旋转镗杆切削颤振稳定性预测  

Stability prediction of rotating boring bar

作　　者：马伯乐 任勇生[1] 张玉环[1] 张金峰[1] MA Bole;REN Yongsheng;ZHANG Yuhuan;ZHANG Jinfeng(College of Mechanical and Electronic Engineering,Shandong University of Science and Technology,Qingdao 266590,China)

机构地区：[1]山东科技大学机械电子工程学院

出　　处：《振动与冲击》2019年第16期115-122,共8页Journal of Vibration and Shock

基　　金：国家自然科学基金(11672166)

摘　　要：研究考虑主轴旋转和内、外阻的镗杆颤振稳定性。将镗杆简化为二自由度模型,引入旋转陀螺和离心力以及内、外阻,结合再生时滞镗削力模型,建立旋转镗杆的颤振的动力学分析模型。采用频域法导出旋转镗杆切削系统的稳定性极限的求解公式。与时域数值积分结果的一致性验证了镗削稳定性叶瓣图计算结果的正确性。结果表明,旋转陀螺效应降低了镗削过程的临界切削深度。内、外阻之和越大,切削临界切削深度越大,在内、外阻之和给定时,内阻越大切削过程越稳定。同时提高镗杆的刚度和系统切削刚度将会分别导致临界切削深度的增加和减小。The chatter stability of boring bar considering spindle rotation and internal and external damping was studied.The boring bar was simplified as a two-degree-of-freedom model.The dynamic analysis model of the chatter of the rotary boring bar was established by introducing the rotating gyroscope,centrifugal force,internal and external damping,and combining with the regenerative time-delay boring force model.The formula for calculating the stability limit of the rotary boring bar cutting system was derived by a frequency domain method.The numerical integration results in the time domain verifies the correctness of the results of stability lobe diagram for boring.The results show that the rotary gyro effect reduces the critical cutting depth in the boring process.The greater the sum of internal and external damping,the greater the critical cutting depth,the more stable the cutting process.When the sum of internal and external damping is given,the greater of internal damping,also the more stable the cutting process.Increasing the rigidity of the boring bar and the system cutting rigidity will lead to the increase and decrease of the critical cutting depth,respectively.

关 键 词：镗削 颤振 稳定性预测 陀螺效应 内阻与外阻 

分 类 号：TH113[机械工程—机械设计及理论] TG54[金属学及工艺—金属切削加工及机床]