摘要
为研究高温合金Inconel 625车削过程中锯齿形切屑的产生对颤振的影响,本文通过有限元软件对车削刀具、机床主轴等部件进行模态仿真,获取对应的模态频率;进行不同切削参数的车削试验,采集加速度信号并进行频域分析以获取其FFT功率谱。通过超景深显微镜观察切屑形态,并计算不同切削参数下的切屑锯齿化频率。对比仿真和试验结果发现:当切屑锯齿化频率接近于车床某部件的主振频率时,产生了较大的颤振峰值,这说明锯齿形切屑的产生会诱导切削颤振发生,对切削过程稳定性产生了不利的影响。
In order to research the influence of serrated chip formation on chatter stability during turning superalloy Inconel 625,this paper conducts modal simulation of machine components such as the tool and spindle et al. through the finite element software. And their mode frequencies are obtained. Turning experiments of different cutting parameters are carried out,in which dynamic cutting force signals and vibration signals are acquisited and analyzed in frequency domain to obtain the FFT power spectra. Chip morphologies are observed by optical microscope and chip serration frequencies under different cutting parameters are calculated. Based on comparing simulation with experiment results,it is found that larger peak amplitude appeared when the frequency of serrated chip formation is approximately equal to the modes of one component of machine tool. This phenomenon indicates that the serrated chip formation leads to cutting chatter,and produces adverse effects on the stability of machining process.
出处
《工具技术》
北大核心
2017年第2期9-13,共5页
Tool Engineering
基金
国家科技重大专项(2014ZX04001020-011)
