Mechanical properties and cutting performance of Cr-Al-N hybrid coated micro-tool for micro high-speed machining of flexible fine die (Conference Paper)

摘要

In this paper, comparative studies on mechanical properties and cutting performance between CrN and Cr-Al-N coatings for high-speed machining of flexible fine die (FFD) were conducted. Ternary Cr-Al-N coatings, in which Al was incorporated into CrN, were synthesized onto WC-Co substrates using a hybrid coating system of arc ion plating and sputtering techniques. From XRD analysis the nanocomposite Cr-Al-N coatings were related to the composite microstructure consisting of the fine CrN crystallites and amorphous Si 3N 4. The average friction coefficient of Cr-Al-N coatings gradually decreased with Al content in CrN coatings. The values of tool wear for uncoated, CrN and Cr-Al-N coated tools were evaluated under a high-speed cutting condition using a vertical high-speed machining center. Consequently, the ternary Cr-Al-N coated micro-tool showed good cutting performance under micro high-speed machining of AISI W1-8 steel of hardness 52 HRC for flexible fine die.