Abstract
The wood processing industry seeks to reduce maintenance and production costs while increasing productivity and revenues accordingly. Improving the surface quality of wood in the first phase of transformation helps to maximize the use of wood fibers. Variable engineered micro-geometry was applied to teeth of guided circular saws used in a bull-edger system, and its effect on the surface quality of SPF (spruce-jack pine-balsam fir) boards was assessed. Trials were carried out on a test bench with two types of saw blades: saws with up-sharp tips without edge modification, and saws with modified cutting edges based on a waterfall profile. Cants were fed at the rate of 145 m/min for a cutting speed of 2600 rpm resulting in a nominal feed per tooth of 1.33 mm. Saws with three levels of wear (after 0, 255, and 900 min of working at a sawmill) processed the cants under frozen and unfrozen wood conditions. A total of 336 board samples were produced. Surface quality of boards was assessed using standard parameters of roughness and waviness. The results revealed that the saw with modified waterfall edge profile showed better performance in terms of wood surface finish and wear rate due to the variable engineered micro-geometry. Frozen cants had a better surface finish. Roughness and waviness parameters were sensitive to changes in wear of tips.
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Acknowledgements
The authors hereby thank Luc Germain, Daniel Bourgault, Félix Pedneault, Claudia Cáceres Cuadros, Simon Paradis-Boies, and Antoine Henry for their technical assistance. Thanks to Bruce Lehmann from FPInnovations for his guidance. In addition, the authors are grateful to Irsan Alipraja who was always ready to give his time during this study. The authors would also like to thank Bois Daaquam Sawmill (Division St-Pamphile) as an industry participant for their valuable cooperation.
Funding
The financial support for this project was provided by Natural Sciences and Engineering Research Council of Canada (NSERC) and FPInnovations through a Cooperative Research and Development grant (project #CRDPJ-518967-17).
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MT performed the tests summarized in the document and wrote the manuscript. WS performed the modifications to the geometry of cutting edge of the WC-Co carbide tips. BU, RG, RH and CB assisted in supervising the empirical work of MT and provided assistance for data analysis. All authors reviewed the manuscript.
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Torkghashghaei, M., Shaffer, W., Georges, R. et al. Effect of variable engineered micro-geometry of the cutting edges of circular saws on the surface quality of SPF boards. Eur. J. Wood Prod. 81, 1261–1276 (2023). https://doi.org/10.1007/s00107-023-01961-4
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DOI: https://doi.org/10.1007/s00107-023-01961-4