Thermal Equilibrium Research of Supercritical CO2 Assisted Cutting Process Based on Mass Flow Optimization

doi:10.3901/JME.2024.10.367

Abstract

Abstract: Cryogenic cutting technology with good cooling effect has been gradually applied in the machining of difficult-to-machine materials, but little research has been done on the thermal equilibrium regulation of the cutting zone and the jet field based on cryogenic fluid parameters under different cutting parameters.Aiming at the thermal equilibrium regulation of supercritical CO₂-assisted cutting processing, the cutting zone and the jet field are considered as a thermodynamic system, and the material and energy input and output of the system, i.e., the enthalpy change of supercritical CO₂ and the energy change of the chip, are analyzed from a continuous time-domain perspective.Further, based on the CO₂ thermal properties, metal cutting principles and thermodynamic theory, a thermal equilibrium regulation method of cutting zone and jet field based on the jet mass flow rate is proposed for the case of variable cutting speed.The feasibility of the thermal equilibrium regulation method based on mass flow rate was verified by relevant experiments under different mass flow rates.The results show that the thermal equilibrium regulation method can accelerate the thermal equilibrium process in the cutting zone and the jet field and the cutting zone temperature, main cutting force, and surface roughness are reduced by at least 7.8%, 7.9%, and 7.1%, respectively, at different cutting speeds.

Key words: supercritical CO₂, thermal equilibrium, mass flow, Ti-6Al-4V

CLC Number:

TH162

ZHU Libin, WANG Ying, NIE Shuaishuai, HUANG Haihong, LIU Zhifeng. Thermal Equilibrium Research of Supercritical CO₂ Assisted Cutting Process Based on Mass Flow Optimization[J]. Journal of Mechanical Engineering, 2024, 60(19): 367-376.

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Thermal Equilibrium Research of Supercritical CO₂ Assisted Cutting Process Based on Mass Flow Optimization

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