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<p>Frictional thermodynamic behavior evolution <i>(dynamic evolution processes of frictional thermodynamic parameters)</i> is an important irreversible process during the milling process of titanium alloys, thermodynamic parameters directly affect the tool friction and wear state, which affects the tool service life. In this work, the milling process model under dynamic milling vibration, a thermodynamic behavior model of the tool-workpiece interface is developed to study the thermodynamic entropy generation of friction force on tool flank. A two-dimensional tool transient thermal conduction model is developed, and a two-dimensional thermal conduction entropy generation model is proposed to study the tool thermal transfer entropy generation evolution, the entropy generation evolution of chemical reactions at the tool interface is also investigated based on the Gibbs free energy method. The friction and wear entropy flow evolution of the tool-workpiece interface were studied, the entropy flow of the tool-workpiece interface due to the abrasive wear is investigated. Finally, the thermodynamic state transition criterion of the tool-workpiece interface was determined, and a method for recognizing the thermodynamic state transition during cutting-in to cutting-out period was proposed and validated by experiments.</p>

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An innovative model for frictional thermodynamics and its application in state transition recognition in milling of titanium alloys

  • 期刊论文

  • 发表日期：

    2025年2月4日

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  • Peiyi Zhao,
  • Qiang Ma,
  • Bin Jiang,
  • Zikang Wang

摘要

Frictional thermodynamic behavior evolution (dynamic evolution processes of frictional thermodynamic parameters) is an important irreversible process during the milling process of titanium alloys, thermodynamic parameters directly affect the tool friction and wear state, which affects the tool service life. In this work, the milling process model under dynamic milling vibration, a thermodynamic behavior model of the tool-workpiece interface is developed to study the thermodynamic entropy generation of friction force on tool flank. A two-dimensional tool transient thermal conduction model is developed, and a two-dimensional thermal conduction entropy generation model is proposed to study the tool thermal transfer entropy generation evolution, the entropy generation evolution of chemical reactions at the tool interface is also investigated based on the Gibbs free energy method. The friction and wear entropy flow evolution of the tool-workpiece interface were studied, the entropy flow of the tool-workpiece interface due to the abrasive wear is investigated. Finally, the thermodynamic state transition criterion of the tool-workpiece interface was determined, and a method for recognizing the thermodynamic state transition during cutting-in to cutting-out period was proposed and validated by experiments.