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304不锈钢扁平头半空心厚壁铆钉翻铆缺陷分析

Analysis of riveting defects of 304 stainless steel flat head semi-hollow thick-walled rivets
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摘要 为了揭示304不锈钢扁平头半空心厚壁铆钉在翻铆过程中易出现压不到位、空心壁开裂和腰部镦粗等缺陷产生的原因,采用有限元、机理分析和实验的方法分析了半空心厚壁铆钉的制作及翻铆过程,获得了铆钉制作及翻铆时铆钉的应力场、硬度分布和显微组织。结果表明:翻铆时翻卷半径过小,材料在弯角内侧堆积,导致压不到位。铆钉空心壁在铆钉制作和翻铆过程中变形量最大,加工硬化最严重,且有部分马氏体相变,导致铆钉空心壁部分的伸长率大幅下降;翻铆时铆钉空心壁外翻直径过大,超过拉伸极限,则铆钉在硬度最高的空心壁处开裂。铆钉制作和翻铆时腰部变形量最小,硬度最低,当翻铆力大于其抗压缩失稳的能力时,则会在腰部发生镦粗。 To reveal the causes of the defects of 304 stainless steel flat head semi-hollow thick-wall rivets,such as inadequate pressure,hollow wall cracking and middle upsetting,the forming and riveting process of semi-hollow thick-walled rivets were analyzed by finite element method,mechanism analysis and experiment.The stress field,hardness distribution and microstructure of rivet during the forming and riveting process were obtained.The results show that when the roll radius is too small during riveting,the material accumulates inside the bend angle,which results in inadequate pressure.The rivet hollow wall has the largest deformation and hardening degree during the forming and riveting process,and some martensitic transformation occurs,which leads to the great decrease of the elongation of rivet hollow wall.When the diameter of rivet hollow wall is too large and exceeds the stretching limit,cracks occur at the hollow wall where the hardness is the highest.During the forming and riveting process,the deformation of rivet middle is the smallest and the hardness is the lowest.Upsetting occurs at the rivet middle when the riveting force is greater than its capability to resist compression instability.
作者 杨程 牛艳 王瑞静 姚杰 康佳 YANG Cheng;NIU Yan;WANG Rui-jing;YAO Jie;KANG Jia(School of Metallurgical Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,China)
出处 《塑性工程学报》 CAS CSCD 北大核心 2020年第3期65-71,共7页 Journal of Plasticity Engineering
基金 国家自然科学基金资助项目(51874226) 西安市科技局科技创新引导项目(201805033YD11CG17(10))。
关键词 304不锈钢 扁平头半空心铆钉 翻铆 加工硬化 显微组织 304 stainless steel flat head semi-hollow rivets riveting work hardening microstructure
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