Bending and indentation tests to determine chipboards' mechanical strength critical stresses and their correlation to the specific cutting force in milling

The determination of particleboard (chipboard) mechanical strength critical stresses and their correlation to a specific cutting force in chipboard milling are introduced. This correlation is based on bending and indentation tests, on a finite elements method (FEM) simulation of the chip formation and flow mechanism in chipboard milling, as well as on cutting force components measurements. The obtained results, by means of these procedures, were used to verify the FEM calculated milling force time course and to explain the chip formation and the cutting force fluctuation. Moreover, owing to these results, the experimentally and analytically determined chipboard and layer elasticity, as well as small and large scale plasticity strength values, were correlated to the corresponding specific cutting force, considering concrete cutting edge revolving positions during milling. In this way, chipboard materials strength critical stresses can be determined automatically, taking into account their correlation to the specific cutting force, individually defined through cutting force components measurements. The developed procedure can be used beneficially in monitoring the mechanical strength properties of chipboards under production conditions.