王燕礼,卞小芳,符彬,曹强.光整滚光和开缝衬套挤压孔结构表面完整性及疲劳行为研究[J].表面技术,2019,48(9):336-345.
WANG Yan-li,BIAN Xiao-fang,FU Bin,CAO Qiang.Surface Integrity and Fatigue Behaviour of Holes Treated by Finishing & Burnishing and Split Sleeve Cold Expansion[J].Surface Technology,2019,48(9):336-345
光整滚光和开缝衬套挤压孔结构表面完整性及疲劳行为研究
Surface Integrity and Fatigue Behaviour of Holes Treated by Finishing & Burnishing and Split Sleeve Cold Expansion
投稿时间:2019-03-07  修订日期:2019-09-20
DOI:10.16490/j.cnki.issn.1001-3660.2019.09.041
中文关键词:  光整滚光  开缝衬套挤压  孔结构  表面完整性  疲劳行为
英文关键词:finishing & burnishing  split sleeve cold expansion  fastener hole  surface integrity  fatigue behavior
基金项目:
作者单位
王燕礼 1.国营芜湖机械厂,安徽 芜湖 241000;2.陆军装甲兵学院,北京 100072 
卞小芳 3.中国人民解放军93501部队,北京 100005 
符彬 1.国营芜湖机械厂,安徽 芜湖 241000 
曹强 1.国营芜湖机械厂,安徽 芜湖 241000 
AuthorInstitution
WANG Yan-li 1.State Wuhu Machinery Factory, Wuhu 241000, China; 2.Army Academy of Armored Forces, Beijing 100072, China 
BIAN Xiao-fang 3.PLA 93501 Troops, Beijing 100005, China 
FU Bin 1.State Wuhu Machinery Factory, Wuhu 241000, China 
CAO Qiang 1.State Wuhu Machinery Factory, Wuhu 241000, China 
摘要点击次数:
全文下载次数:
中文摘要:
      目的 澄清光整滚光和开缝衬套挤压孔结构疲劳行为和强化机制的区别。方法 采用传统钻-铰、光整滚光、开缝衬套挤压等三种不同工艺,制备TA15钛合金含ø8.75中心圆孔疲劳试样,通过恒幅拉-拉对比疲劳试验和疲劳数据统计分析方法,评价不同工艺制备孔结构的抗疲劳性能。采用体式显微镜观察孔端和孔壁形貌,用触针式表面粗糙度轮廓仪测试孔壁表面粗糙度,用X射线衍射应力测定法测定孔端表面残余应力,用透射电子显微镜观察孔壁材料微观结构,用显微硬度计测定孔壁显微硬度点阵等技术和方法,分析了不同工艺制备孔结构表面完整性。通过扫描电子显微镜标定疲劳断口辉纹平均间距与裂纹长度,用数码长焦显微镜标定孔端表面裂纹长度与疲劳循环周次的关系,并定量分析了不同工艺制备的孔结构疲劳裂纹萌生寿命和裂纹扩展速率。结果 光整滚光和挤压强化分别提高连接孔中值疲劳寿命63%和317%。光整滚光可降低孔壁表面粗糙度Ra至0.52 μm,但改变孔壁附近残余应力状态能力有限,且会在孔端形成尖锐的材料凸瘤;挤压强化后,孔壁表面粗糙度Ra为0.73 μm,在孔壁引入4 mm深、峰值达-500 MPa的残余压应力区,并大幅提高孔壁材料位错密度,且孔端无材料凸瘤产生。结论 光整滚光提高孔结构疲劳寿命的主要机制是,通过降低孔壁表面粗糙度延长裂纹萌生寿命。挤压强化主要机制是,通过引入大深度、高幅值的残余压应力和改善材料微观结构延长裂纹萌生寿命和裂纹扩展寿命。因此,挤压强化优于光整滚光技术。考虑到实际机械结构中多为叠层特征孔结构,挤压强化因为不会在孔端遗留材料凸瘤,更有利于保证夹层间隙安装要求。
英文摘要:
      The work aims to disclose the differences of fatigue performances and surface integrity of holes treated by split sleeve cold expansion and finishing & burnishing. The fatigue samples containing central hole manufactured with titanium TA15 were processed by three different methods such as traditional drilling & reaming, finishing & burnishing and split sleeve cold expansion. Then, the fatigue tests and the statistical analysis methods of fatigue data were compared by constant amplitude to assess the fatigue performances of holes prepared by different technologies. The surface integrity of holes prepared by different technologies was analyzed by the followed techniques and methods. For example, the morphology of hole end and wall was observed by integrated microscope, the surface roughness of hole wall was tested by stylus surface roughness profiler, the surface residual stress on hole end was determined by XRD, the microstructure of hole wall was observed by TEM and the micro hardness was determined by micro hardness tester. SEM was used to calibrate the average spacing between striations on fatigue fracture surfaces and the crack length. Digital telephoto microscopy was used to calibrate the relationship between the crack length on the surface of the hole end and the number of fatigue cycles, thus quantitatively analyzing the fatigue nucleation life and crack propagation rate of the hole structures prepared by different processes. Finishing & burnishing and split sleeve cold expansion increased the median fatigue life with value of 63% and 317%, respectively. Finishing & burnishing could reduce the surface roughness Ra to 0.52 μm, but produced a sharp material pile up at hole end. Split sleeve cold expansion could reduce the surface roughness Ra to 0.73 μm, while simultaneously introducing a~4 mm deep residual compressive stress zone with a peak value of -500 MPa and increasing the dislocation density of material close to hole wall, without materials piled up at hole end. The main strengthening mechanism of finishing & burnishing is to minimize the surface roughness to extend fatigue nucleation life. On a contrary, split sleeve cold expansion is to impart a high-value and large-depth residual compressive stress zone and simultaneously improve the material microstructure to extend both fatigue nucleation life and crack growth life. Therefore, split sleeve cold expansion is better than finishing & burnishing. Considering that laminated hole structure are often used in actual mechanical equipment, split sleeve cold expansion is clearly more conducive to guarding the interlayer gap installation requirement, because split sleeve cold expansion do not produce pileup on the interlayer.
查看全文  查看/发表评论  下载PDF阅读器
关闭

关于我们 | 联系我们 | 投诉建议 | 隐私保护 | 用户协议

您是第19500010位访问者    渝ICP备15012534号-3

版权所有:《表面技术》编辑部 2014 surface-techj.com, All Rights Reserved

邮编:400039 电话:023-68792193传真:023-68792396 Email: bmjs@surface-techj.com

渝公网安备 50010702501715号