主轴转速对车刀三向振动频域特性影响的试验设计
【毕业论文关键词】车削振动；三向加速度；频域分析；自功率谱密度
The Experimental Design of the Effect of Spindle Speed on the Frequency Domain Characteristic of Tool Three-way
Turning Vibration
【Abstract】It always causes chattering in the process of turning. This harmful vibration will make the surface chatter and have a great influence to shape accuracy, dimensional accuracy, position accuracy and surface roughness. Therefore, it is necessary to analyze the reasons of the turning vibration and take appropriate measures to eliminate or reduce the vibration. This paper studies the effect of the spindle speed on the frequency domain characteristic of tool three-way vibration , which uses the horizontal lathes of CJK6136-MATE-360×570 produced by Jinan lathes as tentative platform and uses three-acceleration sensor to measure vibration singals generated by the sword surface of the three kinds of tools of the elementary wear, moderate wear and severe wear and uses Beijing's WS-DAQ vibration signal acquisition instrument with matching spectral analysis software to capture, analyze vibration signals measured to obtain the self-power spectral density curve of tool vibration acceleration signals . The results show that: (1) With the spindle speed increases, the largest self- power spectral density in three directions of axial, radial, tangential is reduced after the first increase .When the spindle speed is in 1600r / min or so, the self-power spectrum is the smallest. (2) Regardless of the changes of the spindle speed , the self-power spectrum in the radial direction has the maximum, tangential direction center, a minimum in the axial direction; (3) During the cutting process, whether it is in three different cutting direction, or three different degree of wear of tools, tools from the power spectrum corresponding to the maximum vibration frequency remains about 50Hz.
【Keyword】Turning vibration; Three-acceleration; Frequency domain analysis; Self-power Spectral Density
目 录
摘要 1
1 绪论 5
1.1研究意义 5
1.2研究现状 5
1.3课题研究内容 7
1.4课题研究方法和技术路线 7
1.4.1研究方法 7
1.4.2技术路线 8
2 机械振动测量理论基础 9
2.1振动的基本原理 9
2.2振动测量参数 9
2.3测振传感器与放大器 10
2.3.1测振传感器 10
2.3.2测振放大器 13
2.3.3传感器的选择 14
3 振动信号频域分析理论基础 15