Patent ID: 9120143
Filing Date: 2015-09-01
Classification: B21F,B21J,B21K

Abstract:
1. A method of improving the surface finish of a sheared end face of a cylindrical blank in a progressive forming machine comprising the steps, all performed in the forming machine, of shearing the blank from wire or bar stock across a plane transverse to a longitudinal axis of the blank, deforming a full end face of the cylindrical blank out of an original as sheared transverse plane into a first shallow cone shape concentric with the longitudinal axis of the cylindrical blank that departs from the original as sheared transverse plane a distance that increases with proximity to the longitudinal axis of the cylindrical blank, thereafter in the next forming step on said full end face deforming the first shallow cone shape of the end face into a second shallow cone shape in a direction opposite a direction the first shallow cone shape was displaced from the original as sheared transverse plane, the second shallow cone shape departing from a transverse plane a distance that increases with proximity to the longitudinal axis of the blank.