Processing of sliding surface of iron workpiece to hone cylinder barrels of internal combustion engine by short pulse-laser irradiation for plasma formation, comprises irradiating the sliding surface with the radiation of solid body laser

摘要

The procedure for processing of sliding surface (1) of gray iron workpiece to hone cylinder barrels of internal combustion engine by a short pulse-laser irradiation for plasma formation, comprises irradiating the sliding surface with the radiation of solid body laser with a pulse duration (tau ) of 50-150 ns, energy density of 20-100 mJ/mm 2 and pulse frequency (f p) of 4-15 kHz. The energy density lies in a pulse duration of 50 ns between 30-33 mJ/mm 2 and 100 ns between 40-70 mJ/mm 2. The procedure for processing of sliding surface (1) of gray iron workpiece to hone cylinder barrels of internal combustion engine by a short pulse-laser irradiation for plasma formation, comprises irradiating the sliding surface with the radiation of solid body laser with a pulse duration (tau ) of 50-150 ns, energy density of 20-100 mJ/mm 2 and pulse frequency (f p) of 4-15 kHz. The energy density lies in a pulse duration of 50 ns between 30-33 mJ/mm 2 and 100 ns between 40-70 mJ/mm 2. The laser irradiation is carried out with a neodymium yttrium aluminum garnet laser with a wave length of 1064 nm. The sliding surface is melted in the laser irradiation up to a deep melting in a dimension of 3 mu m and is irradiated in a multiple irradiation by partially overlapping the emerging irradiation spots (3, 4). The offset (a) lies between 3/8 to 5/8 of the irradiation spot radius (d/2) in the solid body laser emerging circular round irradiation spots. The irradiation spot yielding itself in the laser irradiation has a diameter of 1-2 mm. An independent claim is included for a laser irradiating device for processing of sliding surface of gray iron workpiece to hone cylinder barrels of internal combustion engine.