Research and implementation of NURBS interpolator with continuous feedrate for high-speed machining.
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| Title: | Research and implementation of NURBS interpolator with continuous feedrate for high-speed machining. |
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| Authors: | Zhou, Huicheng1 (AUTHOR), Wu, Jichun1 (AUTHOR) wujichun888@gmail.com, Tang, Xiaoqi1 (AUTHOR), Chen, Jihong1 (AUTHOR) |
| Source: | International Journal of Production Research. Nov2012, Vol. 50 Issue 22, p6457-6468. 12p. 2 Color Photographs, 2 Black and White Photographs, 7 Diagrams, 2 Charts, 4 Graphs. |
| Subjects: | Computer-aided design, Programming of numerically controlled machine tools, Machining, Interpolation, Splines, Mathematical models, Manufacturing processes, Equipment & supplies |
| Abstract: | Using non-uniform rational B-splines (NURBS) rather than piecewise lines and arc segments as a toolpath makes it much easier to achieve high-speed control in die and mould machining. When NURBS is used as a toolpath, two issues must be solved. The first is how to convert the discrete cutter location (CL) data offset from a CAD model into a NURBS curve. The second is how to maintain low velocity fluctuation while interpolating the NURBS curve with limited calculation time. This study proposes a NURBS toolpath generation method from line segments and a real-time NURBS interpolator for CNC machines to achieve the goal of high-speed machining. A CL data simplification method with shape holding is presented based on identifying and correcting the defect point from the original CL data, and removing redundant CL data within shape-maintaining requirements. Then the conversion of all simplified CL data to NURBS curves is done by applying NURBS fitting or interpolation with optional directional constraints. A precise method based on nonlinear mapping between the NURBS's parameter and arc length is proposed and implemented to obtain a continuous feedrate and machining quality. The simulation performed on CL points for a wave surface demonstrates that the proposed approach reduces the NC blocks to 6% while staying within the tolerance of deviation. The machining experiment shows that the proposed approach can increase machining quality while reducing machining time by about 22%. [ABSTRACT FROM PUBLISHER] |
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| Database: | Engineering Source |
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| Abstract: | Using non-uniform rational B-splines (NURBS) rather than piecewise lines and arc segments as a toolpath makes it much easier to achieve high-speed control in die and mould machining. When NURBS is used as a toolpath, two issues must be solved. The first is how to convert the discrete cutter location (CL) data offset from a CAD model into a NURBS curve. The second is how to maintain low velocity fluctuation while interpolating the NURBS curve with limited calculation time. This study proposes a NURBS toolpath generation method from line segments and a real-time NURBS interpolator for CNC machines to achieve the goal of high-speed machining. A CL data simplification method with shape holding is presented based on identifying and correcting the defect point from the original CL data, and removing redundant CL data within shape-maintaining requirements. Then the conversion of all simplified CL data to NURBS curves is done by applying NURBS fitting or interpolation with optional directional constraints. A precise method based on nonlinear mapping between the NURBS's parameter and arc length is proposed and implemented to obtain a continuous feedrate and machining quality. The simulation performed on CL points for a wave surface demonstrates that the proposed approach reduces the NC blocks to 6% while staying within the tolerance of deviation. The machining experiment shows that the proposed approach can increase machining quality while reducing machining time by about 22%. [ABSTRACT FROM PUBLISHER] |
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| ISSN: | 00207543 |
| DOI: | 10.1080/00207543.2011.651170 |
