CAD/tolerancing integration: a new approach for tolerance analysis of non-rigid parts assemblies

Korbi, Anis; Tlija, Mehdi; Louhichi, Borhen; Benamara, Abdelmajid

doi:10.1007/s00170-018-2347-5

Cited by 27 publications

(14 citation statements)

References 26 publications

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“…The interactions of form defects and surface deformations in CAT field have attracted more and more concerns but few research outcomes deal with cylindrical surface situations. 15,19–21 Here, the Conjugate Gradient-Fast Fourier Transform (CG-FFT) method is adopted to calculate the surface deformations. Under the assumption of frictionless non-adhesive contact, the contact of two non-ideal surfaces can be equivalently replaced by the contact of one-ideal surface and one non-ideal surface.…”

Section: Simulation Of Loose Fitmentioning

confidence: 99%

“…Speaking of the calculation of surface deformations, the most direct method was the Finite Element Method (FEM). Existed research outcomes such as Korbi et al 15 have considered the non-rigidity by using FEM. But the efficiency of FEM has limited its development in CAT filed, especially with a further consideration of interactions between form defects and surface deformations.…”

Section: Introductionmentioning

confidence: 99%

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Considerations of form defects and surface deformations for tolerance analysis of cylindrical components

Zhang

Liu

Pierre

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part B:

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The modeling and simulation of cylindrical surfaces with consideration of form defects have led to considerable research outcomes in the field of Computer-Aided Tolerancing (CAT). However, further consideration of surface deformations caused by external forces still remains a challenge. To address this issue, this paper properly considers the form defects and surface deformations for tolerance analysis of cylindrical components. First, form defects are considered by modeling skin model shapes of cylindrical surfaces. Afterwards, the tight fit and loose fit of a pair of cylindrical surfaces are identified, and the simulation methods of their positioning are presented. Specifically, for tight fit situation, a k-d tree based Iterative Closest Point (ICP) algorithm is used, and for loose fit situation, the constrained registration approach is adopted. Moreover, a Conjugate Gradient-Fast Fourier Transform (CG-FFT) method is presented for the consideration of surface deformations. In addition, simulations of given examples are conducted, which show the considerable effects of form defects and surface deformations. The simulations may also help determine the best performance of the to-be-assembled cylindrical components.

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Section: Simulation Of Loose Fitmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Considerations of form defects and surface deformations for tolerance analysis of cylindrical components

Zhang

Liu

Pierre

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part B:

View full text Add to dashboard Cite

show abstract

“…Additionally, the results of several studies supported the necessary to consider part deformations in the tolerance analysis stage, especially for compliant assembly. Korbi et al [34] considered the deformation of non-rigid parts and presented a model for tolerance analysis of nonrigid assemblies based on the finite element method and worst-case tolerancing. Corrado and Polini [35] integrated the non-nominal SMS with the mechanical properties to simulate a realistic assembly.…”

Section: Introductionmentioning

confidence: 99%

Precision Assembly Simulation of Skin Model Shapes Accounting for Contact Deformation and Geometric Deviations for Statistical Tolerance Analysis Method

Xiong

2021

Int. J. Precis. Eng. Manuf.

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Tolerance analysis methods, which are important to achieve a balance between manufacturing costs and functional requirements, have been studied and improved over the last 30 years. This paper proposes a new method to improve the precision of assembly simulation for statistical assembly simulation; by investigating the effect of the geometric deviations and mechanical behaviors of assembly contact on the stack-up assembly deviation by combining the recent theories on the tolerance analysis of rigid bodies and local contact deformation. To improve the precision of the tolerance analysis, real parts with form defects were simulated with the help of non-nominal skin model shapes. The SMSs were first considered to be rigid, and a quadratic optimization-based method for the rigid body displacement was used to calculate the initial contact points of all the SMSs. Next, contact deformation, following Hertzian contact theory, occurred at the initial contact points, which changed the relative positions of the SMSs in the subsequent interactions. The iteration process was convergent, and the final simulation for tolerance analysis could be generated after several iterations. Case studies demonstrated the practicality of the proposed method. Their actual assembly deviations were simulated by combining the effects of geometric deviations and local surface deformations. Since the proposed tolerance analysis framework based on statistical assembly simulation, it is expected to control the functional requirements of mechanical assemblies with much rough tolerance design and help optimize the tolerance in the future.

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“…Considering the impacts of dimensional and geometrical tolerances and part deformations on the functional requirement, Korbi et al. 21 proposed a tolerancing method of non-rigid parts assemblies to search for optimal tolerance values based on CAD/tolerancing integration. Andolfatto et al.…”

Section: Introductionmentioning

confidence: 99%

Concurrent design and process tolerances determination in consideration of geometrical tolerances

Peng

2019

Proceedings of the Institution of Mechanical Engineers, Part C:

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Concurrent design and process tolerances determination may ensure the manufacturability of products, improve the design efficiency, lower the overall production cost, reduce the quantity of unqualified products, and shorten product development cycle. Yet most of the current concurrent tolerancing models focus on the concurrent design of dimensional tolerances without taking into consideration geometrical tolerances. The objective of this study is to extend the concurrent tolerancing model to consider geometrical tolerance requirements. Firstly, the geometrical tolerances are either converted into equivalent dimensional tolerances or only treated as additional machining constraints based on their respective characteristics. Then, a concurrent tolerancing model is established based on ensuring the fulfillment of the product's functional requirements, taking the combination of expected quality loss and manufacturing cost as target function, and taking the functional constraints, geometrical tolerance constraints and process bound constraints as the constraint conditions. After having established the concurrent tolerancing model, the nonlinear programming technique is employed to solve this model to gain the optimal design and process tolerances. Finally, an example of wheel assembly is given to illustrate the validity of the suggested method.

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CAD/tolerancing integration: a new approach for tolerance analysis of non-rigid parts assemblies

Cited by 27 publications

References 26 publications

Considerations of form defects and surface deformations for tolerance analysis of cylindrical components

Considerations of form defects and surface deformations for tolerance analysis of cylindrical components

Precision Assembly Simulation of Skin Model Shapes Accounting for Contact Deformation and Geometric Deviations for Statistical Tolerance Analysis Method

Concurrent design and process tolerances determination in consideration of geometrical tolerances

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