Patent ID: 8316683

Claim:
A method of manufacturing a product using a bending method which carries out bending downstream of a support means while feeding a metal material to be worked with a feed device from an upstream side to a downstream side and supporting the metal material in co-ordination with movement of the metal material with the support means to manufacture a product intermittently or continuously having a bent portion which is bent two-dimensionally or three-dimensionally and a quenched portion in the lengthwise direction and/or the circumferential direction in a plane crossing the lengthwise direction, characterized by locally heating a portion of the fed metal material to a temperature range in which quenching is possible with a heating means for the metal material downstream of the support means and spraying a cooling medium towards the portion of the metal material heated by the heating means with a cooling means disposed downstream of the heating means to quench at least a portion of the metal material, performing bending of the metal material which is fed in the axial direction by imparting a bending moment to the portion of the metal material which was heated by the heating means by two-dimensionally or three-dimensionally varying the position of a movable roller die which was disposed downstream of the cooling means and which had a plurality of rolls which can feed the metal material which was heated by the heating means in the axial direction, and suppressing errors in the formed product resulting from the bending by supporting a portion of the metal material which has passed through the movable roller die.