Welding and forming method for shell of solid rocket engine

Abstract

The invention discloses a welding and forming method for a shell of a solid rocket engine. The shell is made of 30Cr3 ultrahigh-strength steel in material; a cylindrical section is tempered in advance, and then, a way of power-spinning cold hardening is employed to guarantee that the cylindrical section reaches 48 to 52 HRC (Rockwell hardness) and is not less than 1620 MPa in strength before beingwelded; a front joint and a rear joint are tempered after being roughly turned, and then a butting part and a butting part of the cylindrical section are turned, thus creating a good assembly environment for welding and forming a circumferential weld by an electron beam; the circumferential weld among the front joint, the rear joint and the cylindrical section is welded by adopting a vacuum electron beam, so that a heat affected zone is small, the weld width is narrow, the weld in a tempered state and an overheated zone can be respectively prevented from generating a cold crack and from beingembrittled and softened, and stable and reliable welded joint strength is guaranteed; and after the shell is welded by adopting the vacuum electron beam in the tempered state, structure property doesnot need to be improved through high-temperature quenching, and welding stress is removed only by low-temperature tempering, so that the shell is little in deformation and can be effectively guaranteed in geometric tolerance.

Description

technical field [0001] The invention relates to the technical field of processing and forming of small-diameter solid rocket motors, in particular to a method for welding and forming solid rocket motor shells. Background technique [0002] Air-to-air missiles are generally small-diameter solid rocket motors (including solid ramjet motors), which are hung on fighter-bombers and attack aircraft. Battlefield air interdiction, air strikes, and fixed-point clearance play an important role in combat missions. They are the core factor of the precision strike system in modern warfare and the decisive force that determines the outcome of a local war. [0003] Air-to-air missiles are different from ordinary surface-to-ground and surface-to-air missiles because of their own structure and close integration with aircraft. They are very strict on dimensions and tolerances. The size and diameter difference, straightness, roundness and other shape and position tolerances of the engine casi...

AI Technical Summary

Problems solved by technology

Since the thin-walled engine shell needs to undergo multiple high-temperature heat treatments, there is a large deformation in the thin-walled barrel section and the shape is difficult to correct, so the engine shell does not meet the overall index requirements

Images