摘要
针对航空钛合金零件精加工后使役性能大幅降低问题,提出基于旋转超声加工的表面强化技术。通过旋转超声铣削试验探究了超声加工工艺参数对钛合金表面粗糙度、表面硬度和残余应力的影响规律,分析了高频低幅的超声振动对钛合金表面质量的作用机制。试验结果表明,超声铣削加工过程中主轴转速对钛合金表面完整性影响显著;不同转速下的超声铣削钛合金表面形貌呈现为周期性的鱼鳞状且其表面粗糙度均高于普通铣削钛合金表面粗糙度;超声铣削加工钛合金表面残余应力为压应力,相较于普通铣削,钛合金表面残余应力绝对值提高了25.9%~59.3%;与普通铣削相比,采用超声铣削可以使表面显微硬度提高7.6%~14.3%。
Aiming at the problem that the service performance of aviation titanium alloy parts is greatly reduced after finishing,a surface strengthening technology based on rotary ultrasonic machining is proposed.Based on the rotary ultrasonic milling experiment,the effect of ultrasonic machining process parameters on the surface roughness,surface hardness and residual stress of titanium alloy is explored,and the mechanism of high-frequency and low-amplitude ultrasonic vibration on the surface quality of titanium alloy is analyzed.The experimental results show that the spindle speed has a significant effect on the surface integrity of titanium alloys during ultrasonic milling.The surface morphology of ultrasonic milling titanium alloys at different speeds presents periodic fish scales,and the surface roughness is higher than that of ordinary milling titanium alloys.In addition,the residual stress on the surface of titanium alloy processed by ultrasonic milling is compressive stress.Compared with ordinary milling,the absolute value of residual stress on the surface of titanium alloy is increased by 25.9%-59.3%.And compared with ordinary milling,ultrasonic milling can increase the surface microhardness by 7.6%-14.3%.
作者
张铁
汪振华
袁军堂
郑侃
Zhang Tie;Wang Zhenhua;Yuan Juntang;Zheng Kan(School of Mechanical Engineering,Nanjing University of Science and Technology,Nanjing 210094,China)
出处
《工具技术》
北大核心
2023年第9期40-44,共5页
Tool Engineering
