1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN ISO 25178-2:2012Geometrical productspecifications (GPS) Surfacetexture: ArealPart 2: Terms, definitions and surfacetexture parameters (ISO 25178-2:2012)BS EN ISO 25178-2:20
2、12 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN ISO25178-2:2012.The UK participation in its preparation was entrusted to TechnicalCommittee TDW/4, Technical Product Realization.A list of organizations represented on this committee can beobtained on request to
3、 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 2012. Published by BSI StandardsLimited 2012ISBN 978 0 580 57496 2ICS 17.040.20Compliance with a British Standard
4、 cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 30 April 2012.Amendments issued since publicationDate Text affectedEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 25178-2 April 2012 ICS 17
5、.040.20 English Version Geometrical product specifications (GPS) - Surface texture: Areal - Part 2: Terms, definitions and surface texture parameters (ISO 25178-2:2012) Spcification gomtrique des produits (GPS) - Etat de surface: Surfacique - Partie 2: Termes, dfinitions et paramtres dtats de surfac
6、e (ISO 25178-2:2012) Geometrische Produktspezifikation (GPS) - Oberflchenbeschaffenheit: Flchenhaft - Teil 2: Begriffe und Oberflchen-Kenngren (ISO 25178-2:2012) This European Standard was approved by CEN on 17 September 2011. CEN members are bound to comply with the CEN/CENELEC Internal Regulations
7、 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 Management Centre or to any CEN member. Thi
8、s 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 status as the official versions. CEN memb
9、ers 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, Romania, Slovakia, Slovenia, Spain,
10、 Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2012 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN natio
11、nal Members. Ref. No. EN ISO 25178-2:2012: EBS EN ISO 25178-2:2012EN ISO 25178-2:2012 (E) 3 Foreword This document (EN ISO 25178-2:2012) has been prepared by Technical Committee ISO/TC 213 “Dimensional and geometrical product specifications and verification“ in collaboration with Technical Committee
12、 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 latest by October 2012, and confli
13、cting national standards shall be withdrawn at the latest by October 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 patent rights. According t
14、o 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, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, La
15、tvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Endorsement notice The text of ISO 25178-2:2012 has been approved by CEN as a EN ISO 25178-2:2012 without any modification. BS EN ISO 251
16、78-2:2012ISO 25178-2:2012(E) ISO 2012 All rights reserved iiiContents Page Foreword iv Introduction . v 1 Scope 1 2 Normative references 1 3 Terms and definitions . 1 3.1 General terms 1 3.2 Geometrical parameter terms 4 3.3 Geometrical feature terms 5 4 Field parameter definitions 8 4.1 Height para
17、meters . 8 4.2 Spatial parameters 9 4.3 Hybrid parameters . 11 4.4 Functions and related parameters . 11 4.5 Miscellaneous parameters . 21 5 Determination of areal parameters for stratified functional surfaces of scale-limited surfaces 22 5.1 Calculating the parameters Sk, Smr1 and Smr2 22 5.2 Calcu
18、lating the equivalent straight line 22 5.3 Calculating the parameters Spk and Svk 22 5.4 Calculating the parameters Spq, Svq and Smq . 22 6 Feature characterization . 24 6.1 General . 24 6.2 Type of texture feature 25 6.3 Segmentation . 25 6.4 Determining significant features . 25 6.5 Section of fea
19、ture attributes . 27 6.6 Attribute statistics . 28 6.7 Feature characterization convention . 28 6.8 Named feature parameters . 28 Annex A (informative) Segmentation 31 Annex B (informative) Fractal methods 36 Annex C (informative) Basis for areal surface texture standards 41 Annex D (informative) Co
20、ncept diagrams 42 Annex E (informative) Relation to the GPS matrix model . 45 Bibliography 46 BS EN ISO 25178-2:2012ISO 25178-2:2012(E) iv ISO 2012 All rights reservedForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member
21、bodies). The work of preparing 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
22、and non-governmental, in liaison 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 Directive
23、s, Part 2. The main task of 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 c
24、asting a vote. Attention is 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 25178-2 was prepared by Technical Committee ISO/TC 213, Dimensional and geometrica
25、l product specifications and verification. ISO 25178 consists of the following parts, under the general title Geometrical product specifications (GPS) Surface texture: Areal: Part 2: Terms, definitions and surface texture parameters Part 3: Specification operators Part 6: Classification of methods f
26、or measuring surface texture Part 70: Physical measurement standards Part 71: Software measurement standards Part 601: Nominal characteristics of contact (stylus) instruments Part 602: Nominal characteristics of non-contact (confocal chromatic probe) instruments Part 604: Nominal characteristics of
27、non-contact (coherence scanning interferometry) instruments Part 605: Nominal characteristics of non-contact (point autofocus probe) instruments Part 701: Calibration and measurement standards for contact (stylus) instruments The following parts are under preparation: Part 1: Indication of surface t
28、exture Part 603: Nominal characteristics of non-contact (phase-shifting interferometric microscopy) instruments BS EN ISO 25178-2:2012ISO 25178-2:2012(E) ISO 2012 All rights reserved vIntroduction This part of ISO 25178 is a geometrical product specification (GPS) standard and is to be regarded as a
29、 general GPS standard (see ISO/TR 14638). It influences chain link 2 of the chains of standards on areal surface texture. 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 of ISO/GPS given in ISO 8015 apply to
30、 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 of the relation of this standard to the GPS matrix model, see Annex E. This part of ISO 25178 develops the termi
31、nology, concepts and parameters for areal surface texture. BS EN ISO 25178-2:2012BS EN ISO 25178-2:2012INTERNATIONAL STANDARD ISO 25178-2:2012(E) ISO 2012 All rights reserved 1Geometrical product specifications (GPS) Surface texture: Areal Part 2: Terms, definitions and surface texture parameters 1
32、Scope This part of ISO 25178 specifies terms, definitions and parameters for the determination of surface texture by areal methods. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies.
33、For undated references, the latest edition of the referenced document (including any amendments) applies. ISO/TS 16610-1:2006, Geometrical product specifications (GPS) Filtration Part 1: Overview and basic concepts ISO 17450-1:2011, Geometrical product specifications (GPS) General concepts Part 1: M
34、odel for geometrical specification and verification ISO 25178-3:1), Geometrical product specifications (GPS) Surface texture: Areal Part 3: Specification operators 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 17450-1 and ISO/TS 16610-1, and the fo
35、llowing apply. 3.1 General terms 3.1.1 non-ideal surface model skin model model of the physical interface of the workpiece with its environment ISO 17450-1:2011, 3.2.2 1) To be published. BS EN ISO 25178-2:2012ISO 25178-2:2012(E) 2 ISO 2012 All rights reserved3.1.1.1 mechanical surface boundary of t
36、he erosion, by a spherical ball of radius r, of the locus of the centre of an ideal tactile sphere, also with radius r, rolled over the skin model of a workpiece ISO 14406:2010, 3.1.1 3.1.1.2 electromagnetic surface surface obtained by the electromagnetic interaction with the skin model of a workpie
37、ce ISO 14406:2010, 3.1.2 3.1.2 specification coordinate system system of coordinates in which surface texture parameters are specified NOTE If the nominal surface is a plane (or portion of a plane), it is common (practice) to use a rectangular coordinate system in which the axes form a right-handed
38、Cartesian set, the X-axis and the Y-axis also lying on the nominal surface, and the Z-axis being in an outward direction (from the material to the surrounding medium). This convention is adopted throughout the rest of this part of ISO 25178. 3.1.3 primary surface surface portion obtained when a surf
39、ace portion is represented as a specified primary mathematical model with specified nesting index ISO/TS 16610-1:2006, 3.3 NOTE In this part of ISO 25178, an S-filter is used to derive the primary surface. 3.1.3.1 primary extracted surface finite set of data points sampled from the primary surface I
40、SO 14406:2010, 3.7 3.1.4 surface filter filtration operator applied to a surface NOTE In practice, the filter operator will apply to a primary extracted surface. 3.1.4.1 S-filter surface filter which removes small scale lateral components from the surface resulting in the primary surface 3.1.4.2 L-f
41、ilter surface filter which removes large scale lateral components from the primary surface or S-F surface 3.1.4.3 F-operation operation which removes form from the primary surface NOTE 1 Some F-operations (such as association operations) have a very different action to that of filtration. Though the
42、ir action can limit the larger lateral scales of a surface this action is very fuzzy hence the fuzzy line for the action of the F-operation in Figure 1. NOTE 2 Many L-filters are sensitive to form and require an F-operation first as a prefilter before being applied. BS EN ISO 25178-2:2012ISO 25178-2
43、:2012(E) ISO 2012 All rights reserved 33.1.5 S-F surface surface derived from the primary surface by removing the form using an F-operation NOTE Figure 1 illustrates the relationship between the S-F surface and the S-filter and F-operation. 3.1.6 S-L surface surface derived from the S-F surface by r
44、emoving the large scale components using an L-filter NOTE Figure 1 illustrates the relationship between the S-L surface and the S-filter and L-filter. aSmall scale. bLarge scale. cScale axis. dF-operation. eS-filter. fL-filter. caedfSSS-FS-LLSLFbFFigure 1 Relationships between the S-filter, L-filter
45、, F-operation and S-F and S-L surfaces 3.1.7 scale-limited surface S-F surface or a S-L surface 3.1.8 reference surface surface associated to the scale-limited surface according to a criterion NOTE 1 The result is used as a reference surface for surface texture parameters. NOTE 2 Examples of referen
46、ce surfaces include plane, cylinder and sphere. 3.1.9 evaluation area portion of the scale-limited surface for specifying the area under evaluation NOTE See ISO 25178-3 for more information. BS EN ISO 25178-2:2012ISO 25178-2:2012(E) 4 ISO 2012 All rights reserved3.1.10 definition area portion of the
47、 evaluation area for defining the parameters characterizing the scale-limited surface 3.2 Geometrical parameter terms 3.2.1 field parameter parameter defined from all the points on a scale-limited surface NOTE Field parameters are defined in Clause 4. 3.2.2 feature parameter parameter defined from a
48、 subset of predefined topographic features from the scale-limited surface NOTE Feature parameters are defined in Clause 5. 3.2.3 V-parameter material volume or void volume field or feature parameter 3.2.4 S-parameter field or feature parameter that is not a V-parameter 3.2.5 height signed normal dis
49、tance from the reference surface to the scale-limited surface NOTE 1 The distance is defined normal to the reference surface. NOTE 2 The height is negative, if from the reference surface the point lies in the direction of the material. 3.2.6 ordinate value z(x,y) height of the scale-limited surface at position x,y NOTE The coordinate system is based on the reference surface. 3.2.7 local gradient vector ,zzx ygradient of the scale-limited surface at position x,y NOTE For specifi
