Evolution of texture distribution in thickness direction of aluminum sheet in metal spinning
Evolution of texture distribution in thickness direction of aluminum sheet in metal spinning
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金属旋压中铝板厚度方向织构分布的演变
DOI：
10.1016/j.matchar.2022.111877
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发表时间：
2022
影响因子：
4.7
通讯作者：
Hanada Kotaro
中科院分区：
文献类型：
--
作者：
Gondo Shiori;Arai Hirohiko;Kajino Satoshi;Hanada Kotaro
研究了旋压后织构在厚度方向上的分布，阐明了金属旋压过程中织构晶体取向变化的机理。采用欠旋压、真剪旋压、过旋压等工艺将1.44 mm厚的铝盘毛坯分别旋压成圆锥体、圆锥体和圆柱体，并进行13道次常规旋压。用电子背散射衍射法进行的晶体取向分析表明，对小米勒指数的取向密度的计算可以对高强度织构进行系统的评价。在剪切旋压件的辊侧、剪切旋压成形的工件的辊侧、常规旋压成形的壁部的辊侧和开口部的芯轴侧，Cu1 1 1的取向密度降低或B的取向密度增加。余弦相似度和欧氏距离表明，剪切旋压得到的织构分布与常规旋压得到的壁面织构分布相似。根据拉深过程中的应力状态和择优取向，阐述了旋压过程中晶体取向变化的机理。当周向施加拉应力时，平行于盘面的{110}(对应于本研究中的B)的织构密度增加，而当以类似的方式施加压应力时，平行于盘面的{112}(对应于Cu)织构的密度增加。
We evaluated the texture distribution in the thickness direction of the spun workpieces and clarified the mechanism of the change in the crystal orientation of the texture during metal spinning. Blank aluminum disks with a thickness of 1.44 mm were deformed into circular truncated cone cups by under-, true shear, and over-spinning and into cylindrical cups by 13 passes of conventional spinning. Crystal orientation analysis using electron backscatter diffraction revealed that the calculations of the orientation densities for small Miller indices could lead to a systematic evaluation of high intensity texture. The orientation density of Cu {121}< 1 1¯ 1> decreased or that of B {110}< 1 1¯ 2> increased on the roller side of the shear-spun part, of the workpieces formed by shear spinning, and on the roller side of the wall part and on the mandrel side of the open-edge part, of the workpieces formed by conventional spinning. The cosine similarity and Euclidean distance showed that the texture distributions obtained by shear spinning and that of the wall part obtained by conventional spinning were similar. Based on the stress state and preferred crystal orientation in deep drawing, the mechanism of the change in crystal orientation during spinning were described. The density of the texture with {110}(corresponding to B in this study) parallel to a disk plane increased when tensile stress was applied in the circumferential direction, contrarily, when compressive stress was applied in a similar fashion the density of the texture with {112}(corresponding to Cu) parallel to the disk plane increased.