异材夹层条件下不同工艺制备孔结构表面完整性和疲劳性能试验研究  

Experimental Study on Surface Integrity and Fatigue Performance of Dissimilar Material Stack-Structured Holes Manufactured by Different Processing Method

作　　者：董志鹏 王燕礼 姚亮亮 杨帆 刘维[1] DONG Zhipeng;WANG Yanli;YAO Liangliang;YANG Fan;LIU Wei(PLA 32256 Units,Nanning 530000,China;The First Military Representative Office of the Military Equipment Department of the Army in Chongqing Region in Kunming,Kunming 650021,China;Non-Commissioned Officer School of Army Academy of Armored Forces,Changchun 130000,China)

机构地区：[1]中国人民解放军32256部队,南宁530000 [2]陆军装备部驻重庆地区军事代表局驻昆明地区第一军事代表室,昆明650021 [3]陆军装甲兵学院士官学校,长春130000

出　　处：《航空制造技术》2020年第17期32-39,75,共9页Aeronautical Manufacturing Technology

摘　　要：为研究异材夹层结构对不同工艺制备孔表面完整性和疲劳性能的影响,在夹层条件下采用钻–铰、滚光、冷挤压3种工艺制备了φ8.36mm终孔,开展了表面形貌、表面粗糙度、表面残余应力、微观组织结构分析,以及疲劳试验和断口分析。结果表明,滚光在夹层孔端形成明显飞边,在7B04–T6孔端形成环状滚压微裂纹。冷挤压在衬套开缝对应夹层7B04–T6孔端区域形成挤压微裂纹。在文中疲劳载荷条件下,99.9%存活率、95%置信度时,滚光分别提高7B04–T6和TA15孔疲劳寿命0.01倍和0.63倍;A冷挤压量提高7B04–T6孔疲劳寿命3.25倍,但会降低TA15孔疲劳寿命;B冷挤压量分别提高7B04–T6和TA15孔疲劳寿命18倍和3.30倍;3类孔结构疲劳源均从孔壁或孔角萌生,没有从挤压或滚压微裂纹处萌生。In order to study the effect of the dissimilar material stack-structure on the surface integrity and fatigue properties of holes,under the stacked condition,?8.36mm holes were prepared by different processes,such as drilling&reaming,burnishing,and split sleeve cold expansion(SSCX).The surface morphology,surface roughness,residual stress and microstructure were investigated.Fatigue test and fracture surface analysis were performed.The results show that burnishing forms obvious material pile-up at the end of the interlayer hole and introduces circle-shaped micro-crack around the 7B04–T6 hole,while SSCX imparts micro-crack in the region corresponding to sleeve split.Under fatigue loading conditions in present paper,burnishing increases the fatigue life(99.9%survival rate,95%confidence)of 7B04–T6 and TA15 hole structures by 0.01 times and 0.63 times,and SSCX with interference value of A increases that of 7B04–T6 hole by 3.25 times but reduces that of TA15 holes,while SSCX with interference value of B increases that of 7B04–T6 and TA15 by 18 times and 3.30 times,respectively.The fatigue sources of the three types of hole all originate from the hole wall or corner,and never start from the micro cracks of cold expansion or burnishing.

关 键 词：夹层结构 孔 滚光 开缝衬套挤压 表面完整性 疲劳性能 

分 类 号：TJ05[兵器科学与技术—兵器发射理论与技术]