A New Tightening Method of Bolt/Nut Assembly to Control the Clamping Force

Hashimura, Shinji; Komatsu, Kyoichi; Inoue, Chihiro; Nakao, Takayuki

doi:10.1299/jamdsm.2.896

Cited by 11 publications

(6 citation statements)

References 3 publications

(3 reference statements)

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“…This measurement is also used to check each bolt pre-tension that assemblers in real conditions when using a torque wrench. Because, as is known e.g., in [20] or in [21], the assembly tightened by the torque control method can vary considerably in the bolt pre-tension achieved, especially in the case of hand tightening. For that reason, many devices have been developed for complex screw fasteners, as for example in [22].…”

Section: Boltmentioning

confidence: 99%

“…Other references were crucial in terms of the design and execution of the experiment, e.g., basic information [18] or advanced information from N. Fric [19] about the limitations of strain gauging when using internal strain gauges in bolts. Publications [20][21][22] dealing with the issue of bolt tightening accuracy (achieving bolt preload) were also examined. This information serves mainly to show the scope of the bolted connections issue.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Symmetry of Tightened Parts on the Force in a Bolted Joint

et al. 2023

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This article discusses the issue of force behavior in a pre-tensioned bolt that is part of a symmetrical flange connection, loaded with an operating load parallel to the bolt axis. The first part describes the issue being dealt with in detail. The next part offers a brief description of the generally known theoretical approach to the solution, and also outlines the limitations of this approach. This part is followed by a theoretical analysis of working load behavior in the bolt of the analyzed device, using Finite Element Method (FEM). In this article, a comparison of several different approaches to the solution can be also found, followed by a description of the experiment preparation and its results. The obtained values also serve as a subject for reverse iterative analysis carried out using ANSYS software. The aim is to find a proper modification to the symmetric calculation model that would be consistent with the results of measurements from technical practice. All results achieved are described in the final part of the article.

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Section: Boltmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of Symmetry of Tightened Parts on the Force in a Bolted Joint

et al. 2023

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“…Compared to other methods, the pull-out method is more straightforward, less affected by environmental factors, and better suited for suspension bridges. Currently, there is limited research on the pull-out method; Hashimura et al [29,30] contended that the pull-out method can precisely control the preload, and obtained the relationship between the change in the stress-free portion's elongation at the bolt's end during the pulling process. Hashimura et al [31] proposed to use the pull-out method to detect the stiffness of the bolt clamping section, but the detected stiffness had a large error compared with the theoretical value.…”

Section: Introductionmentioning

confidence: 99%

A Study of Preload Detection Technology in Suspension Bridge Cable Clamp Bolts Based on the Pull-Out Method

Mu,

Zhu,

Zhou

et al. 2024

Buildings

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The pull-out method is a simple and effective method for detecting the preload of suspension bridge cable clamp bolts. However, research on the pull-out method is currently limited. The force principles governing the bolt during the pulling process are unclear, and the relationship between tension force and the desired preload remains uncertain. This paper aims to explore the force principles of bolts during the pull-out method detection process through a combined approach of theoretical analysis, full-scale test, and finite element simulation. The results indicate that the bolt preload increases during the pulling process. The preload detected by the pull-out method is not the initial preload of the bolt, but rather it exceeds the initial preload. The force relationships among various components are determined as follows: the preload subtracts the change value of the force exerted by the nut at the tension end, which equals the change value of tension force. Additionally, an analysis of the impact of the length of the bolt clamping section and the bolt area on the preload was conducted. Under the same bolt area, a shorter clamping section length corresponds to a greater increase in preload. With the same clamping section length, the increment of preload increases with the bolt area. These findings can serve as references for detecting and specifying the preload of the bolts.

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“…At present, the main method of the pre-tightening force control are: torque control method, torque-angle control method, yield point control method, bolt elongation control method using strain gauge or ultrasonic instrument, direct tension indication method, etc. [10,11] The torque method has a wide range of applications, making it the most widely used in the field of aero-engine bolt assembly [12]. However, due to the influence of surface roughness, material and structure of part, tightening speed and other factors, the friction coefficient and torque coefficient will exhibit significant uncertainty change [13,14].…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Bonding Analysis of Bolt Connection and Secondary Tightening Strategy

Qiao,

Zhao,

et al. 2023

Preprint

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The tightening process of aero-engine rotor bolt involves a nonlinear bonding stage, which poses challenges in achieving accurate control of the pre-tightening force using the way of torque control. This study proposes a secondary tightening control strategy that offers high precision and adaptability for controlling the bolt pre-tightening force based on the snug point. Firstly, we provide a detailed description of the variable stiffness process during the nonlinear bonding stage of bolt, based on theories related to bolt torque-pretension relationship and bolt deformation coordination relationship. Secondly, we design methods for extracting the snug point and calculating the target rotation angle through the Monte-Carlo simulation model and the linear goodness of fit evaluation mechanism. Thirdly, we experimentally investigate the effectiveness of this secondary tightening strategy using the typical connection section of aero-engine rotor flange bolt as our experimental object. The results indicate that applying this secondary tightening strategy can effectively mitigate uncertainties caused by nonlinear bonding and reduce errors resulting from variations in bolt characteristics and external conditions. Compared to torque control method and torque-angle control method, employing this secondary tightening strategy reduces the standard deviation of pre-tightening force from 1.875 and 1.031 to 0.536, thereby minimizing dispersion in pre-tightening force level. Additionally, it reduces maximum deviation of pre-tightening force from 30.9% and 20.1% to 2.8%, significantly enhancing accuracy in controlling bolt tightening.

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A New Tightening Method of Bolt/Nut Assembly to Control the Clamping Force

Cited by 11 publications

References 3 publications

Influence of Symmetry of Tightened Parts on the Force in a Bolted Joint

Influence of Symmetry of Tightened Parts on the Force in a Bolted Joint

A Study of Preload Detection Technology in Suspension Bridge Cable Clamp Bolts Based on the Pull-Out Method

Nonlinear Bonding Analysis of Bolt Connection and Secondary Tightening Strategy

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