Feedrate Fluctuation Minimization for NURBS Tool Path Interpolation Based on Arc Length Compensation and Iteration.
Xing Liu1, Pengxin Yu2, Haiduo Chen2
1School of Future Science and Engineering, Soochow University, Suzhou 214400, China.
Micromachines
|April 26, 2025
Summary
This study introduces a new method to minimize feedrate fluctuation in NURBS tool path interpolation for CNC machining. The approach enhances machining quality and axis control by precisely calculating interpolation points in real-time.
Area of Science:
- Manufacturing Engineering
- Computer-Aided Manufacturing
- Robotics and Control Systems
Background:
- Real-time parametric interpolation is vital for high-speed, high-precision multi-axis CNC machining.
- Positioning errors in interpolation points cause feedrate fluctuations, degrading machining quality and stressing axis drives.
Purpose of the Study:
- To propose a computationally efficient and precise method for minimizing feedrate fluctuation during NURBS tool path interpolation.
- To improve machining quality and axis drive performance in CNC milling.
Main Methods:
- Developed a model relating arc length and curvature to the NURBS tool path parameter.
- Implemented an arc length compensation method to reduce deviations between theoretical and actual step lengths.
- Utilized Newton iteration to correct interpolation points and restrict feedrate fluctuations within a set accuracy threshold.
Main Results:
- The proposed method effectively minimizes feedrate fluctuation in NURBS interpolation.
- Arc length compensation and Newton iteration significantly improve interpolation point accuracy.
- Simulations and milling experiments validated the method's effectiveness and superiority.
Conclusions:
- The developed feedrate fluctuation minimization method enhances CNC milling precision and quality.
- The approach offers a computationally efficient solution for real-time interpolation challenges.
- This technique addresses critical issues in achieving high-performance multi-axis CNC machining.
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