Abstract
In this experimental investigation the laser surface
texturing of tool steel of type 90MnCrV8 has been
conducted. The 5-axis highly dynamic laser precision
machining centre Lasertec 80 Shape equipped with the
nano-second pulsed ytterbium fibre laser and CNC system
Siemens 840 D was used. The planar and spherical surfaces
first prepared by turning have been textured. The
regular array of spherical and ellipsoidal dimples with
a different dimensions and different surface density has
been created. Laser surface texturing has been realized under
different combinations of process parameters: pulse
frequency, pulse energy and laser beam scanning speed.
The morphological characterization of ablated surfaces
has been performed using scanning electron microscopy
(SEM) technique.
The results show limited possibility of ns pulse fibre laser
application to generate different surface structures for tribological
modification of metallic materials. These structures
were obtained by varying the processing conditions
between surface ablation, to surface remelting. In all cases
the areas of molten material and re-cast layers were observed
on the bottom and walls of the dimples. Beside the
influence of laser beam parameters on the machined surface
quality during laser machining of regular hemispherical
and elipsoidal dimple texture on parabolic and hemispherical
surfaces has been studied.
Laser surface texturing of tool steel: textured surfaces quality evaluation
