FIELD: metal pressure shaping. SUBSTANCE: method includes form shaping of intermediate roll- formed shape having flat wall and longitudinal stretching of the latter prior to shaping of transverse corrugations by making undulations in the longitudinal section with the length of the shape being constant. During the longitudinal stretching of the flat wall are produced at least two rows of alternately formed transverse undulations, which are lengthwise displaced relative each another. EFFECT: improved production method. 10 cl, 10 dwg
Authors
Dates
1994-01-30—Published
1992-03-25—Filed