METHOD OF MAKING BENT CORRUGATED SECTIONS Russian patent published in 1997 - IPC

FIELD: plastic metal working, namely production of bent corrugated sections. SUBSTANCE: method comprises steps of preliminarily bending sheet blank along arc of circle, then simultaneously along the whole cross section forming corrugations by bending and smoothly lowering curvature of blank. Corrugation is realized by two stages. At first stage corrugations with rounded apices are made by pushing blank through non-driven rollers arranged along arc-shaped guides. At second stage members of section are subjected to upsetting for receiving their necessary configuration. EFFECT: enlarged manufacturing possibilities of method, enhanced quality of sections due to their rectilinearity and dimension stability. 2 dwg