METHOD AND DEVICE OF MAKING A PROFILED BODY OF AT LEAST ONE BAND OF MATERIAL

摘要

Improved method and apparatus for of making a profiled body of at least one band of material which is profiled by a series of successive forming steps by means of pairs of rotating forming tools. At least one directrix is determined on the band for some of the forming steps coinciding with a marked longitudinal edge of the body and subdividing the band into a first and second band area. Swinging the first area about the directrix in a first direction and simultaneously swinging the second area about the directrix in opposite direction to said first direction in order to reduce tensile stress in one of the exterior edges of the bands at the cost of increasement of tensile stress in the other exterior edge.