双面堆积对电弧增材制造直壁件变形及应力的影响  

Effect of double-sided deposition on deformation and stress of wire arc additive manufacturing wall parts

作　　者：周祥曼[1] 秦敬平 田启华[1] 杜义贤[1] 付君健[1] Zhou Xiangman;Qin Jingping;Tian Qihua;Du Yixian;Fu Junjian(China Three Gorges University,Yichang 443002,Hubei,China)

机构地区：[1]三峡大学,湖北宜昌443002

出　　处：《焊接》2021年第12期24-28,35,64,I0009,共8页Welding & Joining

基　　金：国家自然科学基金资助项目(51705287,51775308)。

摘　　要：针对传统电弧增材制造单面堆积所导致单向热累积问题,文中提出采用双面堆积的策略,即在基板的两面交替堆积相同的材料来平衡传统单面堆积的单向热输入产生的围绕成形件中性轴的较大的弯矩,从而减小单面堆积成形件的单向翘曲变形,并通过单道4层直壁零件的单面堆积和双面堆积的热力耦合数值仿真和对应的试验进行验证。研究结果表明,双面堆积策略可有效减小基板和直壁件的翘曲变形,改善成形件残余应力分布,从而验证了所提出策略的有效性。文中的研究结论可以为电弧增材"形、性"并行的调控提供理论依据和参考。Aiming at the problem of unidirectional heat accumulation caused by unidirectional stacking in conventional wire arc additive manufacturing(WAAM),a double-sided deposition strategy was proposed in this paper,namely the same material was alternately deposited on both sides of the substrate to balance the larger bending moment around the neutral axis of the formed part generated by the unidirectional heat input of the traditional single-sided deposition,so as to reduce the large deformation and residual stress of single-sided deposited parts.The above strategy was verified by thermal-mechanical coupling numerical simulation and corresponding experiments of single-sided and double-sided deposition of single-pass four-layer wall parts.The result showed that double-sided deposition could effectively reduce deformation of substrate and parts,improve the residual stress distribution of wall parts,which could verify the effectiveness of the proposed strategy.The conclusion in this paper could provide theoretical basis and reference for the parallel control of“shape and performance”in WAAM.

关 键 词：电弧增材制造 直壁件 双面堆积策略 变形 应力 

分 类 号：TG444[金属学及工艺—焊接]