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Holz als Roh- und Werkstoff

, Volume 64, Issue 1, pp 37–44 | Cite as

Study washboarding phenomenon in frame sawing machines

  • Kazimierz OrlowskiEmail author
  • Roman Wasielewski
ORIGINALARBEITEN ORIGINALS

Abstract

The paper concerns washboarding phenomenon where for every kind of sawing a very regular pattern is characterised by a sinusoidal – like variation in board thickness. That pattern is an effect of the saw blade lateral vibrations. It is palpable that these vibrations are detrimental to the cutting process, and lead to poor surface quality and dimensional accuracy, and raw material waste.

For band saws in the contemporary literature models explaining a washboarding phenomenon are supported on self-excited (self-induced) vibration theories. However, these explanations cannot be simply broadened into the washboarding phenomenon in frame sawing machines. In this work based on theoretical and experimental investigation the washboard pattern formation is clarified by the authors with the use of a theoretical model, in which the rugged surface is an effect of vibrations generated by lateral cyclic loading and lagged wave formation. The authors hope that their obtained results contribute significantly to further understanding of this important but complicated phenomenon.

Keywords

Primary Motion Kerf Width Board Thickness Poor Surface Quality Lateral Cyclic Loading 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Zusammenfassung

Das vorliegende Manuskript beschäftigt sich mit dem Waschbrettschnitt, der beim Sägen entsteht und durch eine sinusartige Veränderung der Brettdicke gekennzeichnet ist. Die Ursache dafür sind seitliche Schwingungen des Sägeblattes. Es ist offensichtlich, dass diese Schwingungen dem Einschnittergebnis abträglich sind und zu schlechter Oberflächenqualität, Masshaltigkeit und Materialausnutzung führen.

In der jüngeren Literatur veröffentlichte Erklärungsmodelle für den Waschbrettschnitt bei Bandsägen, gehen von der Theorie sich selbst anregender Schwingungen aus. Diese Modellansätze können jedoch nicht ohne Weiteres auf Gattersägen übertragen werden. In der vorliegenden Arbeit wird das Entstehen eines Waschbrettschnittes auf der Grundlage theoretischer und experimenteller Untersuchungen mittels eines Modellansatzes erklärt, der unterstellt, dass die raue Oberfläche durch Schwingungen des Sägeblattes infolge einer seitlich-gerichteten, periodischen Beanspruchung und einer verzögerten Wellenbewegung entsteht. Die Autoren hoffen, dass die Ergebnisse dieser Untersuchung massgebend dazu beitragen, dieses wichtige, aber schwierige Phänomen besser zu verstehen.

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Copyright information

© Springer-Verlag 2005

Authors and Affiliations

  1. 1.Faculty of Mechanical Engineering, Department of Manufacturing Engineering and AutomationGdansk University of TechnologyGdanskPoland

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