Abstract
Position-dependent geometric errors (PDGEs) of rotary axis affect the accuracy of the multi-axis machine tool. However, many PDGE identification methods were not general enough and not applicable when the structure of the machine tool was limited or changed. In this paper, a general PDGE identification method with single-axis driven was proposed. Firstly, the comprehensive length change model of the double-ball bar (DBB) was established. The simplification was conducted through the constraint condition to obtain the identification matrix. Then, the effect of the installation errors of the DBB was analyzed and eliminated. Simulations were carried out to validate the correctness of the proposed method when considering the installation errors. Next 10 measurement patterns were determined according to the structure limitation of the small-size 5-axis machine tool. Totally 364 combinations with full rank identification matrix are available. Finally, the prediction experiments and analysis for standard deviation were conducted to further validate the effectiveness of the proposed method. It turned out that the small condition number of the identification matrix can more likely achieve high accuracy. And an improved combination using 5 patterns was proposed with the same accuracy achieved compared to that using a total of 10 patterns.
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Data availability
The datasets used or analyzed during the current study are available from the corresponding author on reasonable request.
Abbreviations
- PDGEs:
-
Position-dependent geometric errors
- PIGEs:
-
Position-independent geometric errors
- DBB:
-
Double-ball bar
- MADM:
-
Multi-axis driven method
- SADM:
-
Single-axis driven method
- P 0(x w, y w, z w):
-
Initial position of the workpiece ball center
- P i(x i, y i, z i):
-
Theoretical position of the workpiece ball center
- P(x, y, z):
-
Actual position of the workpiece ball center
- Q(x t, y t, z t):
-
Position of the tool ball center
- T i :
-
Theoretical motion transformation matrix
- T :
-
Actual motion transformation matrix
- Δx, Δy, Δz :
-
Deviation components of the workpiece ball center
- E XC, E YC, E ZC :
-
Translational PDGEs of C-axis along X-, Y-, and Z-axes
- E AC, E BC, E CC :
-
Angular PDGEs of C-axis around X-, Y-, and Z-axes
- E XOC, E YOC :
-
Translational PIGEs of C-axis along X- and Y-axes
- E AOC, E BOC :
-
Angular PIGEs of C-axis around X- and Y-axes
- r :
-
Standard radius of double-ball bar
- Δr :
-
Length change of the DBB considering the PDGEs
- ΔR :
-
Length change of the DBB considering the PDGEs, PIGEs, and installation error
- E :
-
PDGEs in matrix form
- K :
-
Identification matrix
- Δr :
-
Length change in matrix form
- δ xt, δ yt, δ zt :
-
Installation errors on the side of tool ball
- δ xw, δ yw, δ zw :
-
Installation errors on the side of workpiece ball
- E(pre):
-
Pre-set PDGEs in the simulation
- E(set):
-
PDGEs set in the simulation
- E(cal):
-
PDGEs calculated
- E(ref):
-
PDGEs referred
- σ:
-
Standard deviations of identified PDGEs
- m :
-
Measurement times
- n :
-
Total number of measured points
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Funding
This work was supported by the National Key Research and Development Program of China (No. 2019YFB1703700).
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Kai Xu proposed the identification method and wrote the manuscript. Guolong Li contributed significantly to analysis and manuscript preparation. Zheyu Li performed the experiment. Xin Dong helped perform the analysis with constructive discussions. Changjiu Xia performed the data analyses.
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Xu, K., Li, G., Li, Z. et al. A general identification method for position-dependent geometric errors of rotary axis with single-axis driven. Int J Adv Manuf Technol 112, 1171–1191 (2021). https://doi.org/10.1007/s00170-020-06530-0
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DOI: https://doi.org/10.1007/s00170-020-06530-0