Abstract
The wear of drills when processing wood-based boards is an important problem in industrial practice. The main objective of the study was to experimentally check whether two types of PVD coatings (multilayer nanocomposite “TiN/AlTiN” and double-layer coatings “TiAlN/a-C:N”) increase the wear resistance of the drill bits significantly (in terms of statistics). The typical two-blade drill bits intended for drilling in wood-based panels were used. During the experiments, the holes were drilled in samples made of commercial raw three-layer particleboard with the spindle speed of 4500 rpm, and the feed per revolution was 0.15 mm. The tool wear was monitored using a microscope. The advantage (greater resistance to wear) of both of the tested coatings (“TiN/AlTiN” and “TiAlN/a-C:N”) over raw cemented carbide was statistically significant in the initial period of machining (before 800 holes were drilled). Unfortunately, in the final period (when the number of holes drilled was over 800), only one coating (“TiN/AlTiN”) retained its advantage over raw cemented carbide. The effect of the second coating (“TiAlN/a-C:N”) turned out to be statistically insignificant.
Highlights
Increase the wear resistance of the drill bits significantly
The wear of cutting tools when processing wood-based boards is a significant problem in industrial practice
There is a close relationship between tool wear and product quality
Summary
Increase the wear resistance of the drill bits significantly (in terms of statistics). The tool wear was monitored using a microscope. The advantage (greater resistance to wear) of both of the tested coatings (“TiN/AlTiN” and “TiAlN/aC:N”) over raw cemented carbide was statistically significant in the initial period of machining (before 800 holes were drilled). The wear of cutting tools (including drills) when processing wood-based boards is a significant problem in industrial practice. The issue of reducing tool wear in woodworking is not simple. The mechanism of this wear progress is still not fully understood but what is well known is that it is absolutely different than what occurs in the case of metal cutting [8,9,10].
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