Article(id=1210383070847439167, tenantId=1146029695717560320, journalId=1189873562199433220, issueId=1210383066325971495, articleNumber=null, orderNo=null, doi=10.19710/J.cnki.1003-8817.20230029, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=research-article, receivedDate=null, receivedDateStr=null, revisedDate=null, revisedDateStr=null, acceptedDate=null, acceptedDateStr=null, onlineDate=1766507411920, onlineDateStr=2025-12-24, pubDate=1705680000000, pubDateStr=2024-01-20, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1766507411920, onlineIssueDateStr=2025-12-24, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1766507411920, creator=13701087609, updateTime=1766507411920, updator=13701087609, issue=Issue{id=1210383066325971495, tenantId=1146029695717560320, journalId=1189873562199433220, year='2024', volume='', issue='1', pageStart='1', pageEnd='72', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1766507410842, creator=13701087609, updateTime=1766507410842, updator=13701087609, preIssue=null, nextIssue=null, ext=null, issueFiles=null}, startPage=50, endPage=54, ext={EN=ArticleExt(id=1210383071111680330, articleId=1210383070847439167, tenantId=1146029695717560320, journalId=1189873562199433220, language=EN, title=Failure Analysis of Eccentric Bolt with Abnormal Rotation, columnId=null, journalTitle=Automobile Technology & Material, columnName=null, runingTitle=null, highlight=null, articleAbstract=
After the vehicle abuse road test, the eccentric bolt connecting spring swing arm and subframe rotates mainly because the flange surface of the bolt is convex, the friction on the flange surface is uneven, and the friction coefficient does not meet the standard requirements (standard value: 0.08~016, measured value: head friction coefficient is 0.25~0.27, and the total friction coefficient is 0.18~0.20). The friction surface of flange is line contact. Compared with the surface contact, this kind of bolt has poor anti-loose and anti-rotation performance. Improve the flatness of the bolt flange surface and the uniformity of the friction surface by the following measures: reducing the step height at the hexagon connection of bolts (from 3.2~3.25 mm to 3.1~3.15 mm), increasing the hole diameter of gasket before riveting (from 13.85~13.9 mm to 14.3~14.35 mm) and making the gasket into an opposite angle before riveting (0.5°~1°). The friction coefficient of optimized bolt is qualified, and there is no abnormal rotation failure after the vehicle abuse road test.
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整车滥用路试试验后,偏心螺栓(连接弹簧摆臂和副车架)出现转动的主要原因为螺栓法兰面内凸,法兰面摩擦不均匀,摩擦因数不符合标准(标准值:0.08~0.16,实测值:头部摩擦因数为0.25~0.27,总的摩擦因数为0.18~0.20)。法兰摩擦面为线接触,相比于面接触,线接触螺栓的防松和防转动性能较差。通过降低螺栓六角连接处台阶高度(由3.2~3.25 mm降低至3.1~3.15 mm)、增大垫片铆接前的孔径(由13.85~13.9 mm增大至14.3~14.35 mm)、将铆接前的垫片做成反角度(0.5°~1°)进行优化,结果表明,以上措施提升了螺栓法兰面的平面度和摩擦面的均匀性,优化后的螺栓摩擦因数合格,整车滥用路试试验后未出现异常转动失效。
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柯胜蓝(1975—),男,硕士学位,研究方向为汽车材料质量控制及管理。
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柯胜蓝(1975—),男,硕士学位,研究方向为汽车材料质量控制及管理。
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失效件自锁螺母金相图, figureFileSmall=fIUGF+hFyLzOysy4r+XQ7A==, figureFileBig=k5byS5j4kgO1G0HJCHMpNA==, tableContent=null), ArticleFig(id=1210383075482145332, tenantId=1146029695717560320, journalId=1189873562199433220, articleId=1210383070847439167, language=EN, label=null, caption=null, figureFileSmall=YzccLjSUCKhOOpSsce3+7g==, figureFileBig=zJvtGhoePjR1i14VRfFxRw==, tableContent=null), ArticleFig(id=1210383075557642808, tenantId=1146029695717560320, journalId=1189873562199433220, articleId=1210383070847439167, language=CN, label=图4, caption=
失效件偏心螺栓金相图, figureFileSmall=YzccLjSUCKhOOpSsce3+7g==, figureFileBig=zJvtGhoePjR1i14VRfFxRw==, tableContent=null), ArticleFig(id=1210383075637334587, tenantId=1146029695717560320, journalId=1189873562199433220, articleId=1210383070847439167, language=EN, label=null, caption=null, figureFileSmall=eKTBwV/48Mce15n8GEoTqw==, figureFileBig=any0u+Qil1zqcWU1f9lSzQ==, tableContent=null), ArticleFig(id=1210383075704443454, tenantId=1146029695717560320, journalId=1189873562199433220, articleId=1210383070847439167, language=CN, label=图5, caption=
偏心螺栓法兰状态, figureFileSmall=eKTBwV/48Mce15n8GEoTqw==, figureFileBig=any0u+Qil1zqcWU1f9lSzQ==, tableContent=null), ArticleFig(id=1210383075775746625, tenantId=1146029695717560320, journalId=1189873562199433220, articleId=1210383070847439167, language=EN, label=null, caption=null, figureFileSmall=zRPXALdK0x6muoSWBy0OXg==, figureFileBig=2jvOEmrCaYKui/59EDMhjA==, tableContent=null), ArticleFig(id=1210383075855438404, tenantId=1146029695717560320, journalId=1189873562199433220, articleId=1210383070847439167, language=CN, label=图6, caption=
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| 测试项 | 标准值 | 实测值 | 评价 |
| 拧入扭矩/N·m | <10.5 | 5.5~6.5 | 合格 |
| 第1次松脱扭矩/N·m | >3.1 | 6.1~7.5 | 合格 |
| 第3次松脱扭矩/N·m | >2.1 | 5.3~6.5 | 合格 |
| 总摩擦因数 | 0.10~0.16 | 0.122~0.132 | 合格 |
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自锁螺母拧入扭矩和总摩擦因数测试结果
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| 测试项 | 标准值 | 实测值 | 评价 |
| 拧入扭矩/N·m | <10.5 | 5.5~6.5 | 合格 |
| 第1次松脱扭矩/N·m | >3.1 | 6.1~7.5 | 合格 |
| 第3次松脱扭矩/N·m | >2.1 | 5.3~6.5 | 合格 |
| 总摩擦因数 | 0.10~0.16 | 0.122~0.132 | 合格 |
), ArticleFig(id=1210383076551692893, tenantId=1146029695717560320, journalId=1189873562199433220, articleId=1210383070847439167, language=EN, label=null, caption=null, figureFileSmall=null, figureFileBig=null, tableContent=
| 位置 | 标准值 | 实测值 | 评价 |
| 1 | 295~353 | 312 | 合格 |
| 2 | 321 |
| 3 | 318 |
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失效件自锁螺母硬度测试结果 HV10
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| 位置 | 标准值 | 实测值 | 评价 |
| 1 | 295~353 | 312 | 合格 |
| 2 | 321 |
| 3 | 318 |
), ArticleFig(id=1210383076694299236, tenantId=1146029695717560320, journalId=1189873562199433220, articleId=1210383070847439167, language=EN, label=null, caption=null, figureFileSmall=null, figureFileBig=null, tableContent=
| 位置 | 标准值 | 实测值 |
| 1 | 320~370 | 361 |
| 2 | 364 |
| 3 | 368 |
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失效件偏心螺栓硬度测试 HV10
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| 位置 | 标准值 | 实测值 |
| 1 | 320~370 | 361 |
| 2 | 364 |
| 3 | 368 |
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| 标准值 | 实测值 |
头部摩擦 因数 | 螺纹摩擦 因数 | 总的摩擦 因数 | 评价 |
| 0.08~0.16 | 0.25~0.27 | 0.11~0.12 | 0.18~0.20 | 不合格 |
), ArticleFig(id=1210383076971123312, tenantId=1146029695717560320, journalId=1189873562199433220, articleId=1210383070847439167, language=CN, label=表4, caption=
偏心螺栓摩擦因数测试结果
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| 标准值 | 实测值 |
头部摩擦 因数 | 螺纹摩擦 因数 | 总的摩擦 因数 | 评价 |
| 0.08~0.16 | 0.25~0.27 | 0.11~0.12 | 0.18~0.20 | 不合格 |
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| 标准值 | 实测值 |
头部摩擦 因数 | 螺纹摩擦 因数 | 总的摩擦 因数 | 评价 |
| 0.08~0.16 | 0.095~0.101 | 0.107~0.118 | 0.102~0.108 | 合格 |
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优化后的偏心螺栓摩擦因数测试结果
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| 标准值 | 实测值 |
头部摩擦 因数 | 螺纹摩擦 因数 | 总的摩擦 因数 | 评价 |
| 0.08~0.16 | 0.095~0.101 | 0.107~0.118 | 0.102~0.108 | 合格 |
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