中文摘要：

TC4钛合金在高速车削时易出现刀具磨损快和缠屑等问题,难以保证表面加工质量。利用自行组建的强压液态CO2供给系统,将低温CO2混合物高速射流作为冷却润滑介质,研究了低温CO2射流下高速切削TC4钛合金时的切削温度、切削力、刀具磨损、表面粗糙度以及切屑的断屑情况,并将其与干切削状况进行了对比分析。结果表明,低温CO2射流可有效降低切削温度,减小切削力,减轻切屑缠绕,抑制刀具磨损并提高已加工表面质量。

英文摘要：

Rapid tool wear and poor chip breaking performance appeared on high speed cutting of TC4 alloy, while quality of the machined surfaces might not be guaranteed. By high-pressure liquid CO2 supply system, TC4 titanium alloy was tested with high speed cutting processes under condition of CO2 snow coolant. Cutting temperaturs,cutting force,tool wear, surface roughness and chip breakings of TC4 cutting were analyzed on high speed TC4 under enhanced cooling of cryogenic CO2. Difference between suppress CO 2 snow cooling condition and dry cutting condition were compared with multi-parameters. Experimental results show that cutting temperatures, cutting forces,chip breakings, tool wears and quality of the machined surfaces are improved by the suppress CO2 snow coolant.