Processing Experiments of Folding Defects and Fatigue Property in Short End Bolts

doi:10.3969/j.issn.1004-132X.2025.01.003

Abstract

Abstract: To elucidate the effects of thread rolling parameters and end configurations on the formation of folding defects, an experimental investigation was conducted on the thread end rolling processes and fatigue behavior, and the folds with different processing parameters were analyzed. The results show that for the folding in the end region, higher thread rolling speed and lower feed rate significantly mitigate the occurrence of folds. For the tooth base folding, increases in thread rolling speed and feed rate will initially reduce the number of folds. In terms of fatigue characteristics, increases in thread rolling speed and decreases in feed rate leads to a gradual reduction in fatigue cracks originating from folding defects. Consequently, the optimization of thread rolling process parameters and end groove configurations is essential for reducing the incidence of folding defects in short end bolts.

Key words: short end bolt, fold, thread rolling parameter, end groove configuration, fatigue property

摘要： 为揭示滚丝参数与收尾构型对折叠缺陷的影响规律，开展了螺纹收尾滚丝成形工艺与疲试实验，分析了不同加工参数下的折叠情况。结果表明：对于收尾区折叠，滚丝转速取较大值、进给量取较小值可有效减少折叠的形成；对于牙底折叠，随着滚丝转速、进给量取值的增大，折叠数量先减小后增大；对于疲劳特性，当滚丝转速增大、进给量减小时，由折叠缺陷发展成的疲劳裂纹逐渐减小。因此合理的滚丝工艺参数与收尾槽构型可有效减少螺栓收尾区折叠缺陷数量。

关键词: 短收尾螺纹, 折叠, 滚丝参数, 收尾构型, 疲劳特性

CLC Number:

ZHANG Zhenfeng2, 3, XU Xueshi1, LIN Zhongliang2, 3, TANG Wei2, 3, LI Haonan1, SHAN Longlong2, 3, BAI Qingshun1. Processing Experiments of Folding Defects and Fatigue Property in Short End Bolts[J]. China Mechanical Engineering, 2025, 36(01): 29-37.

张振峰2, 3, 许学石1, 林忠亮2, 3, 唐伟2, 3, 李浩楠1, 单垄垄2, 3, 白清顺1. 短收尾螺栓的折叠缺陷工艺实验及疲劳特性[J]. 中国机械工程, 2025, 36(01): 29-37.

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