MANUFACTURING METHOD FOR CYLINDER BLOCK, AND CYLINDER BLOCK

摘要

A sprayed coating film (5) is formed using a thermal spray gun (7) on the inside surface of cylinder bores (3) of a cylinder block (1). The thermal spray gun (7) moves back and forth in the axial direction within the cylinder bore (3) while rotating and sprays from a nozzle part (9) at the tip thereof molten droplets (10) for which an iron based material wire has been melted. At this time, the rate of movement in the axial direction of the thermal spray gun (7) within the cylinder bore (3) is increased to a prescribed value or greater, and the number of back-and-forth movements in the axial direction of the thermal spray gun (7) within the cylinder bore (3) is increased to a prescribed value or greater.