| 摘要 |
A sliding surface 4A of a shoe 4 undergoes laser radiation in a shape of a large number of parallel lines to form a large number of swollen portions 6 and to form concave portions 7 in adjacent positions thereof. The swollen portions 6 and the inner side thereof become direct hardening portions 11 with high hardness and the concave portions 7 and the inner side thereof become double hardening portions 12, which are lower in hardness than the swollen portions 6. After the laser hardening, the sliding surface 4A undergoes wrapping up to a position of an imaginary line 15 to delete relief to form a flat and smooth plane. Thereafter the sliding surface 4A undergoes buffing. Thereby, portions with low hardness are chipped off more largely than portions with high hardness to form a large number of minute irregularities on the sliding surface 4A (see Figure 6). A large number of minute irregularities is formed uniformly on the sliding surface 4A of the shoe 4 and lubrication oil will be introduced thereinto. Therefore, a shoe 4 excellent in seizing resistant property can be provided. |
