Experimental investigation into effects of different ultrasonic vibration modes in micro-extrusion process
Experimental investigation into effects of different ultrasonic vibration modes in micro-extrusion process
复制标题
微挤压过程中不同超声振动模式影响的实验研究
DOI：
10.1016/j.jmapro.2021.05.007
复制
发表时间：
2021-07
影响因子：
6.2
通讯作者：
Guangchao Han;Weiqiang Wan;Zhaochen Zhang;Linhong Xu;Fuchun Liu;Haiou Zhang
中科院分区：
文献类型：
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作者：
Guangchao Han;Weiqiang Wan;Zhaochen Zhang;Linhong Xu;Fuchun Liu;Haiou Zhang
As an auxiliary energy field for non-traditional forming processes, ultrasonic vibration has been proven effective for improving the forming characteristics of micro-forming process (MFP) in recent years. The ultrasonic vibration was often applied on the forming tool but seldom on the workpiece in the MFP, which was usually restricted by the random shape or size of workpiece. A special porous sonotrode platform and press machine was proposed by our research group to realize different ultrasonic vibration modes of tool vibration or workpiece vibration flexibly. In this paper, a new ultrasonic micro-extrusion process of tool-workpiece compound vibration was developed and the ultrasonic micro-extrusion experiments of copper T2 and the microstructure of the extrusion parts were studied for clarifying the influencing mechanism of different ultrasonic vibration modes and micro-extrusion characteristics in different forming directions. The results indicate that the tool-workpiece composite vibration mode can achieve better micro-forming characteristics than single workpiece or tool vibration mode, such as severe grain deformation effects, pronounced fiber flow lines, better micro-extrusion formability and significant flow stress softening effects. The different ultrasonic energy transmitted and absorbed by the forming materials under different ultrasonic vibration mode is the key factor for the abovementioned results. The research results are helpful to reveal the ultrasonic assisted micro-forming mechanisms of different ultrasonic vibration modes.
