1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN ISO 17450-1:2011Geometrical productspecifications (GPS) GeneralconceptsPart 1: Model for geometrical specificationand verification (ISO 17450-1:2011)BS EN ISO 17450-1:2011
2、BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN ISO17450-1:2011. It supersedes DDCENISO/TS17450-1:2007 which iswithdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee TDW/4, Technical Product Realization.A list of organizations repr
3、esented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2012ISBN 978 0 580 66730 5ICS 17.040.01Compliance with a Br
4、itish Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 January 2012.Amendments issued since publicationDate Text affectedEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 17450-1 D
5、ecember 2011 ICS 17.040.01 Supersedes CEN ISO/TS 17450-1:2007English Version Geometrical product specifications (GPS) - General concepts - Part 1: Model for geometrical specification and verification (ISO 17450-1:2011) Spcification gomtrique des produits (GPS) - Concepts gnraux - Partie 1: Modle pou
6、r la spcification et la vrification gomtriques (ISO 17450-1:2011) Geometrische Produktspezifikation (GPS) - Grundlagen - Teil 1: Modell fr die geometrische Spezifikation und Prfung (ISO 17450-1:2011) This European Standard was approved by CEN on 10 December 2011. CEN members are bound to comply with
7、 the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Manage
8、ment Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same stat
9、us as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal
10、, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2011 CEN All rights of exploitation in any form and by any means res
11、erved worldwide for CEN national Members. Ref. No. EN ISO 17450-1:2011: EBS EN ISO 17450-1:2011EN ISO 17450-1:2011 (E) 3 Foreword This document (EN ISO 17450-1:2011) has been prepared by Technical Committee ISO/TC 213 “Dimensional and geometrical product specifications and verification“ in collabora
12、tion with Technical Committee CEN/TC 290 “Dimensional and geometrical product specification and verification” the secretariat of which is held by AFNOR. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the lates
13、t by June 2012, and conflicting national standards shall be withdrawn at the latest by June 2012. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such pat
14、ent rights. This document supersedes CEN ISO/TS 17450-1:2007. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estoni
15、a, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of ISO 17450-1:2011 has been approved by CEN
16、 as a EN ISO 17450-1:2011 without any modification. BS EN ISO 17450-1:2011ISO 17450-1:2011(E) ISO 2011 All rights reserved iiiContents Page Foreword iv Introduction . v 1 Scope 1 2 Normative references 1 3 Terms and definitions . 1 4 Application and future prospects 11 5 General . 11 6 Features 12 6
17、.1 General . 12 6.2 Ideal features . 13 6.3 Non-ideal features . 15 6.4 Relationships between geometrical feature terms 16 7 Characteristics . 18 7.1 General . 18 7.2 Intrinsic characteristics of ideal features . 18 7.3 Situation characteristics between ideal features . 19 7.4 Situation characterist
18、ics between non-ideal and ideal features 20 8 Operations 21 8.1 Feature operations 21 8.2 Evaluation 25 8.3 Transformation 26 9 Specification 26 9.1 General . 26 9.2 Specification by dimension 26 9.3 Specification by zone 27 9.4 Deviation 27 10 Verification . 28 Annex A (informative) Examples of app
19、lications to ISO 1101 29 Annex B (informative) Mathematical symbols and definitions . 43 Annex C (informative) Comparison between tolerancing and metrology . 55 Annex D (informative) Concept diagram for characteristics 57 Annex E (informative) Invariance classes 58 Annex F (informative) Relationship
20、 to the GPS matrix model 60 Bibliography 62 Alphabetical index 63 BS EN ISO 17450-1:2011ISO 17450-1:2011(E) iv ISO 2011 All rights reservedForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of prepari
21、ng International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in lia
22、ison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of
23、technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is
24、drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 17450-1 was prepared by Technical Committee ISO/TC 213, Dimensional and geometrical product specifications and
25、 verification. This first edition of ISO 17450-1 cancels and replaces ISO/TS 17450-1:2005, which has been technically revised. It also incorporates the Technical Corrigendum ISO/TS 17450-1:2005/Cor.1:2007. ISO 17450 consists of the following parts, under the general title Geometrical product specifi
26、cations (GPS) General concepts: Part 1: Model for geometrical specification and verification Part 2: Basic tenets, specifications, operators, uncertainties and ambiguities BS EN ISO 17450-1:2011ISO 17450-1:2011(E) ISO 2011 All rights reserved vIntroduction This part of ISO 17450 is a geometrical pro
27、duct specification (GPS) document and is to be regarded as a global GPS document (see ISO/TR 14638). It influences all chain links of the chains of standards. The ISO/GPS Masterplan given in ISO/TR 14638 gives an overview of the ISO/GPS system of which this document is a part. The fundamental rules
28、of ISO/GPS given in ISO 8015 apply to this document and the default decision rules given in ISO 14253-1 apply to specifications made in accordance with this document, unless otherwise indicated. For more detailed information on the relationship of this part of ISO 17450 to other standards and to the
29、 GPS matrix model, see Annex F. In a market environment of increased globalization, the exchange of technical product information is of high importance and the need to express unambiguously the geometry of mechanical workpieces of vital urgency. Consequently, codification associated with the macro-
30、and micro-geometry of workpiece specifications needs to be unambiguous and complete if the functional geometrical variation of parts is to be limited; in addition, the language ought to be applicable to CAx systems. The aim of ISO/TC 213 is to provide the tools for a global and “top-down” approach t
31、o GPS. These tools form the basis of new standards specifying a common language for geometrical definition. This language can be used by design (assemblies and individual workpieces), manufacturing and inspection, to describe the measurement procedure, regardless of the media (e.g. a paper drawing,
32、numerical drawing or exchange file) used. The tools are based on the characteristics of features, as well as on the constraints between the features and on feature operations, used for the creation of different geometrical features. BS EN ISO 17450-1:2011BS EN ISO 17450-1:2011INTERNATIONAL STANDARD
33、ISO 17450-1:2011(E) ISO 2011 All rights reserved 1Geometrical product specifications (GPS) General concepts Part 1: Model for geometrical specification and verification 1 Scope This part of ISO 17450 provides a model for geometrical specification and verification and defines the corresponding concep
34、ts. It also explains the mathematical basis of the concepts associated with the model and defines general terms for geometrical features of workpieces. This part of ISO 17450 defines the fundamental concepts for the GPS system in order to: provide nonambiguous GPS language to be used in design, manu
35、facturing and verification, identify features, characteristics and rules to provide the basis for specifications, provide a complete symbology language to indicate GPS specifications, provide simplified symbology by defining default rules, and provide consistent rules for verification. 2 Normative r
36、eferences The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO/IEC Guide 99, International vocabul
37、ary of metrology Basic and general concepts and associated terms (VIM) 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO/IEC Guide 99 and the following apply. 3.1 real surface of a workpiece set of features which physically exist and separate the entir
38、e workpiece from the surrounding medium BS EN ISO 17450-1:2011ISO 17450-1:2011(E) 2 ISO 2011 All rights reserved3.2 surface model model representing the set of physical limits of the virtual or the real workpiece NOTE 1 This model applies to all closed surfaces. NOTE 2 The surface model allows the d
39、efinition of single features, sets of features, and/or portions of features. The total product is modelled by a set of surface models corresponding to each workpiece. 3.2.1 nominal model of a workpiece model of the perfect shape defined by the designer NOTE The nominal model represents the design in
40、tent. 3.2.2 non-ideal surface model skin model of a workpiece model of the physical interface of the workpiece with its environment NOTE See Clause 5. 3.3 geometrical feature point, line, surface, volume or a set of these items NOTE 1 The non-ideal surface model is a particular type of geometrical f
41、eature, corresponding to the infinite set of points defining the interface between the workpiece and its surroundings. NOTE 2 A geometrical feature can be an ideal feature or a non-ideal feature, and can be considered as either a single feature or a compound feature. 3.3.1 ideal feature feature defi
42、ned by a parametrized equation NOTE 1 The expression of the parametrized equation depends on the type of ideal feature and on its intrinsic characteristics. NOTE 2 By default, an ideal feature is infinite. To change its nature, it is appropriate to specify this by adding the term “restricted” as in
43、“restricted ideal feature”. 3.3.1.1 attribute of an ideal feature property intrinsically attached to an ideal element NOTE 1 Four levels of attributes can be defined for an ideal feature: 1) shape; 2) dimensional parameters from which a size can be defined in the case of dimensional feature; 3) situ
44、ation feature; and 4) skeleton (when the size is set equal to zero). NOTE 2 If the ideal feature is a feature of size, then one of parameters of the shape can be considered as a size. 3.3.1.1.1 dimensional parameter linear or angular dimension of an ideal feature used in the expression of its parame
45、trized equation NOTE A dimensional parameter can correspond to a size of a feature of size. 3.3.1.1.2 skeleton feature geometrical feature resulting from the reduction of a feature of size when its size is set equal to zero BS EN ISO 17450-1:2011ISO 17450-1:2011(E) ISO 2011 All rights reserved 3NOTE
46、 1 In the nominal model, the skeleton feature is a geometrical attribute of a nominal integral feature. A nominal integral feature and its skeleton belong to the same invariance class and have the same situation feature. NOTE 2 In the non-ideal feature, several possible skeleton features exist for t
47、he same integral feature. EXAMPLE In case of a torus, there are two dimensional parameters, one of which is a size (the small diameter of the torus). Its skeleton is a circle; its situation features are a plane (containing the circle) and a point (centre of the circle). 3.3.1.1.3 situation feature p
48、oint, straight line, plane or helix, from which the location and/or orientation of a geometrical feature can be defined See Figures 1 to 4. NOTE 1 A situation feature is a geometrical attribute of an ideal feature. NOTE 2 No dimensional parameters are linked to a situation feature. NOTE 3 In many ca
49、ses, instead of using the situation helix, the axis of a situation helix is used. EXAMPLE In the case of a torus, there are two dimensional parameters, one of which is a size (the small diameter of the torus). Its skeleton is a circle and its situation features are a plane (containing the circle) and a point (centre of the circle). a) Situation point for a sphere b) Situation point for a cone Figure 1 Example of situation points a) Situation straight line for a cylinder b) Situation straight line for a cone Figu
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