Method for forming a crankshaft
AssigneeHonda Giken Kogyo Kabushiki Kaisha
InventorsShyoichi Ando, Shuichi Yamane, Yoshihisa Doi, Hisayuki Sakurai, Haruo Meguro
Life of this patent
Estimating the term…
Abstract
A shaped metallic article such as a crankshaft is produced from a hollow pipe which is commercially available. The hollow pipe, which has a predetermined wall thickness, is squeezed into a hollow blank pipe having a predetermined shape and wall thickness. A region of the hollow blank pipe is then heated, and the heated region is upset and bent into a crankshaft, for example. The hollow blank pipe is upset and bent by dies positioned one on each side of the gripped portion of the blank and moving toward each other, and also by punches. After the crankshaft is forged, one of the punches is released from the crankshaft before the dies are separated therefrom.
Claims7
A method of forming a shaped metallic article, comprising the steps of:
- gripping a portion of an elongate blank with a pair of punches with terminal ends of the gripped portion extending on either side of the pair of punches;
- upsetting and bending the blank with dies positioned one on each side of the gripped portion of the blank by moving toward each other into engagement with the terminal ends of the blank, and with said punches, thereby forming an elongate article into a crankshaft having journals;
- and
- thereafter, rolling said journals of the elongate article to correct the same out of a bent configuration.
Dependencies are inferred from the claim text.