Abstract
n the precision machining of in-situ TiB2/7075 composite, the feasibility of cryogenic minimum quantity lubrication (CMQL) was explored considering the requirements of environmental protection and prolonging tool life. In the supercritical CO2 (scCO2) jet, water-based cutting fluid further improved the cooling performance, while the soluble vegetable oil greatly improved the lubrication performance. The friction experiment verified that the coefficient of friction (COF) under scCO2-oil on water based MQL (scCO2-OoWMQL) condition was as low as 0.1. The milling experiment verified that the scCO2-OoWMQL condition was prominent in inhibiting adhesive wear and slowing down abrasive wear, due to the combination of excellent cooling and lubrication performance, so the tool life was extended by 198.08% compared with dry conditions.
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