Effect of Tool Tip Radius on ring Debarker Performance

The effects of the tool tip radius on debarking quality unfrozen and frozen black spruce logs were studied. power, energy consumption torque conditions also A proto-type one-arm ring debarker was used. experiment consisted using three radii (40, 180, 300 µm) for each temperature (-20°C +20°C). rotational feed speeds, overlap, rake angle kept constants. Debarking evaluated by two criteria: proportion bark remaining log surfaces amount wood in residues (WIB). Log characteristics, used as covariates, ie dimensions, eccentricity, thickness, knot features, bark/wood shear strength (BWSS), basic densities moisture contents sapwood measured, well total removed material after debarking. results showed that had a significant effect logs. increased WIB decreased increased. At same applied radial force, wider shallower penetration leaving bigger regions surfaces. In contrast, narrower deeper resulting important fiber tear-out. thickness inner MC affected quality. mean torque, decreased. However, this will depend choice force during Motor performance material, diameter, BWSS. Overall, highlight importance choosing an adequate combination to obtain most profitable with efficient consumption.