Residual stresses and workpiece deformation due to polishing and plating of computer hard disk substrates

B. E. Klamecki

Research output: Contribution to journalArticle

3 Scopus citations

Abstract

Residual stress distributions due to plating and polishing were determined for nickelphosphorus plated aluminum alloy disks. Knowledge of these stresses provides insight into the material deformation and removal processes, information as to the effects of processing conditions on residual stress magnitude and can also serve as a basis for development of models of material deformation and removal in polishing. Measured disk shape data was fitted to an analytical solution for plate displacement due to bending moments, and residual stresses were calculated. Plating and polishing residual stresses were separated. Polishing residual stress is compressive indicating differential plastic deformation between the surface and interior regions of the workpiece. Residual stresses produced in polishing operations in which process motions were constrained so that polishing was unidirectional were measured. The results show large differences between amounts of deformation in the polishing direction and the direction perpendicular to it.

Original languageEnglish (US)
Pages (from-to)32-40
Number of pages9
JournalJournal of Manufacturing Science and Engineering, Transactions of the ASME
Volume121
Issue number1
DOIs
StatePublished - Feb 1999

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