Specific wear on the rake face made of sintered carbide cutting edge during milling of laminated wood

Abstract

An attempt to assess recesses on the rake face after milling wood laminated with polyvinyl acetate (PVA) based glue is presented. Several analytical methods were employed to explain tribo chemical corrosion reactions (TCCR) leading to formation of specific form of wear on the rake face. By means of thermal gravimetric analysis it was confirmed that cobalt and tungsten carbide—main components of sintered carbide cutting edge—were subjected to intensive TCCR. Although an increase in thermal stability of the PVA based glue after modification was evidenced, high temperature degradation of the glue to acetic acid was probably the primary source of TCCR. Catastrophic wear of the cemented carbide cutting edge was also evidenced as the final state of continuous deepening of the recess on the rake face near the cutting edge.