Abstract
Geometric error plays an important role that affecting the quasi-static accuracy of CNC machine tools. Aiming at the geometric error measurement and identification, plane-line based on Gross Grid Encoder (GGE) identification method was proposed. Based on multi-body system theory and homogeneous coordinate transformation method, the functional relationship between 21 geometric error and 3 error vectors of three-axis CNC machine tools was established. Three measurement paths and identification schemes in mutually perpendicular planes were planned. Through the single-axis motion and the two-axis synchronous motion, five straight lines in each plane were continuously measured to determine each geometric error in sequence. The impact of the accumulation of installation errors could be effectively reduced on the results during multiple installations. With the experiment of 21 geometric errors measurement and identification, the result showed that the maximum deviation of spatial error vector between the measurement result of plane-line and the laser interferometer result was 2.4 μm, and the average deviation was 0.77 μm, thus the effectiveness of the proposed method for identifying geometric error of machine tools was verified.
| Translated title of the contribution | Geometric error measurement and identification of machine tool based on gross grid encoder |
|---|---|
| Original language | Chinese (Traditional) |
| Pages (from-to) | 2037-2049 |
| Number of pages | 13 |
| Journal | Jisuanji Jicheng Zhizao Xitong/Computer Integrated Manufacturing Systems, CIMS |
| Volume | 26 |
| Issue number | 8 |
| DOIs | |
| State | Published - 1 Aug 2020 |