Investigation on effect of ultrasonic vibration on micro-blanking process of copper foil
Investigation on effect of ultrasonic vibration on micro-blanking process of copper foil
复制标题
超声波振动对铜箔微冲裁加工影响的研究
DOI：
10.1007/s00170-017-0684-4
复制
发表时间：
2017-11-01
影响因子：
3.4
通讯作者：
Guo, Bin
中科院分区：
文献类型：
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作者：
Liu, Yang;Wang, Chunju;Guo, Bin
研究表明，尺寸效应对微小零件的成形质量和精度有明显的影响。然而，寻找有效的方法来降低尺寸效应的影响仍然是一个亟待解决的问题。近年来，超声振动在工业金属成形中得到了广泛的应用，实践证明，与常规冲裁相比，超声振动有助于提高断面质量。在这项研究中，微冲裁过程进行了专门开发的设备。通过对T2铜箔方孔微观组织演变、裂纹萌生、剪切表面质量等方面的分析，发现超声振动辅助微冲裁过程中的软化效应抑制了裂纹萌生，提高了光滑区的比例。变形区组织分析表明，剪切变形区变小，圆角半径减小。超声振动对光滑区的表面粗糙度有一定的影响，使光滑区的表面粗糙度降低。与传统的微冲裁相比，在凸模上施加超声振动的复合塑性成形技术可以提高光滑区的比例，降低表面粗糙度和圆角半径，从而提高断面表面质量。实验结果揭示了超声振动辅助铜箔微冲裁过程中剪切变形行为的机理，证实了超声振动可以作为提高微冲裁成形质量的一种手段。
Investigations have revealed that size effect obviously affects forming quality and accuracy of micro parts. However, to find effective approaches that can reduce the influence of size effect is still a critical problem to be solved. Ultrasonic vibration has been widely used in industrial metal forming recently, and it has been proved that it is helpful for improving section quality compared with conventional blanking. In this study, micro-blanking process was carried out with a specially developed device. The square holes of copper foil T2 were investigated by analyzing the evolution of microstructure, crack initiation, quality of shearing surface, etc. Inhibition of crack initiation is found due to the softening effect in ultrasonic vibration assisted micro-blanking by analyzing section obtained under different ratios of blanking stroke to thickness (h/t), which increases the ratio of smooth zone. The analysis of microstructure in deformation area shows that a shearing deformation area becomes smaller, and radius of fillet decreases. Surface roughness of smooth zone decreases with ultrasonic vibration due to polishing effect. Compared with traditional micro-blanking, this compound plastic forming technology applying ultrasonic vibration on the punch can improve the section surface quality by increasing the ratio of smooth zone, and decreasing the surface roughness and fillet radius. The experimental outcomes reveal the mechanism of shearing deformation behavior during ultrasonic vibration assisted micro-blanking process of copper foil and the findings confirm that ultrasonic vibration can be regarded as a way to improve the forming quality of micro-blanking.