Thread rolling and performance evaluations of a new anti-loosening double thread bolt combining a single thread and multiple threads

Shinbutsu, Toshinaka; Amano, Shuichi; Takemasu, Teruie; Kuwabara, Toshihiko; Shimura, Jyo

doi:10.1016/j.proeng.2017.10.1028

Cited by 7 publications

(2 citation statements)

References 4 publications

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“…Peter Groche [7] and others explored the simulation model of flat die thread rolling to investigate the influence of load and friction on the rolling process. Shinbutsu T [8] developed an improved three-thread structure, DTB-II, and confirmed its reliability through simulation and experiments. Domblesky J P [9] analyzed the impact of different friction coefficients, flow stresses, and blank diameters on effective strain and thread height using the finite element method.…”

Section: Introductionmentioning

confidence: 86%

Orthogonal Simulation Optimization of GH4169 Bolt Thread Rolling Process Parameters

Zheng

et al. 2023

Preprint

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GH4169 alloy is a precipitation-strengthened nickel-chromium-iron-based superalloy, widely known for its challenging machinability in thread rolling processes. The optimization of bolt thread rolling process parameters holds significant research importance, particularly for ensuring batch stability in the production of high-end aerospace fasteners. GH4169 bolts are prone to metallographic folding in the crest and root areas after thread rolling, necessitating the urgent need to optimize the thread rolling process parameters. In this study, a finite element simulation model of the GH4169 bolt thread rolling process was established using ABAQUS software. The thread rolling process parameters, including the feed speed of the thread rolling die, feed speed of the thread rolling die, and initial temperature of the workpiece, were optimized through orthogonal simulation. It was found that, while meeting the technical requirements, a smaller thread forming force yielded better results. Range analysis and variance analysis were conducted on the simulation results to determine the influence trend and significance degree of the thread rolling process parameters on the thread forming force. The research findings of this study can effectively guide actual production processes and significantly reduce exploration time in the GH4169 bolt thread rolling process for enterprises.

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Section: Introductionmentioning

confidence: 86%

Orthogonal Simulation Optimization of GH4169 Bolt Thread Rolling Process Parameters

Zheng

et al. 2023

Preprint

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“…Wang et al (2020) indicated that the shear capacity of Hollo bolts is much higher than the normal bolt but the fatigue life is slightly higher than that of normal bolts. To improve both anti-loosening and fatigue strength, Shinbutsu et al (2017) designed a new bolt fastener with the double nut structure, named DTB-II, having practically sufficient tensile strength and excellent anti-loosening performance. The authors’ previous researches indicated that a slight pitch difference in bolt–nut improves the fatigue life and the anti-loosening performance (Chen et al, 2015, 2016; Noda et al, 2016).…”

Section: Fatigue Strength Improvementmentioning

confidence: 99%

Effects of root radius and pitch difference on fatigue strength and anti-loosening performance for high strength bolt–nut connections

Noda

Wang

Oda

et al. 2021

Advances in Structural Engineering

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The fatigue strength improvement and anti-loosening performance are studied experimentally and analytically for JIS M16 bolt–nut connections. Three different root radii are considered coupled with three different pitch differences. The enlarging the bolt root radius improves the fatigue limit of the bolt by more than 30% because both stress amplitude and mean stress can be reduced. Furthermore, suitable pitch difference improves the fatigue limit by more than 25%. This is because under no pitch difference the crack initiation always occurs at No.1 or No.2 threads close to the bolt head causing the final failure; however, under a suitable pitch difference the crack initiation occurs at No.6 or No.7 threads far away from the bolt head. Good anti-loosening performance can be expected for the bolt–nut connections having enlarged root radius because the prevailing torque [Formula: see text] = 19 Nm and the residual prevailing torque [Formula: see text] are not smaller compared to other special bolt–nut connections.

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Development of Anti-Loosening Bolts Based on Innovative Double Thread Mechanism

Takemasu¹,

Shinbutsu²,

Amano³

et al. 2021

Forming the Future

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Thread rolling and performance evaluations of a new anti-loosening double thread bolt combining a single thread and multiple threads

Cited by 7 publications

References 4 publications

Orthogonal Simulation Optimization of GH4169 Bolt Thread Rolling Process Parameters

Orthogonal Simulation Optimization of GH4169 Bolt Thread Rolling Process Parameters

Effects of root radius and pitch difference on fatigue strength and anti-loosening performance for high strength bolt–nut connections

Development of Anti-Loosening Bolts Based on Innovative Double Thread Mechanism

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