The Applicability of CAT tools in industry – boundaries and challenges in tolerance engineering practice observed in a medical device company

Sigurdarson, Nökkvi S.; Eifler, Tobias; Ebro, Martin

doi:10.1016/j.procir.2018.04.066

Cited by 6 publications

(6 citation statements)

References 8 publications

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“…With the introduction of the personal computer 30 years ago, the development of software tools for tolerance analysis increased in importance [27]. A large number of software tools [28][29][30] were developed [31][32][33][34], which have since established themselves in few companies worldwide [35,36]. Due to the variety of methods and tools developed, there was an increasing need to revise existing standards.…”

Section: What Led Us To Today?-a Brief Historical Review On Tolerance Engineeringmentioning

confidence: 99%

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Statistical Tolerance Analysis—A Survey on Awareness, Use and Need in German Industry

et al. 2021

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The importance of geometric deviations of components for the aesthetic and functional quality of products has been undisputed for decades. So, it is not surprising that not only have numerous researchers devoted themselves to this field, but also commercial software tools for the analysis and optimization of tolerance specifications (currently already fully integrated in 3D-CAD systems) have been available for around 30 years. However, it is even more surprising that the well-founded specification of tolerances and their analysis using a so-called statistical tolerance analysis are only established in a few companies. There is thus a contradiction between the proclaimed relevance of tolerances and their actual consideration in everyday business life. Thus, the question of the significance of geometric deviations and tolerances as well as the use of statistical tolerance analysis arises. Therefore, a survey among 102 German companies was carried out. The results are presented and discussed in this paper.

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Section: What Led Us To Today?-a Brief Historical Review On Tolerance Engineeringmentioning

confidence: 99%

“…The focus of [35] was on the application of tolerance analysis in the field of medical engineering. They discuss the use and challenges of using software tools for tolerance analysis (computer-aided tolerancing, or CAT) in a company.…”

Section: Surveys On Tolerance Engineeringmentioning

confidence: 99%

Statistical Tolerance Analysis—A Survey on Awareness, Use and Need in German Industry

et al. 2021

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“…In moving, multiple-state mechanical products (i.e., products where the engagement of interfaces, and thus of parts, continuously change during use, thus having multiple structural states (Andreasen, Hansen & Cash 2015) that are the specific configurations of interfaces between parts see definition later), it has been observed that it is difficult for the product development teams to create an overview of the behavior of the products. As a result, it is difficult for the design practitioners to identify the interfaces that are critical for the intended behavior and thus for the intended functions across the different structural states (Bjarklev, Mortensen & Ebro 2017;Sigurdarson, Eifler & Ebro 2018). There is simply a lack of a systematic and quantitative approach or tool for prioritizing the tolerance analysis tasks.…”

Section: Issuementioning

confidence: 99%

“…Available commercial CAT tools were reviewed by Prisco & Giorleo (2002) and later by Sigurdarson et al (2018). Both contributions describe that CAT systems in many cases are capable of doing advanced tolerance calculations.…”

Section: Modeling Variation In Mechanical Assembliesmentioning

confidence: 99%

“…The list of function-critical interfaces between parts that experience variation (i.e., key characteristics) at different structural states creates the basis for the tolerance analysis work done during the variation risk assessment stage of the VRM process (Thornton 2004;Bjarklev et al 2017;Sigurdarson et al 2018). The process of identifying, evaluating, and prioritizing the most critical interfaces for the tolerance analysis can be assigned to the preliminary analysis step in generic risk management, described in ISO 31030:2009 (International Organization for Standardization 2010, Section 5.3.5).…”

Section: Issuementioning

confidence: 99%

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Product behavior complexity metric for early prioritization of tolerance analysis tasks

et al. 2020

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In order to reduce the time spent on tolerance analysis, it is necessary to correctly identify and prioritize the key characteristics of the product. For multiple-state mechanisms, a systematic procedure for doing this is lacking. We present a new complexity metric for multiple-state mechanisms based on the product behavior, describing the impact of geometrical variation. The sequence of the structural state transitions is linked to the product composition, enabling a clear prioritization of variation-critical states and interfaces. The approach is applied on an industrial case and verified based on a comparison with the company-specified priority tolerance calculations.

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From tolerance allocation to tolerance-cost optimization: a comprehensive literature review

Hallmann¹,

Schleich²,

Wartzack³

2020

Int J Adv Manuf Technol

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It is widely acknowledged that the allocation of part tolerances is a highly responsible task due to the complex repercussions on both product quality and cost. As a consequence, since its beginnings in the 1960s, least-cost tolerance allocation using optimization techniques, i.e. tolerance-cost optimization, was continuously in focus of numerous research activities. Nowadays, increasing cost and quality pressure, availability of real manufacturing data driven by Industry 4.0 technologies, and rising computational power result in a continuously growing interest in tolerance-cost optimization in both research and industry. However, inconsistent terminology and the lack of a classification of the various relevant aspects is an obstacle for the application of tolerance-cost optimization approaches. There is no literature comprehensively and clearly summarizing the current state of the art and illustrating the relevant key aspects. Motivated to overcome this drawback, this article provides a comprehensive as well as detailed overview of the broad research field in tolerance-cost optimization for both beginners and experts. To facilitate the first steps for readers who are less familiar with the topic, the paper initially outlines the fundamentals of tolerance-cost optimization including its basic idea, elementary terminology and mathematical formulation. These fundamentals serve as a basis for a subsequent detailed discussion of the key elements with focus on the different characteristics concerning the optimization problem, tolerance-cost model, technical system model and the tolerance analysis model. These aspects are gathered and summarized in a structured mind map, which equips the reader with a comprehensive graphical overview of all the various facets and aspects of tolerance-cost optimization. Beside this, the paper gives a retrospect of the past fifty years of research in tolerance cost-optimization, considering 290 relevant publications. Based thereon, current issues and future research needs in tolerance-cost optimization were identified.

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The Applicability of CAT tools in industry – boundaries and challenges in tolerance engineering practice observed in a medical device company

Cited by 6 publications

References 8 publications

Statistical Tolerance Analysis—A Survey on Awareness, Use and Need in German Industry

Statistical Tolerance Analysis—A Survey on Awareness, Use and Need in German Industry

Product behavior complexity metric for early prioritization of tolerance analysis tasks

From tolerance allocation to tolerance-cost optimization: a comprehensive literature review

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