Suitable pitch difference to realize anti-loosening performance for various bolts-nuts diameter

2018 International Conference on Material Strength and Applied Mechanics

材料科学;力学

Kubo, S.^1 ; Tateishi, K.^1 ; Noda, N.-A.^1 ; Sano, Y.^1 ; Takase, Y.^1 ; Honda, K.^1

Mechanical Engineering Department, Kyushu Institute of Technology, 1-1 Sensui-cho, Tobata-ku, Kitakyushu-shi

804-8550, Japan^1

关键词: Anti-loosening;    Approximate formulas;    Connected structures;    Fatigue strength;    FEM simulations;    Nut connections;    Pitch differences;    Tightening process;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/372/1/012007/pdf
DOI  :  10.1088/1757-899X/372/1/012007

来源: IOP

【 摘 要 】

In bolt-nut connection, the anti-loosening performance and high fatigue strength are always required with low cost to ensure the connected structure's safety. In the previous study, a suitable pitch difference between the bolt-nut was obtained as α = 33 μm for M16 JIS bolt- nut through loosening experiment and FEM simulation for tightening process. However, other bolt-nut diameters have not been considered yet. In this paper, therefore, suitable pitch difference is considered for various diameters to realize anti-loosening performance. Since bolt-nut thread geometries are different depending on the diameter, they are expressed as approximate formula. Then, loosening force and anti-loosening force are considered by varying the diameter. Finally, suitable pitch difference αsuitminα αsuitmaxwas determined from mechanical condition.