METHOD FOR MAKING ARTICLES WITH TRAPEZOIDAL ANNULAR CORRUGATIONS Russian patent published in 2001 - IPC

FIELD: machine engineering, aerospace technology, namely manufacture of bellows, flexible metallic hoses, high pressure hoses, draining tubes and so on. SUBSTANCE: tubular blank is placed between cylindrical surfaces of holder and sleeve. Opposite surfaces of holder and sleeve have such profiles that total thickness of wall of semifinished product is constant in radial direction. When outer protrusions of holder are pressed into respective inner recesses of sleeve, deformed layers of semifinished product are deformed by shear relative to its non-deformed layers. It provides reshaping of holder and sleeve together with tubular blank for making product with annular corrugations. Product is separated from holder and sleeve after shaping by melting them in bath of boiling water. EFFECT: enhanced quality of product due to elimination of wall thinning, lowered labor consumption. 8 dwg