Study on the Machining Performance and Mechanism of Cold Plasma Coupled Micro-lubrication Micro-milling CFRP
Carbon fiber reinforced polymer(CFRP)has excellent properties including high specific strength,good corrosion resistance and high-temperature resistance.However,the structure of CFRP is anisotropic and non-homogeneous,and it is prone to damage such as fiber tearing,delamination and debonding during mechanical processing,which makes it difficult for surface quality and performance to meet practical demands.Cold plasma jet is rich in active particles and has low macroscopic temperature,and can effectively modify material properties without causing significant damages.It is proposed to use cold plasma jet to regulate the surface wettability and mechanical properties of CFRP materials,combining minimum-quantity lubrication(MQL)cooling medium,achieving high-quality and low-damage machining of CFRP by composite energy field-assisted micro-milling.Firstly,the effect of cold plasma jet on the surface wettability of CFRP is studied by hydrophilization experiments,and it is found that the jet could reduce the contact angle of CFRP surface to less than 10° within 40 s,which effectively improved the wettability of CFRP.Then,tensile experiments and single particle scratch tests are conducted to investigate the effect of the plasma jet on the mechanical properties of CFRP,and it is found that the tensile strength of CFRP under the action of jet decreased by about 17％,while promoting the brittle fracture of the material.Finally,micro-milling experiments are conducted on CFRP under different cooling and lubrication conditions to study the effect and mechanism of cold plasma jet and MQL cooling medium on material machinability.The results show that compare with dry milling,the compound energy field energy of cold plasma jet and MQL cooling medium reduces the cutting temperature by 28％,the cutting force by more than 10％,and the surface roughness by 47％,and effectively alleviate defects of fiber debonding,bending and tearing on the machined surfaces.
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