Outlet Damage Mechanism and Multi Parameter Optimization Design for CFRP Interlaminar Drilling

doi:10.3901/JME.2025.19.430

Abstract

Abstract: Carbon fiber reinforced plastics (CFRP) have been widely used in the core fields of aerospace, military industry and national defense due to their excellent properties. Drilling is the most common way to achieve hole making of CFRP. Aimed to meet the needs of some special scenes, the new interlaminar drilling mode with the main characteristics of drilling direction parallel to the CFRP interlaminar interfaces begins to emerge. The formation mechanism and influencing factors of the outlet damage have become the key to restrict the interlaminar drilling technology of CFRP. According to the method of combining theory with experiment, the formation mechanism of outlet damage for CFRP interlaminar drilling is studied, the influence laws of factors such as drill bit angles and machining parameters are discussed, the mathematical prediction models of axial force and outlet damage for CFRP interlaminar drilling are constructed, and the multi parameter optimization design with the goal of low axial force and low damage is further carried out. The results show that the outlet damage of interlaminar drilling is mainly affected by the main and auxiliary cutting edges, while the influence of the chisel edge is little. At the outlet of interlaminar drilling, the 0° fiber layer mainly produces fiber peeling damage, and the fiber fracture mode of 90° fiber layer mainly depends on the fiber cutting angle, forming the interlayer tear damage in 45° or 135° fiber layer. With the increase of tip angle, the axial force increases, and the burr and interlayer tear of the outlet decrease. The influence of helix angle on the axial force is relatively little, but increasing the helix angle can reduce the burr of outlet. With the increase of feed rate, the axial force increases and the comprehensive damage factor decreases, while the influence of spindle speed is not obvious. In order to obtain the lower axial force and outlet damage, the matching combination of tool angles and machining parameters recommended in this work is as follows: the tip angle is 80.5°, the helix angle is 15.2°, the spindle speed is 11 385 r/min, and the feed rate is 0.010 6 mm/r.

Key words: CFRP, interlaminar drilling, outlet damage, drill bit angle, machining parameters

CLC Number:

TB332

LI Shujian, LI Qingqing, YANG Peng, LIU Xiangyu, LI Changping, LI Pengnan. Outlet Damage Mechanism and Multi Parameter Optimization Design for CFRP Interlaminar Drilling[J]. Journal of Mechanical Engineering, 2025, 61(19): 430-442.

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