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清华大学学报(自然科学版)  2017, Vol. 57 Issue (2): 113-119    DOI: 10.16511/j.cnki.qhdxxb.2017.22.001
  机械工程 本期目录 | 过刊浏览 | 高级检索 |
基于机电建模的加工中心轴间耦合问题
赵彤, 谢溢, 胡建
清华大学 机械工程系, 精密超精密制造装备与控制北京市重点实验室, 北京 100084
Multi-axis coupling of machining centers based on electromechanical modeling
ZHAO Tong, XIE Yi, HU Jian
Beijing Key Laboratory of Precision/Ultra-Precision Manufacturing Equipments and Control, Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China
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摘要 加工中心加工精度与其整机结构特性和各轴控制特性密切相关。考虑进给轴间的动态激励响应,研究加工中心整机在特定频率范围内的各向动柔度,对辅助机床设计具有重要意义。该文结合有限元建模和相关实验方法,分析了某双驱进给平台的结构动柔度,重点研究其机械系统的轴间耦合问题。提出了一种用传递函数组等效机械结构特性的整机机电联合仿真建模方法,并以此研究了某卧式加工中心机电系统的轴间耦合问题。研究结果表明:当加工中心存在某些模态振型同时影响刀具或工件在多方向的变形时,其机械系统和机电系统的轴间耦合在整机动柔度研究和控制环参数选择时必须予以考虑。
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关键词 加工中心轴间耦合有限元建模机电建模    
Abstract:The dynamic accuracy of a machining center is strongly influenced by its structural dynamics and control loops. The frequency response of the entire machine including the multi-directional dynamics is important in the machine tool design phase. The structural dynamics of a twin ball screw feed machine are analyzed using a finite element analysis (FEA) and measurements with a focus on the multi-axis coupling of its mechanical system. Then, an electromechanical modeling method is developed where the structural dynamics are replaced by transfer functions to study the multi-axis coupling of the electromechanical system of a horizontal machining center. The results show that when there are modal shapes leading to displacements of the tool or the workpiece in multiple directions, the multi-axis coupling of the machining center must be considered in studies of the dynamics and control parameters.
Key wordsmachining center    multi-axis coupling    finite element modeling    electromechanical modeling
收稿日期: 2016-05-26      出版日期: 2017-02-15
ZTFLH:  TG502.3  
引用本文:   
赵彤, 谢溢, 胡建. 基于机电建模的加工中心轴间耦合问题[J]. 清华大学学报(自然科学版), 2017, 57(2): 113-119.
ZHAO Tong, XIE Yi, HU Jian. Multi-axis coupling of machining centers based on electromechanical modeling. Journal of Tsinghua University(Science and Technology), 2017, 57(2): 113-119.
链接本文:  
http://jst.tsinghuajournals.com/CN/10.16511/j.cnki.qhdxxb.2017.22.001  或          http://jst.tsinghuajournals.com/CN/Y2017/V57/I2/113
  图1 TCB1双驱进给平台
  表1 进给平台部分结合部参数
  图2 进给平台模态实验
  表2 进给平台模态分析结果
  图3 进给平台x向激励仿真与实验结果对比
  图4 进给平台各向结构动柔度
  图5 双驱卧式加工中心机电系统结构
  表3 卧加整机部分结合部参数
  图6 卧加整机部分模态振型
  图7 卧加整机各向结构动柔度
  图8 卧加整机z向控制环模型
  表4 卧加整机控制环主要参数
  图9 卧加整机机电联合仿真模型
  图10 控制参数对整机动柔度Gzz的影响
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