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Preheating assisted wire EDM of semi-conductive CFRPs: Principle and Anisotropy
Journal of Materials Processing Technology ( IF 6.3 ) Pub Date : 2021-02-01 , DOI: 10.1016/j.jmatprotec.2020.116915
Chaoqun Wu , Shiyu Cao , Yong Jie Zhao , Huan Qi , Xiaoling Liu , Gongyu Liu , Jianglong Guo , Hao Nan Li

Abstract Introducing small-sized functional features such as anti-drag and anti-icing micro structures on Carbon Fibre Reinforced Plastics (CFRPs) is challenging but a still unmet demand. Existing contact CFRP machining solutions may bring unavoidable tool wear and surface defects. Non-contact approaches may introduce significant thermal damage (laser), inconsistent features (waterjet), and limited achievable micro structure shapes and sizes (die sinking Electrical Discharge Machining). Wire Electrical Discharge Machining (WEDM) has the potential to overcome the mentioned limitations. Both theoretical thermal calculation and experimental demonstration in our work, however, showed that conventional WEDM was not working well. Here we propose and implement a Preheating Assisted Wire EDM (PAWEDM) to cut CFRPs. Machining anisotropy in terms of kerf geometry and morphology at the cut entries, ends, and edges was studied carefully. Discussions on the anisotropy principle, the influence of carbon fibre and epoxy resin, and the minimum achievable feature were also provided. PAWEDM is an entirely new CFRP cutting method and effective to enhance CFRP performances by creating micro functional and structural features on CFRP products.

中文翻译:

半导电 CFRP 的预热辅助线 EDM:原理和各向异性

摘要 在碳纤维增强塑料 (CFRPs) 上引入诸如抗阻力和抗冰微结构等小尺寸功能特性具有挑战性,但仍未满足需求。现有的接触式 CFRP 加工解决方案可能会带来不可避免的刀具磨损和表面缺陷。非接触式方法可能会导致显着的热损伤(激光)、不一致的特征(水刀)以及可实现的微结构形状和尺寸有限(下沉放电加工)。线材放电加工 (WEDM) 有可能克服上述限制。然而,我们工作中的理论热计算和实验证明都表明传统的 WEDM 不能很好地工作。在这里,我们建议并实施预热辅助电火花线切割机 (PAWEDM) 来切割 CFRP。仔细研究了切割入口、端部和边缘处的切口几何形状和形态方面的加工各向异性。还讨论了各向异性原理、碳纤维和环氧树脂的影响以及可实现的最小特征。PAWEDM 是一种全新的 CFRP 切割方法,可通过在 CFRP 产品上创建微功能和结构特征来有效提高 CFRP 性能。
更新日期:2021-02-01
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