阅读说明：本技术 一种双层连续缠绕针刺筒形件及其制备方法 (Double-layer continuously-wound needling cylindrical part and preparation method thereof ) 是由 尹锋 于 2020-05-22 设计创作，主要内容包括：本发明公开了一种双层连续缠绕针刺筒形件及其制备方法,该方法包括以下步骤：(1)将碳纤维制成碳纤维网毡；(2)将碳纤维经织机分别编织成单向布和双向布；(3)将单向布和双向布各自与碳纤维网毡针刺复合预定型分别形成单向复合料和双向复合料；(4)将所述的单向复合料和双向复合料各经自动收卷装置规整收卷；(5)将双向复合料和单向复合料在圆筒模具表层叠层定型,引入恒定张力连续旋转缠绕针刺制成双层连续缠绕针刺筒形件。本发明方法制备的新型双层连续缠绕针刺筒形件,轴向和环向纤维布整体连续缠绕无接缝、无断层连续针刺成形,使得整体强度比以往的同类产品要高,且整体稳定性好,而且相比以往的制备工艺,又大幅度缩短了制造周期,降低了生产成本。(The invention discloses a double-layer continuous winding needling cylindrical part and a preparation method thereof, wherein the method comprises the following steps: (1) preparing carbon fibers into a carbon fiber net felt; (2) weaving carbon fibers into unidirectional cloth and bidirectional cloth by a weaving machine respectively; (3) respectively forming a unidirectional composite material and a bidirectional composite material by needling, compounding and preshaping the unidirectional cloth and the bidirectional cloth with a carbon fiber net felt; (4) orderly winding the unidirectional composite material and the bidirectional composite material by an automatic winding device; (5) and (3) laminating and shaping the bidirectional composite material and the unidirectional composite material on the surface layer of the cylinder mould, introducing constant tension to continuously rotate and wind acupuncture to prepare a double-layer continuously-wound acupuncture cylindrical part. The novel double-layer continuous winding needling cylindrical part prepared by the method is integrally and continuously wound on the axial and circumferential fiber cloth without seams and faults and is formed by continuous needling, so that the integral strength is higher than that of the conventional similar products, the integral stability is good, the manufacturing period is greatly shortened and the production cost is reduced compared with the conventional preparation process.)

1. A preparation method of a double-layer continuously wound needling cylindrical part is characterized by comprising the following steps:

(1) short cutting carbon fibers into pieces with the length of 70 +/-5 mm, and opening the pieces to prepare a carbon fiber net felt through airflow circulation equipment;

(2) weaving carbon fibers into unidirectional cloth and bidirectional cloth by a weaving machine respectively;

(3) respectively forming unidirectional composite material and bidirectional composite material by the unidirectional cloth and the bidirectional cloth and the carbon fiber net felt prepared in the step (1) through needling, compounding and presetting;

(4) orderly winding the unidirectional composite material and the bidirectional composite material by an automatic winding device;

(5) and (3) laminating and shaping the bidirectional composite material and the unidirectional composite material on the surface layer of the cylinder mould, introducing constant tension to continuously rotate and wind acupuncture to prepare a double-layer continuously-wound acupuncture cylindrical part.

2. The method for producing a double-layered continuously wound needled cylinder according to claim 1, wherein the areal density of the carbon fiber net felt in step (1) is 20 to 100g/m²。

3. The method for preparing a double-layer continuously wound needled cylinder according to claim 1, wherein the areal density of said unidirectional fabric in step (2) is 100-400g/m²(ii) a The surface density of the two-way cloth is 100-²。

4. The method for producing a double-layered continuously wound needled cylinder according to claim 1, wherein said pre-determined needling density in step (3) is 5 to 10 needles/cm²。

5. The method for preparing a double-layer continuously wound needled cylinder according to claim 1, wherein the net felts in the unidirectional composite material and the bidirectional composite material in step (3) are not burred and just cover the unidirectional cloth and the bidirectional cloth.

6. The method for preparing a double-layer continuously wound needled cylinder according to claim 1, wherein the unidirectional composite material and the bidirectional composite material in step (4) need to be wound neatly, and no wrinkles can be formed in the surface of the composite material.

7. The method for preparing a double-layer continuously wound needled cylinder according to claim 1, wherein said bidirectional composite and unidirectional composite in step (5) are continuously wound and needled with constant tension.

8. The method for producing a double-layered continuously wound needled cylinder according to claim 1, wherein the bulk density of the double-layered continuously wound needled cylinder produced in step (5) is: 0.30-0.70g/cm³。

9. A double layer continuous wound needled cylinder prepared according to the method of any one of claims 1-8.

Technical Field

The invention belongs to the technical field of carbon-carbon composite materials, and particularly relates to a double-layer continuous winding needling cylindrical part and a preparation method thereof.

Technical Field

The carbon fiber needling cylindrical part is widely used in the technical field of carbon-carbon composite materials, and has the main advantages of ultrahigh temperature resistance, good fatigue resistance, good corrosion resistance, light weight and high specific performance; however, most of the existing manufacturing technologies adopt a technology of superposing a layer of net felt needling by a layer of bidirectional cloth laying layer and superposing a layer of net felt needling by a layer of circumferential yarn winding laying layer, and the cylindrical part prefabricated body is manufactured by sequentially circulating laying needling; the disadvantages are that: each layer of the bidirectional fabric is broken to form seams, and the fabric fibers are not staggered, so that the mechanical property of the product is influenced; the fibers of the hoop yarn winding layer are unevenly distributed, so that the fiber layers are easily stacked or spaced, and the integral stability of the product is influenced due to uneven tension of the introduced fibers. Aiming at the defects of the prior art, the invention provides a novel preparation method of a double-layer continuous winding needling cylindrical part, and can greatly improve the working efficiency and reduce the production cost.

Disclosure of Invention

Aiming at the problems in the prior art of preparing the cylindrical part, the invention provides a novel double-layer continuous winding needling cylindrical part and a preparation method thereof.

In order to achieve the above purpose, the invention can adopt the following technical scheme:

a method for preparing a double-layer continuously wound needled cylindrical part comprises the following steps:

(1) short cutting carbon fibers into pieces with the length of 70 +/-5 mm, and opening the pieces to prepare a carbon fiber net felt through airflow circulation equipment;

(2) weaving carbon fibers into unidirectional cloth and bidirectional cloth by a weaving machine respectively;

(3) respectively forming unidirectional composite material and bidirectional composite material by the unidirectional cloth and the bidirectional cloth and the carbon fiber net felt prepared in the step (1) through needling, compounding and presetting;

(4) orderly winding the unidirectional composite material and the bidirectional composite material by an automatic winding device;

(5) and (3) laminating and shaping the bidirectional composite material and the unidirectional composite material on the surface layer of the cylinder mould, introducing constant tension to continuously rotate and wind acupuncture to prepare a double-layer continuously-wound acupuncture cylindrical part.

As a preferable technical scheme, the surface density of the carbon fiber net felt in the step (1) is 20-100g/m²。

As a preferred technical proposal, the areal density of the unidirectional cloth in the step (2) is 100-400g/m²(ii) a The surface density of the two-way cloth is 100-²。

As a preferable technical scheme, the pre-shaping needling density in the step (3) is 5-10 needles/cm²。

As a preferable technical scheme, the net felts in the unidirectional composite material and the bidirectional composite material in the step (3) can not have burrs (the burrs of the net felts need to be trimmed) and just cover the unidirectional cloth and the bidirectional cloth.

As a preferred technical scheme, the unidirectional composite material and the bidirectional composite material in the step (4) need to be rolled up neatly, and no folds can be formed in the surface of the composite material.

As a preferable technical scheme, when the bidirectional composite material and the unidirectional composite material in the step (5) are continuously wound and needled, constant tension is required to be introduced, and the introduced constant tension is 10-100N.

As a preferred technical scheme, the volume density of the double-layer continuous winding needling cylinder preform prepared in the step (5) is as follows: 0.30-0.70g/cm³。

The invention also provides the double-layer continuous winding needling cylindrical part prepared by the method.

The beneficial technical effects of the invention are as follows:

the invention has researched and developed a new kind of double-deck consecutive winding needling tube-shaped part and its preparation method, axial and toroidal fiber cloth twine continuously integrally and have no seam, have no fault consecutive needling to take shape, make the integral strength higher and integral stability better than the previous like products, the intensity of the existing like goods is 0.018MPa, and the intensity of the product of the invention is 0.036 MPa; compared with the prior preparation process, the preparation process greatly shortens the manufacturing period (the manufacturing period of the product is determined by the thickness of the product, and the manufacturing time of the product with the same thickness can be shortened by nearly half compared with the existing preparation method), thereby reducing the production cost.

Drawings

FIG. 1 is a drawing showing the lamination and shaping of a bidirectional composite material and a unidirectional composite material on the surface layer of a cylindrical part.

Detailed Description

The present invention will be described in detail with reference to examples.