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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。
Forming with double thin-walled connecting ribs, tendons and thin-walled joints prone to bump defects. Such as improper control, with the bump more obvious bump defects, easily lead to the accumulation of failure. An equal volumetric method of side lapping was proposed to control the lateral lap volume by controlling the starting and stopping offset of nozzle scanning path. A power control technique based on layer height detection technology is proposed to ensure that the morphology of the cladding layer does not deteriorate during the stacking process. The laser direct forming experiment of double-walled thin-walled parts with ribs is completed. The gap between double-walled thin-walled pieces with formed connecting bars is about 2.6mm and the deviation of size is within 5%. The microstructure is dense and uniform with no obvious pores, cracks and other defects. The microhardness is between 640 and 770HV.