阅读说明：本技术 碳纤维变截面中空梁及其制备方法、轨道车辆 (Carbon fiber variable cross-section hollow beam, preparation method thereof and railway vehicle ) 是由 张丽娇 于 2019-08-23 设计创作，主要内容包括：本发明涉及轨道交通领域,提供了一种碳纤维变截面中空梁及其制备方法、轨道车辆。该方法包括步骤：采用可溶材料制备变截面芯模；利用三维编织技术将碳纤维材料编织在变截面芯模表面,以获得预成型体；利用树脂传递模塑成型技术向预成型体外加注树脂材料并进行固化,以获得中间成型体；溶解去除中间成型体内的变截面芯模并进行干燥、以获得中空预成型体；利用缠绕成型技术将碳纤维材料缠绕于中空预成型体表面、以获得中空梁成型体；利用树脂传递模塑成型技术向中空梁成型体外加注树脂材料并进行固化,以获得碳纤维变截面中空梁。本发明通过利用三维编织技术、缠绕成型技术和两次树脂传递模塑成型技术就可制得强度高、质量轻的碳纤维变截面中空梁。(The invention relates to the field of rail transit, and provides a carbon fiber variable cross-section hollow beam, a preparation method thereof and a rail vehicle. The method comprises the following steps: preparing a variable cross-section core mould by adopting a soluble material; weaving a carbon fiber material on the surface of a variable cross-section core mold by using a three-dimensional weaving technology to obtain a preformed body; filling resin materials outside the preformed body by using a resin transfer molding technology and curing to obtain an intermediate formed body; dissolving and removing the variable cross-section core mold in the intermediate forming body, and drying to obtain a hollow pre-forming body; winding a carbon fiber material on the surface of the hollow preform by using a winding forming technology to obtain a hollow beam forming body; and injecting resin materials into the hollow beam forming body by utilizing a resin transfer molding technology and curing to obtain the carbon fiber variable cross-section hollow beam. The carbon fiber variable cross-section hollow beam with high strength and light weight can be prepared by utilizing a three-dimensional weaving technology, a winding forming technology and a two-time resin transfer molding forming technology.)

1. A preparation method of a carbon fiber variable cross-section hollow beam is characterized by comprising the following steps:

preparing a variable cross-section core mould by adopting a soluble material;

weaving a carbon fiber material on the surface of the variable cross-section core mold by using a three-dimensional weaving technology to obtain a preform;

filling a resin material outside the pre-forming body by using a resin transfer molding technology and curing to obtain an intermediate forming body;

dissolving and removing the variable cross-section core mold in the intermediate forming body and drying to obtain a hollow pre-forming body;

winding a carbon fiber material on the surface of the hollow preform by using a winding forming technology to obtain a hollow beam forming body;

and injecting a resin material outside the hollow beam forming body by utilizing a resin transfer molding technology and curing to obtain the carbon fiber variable cross-section hollow beam.

2. The method for manufacturing a carbon fiber variable cross-section hollow beam according to claim 1, wherein the step of filling a resin material outside the preform by using a resin transfer molding technique and curing the resin material to obtain an intermediate molded body comprises:

placing the preform into a mold cavity of a closed mold and injecting the resin material into the mold cavity at a first injection pressure;

the closed mold is placed in an oven for a first curing time at a first curing temperature to obtain an intermediate shaped body.

3. The method for manufacturing a carbon fiber variable cross-section hollow beam according to claim 2, wherein the first injection pressure is 0.05MPa to 0.15 MPa.

4. The method for preparing the carbon fiber variable cross-section hollow beam according to claim 2, wherein the first curing temperature is 75-85 ℃, and the first curing time is 1.5-2.5 hours.

5. The method for manufacturing a carbon fiber variable cross-section hollow beam according to claim 1, wherein the step of injecting a resin material outside the hollow beam forming body by using a resin transfer molding forming technology and curing the resin material to obtain the carbon fiber variable cross-section hollow beam comprises the steps of:

placing the hollow beam forming body into a mold cavity of a closed mold, and injecting the resin material into the mold cavity at a second injection pressure;

and putting the closed die into an oven, and carrying out second curing time at a second curing temperature to obtain the carbon fiber variable-section hollow beam.

6. The method for manufacturing a carbon fiber variable cross-section hollow beam according to claim 5, wherein the second injection pressure is 0.05MPa to 0.15 MPa.

7. The method for preparing the carbon fiber variable cross-section hollow beam according to claim 5, wherein the second curing temperature is 75-85 ℃, and the second curing time is 1.5-2.5 hours.

8. The method for preparing the carbon fiber variable cross-section hollow beam according to claim 1, wherein the soluble material is a water-soluble material mixed by phosphate starch and rigid filler or a water-soluble material mixed by modified starch, hollow glass beads and urea.

9. A carbon fiber variable cross-section hollow beam is characterized by comprising an inner carbon fiber layer, an inner resin layer, an outer carbon fiber layer and an outer resin layer, wherein the inner carbon fiber layer is constructed into the inner wall of the hollow beam, and the inner resin layer, the outer carbon fiber layer and the outer resin layer are sequentially covered on the outer surface of the inner carbon fiber layer from inside to outside; the inner carbon fiber layer is made of carbon fiber materials through a three-dimensional weaving technology, the outer carbon fiber layer is made of carbon fiber materials through a winding forming technology, and the inner resin layer and the outer resin layer are both made of resin materials through a resin transfer molding forming technology.

10. A rail vehicle comprising a body and a bogie, characterized in that the body and/or the bogie comprises a carbon fibre variable cross-section hollow beam according to claim 9.

Technical Field

The invention relates to the technical field of rail transit, in particular to a carbon fiber variable cross-section hollow beam, a preparation method thereof and a rail vehicle.

Background

With the continuous acceleration of life rhythm, people have higher and higher requirements on the speed of rail vehicles. However, at present, hollow beams of main bearing parts such as bogies and car bodies of railway vehicles are usually made of stainless steel or aluminum alloy materials, and the stainless steel and the aluminum alloy materials have the defects of heavy mass, low strength and the like, so that the main bearing parts also have the defects of heavy mass and low strength, and the operation speed of the railway vehicles is influenced.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art or the related art.

The invention aims to provide a carbon fiber variable cross-section hollow beam with light weight and high strength, a preparation method thereof and a railway vehicle.

In order to achieve the aim, the invention provides a preparation method of a carbon fiber variable cross-section hollow beam, which comprises the following steps:

preparing a variable cross-section core mould by adopting a soluble material;

weaving a carbon fiber material on the surface of the variable cross-section core mold by using a three-dimensional weaving technology to obtain a preform;

filling a resin material outside the pre-forming body by using a resin transfer molding technology and curing to obtain an intermediate forming body;

dissolving and removing the variable cross-section core mold in the intermediate forming body and drying to obtain a hollow pre-forming body;

winding a carbon fiber material on the surface of the hollow preform by using a winding forming technology to obtain a hollow beam forming body;

and injecting a resin material outside the hollow beam forming body by utilizing a resin transfer molding technology and curing to obtain the carbon fiber variable cross-section hollow beam.

Wherein the step of filling the resin material outside the preform by using the resin transfer molding technique and curing the resin material to obtain the intermediate molded body comprises:

placing the preform into a mold cavity of a closed mold and injecting the resin material into the mold cavity at a first injection pressure;

the closed mold is placed in an oven for a first curing time at a first curing temperature to obtain an intermediate shaped body.

Wherein the first injection pressure is 0.05MPa to 0.15 MPa.

Wherein the first curing temperature is 75-85 ℃, and the first curing time is 1.5-2.5 hours.

Wherein, the step of injecting resin material outside the hollow beam forming body by using a resin transfer molding forming technology and curing the resin material to obtain the carbon fiber variable cross-section hollow beam comprises the following steps:

placing the hollow beam forming body into a mold cavity of a closed mold, and injecting the resin material into the mold cavity at a second injection pressure;

and putting the closed die into an oven, and carrying out second curing time at a second curing temperature to obtain the carbon fiber variable-section hollow beam.

Wherein the second injection pressure is 0.05MPa to 0.15 MPa.

Wherein the second curing temperature is 75-85 ℃, and the second curing time is 1.5-2.5 hours.

The soluble material is a water-soluble material formed by mixing phosphate starch and rigid filler or a water-soluble material formed by mixing modified starch, hollow glass beads and urea.

In order to achieve the above object, the present invention also provides a carbon fiber variable cross-section hollow beam, which comprises an inner carbon fiber layer configured as an inner wall of the hollow beam, and an inner resin layer, an outer carbon fiber layer and an outer resin layer sequentially covering an outer surface of the inner carbon fiber layer from inside to outside; the inner carbon fiber layer is made of carbon fiber materials through a three-dimensional weaving technology, the outer carbon fiber layer is made of carbon fiber materials through a winding forming technology, and the inner resin layer and the outer resin layer are both made of resin materials through a resin transfer molding forming technology.

In order to achieve the above object, the present invention further provides a rail vehicle, which includes a vehicle body and a bogie, wherein the vehicle body and/or the bogie includes the carbon fiber variable cross-section hollow beam.

The invention utilizes the three-dimensional weaving technology to weave the inner wall of the hollow beam on the surface of the variable cross-section core mould, thereby not only realizing the integrated forming of the variable cross-section hollow closed structure, but also improving the fiber content of the hollow beam, enhancing the strength of the hollow beam, improving the shearing strength of the interface and obviously enhancing the tolerance of the hollow beam in all directions. On the basis, the carbon fiber variable cross-section hollow beam with high strength and light weight can be prepared by utilizing a winding forming technology and a resin transfer molding technology for two times. Compared with a hollow beam made of stainless steel, the carbon fiber variable cross-section hollow beam can reduce weight by 50%, and the strength of the carbon fiber variable cross-section hollow beam is improved by 30% compared with that of a hollow beam formed by winding once and is improved by 30% compared with that of an original stainless steel beam or aluminum alloy beam.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic flow chart of a method for manufacturing a carbon fiber variable cross-section hollow beam in example 1 of the present invention;

fig. 2 is a schematic structural diagram of a carbon fiber variable cross-section hollow beam manufactured by the method for manufacturing a carbon fiber variable cross-section hollow beam in embodiment 1 of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, unless otherwise specified, the terms "upper", "lower", "inside", "outside", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.