A Case Study on the Correlation Between Functional and Manufacturing Specifications for a Large Injection Moulded Part

Maltauro, Mattia; Meneghello, Roberto; Concheri, Gianmaria; Pellegrini, Daniele; Viero, Massimo; Bisognin, Giuseppe

doi:10.1007/978-3-031-15928-2_111

Cited by 4 publications

(2 citation statements)

References 12 publications

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“…Recently, a formal procedure to correlate the "manufacturing specification" to the "functional specification" for deformable components was proposed. In this framework, the "manufacturing specification" refers to the "as manufactured" state, therefore, the "free state" while the "functional specification" refers to the "as assembled" state, in which the part can be consider rigid [46,47].…”

Section: Manufacturing Geometric Specificationmentioning

confidence: 99%

“…The functional and manufacturing specifications should then be related by tolerance stack-ups, where the functional tolerances are the critical dimension limits, and the manufacturing tolerances are process-dependent variables. If parts are non-rigid, meaning that they will reach a stable configuration only once assembled, the correlation shall take into consideration deformability [46,47]. If more manufacturing steps are required, this transfer will be created between the functional specification and the manufacturing specification relevant to the last manufacturing step.…”

Section: Horizontal Hierarchy-spacer Platementioning

confidence: 99%

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Tolerance Specifications Management Integrated into the Product Development Cycle

Maltauro,

Meneghello,

Concheri

2024

Machines

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In tolerancing activities focusing on the allocation of geometrical tolerances, many critical issues originate from the non-optimal assignment of responsibilities among the organization units involved. This paper aims to depict relations between different tolerancing activities and relevant specifications, assigning them to the proper actor and, therefore, expanding the ISO 8015:2011 “responsibility principle”. A classification among tolerancing activities, specifications, and media is proposed; a horizontal hierarchical framework among functional, manufacturing, and verification specifications and a vertical hierarchical framework along the supply chain are discussed. Examples of both hierarchical structures are presented.

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Section: Manufacturing Geometric Specificationmentioning

confidence: 99%

Section: Horizontal Hierarchy-spacer Platementioning

confidence: 99%

Tolerance Specifications Management Integrated into the Product Development Cycle

Maltauro,

Meneghello,

Concheri

2024

Machines

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Bridging the gap between design and manufacturing specifications for non-rigid parts using the influence coefficient method

Maltauro,

Passarotto,

Concheri

et al. 2023

Int J Adv Manuf Technol

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The manufacturing process may lead non-rigid parts to endure large deformations which could be reduced during assembly. The manufacturing specifications of the single parts should refer to their free state or “as manufactured” state; the functional specifications should instead address the “as assembled” state. Therefore, a functional geometrical inspection requires dedicated fixtures to bring the parts in “as assembled” state. In this paper, through a linearized model that considers fixturing and elastic spring-back, we aim to correlate the functional specification to the manufacturing specifications. The model suggests a hybrid approach called “restricted skin model” that allows to reduce the degrees of freedom considering the form error when relevant. Firstly, the framework is verified in a mono-dimensional test case. Subsequently, it is verified including FEM simulation and actual measurement for two simple assemblies. The results show that the model can correctly interpret the theoretical assembly behaviour for actual applications. The use of the “restricted skin model” approach shows a negligible difference when compared to full FEM simulation with differences of 2.1 · 10−7 mm for traslations and 6.0 · 10−3 deg for rotations. The comparison with actual measurement values showed an error of ±0.2 mm at the assembly features. Furthermore, the linearized model allows a possible real-time application during production that enables to adjust manufacturing specification limits in case of process drifting.

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A second-order tolerance analysis approach to statistical virtual assembly for rigid parts

Maltauro,

Meneghello,

Concheri

2024

Int J Adv Manuf Technol

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Virtual assembly has become a popular trend in recent years and is used for various purposes, including selective assembly and adaptive tooling. Monte Carlo approaches based on Finite Element Method (FEM) simulations are commonly used for production applications. However, during the design phase, when testing different configurations and design options, a variational method is more suitable. This paper aims to test different implementations of the Method of System Moments applied to the second-order tolerance analysis method when actual distributions, which are non-centered and non-normal, are used as input for the simulation. The study reveals that the simulation results can significantly vary depending on the simulation settings in some cases. As a result, a series of best practices are highlighted to improve the accuracy and reliability of the simulation outcomes.

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A Case Study on the Correlation Between Functional and Manufacturing Specifications for a Large Injection Moulded Part

Cited by 4 publications

References 12 publications

Tolerance Specifications Management Integrated into the Product Development Cycle

Tolerance Specifications Management Integrated into the Product Development Cycle

Bridging the gap between design and manufacturing specifications for non-rigid parts using the influence coefficient method

A second-order tolerance analysis approach to statistical virtual assembly for rigid parts

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