Modélisation, simulation et optimisation du rendement au sciage des billes courbes

Abstract

The Cameroonian primary wood processing industries, in particular those of sawing, are characterized by a low yield estimated at less than 30%. Following the industrialization plan for the wood sector adopted in 2012, the reduction in material losses caused by sawing wood in our processing industries is one of the major issues for the establishment of further processing. This raises a problem of optimizing production, which involves planning sawing through simulations with debit patterns and using digital models. In order to provide a solution, this study on "modeling and simulating the cutting of curved logs" was carried out within the wood processing unit of the company DINO ET FILS SA located in Nkolfoulou, in the Center Region Cameroon. The main objective was to optimize the sawing performance of logs with a curvature defect by modeling and simulation methods. More specifically it was a question of modeling a curved ball; simulate its debitage by the use of debitage patterns and evaluate the impact of this method on the material yield. Inspired by the working methodology of Bouzinekis and Martin, data collected on a sample of 12 Tali beads (Erythrophleum ivorense) made it possible to establish a mathematical model based on the use of a parabola to represent the ball. The models obtained made it possible to automatically simulate the cutting of the logs. After designing the digital models of the logs and processing the data, an analysis of the results made it possible to establish the following conclusions: the simulation through the cutting diagrams leads to an increase in yield of more than 16% on average; the material yield in the case of sawing pieces of shorter lengths is always greater than that obtained in the case of products using their total lengths (maximum length). By comparing only, the flow rates obtained in the central plate, the volume obtained after cutting the ball is practically double (1.1 to 1.63 times) that obtained over the entire length. This coefficient decreases when we consider the products from the records. For the same end diameter, the number of pieces of maximum length is strongly influenced by the arrow, it grows in the opposite direction to it. However, this modeling method has limits because it only perfectly models logs with a total curvature of the trunk, and takes into account only one defect in curvature at a time.