1、BRITISH STANDARD BS EN ISO 8785:1999 Geometrical Product Specification (GPS) Surface imperfections Terms, definitions and parameters The European Standard EN ISO 8785:1999 has the status of a British Standard ICS 01.040.17; 17.040.20 BS EN ISO 8785:1999 This British Standard, having been prepared un
2、der the direction of the Consumer Products and Services Sector Committee, was published under the authority of the Standards Committee and comes into effect on 15 October 1999 BSI 15 September 2002 ISBN 0 580 35154 8 National foreword This British Standard is the English language version of EN ISO 8
3、785:1999. It is identical with ISO 8785:1998. The UK participation in its preparation was entrusted to Technical Committee TDE/4, Engineering drawing, Metrology, Precision measurement and other related documentation, which has the responsibility to: aid enquirers to understand the text; present to t
4、he responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this committee can be obtain
5、ed on request to its secretary. Cross-references Attention is drawn to the fact that CEN and CENELEC Standards normally include an annex which lists normative references to international publications with their corresponding European publications. The British Standards which implement international
6、or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all t
7、he necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. NOTE This is a special English language version of BS EN ISO 8785:1999 produced specifically
8、for this CD ROM. The hard copy form of BS EN ISO 8785:1999 consists of both English and French text and can be purchased from Customer Services. Summary of pages This document comprises a front cover, an inside front cover, the EN ISO title page, the EN ISO foreword page, the ISO title page, pages i
9、i to iv, pages 1 to 18, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 8785 July 1999 ICS 01.040
10、.17; 17.040.20 Descriptors: geometrical product specifications, surfaces, surface condition, surface defects, imperfections, definitions, vocabulary. English version Geometrical product specification (GPS) Surface imperfections Terms, definitions and parameters (ISO 8785:1998) Spcification gomtrique
11、 des produits (GPS) I m p e r f e c t i o n s d e s u r f a c e T e r m e s , d f i n i t i o n s e t paramtres (ISO 8785:1998) Geometrische Produktspezifikation (GPS) Oberflchenunvollkommenheiten Begriffe, Definitionen und Kenngr en (ISO 8785:1998) This European Standard was approved by CEN on 26 M
12、ay 1999. CEN members are bound to comply with 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 obta
13、ined on application to the Central Secretariat 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 Central Secr
14、etariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN E
15、uropean Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1999 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 8785:1999 EEN ISO
16、 8785:1999 BSI 15 September 2002 Foreword The text of the International Standard from Technical Committee ISO/TC 213 “Dimensional and geometrical product specifications and verification” of the International Organization for Standardization (ISO) has been taken over as a European Standard by Technic
17、al Committee CEN/TC 290 “Dimensional and geometrical product specification and verification”, the secretariat of which is held by DIN. 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 January 2000,
18、 and conflicting national standards shall be withdrawn at the latest by January 2000. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland,
19、France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of the International Standard ISO 8785:1998 has been approved by CEN as a European Standard without any modification.EN ISO 8785
20、:1999 ii BSI 15 September 2002 Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body intere
21、sted 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 take part in the work. ISO collaborates closely with the International Electrotechnical
22、Commission (IEC) on all matters of electrotechnical standardization. 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. Inte
23、rnational Standard ISO 8785 was prepared by Technical Committee ISO/TC 213, Dimensional and geometrical product specifications and verification. Annex A and Annex B of this International Standard are for information only.EN ISO 8785:1999 BSI 15 September 2002 iii Introduction This International Stan
24、dard is a geometrical product specification (GPS) standard and is to be regarded as a general GPS standard (see ISO/TR 14638). It influences the chain links 1 and 2 of the chain of standards for surface imperfections. For more detailed information of the relation of this standard to other standards
25、and the GPS matrix mode, see Annex A.iv blankEN ISO 8785:1999 BSI 15 September 2002 1 1 Scope This International Standard defines terms relating to surface imperfections in order to establish a common vocabulary to be used in technical documents, technical drawings, scientific publications, etc. to
26、specify to what extent surface imperfections are allowed and to aid in the specification of methods of measuring surface imperfections. The surface imperfections defined in this International Standard are not related to surface roughness 1)or surface waviness. It does not specify the desirability or
27、 undesirability of surface imperfections, which depend on the application or function of the surface. For specific applications and manufacturing processes, additional terms and definitions may be necessary. Such terms and definitions will be specified in relevant International Standards. Some types
28、 of specific surface imperfections are defined in other International Standards as well. 2 General 2.1 reference surface surface, having the form of a geometrical surface, from which the parameters of surface imperfections are assessed NOTE 1 The reference surface passes through the highest peak of
29、the real surface excluding the imperfections, and is equidistant from the mean surface determined by the least-squares method. NOTE 2 The reference surface is determined over a specified surface area, or over a limited part of the surface area related to the size (dimensions) of a single imperfectio
30、n, the size of the area being sufficient to assess the imperfection while suppressing the influence of form deviation on the assessment. NOTE 3 The reference surface coincides in practice with the surface of the area adjacent to the imperfection. 2.2 surface imperfection evaluation area A portion of
31、 the real surface or the whole real surface of a workpiece on which surface imperfections are specified and inspected 2.3 surface texture repetitive or random deviations from the geometrical surface which form the three-dimensional topography of the surface NOTE Surface texture includes roughness, w
32、aviness, lay, imperfections and form deviations over a limited surface area. 2.4 surface imperfection SIM element, irregularity or group of elements and irregularities of the real surface unintentionally or accidentally caused during manufacture, storage or use of the surface NOTE 1 It is recommende
33、d not to use the term “surface defect” for the meaning defined here (see definition of “defect” in ISO 8402) NOTE 2 Such types of elements or irregularities differ considerably from those constituting a rough surface. NOTE 3 The presence of imperfection on the real surface does not necessarily mean
34、that the given surface is unsuitable for use. The acceptability of an imperfection is dependent on the application or function of the surface and is specified in appropriate terms, e.g. length, depth, width, height, number per unit area, etc. 1) See for example ISO 4287.EN ISO 8785:1999 2 BSI 15 Sep
35、tember 2002 3 Characteristics and parameters of surface imperfections NOTE The maximum value of parameters and characteristics of surface imperfections allowed on a surface is that value applied for specification, i.e. the limit beyond which the component containing the imperfection is rejected. EXA
36、MPLES SIM n= 60 where SIM nis the surface imperfection number as defined in 3.7 SIM n /A = 60/1 m 2 SIM n /A = 10/50 mm 2 where A is the surface imperfection evaluation area as defined in 2.2 3.1 surface imperfection length SIM e greatest dimension of the surface imperfection, measured parallel to t
37、he reference surface 3.2 surface imperfection width SIM w greatest dimension of the surface imperfection, measured normal to the surface imperfection length and parallel to the reference surface 3.3 single surface imperfection depth SIM sd greatest depth of the surface imperfection, measured from an
38、d perpendicular to the reference surface 3.3.1 combined surface imperfection depth SIM cd distance between the reference surface and the lowermost point of the surface imperfection, measured from and perpendicular to the reference surface 3.4 single surface imperfection height SIM sh greatest height
39、 of the surface imperfection, measured from and perpendicular to the reference surface 3.4.1 combined surface imperfection height SIM ch distance between the reference surface and the uppermost point of the surface imperfection, measured from and perpendicular to the reference surface 3.5 surface im
40、perfection area SIM a area of a single surface imperfection projected onto the reference surfaceEN ISO 8785:1999 BSI 15 September 2002 3 3.6 total surface imperfection area SIM t area equal to the sum of the individual surface imperfection areas, within the agreed limits of discrimination NOTE 1 The
41、 total surface imperfections area is calculated as: SIM t= SIM a1+ SIM a2+ + SIM an NOTE 2 When specifying the agreed limits of discrimination, the dimensional criterion that should be used is the minimum dimension of surface imperfection characteristic below which the surface imperfection is neglec
42、ted when determining the SIM nand SIM tvalues. 3.7 surface imperfection number SIM n number of surface imperfections on the total real surface, within the agreed limits of discrimination 3.8 number of surface imperfections per unit area SIM n /A number of surface imperfections on the specified surfa
43、ce imperfection evaluation area A 4 Specific types of surface imperfections 4.1 recession inwardly directed surface imperfection 4.1.1 groove surface imperfection which is a longitudinal recession with a rounded or flat bottom See Figure 1. 4.1.2 scratch surface imperfection which is a recession of
44、irregular shape and unspecified direction See Figure 2. Figure 1EN ISO 8785:1999 4 BSI 15 September 2002 4.1.3 crack linear recession with a sharp bottom resulting from a disturbance of the integrity of the surface, and of the parent material of the workpiece See Figure 3. 4.1.4 pore cavity of very
45、small size with steeply sloping walls and, normally, sharp edges, where the upper edges of the cavity are not higher than the tangential reference surface See Figure 4. Figure 2 Figure 3 Figure 4EN ISO 8785:1999 BSI 15 September 2002 5 4.1.5 blowhole surface imperfection in the form of a single rece
46、ssion resulting from the loss of foreign particles, from etching or from the effect of gas See Figure 5. 4.1.6 shrinkage hole recession caused by shrinkage during solidification of a casting, a weld, etc. See Figure 6. 4.1.7 fissure chink crevice sharp, cleft-like, irregular opening of small depth S
47、ee Figure 7. Figure 5 Figure 6EN ISO 8785:1999 6 BSI 15 September 2002 4.1.8 wane imperfection in the form of a rounded-off part at the intersection of two workpiece surfaces See Figure 8. 4.1.9 (concave) buckle recession on the surface of sheet material caused by local bending See Figure 9. 4.1.10
48、dent hollow with no raised portion, often caused by plastic deformation resulting from an impression or blow See Figure 10. Figure 7 Figure 8 Figure 9EN ISO 8785:1999 BSI 15 September 2002 7 4.2 raising outwardly directed surface imperfection 4.2.1 wart ridge-like or hill-like elevation of small siz
49、e and limited height See Figure 11. 4.2.2 blister local convexity caused by a subsurface inclusion of gas or liquid See Figure 12. Figure 10 Figure 11 Figure 12EN ISO 8785:1999 8 BSI 15 September 2002 4.2.3 (convex) buckle raising on the surface of sheet material caused by local bending See Figure 13. 4.2.4 scale flake-like, partially, detached raising of small thickness, resulting from flaking of the surface layer, which is of a different composition
