1、DEUTSCHE NORM Februarv 1999 I DIN GPS - Geometrical tolerancing Positional tolerancing - IEN IS0 5458 (IS0 5458 : 1998) English version of DIN EN IS0 5458 ICs 01.1 00.20; 17.040.10 Supersedes DIN IS0 5458, July 1988 edition. Descriptors: GPS, geometrical tolerancing. Geometrische Produktspezifikatio
2、nen (GPS) - Form- und Lagetolerierung - Positionstolerierung (IS0 5458 : 1998) European Standard EN IS0 5458 : 1998 has the status of a DIN Standard. A comma is used as the decimal marker. National foreword This standard has been published in accordance with a decision taken by CEN/TC 290 to adopt,
3、without alteration, International Standard IS0 5458 as a European Standard. The responsible German body involved in its preparation was the Normenausschu Technische Grundlagen (Fundamentals in Technology Standards Committee). The DIN Standards corresponding to the International Standards referred to
4、 in clause 2 and Annex D of the EN are as follows: IS0 Standard DIN Standard IS0 1660 DIN IS0 1660 IS0 2692 DIN IS0 2692 IS0 5459 DIN IS0 5459 ISO/TR 14638 V DIN 32950 Amendments IS0 5458 having been adopted as a European Standard, the status of the corresponding DIN Standard (DIN IS0 5458) has been
5、 changed accordingly. Previous edition DIN IS0 5458: 1988-07 National Annex NA Standard referred to (and not included in Normative reference and Annex D) V DIN 32950 Geometrical product specification (GPS) - Masterplan (ISO/TR 14638 : 1995) EN comprises 13 pages. No pari of this standard may be repr
6、oduced without the prior permission of Ref. No. DIN EN IS0 5458 : 1999-0 Y Deutsches Institut fr Normung e. V., Berlin. wth Verlag GmbH, D-10772 Berlin, has the exclusive right of sale for German Standards (DIN-Normen). English price group 10 Sales No. 11 10 07.99 EUROPEAN STANDARD NORME EUROPENNE E
7、UROPISCHE NORM EN IS0 5458 December 1998 ICs 01.1 00.01 Descriptors: GPS, geometrical tolerancing. English version Geometrical Product Specifications (GPS) Posit ion al t o1 eran cing (IS0 5458 : 1998) Geometrical tolerancing Spcification gomtrique des Geometrische Produktspezifikationen produits (G
8、PS) - Tolrancement (GPS) - Form- und Lagetolerierung - gomtrique - Tolrancement de Positionstolerierung (IS0 5458 : 1998) localisation (IS0 5458 : 1998) This European Standard was approved by CEN on 1998-12-15. CEN members are bound to comply with the CENKENELEC Internal Regulations which stipulate
9、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 stand- ards may be obtained on application to the Central Secretariat or to any CEN member. The European Standards exist
10、 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 Central Secretariat has the same status as the official versions. CEN members are the national standards bodie
11、s of Austria, Belgium, the Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, the Netherlands, Norway, Portugal, Spain, Sweden, Switzerland, and the United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komi
12、tee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels O 1998. CEN - All rights of exploitation in any form and by any means reserved worldwide for CEN national members. Ref. No. EN IS0 5458 : 1998 E Page 2 EN IS0 5458 : 1998 Foreword International Standard IS0 5458:1998 Geometrical
13、 Product Specifications (GPS) - Geometrical tolerancing - Positional tolerancing, which was prepared by ISO/TC 21 3 Dimensional and geometrical product specifications and verification of the International Organization for Standardization, has been adopted by Technical Committee CEN/TC 290 Dimensiona
14、l and geometrical product specifications and verification, the Secretariat of which is held by DIN, as a European Standard. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, and conflicting national standards withdr
15、awn, by June 1999 at the latest. In accordance with the CENKENELEC Internal Regulations, the national standards organizations of the follow- ing countries are bound to implement this European Standard: Austria, Belgium, the Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland,
16、 Italy, Luxembourg, the Netherlands, Norway, Portugal, Spain, Sweden, Switzerland, and the United Kingdom. Endorsement notice The text of the International Standard IS0 5458 : 1998 was approved by CEN as a European Standard without any modification. Introduction This International Standard is a geom
17、etrical product specification (GPS) standard and is to be regarded as a general GPS standard (see ISOTTR 14638). It influences chain links 1 and 2 of the chain of standards on location. For more detailed information of the relation of this standard to the GPS matrix model, see annex C. This Internat
18、ional Standard is intended to promote the relationship between the designer and the manufacturer. The concept of positional tolerancing, as described in IS0 11 01, is further elaborated in this International Standard. The figures in this International Standard serve to illustrate the subject matter
19、only and are not necessarily complete. Other relevant International Standards, such as those dealing with the maximum material requirement (IS0 2692), datums and datum systems (IS0 5459), should be taken into consideration when using this International Standard. For the purposes of this Internationa
20、l Standard, all dimensions and tolerances on the drawings have been shown in vertical lettering. It should be understood that these indications could just as well be written in free-hand or inclined (italic) lettering without altering the meaning of the indications. For the presentation of lettering
21、 (proportions and dimensions), see IS0 3098-1. Page 3 EN IS0 5458 : 1998 1 Scope This International Standard describes positional tolerancing. This tolerancing method is applied to the location of a point, of a line nominally straight and of a surface nominally plane, e.g. the centre of a sphere, th
22、e axis of a hole or shaft and the median surface of a slot. NOTE see IS0 1660. Profile tolerancing is used when lines are not intended to be straight or surfaces are not intended to lie in a plane; 2 Normative reference The following standard contains provisions which, through reference in this text
23、, constitute provisions of this International Standard. At the time of publication, the edition indicated was valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent edition
24、 of the standard indicated below. Members of IEC and IS0 maintain registers of currently valid International Standards. IS0 1 1 O1 :-l), Geometrical Product Specifications (GPS) - Geometrical toierancing - Generalities, definitions, symbols, indication on drawings. 3 Definitions Definitions related
25、to features are under development and will be issued as IS0 14660-1. This work will result in new terms that are different from those used in this International Standard. These new terms are defined in annex A and appear in the main body of this International Standard in parentheses next to the curr
26、ently used term . 4 Establishment of positional tolerances 4.1 General The primary constituents are theoretically exact dimensions, tolerance zones and datums. 4.2 Fundamental requirement Positional tolerances are associated with theoretically exact dimensions and define the limits for the location
27、of actual (extracted) features, such as points, axes, median surfaces, nominally straight lines and nominally plane surfaces relative to each other or in relation to one or more datums. The tolerance zone is symmetrically disposed about the theoretically exact location. l) To be published. (Revision
28、 of IS0 1101:1983) Page 4 EN IS0 5458 : 1998 NOTE Positional tolerances do not accumulate when theoretically exact dimensions are arranged in a chain (see figure 4). (This contrasts with dimensional tolerances that are arranged in a chain.) Positional tolerancing allows clear reference to be made to
29、 one or more datums. 4.3 Theoretically exact dimensions Theoretically exact dimensions, both angular and linear, are indicated by being enclosed in a rectangular frame in accordance with IS0 11 01. This is illustrated in figures 2 a), 2 b), 3 a), 4 a), 5 a) and 7 a). The theoretically exact dimensio
30、ns O“ and go“, 180“ or distance O between - positionally toleranced features not related to a datum see figure 4 a) and figure 5 a), - positionally toleranced features related to the same datum(s) see figure 2 a), - positionally toleranced features and their related datums (see figure l), are implie
31、d without specific indication. When the positional tolerance features share the same centreline or axis they are regarded as theoretically exactly related features, unless otherwise specified, e.g. in relation to different datums or other reason indicated by an appropriate note on the drawing as sho
32、wn in figure 2 b). Indication on the drawing Explanation 3- qi 7 u 7-1 l w Cases a), b), c) or d) may apply at each individual hole: a) axis of hole coincident with theoretically exact location (zero deviation); b) axis of hole at maximum position deviation with zero perpendicularity deviation; c) a
33、xis of hole at maximum position deviation with maximum perpendicularity deviation; d) axis of hole at maximum position deviation; in this case a combination of geometrical deviations. Figure 1 Page 5 EN IS0 5458 : 1998 4.4 Positional tolerances on a complete circle When positionally toleranced featu
34、res are arranged in a complete circle it is understood that the features are equally spaced, unless otherwise stated, and that their locations are theoretically exact. If two or more groups of features are shown on the same axis, they shall be considered to be a single pattern when - they are not re
35、lated to a datum; - they are related to the same datum or datum system (datums in the same order of precedence or under the same material conditions) see figure 2 a); unless otherwise stated see figure 2 b). T Ln O O0 I “3 tr 81 i .- Figure 2 a) I Angular Location optional Figure 2 b) Page 6 EN IS0
36、5458 : 1998 4.5 Directions of positional tolerances 4.5.1 Positional tolerances in one direction only The tolerance value can be specified in one direction. The orientation of the width of the tolerance zone is based on the pattern of the theoretically exact dimensions and is at O“ or 90“ as indicat
37、ed by the direction of the arrow line see figures 3 a) and 3 b) unless otherwise indicated. Indication on the drawing o 4-012345 Figure 3 a) Explanation c/ 10 i 10 1 10 1 10 1 10 1- -1- -1- - Key 1 Simulated datum A 2 Simulated datum B Each of the scale lines shall be contained within a tolerance zo
38、ne defined by two parallel straight lines 0,l apart which are symmetrically disposed about the theoretically exact position of each scale line relative to each other. Figure 3 b) Page 7 EN IS0 5458 : 1998 4.5.2 Positional tolerances in two directions The tolerance value can be specified in two direc
39、tions perpendicular to each other, reference being made to unequal values see figures 4 a) and 4 b) or equal values. Indication on the drawing I T- i-“ Figure 4 a) Explanation F 30 - Figure 4 b) The rectangular pattern consisting of the eight tolerance zones, placed 30 rnm apart from each other, is
40、a floating one, the location and orientation of which depends on the considered actual (extracted) features of the workpiece. Each of the holes shall be: - measured in the direction of the theoretically exact dimension 30; its actual (extracted) median surface lies within a tolerance zone with a rec
41、tangular cross section 0,3 x actual length of the feature; - measured in the direction of the theoretically exact dimension 28; its actual (extracted) median surface lies within a tolerance zone with a rectangular cross section 0,l x actual length of the feature; - the median planes of the tolerance
42、 zones are fixed by theoretically exact dimensions Page 8 EN IS0 5458 : 1998 4.5.3 Multi-directional positional tolerances The tolerance is specified as a cylindrical zone see figures 5 a) and 5 b). The “rigid rectangular pattern“ consisting of the eight tolerance zones, placed 30 mm apart from each
43、 other, may be implied by a best fit (rotations and translations) to the centre pointhe data from the actual (extracted) features of the workpiece. Indication on the drawing 8-10 L(6- I -o-+-43 l i Figure 5 a) Explanation 11- -8- 0.1 30 30 30 4 7- The actual (extracted) axis of each hole shall lie w
44、ithin a cylindrical tolerance zone of diameter 0,l mm; the axes of the cylindrical tolerance zones are fixed by theoretically exact dimensions. Figure 5 b) NOTE For cylindrical features of mating parts, the tolerance zone is usually cylindrical, as the positional tolerance is multi-directional trom
45、the theoretically exact location. In these cases the positional tolerancing method achieves a larger tolerance zone than in the two directions method which can only generate a square (or rectangular) two dimensional tolerance zone; see figure 6. The choice between “multi-directional“ and “in two dir
46、ections“ tolerance zone should be made according to the function of the toleranced feature. Key 1 57 % larger zone Figure 6 Page 9 EN IS0 5458 : 1998 5 Tolerance combinations 5.1 If a group of features is individually located by positional tolerancing and their pattern location is also located by po
47、sitional tolerancing, each requirement shall be met independently see figure 7 a). 5.2 The actual (extracted) axis of each of the four holes shall lie within the cylindrical tolerance zone of diameter 0,Ol; the positional tolerance zones are located in their theoretically exact positions to each oth
48、er and perpendicular to datum A see figure 7 b). 5.3 The actual (extracted) axis of each holes shall lie within the cylindrical tolerance zone of diameter 0,2; the positional tolerance zones are perpendicular to datum A and located in their exact theoretical positions in relation to each other and t
49、o the datums B and C see figure 7 c). Indication on the drawing Key 1 Simulated datum A 1 P 4x015 W w Figure 7 a) Explanation 1 -? L! i- -t“l 35 -1 Key 1 2 3 J Simulated datum A Simulated datum B Simulated datum C Figure 7 b) Figure 7 c) Page 10 EN IS0 5458 : 1998 Annex A (informative) Definitions For full details, see IS0 14660-1. feat u re point, line or surface integral feature surface or line on a surface derived feature centre point, median line or median surface derived from one or more integral features feature of size geometric shape
