摘要
为降低转动轴几何误差对转台-摆头式五轴机床精度的影响,提出了基于球杆仪的位置无关几何误差测量和辨识方法。基于多体系统理论及齐次坐标变换方法建立了转台-摆头式五轴机床位置无关几何误差模型,依据旋转轴不同运动状态下的几何误差影响因素建立基于圆轨迹的四种测量模式,并实现10项位置无关几何误差的辨识。利用所建立的几何误差模型进行数值模拟,确定转动轴的10项位置无关几何误差对测量轨迹的影响。最后,采用误差补偿的形式实验验证所提出的测量及辨识方法的有效性,将位置无关几何误差补偿前后的测量轨迹进行比较。误差补偿后10项位置无关几何误差的平均补偿率为70.4%,最大补偿率达到88.4%,实验结果表明所提出的建模和辨识方法可用于转台-摆头式五轴机床转动轴精度检测,同时可为机床精度评价及几何精度提升提供依据。
In order to reduce the influence of the geometrical error of rotary axis on the accuracy of turntable-tilting head type five-axis machine tools,a Position-Independent Geometric Error(PIGE)measurement and identification method based on the measurement of the Double Ball Bar(DBB)is proposed.Firstly,based on multi-body system theory and homogeneous coordinate transformation method,the position-independent geometric error model of turntable-tilting head type five-axis machine tool position was established.Four measurement model based on circular path measurement were established according to the influence factors of geometric errors under different motion states of rotary axes,and10position-independent geometric errors were identified.Secondly,the numerical simulation was carried out by using the established geometric error model to quantify the influence of10geometric errors on the measurement trajectory of the rotary axes.Finally,the geometric error compensation was conducted to validate the validity of the proposed measurement and identification methods,and the measurement trajectories before and after the position-independent geometric error compensation were compared.The average compensation rate of the position-independent geometric errors of the10positions is70.4%,and the maximum compensation rate is88.4%.The experimental results show that the proposed modeling and identification method can be used to detect the accuracy of rotary axis,at the same time which can be used for the machine tool accuracy evaluation and provide the guidance for improving the accuracy.
作者
郭世杰
姜歌东
梅雪松
陶涛
GUO Shi-jie;JIANG Ge-dong;MEI Xue-song;TAO Tao(Shaanxi Key Laboratory of Intelligent Robots, Xi′an 710049, China;State Key Laboratory for Manufacturing System Engineering, Xi′an 710049, China;School of Mechanical Engineering, Xi′an Jiaotong University, Xi′an 710049, China)
出处
《光学精密工程》
EI
CAS
CSCD
北大核心
2018年第11期2684-2694,共11页
Optics and Precision Engineering
基金
长江学者和创新团队发展计划资助项目(No.IRT_15R54)
陕西省科技统筹创新工程计划项目-智能机器人公共科技服务平台建设资助项目(No.2015KTZDGY-02-01)
关键词
五轴机床
转动轴
位置无关几何误差
误差测量
误差辨识
five-axis machine tool
rotary axes
position-independent geometric error
error measurement
error identification
作者简介
郭世杰(1985-),男,内蒙古赤峰人,博士研究生,2010年、2013年于内蒙古工业大学分别获得学士、硕士学位,主要从事数控技术及精密机床等方面的研究。E-mail:zijianguoxjtu2015@163.com;导师:姜歌东(1971-),女,陕西咸阳人,博士,教授,博士生导师,教育部新世纪人才,1992年、1998年于西安交通大学分别获得学士、博士学位,主要从事机电系统动力学、精密机械及测量、激光加工机器人技术的研究。E-mail:gdjiang@mail.xjtu.edu.cn
