Forming method of 2.5-dimensional weaving revolving solid composite material

Abstract

The invention relates to a forming method of a 2.5-dimensional weaving revolving solid composite material, which belongs to the technical field of manufacturing formation and comprises the following processes of: (1) weaving by using at least four simple weaving square machines by a radioactive yarn adding method; (2) weaving fabric with changed cross section from a smaller end to a larger end and evenly hanging warp yarns in the circumferential direction of weft yarns according to different changes of mould diameters; (3) vertically putting the revolving solid fabric into a mould; (4) injecting glue into multiple channels from bottom to top and monitoring glue injecting pressure in real time for ensuring stable glue injecting loading; (5) judging that the glue is completely injected by glue outlets which is also an observation port; (6) closing the last glue outlet and maintaining the pressure of a mould cavity; and (7) curing and treating. The method and corresponding forming equipment have low cost, simple operation, quick compounding, even injection of glue liquid, adjustable pressure, diversity of resin systems and good product quality.

Description

technical field [0001] The invention relates to a 2.5D (dimension) braided rotary composite material molding method, which includes fabric weaving and composite molding, and belongs to the technical field of manufacturing molding. Background technique [0002] With the wide application of composite materials in the fields of aviation and aerospace, the demand for structural parts of the rotary body is increasing, such as rocket nozzles, throats of jet engines, rocket heads and exhaust pipes and other important parts. [0003] For circular tubular, conical and conical rotary fabrics, it can be realized by three-dimensional weaving and three-dimensional weaving. At present, the technology of weaving rotary three-dimensional fabrics by three-dimensional weaving method is mainly the "automatic weaving machine" equipment invented by French Brocher in 1972, and the design and installation of BR900 and BR2000 automatic equipment were completed in 1986 . The weaving principle is t...

AI Technical Summary

Problems solved by technology

[0006] The outstanding feature of three-dimensional weaving technology in technology is that it can directly weave composite prefabricated parts according to the shape and size of parts. However, because its weaving is limited by the size of the weaving machine, most industrial weaving machines can only produce small cross-sections at present. (Width less than 100mm) prefabricated parts, and the supporting equipment occupies a large area and the cost is high

However, the RTM process also has the following shortcomings: 1. The traditional RTM molding process requires a series of supporting equipment to support it, including injection systems, electric heaters, steel molds, hydraulic presses, temperature control systems, vacuum pumps, pressure vessels, etc. , The whole set of RTM equipment has high supporting costs, large floor area, and difficult maintenance; 2. Because the resin mixture produces a chemical reaction after being mixed in the pump, the glue solidifies after the injection is completed and the mixing head is scrapped, and the cost of frequent replacement is high; 3. Difficulty in mold sealing (see the literature "On the Limitations of RTM Technology Promotion" FRP / composite materials Zhai Jiye et al. 1997, (4): 38); 4. The fiber volume content of the product is low, and the resin flow in the mold cavity with a large area and complex structure is not good. Equilibrium, bubble defects are not easy to exclude, etc. (For details, see the literature "Research Status of RTM Technology at Home and Abroad" FRP / Composite Materials Duan Huajun et al. 2000, (5): 46)

The shortcoming of RFI process has following several: 1, because RFI process is too strict to resin system requirement, the resin quantity that meets RFI process is very few, thereby has limited the development of RFI process (see literature " resin film infiltration process (RFI) ) Research Status of Fiber Composite Materials Wang Dong, Liang Guozheng 2000, 35(3): 11-14; "Resin Film Infiltration Process and Numerical Analysis Method" FRP / Composite Materials Yan Shilin, Yang Mei, Tan Hua 2004(2 ): 33-35); 2. The RFI process is not suitable for forming small parts with complex shapes, such as rotary structures

Because the rotary fabric is attached to the mandrel of the rotary mold during the weaving process, the resin film cannot be embedded between the mold and the preform, so that it cannot be ensured that the resin wets the fabric along the thickness direction of the rotary after heating and melting; 3. The amount of resin used in the RFI process cannot be accurate, and materials such as absorbent cloths need to be used to absorb excess resin. There is a certain amount of waste and the process is complicated

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