| 摘要 |
A method and a device for hardening at least one portion of the inner surface (12) of a hole (11) made in a mechanical piece (10) of cast iron of predominantly ferritic matrix, comprising the step of subjecting said portion of the inner surface (12) to the action of a laser beam (100), until it causes the melting of its surface layer. In particular, said method comprises the steps of: projecting the laser beam (100) in axial direction inside the hole of the piece (10); deviating the laser beam (100) through a deviator means (4), so that the same is projected onto the inner surface of the hole itself, causing the melting of a surface layer; rotating the deviator means (4) or the piece (10) with respect to each other, and sliding in axial direction the deviator means (4) or the piece (10) with respect to each other, until the desired portion of the inner surface (12) is subjected to the laser beam (100). |
