Forming die of sand core assembly for pressure vessel winding

Abstract

The invention belongs to the technical field of composite material forming, and relates to a forming die of a sand core assembly for pressure vessel winding. The forming die is composed of a sand core male die and a sand core female die. Each of the sand core male die and the sand core female die comprises a mandrel (1), a locking nut (2) and a petal die assembly (3), each of the sand core male die and the sand core female die comprises a group of metal rings, and each group of metal rings are composed of an inner metal ring and an outer metal ring. The two groups of the metal rings with different diameters are matched with the petal die assembly to form the female die and the male die with different end face shapes, the end faces of the female die and the male die are matched and overlapped, the size precision after assembly is high, and the problems that in the prior art, a sand core assembly rotates during winding and the size precision is poor during machining are solved. And meanwhile, the manufacturing process is simplified, and the sand core male die and the sand core female die can be formed by matching one set of petal die assembly with the metal rings. The die is suitable for winding formation of a rotary body type composite material shell.

Description

technical field [0001] The invention belongs to the technical field of composite material molding, and in particular relates to a molding die for a sand core assembly used for winding a pressure vessel. Background technique [0002] In recent years, with the development of high-performance fibers, due to their advantages of light weight and high strength, they have been widely used in the field of winding pressure vessel products. At present, the forming molds for pressure vessel winding mainly include metal or wooden flap molds, sand core molds, etc. Compared with metal molds, sand core molds are light in weight and simple in structure, especially for composite pressure vessel products with large aspect ratio. Said that the metal mold structure is relatively complex, and the sand core mold has obvious advantages. At present, the existing sand core molds mostly use such as figure 1 The tooling shown includes the combination of mandrel, lock nut and valve mold. When in use,...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies in the prior art, the present invention provides a molding die for a sand core assembly for winding a pressure vessel, which adopts two sets of metal rings with different diameters to cooperate with the petal mold to form a female mold and a male mold with different end face shapes. The end faces of the female mold and the male mold are matched and overlapped, which solves the problem of poor dimensional accuracy caused by the rotation of the components during winding and the machining process, and simplifies the manufacturing process. The sand core male mold can be realized by using a set of valve molds combined with a metal ring , The forming of the female mold, the mold can be designed and operated easily

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