Method for producing a hollow support from a fiber composite material, core designed as a hollow body, use of said core, and use of said hollow support made from fiber composite

Patent metadata

Field	Value
Publication number	US-11331865-B2
Application number	US-201816484783-A
Country	US
Kind code	B2
Filing date	Feb 1, 2018
Priority date	Feb 9, 2017
Publication date	May 17, 2022
Grant date	May 17, 2022

Abstract

The application relates to a method for producing a hollow support from a fiber composite material, to a core designed as a hollow body, to the use of said core, and to the use of said hollow support made from fiber composite material.

First claim

The invention claimed is:

1. Method for producing a hollow support from a fibre composite material, comprising at least the following method steps:
a) preparing a moulded body, formed as a hollow body, from a fibre composite material comprising reinforcing fibres and a soluble plastic matrix made of a matrix material soluble using a solvent;
b) arranging a vacuum setup comprising at least one film-like layers, or a pressure hose, on the outer surface of the moulded body;
c) depositing the reinforcing fibres of the hollow support on the outer surface of the vacuum setup or pressure hose arranged on the outer surface of the moulded body to form a hollow support preform;
d) arranging the hollow support preform in an outer tool;
e) infiltrating the reinforcing fibres of the hollow support with matrix material;
f) generating a negative pressure between vacuum setup and inner surface of the outer tool or a positive pressure between outer surface of the moulded body and pressure hose;
g) consolidating the fibre composite of the hollow support made of reinforcing fibres and matrix material with the formation of an outer surface of the hollow support formed on the inner surface of the outer tool;
h) removing the consolidated hollow support from the outer tool;
i) removing the soluble plastic matrix of the moulded body by dissolving using a solvent;
j) removing the reinforcing fibres of the moulded body and of the vacuum setup via one of the front sides of the hollow support.

2. Method for producing a hollow support from a fibre composite material according to claim 1 , wherein the preparation of the moulded body in method step a) comprises
forming the outer surface of the moulded body made of fibre composite material on the inner surface of a two- or multi-part outer tool
or
forming the inner surface of the moulded body made of fibre composite material on the outer surface of a core as inner tool.

3. Method for producing a hollow support from a fibre composite material according to claim 1 , wherein the preparation of the moulded body comprises
the depositing of sheets made of a woven fabric or an unidirectional non-crimp fabric pre-finished by impregnation with the soluble matrix material;
or
the depositing of unimpregnated woven fabric or an unidirectional unimpregnated non-crimp fabric and the impregnation in layers with the soluble matrix material.

4. Method for producing a hollow support from a fibre composite material according to claim 1 , wherein the matrix material of the moulded body is soluble in water.

5. Method for producing a hollow support from a fibre composite material according to claim 4 , wherein the matrix material of the moulded body is polyvinyl alcohol (PVA).

6. Method for producing a hollow support from a fibre composite material according to claim 1 , wherein the vacuum setup comprises at least one layer consisting of a vacuum film.

7. Method for producing a hollow support from a fibre composite material according to claim 1 , wherein the vacuum setup comprises at least one layer consisting of a semi-permeable membrane.

8. Method for producing a hollow support from a fibre composite material according to claim 1 , wherein the reinforcing fibres of the hollow support are deposited in a braided form in method step c).

9. Method for producing a hollow support from a fibre composite material according to claim 2 , wherein the preparation of the moulded body comprises
the depositing of sheets made of a woven fabric or an unidirectional non-crimp fabric pre-finished by impregnation with the soluble matrix material;
or
the depositing of unimpregnated woven fabric or an unidirectional unimpregnated non-crimp fabric and the impregnation in layers with the soluble matrix material.

10. Method for producing a hollow support from a fibre composite material according to claim 2 , wherein the matrix material of the moulded body is soluble in water.

11. Method for producing a hollow support from a fibre composite material according to claim 3 , wherein the matrix material of the moulded body is soluble in water.

12. Method for producing a hollow support from a fibre composite material according to claim 2 , wherein the vacuum setup comprises at least one layer consisting of a vacuum film.

13. Method for producing a hollow support from a fibre composite material according to claim 3 , wherein the vacuum setup comprises at least one layer consisting of a vacuum film.

14. Method for producing a hollow support from a fibre composite material according to claim 4 , wherein the vacuum setup comprises at least one layer consisting of a vacuum film.

15. Method for producing a hollow support from a fibre composite material according to claim 5 , wherein the vacuum setup comprises at least one layer consisting of a vacuum film.

Assignees

• Crrc Qingdao Sifang Co Ltd
• Cg Rail Chinesisch Deutsches Forschungs Und Entw Fuer Bahn Und Verkehrstechnik Dresden Gmbh

Inventors

• Ding Sansan
• Deng Xiaojun
• Liu Yuwen
• Chen Xu
• Dong Li
• Cai Mao
• Zhang Xu
• Hufenbach Werner
• Ulbricht Andreas

Classifications

• B29C70/446 Primary

  Moulding structures having an axis of symmetry or at least one channel, e.g. tubular structures, frames · CPC title

• B29K2829/04

  PVOH, i.e. polyvinyl alcohol (B29K2831/04 takes precedence) · CPC title

• B29K2105/0881

  unidirectional · CPC title

• B29L2031/3064

  Trains · CPC title

• B29K2063/00

  Use of {EP, i.e.} epoxy resins {or derivatives thereof}, as moulding material · CPC title