The optimum composition of Me-C:H coatings on drills for cutting performance

W. H. Kao, Yean-Liang Su, S. H. Yao, J. M. Luan

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

This study investigates the drilling of AISI 1045 steel workpieces using Ti-based (Ti-C:H, Ti-C:H/TiC/TiCN/TiN and TiC/TiCN/TiN) and Cr-based (Cr-C:H/CrC/CrCN/CrN, Cr-C:H and CrC/CrCN/CrN) Me-C:H coated high-speed steel drills. The thrust forces, torque, flank wear and hole surface roughness are measured in order to evaluate the cutting performance of each coated drill. The coating comprising a Ti-C:H top layer deposited over an intermediate layer of TiC/TiCN/TiN results in a low and stable cutting force (thrust force and torque) throughout the drilling tests. This coated drill also demonstrates the highest drill wear resistance and produces a superior machined surface finish. The excellent cutting performance of this particular drill is due to the fact that the multi-layer composition generates an excellent solid lubricant effect, which improves the tribological interaction between the drill and the workpiece, hence resulting in a significant reduction in material transfer at the drill edge. Drills coated with a single thick Ti-C:H topcoat or with a single thick TiC/TiCN/TiN intermediate layer demonstrate poor cutting characteristics, including high flank wear, high thrust force, high torque and poor drilled hole quality. In general, the Cr-based coated drills exhibit a relatively poorer cutting performance and an inferior drilled hole quality than the Ti-based coated drills since the Cr element in the coating possesses a high chemical affinity for Fe.

Original languageEnglish
Pages (from-to)233-240
Number of pages8
JournalMaterials Science and Engineering A
Volume398
Issue number1-2
DOIs
Publication statusPublished - 2005 May 25

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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