激光粉末床熔融装备与工艺发展

Development of laser powder bed fusion equipment and processes

  • 摘要: 激光粉末床熔融(laser powder bed fusion,L-PBF)是金属增材制造领域中最重要的技术之一,被广泛应用于航空航天、生物医疗和工业模具等领域。目前,LPBF正朝着大尺寸、高效率、高精度和高性能方向发展。然而,该技术仍面临一些瓶颈,如零件内部缺陷、残余应力以及热历史控制等问题。为了提升LPBF技术的金属零件制造能力,新装备、新工艺不断涌现。文章分析了现阶段LPBF先进装备及工艺技术,包括光束整形技术、多光束分区拼接技术、同幅面多光束复合技术、区域3D打印技术、多材料打印技术和在线监测辅助技术;以及无支撑打印工艺、层间改性工艺、多场辅助成形工艺和机器学习辅助性能预测工艺,总结了LPBF装备与工艺的技术优缺点,并展望LPBF技术的未来发展方向。

     

    Abstract: Laser powder bed fusion (LPBF) is one of the most important technologies in the field of metal additive manufacturing, which is widely applied in aerospace, biomedicine, industrial molds and other fields. Currently, LPBF is developing towards large size, high efficiency, high precision and high performance. However, LPBF still encounters some bottlenecks, such as internal defects, residual stresses, and the control of the thermal history. In order to enhance the manufacturing capabilities of metal parts manufacturing via LPBF, innovative equipment and processes were constantly emerging. The current advanced equipment and processes of LPBF are analyzed, including beam shaping technology, multi-beam partitioned splicing, same format multi-beam composite, regional 3D printing technology, multi-material printing and online monitoring assistance technology, as well as unsupported printing process, inter-layer modification process, multi-field assisted forming process and machine learning-assisted performance prediction process. The technical advantages and disadvantages of LPBF equipment and processes were summarized, and the future development direction of LPBF was predicted.

     

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