Mould and method for forming partial special-shape surface of large composite material workpiece in autoclave

Abstract

The invention belongs to a composite material thermal forming technology, and particularly relates to a mould and a method for forming a partial special-shape surface of a large composite material workpiece in an autoclave. The mould is characterized in that a mould mode of a main body male die and special-shape position partial female and male die match is adopted for forming the large composite material special-shape workpiece in the autoclave. The main body male die is adopted, so that the forming precision of the inner surface of the workpiece is ensured, and the inner surface of the workpiece is applicable to internal bonding; for a partial special-shape position of the outer surface of the workpiece, the female and male die match is adopted, so that the size and the position precision of a special-shape moulding surface at an assembling part of the outer surface of the special-shape workpiece are ensured, and the internal quality of the workpiece can be ensured.

Description

technical field [0001] The invention belongs to the thermoforming technology of composite materials, and in particular relates to a mold and a method for forming an autoclave with a local special-shaped surface of a large composite material part. Background technique [0002] The autoclave forming method is the most commonly used composite forming method. In autoclave molding, the tooling mold requirements are relatively simple, and the equipment has good versatility, which is especially suitable for the molding of large parts over 3m. In the autoclave molding method, the air is used for pressurization, and the air is used as the flow carrier of heat conduction. When the mold design is reasonable, the pressure and heat can be transferred evenly. In order to ensure the internal quality of the part, one surface of the part is generally used as the die surface in autoclave forming, and the precision of the die surface after curing is relatively high. [0003] The inner surfac...

AI Technical Summary

Problems solved by technology

When the inner surface is single-sided with film, when the autoclave vacuum bag forms a special-shaped surface, the quality and position accuracy control of the outer surface completely depends on the laying accuracy of the prepreg, and it is impossible to form a special-shaped surface with an angle on the local surface, such as figure 1 As shown, the assembly requirements cannot be met, so it is necessary to adopt new molding methods and processes to complete the special-shaped surface molding of the assembly connection parts

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