| 摘要 |
PURPOSE:To finish a bore in almost fixed cylindricity, by honing again a bore part in a cylinder block, previously ground by an internal cylindrical grinding machine, and a bore part excepting the former said bore part. CONSTITUTION:Of the bore surface 2 in a cylinder block 1 of an internal-combustion engine, a bore surface part, in which wearing resistance is required from a part in the vicinity of the piston top dead center suitably to a bottom position, forms a laser hardened part 12 by moving irradiation of a laser beam. Next the bore surface part, swollen by this laser hardening, is ground by an internal diameter grinding machine. Thereafter, the surface in the ground part and the other bore surface are smoothed by bonding work. In this way, a hard composition part to be ground by the honing work can be decreased to a small amount by previously grinding the part by the internal diameter grinding machine. |
