The invention discloses an additive manufacturing
metal surface strengthening method based on
laser shock
peening. The additive manufacturing
metal surface strengthening method aims to solve the problems of energy utilization, the
lap joint effect, the influence depth of
residual compressive stress and the like which commonly exist in the
laser shock
peening process. The additive manufacturing
metal surface strengthening method comprises the steps that firstly, the metal surface manufactured through additive manufacturing is pretreated, and then
laser shock
peening machining is conducted;
simulation treatment and analysis are conducted on the laser shock peening process, the optimal distribution proportion and the
light spot lap joint rate of a pulse 1 and a pulse 2 are determined, and the proper mounting positions of a focusing lens and a reflector 2 are adjusted correspondingly; and then a high-energy pulse 1 conducts point-by-point
machining strengthening on a to-be-strengthened area, meanwhile, a low-energy pulse 2 conducts pre-
machining on a next point-by-point machining area, then a metal target moves by one
station, and laser shock peening is conducted again till strengthening machining is completed. According to the additive manufacturing metal surface strengthening method, under the condition that parameters of a laser device are not changed, laser
pulse energy is fully utilized, and the laser shock peening effect is comprehensively improved.