Creep feed grinding of gamma titanium aluminide and burn resistant titanium alloys using SiC abrasive |
| |
Authors: | R. Hood F. Lechner D.K. Aspinwall W. Voice |
| |
Affiliation: | aSchool of Engineering, University of Birmingham, Edgbaston, Birmingham, West Midlands B15 2TT, UK;bTechnical University of Munich, Briefabnschrift, 80290 Munich, Germany;cRolls-Royce Plc, P.O. Box 31, Derby DE24 8BJ, UK |
| |
Abstract: | Following a brief introduction to titanium alloys and their machinability, the cutting performance of a gamma titanium aluminide intermetallic (γ-TiAl) alloy: Ti–45Al–8Nb–0.2C wt% and a burn resistant titanium (BuRTi) alloy: Ti–25V–15Cr–2Al–0.2C wt%, is compared with creep feed grinding using SiC abrasive. The work utilised 2 separate L9 Taguchi fractional factorial arrays. Typically G-ratios were a factor of 10× greater for γ-TiAl than BuRTi, with on average 10% lower maximum power and 25% lower maximum specific energy for the γ-TiAl alloy. A combination of a moderately high wheel speed: 35 m/s, low depth of cut: 1.25 mm and low feed rate: 150 mm/min, produced the lowest average workpiece surface roughness (Ra1.4 μm). Workpiece surface integrity evaluation indicated that with lower operating parameter levels, in particular a wheel speed of 15 m/s, surfaces free of burn and cracks could be produced, while at higher wheel speeds: 35 m/s, extensive workpiece surface burn was evident, with the γ-TiAl alloy suffering extensive cracking. Microhardness measurements showed in some instances slightly increased workpiece surface hardness of around 50–60HK0.025 for the BuRTi alloy and 200HK0.025 for the γ-TiAl material over respective bulk hardness values of 375HK0.025 and 400HK0.025. |
| |
Keywords: | Titanium alloys Machinability Creep feed grinding |
本文献已被 ScienceDirect 等数据库收录! |
|