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单道多层电弧增材制造成形控制理论分析
张金田, 王杏华, 王涛
中国船舶重工集团公司第七二五研究所, 洛阳 471023
摘要:
文中采用冷金属过渡(CMT)技术,围绕船用高强钢的电弧增材制造(WAAM)开展研究. 分析不同比例的保护气体对单道单层形貌尺寸的影响. 结果表明,单道单层的润湿铺展能力随着保护气中CO2含量的增加而提高,并建立了能够准确预测80%Ar + 20%CO2混合气体保护下单道单层截面轮廓的全周期余弦函数模型. 依据单道多层电弧增材的成形特点,利用面积关系并根据几何形貌建立了单道多层抬升量h的预测模型,抬升量h预测值的相对误差不超过3.50%. 通过建立抬升量预测模型,为单道多层的电弧增材成形控制提供了理论支撑.
关键词:  冷金属过渡  电弧增材制造  单道单层  单道多层
DOI:10.12073/j.hjxb.2019400314
分类号:TG456.4
基金项目:科技部重点研发计划资助项目(2018YFB1105802)
Research on forming control for single-pass multi-layer of WAAM
ZHANG Jintian, WANG Xinghua, WANG Tao
Luoyang Ship Material Research Institute, Luoyang 471023, China
Abstract:
The wire & arc additive manufacturing (WAAM) of cold metal transfer (CMT) for high-strength marine steel was studied. By analyzing the influence of different proportion of shielding gas on the morphology of single-pass single-layer, the results showed that the wetting capacity of single-pass single-layer increases with the increase of CO2 in the shielding gas. And a full-period cosine function prediction model was established, which could accurately predict the section profile of single-pass single-layer under 80% Ar + 20% CO2 shielding gas. According to the forming characteristics of single-pass multi-layer, a prediction model for single-pass multi-layer uplift distance h was established based on the area relationship and geometric morphology. The relative error of the predicted value of uplift distance h was less than 3.50%. By establishing the uplift distance model, it provided theoretical support for single-pass multi-layer of wire & arc additive manufacturing.
Key words:  cold metal transfer  wire & arc additive manufacturing  single-pass single-layer  single-pass multi-layer