1 材料及试验步骤
1.1 样品制备
表1 TC4钛合金粉末的化学成分 (%) |
元素 | Al | V | Fe | O | C | N | H | Ti |
---|---|---|---|---|---|---|---|---|
含量 | 6.100 | 4.100 | 0.150 | 0.120 | 0.020 | 0.020 | 0.006 | 89.484 |
杨光(1978-),男,辽宁沈阳人,教授,博士,主要研究方向:航空航天结构增材制造技术,E-mail:yangguang@sau.edu.cn。 |
收稿日期: 2024-05-09
网络出版日期: 2024-12-11
基金资助
国家重点研发计划项目(2022YFB4602202)
辽宁省教育厅项目(LJKQZ20222269)
航空制造工艺数字化国防重点学科实验室项目(SHSYS202250)
Effect on surface quality of selective laser melting of TC4 alloy by ultrasonic assisted magnetic abrasive finishing
Received date: 2024-05-09
Online published: 2024-12-11
为了改善选区激光熔化TC4合金的表面质量,采用超声辅助磁力研磨技术进行光整加工。模拟了不同磁极尺寸和研磨区域下磁通密度的大小和分布情况。对空化泡在复合场下受力进行分析,研究磁场对空化效应的影响机理。分析了施加超声振动前后试样表面形貌的变化规律,研究了振幅、研磨转速和研磨时间对表面粗糙度的影响规律。结果表明,随着磁极直径和高度的增加,磁感应强度增加,磁通密度的分布逐渐由不均匀向均匀变化。在80 mm的固定位置研磨效果较好,平均磁场力为17.12 mN,表面粗糙度为0.673 μm。施加超声振动后,原始表面凸起和缺陷被完全去除,表面有细长的划痕,表面粗糙度降至0.243 μm。与磁力研磨工艺相比,表面粗糙度降低了60%。磁场对空化效应的抑制作用降低了空化泡溃灭时释放的能量,从而减小了空化效应对表面造成的损伤。
杨光 , 王涛 , 王雨时 , 安达 . 超声辅助磁力研磨对选区激光熔化TC4合金表面质量的影响[J]. 沈阳航空航天大学学报, 2024 , 41(5) : 34 -43 . DOI: 10.3969/j.issn.2095-1248.2024.05.004
To improve the surface quality of TC4 alloy prepared by selective laser melting,the ultrasonic assisted magnetic abrasive finishing technology for polishing was adopted.Simulated the size and distribution of magnetic flux density under different magnetic pole dimensions and finishing areas.The cavitation bubble in the composite field force was analysed,the magnetic field on the cavitation effect on the influence mechanism was studied.The changes in surface morphology of the specimen before and after applying ultrasonic vibration were analyzed.The influence of amplitude,finishing rotate speed and finishing time on surface roughness were studied.The results show that as the diameter and height of the magnetic poles increase,the magnetic induction intensity increases and the distribution of magnetic flux density gradually changes from uneven to uniform.The finishing effect is better at the position of 80 mm,with an average magnetic field force of 17.12 mN and a surface roughness of 0.673 μm.After applying ultrasonic vibration,the original surface bumps and defects are completely removed,the surface exhibites fine scratches and the surface roughness is reduced to 0.243 μm.Compared with the magnetic abrasive finishing process,the surface roughness is reduced by 60%.The suppression effect of the magnetic field on the cavitation effect reduces the energy released when the cavitation bubble collap-ses, thus reducing the damage caused by the cavitation effect on the surface.
表1 TC4钛合金粉末的化学成分 (%) |
元素 | Al | V | Fe | O | C | N | H | Ti |
---|---|---|---|---|---|---|---|---|
含量 | 6.100 | 4.100 | 0.150 | 0.120 | 0.020 | 0.020 | 0.006 | 89.484 |
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