Abstract During the helical milling of carbon fibre reinforced polymer (CFRP)/Ti laminated structures, there are inevitable influences between the CFRP and Ti. This paper investigated the effect of Ti on hole quality in CFRP during the helical milling of a CFRP/Ti laminate. Cutting force and heat, as well as the surface and subsurface qualities of holes in CFRP, were observed with and without the presence of a Ti base layer. A subsurface damage assessment method is also proposed. The results show that Ti had slight influences on cutting force and surface quality, and significant influences on cutting temperature and subsurface quality. The cutting of Ti generates a great deal of heat, thus significantly increasing the temperature at the outlets of CFRP holes. Due to this high temperature, the rigidity and adhesive properties of the CFRP resin base decline, which causes serious subsurface damage to the fibre layers close to the hole outlets. Subsurface damage was evaluated by the proposed assessment method (maximum damage depth = 54.7 μm). Additionally, the fibre cutting angle greatly influences the depth of subsurface damage. Hence, CFRP hole quality is significantly influenced by the cutting of adjacent Ti layers during the helical milling of CFRP/Ti laminates. Subsurface damage is the best factor for assessing CFRP processing quality.

中文翻译：

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在 CFRP/Ti 层压板螺旋铣削过程中，Ti 合金层对 CFRP 孔质量的影响

摘要 碳纤维增强聚合物（CFRP）/Ti层状结构在螺旋铣削过程中，CFRP与Ti之间不可避免地存在影响。本文研究了在螺旋铣削 CFRP/Ti 层压板期间 Ti 对 CFRP 孔质量的影响。切削力和热量，以及 CFRP 孔的表面和亚表面质量，在有和没有 Ti 基层的情况下都可以观察到。还提出了一种地下损伤评估方法。结果表明，Ti对切削力和表面质量的影响很小，而对切削温度和次表面质量的影响显着。Ti 的切割会产生大量热量，从而显着提高 CFRP 孔出口处的温度。由于这种高温，CFRP树脂基体的刚性和粘合性能下降，对靠近孔口的纤维层造成严重的亚表面损伤。通过建议的评估方法评估地下损伤（最大损伤深度 = 54.7 μm）。此外，纤维切割角度极大地影响了地下损伤的深度。因此，在 CFRP/Ti 层压板的螺旋铣削过程中，CFRP 孔质量受到相邻 Ti 层切割的显着影响。次表面损伤是评估 CFRP 加工质量的最佳因素。在 CFRP/Ti 层压板的螺旋铣削过程中，CFRP 孔质量受到相邻 Ti 层切割的显着影响。次表面损伤是评估 CFRP 加工质量的最佳因素。在 CFRP/Ti 层压板的螺旋铣削过程中，CFRP 孔质量受到相邻 Ti 层切割的显着影响。次表面损伤是评估 CFRP 加工质量的最佳因素。