摘要
针对航空钛合金零件机加工后疲劳强度大幅降低的问题,提出基于旋转超声铣削的抗疲劳制造技术。基于变切削速度和变超声振幅的旋转超声铣削实验,探究传统工艺参数及超声振动参数对钛合金残余应力和疲劳寿命的影响规律。开展变疲劳加载频率的有无超声对比实验,验证了超声振动对钛合金疲劳强化效应的普适性。实验结果表明,随着切削速度的提高和超声能量的摄入,钛合金残余压应力增加,疲劳强化效应显著;相较于传统铣削,不同加载频率条件下的超声铣削可提高钛合金疲劳寿命20.3%。
An anti-fatigue manufacturing technology based on rotary ultrasonic milling is proposed to reduce the fatigue strength of aerospace titanium alloy parts after machining.Based on rotary ultrasonic milling experiments with variable cutting speed and ultrasonic amplitude, the effects of conventional process parameters and ultrasonic vibration parameters on the residual stress and fatigue life of titanium alloy are investigated.In addition, experiments are carried out to verify the universality of ultrasonic vibration effect on fatigue strengthening of titanium alloy.The experimental results show that with increasing cutting speed and absorbed ultrasonic energy, the residual stress of titanium alloy increases and the fatigue strengthening effect is significant.Compared with conventional milling, ultrasonic milling can increase the fatigue life of titanium alloy by 20.3% under different loading frequencies.
作者
杨巍
王宇
周元莉
Yang Wei;Wang Yu;Zhou Yuanli(Shenyang Aircraft Industrial(Group)Co.,Ltd.,Shenyang 110034,China)
出处
《工具技术》
北大核心
2023年第7期57-60,共4页
Tool Engineering
基金
国家重点研发计划(2019YFB2005405-03)。
