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Influence of Heating Rate on Flow Stress in High-Speed Machining Processes

Published

Author(s)

Matthew A. Davies, Sean W. Smith

Abstract

For several decades, a major focus of machining research has been the measurement and prediction of temperature. Here, the influence of the rate of heating on the flow processes, in particular to predictions of the temperature, are discussed. Results are presented of some recent NIST research using a split-Hopkinson (Kolsky) pressure bar (SHPB) with a rapit preheating capability. This work implies that, in AISI 1045 steel and related mild steels of interest in manufacturing, the thermal-softening effect during machining is significantly smaller than predicted by current constitutive response models. The pulse-heated Kolsky bar data are shown to provide improved finite-element predictions of experimentally measured maximum temperatures on the tool-chip interface.
Citation
CIRP

Keywords

material behavior, metal cutting, SHPB strain, strain rate, temperature

Citation

Davies, M. and Smith, S. (2004), Influence of Heating Rate on Flow Stress in High-Speed Machining Processes, CIRP (Accessed November 30, 2023)
Created May 1, 2004, Updated February 17, 2017