A metal mandrel structure for solid rocket motor casing molding

Abstract

The invention discloses a metal core mold structure for forming a solid rocket engine casing. The metal core mold structure is composed of a large end hook disk, a small end hook disk, a joint gland,a positioning ring, a small end curved surface part, a core mold sectioning mold and a core shaft. The appearance curved surface of the core mold sectioning mold is divided into a plurality of mold sections in the ring direction, and one mold section is a small component and is used for disassembling and assembling the core mold sectioning mold; thin sheets at the two ends of each sectioning moldare both provided with inwards-convex trapezoidal bosses, the inner annular surfaces of the bosses are matched with corresponding inner annular grooves of the large end hook disk and the small end hook disk so as to be used for ensuring the dimensional accuracy of the outer molded surface of a core mold; the two sides of each sectioning mold are provided with reinforced ribs so as to be used for ensuring the radial rigidity in the winding process; perpendicularly-downwards vertical faces are arranged at the two ends of each sectioning mold so that a small end joint can be matched with the small end curved surface part; and a positioning ring is embedded into the large end hook disk, so that the annular inner surface of the mall end hook disk is in tight fit with a core shaft. The core moldstructure has the characteristics of being convenient to disassembly and assembly, high in positioning accuracy and long in service life.

Description

technical field [0001] The invention relates to the manufacturing technology of solid rocket motor shells, in particular to a reusable metal mandrel for solid rocket motor fiber wound shells. Background technique [0002] The shell structure of the solid rocket motor is the most important part of the negative mass of the motor, which has a great influence on the thrust-to-weight ratio of the motor. Due to its high specific strength, large specific modulus, corrosion resistance and other excellent properties, carbon fiber composites are widely used in the field of solid rocket motors, thereby significantly improving the performance of solid rocket motors. As the basis and necessary step of winding process design, the forming of core mold is an important link. The quality and precision of the core mold directly affect the subsequent winding, curing, demoulding and machining processes. [0003] Since the 1960s, core mold technology has gone through three stages: full plaster ...

AI Technical Summary

Problems solved by technology

[0004] In order to avoid the deficiencies in the prior art and to overcome the time-consuming and labor-intensive disassembly and assembly of metal mandrels and metal skeleton gypsum mandrels, and the difficulty of ensuring accuracy, the present invention proposes a metal mandrel structure for solid rocket motor shell molding ;By embedding a high-precision complete ring in the relevant structural parts to ensure that the mandrel has a high radial dimension accuracy after assembly, so as to meet the actual engineering production needs

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