Experimental investigation of hard turning mechanisms by PCBN tooling embedded micro thin film thermocouples

Linwen Li, Bin Li, Xiaochun Li, Kornel Ehmann*

*Corresponding author for this work

Research output: Contribution to journalArticle

13 Scopus citations

Abstract

Temperature-distribution measurements in cutting tools during the machining process are extremely difficult and remain an unresolved problem. In this paper, cutting temperature distributions were measured by thin film thermocouples (TFTCs) embedded into polycrystalline cubic boron nitride (PCBN) cutting inserts in the immediate vicinity of the tool-chip interface. The embedded TFTC array provides temperature measurements with a degree of spatial resolution (100 lm) and dynamic response (150 ns) that is not possible with currently employed methods due to the micro-scale junction size of the TFTCs. Using these measurements during hard turning, steady-state, dynamic, as well as chip morphology and formation process analyses were performed based on the cutting temperature and cutting force variations in the cutting zone. It has been shown that the temperature changes in the cutting zone depend on the shearing band location in the chip and the thermal transfer rate from the heat generation zone to the cutting tool. Furthermore, it became evident that the material flow stress and the shearing bands greatly affect not only the chip formation morphology but also the cutting temperature field distributions in the cutting zone of the cutting insert.

Original languageEnglish (US)
Article number041012
JournalJournal of Manufacturing Science and Engineering, Transactions of the ASME
Volume135
Issue number4
DOIs
StatePublished - Sep 16 2013

Keywords

  • Cutting temperature
  • Cutting temperature distribution
  • Micro thin film thermocouples
  • PCBN hard turning mechanisms

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Mechanical Engineering
  • Computer Science Applications
  • Industrial and Manufacturing Engineering

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