| 摘要 |
PURPOSE:To form a cam surface having desired depth of chill and high shape accuracy, by irradiating the surface of a cam part in which guide plates having normal cam profiles are provided to both side faces, respectively, with high- density energy heat and by carrying out chill forming by means of a pressure jig guided by the above guide plates. CONSTITUTION:A camshaft stock 1 is formed by casting into the prescribed shape, and a pair of guide plates 12 is stuck to both side faces of the cam part 10. The guide plates are composed of steel plates which previously have normal cam-profile shapes and in which through holes 12a are formed according to the diameter of the shaft 1, which are cast integrally with the stock 1 at the time of casting the stock 1. The cam surface 11 of the stock 1 supported and rotated in an A direction is remelted by means of a laser beam 21 applied from a laser beam machine 2, and the remelted zone is subjected to chill forming by means of a pressure roller 3 provided to the position right after the laser-irradiated zone and guided by respective peripheries of the guide plates 12. |
