METHOD OF MANUFACTURING A C-SHAPED RAIL WITH PROFILED SURFACES

摘要

A method of manufacturing an elongated rail with a C-shaped cross-section transversely of its elongated direction from a sheet metal strip by bending marginal sections along each elongated side edge of the strip at 90.degree. with respect to the surface of the strip. Effecting the bending action by discs. Next using a profiling disc rolling a profiled surface into each of the side edges and then after returning the marginal edges to their original thickness, bending the strip into a Cshaped cross section extending transversely of its elongated direction.