An Alternative Method of Coating Carbide Tools
A method of coating cemented carbide tools with ceramics is proposed. Two types of coated tool, each of which has a narrow band of exposed cemented carbide substrate along the cutting edge on the rake face were made. TiN coating by PVD and TiC by CVD were employed. The TiN coated tool with 50 um wide uncoated band performed very well at cutting speed of 4 m/s or less in intermittent cuttings and at 7.5 m/s or more in unstable continuous cutting. In these ranges tool life was improved 3 to 6 times longer than that of a conventionally fully coated tool. SEM observation showed that the proposed coating has no breakable layer at the edge, hardly damages the edge and thus lasts longer.
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