Popis: |
The feedrate along a tool path is directly related to the path curvature. High-curvature sections in tool paths are caused by complex part geometry, data noise, and discontinuities in the model. Highcurvature sections cause the NC machine to reduce the feedrate along the tool path due to acceleration and jerk limits. Reduced feedrates increase machining time and decrease production rates. This paper presents new methods to decrease curvature on tool paths represented by splined Bezier curves, within a tolerance band, thereby increasing production rates for complex surface machining. In sample cases the algorithm decreased machining times by 1% to 9% for sections of high curvature and by 16% to 75% for CAM induced ripples. |