纵向磁场对铝合金电弧熔敷成形表面精度的影响
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摘要
为提高电弧增材制造成形精度,研究纵向磁场作用下铝合金电弧熔敷增材成形工艺,考察不同函数近似表征成形焊道截面轮廓,分析纵向磁场对焊道外形尺寸、润湿角的影响以及提高熔敷层成形精度的作用。结果表明:抛物线和正弦曲线能较好地表征成形焊道截面轮廓,电弧增材成形过程加入纵向磁场后,随着励磁电流的增加,焊道余高减小,熔宽增大,润湿角逐渐减小,熔敷层平整度提高;当励磁电流为25 A时,表面平整度最高,成形精度最优。
In order to improve the forming accuracy of additive manufacturing based arc, the forming process of additive manufacturing based arc under longitudinal magnetic field was studied. Accuracy of weld bead profile characterized approximatively by different functions was investigated. The influence of longitudinal magnetic field on the welding dimension and wetting angle and improving forming precision was analyzed. The results show that parabolic and sinusoidal curves can better characterize the profile of weld. When the longitudinal magnetic field is introduced into the forming process of additive manufacturing based arc,as excitation current increases,the weld reinforcement decreases,the width of weld bead increases,the wetting angle decreases and the smoothness of deposit layer increases. When the excitation current is 25 A,the aluminum alloy can obtain the highest surface flatness and best forming accuraly.
In order to improve the forming accuracy of additive manufacturing based arc, the forming process of additive manufacturing based arc under longitudinal magnetic field was studied. Accuracy of weld bead profile characterized approximatively by different functions was investigated. The influence of longitudinal magnetic field on the welding dimension and wetting angle and improving forming precision was analyzed. The results show that parabolic and sinusoidal curves can better characterize the profile of weld. When the longitudinal magnetic field is introduced into the forming process of additive manufacturing based arc,as excitation current increases,the weld reinforcement decreases,the width of weld bead increases,the wetting angle decreases and the smoothness of deposit layer increases. When the excitation current is 25 A,the aluminum alloy can obtain the highest surface flatness and best forming accuraly.
引文
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[2]王启伟,朱胜,陈春良,等.能束能场增材再制造技术的研究进展[J].中国表面工程,2018,31(6):1-8.
[3]何智,胡洋,曲宏韬,等.超声冲击电弧增材制造钛合金零件的各向异性研究[J].航天制造技术,2016(6):11-16.
[4]孙汝剑,朱颖,李刘合,等.激光冲击强化对电弧增材2319铝合金微观组织及残余应力的影响[J].激光与光电子学进展,2018,55(1):135-141.
[5]ZHU S,WANG Qiwei,YIN F L,et al. Influence of alternative magnetic field frequency on microstructure and properties of surfacing welding layer of aluminum alloy[J]. Materials Science Forum,2011,697/698:351-355.
[6]LUIS PEREZ C J,VIVANCOS CALVET J,SEBASTIAN PEREZ M A. Geometric roughness analysis in solidfree form manufacturing processes[J]. Journal of Materials Processing Technology,2001,119(1/2/3):52-57.
[7]AIYITI Wurikaixi,ZHAO Wanhua,TANG Yiping,et al. Study on the process parameters of MPAW based rapid prototyping[J]. Key Engineering Materials,2007,353/354/355/356/357/358:1931-1934.
[8]曹勇,朱胜,孙磊,等.基于小波变换的MAG快速成形焊缝截面建模[J].焊接学报,2008,29(12):29-32.
[9]孟凡军,朱胜,杜文博.基于GMAW堆焊成形的顺序焊道搭接量模型[J].装甲兵工程学院学报,2009,23(6):87-90.
[10]王启伟.外加纵向磁场作用下铝合金焊接熔敷再制造成形基础与应用研究[D].北京:装甲兵工程学院,2012:79-80.