###### Abstract  
Reduced performance of circular saws due to premature chipping of their teeth has been a critical issue in woodcutting industry for many years. This research examined the impact of surface coating and variable engineered micro-geometry of the cutting edges of carbide teeth (tips) on the wear resistance of circular saws used in primary wood processing. CrN/CrCN/DLC, CrN/AITN, CrN/CrCN, and CrCN/TISiCN were deposited on tungsten carbide-cobalt (WC-Co) substrates using the cathodic arc evaporation technique. The CrN/CrCN coating proved to be the one with highest wear resistance and adhesion among those studied. No sign of delamination was observed around the indentation of the CrN/CrCN coating after the adhesion test. Furthermore, no abrasion, delamination or crack was observed on the surface of the CrN/CrCN coating after the three-body abrasion wear test. The results of the dry-sliding wear test revealed that CrN/CrCN coating significantly decreased the wear rate of WC-Co substrates by 74%, 66% and 77% at sliding speeds of 50, 100 and 250 mm/s, respectively. Afterwards, a CrC/CrCN coating was deposited on the teeth of conventional circular saws. Next, the cutting edges of teeth were modified through variable engineered micro-geometry. Tests were conducted at a sawmill with three series of saws: 1-coated and edge-modified, 2-coated and conventional edge geometry, and 3-uncoated and edge-modified. Wood processing was performed during two shifts of 480 min each. The width of the wear land was the criterion used as the wear index. The results of industrial tests showed that saws with edge-modified teeth had significantly less chipping and no breakage at their corners compared to the saw without edge modification (conventional saw). After 480 min of sawing, the wear rate of the coated saw with edge modification decreased by 46% and 16%, compared to the coated saw without edge modification and the uncoated saw with edge-modified teeth, respectively. Those values reached 73 % and 41%, respectively, after 960 min of sawing. The study shows that by optimizing the surface chemistry and the geometry of the cutting edge of WC-Co tips, tool life can be significantly increased therefore reducing downtime due to saw replacement and resharpening, thus significantly increasing productivity in the first transformation of wood. circular saw; PVD coating; cutting edge modification; wear +
Footnote †: journal: Applied Sciences  
on the wood sawing industry to maximize utilization of the wood fiber, it becomes critical to develop cutting tools that are significantly more resistant to wear in order to minimize sawing variation and generation of waste. Circular saws are commonly used in the first and second transformations of wood. Their performances are primarily determined by the wear resistance of their cutting edges made of WC-Co inserts brazed onto the steel body of the saw. Many factors influence the wear of saws including tool geometry, cutting parameters (cutting speed, feed speed, etc. ), and workpiece conditions (wood species, moisture content, temperature, wood density, knottiness, etc.) [2]. Circular saws require periodic resharpening and/or replacement of carbide tips throughout their useful life. The cost of these operations can be minimized by improving the wear resistance of the carbide tips [3]. In addition, as tool wear increases, sawing variations increase as well, requiring that a larger volume of wood be removed in subsequent sawing operations such as planing. The microgeometry of the cutting edge significantly impacts temperature distribution, the surface quality of the workpiece as well as tool life [4]. According to [PERSON] et al. [5], sharp-edged tools mostly present a high level of wear, especially near their sharp corners. As a result, optimization of the cutting edge geometry is essential to mitigate the chipping and fracture issues.