Method of producing bodies of revolution

Abstract From the Canadian patent

A rotation body having different diameters along the length thereof is produced by: a) rotating a blank about the longitudinal axis thereof and working the rotating blank between two pressure zones to apply thereto a local pressure exceeding the flow limit of the blank material whereby circularly extending impressions of different diameters are worked into the blank, the pressure zones crossing each other; b) displacing the pressure zones relative to each other while applying the local pressure one, of the pressure zones being displaced in a direction at an angle to its longitudinal extension and to the longitudinal direction of the pressure zone it crosses and the points of crossing of the …