Planing is an important stage in its transformation. During this operation, the rough pieces ofwood are straightened and reduced to standardized dimensions. It is now important to increasethe operating speed of industrial planers. With this increase in speed, premature wear of theparts tends to increase, which affects the final quality of the planed timber.
This study focuses on the modeling and optimization of the input section of the planer. Thus,to optimize the system, it is necessary to know the planing forces. These forces will define thenormal load that the rollers must apply to the wood to propel it through the system and preventslippage. Three sub-objectives will make it possible to meet this main objective:
(1) Develop a complete dynamic model of the entrance section of a planer;
(2) Model the forces produced during planing of wood and apply them in point (1);
(3) Combine the model from point (1) with an optimization algorithm
The model produced with the help of FEM can predict the cutting forces generated duringlinear machining of wood. The objective is to determine both the forces and the trajectories ofthe cracks propagating in elastoplastic and anisotropic materials. The model combines abilinear representation of the strain-stress relationship of the material and the Hill elasticityfunction. The proposed procedure also integrates the displacement extrapolation method toevaluate the stress intensity factors. The validation phase compares the model predictions tothe experimental forces, matching levels of 91% and 92% are observed.
The dynamic model of the input section of a planing machine simulates the dynamic responseof the system during the passage of a board. The forces defined during planing are included.The system includes the model of an air balloon. In addition, the stiffness of the wood issimulated in 3D with a semi-infinite surface model. Damping is defined according to astructural damping model. Coupled with the PSO optimization algorithm, a 235 % decrease inresulting force as well as a 20.5% longer stabilization time is achieved. These reductionsshould lead to a significant increase in the life of the machine.
| Date | 22 Dec 2020 |
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| Original language | French |
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| Awarding Institution | - École de technologie supérieure
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| Supervisor | Raynald Guilbault (Supervisor) |
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Aboussafy, C. (Author),
Guilbault (Supervisor),
22 Dec 2020Student thesis: Master's thesis › Master in Engineering: Mechanical Engineering