Modeling for orientation deviation of workpiece and analysis of machining accuracy

作者：He Gaiyun^*; Yang Baolong; Zheng Huijiang; Jia Hongyang

来源：Transactions of Tianjin University, 2011, 17(5): 324-328.

DOI：10.1007/s12209-011-1647-8

• Co-ordinate system
• Dimensional precision
• Fixture manufacturing
• Inclination errors
• Least square methods
• Machining accuracy
• Real time
• Shape precision
• Spatial coordinates
• Verification systems
• Work pieces

The machining accuracy of workpiece is influenced by its orientation deviation, which is caused by the fixture-workpiece error. Based on the spatial coordinate theory, the orientation deviation of workpiece is measured by using an on-machine verification system, which can take into account the errors resulting from fixture manufacturing, installation and adjustment, location and clamping of workpiece. According to the least square method, the model of orientation deviation is built to determine the relationship between the theoretical and actual coordinate systems. The influence of orientation deviation on machining accuracy is quantified, and it is shown that the orientation deviation only affects the dimensional precision and position precision, rather than shape precision. In the experiment, the compensation processing of realtime errors was conducted, and the perpendicularity and inclination errors of the tetragonal part were reduced by 38.46% and 47.06%, respectively.

• 出版日期2011
• 单位天津大学