TY - JOUR
T1 - High-speed ball nose end milling of burn-resistant titanium (BuRTi) alloy
AU - Hood, R.
AU - Johnson, C.M.
AU - Soo, S.L.
AU - Aspinwall, D.K.
AU - Sage, C.
PY - 2014/2/1
Y1 - 2014/2/1
N2 - Following a brief introduction to aero-engine materials and the development of BuRTi alloy (Ti-25V-15Cr-2Al-0.2C), the paper details a statistically designed machinability experiment involving high-speed ball end milling. Testing utilised 8 mm diameter AlTiN-coated carbide ball nose end mills in a Taguchi L8 fractional factorial design with six factors, each at two levels. Output measures related to tool life/wear, cutting forces, workpiece surface roughness, microstructure and microhardness. Main effect plots, tabulated ANOVA data, percentage contribution ratio (PCR) values together with graphical and SEM data are presented. Use of the lowest material removal rate, high-pressure (70 bar) cutting fluid and a workpiece orientation of 45° resulted in the longest tool life with a machining time of ~60 min; however, surface roughness was poor, and there was smeared/adhered material to a depth of 20 μm. Additionally, carbide fracture/pull-out was observed near the workpiece surfaces whereas microhardness depth profiles from sectioned, mounted and polished samples showed a moderate increase in surface hardness of ~80HK0.25 above the bulk value.
AB - Following a brief introduction to aero-engine materials and the development of BuRTi alloy (Ti-25V-15Cr-2Al-0.2C), the paper details a statistically designed machinability experiment involving high-speed ball end milling. Testing utilised 8 mm diameter AlTiN-coated carbide ball nose end mills in a Taguchi L8 fractional factorial design with six factors, each at two levels. Output measures related to tool life/wear, cutting forces, workpiece surface roughness, microstructure and microhardness. Main effect plots, tabulated ANOVA data, percentage contribution ratio (PCR) values together with graphical and SEM data are presented. Use of the lowest material removal rate, high-pressure (70 bar) cutting fluid and a workpiece orientation of 45° resulted in the longest tool life with a machining time of ~60 min; however, surface roughness was poor, and there was smeared/adhered material to a depth of 20 μm. Additionally, carbide fracture/pull-out was observed near the workpiece surfaces whereas microhardness depth profiles from sectioned, mounted and polished samples showed a moderate increase in surface hardness of ~80HK0.25 above the bulk value.
KW - titanium alloy
KW - high-speed milling
KW - Taguchi
KW - surface integrity
UR - http://www.scopus.com/inward/record.url?eid=2-s2.0-84890127446&partnerID=8YFLogxK
U2 - 10.1080/0951192X.2013.801563
DO - 10.1080/0951192X.2013.801563
M3 - Article
AN - SCOPUS:84890127446
SN - 0951-192X
VL - 27
SP - 139
EP - 147
JO - International Journal of Computer Integrated Manufacture
JF - International Journal of Computer Integrated Manufacture
IS - 2
ER -