大型工件扫描式激光喷丸系统研制

摘要

对大型工件扫描式激光喷丸系统进行研制,主要目的是解决激光喷丸针对大型工件的应用问题以及实现工艺过程中激光光斑质量的良好控制.其主要包含作为激光光源的高能量纳秒激光器模块、对激光光斑的尺寸和形状进行调整控制的光斑调节模块、导引激光进行大幅面扫描的两轴振镜模块以及装夹工件并对工件施加弹性预弯的柔性预应力夹具模块.在此基础上结合激光喷丸的工艺特点进行系统的控制流程规划.对制备的系统样机进行激光喷丸光斑质量控制的试验验证,结果表明,通过基于正交柱面透镜组的光斑调节模块的调整,所形成的光斑基本符合规划的目标参数要求,光斑的尺寸与形状质量可实现良好的控制.%A laser peening scanning system for large workpieces is developed to apply in large workpieces laser peening and to control the laser spots quality in the process. It is composed of a high-energy nanosecond laser as the laser source, a laser spot adjusting part to control the shape and size of the laser spots, a two-axis galvanometer part to guide the scanning laser and a flexible pre-bending fixture to fix and elastically pre-bend the workpiece. Based on the characteristic of laser peening, the control process of the system is designed. An experiment to verify the laser spot quality control abil-ity of the system is conducted. It is concluded that corrected by the laser spot adjusting part based on a pair of orthogonal cylindrical lenses, the laser spots on the workpiece generally meet the proposed demand and their sizes and shapes are well controlled.