碳纤维复合材料/钛合金叠层钻孔质量研究

doi:10.3901/JME.2016.11.177

机械工程学报 ›› 2016, Vol. 52 ›› Issue (11): 177-185.doi: 10.3901/JME.2016.11.177

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碳纤维复合材料/钛合金叠层钻孔质量研究

南成根^{1, 2}, 吴丹¹, 马信国¹, 陈恳¹

1. 清华大学机械工程系北京 100084;
2. 空军驻吉林地区军事代表室吉林 132021

出版日期:2016-06-05 发布日期:2016-06-05
作者简介:南成根,男,1980年出生,博士研究生。主要研究方向为复合材料及金属叠层切削工艺。E-mail：ncg11@mails.tsinghua.edu.cn;吴丹(通信作者),女,1966年出生,博士,教授,博士研究生导师。主要研究方向为异形表面和难加工材料叠层加工原理、工艺与装备。E-mail：wud@mail.tsinghua.edu.cn
基金资助:
摩擦学国家重点实验室科学基金资助项目(SKLT2015B01)

Study on the Drilling Quality of Carbon Fiber Reinforced Plastic and Titanium Stacks

NAN Chenggen^{1, 2}, WU Dan¹, MA Xinguo¹, CHEN Ken¹

1. Department of Mechanical Engineering, Tsinghua University, Beijing 100084;
2. Air Force Military Representative Office in Jilin Area, Jilin 132021

Online:2016-06-05 Published:2016-06-05

摘要/Abstract

摘要： 碳纤维复合材料(Carbon fiber reinforced plastic, CFRP)/钛合金叠层的钻孔机理不同于单层材料钻孔,钛合金切屑在排出孔外过程中会对CFRP孔质量造成损伤。为了探究CFRP在叠层钻孔时的质量特性,设计正交试验分析了钛合金切屑和切削参数对CFRP层钻孔质量的影响。观察了轴向切削力和力矩的变化以及钛合金切屑形态,分析CFRP层孔径超差和入口撕裂的机理。结果表明：大进给量条件下,高温、高硬度的钛合金切屑会对CFRP产生严重的侵蚀,是导致CFRP孔径超差的主要原因,并会增大入口撕裂程度;CFRP入口撕裂主要产生在切削速度和纤维方向夹角θ=45 °的位置,低切削速度不利于切削CFRP,会加大入口撕裂程度。因此,应使用小进给量钻削钛合金层,使用大切削速度钻削CFRP层;在保证钻头强度的前提下,推荐使用具有较大容屑空间的钻头。

关键词: 叠层钻孔, 加工质量, 钛合金, 碳纤维复合材料

Abstract: The mechanism in drilling carbon fiber reinforced plastic (CFRP) and titanium stack materials differs from that in drilling single material. Titanium chips evacuation through the hole deteriorates the CFRP hole quality. To investigate the quality characteristics of CFRP-layer in drilling of CFRP/Ti stacks, orthogonal experiments are designed for analyzing the effects of both titanium chips and cutting parameters on drilling performance of CFRP-layer. The thrust force, torque and titanium chip morphology are firstly observed. Then the mechanism of hole diameter out of tolerance and entrance spalling is studied. The results show that, with higher feed rate, titanium chips with high temperature and high hardness cause catastrophic erosion of the CFRP-layer, resulting in hole diameter out of tolerance, and increase of entrance spalling. The entrance spalling occurs when the cutting direction and the fibers create a 45 ° angle. Low cutting speed is not suitable for CFRP-layer machining, which worsens the entrance spalling. Therefore, low feed rate and high cutting speed are recommended for drilling of titanium and CFRP layers respectively. Under the premise of enough strength, the drill with larger chip flute is recommended.

Key words: carbon fiber reinforced plastic, machining quality, stack materials drilling, titanium

中图分类号:

TH16

南成根, 吴丹, 马信国, 陈恳. 碳纤维复合材料/钛合金叠层钻孔质量研究[J]. 机械工程学报, 2016, 52(11): 177-185.

NAN Chenggen, WU Dan, MA Xinguo, CHEN Ken. Study on the Drilling Quality of Carbon Fiber Reinforced Plastic and Titanium Stacks[J]. Journal of Mechanical Engineering, 2016, 52(11): 177-185.

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碳纤维复合材料/钛合金叠层钻孔质量研究

Study on the Drilling Quality of Carbon Fiber Reinforced Plastic and Titanium Stacks

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