NDLI: Diamond Coatings for Machining: Coating Thickness Effects

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Qin, Feng Chou, Y. Kevin Nolen, Dustin Raymond, G. Thompson
Copyright Year	2009
Abstract	Chemical vapor deposition (CVD)-grown diamond films have found applications as a hard coating for cutting tools. Even though the use of conventional diamond coatings seems to be accepted in the cutting tool industry, selections of proper coating thickness for different machining operations have not been often studied. Coating thickness affects the characteristics of diamond coated cutting tools in different perspectives that may mutually impact the tool performance in machining in a complex way. In this study, coating thickness effects on the deposition residual stresses, particularly around a cutting edge, and on coating failure modes were numerically investigated. On the other hand, coating thickness effects on tool surface smoothness and cutting edge radii were experimentally investigated. In addition, machining Al matrix composites using diamond coated tools with varied coating thicknesses was conducted to evaluate the effects on cutting forces, part surface finish and tool wear. The results are summarized as follows. (1) Increasing coating thickness will increase the residual stresses at the coating-substrate interface. (2) On the other hand, increasing coating thickness will generally increase the resistance of coating cracking and delamination. (3) Thicker coatings will result in larger edge radii; however, the extent of the effect on cutting forces also depends upon the machining condition. (4) For the thickness range tested, the life of diamond coated tools increases with the coating thickness because of delay of delaminations.
Sponsorship	Manufacturing Engineering Division
Starting Page	485
Ending Page	491
Page Count	7
File Format	PDF
ISBN	9780791843611
DOI	10.1115/MSEC2009-84358
e-ISBN	9780791838594
Volume Number	ASME 2009 International Manufacturing Science and Engineering Conference, Volume 1
Conference Proceedings	ASME 2009 International Manufacturing Science and Engineering Conference
Language	English
Publisher Date	2009-10-04
Publisher Place	West Lafayette, Indiana, USA
Access Restriction	Subscribed
Subject Keyword	Cutting tools Cracking (materials) Machining Diamonds Residual stresses Coatings Chemical vapor deposition Cutting Fracture (process) Finishes Composite materials Wear Coating processes Delays Delamination Diamond films Failure mechanisms
Content Type	Text
Resource Type	Article

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