超临界二氧化碳低温铣削CFRP复合材料试验研究

Experimental Investigation on Milling Characteristic of CFRP Composites Under Supercritical Carbon Dioxide Based Cryogenic Environment

碳纤维增强复合材料(Carbon fiber reinforced polymer,CFRP)因其优异的性能在航空航天领域得到广泛应用。因其非均质性、各向异性以及较高的温度敏感性,在机械加工中容易发生不可逆的损伤。通过对T800/X850高强度碳纤维复合材料层合板进行干燥和低温条件下的铣削试验,探究了超临界二氧化碳低温冷却方法应用于CFRP复合材料机械加工的可行性。研究结果表明,低温切削相比于干切可以显著降低切削温度,提高表面质量;低温切削条件下的切削弯矩相比于干切会有一定提高;高转速、小进给、低温冷却的组合,有助于提高CFRP层合板的加工质量和加工效率。

Carbon fiber reinforced polymer(CFRP)has been widely used in aerospace field because of its excellent material performance.Because of its heterogeneity,anisotropy and high temperature-sensitivity,machining defects is prone to occur.In this work,the milling experiments of T800/X850 carbon fiber composite laminates,which are commonly used in aviation industry,were carried out to investigate the feasibility of supercritical carbon dioxide based cryogenic cooling method in CFRP composites machining.The results show that cryogenic environment can significantly reduce the cutting temperature and improve the surface quality compared with dry environment.Meanwhile,the bending moment of cutting process under cryogenic environment is higher than that under dry environment.The combination of high cutting speed,low feed rate and cryogenic environment is helpful to improve the machining quality and efficiency of CFRP composite.