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Preforms made directly from thermosetting composite chips

A prefabricated, thermosetting technology used in the field of compression molding of molding materials to solve problems such as unpredictability and different morphologies

Active Publication Date: 2018-01-26
HEXCEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the motion of random fibers during high-pressure molding is variable, unpredictable for each molded part, and different for different topologies of a given part

Method used

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  • Preforms made directly from thermosetting composite chips
  • Preforms made directly from thermosetting composite chips
  • Preforms made directly from thermosetting composite chips

Examples

Experimental program
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Embodiment Construction

[0020] The invention includes the use of a composite sheet in a method for forming a preform directly from the composite sheet. The composite flakes used as feedstock were of the same or similar type as UD flakes commonly used to make DFC sheet molding compounds. Such UD flakes comprise UD fiber tows and an uncured thermosetting resin as a matrix. Any UD sheet suitable for making DFC sheet molding compounds such as It can also be used as a composite sheet that is produced directly into a preform using the method of the invention.

[0021] Exemplary methods are shown in figure 1 . An initial step 10 involves preparing a non-agglomerated composite sheet 16 . Non-coalesced composite sheets 16 each include fibers and an uncured thermosetting resin. The non-coalesced composite sheet 16 is maintained at a temperature such that the tack of the uncured thermosetting resin is low enough to prevent the composite sheet from coalescing. A plurality of parallel UD tapes 12 formed by...

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Abstract

Preforms made by molding composite chips (16) that are composed of fibers and an uncured thermosetting resin. Cold composite chips are formed into a stream of non-agglomerating chips that is used to fill the cavity (26) of a preform tool (22). The non-agglomerating chips flow into the preform tool cavity (26) to form a population of non-cohesive composite chips. The non-cohesive composite chips are then heated to form a preform made up of a consolidated population of cohesive composite chips in which the non-sticky uncured thermosetting resin of the non-cohesive chips has been converted to a sticky uncured thermosetting resin.

Description

technical field [0001] The present invention relates generally to the field of compression molding using molding materials consisting of composite chips comprising unidirectional fibers and a tacky thermosetting resin matrix. More particularly, the present invention provides an alternative to the type of compression molding in which the inherent cohesiveness of the composite sheet is used to form a self-cohesive sheet of molding material which is cut and / or folded to form what is commonly referred to as Self-cohesive self-stereotype of "prefab". Typically, multiple layers of sheet molding material are used to make a single preform. A preform whose shape matches the final shape of the desired part is cured in a compression mold to form the final product. Background technique [0002] Pre-impregnated composite materials (prepregs) are widely used in the manufacture of composite parts and structures. A prepreg is a combination of an uncured resin matrix and fiber reinforceme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29B11/16
CPCB29B11/16B29C43/02
Inventor B·布尔西耶
Owner HEXCEL
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