The high technological properties of carbon fiber reinforced plastics (CFRPs) have led to their ever-increasing use in recent decades for industrial applications, especially in the aerospace and automotive sectors, where the demand for lightweight structures is high. The panels of composite, to be assembled with other materials, may require repeated realization of holes, making the final quality of the union highly dependent on the drilling process. However, the heterogeneity of the composite material may lead to several inconveniencies, such as rapid tool wear and hole delamination, as during machining the drill bit encounters fiber and matrix alternatively, which have different properties. These damages could be reduced through cryogenic drilling, as demonstrated in the related literature, mainly because the machining behavior of composite changes at low temperatures. Starting from this evidence, the present paper proposes an experimental study conducted on CFRP panels using a new methodology of cryogenic drilling, based on the pre-cooling of the composite before starting the machining process, in order to create a uniformly refrigerated material. The analysis is aimed at comparing the hole quality obtained under dry and pre-cooled cryogenic conditions in terms of delamination, surface roughness and dimensional accuracy and at evaluating thrust force, tool wear and the influence of feed rate.

碳纤维增强塑料（CFRP）的高技术性能已导致它们在最近几十年中越来越多地用于工业应用，尤其是在对轻型结构的需求很高的航空航天和汽车领域。要与其他材料组装在一起的复合材料面板可能需要重复形成孔，从而使接头的最终质量在很大程度上取决于钻孔过程。但是，复合材料的异质性可能导致一些不便，例如快速的工具磨损和孔分层，因为在加工过程中，钻头会交替遇到具有不同特性的纤维和基体。如相关文献所示，可以通过深冷钻孔来减少这些损害，主要是因为复合材料的加工性能在低温下会发生变化。从这一证据出发，本文提出了一种在CFRP面板上进行实验研究的方法，该方法使用了一种新的低温钻孔方法，该方法基于在开始加工过程之前对复合材料进行预冷却，从而创建出一种均匀冷藏的材料。该分析旨在比较在干燥和预冷的低温条件下获得的孔质量，包括分层，表面粗糙度和尺寸精度，并评估推力，工具磨损和进给速度的影响。基于在开始加工过程之前对复合材料进行预冷，以产生均匀的制冷材料。该分析旨在比较在干燥和预冷的低温条件下获得的孔质量，包括分层，表面粗糙度和尺寸精度，并评估推力，工具磨损和进给速度的影响。基于在开始加工过程之前对复合材料进行预冷，以产生均匀的制冷材料。该分析旨在比较在干燥和预冷的低温条件下获得的孔质量，包括分层，表面粗糙度和尺寸精度，并评估推力，工具磨损和进给速度的影响。