Combined core mould structure for forming grain of rocket engine and use method thereof

Abstract

The invention discloses a combined core mould structure for forming a grain of a rocket engine and a use method thereof. A plurality of special-shaped notches are formed in the side surface of the grain; the structure comprises a plurality of groups of special-shaped assemblies; the groups of special-shaped assemblies are matched with the special-shaped notches of the grain to form a cylinder; each group of special-shaped block assemblies is provided with a first special-shaped block and a second special-shaped block in the circumferential direction; the first special-shaped block contacts a to-be-formed grain and is a metal piece; the second special-shaped block is located on one side, away from the grain, of the first special-shaped block; the second special-shaped block is made of silicon rubber material; and the size of the thickest part of the first special-shaped block is smaller than the minimum size of a demoulding opening in the forming of the grain of the rocket engine; the structure further comprises a forming rubber sleeve and a positioning transition ring; the end face of the forming rubber sleeve is clamped against the end face of the second special-shaped block; andthe end face of the positioning transition ring is clamped against the end face of the first special-shaped block and the forming rubber sleeve. By adopting the structure and the metho9d, the propellant charge of a small inner bore grain configuration engine can be well adapted, the assembly efficiency is high, the quality is stable, and the reliability is good.

Description

Technical field [0001] The invention belongs to the technical field of rocket engine charge, and in particular relates to a combined core mold structure for rocket engine grain formation and a use method thereof. Background technique [0002] In order to make the solid rocket motor have good internal ballistic performance, a special type of conical groove type and wing column type has appeared in the design of a small engine type. The engine type usually adopts a metal composite core mold to form the surface. The existing metal composite core mold includes wings, connecting pieces, fixed cylinders, cover parts, positioning rings and transition rings. The above-mentioned pieces are spliced ​​to form a complete core mold structure; the metal core molds before charging are reasonably combined in the engine combustion chamber , The connection is a whole, and when demolding, it is divided into blocks and divided into pieces to form a complete medicine structure. For the special-shape...

AI Technical Summary

Problems solved by technology

[0004] In order to meet the requirements of thrust ratio and mass ratio, a special-shaped rocket motor propellant was developed, and its three-dimensional structure is as follows figure 1 As shown, there are multiple special-shaped gaps on the side of the grain. Since the maximum width of the special-shaped block is greater than the maximum demoulding space, it cannot meet the disassembly requirements, resulting in difficulties in mold assembly and subsequent demoulding.

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