On the cutting performance of diamond-coated cemented carbide tools pretreated with Murakami/H2O2-H2SO4 solution

In this study, substrate surface pretreatment using Murakami/H2O2-H2SO4 sol ution was investigated as a method for improving the cutting performance of diamond-coated cemented carbide tools. Cutting performance of the coated t ools with Murakami/H2O2H2SO4 and sand-blasting/HCl-HNO3 pretreatments and a n uncoated tool were examined in the continuous milling of medium density f iberboard, melapi (Shorea spp.), and western redcedar (Thuja plicata D. Don ). Substrate surface pretreatment with Murakami/H2O2-H2SO4 resulted in a co nsiderable reduction of the initial edge dullness and edge roughness of the coated tool as compared to those obtained by utilizing the sand-blasting/H Cl-HNO3 pretreatment method. As a result, cutting-power consumption for the Murakami/H2O2-H2SO4 tools was considerably lower than the sand-blasting/HC l-HNO3 sandblasting pretreatment and at an approximately similar level as t he uncoated tool, especially in the cutting of melapi. Delamination of the diamond film did not occur for any of the coated tools when cutting solid w oods. Tn the case of cutting medium density fiberboard, the coated tools wi th Murakami/H2O2-H2SO4 pretreatment exhibited far less delamination than th e coated tools with sand-blasting/HCl-HNO3 pretreatment.