Variable thickness preform, composite component and yarn reduction method of variable thickness preform

Abstract

The invention provides a variable thickness preform, a composite component and a yarn reduction method of a variable thickness preform. The variable thickness preform comprises a main body fiber partwhich is composed of several warp yarns and weft yarns and a drawing part which is formed by withdrawal fibers, getting away from the main body fiber part, of the warp yarns and weft yarns which formthe main body fiber part, the withdrawal part makes the number of fibers of the preform at least in one direction reduced; the withdrawal fibers comprise withdrawal warp yarns and withdrawal weft yarns which are drawn out of the main body fiber part from draw-out points, the withdrawal weft yarns do not comprise the weft yarns located on the outer side of surface layer warp yarn in the drawing outprocess. Therefore, the yarn decoherence phenomenon, caused by yarn reduction, of the preform is avoided, and the integrality of the preform; by optimizing the draw-out point structure movement ruleadjustment, variable thickness profile preform net shaping manufacturing is achieved.

Description

technical field [0001] The invention relates to the technical field of three-dimensional woven composite materials, in particular to a variable-thickness prefabricated body, a composite component and a yarn reduction method for a variable-thickness prefabricated body. Background technique [0002] The reinforcing fibers in the 3D woven preform interweave in space and have good structural integrity. The 3D woven preform is more and more widely used as a composite reinforced structure. In practical engineering applications, the cross-sectional dimensions of some composite parts change, such as the thickness gradually decreases along the length and width directions of the preform weaving; in order to achieve net shape manufacturing, preform preparation usually adopts yarn reduction method to achieve thickness change. [0003] In the yarn reduction process, the weft yarn located behind the withdrawal point is usually subtracted at the withdrawal point to reduce the thickness. W...

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Problems solved by technology

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defect that the preform is prone to loosening during the yarn reduction process in the prior art, thereby providing a variable thickness Preform, a composite component and a yarn reduction method for a variable-thickness preform

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