In this paper, a new desktop NC machine tool, which has abilities of compliant motion and stick-slip motion, is first presented for finishing small metallic molds with curved surface. The NC machine tool consists of three single-axis robots with a high position resolution of 1μm. A thin wood stick tool is attached to the tip of the z-axis. The tool tip has a small ball-end shape. The control system is composed of a force feedback loop, position feedback loop and position feedforward loop. The force feedback loop controls the polishing force consisting of tool contact force and kinetic friction forces. The position feedback loop controls the position in pick feed direction, e.g., z-direction. The position feedforward loop leads the tool tip along a desired trajectory called cutter location data (CL data). The CL data are generated from the main-processor of a CAM system. The proposed NC machine tool has realized a compliant motion required for the surface following control along a spiral path. In order to improve the finishing performance, a small stick-slip motion control strategy is further added to the control system. The small stick-slip motion is orthogonally generated to the direction of the tool moving direction. Generally, the stick-slip motion is an undesirable phenomenon and should be eliminated in precision machineries. However, the proposed NC machine tool employs a small stick-slip motion to improve the finishing quality. The effectiveness of the NC machine tool was examined through an actual finishing test of a LED lens mold with a diameter of 4 mm. It was observed that the undesirable cusps can be removed uniformly. And, it was confirmed from the results that the proposed finishing strategy by using the stick-slip motion control is effective to achieve a higher quality surface like a mirror finishing.
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ASME 2009 InterPACK Conference collocated with the ASME 2009 Summer Heat Transfer Conference and the ASME 2009 3rd International Conference on Energy Sustainability
July 19–23, 2009
San Francisco, California, USA
Conference Sponsors:
- Electronic and Photonic Packaging Division
ISBN:
978-0-7918-4359-8
PROCEEDINGS PAPER
Desktop NC Machine Tool With Abilities of Compliant Motion and Stick-Slip Motion
Fusaomi Nagata,
Fusaomi Nagata
Tokyo University of Science, Yamaguchi, Sanyo-Onoda, Yamaguchi, Japan
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Shintaro Tani,
Shintaro Tani
Tokyo University of Science, Yamaguchi, Sanyo-Onoda, Yamaguchi, Japan
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Takanori Mizobuchi,
Takanori Mizobuchi
Tokyo University of Science, Yamaguchi, Sanyo-Onoda, Yamaguchi, Japan
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Keigo Watanabe
Keigo Watanabe
Saga University, Saga, Japan
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Fusaomi Nagata
Tokyo University of Science, Yamaguchi, Sanyo-Onoda, Yamaguchi, Japan
Shintaro Tani
Tokyo University of Science, Yamaguchi, Sanyo-Onoda, Yamaguchi, Japan
Takanori Mizobuchi
Tokyo University of Science, Yamaguchi, Sanyo-Onoda, Yamaguchi, Japan
Tetsuo Hase
Meiho Co. Ltd., Nogata, Japan
Zenku Haga
Meiho Co. Ltd., Nogata, Japan
Keigo Watanabe
Saga University, Saga, Japan
Paper No:
InterPACK2009-89042, pp. 211-217; 7 pages
Published Online:
December 24, 2010
Citation
Nagata, F, Tani, S, Mizobuchi, T, Hase, T, Haga, Z, & Watanabe, K. "Desktop NC Machine Tool With Abilities of Compliant Motion and Stick-Slip Motion." Proceedings of the ASME 2009 InterPACK Conference collocated with the ASME 2009 Summer Heat Transfer Conference and the ASME 2009 3rd International Conference on Energy Sustainability. ASME 2009 InterPACK Conference, Volume 1. San Francisco, California, USA. July 19–23, 2009. pp. 211-217. ASME. https://doi.org/10.1115/InterPACK2009-89042
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