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针对激光打孔表面具有再铸层、微裂纹等工艺缺陷,提出了喷射液束电解辅助激光加工复合加工工艺.在对喷射液束中激光加工和喷射液束电解加工进行机理分析的基础上,建立了复合加工模型,研制了专用试验装置后对1Cr18Ni9Ti不锈钢进行打孔试验,采用形貌仪和扫描电子显微镜对试验结果进行了分析.结果表明:喷射液束电解辅助激光加工的小孔形状与加工模型的结果相一致;复合加工中电解对激光打孔入口处的孔壁再铸层由0.031mm减小至0mm,孔底再铸层由0.019mm减小至0.017mm;电解作用能消除激光加工产生的微裂纹,提高激光加工的表面质量.
Aiming at the defects of recast layer and micro-cracks on the laser drilling surface, a combined machining process of jet laser electrolysis and auxiliary laser machining was proposed.Based on the mechanism analysis of laser machining and jet machining, The composite machining model was established and the special test device was used to drill the 1Cr18Ni9Ti stainless steel.The results of the test were analyzed by the profilometer and the scanning electron microscope.The results showed that the shape of the hole assisted by the jet laser electrolysis The results of the processing model are consistent. In the composite processing, the recast layer of the hole wall at the laser drilling entrance is reduced from 0.031mm to 0mm and the recast layer of the bottom hole is reduced from 0.019mm to 0.017mm. The electrolysis can eliminate the laser Machining generated microcracks, improve the surface quality of laser processing.