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Subjects/Areas/Topics:CAGD/CAD/CAM Systems
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Computer Vision, Visualization and Computer Graphics
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Geometry and Modeling

Abstract: Automated machining with 5-axis robots require the generation of tool paths in form of positions of the tool
tip and orientations of the tool at each position. Such a tool path can be described in form of two curves, one
for the positional information and one for the orientational information, where the orientation is given by the
vector that points from a point on the orientation curve to the respective point on the position curve. As the
robots need to slow down for sharp turns, i.e., high curvatures in the tool path lead to slow processing, our goal
is to generate tool paths with minimized curvatures and a guaranteed error bound. Starting from an initial tool
path, which is given in form of polygonal representations of the position and orientation curves, we generate
optimized versions of the curves in form of B-spline curves that lie within some error bounds of the input path.
Our approach first computes an optimized version of the position curve within a tolerance band of the input
curve. Based on this first step, the orientation curve needs to be updated to again fit the position curve. Then,
the orientation curve is optimized using a similar approach as for the position curve, but the error bounds are
given in form of tolerance frustums that define the tolerance in lead and tilt. For an efficient optimization
procedure, our approach analyzes the input path and splits it into small (partially overlapping) groups before
optimizing the position curve. The groups are categorized according to their geometric complexity and handled
accordingly using two different optimization procedures. The simpler, but faster algorithm uses a local spline
approximation, while the slower, but better algorithm uses a local sleeve approach. These algorithms are
adapted to both the position and orientation curve optimization. Subsequently, the groups are combined into a
5-axis tool path in form of two G2-continuous B-spline curves over the same knot vector.(More)

Automated machining with 5-axis robots require the generation of tool paths in form of positions of the tool tip and orientations of the tool at each position. Such a tool path can be described in form of two curves, one for the positional information and one for the orientational information, where the orientation is given by the vector that points from a point on the orientation curve to the respective point on the position curve. As the robots need to slow down for sharp turns, i.e., high curvatures in the tool path lead to slow processing, our goal is to generate tool paths with minimized curvatures and a guaranteed error bound. Starting from an initial tool path, which is given in form of polygonal representations of the position and orientation curves, we generate optimized versions of the curves in form of B-spline curves that lie within some error bounds of the input path. Our approach first computes an optimized version of the position curve within a tolerance band of the input curve. Based on this first step, the orientation curve needs to be updated to again fit the position curve. Then, the orientation curve is optimized using a similar approach as for the position curve, but the error bounds are given in form of tolerance frustums that define the tolerance in lead and tilt. For an efficient optimization procedure, our approach analyzes the input path and splits it into small (partially overlapping) groups before optimizing the position curve. The groups are categorized according to their geometric complexity and handled accordingly using two different optimization procedures. The simpler, but faster algorithm uses a local spline approximation, while the slower, but better algorithm uses a local sleeve approach. These algorithms are adapted to both the position and orientation curve optimization. Subsequently, the groups are combined into a 5-axis tool path in form of two G2-continuous B-spline curves over the same knot vector.

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Selinger, E. and Linsen, L. (2018). Efficient Curvature-optimized G2-continuous Path Generation with Guaranteed Error Bound for 5-axis Machining. In Proceedings of the 13th International Joint Conference on Computer Vision, Imaging and Computer Graphics Theory and Applications - GRAPP, ISBN 978-989-758-287-5; ISSN 2184-4321, SciTePress, pages 59-70. DOI: 10.5220/0006537400590070

@conference{grapp18, author={Evgenia Selinger. and Lars Linsen.}, title={Efficient Curvature-optimized G2-continuous Path Generation with Guaranteed Error Bound for 5-axis Machining}, booktitle={Proceedings of the 13th International Joint Conference on Computer Vision, Imaging and Computer Graphics Theory and Applications - GRAPP,}, year={2018}, pages={59-70}, publisher={SciTePress}, organization={INSTICC}, doi={10.5220/0006537400590070}, isbn={978-989-758-287-5}, issn={2184-4321}, }

TY - CONF

JO - Proceedings of the 13th International Joint Conference on Computer Vision, Imaging and Computer Graphics Theory and Applications - GRAPP, TI - Efficient Curvature-optimized G2-continuous Path Generation with Guaranteed Error Bound for 5-axis Machining SN - 978-989-758-287-5 IS - 2184-4321 AU - Selinger, E. AU - Linsen, L. PY - 2018 SP - 59 EP - 70 DO - 10.5220/0006537400590070 PB - SciTePress

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