High-efficiency and High-precision Machining of Difficult-to-machine Materials by PVD Coated Tools (2nd Report)

—Film Properties and Cutting Temperature of Free-Carbon Containing TiCN-Coated End Mills deposited by UBMS—

Abstract

The TiCN coating film containing free carbon deposited by UBMS (U-TiCN) is applied to the end mills and some kinds of such tools are used in high-speed milling of SUS304. This coating film is designed to improve lubricating ability rather than heat resistance. U-TiCN coating film including many free carbons has smooth surface and low coefficient of friction. Following the 1st report, film properties and cutting temperature of U-TiCN coating film are examined. U-TiCN oxidizes at 500°C lower than TiN and TiAlN. FE-TEM (Field Emission Scanning Electron Microscope) analysis reveals that the U-TiCN coating film forms the fine crystallization rather than generally TiCN coating film without free carbons. Lower cutting temperature is obtained with these U-type TiCN-coated tools than the ordinary AIP-coated tools in high-speed side milling without coolant.