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Surface roughness and sub-surface deformation measurements in machining of niobium

Olsson, Mike LU ; Persson, Henrik LU ; Bushlya, Volodymyr LU and Ståhl, Jan-Eric LU (2018) In Procedia CIRP 71. p.413-417
Abstract
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... (More)
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. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
Niobium, machining, surface integrity
in
Procedia CIRP
volume
71
pages
5 pages
external identifiers
  • scopus:85051245387
ISSN
2212-8271
DOI
10.1016/j.procir.2018.05.058
language
English
LU publication?
yes
id
62210f56-5787-40bd-be18-5c560a4fb9e8
date added to LUP
2018-06-14 13:06:29
date last changed
2018-09-16 04:55:52
@inproceedings{62210f56-5787-40bd-be18-5c560a4fb9e8,
  abstract     = {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.},
  author       = {Olsson, Mike and Persson, Henrik and Bushlya, Volodymyr and Ståhl, Jan-Eric},
  booktitle    = {Procedia CIRP},
  issn         = {2212-8271},
  keyword      = {Niobium,machining,surface integrity},
  language     = {eng},
  pages        = {413--417},
  title        = {Surface roughness and sub-surface deformation measurements in machining of niobium},
  url          = {http://dx.doi.org/10.1016/j.procir.2018.05.058},
  volume       = {71},
  year         = {2018},
}