摘要
为研究超声振动对成形过程中塑性变形的作用机理,探究了不同超声振幅与不同步距条件下超声振动对成形力及微观组织的影响。首先,搭建了基于数控铣床的超声辅助渐进成形实验平台,其中施加在工具头上的超声振动振幅可调。然后,进行了不同超声振幅以及不同步距条件下的直槽渐进成形实验,并对轴向和横向成形力进行了采集与分析,对施加超声振动条件后成形件的微观组织进行了观察。结果表明,施加超声振动后轴向力和横向成形力都有所减小,其中横向力的减小效果比轴向力明显,较小步距相比较大步距对于成形力的减小具有更好的效果。成形力下降率随着超声振幅的增大而增大,但是减小幅度会随成形步的增加而减小。
In order to research the plastic deformation mechanism of ultrasonic vibration in the forming process,the influences of ultrasonic vibration with different vibration amplitudes and different step sizes on the forming force and microstructure were investigated. First,an experimental platform of ultrasonic-assisted ISF based on CNC milling machine was set up,and the ultrasonic vibration amplitude of forming tool could be controlled. Then,the straight groove incremental forming tests were performed under different ultrasonic vibration amplitudes and step sizes. Furthermore,the forming forces in both vertical and horizontal directions were recorded and analyzed,and the microstructure after forming under ultrasonic vibration was observed. The results show that the forming forces in both vertical and horizontal directions decrease due to the application of ultrasonic vibration. Specifically,the force reduction effect is more significant for horizontal force and with smaller step sizes. Thus,the force reduction rate increases with the increase of vibration amplitude,and the vibration amplitude decreases with the increase of the forming step size.
作者
翟维东
陈晓晓
李燕乐
孙玲玲
李剑峰
赵国群
Zhai Weidong;Chen Xiaoxiao;Li Yanle;Sun Lingling;Li Jianfeng;Zhao Guoqun(Key Laboratory of High Efficiency and Clean Mechanical Manufacture,Ministry of Education,School of Mechanical Engineering,Shandong University,Ji＇nan 250061,China;National Demonstration Center for Experimental Mechanical Engineering Education（Shandong University）,Ji＇nan 250061;School of Material Science ＆ Engineering,Shandong Univeity,Ji＇nan 250061,China)
出处
《锻压技术》
CAS
CSCD
北大核心
2018年第8期80-84,102,共6页
Forging & Stamping Technology
基金
国家自然科学基金青年项目(51605258)
中国博士后科学基金(2016M592180)
山东省博士后创新项目(201701011)
山东大学基本科研业务费(2016TB006)
关键词
渐进成形
超声振动
成形力
微观组织
板材成形
incremental forming
ultrasonic vibration
forming force
microstructure
sheet forming
作者简介
翟维东（1995-），男，硕士研究生E-mail：zhai_weidong@qq．com;通讯作者：李燕乐（1989-），男，博士，副研究员E-mail：yanle．1i@sdu．edu．cn
