Utilisation of time-variant influence functions in the computer controlled polishing |
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Authors: | Markus Schinhaerl Rolf Rascher Richard Stamp Lyndon Smith Gordon Smith Peter Sperber Elmar Pitschke |
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Affiliation: | aUniversity of Applied Sciences Deggendorf, Edlmairstr. 6+8, 94469 Deggendorf, Germany;bUniversity of the West of England, Coldharbour Lane, Bristol, England |
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Abstract: | In the computer controlled polishing, a polishing tool moves in a well-defined manner across the workpiece surface in order to individually remove the surface error-profile. The commonly used technique to calculate the moving of the polishing tool is the dwell time method. Based on a constant (time-invariant) removal characteristic of the polishing tool (influence function) the amount of material to be removed is controlled via the dwell time. The longer the polishing tool is in contact with a particular area of the workpiece, the more material is removed at this position.Mathematical basics to calculate dwell time-profiles are shown, and a new approach considering time-variant influence functions for the computer controlled polishing is introduced. The results point out that time-variant influence functions may contribute to further decrease the process time, and thus to make a computer controlled polishing process more efficient. The reduction of the process time was observed to approximately 35% using a combination of the dwell time method with time-variant influence functions. |
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Keywords: | Computer controlled polishing Dwell time method Time-invariant influence function Time-variant influence function |
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