Amélioration de la qualité et du rendement matière des sciages : cas des scies circulaires

Abstract : For many years, circular saws are more and more used in sawmills. Production imperatives, evolution of customer needs, technology progresses, make the sawmillers choose more and more often circular saws for rip sawing, though kerf losses in this case are higher than for bandsaw blades. So as to increase lumber yield, researches have been made in reducing kerf losses by decreasing saw body.width, which affects its rigidity, thus its stability. But circular saw vibrations are known to be the worst phenomenon during cutting. So we aim to find the best compromise between problems involved by kerf, saw stability, lumber yield improvement and sawing accuracy. First, we have studied research works made on static and dynamic behaviour, during idling or cutting, of circular saws. Thus, we have been able to identify the main parameters affecting saw stability, centrifugai forces, residual stresses from tensioning, blade temperature and lateral cutting forces. Then, we have introduced these parameters in a finite element analysis so as to compute the bending deflexion of circular saw. Finally, we have developed an experimental device, based on sorne units of an industrial edger, so as to validate this numerical work and face the industrial demand. Thus, in collaboration with a cutting tools manufacturer, we have been able to research the best conditions to prepare circular saws for a cutting process.
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Theses
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http://docnum.univ-lorraine.fr/prive/SCD_T_1997_0056_CHABRIER.pdf
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https://hal.univ-lorraine.fr/tel-01747425
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Submitted on : Thursday, March 29, 2018 - 10:59:42 AM
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Patrick Chabrier. Amélioration de la qualité et du rendement matière des sciages : cas des scies circulaires. Autre. Université Henri Poincaré - Nancy 1, 1997. Français. ⟨NNT : 1997NAN10056⟩. ⟨tel-01747425⟩

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