The invention discloses a nondestructive
laser cleaning method and device for the surface of an aluminum
alloy workpiece. The cleaning method comprises the ten steps of fixing a workpiece, determining a cleaning area, planning a flat-topped
laser scanning path, setting parameters of the flat-topped
laser, starting cleaning of the flat-topped laser, planning a scanning path of the
Gaussian laser, setting parameters of the
Gaussian laser, starting cleaning of the
Gaussian laser, judging the cleaning effect and completing cleaning. The cleaning device comprises a
workbench, an
image acquisition device, a flat-top laser, a Gaussian laser and a dynamic focusing optical
system, wherein the
workbench is connected with a
computer control system and can move a platform in a 3D mode. The laser paint removing method has the beneficial effects that under the double-pulse laser action of the flat-top laser and the Gaussian laser, the thermal elastic expansion between the paint layer and the substrate generated by the flat-top laser is larger than the
adhesive force effect between the paint layer and the substrate, the edge of the expanded paint layer is accurately
cut by the Gaussian laser, and the efficient and lossless laser paint removing technology is obtained. And a more efficient, uniform and safe cleaning effect is achieved.