聚焦声透镜对钛钽合金微切削的影响  

Effect of Focusing Acoustic Lens on Microcutting of Titanium Tantalum Alloy

作　　者：郭嘉诚 祝锡晶 李婧 Guo Jiacheng;Zhu Xijing;Li Jing

机构地区：[1]中北大学机械工程学院,太原市030051

出　　处：《工具技术》2024年第5期21-25,共5页Tool Engineering

基　　金：国家自然科学基金(51975540);山西省自然科学青年基金(202203021222041);山西省先进制造技术重点实验室2022年度开放基金(XJZZ202202)。

摘　　要：功率超声振动加工钛钽合金时,空化微射流的数量与速度是微切削加工效率的关键影响因素,使用聚焦声透镜可以提高聚焦区域的声压和空化效率,加工效率随着微射流的数量和速度增大而增大。设计并制作了基于35kHz声源频率的菲涅尔衍射透镜,借助COMSOL软件对透镜工作环境进行模拟,确定最佳工作位置,透镜会改变超声场内声压分布,将声压汇聚在更窄范围内,透镜聚焦增益2~10倍。根据仿真结果进行的钛钽合金空蚀实验结果表明,相较于无透镜组,有透镜组的钛钽合金表面粗糙度变化更大,空蚀坑数量更多,坑深与径宽更大,可以认为菲涅尔聚焦声透镜对钛钽合金微切削有促进作用。When using power ultrasonic vibration to process titanium tantalum alloy,the number and speed of cavitation micro jets are key to the efficiency of micro cutting.Using a focusing acoustic lens to increase the sound pressure in the focusing area can improve cavitation efficiency.Increasing the number and speed of micro jets leads to an increase in machining efficiency.A Fresnel diffraction lens based on a 35kHz sound source frequency is designed and manufactured.The working environment of the lens is simulated using COMSOL software,and the optimal working position is determined.The lens will change the sound pressure distribution in the ultrasonic field,concentrate the sound pressure in a narrower range,and the lens focusing gain will be 2 to 10 times.Based on the simulation results,cavitation experiments are conducted on titanium tantalum alloy.The experimental results show that compared to the lensless group,the surface roughness of titanium tantalum alloy with a lens group changes more,the number of cavitation pits is more,and the pit depth and diameter width are larger.It can be considered that Fresnel focusing sound lenses have a promoting effect on micro cutting of titanium tantalum alloy.

关 键 词：超声聚焦 菲涅尔透镜 钛钽合金 

分 类 号：TG136.4[一般工业技术—材料科学与工程] TH162.1[金属学及工艺—合金] TB559[金属学及工艺—金属学]