Methods for evaluation of systematic geometric deviations in machined parts and their relationships to process variables

Henke, Richard P.; Summerhays, Kim D.; Baldwin, Jon M.; Cassou, R.M.; Brown, C.W.

doi:10.1016/s0141-6359(99)00023-9

Cited by 91 publications

(58 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Several studies have been made using the influence of form variations in assemblies, especially in the case of plane surfaces [6].In our case we considered an assembly of two cylindrical parts with a perfect cylindrical surface [7,8,9,10,11]. The tolerances assigned to the part (1) are position tolerance (coaxiality of the shaft) and the form tolerance (cylindricity of the shaft).…”

Section: Tolerancing Using the Deviations And Clearance Domains Methodsmentioning

confidence: 99%

Influence of form deviations on the tolerance analysis

Chahbouni¹,

Boutahari²,

Amegouz³

2014

IJET

View full text Add to dashboard Cite

The objective of this paper is to present the influence of form deviations on the tolerance analysis of an assembly. For this we will study initially the tolerance analysis using the deviations and clearances domains method, a second time we will integrate the influence of form tolerances on the allowable deviation domain. To illustrate this analysis we used a classical assembly with position and form tolerances (coaxiality and cylindricity). Finally a comparative study between the two cases was illustrated.

show abstract

Section: Tolerancing Using the Deviations And Clearance Domains Methodsmentioning

confidence: 99%

Influence of form deviations on the tolerance analysis

Chahbouni¹,

Boutahari²,

Amegouz³

2014

IJET

View full text Add to dashboard Cite

show abstract

“…Moreover, in this class of modes, banana modes can be identified compared to those generated by Henke et al [28].…”

Section: Rippled Modesmentioning

confidence: 99%

“…The shape of the geometry can be thus be reconstructed by DFT inverse. Henke et al [28] also used the Tchebychef Fourier Series model to describe the forms of a cylinder and identify specific types of error shapes. A model of eigen-shapes derived from a Principal Component Analysis (PCA) was also proposed considering the information from measurements to simulate shapes [29].…”

Section: Geometrical Defects Modelingmentioning

confidence: 99%

Tolerance analysis — Form defects modeling and simulation by modal decomposition and optimization

Homri

Goka

Levasseur

et al. 2017

Computer-Aided Design

View full text Add to dashboard Cite

is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. Tolerance analysis aims on checking whether specified tolerances enable functional and assembly requirements. The tolerance analysis approaches discussed in literature are generally assumed without the consideration of parts' form defects. This paper presents a new model to consider the form defects in an assembly simulation. A Metric Modal Decomposition (MMD) method is henceforth, developed to model the form defects of various parts in a mechanism. The assemblies including form defects are further assessed using mathematical optimization. The optimization involves two models of surfaces: real model and difference surface-base method, and introduces the concept of signed distance. The optimization algorithms are then compared in terms of time consumption and accuracy. To illustrate the methods and their respective applications, a simplified over-constrained industrial mechanism in three dimensions is also used as a case study.

show abstract

“…[18][19][20] This classification is based on the experience that in many manufacturing processes, similar geometric deviations can be observed on every part, whereas some geometric deviations can be observed only on a few workpieces. The systematic deviations are deterministic, predictable and reproducible [18][19][20] and may be depending on the manufacturing process, for example, products of clamping errors or the machine behaviour. In contrast to that, random deviations arise from fluctuations of the production process such as tool wear, varying material properties or fluctuations in environmental parameters (temperature, humidity, etc.).…”

Section: Modelling Geometric Deviationsmentioning

confidence: 99%

How to determine the influence of geometric deviations on elastic deformations and the structural performance?

Schleich

Wartzack

2013

Proceedings of the Institution of Mechanical Engineers, Part B:

View full text Add to dashboard Cite

Geometric deviations are observable on every manufactured part since manufacturing processes are inherently imprecise and measuring processes always involve uncertainties. These geometric deviations have influences on the function and the quality of the product. Therefore, allowable limits for these geometric deviations, depicted as geometric tolerances, have to be set. They define the allowable geometric deviations of a part for which the product function is guaranteed. In this context, elastic deformations and the structural performance are key aspects. However, the manufacturing-caused geometric deviations have an influence on the elastic deformations during use and the structural performance of the parts. In other words, there are interdependencies between geometric deviations and elastic deformations which affect the dimensional accuracy of a loaded part in an assembly. Therefore, this article proposes an approach for determining the impact of geometric deviations on the structural performance. This approach employs techniques such as sensitivity analysis, analysis of robustness and evaluation of reliability, and aims at providing information about the expectable elastic deformations and structural performance to geometric tolerancing. It can be concluded that geometric deviations can have a big impact on the structural performance, and thus, not only parametric deviations but also geometric deviations regarding the form and shape of a part itself should be taken into account within the structural performance analysis and tolerance simulations. KeywordsStructural performance, computer-aided tolerancing, geometric deviations Date received: 11 July 2012; accepted: 1 November 2012 Structural performance evaluation in computer-aided tolerancing Since every manufacturing process is inherently imprecise and every measuring process involves uncertainties, geometric deviations are generally observable on every manufactured and measured part.1 These geometric imperfections can have huge influences on the function and the customer-perceived quality of the product. Hence, geometric dimensioning and tolerancing is an important step in the product development process since it is the step where the limits of allowable geometric deviations are defined. However, it is difficult to set these limits since geometric deviations influence the functional behaviour of the part in many ways. The structural performance, however, is a key aspect. Therefore, an approach is proposed that helps to determine the effects of geometric deviations on the structural performance.By connecting different methods of computer-aided design (CAD), computer-aided tolerancing and tools for computer-aided simulations such as the finiteelement (FE) method and assembly simulations, the product developer can be supported in setting the tolerance requirements. In this respect, the main goal is to draw a realistic virtual image of the geometry, function and behaviour of the real part or assembly group with geometric deviations during product dev...

show abstract

Methods for evaluation of systematic geometric deviations in machined parts and their relationships to process variables

Cited by 91 publications

References 13 publications

Influence of form deviations on the tolerance analysis

Influence of form deviations on the tolerance analysis

Tolerance analysis — Form defects modeling and simulation by modal decomposition and optimization

How to determine the influence of geometric deviations on elastic deformations and the structural performance?

Contact Info

Product

Resources

About