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清华大学学报(自然科学版)  2019, Vol. 59 Issue (4): 291-297    DOI: 10.16511/j.cnki.qhdxxb.2019.22.006
  机械工程 本期目录 | 过刊浏览 | 高级检索 |
六轴联动数控机床的联动模式切换
张鹏翔, 周凯, 李学崑
清华大学 机械工程系, 北京 100084
Linkage modes switch for a six-axis linkage CNC machine tool
ZHANG Pengxiang, ZHOU Kai, LI Xuekun
Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China
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摘要 为了优化六轴联动数控机床的刀具中心点运动轨迹误差,提出了利用联动模式切换实现该误差最小的方法。建立了六轴联动数控机床的运动学模型,研究机床的冗余联动特点,并定义了冗余旋转联动轴。根据冗余联动特点,研究了满足不同刀具运动要求的联动模式和联动轴形式。建立了刀具中心点运动轨迹误差模型,提出了利用联动模式和联动轴形式切换优化该误差的方法。在实际机床上进行加工实验,通过联动模式的切换实现了刀具中心点轨迹误差的优化。
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张鹏翔
周凯
李学崑
关键词 加工误差的综合分析和提高加工精度的途径六轴联动数控机床冗余联动轴联动模式模式切换    
Abstract:The trajectory error of the tool center point in a six-axis computer numerical control (CNC) machine tool was minimized by switching the multiple linkage modes. A kinematic model of the six-axis linkage CNC machine tool was used to analyze the redundant linkages and redundant rotational linkages of the machine tool. The redundant linkage characteristics were then used to identify the linkage modes and linkage axes that provided the desired tool motion. A trajectory error model for the tool center point was used to switch the linkage modes and linkage axes to minimize the error. Tests on a CNC machine tool show that the model accurately predicts how to switch the linkage modes to minimize the tool center point trajectory error.
Key wordscomprehensive analysis and ways to improve machining accuracy    six-axis linkage computer numerical control (CNC) machine tool    redundant linkage axis    linkage modes    modes switch
收稿日期: 2018-09-13      出版日期: 2019-04-09
基金资助:国家高技术研究发展计划(2014AA041605)
通讯作者: 周凯,教授,E-mail:zhoukai@tsinghua.edu.cn     E-mail: zhoukai@tsinghua.edu.cn
引用本文:   
张鹏翔, 周凯, 李学崑. 六轴联动数控机床的联动模式切换[J]. 清华大学学报(自然科学版), 2019, 59(4): 291-297.
ZHANG Pengxiang, ZHOU Kai, LI Xuekun. Linkage modes switch for a six-axis linkage CNC machine tool. Journal of Tsinghua University(Science and Technology), 2019, 59(4): 291-297.
链接本文:  
http://jst.tsinghuajournals.com/CN/10.16511/j.cnki.qhdxxb.2019.22.006  或          http://jst.tsinghuajournals.com/CN/Y2019/V59/I4/291
  图1 六轴联动数控机床结构
  表1 机床联动轴行程
  图2 联动模式相互关系示意图
  图3 抛光轮中心点运动轨迹误差示意图
  图4 联动模式切换流程图
  图5 (网络版彩图)工件与抛光轮关系示意图
  图6 工件特征分布
  图7 (网络版彩图)机床实际加工过程
  表2 抛光轮中心点轨迹误差最大值
  图8 (网络版彩图)不同措施下工件特征7的 表面抛光效果
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