An optimal curvature-smooth transition algorithm with axis jerk limitations along linear segments

An optimal curvature-smooth transition algorithm with axis jerk limitations along linear segments Linear toolpath is generated by commercial computer-aided manufacturing (CAM) systems and it is most popular in computer numerical control (CNC) systems. Considering the discontinuity between two neighbor linear segments, corner feedrate is restricted and axis accelerations and jerks always exceed the given limitations, leading to low efficiency and poor accuracy, respectively. To overcome these two drawbacks, a novel curvature-smooth optimal transition algorithm and a jerk-continuous feedrate-scheduling scheme with axis jerk limitations are proposed in this paper. Firstly, based on the theoretical feedrate constraints with bounded axis accelerations and jerks, a quintic B-spline curve is adopted to generate curvature-smooth toolpath. To improve machining efficiency, corner feedrate is regarded as the optimal objective to determine the transition B-spline curve. Afterwards, considering the curvature-smooth toolpath, a corresponding five-phase jerk-continuous feedrate profile is provided to achieve higher machining precision. Finally, compared with curvature-continuous toolpath in simulations and experiments, the proposed algorithms can bound the axis kinematic parameters as expected and have advantages on improving machining precision especially under high kinematic limitations. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png The International Journal of Advanced Manufacturing Technology Springer Journals

An optimal curvature-smooth transition algorithm with axis jerk limitations along linear segments

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Publisher
Springer London
Copyright
Copyright © 2017 by Springer-Verlag London Ltd.
Subject
Engineering; Industrial and Production Engineering; Media Management; Mechanical Engineering; Computer-Aided Engineering (CAD, CAE) and Design
ISSN
0268-3768
eISSN
1433-3015
D.O.I.
10.1007/s00170-017-1274-1
Publisher site
See Article on Publisher Site

Abstract

Linear toolpath is generated by commercial computer-aided manufacturing (CAM) systems and it is most popular in computer numerical control (CNC) systems. Considering the discontinuity between two neighbor linear segments, corner feedrate is restricted and axis accelerations and jerks always exceed the given limitations, leading to low efficiency and poor accuracy, respectively. To overcome these two drawbacks, a novel curvature-smooth optimal transition algorithm and a jerk-continuous feedrate-scheduling scheme with axis jerk limitations are proposed in this paper. Firstly, based on the theoretical feedrate constraints with bounded axis accelerations and jerks, a quintic B-spline curve is adopted to generate curvature-smooth toolpath. To improve machining efficiency, corner feedrate is regarded as the optimal objective to determine the transition B-spline curve. Afterwards, considering the curvature-smooth toolpath, a corresponding five-phase jerk-continuous feedrate profile is provided to achieve higher machining precision. Finally, compared with curvature-continuous toolpath in simulations and experiments, the proposed algorithms can bound the axis kinematic parameters as expected and have advantages on improving machining precision especially under high kinematic limitations.

Journal

The International Journal of Advanced Manufacturing TechnologySpringer Journals

Published: Nov 4, 2017

References

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