主轴振动对表面波纹度影响及预测模型分析

陈东菊; 李源; 李天宝; 范晋伟

doi:10.13433/j.cnki.1003-8728.20200006

主轴振动对表面波纹度影响及预测模型分析

doi: 10.13433/j.cnki.1003-8728.20200006

北京工业大学机电学院，北京　100124

基金项目: 国家自然科学基金项目（51875005，51475010）资助

详细信息

作者简介:
陈东菊（1980−），教授，博士生导师，研究方向为超精密数控加工与自动化装备，djchen@bjut.edu.cn

中图分类号: TH16
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- 文章访问数: 278
- HTML全文浏览量: 46
- PDF下载量: 44
- 被引次数: 0
出版历程
- 收稿日期: 2019-11-05
- 网络出版日期: 2021-02-02
- 刊出日期: 2020-12-05

Influence of Spindle Vibrationon Surface Waviness and Prediction Model

School of Mechanical Engineering, Beijing University of Technology, Beijing 100124, China

摘要

摘要: 机床加工精度的影响因素中，静压主轴系统的动态特性引起的振动是加工表面波纹度产生的重要因素。基于主轴振动信息建立波纹度的生成模型，求解得到6个影响因素的灵敏度中径向轴承的位置是影响表面波纹度的主要因素。建立评价体系，通过相关法来评估生成模型与实际加工表面波纹结果之间的关系，得到了高于0.45的相关系数。最后利用功率谱密度提取主轴系统的频谱特性，发现主轴振动是影响加工精度的主要因素。
- 表面波纹度 /
- 主轴振动 /
- 相关性 /
- 评价体系
Abstract: In the analysis of the factors affecting the machining accuracy of the machine tool, the vibration caused by the dynamic characteristics of the hydrostatic spindle system is an important factor in the surface waviness of the machined surface. The generation model for waviness is established according to the vibration information of the main shaft, and the sensitivity of the six influencing factors is obtained. The position of the radial bearing is the main factor affecting the surface waviness. Then the evaluation system is established, and the relationship between the generated model and the actual processed surface ripple result is evaluated by using the correlation method, and a correlation coefficient above 0.45 is obtained. Finally, with the power spectral density to extract the spectral characteristics of the spindle system, it is found that the spindle vibration is the main factor affecting the machining accuracy.
- surface waviness /
- spindle vibration /
- correlation /
- evaluation system

HTML全文

图 1 主轴系统的结构

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图 2 主轴系统的平衡模型

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图 3 主轴系统的动态模型

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图 4 轮廓仪PGI1240所测得的工件波纹结果

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图 5 不同转速下仿真和测量的波纹

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图 6 两个加工过程的相关度

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图 7 波纹结果的频谱特性

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表 1 主轴系统的参数

主轴系统的质量	300 kg
径向刚度K_ra，K_rb	100 N/μm
推力轴承刚度K_t	300 N/μm
距离理想中心的偏心距	1 μm
主轴半径R	120 mm
工作台半径	500 mm

下载: 导出CSV

表 2 影响因素的灵敏度比

因素	L₄-L_c	K_x	K_z	C_x和C_z	M	ω
初始值	0.258	0.258	0.258	0.258	0.258	0.258
10倍	0.326	0.261	0.262	0.259	0.265	0.26
误差/%	26	1.1	1.5	0.38	1.9	0.77

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