TY - GEN
T1 - Surface roughness and sub-surface deformation measurements in machining of niobium
AU - Olsson, Mike
AU - Persson, Henrik
AU - Bushlya, Volodymyr
AU - Ståhl, Jan-Eric
PY - 2018
Y1 - 2018
N2 - Single-phase niobium is used in superconducting accelerator components in particle accelerating facilities. Functionality of such accelerator components is placing high demands on the surface quality. Single-phase niobium, as opposed to niobium alloys, is a highly ductile metal, which in a cutting process normally leads to such surface defects as adhesion, built-up edges, side flow, and burr formation. In this study, six different tool materials: uncoated and two types of coated cemented carbide, PCBN, PCD and single-crystal diamond have been tested in longitudinal turning of niobium at different cutting parameters, in order to achieve the target value of Ra = 0.8 μm. Experimental studies involved finish machining with varied feed and cutting speed, while depth of cut was kept at ap = 0.25 mm. Apart from the resulting surface finish Ra and cutting forces, the following surface quality parameters were analysed: side-flow, adhesion, burr formation and sub-surface deformation. Only two of the tool materials, PCD and nanolaminate TiAlN/TiSiN coated cemented carbide, have shown acceptable surface integrity results.
AB - Single-phase niobium is used in superconducting accelerator components in particle accelerating facilities. Functionality of such accelerator components is placing high demands on the surface quality. Single-phase niobium, as opposed to niobium alloys, is a highly ductile metal, which in a cutting process normally leads to such surface defects as adhesion, built-up edges, side flow, and burr formation. In this study, six different tool materials: uncoated and two types of coated cemented carbide, PCBN, PCD and single-crystal diamond have been tested in longitudinal turning of niobium at different cutting parameters, in order to achieve the target value of Ra = 0.8 μm. Experimental studies involved finish machining with varied feed and cutting speed, while depth of cut was kept at ap = 0.25 mm. Apart from the resulting surface finish Ra and cutting forces, the following surface quality parameters were analysed: side-flow, adhesion, burr formation and sub-surface deformation. Only two of the tool materials, PCD and nanolaminate TiAlN/TiSiN coated cemented carbide, have shown acceptable surface integrity results.
KW - Niobium
KW - machining
KW - surface integrity
U2 - 10.1016/j.procir.2018.05.058
DO - 10.1016/j.procir.2018.05.058
M3 - Paper in conference proceeding
VL - 71
T3 - Procedia CIRP
SP - 413
EP - 417
BT - Procedia CIRP
ER -