Drill-exit temperature characteristics in drilling of UD and MD CFRP composites based on infrared thermography
Drill-exit temperature characteristics in drilling of UD and MD CFRP composites based on infrared thermography
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基于红外热成像的 UD 和 MD CFRP 复合材料钻孔中的钻头出口温度特性
DOI：
10.1016/j.ijmachtools.2018.08.002
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发表时间：
2018-12-01
影响因子：
14
通讯作者：
Cheng, De
中科院分区：
文献类型：
--
作者：
Fu, Rao;Jia, Zhenyuan;Cheng, De
本文使用最先进的显微镜红外成像系统对单向 (UD) 和多向 (MD) CFRP 钻孔中复杂的钻头出口温度特性进行了全面研究。首次详细揭示了钻头出口处的温度变化和分布，与 CFRP 材料特性和钻探条件相关。结果表明，实际钻头/CFRP 相互作用对 UD 和 MD CFRP 的钻头出口温度具有关键但相似的影响。具体而言，当主切削刃作用于钻头出口材料时，具有不同温度特性的三个不同切削区域是明显的。在所有情况下，温度分布均呈椭圆形，其偏心率取决于敷层顺序和钻孔深度。此外，还可以高度可视化地创建实时温度曲线和2D/3D最高温度分布图。借助这些发现，首次发现了钻孔温度最大值、其位置和钻孔深度之间的关系，并首次阐明了温度对钻头出口损伤的影响。事实证明，由于相关的温度影响，MD CFRP 在某些纤维切割角度下比 UD CFRP 更难实现高钻孔质量。这些重要的知识能够识别热影响区域，并随后为减少负面温度影响的策略提供信息。
This paper presents a comprehensive study on the complex drill-exit temperature characteristics in the drilling of unidirectional (UD) and multidirectional (MD) CFRPs using a state-of-art microscopy infrared imaging system. For the first time, temperature variation and distribution at drill exit have been revealed in full detail, associated with the CFRP material properties and drilling conditions. Results suggest that the actual drill/CFRP interactions have critical but similar effects on the drill-exit temperatures for UD and MD CFRPs. Specifically, three distinct cutting regions with varying temperature characteristics are evident when the main cutting edge is acting on the drill exit material. In all cases, the temperature distribution features elliptical shape, of which the eccentricity depends on the lay-up sequence and the drilling depth. In addition, the real-time temperature profiles and 2D/3D maximum temperature distribution maps are created with high visualization. With the aid of those findings, the relationships between drilling temperature maxima, their locations and drilling depths have been discovered and temperature effects on drill-exit damages have been elucidated for the first time. MD CFRP is proven more difficult to achieve high drilling qualities at certain fiber cutting angles than UD CFRP due to the associated temperature effects. Such important knowledge enables the identification of the heat affected zones and subsequently informs strategies for reducing the negative temperature effects.