Improve machining processes from an environmental point of view is a hot topic currently. In this line, cryogenics CO₂ is presented as a solution to substitute conventional oil emulsions. However, to be applied industrially, it is needed to control CO₂ flow rate with the aim of reducing CO₂ consumption to reach what it is known as ECO₂-performance (economy + ecology). Then, despite currently CO₂ cooling technique is used as external coolant, it is needed to improve its use—especially in milling processes—for achieving this goal. In line with this, in this paper is presented the use of CO₂ as tool internal coolant as a solution to optimize its use. For checking its suitability, a study based on computer fluid dynamics with a new cryogenic tool channels design and experimental tests were carried out for analyzing the differences between using CO₂ as internal and external coolant with the aim of improving the use of cryogenic gases during Inconel 718 milling processes. The results show that the use of CO₂ as internal coolant improves the current milling process not only from environmental point of view but also economic and technical, bringing CO₂ cryogenic technology closer to industrial milling conditions.

从环境角度来看，改善加工工艺是当前的热门话题。在这一方面，低温CO ₂作为替代常规油乳液的解决方案被提出。然而，要在工业上应用，需要控制CO ₂流量，以减少CO ₂消耗以达到所谓的ECO ₂性能（经济+生态）。然后，尽管目前将CO ₂冷却技术用作外部冷却剂，但仍需要改善其使用（尤其是在铣削过程中）以实现此目标。为此，本文提出了CO ₂的使用作为工具内部冷却剂，作为优化其使用的解决方案。为了检查其适用性，进行了基于计算机流体动力学的新型低温工具通道设计研究，并进行了实验测试，以分析使用CO ₂作为内部和外部冷却剂之间的差异，目的是改善Inconel期间低温气体的使用718个铣削过程。结果表明，使用CO ₂作为内部冷却剂不仅从环境的角度而且从经济和技术角度都改善了当前的制粉工艺，使CO ₂低温技术更接近工业制粉条件。