Patent ID: 7251979
Filing Date: 2007-08-07
Classification: B21J,B21K

Abstract:
1. A method of producing a forged part, comprising: holding an outer periphery of a material between split jigs; upsetting the material, held by the jigs, to a first predetermined shape with a pair of upsetting dies disposed on both ends of the material by pressing the upsetting dies on the material, wherein a burr is formed on the outer periphery of the material in a clearance (S) defined between the jigs during the upsetting operation; forging the upset material into a second predetermined shape with split forging dies after upsetting, wherein a burr is formed on the outer periphery of the material during the forging operation; and finish-machining the forged material to remove the burr generated on the outer periphery of the material after forging, wherein, when forging, a direction in which the material is forged is set to a forging direction such that a position of the burr formed during the forging operation is the same as a position of the burr formed during the upsetting operation.