CUTTING OF DIFFICULT-TO-CUT WOOD-BASED MA TERIALS WITH DIAMOND-COATEDCEMENTED CARBIDE TOOLS .1. DIFFERENCE OF CUTTING PERFORMANCE BY THE FILAMENT POWER IN THE SYNTHESIS OF DIAMOND FILM
T. Morita et al., CUTTING OF DIFFICULT-TO-CUT WOOD-BASED MA TERIALS WITH DIAMOND-COATEDCEMENTED CARBIDE TOOLS .1. DIFFERENCE OF CUTTING PERFORMANCE BY THE FILAMENT POWER IN THE SYNTHESIS OF DIAMOND FILM, Mokuzai Gakkaishi, 41(12), 1995, pp. 1093-1101
In this study, diamond films whose thicknesses were 20 mu m were synth
esized on both rake and clearance faces of throw-away cemented carbide
milling tips by the hot-filament chemical vapor deposition (CVD) meth
od with varying filament powers. Continual milling tests of wood-chip
cement board with three kinds of diamond coated tools with filament po
wers of 2.2, 2.3, 2.4 kW and a non-coated one were conducted until the
total cutting length reached approximately 116.5 m, and then the cutt
ing performances were examined. Although diamond films of coated tools
peeled off in the early stage of cutting, edge recessions and surface
roughness of these tools in the middle stage of cutting became extrem
ely small compared with that of the non-coated one. In the last stage
of cutting, the tool edge of a filament power of 2.4 kW fractured, and
its edge receded extremely. However, this type of fracture was not se
en for the filament powers of 2.2 kW and 2.3 kW. For cutting power con
sumption and cutting noise, these values for the non-coated tool were
the smallest among all tools tested in the early stage of cutting, but
those for coated tools became almost equal to that for the non-coated
one with the continuation of cutting. As a result, diamond coated too
ls she-wed excellent cutting performances compared with the non-coated
one for edge recession and surface roughness, and the cutting perform
ance depended on the filament power in the hot-filament CVD method.