摘要
选区激光熔化(SLM)技术在复杂点阵结构制造中得到广泛应用,但打印过程中点阵结构的热力行为会影响工件的成形质量。为研究支柱尺寸对钛合金点阵结构薄壁件的温度变化、残余应力及变形量的影响,设计了3组不同支柱尺寸的Ti6Al4V点阵结构薄壁件模型,观察了其成形过程中的温度变化分布,分析了成形件冷却至室温后的Von-Mises应力和变形量。结果表明,对于不同支柱尺寸的点阵结构,随着支柱尺寸的增加,最高瞬时温度不断增加,由1271.35℃增加到1396.28℃,最大残余应力也从1207.8 MPa增加到1369.2 MPa。较大残余应力的部位主要分布在各个结构的节点区域,Z方向的应力最大,X方向和Y方向次之。由于支柱尺寸的增加,残余应力增加,单个支柱的质量增大,点阵结构的变形量也增大,由0.0919 mm增大到0.1730 mm,且观察到两侧处支柱的变形量最大。因此在实际打印过程中,需根据模拟结果在变形最大处添加支撑以防止薄壁件在打印过程中出现严重的变形,达到控制成形质量的目的。
Selective laser melting(SLM)technology is widely used in the manufacture of complex lattice structures,but the thermal-mechanical behavior of lattice structures affects the forming quality of the workpiece during printing.In order to study the effect of pillar size on the temperature changes,residual stress and deformation of titanium alloy lattice thin-walled parts,three groups of Ti6Al4V lattice thin-walled parts models with different pillar sizes were designed.The temperature change distribution during the forming process was observed,and the Von-Mises stress and deformation of the formed parts after cooling to room temperature were analyzed.The results show that for lattice structures with different pillar sizes,with the increase of pillar size,the maximum instantaneous temperature increases from 1271.35℃to 1396.28℃,and the maximum residual stress also increases from 1207.8 MPa to 1369.2 MPa.The larger residual stress is mainly distributed in the node area of each structure,and the stress in the Z-direction is the largest,followed by the X-direction and the Y-direction.Due to the increase of the pillar size,the residual stress and the weight of a single pillar increases,and the deformation of the lattice structure also increases from 0.0919 mm to 0.1730 mm,and the deformation of the pillars on both sides is observed to be the largest.Therefore,in the actual printing process,it is necessary to add support at the position with the maximum deformation according to the simulation results to prevent serious deformation of the thin-walled parts during the printing process,so as to control the forming quality.
作者
蔡高参
胡宇恒
刘辉
汪小康
彭凯
CAI Gaoshen;HU Yuheng;LIU Hui;WANG Xiaokang;PENG Kai(Zhejiang Sci-Tech University,Hangzhou 310018,China)
出处
《航空制造技术》
北大核心
2025年第10期50-57,共8页
Aeronautical Manufacturing Technology
基金
浙江省自然科学基金资助项目(LQ18E050010)
中国博士后基金资助项目(2018M642482)
浙江理工大学青年创新专项项目(22242297-Y)。
关键词
选区激光熔化(SLM)
钛合金
薄壁件
支柱尺寸
残余应力
温度分布
Selective laser melting(SLM)
Titanium alloy
Thin-walled parts
Pillar size
Residual stress
Temperature distribution
作者简介
蔡高参,副教授,研究方向为激光增材制造、充液成形技术及超声相控阵无损检测技术。
