A CAD model for the tolerancing of mechanical assemblies considering non-rigid joints between parts with defects

Korbi, Anis; Tlija, Mehdi; Louhichi, Borhen

doi:10.1177/09544054211025775

Cited by 10 publications

(2 citation statements)

References 25 publications

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“…Liu et al 9 optimized the assembly process of cylindrical multistage rotors by analyzing the mass eccentricity deviation. Korbi et al 10 utilized finite element method to obtain point clouds of deformed planar faces and cylindrical faces. Mu et al 11 researched the manufacturing error of mating end face of circular feature in rotor systems.…”

Section: Introductionmentioning

confidence: 99%

Flexible assembly research for cylindrical interference fit with form error in shaft-hole structures

Hai-dong

Xia

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part B:

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The interference fit has been widely used for torque transmission and assembly stability in the modern machinery industry. The form error of cylindrical feature is propagated during the interference fit of shaft-hole assembly, which causes the translation and rotation of following structures. Therefore, the overall precision variation is difficult to be predicted. In this paper, an error computational model of interference fit stage is proposed to represent the form error propagation of cylindrical features in the shaft-hole assembly. The characteristic parameter of form error is obtained by the minimum zone cylinder method and integrated into the small displacement torsor. The deformation behavior of interference fit with form error is described as a weakening propagation of error. An interference fit error propagation coefficient is introduced to quantify the phenomenon of weakening propagation of error, which depends on particular fit conditions such as materials, sizes, and interference range of parts. The error computational model for interference fit with form feature is deduced by using the Jacobian-Torsor theory. The characteristic of deformation flexibility in the interference fit is well considered comparing to the simple rigidity analysis in the traditional Jacobian-Torsor model. An error analysis of a shaft-hole structure deciding the symmetry and sensibility performance in the servo valve is conducted to verify the applicability. The cylindrical feature error and deformation during the interference fit are included. The results show that the new error model may represent characteristics of interference fit error propagation with form feature and has a higher reliability than the traditional error models.

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Section: Introductionmentioning

confidence: 99%

Flexible assembly research for cylindrical interference fit with form error in shaft-hole structures

Hai-dong

Xia

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part B:

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show abstract

“…Cao et al 20 obtained the relationship between tolerance and product function by analyzing the product function under different parts tolerance, and then constructed an effective 3D mathematical model of surface tolerance, using the Jacobian screw theory. Korbi et al 21 studied the relationship between input and output in the tolerance design of flexible bodies by adopting a statistical theory and numerical analysis method; accordingly, they proposed a tolerance analysis theory, considering the deformation of flexible bodies. Benichou and Anselmetti 22 took the non-rigid body as the object to carry out the tolerance analysis, which considered the thermal deformation and other factors in the assembly process.…”

Section: Introductionmentioning

confidence: 99%

Novel application of mapping method from small displacement torsor to tolerance: Error optimization design of assembly parts

Yuan

Wang

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part B:

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The manufacturing/assembly error of machine parts is a key factor that influences the performance and economy of mechanical systems. To achieve high assembly precision and performance on the basis of low manufacturing accuracy and cost, this study primarily optimizes the assembly error of machine parts. First, the small displacement torsor is used to characterize the small deformation between the mating surfaces of parts. Subsequently, to realize the combination of small displacement torsor and tolerance, the small displacement torsor with manufacturing error and assembly deformation is mapped to the tolerance domain. Second, based on the relationship between small displacement torsor and tolerance, an assembly error optimization model is established on the basis of the conventional tolerance-cost model, considering the emergence of manufacturing error and assembly deformation. Third, aiming at the high-pressure rotor for aeroengines, the error optimization design of assembly is carried out developed with the assembly accuracy requirement as the constraint condition, and the total costs of the manufacturing and assembly processes as the objective. The optimization results indicate that the manufacturing error range of each mating surface after optimization changes, from small to large, under the premise of ensuring the product’s performance, which verifies that the difficulty in processing parts is reduced, and that the efficiency of parts processing is also improved. Meanwhile, the relative manufacturing cost after optimization is reduced by 6.79%, which reflects the economic requirements to a certain extent. The content of this article provides the necessary design basis and reference for the realization of high assembly accuracy of mechanical systems, under low cost requirements from the design perspective.

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CAD-Based Methods for the Modeling of Planar Parts Assemblies with Flatness Defects

Korbi,

Gharbi,

Bahloul

et al. 2024

Lecture Notes in Mechanical Engineering

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A CAD model for the tolerancing of mechanical assemblies considering non-rigid joints between parts with defects

Cited by 10 publications

References 25 publications

Flexible assembly research for cylindrical interference fit with form error in shaft-hole structures

Flexible assembly research for cylindrical interference fit with form error in shaft-hole structures

Novel application of mapping method from small displacement torsor to tolerance: Error optimization design of assembly parts

CAD-Based Methods for the Modeling of Planar Parts Assemblies with Flatness Defects

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