Wyniki wyszukiwania - BazTech

1

GPS application in the design of gearboxes

Maláková Silvia, Sivák Samuel

Acta Mechanica et Automatica

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2022

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Vol. 16, no. 4

309--315

EN

The integrated geometrical product specification (GPS) system for workpiece geometry specification and verification is an improved engineering tool for product development and production. The goal of the GPS system is to provide tools for cost-effective management of variability in products and processes. This can be achieved by using a more precise way of expressing the functional requirements of the workpiece, complete and well-defined specifications and integrated verification approaches. The intended function of the product is ensured by controlling the geometry and material properties of the workpiece parts, which make up the product. GPS is a language just for checking geometry, and further development is based on computational mathematics and correct, consistent logic using general sets of rules that can be applied to all types of specifications. This article deals with the application of GPS rules in the design of gearboxes.

2

Language of geometrical product specifications – a mysterious and unknown whether second native language of each engineer?

Humienny Zbigniew

Mechanik

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2020

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R. 93, nr 7

18--23

EN

The role of geometrical tolerances in ensuring compliance with the functional requirements defined for a product is shown. Directions of development of graphical geometrical product specification language, which is an important element of the ISO GPS system, are presented. The indicators given in the drawing of the disc with cylindrical and cuboid holes are analysed, and the need to use of modifiers is justified. Alternative modifiers are shown. It is explained when the position tolerance specifications should be considered separately, as combined or simultaneously.

PL

Wyjaśniono rolę tolerancji geometrycznych w zapewnieniu spełnienia wymagań funkcjonalnych określonych dla wyrobu. Przedstawiono kierunki rozwoju graficznego języka specyfikacji geometrii wyrobów, będącego istotnym elementem systemu ISO GPS. Przeanalizowano oznaczenia użyte na rysunku tarczy z otworami walcowymi i prostopadłościennymi oraz uzasadniono potrzebę zastosowania modyfikatorów. Pokazano alternatywne modyfikatory. Wyjaśniano, kiedy specyfikacje tolerancji pozycji należy rozpatrywać niezależnie, łącznie albo równocześnie.

3

Complementing and enhancing definitions of line profile composite tolerance imposed by ISO geometrical product specification

Yan Y., Bohn M.

Journal of Machine Engineering

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2018

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Vol. 18, No. 2

74--84

EN

According to the ISO Geometrical Product Specifications (GPS), if two or more specifications of the same characteristic are to be indicated, they may be combined as a composite tolerance. Therefore there are no definition differences between the single separate tolerance indicators and their composite tolerance, which is different from the ASME standards. Hereby, the definitions of the combined tolerance which specifies the additional location, orientation and form of tolerance zone are not explicitly defined in the current ISO. It restricts the required definitions of tolerance specifications of a component which are often utilized in practice. However, the required definitions cannot be notated in the technical drawings by using the ISO semantics, because the ISO definitions are insufficient. It causes definition gaps and misinterpretations. This paper focuses on developing the definitions of line profile composite tolerance and suggests a new approach for explicitly defined and function-oriented systematology of line profile composite tolerance. This research is based on the analysis of physical behaviour of geometric feature of a component on a theoretical level. Completed and enhanced definitions in an improved systematology for line profile composite tolerance is formulated which fills the definition gaps and eliminates the deficits in ISO GPS.

4

Limitations of notation system in centred part alignment accuracy imposed by ISO standard and proposal for an improved methodology

Yan Y., Bohn M.

Journal of Machine Engineering

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2017

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Vol. 17, No. 2

90--101

EN

According to the ISO Geometrical Product Specifications (GPS), centred part alignment with one centred point can be described clearly using technical drawings. There are two main limitations of this standard; Firstly: the uncertainty over use of notations in technical drawings when more than one centred point is applied, and secondly, the use of fixed datum targets to centred points which causes an unstable alignment process. This article suggests a new approach for a functional, explicitly defined notation system of datums and datum systems based on the research of orientation constraints between datums. This new approach simplifies the technical drawing, thereby eliminating notation uncertainties. An improved methodology for a stable alignment process was developed based on physical analysis of the centred part alignment which implements movable datum targets.