1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN ISO 12780-1:2011Geometrical pr o d u c t specifications (GPS) StraightnessPart 1: Vocabulary and parameters of straightnessBS EN ISO 12780-1:2011 BRITISH STANDARDNational f
2、orewordThis British Standard is the UK implementation of EN ISO 12780-1:2011. It supersedes DD CEN ISO/TS 12780-1:2007, which is withdrawn.The UK participation in its preparation was entrusted to T e c h n i c a l C o m m i t t e e T D W / 4 , T e c h n i c a l P r o d u c t R e a l i z a t i o n .A
3、 list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. BSI 2011 ISBN 978 0 580 66724 4 ICS 01.040.17; 17.040.20 Compli
4、ance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 April 2011.Amendments issued since publicationDate T e x t a f f e c t e dEUROPEAN STANDARD NORME EUROPENNE EUROPISC
5、HE NORM EN ISO 12780-1 April 2011 ICS 01.040.17; 17.040.20 Supersedes CEN ISO/TS 12780-1:2007English Version Geometrical product specifications (GPS) - Straightness - Part 1: Vocabulary and parameters of straightness (ISO 12780-1:2011) Spcification gomtrique des produits (GPS) - Rectitude -Partie 1:
6、 Vocabulaire et paramtres de rectitude (ISO 12780-1:2011) Geometrische Produktspezifikation (GPS) - Geradheit - Teil 1: Begriffe und Kenngren der Geradheit (ISO 12780-1:2011) This European Standard was approved by CEN on 17 March 2011. CEN members are bound to comply with the CEN/CENELEC Internal Re
7、gulations 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 me
8、mber. 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 status as the official versions.
9、 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, Romania, Slovakia, Sloveni
10、a, 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 reserved worldwide for CEN nati
11、onal Members. Ref. No. EN ISO 12780-1:2011: EBS EN ISO 12780-1:2011 EN ISO 12780-1:2011 (E) 3 Foreword This document (EN ISO 12780-1:2011) has been prepared by Technical Committee ISO/TC 213 “Dimensional and geometrical product specifications and verification“ in collaboration with Technical Committ
12、ee 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 2011, and conf
13、licting national standards shall be withdrawn at the latest by October 2011. 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. This docu
14、ment supersedes CEN ISO/TS 12780-1:2007. 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, Estonia, Finland, France, G
15、ermany, 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 12780-1:2011 has been approved by CEN as a EN ISO 12780-1:
16、2011 without any modification. BS EN ISO 12780-1:2011ISO 12780-1:2011(E) ISO 2011 All rights reserved iiiContents Page Foreword iv Introduction.v 1 Scope1 2 Normative references1 3 Terms and definitions .1 3.1 General terms 1 3.2 Terms relating to profiles .2 3.3 Terms relating to the reference line
17、 3 3.4 Terms relating to the filter function.4 3.5 Terms relating to parameters.5 Annex A (informative) Mathematical definition of straightness tolerances of nominal integral features.6 Annex B (informative) Synoptic tables of terms, abbreviated terms and parameters.7 Annex C (informative) Relations
18、hip to the GPS matrix model .9 Bibliography11 BS EN ISO 12780-1:2011ISO 12780-1:2011(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 preparing International Sta
19、ndards 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 liaison with ISO, also
20、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 technical committees
21、 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 drawn to the possibi
22、lity 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 12780-1 was prepared by Technical Committee ISO/TC 213, Dimensional and geometrical product specifications and verification. This
23、first edition of ISO 12780-1 cancels and replaces ISO/TS 12780-1:2003, which has been technically revised. ISO 12780 consists of the following parts, under the general title Geometrical product specifications (GPS) Straightness: Part 1: Vocabulary and parameters of straightness Part 2: Specification
24、 operators BS EN ISO 12780-1:2011ISO 12780-1:2011(E) ISO 2011 All rights reserved vIntroduction This part of ISO 12780 is a geometrical product specification (GPS) standard and is to be regarded as a general GPS standard (see ISO/TR 14638). It influences chain link 2 of the chain of standards on for
25、m of line independent of datum. 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 this document and the default decision rules given in ISO 14253-1 apply to specifications
26、 made in accordance with this document, unless otherwise indicated. For more detailed information of the relationship of this part of ISO 12780 to other standards and the GPS matrix model, see Annex C. This part of ISO 12780 defines terms and concepts necessary for defining the specification operato
27、rs according to ISO 17450-2 for straightness of integral features. Extracting data always involves applying a certain filtering process. An additional filtering of the extracted data might or might not be applied. This additional filter can be a mean line filter (Gaussian, spline, wavelet, etc.) or
28、a non-linear filter (e.g. morphological filter). The type of filtering influences the definition of straightness and the specification operators and, therefore, needs to be stated unambiguously. This part of ISO 12780 is not intended to disallow any means of measuring straightness. BS EN ISO 12780-1
29、:2011BS EN ISO 12780-1:2011INTERNATIONAL STANDARD ISO 12780-1:2011(E) ISO 2011 All rights reserved 1Geometrical product specifications (GPS) Straightness Part 1: Vocabulary and parameters of straightness 1 Scope This part of ISO 12780 defines the terms and concepts related to straightness of individ
30、ual integral features and covers complete straightness profiles only. NOTE Straightness of an extracted derived axis of a cylinder is defined in ISO 12180-1 and ISO 12180-2. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated re
31、ferences, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 11562:1996, Geometrical Product Specifications (GPS) Surface texture: Profile method Metrological characterization of phase correct filters ISO 1278
32、0-2:2011, Geometrical product specifications (GPS) Straightness Part 2: Specification operators ISO 14660-1:1999, Geometrical Product Specifications (GPS) Geometrical features Part 1: General terms and definitions ISO 14660-2:1999, Geometrical Product Specifications (GPS) Geometrical features Part 2
33、: Extracted median line of a cylinder and a cone, extracted median surface, local size of an extracted feature ISO 17450-1:1), Geometrical product specifications (GPS) General concepts Part 1: Model for geometrical specification and verification 3 Terms and definitions For the purposes of this docum
34、ent, the terms and definitions given in ISO 14660-1, ISO 14660-2 and ISO 17450-1 and the following apply. 3.1 General terms 3.1.1 straightness property of a straight line 1) To be published. (Revision of ISO/TS 17450-1:2005) BS EN ISO 12780-1:2011ISO 12780-1:2011(E) 2 ISO 2011 All rights reserved3.1
35、.2 normal of the surface normal of a feature associated with an integral feature 3.1.3 straightness plane plane for which the intersection with the associated integral feature is a straight line See Figure 1. NOTE By default, the straightness plane includes the normal of the surface 3.2 Terms relati
36、ng to profiles 3.2.1 extracted line straightness digital representation of the intersection of the real surface and the straightness plane See Figure 1. NOTE The extraction conventions for straightness are given in ISO 12780-2. This extracted line is an extracted integral feature as defined in ISO 1
37、4660-1. Key A-A straightness plane 1 extracted line Figure 1 Straightness plane and extracted line 3.2.2 straightness profile extracted line intentionally modified by a filter NOTE This is the profile to which the concepts and parameters of this part of ISO 12780 can be applied. 3.2.3 local straight
38、ness deviation Sldeviation of a point on a straightness profile from the reference line, the deviation being normal to the reference line See Figure 2. NOTE 1 The deviation is negative if from the reference line the point lies in the direction of the material. NOTE 2 For reference line, see 3.3.1. B
39、S EN ISO 12780-1:2011ISO 12780-1:2011(E) ISO 2011 All rights reserved 3Key 1 reference line aPositive local straightness deviation. bNegative local straightness deviation. Figure 2 Local straightness deviation 3.3 Terms relating to the reference line 3.3.1 reference line associated line fitting the
40、straightness profile in accordance with specified conventions, to which the deviations from straightness and the straightness parameters are referred 3.3.1.1 minimum zone reference lines two parallel lines in the straightness plane enclosing the straightness profile and having the least separation S
41、ee Figure 3. NOTE The symbol MZ is used to refer to minimum zone reference elements. Key 1 outer minimum zone reference line 2 mean minimum zone reference line 3 inner minimum zone reference line aLeast separation. Figure 3 Minimum zone reference lines 3.3.1.1.1 outer minimum zone reference line min
42、imum zone reference line outside the material See Figure 3. 3.3.1.1.2 inner minimum zone reference line minimum zone reference line inside the material See Figure 3. BS EN ISO 12780-1:2011ISO 12780-1:2011(E) 4 ISO 2011 All rights reserved3.3.1.1.3 mean minimum zone reference line arithmetic mean lin
43、e of the minimum zone reference lines See Figure 3. 3.3.1.2 least squares reference line line such that the sum of the squares of the local straightness deviations is a minimum See Figure 4. NOTE The symbol LS is used to refer to least squares reference elements and the symbol G (for Gaussian) is us
44、ed as a prefix for parameters based on least squares reference elements. Key 1 least squares reference line aPositive local straightness deviation. bNegative local straightness deviation. Figure 4 Least squares reference line 3.4 Terms relating to the filter function NOTE 1 If not otherwise specifie
45、d, the details of the filter characteristics are as specified in ISO 12780-2. NOTE 2 Only the phase correct mean line filter is currently defined (see ISO 11562). Consequently, the terms in this subclause relate only to this type of filter. Other filter methods are currently being investigated by IS
46、O. It is intended to incorporate these new filters in a future edition of this part of ISO 12780. 3.4.1 profile filter filter operating on an open profile transmitting a range of sinusoidal undulations for which the ratio of output to input amplitude is defined while attenuating (i.e. reducing) the
47、ratio for undulations lying outside the range at either or both ends 3.4.2 cut-off wavelength cut-off wavelength of the filter applied to the extracted line 3.4.3 transmission band for straightness profiles band of sinusoidal profile undulations which are transmitted by greater than a specified perc
48、entage by the filter, defined by the values of the upper and lower cut-off wavelengths NOTE The specified percentage is usually 50 %. BS EN ISO 12780-1:2011ISO 12780-1:2011(E) ISO 2011 All rights reserved 53.5 Terms relating to parameters 3.5.1 peak-to-valley straightness deviation value of the larg
49、est positive local straightness deviation added to the absolute value of the largest negative local straightness deviation NOTE 1 The peak-to-valley straightness deviation is defined for all reference lines. NOTE 2 The peak-to-valley straightness deviation is the only parameter that is defined for minimum zone reference lines. NOTE 3 The modifier GT is used in specifications to indicate that a form tolerance applies to the peak-to-valley deviation relative to the least squares reference element. 3.5.2
