind; during the winding process, it is necessary to carefully observe whether the sewing needles (1) are completely through the fiber cloth; when the winding width reaches 6 cm thick, the metal inserts are removed from both sides of the core mold (2), and the sewing needles (1) are removed in turn to sew the preform. The single-strand through-stitching process is used for sewing.

Claims

1. A high-efficiency preparation device for a tubular cylindrical fiber preform, characterized in that: A suture needle (1), a core mold (2), a servo motor (3), and a fiber cloth limiting roller (4); the fiber cloth limiting roller (4) has a slight rotational resistance to give the fiber cloth tension; the core mold (2) is formed by alternating a limiting disk (5) and a needle limiting disk (6); the suture needle (1) is divided into a circular needle part (7) and a base part (8); the circular needle part (7) is exposed outside the core mold (2); the circular needle part (7) is thicker than the wall thickness of the preform; the circular needle part (7) is in an arc shape, and the circular needle part (7) is in a gradual arc shape; the base part (8) is flat; the base part (8) has two holes, one hole is used for pulling the suture thread, and the other hole plays a limiting role; The base portion (8) can be inserted into the needle limiting disk (6), and the thickness of the base portion (8) is the same as that of the needle limiting disk (6); the length of the core mold (2) can be adjusted; the limiting disk (5) has a through circular hole, and a long metal strip is inserted into the through circular hole, which repeatedly penetrates the limiting disk (5) and the base portion (8) to limit the suture needle (1); the suture needle (1) is made of high-rigidity material; the suture needles (1) are covered on the core mold (2) in 8 rows and 20 columns; the distance between the rows and columns of the suture needles (1) is 1 cm-10 cm; the bending direction of the suture needles (1) is consistent; when the core mold (2) is working, the convex direction of the suture needle (1) is the rotation direction of the core mold (2).

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