Explicit modeling and investigation of friction torques in double-nut ball screws for the precision design of ball screw feed drives

Kwang Je Oh, Lei Cao, Sung Chong Chung

Research output: Contribution to journalArticle

3 Scopus citations

Abstract

Explicit friction torque model composed of an applied load and viscous friction terms is formulated for two-point contact double-nut ball screws. Precision friction torque test rig is developed to verify the model. Forward and reverse direction measurements show a small friction difference due to the asymmetric nut geometry. Experiments confirm the friction prediction accuracy of 89%. Although a large axial load is applied to a ball screw, a lower and smoother friction torque is obtained by a proper preload selection through the developed model. It is also applicable as a thermal boundary condition for the finite element analysis. Efficient, smooth and accurate feed systems are obtained through the optimization of ball screw design parameters by minimizing the friction model.

Original languageEnglish
Article number105841
JournalTribology International
Volume141
DOIs
StatePublished - 2020 Jan

Keywords

  • Axial load
  • Ball screw
  • Explicit friction torque model
  • Preload

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