Proceedings of the
9th International Conference of Asian Society for Precision Engineering and Nanotechnology (ASPEN2022)
15 – 18 November 2022, Singapore
doi:10.3850/978-981-18-6021-8_OR-14-0060
Magnetic field dependent machinability in ultra-precision machining of single-crystal copper
Department of Mechanical Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore 117575, Singapore
ABSTRACT
The unsteady plastic flow during machining of ductile materials significantly limits their machinability. The magnetic field has shown a positive influence to alter the material deformation behaviour by promoting the dislocation movement in micro-cutting. In this work, the effect of a weak magnetic field and its directions on the machinability of single-crystal copper is investigated through magnetic field-assisted micro-cutting tests. Seven different magnetic field directions (0°, 30°, 60°, 90°, 120°, 150°, and 180°) relative to a constant cutting direction are applied in the micro-cutting tests. As a result, the application of magnetic field confirms the benefits to enhance the machinability of single-crystal copper, illustrated by a reduced cutting force, improved surface roughness, and suppressed subsurface damage. Moreover, the improvement in machinability of single-crystal copper closely depends on the magnetic field directions, and the 90° magnetic field shows the optimal cutting performance. The findings offer general guidance to enhance the machinability of ductile metals by introducing suitable magnetic fields with favourable directions.
Keywords: magnetic field, machinability, ultra-precision machining, copper
Department of Mechanical Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore 117575, Singapore
ABSTRACT
The unsteady plastic flow during machining of ductile materials significantly limits their machinability. The magnetic field has shown a positive influence to alter the material deformation behaviour by promoting the dislocation movement in micro-cutting. In this work, the effect of a weak magnetic field and its directions on the machinability of single-crystal copper is investigated through magnetic field-assisted micro-cutting tests. Seven different magnetic field directions (0°, 30°, 60°, 90°, 120°, 150°, and 180°) relative to a constant cutting direction are applied in the micro-cutting tests. As a result, the application of magnetic field confirms the benefits to enhance the machinability of single-crystal copper, illustrated by a reduced cutting force, improved surface roughness, and suppressed subsurface damage. Moreover, the improvement in machinability of single-crystal copper closely depends on the magnetic field directions, and the 90° magnetic field shows the optimal cutting performance. The findings offer general guidance to enhance the machinability of ductile metals by introducing suitable magnetic fields with favourable directions.
Keywords: magnetic field, machinability, ultra-precision machining, copper
