Abstract
Medium density fiberboard (MDF) is a wood based panel which main feature is the distribution of wood fibers, uniform and dense in the full panel thickness, allowing for very precise machining on the edges and in the faces of the board. However, and due to its manufacturing process, a density profile is produced with external layers being heavier than the core of the panel. These differences generate a variable surface quality across the panel when machined.
The tool characteristics and the cutting process kinematics also determine the resulting surface roughness of the processed material. With regard to the cutting energy, there are important variations when machining conditions are modified, or when some tool characteristics are changed.
The aim of this paper is to determine the cutting energy required to rip sawing MDF and to study its relationship with the resulting surface roughness across the panel profile when the density of the material changes.
The findings lead to the conclusion that there is a close relationship between cutting energy and surface roughness, being particularly sensitive to changes in specific gravity within the profile of the panel, and in particular to changes in cutting condition expressed as mean chip thickness.
Zusammenfassung
Mitteldichte Faserplatten (MDF) sind Holzwerkstoffplatten mit einheitlicher und dichter Verteilung der Holzfasern im gesamten Plattenquerschnitt. Dies ermöglicht eine sehr präzise Bearbeitung der Kanten und der Flächen der Platten. Jedoch entsteht aufgrund des Herstellungsverfahrens ein Dichteprofil, bei dem die äußeren Schichten dichter sind als die Mittelschicht. Diese Unterschiede haben zur Folge, dass bei der Bearbeitung die Oberflächenqualität der Schmalseiten variiert.
Die Werkzeugeigenschaften und die Kinematik des Schneidverfahrens haben ebenfalls Einfluss auf die Oberflächenrauheit des bearbeiteten Materials. Änderungen der Bearbeitungsbedingungen oder der Werkzeugeigenschaften führen zu signifikanten Unterschieden der Schneidenergie.
Ziel dieser Arbeit ist die Bestimmung der zum Längsschneiden von MDF benötigten Schneidenergie sowie die Untersuchung des Zusammenhangs mit der Oberflächenrauheit der Schmalseiten bei variierender Materialdichte.
Die Ergebnisse lassen den Schluss zu, dass zwischen der Schneidenergie und der Oberflächenrauheit ein enger Zusammenhang besteht. Einen besonders großen Einfluss haben die Variationen der Dichte im Plattenquerschnitt sowie die mittlere Spandicke als Maß der Schneidbedingungen.
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Acknowledgements
We would like to thank the wood science student Mr. Eder PARDO for his support and cooperation in the execution of the trials, data collection and sample preparation, which made possible this study; we also acknowledge the cooperation of the Direction of Research and Development (DID) of the Universidad Austral de Chile.
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Aguilera, A. Cutting energy and surface roughness in medium density fiberboard rip sawing. Eur. J. Wood Prod. 69, 11–18 (2011). https://doi.org/10.1007/s00107-009-0396-z
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DOI: https://doi.org/10.1007/s00107-009-0396-z