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Complementary Writing of Maximum and Least Material Requirements, with an Extension to Complex Surfaces
- Source :
- 14th CIRP CAT 2016-CIRP Conference on Computer Aided Tolerancing, 14th CIRP CAT 2016-CIRP Conference on Computer Aided Tolerancing, CHALMERS UNIVERSITY OF TECHNOLOGY, May 2016, Gothenburg, Sweden. pp.220-225, ⟨10.1016/j.procir.2016.02.153⟩
- Publication Year :
- 2016
- Publisher :
- HAL CCSD, 2016.
-
Abstract
- International audience; Maximum and least material requirements describe the strictly necessary fittability and accuracy functional requirements for an assembly involving connections with clearances. In the ISO 2692:2014 [1] dimensioning and tolerancing standard, the writing of this requirement violates the principle of independency and is limited to features of size. This paper proposes two complementary writings and several explanations for the application of the concepts. In order to make the definitions consistent with those of ISO 1101:2012 [2] standard, the requirements are defined by means of unilateral tolerance zones. For features of size, the dimension of the tolerance zone for the specified surface and for the reference is written directly between brackets in the specification. For all complex surfaces, the tolerance zone is defined by an offset surface of the nominal surface. The offset value is written between braces. The definitions of form, location and orientation specifications with these modifiers are given for simple elements and for a pattern of holes. Composite specifications, which associate orientation and location tolerance zones with respect to the same nominal, are defined. An example with flutter on a primary reference shows that it is no longer possible to use all the degrees of freedom to associate the subsequent references. The use of an orientation plane to deal with unidirectional chains of dimensions is defined. In terms of metrology, the characteristic to evaluate is the margin between the actual surface and the limit surface of the tolerance zone when the tolerance zone on the references is respected. This margin enables one, for example, to determine a capability. Three applications present an assembly of a mechanism with clearances, a connection with a complex surface and a 3D chain of dimensions at least material which requires a composite specification.
- Subjects :
- 0209 industrial biotechnology
Engineering
Offset (computer science)
business.industry
functional tolerancing
[PHYS.MECA.GEME]Physics [physics]/Mechanics [physics]/Mechanical engineering [physics.class-ph]
020207 software engineering
Functional requirement
02 engineering and technology
Material requirements
Position tolerance
ISO Standard
Metrology
020901 industrial engineering & automation
maximum/least material condition
0202 electrical engineering, electronic engineering, information engineering
General Earth and Planetary Sciences
Flutter
business
Algorithm
Dimensioning
composite specification
General Environmental Science
Functional tolerancing
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Journal :
- 14th CIRP CAT 2016-CIRP Conference on Computer Aided Tolerancing, 14th CIRP CAT 2016-CIRP Conference on Computer Aided Tolerancing, CHALMERS UNIVERSITY OF TECHNOLOGY, May 2016, Gothenburg, Sweden. pp.220-225, ⟨10.1016/j.procir.2016.02.153⟩
- Accession number :
- edsair.doi.dedup.....5b513ddb4c4952a5fb501ec4e74d0ee4