Three-dimensional finite element analysis for prevailing torque of bolt-nut connection having slight pitch difference
Three-dimensional finite element analysis for prevailing torque of bolt-nut connection having slight pitch difference
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DOI：
10.1007/s12206-020-0522-8
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发表时间：
2020-05
影响因子：
1.6
通讯作者：
N. Noda;Xi Liu;Y. Sano;K. Tateishi;Biao Wang;Y. Takase
中科院分区：
文献类型：
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作者：
N. Noda;Xi Liu;Y. Sano;K. Tateishi;Biao Wang;Y. Takase
在广阔的工业领域中，螺栓-螺母连接作为一种重要的机械部件得到了广泛的应用和统一。为了提高安全性和降低成本，总是需要物美价廉、防松性能优良的螺栓-螺母连接。在本文中，考虑了螺母和螺栓螺纹之间的轻微节距差异，通过关注当前扭矩来提高防松性。首先，在螺母拧紧过程中，由于以前的fa1是用轴对称有限元模拟来研究的，因此研究了由节距差引起的螺栓轴向力，以代替现行扭矩。其次，通过三维有限元模拟，通过改变节距差，直接分析了现行转矩。所得到的螺母旋转所需的普遍扭矩与实验测量值一致。最后，考虑到有时包含的制造误差，通过螺母螺纹与螺栓螺纹接触的数量来确定螺母的实际节差，并进行了实验测量。然后，通过三维有限元模拟得到的主导转矩，验证了α的正确性。
In a vast industrial field, the bolt-nut connection is widely used and unitized as an important machine component. In order to improve safety and for cost reduction, cheap bolt-nut connections with excellent anti-loosening performance are always needed. In this paper, the slight pitch difference is considered between the nut and bolt threads to improve the anti-loosening by focusing on the prevailing torqueTp. In the first place, during the nut screwing process, the bolt axial forceFacaused by the pitch difference is examined because previouslyFawas studied by the axisymmetric FEM simulation as a substitute of the prevailing torqueTp. Next, the prevailing torqueTpis directly analyzed by changing the pitch difference through the 3D FEM simulation. The obtained prevailing torque needed for the nut rotation is in consonance with the measured value experimentally. By considering manufacturing error sometimes included, finally, the real pitch difference or of the nut is identified from the number of nut thread in contact with the bolt thread, which is measured experimentally. Then, the correctness of this α is confirmed through the prevailing torque obtained by 3D FEM simulation.