Two Methods to Effectively Reduce Nonlinear Errors in Five-axis CNC Systems
[1]CHEN Liangji..Two Methods to Effectively Reduce Nonlinear Errors in Five-axis CNC Systems[J].Journal of Zhengzhou University (Engineering Science),2009,30(02):107-111.
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Journal of Zhengzhou University (Engineering Science)[ISSN
1671-6833/CN
41-1339/T] Volume:
30
Number of periods:
2009年02期
Page number:
107-111
Column:
Public date:
1900-01-01
- Title:
- Two Methods to Effectively Reduce Nonlinear Errors in Five-axis CNC Systems
- Keywords:
- Computer numerical control; five-axis linear interpolation; knife tip trajectory; Nonlinearity error
- CLC:
- -
- DOI:
- -
- Abstract:
- Aiming at the problem of nonlinear error in the movement of the tool tip due to the swing of the tool in five-axis numerical control (CNC) machining, a mathematical model of the error is established, and two methods to effectively reduce the error are proposed: the first method imputes the ideal linear tool tip trajectory instead of the data given by the NC program segment, and performs coordinate transformation on the interpolation point to calculate the motion control command output by the interpolator; The second method directly imputes the NC program segment, but projects the tool tip point corresponding to the point onto the ideal tool tip trajectory, transforms the projection point into coordinates, and coordinates the motion coordinates of each axis of the computer bed. Example calculations show that the proposed method can reduce the nonlinear swing error to less than 1μm, and the calculation time (35.6μs) can meet the real-time requirements of the numerical control system.
- References:
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- Similar References:
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Last Update:
1900-01-01