Method for assisting in forming composite material propeller blade by using air bag inflation

Abstract

The invention discloses a method for assisting in forming a composite material propeller blade by using air bag inflation. A flexible air bag is adopted to perform inflation manufacturing on a skin shell of the propeller blade, and then a foaming process is adopted to manufacture an internal core material. The method specifically comprises the steps of carrying out forming tool design, carrying out skin prepreg laying, placing flexible air bag, carrying out die assembly installation, carrying out inflation curing, carrying out inner core filling and the like. According to the method, the pressure applied by compressed air can be uniformly and accurately transmitted, the thickness uniformity of a skin structure is guaranteed, meanwhile, the internal quality of the skin is guaranteed, and the problem of sandwich pressure loss or insufficient filling in a die pressing process is avoided; and compared with a die pressing and autoclave process, the method has the advantages that the operation is simple, the equipment cost is relatively low, and the method can be used for large-batch manufacturing. In addition, the flexible air bag used in the method can be repeatedly used, the materialsare easy to purchase, the manufacturing process is simple, the production cost is effectively reduced, and the manufacturing period is effectively shortened.

Description

technical field [0001] The invention relates to a method for forming propeller blades of composite materials aided by air bag inflation. Background technique [0002] Resin-based carbon fiber composite materials have superior properties such as specific strength and specific stiffness, strong designability, good fatigue fracture resistance, corrosion resistance, and good dimensional stability. They are currently widely used in aviation, aerospace, transportation and other fields. High-performance structural materials. With the development of composite material technology and the outstanding performance of its mechanical properties, the design and use of composite materials in propeller blades has received widespread attention. Since the 1960s, various countries in the world have begun to use various composite materials for propeller blades. At present, almost all advanced propeller-bladed aircraft developed are made of composite materials. [0003] The propeller blade stru...

AI Technical Summary

Problems solved by technology

This process mainly has the following three disadvantages: (1) The molding process is mainly transferred to the surface of the mold by means of the press equipment, and then the cavity is controlled by the pressing force of the mold. It has very high requirements for the filling and mold matching. Or if the pressure transmission is not in place, it is easy to cause problems such as poor glue, delamination, and fiber wrinkles in the product

(2) The heating method of the molding process mainly relies on the upper and lower dies of the mold to transfer heat, and there is a problem of uneven heat conduction, which leads to inconsistent heating rates between the surface and the interior of the part, thus affecting the internal molding quality of the part

(3) The molding dies of the molding process are generally made of steel materials, which require high precision, so the manufacturing and maintenance costs are extremely high, and the manufacturing cycle for repair or reprocessing is also long

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