Abstract

Chipper-canters are used in primary wood industries for processing small-diameter logs. Knife geometry is one of the principal parameters significantly affecting the chip size and cant surface properties. This work studied the patterns of tool wear as edge recession (ER) in chipping and canting knives of a chipper-canter head. In addition, analytical investigation of wear mechanisms was carried out to better understand the ER phenomenon. The test head contained eight sets of separate chipping and canting knives. ER was measured after 0, 8, 16, 32, 48, and 80 hours of machining. Microscopic measurements at intervals of 1 mm along the cutting edge were carried out to characterize ER from knife replicas. The ERs after 80 hours of machining were 544 and 549 μm for chipping and canting knives, respectively. There was no significant variation in ER between the types of knives at 0 and 80 hours of machining. However, significantly different ERs were found between the chipping and canting knives at the intermediate stages of machining. Scanning electron microscopic observation showed that apart from abrasion and chipping phenomenon, there were also deformation of chipping knives and cracking of canting knives.

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