A contribution to the selection and calculation of screws in high duty bolted joints

Croccolo, Dario; Agostinis, Massimiliano De; Vincenzi, Nicolò

doi:10.1016/j.ijpvp.2012.05.010

Cited by 29 publications

(19 citation statements)

References 22 publications

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“…The axial force can be produced, for example, by means of one or more bolts that must be accurately dimensioned [15][16][17][18][19]. The tooth is calculated against bending stress σ b (MPa), approximating the trapezoidal section at the base by a rectangular one, as reported in Equation (3), where z is the number of teeth:…”

Section: Standard Calculationmentioning

confidence: 99%

On Hirth Ring Couplings: Design Principles Including the Effect of Friction

et al. 2018

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Rings with Hirth couplings are primarily used for the accurate positioning of axial-symmetric components in the machine tool industry and, generally, in mechanical components. It is also possible to use Hirth rings as connection tools. Specific industries with special milling and grinding machines are able to manufacture both tailor made and standard Hirth rings available on stock. Unfortunately, no international standard (for instance ISO, DIN or AGMA) is available for the production and the design of such components. In the best-case scenario, it is possible to find simplified design formulae in the catalogue of the suppliers. The aim of this work is to provide some accurate formulae and computational methods for design to provide better awareness on the limitations and the potential of this type of connection. The work consists of five parts: (i) a review of the base calculation derived mainly from the catalogues of manufacturers; (ii) an improved calculation based on a new analytical method including the friction phenomenon; (iii) an experimentation run for validating the method; (iv) a case study applied to a machine tool; and, (v) a closed form formulation to determine an upper threshold for friction, thus ensuring the Hirth coupling regular performance.Abstract: Rings with Hirth couplings are primarily used for the accurate positioning of axialsymmetric components in the machine tool industry and, generally, in mechanical components. It is also possible to use Hirth rings as connection tools. Specific industries with special milling and grinding machines are able to manufacture both tailor made and standard Hirth rings available on stock. Unfortunately, no international standard (for instance ISO, DIN or AGMA) is available for the production and the design of such components. In the best-case scenario, it is possible to find simplified design formulae in the catalogue of the suppliers. The aim of this work is to provide some accurate formulae and computational methods for design to provide better awareness on the limitations and the potential of this type of connection. The work consists of five parts: (i) a review of the base calculation derived mainly from the catalogues of manufacturers; (ii) an improved calculation based on a new analytical method including the friction phenomenon; (iii) an experimentation run for validating the method; (iv) a case study applied to a machine tool; and, (v) a closed form formulation to determine an upper threshold for friction, thus ensuring the Hirth coupling regular performance.

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Section: Standard Calculationmentioning

confidence: 99%

On Hirth Ring Couplings: Design Principles Including the Effect of Friction

et al. 2018

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“…5). Thus, the preloads are applied off to one side of the curvic teeth, which are called 'prying loads' [11], due to bending effect, the stress variation from internal diameter to external diameter of the curvic teeth ring is formed. The transition structure between curvic teeth and disk also affects stress distribution of curvic teeth at radial direction.…”

Section: Finite Element Analysismentioning

confidence: 99%

Influence of Thin-Wall Structure on Stress Distribution of Curvic Couplings

Yuan¹,

Zhang²,

Zhu³

2015

Journal of Theoretical and Applied Mechanics

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Abstract. The objective of this paper is to investigate the influence of transition structure between curvic teeth and disk on stress distribution of curvic couplings, and provide data to help improving the design of curvic couplings. In this work, the three-dimensional finite element method was used, and Augmented Lagrange Algorithm was adopted to the contact algorithm during the analysis. According to the results of this paper, designing thin-wall structure reasonably can avoid detaching of contact interface at external diameter during preload process; reduce stress fluctuation of curvic teeth caused by circumferential bolts structure; and balance stress difference of each contact pair caused by different disk quality under the action of the centrifugal force.

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“…The full calculation of the stresses on both mounts is defined by (5). The maximum stresses generated by deflection in planeare given by (6) as follows:…”

Section: Stresses On Brake Caliper Mountsmentioning

confidence: 99%

“…Furthermore, the initial force generated by the screws is essential in order to lock the joint through friction and to avoid any dangerous failure. For this reason some specific tests have been performed in order to relate the torque moment and the initial force generated on these types of coupling [3][4][5]. In the previous papers, the importance of friction coefficient definition is pointed out because the friction value may strongly influence the stress field of components.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Stress State in Brake Caliper Mounts of Front Motorbike Suspensions

Croccolo

Agostinis

Olmi

et al. 2013

Advances in Mechanical Engineering

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The aim of this work is to analyze the stress and the strain fields in the brake caliper mounts of front motorbike suspensions produced by the braking action. First of all, some formulae useful to evaluate the maximum braking force in function of the vehicle features (e.g., total mass, centre of gravity position, tyre dimension, and brake disk diameter) have been developed. A mathematical model useful to calculate the axial, the bending, and the torque stresses on the braking caliper mounts has been then defined. The model has been developed by comparing the theoretical results with those obtained by some numerical analyses, based on the finite element method. An ad hoc test equipment has been, finally, designed and manufactured in order to define and analyze experimentally the strength of different types of brake caliper mounts and, at the same time, to verify the proposed model.

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A contribution to the selection and calculation of screws in high duty bolted joints

Cited by 29 publications

References 22 publications

On Hirth Ring Couplings: Design Principles Including the Effect of Friction

On Hirth Ring Couplings: Design Principles Including the Effect of Friction

Influence of Thin-Wall Structure on Stress Distribution of Curvic Couplings

Analysis of the Stress State in Brake Caliper Mounts of Front Motorbike Suspensions

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