钻削CFRP的双顶角钻头磨损及抑制新方法

doi:10.3901/JME.2018.15.171

机械工程学报 ›› 2018, Vol. 54 ›› Issue (15): 171-179.doi: 10.3901/JME.2018.15.171

钻削CFRP的双顶角钻头磨损及抑制新方法

王福吉, 钱宝伟, 成德, 贾振元, 付饶, 殷俊伟

大连理工大学精密与特种加工教育部重点实验室大连 116024

收稿日期:2017-08-18 修回日期:2017-11-19 出版日期:2018-08-05 发布日期:2018-08-05
通讯作者: 王福吉(通信作者),男,1974年出生,博士,教授,博士研究生导师。主要研究方向为碳纤维增强复合材料高质高效加工方法。E-mail:wfjsll@dlut.edu.cn
作者简介:钱宝伟,男,1990年出生,硕士研究生。主要研究方向为碳纤维增强复合材料制孔加工刀具磨损。E-mail:173487701@qq.com
基金资助:
NSFC-辽宁联合基金重点项目（U1508207）、国家自然科学基金（51575082）、国家重点基础研究发展计划（973计划，2014CB046503）、国家创新群体（51621064）和基本科研业务费专项资金（DUT16TD01）资助项目。

Wear of One-shot Drill Bit in Drilling CFRP and Novel Method for Tool Wear Reduction

WANG Fuji, QIAN Baowei, CHENG De, JIA Zhenyuan, FU Rao, YIN Junwei

Key Laboratory for Precision and Non-traditional Machining Technology of Ministry of Education, Dalian University of Technology, Dalian 116024

Received:2017-08-18 Revised:2017-11-19 Online:2018-08-05 Published:2018-08-05

摘要/Abstract

摘要： 为满足高性能碳纤维增强复合材料（CFRP）结构件的高质量制孔需求，现阶段广泛采用双顶角钻头钻削CFRP，但因其“钻、扩、铰”一体的结构形式，双顶角钻头第二主切削刃的磨损程度和状态是决定钻削孔壁质量的关键因素。此外，由于CFRP中碳纤维磨蚀性强，制孔中钻头快速磨损，切削刃严重钝化，极易导致孔壁损伤。通过引入切削刃钝圆半径，揭示双顶角钻头第二主切削刃钝化后，在严重的后刀面磨损作用下，第二主切削刃刃口钝圆半径又减小的磨损机制，在此基础上，结合不同纤维切削角下CFRP成屑机制，详细探究了双顶角钻头第二主切削刃钝化状态对钻削孔壁损伤的影响规律；最后创新性地在钻头第二主切削刃末端开设内冷孔，利用微量冷却润滑（MQL）工艺，实现了钻头第二主切削刃钝化磨损的有效抑制，显著提升了高性能碳纤维增强复合材料的制孔质量，为高质量复合材料制孔工艺和工具研究奠定了重要基础。

关键词: 第二主切削刃, 孔壁质量, 切削刃钝化, 碳纤维增强复合材料(CFRP), 微量冷却润滑(MQL)

Abstract: In order to satisfy high quality requirements of drilled holes on high strength carbon fiber reinforced plastics (CFRP) structural parts, one-shot drill bit is currently utilized in drilling CFRP. However, due to the special step-drilling (including pre-drilling, chambering and reaming) geometry of the one-shot drill bit, the wear status of secondary cutting edges determines the final hole surface quality. Also on account of high abrasiveness of carbon fibers, the drill bit suffers quick tool wear and the cutting edges usually encounter edge dulling, which leads to subsequent serious hole surface defects. By applying cutting edge rounding to characterize the dullness of the cutting edge, the results show the secondary cutting edge is prone to dulling at initial drilling stage, and then it is reground and re-sharpened. On the basis of tool wear analysis, the paper investigates the impacts of edge dulling on drilled hole surface defects under different fiber cutting angles. Finally by creatively designing internal coolant holes at specific position on the secondary cutting edge and applying minimum quantity lubrication (MQL), the dulling wear of secondary cutting edge is effectively reduced and hole surface quality is greatly improved. The study paves the way for the research on tools and processes of drilling CFRP with high quality.

Key words: carbon fiber reinforced plastics(CFRP), cutting edge dulling, hole surface quality, minimum quantity lubrication(MQL), secondary cutting edge

中图分类号:

TB332

王福吉, 钱宝伟, 成德, 贾振元, 付饶, 殷俊伟. 钻削CFRP的双顶角钻头磨损及抑制新方法[J]. 机械工程学报, 2018, 54(15): 171-179.

WANG Fuji, QIAN Baowei, CHENG De, JIA Zhenyuan, FU Rao, YIN Junwei. Wear of One-shot Drill Bit in Drilling CFRP and Novel Method for Tool Wear Reduction[J]. Journal of Mechanical Engineering, 2018, 54(15): 171-179.

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钻削CFRP的双顶角钻头磨损及抑制新方法

Wear of One-shot Drill Bit in Drilling CFRP and Novel Method for Tool Wear Reduction

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