This paper presents a novel indirect cryogenic cooling system, employing liquid nitrogen (LN₂) as a coolant for machining the difficult-to-cut ASTM F-1537 cobalt-chromium (CoCr) alloy. The prototype differs from the already existing indirect cooling systems by using a modified cutting insert that allows a larger volume of cryogenic fluid to flow under the cutting zone. For designing the prototype analytical and finite element, thermal calculations were performed; this enabled to optimize the heat evacuation of the tool from the rake face without altering the stress distribution on the insert when cutting material. Turning experiments on ASTM F-1537 CoCr alloys were performed under different cutting conditions and employing indirect cryogenic cooling and dry machining, to test the performance of the developed system. The results showed that the new system improved surface roughness by 12%, and cutting forces were also reduced by 12% when compared with the existing indirect cryogenic cooling technique.

本文提出了一种采用液氮（LN ₂）作为加工难切削的ASTM F-1537钴铬（CoCr）合金的冷却剂。该原型与现有的间接冷却系统不同，它使用的是改良的切削刀片，该切削刀片可让大量的低温流体在切削区域下流动。为了设计原型分析和有限元，进行了热计算。这样就可以优化刀具从前刀面的散热，而不会在切削材料时改变刀片上的应力分布。在不同的切削条件下，采用间接低温冷却和干式加工，对ASTM F-1537 CoCr合金进行了车削实验，以测试所开发系统的性能。结果表明，新系统将表面粗糙度提高了12％，