Clearance wear and normal force of TiN-coated P30 in cutting hardboards and wood-chip cementboards

This paper presents the clearance wear and normal force characteristics of TiN coated P30 when cutting hardboards and wood-chip cement boards. Hardboards and wood-chip cement boards of low density (about 0.8 g/cm³) and high density (about 1.2 g/cm³) were cut by using TiN coated P30. Cutting tests were performed at a cutting speed of 1000 m/min and a feed rate of 0.1 mm/rev to investigate the effect of the work materials on the clearance wear and normal force characteristics of the TiN coated P30. The experimental results showed that the TiN coated P30, compared to uncoated P30, is more advantageous in reducing the progression of wear on the clearance face, and in retaining lower normal force in cutting both hardboards and wood-chip cement boards. The amount of clearance wear suffered by the TiN coated P30 for the wood-chip cement board was larger compared to that for the hardboard. Though the TiN coated P30 suffers higher wear for the low density wood-chip cement board than the low density hardboard, its normal force, however, is always lower for the low density wood-chip cement board. It was observed that the clearance wear of the TiN coated P30 occurs due to delamination of TiN film and the wear of the substrate occurs after the coating film was disappeared from the substrate.