The invention discloses a method and a
system for
processing an immersed workpiece by double
laser light. The method includes focusing the
laser light A with the
wavelength of 1064 nm on the surfaces of the workpiece in water and locally
softening the heated workpiece; focusing the
laser light B with the
wavelength of 10640 nm on the water above the workpiece; breaking through the water by the aid of the
laser light B to generate
impact waves, enabling the
impact waves to act on locally softened regions of the surfaces of the workpiece and removing softened materials so as to groove and process the workpiece. A focus point of the
laser light A and a focus point of the
laser light B are distanced from each other by hundreds of micrometers.
Solid for generating the laser light A and the laser light B and a laser head of a CO2
gas laser device of the
system are positioned above a water tank, the center line of
laser beams A is a plumb line, the center line of
laser beams B intersects with the
laser beams A at the focus point of the laser light A on the upper surface of the workpiece, and an intersection angle of the center line of the laser beams B and the laser beams A is 10-30 degrees. The height of a worktable can be adjusted. The thicknesses of water
layers on the surfaces of the workpiece are 1-3 millimeters. Compared with laser melt
cutting processing, the
system and the method have the advantages that the
heating temperature of the laser light A is lower than melting points of the materials, accordingly, influence of local overheating can be reduced, and the quality of machined finished products can be guaranteed.