Analyse et modélisation du fraisage du bois vert.

Abstract : In sawmills, logs are faced with conical rough milling cutters (slabber or canter heads). The chips produced during this operation are segmented in small chips, consisting of raw material for different sectors (pulp paper, particleboards and energy). Their valuation of paper pulp, which is the most remunerative outlet for these related products, requires a respect of defined particle size. This dimensional control requires a better knowledge of the chip fragmentation mechanisms. To this end, we conducted an experimental campaign of orthogonal cutting for green wood in order to study the influential parameters on chips dimensions and to define good chipping areas. The results of this study will be used as indicators to compare numerical simulations of fragmentation with reality. To help machine tool designers to better design their equipment, we have developed a fully customizable slabber. With this model, we studied the effect of slabber geometric and kinematic parameters on certain key variables in machining. Numerical simulation of the fragmentation of green wood chips should help to predict the size of chips formed. To this aim it is necessary to use a method taking into account the specificities of wood cutting. Here the relevance of the Discrete Elements Method (DEM) is studied. Finally to achieve quantitative simulations, the behavior of green wood in compression under dynamic conditions is studied.
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Renaud Pfeiffer. Analyse et modélisation du fraisage du bois vert.. Génie des procédés. Ecole nationale supérieure d'arts et métiers - ENSAM, 2015. Français. ⟨NNT : 2015ENAM0032⟩. ⟨tel-01345212⟩

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