Mesure des efforts de défonçage et de la qualité finale en usinant en différents angles du fil: Comparaison entre le pin Douglas et le pin d'Alep

The aim of this study was to compare a timber species commonly machined in Europe, in this case Douglas pine, with a little used timber species, in this case Aleppo pine from Algeria. A new method was developed to assess the cutting effort and the quality of the machined surfaces. The method was tested with Aleppo pine using a wood router held perpendicular to the surface and cutting continuously from 90°/0° to 90°/90° with or against the grain, so that the machining properties of the wood could also be assessed in comparison with other more commonly used timber species. The router bit, a rotary cutter with two carbide inserts, was used to bevel the edges of Aleppo pine discs cut from a board, which required the cutter to move continuously from an angle to the wood grain of 0° through to 360°. The cutting forces were measured using a 3-axis Kistler 9257A piezoelectric transducer fixed to the table of a digitally controlled router connected to a PC and a video capture board. The data were processed with Dasylab software. In parallel, the quality of the machined surfaces was tested with a tool where half of the cutting edge was new and the other half artificially blunted, using a new contact-free method developed by the CNR/ IVALSA research team. The results show that a little more cutting effort is required with Douglas pine than with Aleppo pine, and that the quality of the cut surfaces is far better with aleppo pine than Douglas pine.