Sub-zero metalworking fluids (MWF) are supplied to the machining process at temperatures below 0 °C, but above those used in cryogenic machining. As sub-zero MWF are liquids, such that additives can be used. The effects of such additives on machining with sub-zero MWF were studied in the present work. The base MWF was a mixture of water and ethane-1,2-diol with which temperatures down to about −50 °C can be achieved. The influence of the properties of the base MWF, which can be influenced by the concentration of the ethane-1,2-diol, on the machining process are discussed. Anti-corrosion, anti-wear, and extreme pressures additives were examined by face turning of steel for varied temperatures of the sub-zero MWF regarding tool temperatures, tool wear, and surface roughness. The effects achieved by the additives were found to be temperature-dependent and interactions between the additives were observed. The results show that further research on the effects of additives in sub-zero MWF is needed.

零度以下的金属加工液（MWF）在低于0°C但高于低温加工所用温度的条件下提供给加工过程。由于低于零的MWF是液体，因此可以使用添加剂。在目前的工作中，研究了此类添加剂对MWF低于零的加工的影响。基础MWF是水和乙烷-1,2-二醇的混合物，其温度可降低至约-50°C。讨论了基础MWF的性能对机加工工艺的影响，该性能可能会受到乙烷-1,2-二醇浓度的影响。通过对工具温度，工具磨损和表面粗糙度进行低于零的MWF的温度变化的钢的端面车削，检查了抗腐蚀，抗磨和极压添加剂。发现通过添加剂实现的效果是温度依赖性的，并且观察到了添加剂之间的相互作用。结果表明，需要进一步研究添加剂在零以下MWF中的作用。