• 机械基础工程 •

### 五轴加工中心旋转轴几何误差元素区别建模辨识技术

1. 1.西南石油大学机电工程学院，成都，610500
2.中国工程物理研究院机械制造工艺研究所，绵阳，621900
3.四川普什宁江机床有限公司,都江堰，611830
• 出版日期:2021-03-10 发布日期:2021-03-17
• 基金资助:
四川省科技计划(2019ZDZX0021)；
四川省科技支撑计划(2017GZ0057)

### Distinct Modeling and Identification Technology for Rotary Axes Geometric Error Elements of Five Axis Machining Centers

ZHENG Hualin1;XIANG Xiping1;HU Teng1;MI Liang2;LIU Yan3

1. 1.School of Mechanical Engineering,Southwest Petroleum University,Chengdu,610500
2.Institute of Mechanical Manufacturing Process,China Academey of Engineering Physics,Mianyang,Sichuan，621900
3.Sichuan Push Ningjiang Machine Tool Group Co.,Ltd.,Dujiangyan,Sichuan，611830
• Online:2021-03-10 Published:2021-03-17

Abstract: It was critical to precisely identify the rotary axis position-dependent geometric error elements(PDGE) and position-indendent geometric error elements(PIGE) for constructing volumetric error models of five-axis machining centers. A five-axis machining center was taken as the research object, and a distinct modeling identification method was proposed for rotary axes PDGE and PIGE. Actual kinematic models of the rotary axes were firstly constructed by using multi-body system theory and homogeneous transformation matrix. The variations of the formed spatial vector Euclidean norms at the end of the two kinematic chains were then derived, according to which the essential equations for identifying rotary axes PDGE and PIGE were established, where the required parameters for solving the identification basic equation were obtained via double ball bar tests. Combining with the essential equations, the coupling mechanism of the rotary axes PDGE and PIGE were revealed, based on which an iterative method was proposed to accurately decouple the rotary axes PDGE and PIGE. Finally, in order to verify the method, a numerical verification strategy was presented and carried out on the basis of a virtual prototype. The simulation results show that the coupling issues between rotary axes PDGE and PIGE are resolved by the proposed identification method, thus providing accurate data support for constructing volumetric error model of five-axis machining centers.