带连接筋双层薄壁件激光直接成形工艺  

Laser Direct Forming Technology of Double Thin-Walled Parts with Connecting Ribs

作　　者：方琴琴[1] 傅戈雁[1] 王聪[1] 陆斌[1] 周斌[1] 

机构地区：[1]苏州大学机电工程学院,江苏苏州215021

出　　处：《中国激光》2017年第2期248-256,共9页Chinese Journal of Lasers

基　　金：国家重点研发计划(2016YFB1100300);国家自然科学基金(51675359);江苏省重点研发项目(BE2015067)

摘　　要：成形带连接筋双层薄壁件时,筋与薄壁连接处易产生凹凸缺陷。如控制不当,随着堆积的进行凹凸缺陷愈加明显,易导致堆积失败。提出等体积法侧向搭接工艺,通过控制喷头扫描路径中起、停偏移量控制侧向搭接量,从而获得了熔覆形貌平整的筋、壁相贯连接面。提出基于层高检测技术的功率控制工艺来保证堆积过程中熔覆层形貌不失稳,完成了带筋双层薄壁件激光直接成形实验。成形的带连接筋双层薄壁件间隙约为2.6mm,尺寸偏差在5%以内;显微组织致密均匀,无明显的气孔、裂纹等缺陷,显微硬度在640~770HV之间。When double thin-walled parts with connecting ribs are formed, the bump defects are easy to occur in the connection between ribs and thin walls. The bump defects will be more obvious with the accumulation if the control is improper, and it is easy to lead to accumulation failures. We propose a lateral lap process by equal volume method, which can obtain intersecting surfaces of ribs and walls with flat cladding morphology by controlling the starting and stopping offset in the nozzle scan path to control the lateral overlap. We also propose a power control technology based on the height detection technique to ensure that the morphology of the cladding layer in the accumulation process remains stable until the laser direct forming of the double thin-walled parts with connecting ribs is completed. The gap of the formed double thin-walled parts with connecting ribs is about 2.6 mm, and the size deviation is less than 5 %. The microstructure is dense and uniform, without obvious holes, cracks and other defects, and the microhardness is 650-770 HV.

关 键 词：激光技术 激光直接成形 侧向搭接 等体积法 功率控制 双层薄壁件 

分 类 号：TN249[电子电信—物理电子学]