A rapid in-situ forming method for conductive fiber reinforced composites

Abstract

The invention discloses a fast in-situ molding method for a conductive fiber reinforced composite material. The fast in-situ molding method is characterized in that a plurality of metal contacts withpotential differences are arranged on a molding mechanism, the dynamical-transmitted conductive fiber is in sliding or rolling contact with the metal contacts, the conductive fiber produces the electrical loss to generate heat among the multi-stage metal contacts, and according to each stage temperature monitored by sensors, dynamic adjusting and controlling of input electrical energy of each stage is conducted; and the composite material is heated stage by stage to the molding temperature, and the fast in-situ molding is completed. The fast in-situ molding method uses the material conductivity loss as the heat source, an external heat source does not need to be applied, in the extrusion, paving, pulling fiber composite material directional movement molding process, the high-speed heatingfinal in-situ molding of the composite material is achieved, the heat response speed of the composite material is high, fiber heating is uniform, the energy utilization is high, the method can greatlyimprove the quality of the composite material in-situ molding, shorten the manufacturing cycle of the fiber reinforced composite material, and reduce the manufacturing costs.

Description

technical field [0001] The invention relates to a molding method for composite materials, in particular to a rapid in-situ molding method for continuous conductive fiber reinforced composite materials, in particular to a rapid in-situ solidified molding method for conductive fiber reinforced composite materials using electric loss heating. Background technique [0002] Conductive fiber-reinforced composite materials such as carbon fiber-reinforced composite materials have a very high weight ratio in aerospace, automobile, ship and other fields, and have become an indispensable key material in the transportation industry. However, at present, the three-step manufacturing process of "preforming-curing-processing" is still widely used in composite materials, that is, the fiber or fiber prepreg is firstly placed in the mold or cavity through preforming methods such as automatic laying, winding, extrusion, and pultrusion. To form a certain shape, the preformed material is heated,...

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem that the heat-affected zone temperature is not uniform in the in-situ forming method of the existing conductive fiber composite material, the thermal stress of the workpiece is large, and the forming quality is not good, especially the problem that the thermosetting composite material cannot be formed in situ. A rapid in-situ molding method for conductive fiber reinforced composite materials. The method is based on the conductive properties of reinforced fibers. Several metal contacts are set inside and at the end of the molding mechanism to make multi-level electrical contact with the dynamically running conductive fibers. Different potentials are connected to different potentials to form a potential gradient, and the conduction of the conductive fiber itself generates loss Joule heat to heat itself. The multi-level electrical contact is independently coordinated and regulated, and the dynamically running conductive fiber forms a heating temperature gradient for dynamic operation. The forming requirements of the material system, combined with the temperature monitor to accurately monitor the temperature state of each section of the composite material, adaptively adjust the input power at all levels, and obtain the target temperature value and temperature distribution. Realize heat preservation and full curing in the middle, and complete rapid in-situ molding after detaching from the end of the molding mechanism

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