Method for pre-embedding metal piece in forming process of composite product
A composite material and forming process technology, which is applied in the field of pre-embedding of metal parts, can solve problems such as interfacial gaps of composite materials, deformation of metal parts, etc., and achieve the effect of feasible operation, compensation of thermal expansion coefficient difference, and simple pre-embedding method
Inactive Publication Date: 2019-04-09
长春长光宇航复合材料有限公司
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Problems solved by technology
[0003] The purpose of the present invention is to provide a pre-embedded method for metal parts in the molding process of composite material products, so as to compensate the difference in thermal expansion coefficient between composite materials and metal parts, and solve the technical problems of deformation of metal parts after high-temperature curing and gaps with composite material interfaces
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Embodiment 1
[0019] Such as figure 1 As shown, it is the form of composite material structural parts commonly used in space cameras in the aerospace field; among them, composite materials are used as the main structure to provide bearing capacity; the surface of metal parts provides assembly interfaces, which require high precision and dimensional stability; Metal parts will produce stress and deformation, which will affect the accuracy of secondary processing, and even make metal parts separate from composite materials;
[0020] The present invention adopts following technical scheme to solve the above problems:
[0021] A method for pre-embedding metal parts in the molding process of composite material products, specifically comprising the following steps:
[0022] Step S1, remove the stress of the metal parts: first process the metal parts, process the upper plane to a flatness of 0.05, and anneal to relieve the stress after processing. Titanium alloys are often used in aerospace, and ...
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The invention discloses a method for pre-embedding a metal piece in the forming process of a composite product. The method comprises the following steps of step S1, stress relieving: conducting annealing heat treatment for the metal piece after processing, and relieving processing stress; step S2, sand blasting: conducting sand blasting for the surface of the metal piece before the forming process, then cleaning the surface so as to increase adhesion between an adhesive and the metal piece; step S3, wrapping with the high-temperature curing adhesive: wrapping the surface, being in contact witha composite materla, of the metal piece; and step S4, curing forming: laying prepreg materials on the metal piece after wrapping with the adhesive and a mould together, controlling mould closing clearance in the preloading process, then conducting mould closing and curing processes, and thus completing product forming. The pre-embedding method uses the surface of the metal piece wrapped by the high-temperature curing adhesive as an elastic layer to compensate the difference of thermal expansion coefficient between the composite material and the metal piece, therefore solving the problems of deformation of the metal piece after high-temperature curing and a gap between the metal piece and the interface of the composite material.
Description
technical field [0001] The invention belongs to the technical field of composite material molding, and in particular relates to a method for pre-embedding metal parts in the molding process of composite material products with pre-embedded metal parts. Background technique [0002] Most composite products use metal parts as the interface for processing and assembly. In the molding process of such composite products, in order to ensure the compact structure of the composite material, improve the bearing capacity, and reduce the assembly connectors, metal parts are often pre-embedded and composite materials are integrally formed. A process method in which metal parts are wrapped by composite materials. However, since composite materials are molded and solidified at high temperatures, the thermal expansion coefficient of metal parts is higher than that of composite materials. After curing is completed and cooled to room temperature, the deformation of metal parts is greater than...
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IPC IPC(8): B29C70/78
CPCB29C70/683B29C70/78
Inventor 商伟辉秦闯邹志伟刘永琪林再文
Owner 长春长光宇航复合材料有限公司