1、BS EN 12020-2:2016Incorporating corrigendum March 2017BS EN 12020-2:2016Aluminium and aluminium alloys Extruded precision profiles in alloys EN AW-6060 and EN AW-6063Part 2: Tolerances on dimensions and formBSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06BS EN 12020-
2、2:2016 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 12020-2:2016, incorporating corrigendum March 2017. It supersedes BS EN 12020-2:2008 which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee NFE/35, Light metals and t
3、heir alloys.A 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. The British Standards Institution 2017. Published
4、by BSI Standards Limited 2017ISBN 978 0 580 98081 7ICS 77.150.10Compliance 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 31 December 2016.Amendments/corrigenda issued sin
5、ce publicationDate Text affected30 June 2017 Implementation of CEN corrigendum March 2017: see CEN foreword for detailsEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 12020-2 December 2016 ICS 77.150.10 Supersedes EN 12020-2:2008 English Version Aluminium and aluminium alloys - Extruded precisi
6、on profiles in alloys EN AW-6060 and EN AW-6063 - Part 2: Tolerances on dimensions and form Aluminium et alliages daluminium - Profils de prcision fils en alliages EN AW-6060 et EN AW-6063 - Partie 2 : Tolrances sur dimensions et forme Aluminium und Aluminiumlegierungen - Stranggepresste Przisionspr
7、ofile aus Legierungen EN AW-6060 und EN AW-6063 - Teil 2: Grenzabmae und Formtoleranzen This European Standard was approved by CEN on 4 March 2016. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of
8、 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. This European Standard exists in three official versions (English, French, German)
9、. 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 members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, C
10、yprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United
11、Kingdom. This document consolidates EN 12020-2:2016 and the corrigendum EN 12020-2:2016/AC:2017. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2016 CEN All rights of exploitation i
12、n any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12020-2:2016 E EN 12020-2:2016 (E) 2 Contents PageEuropean foreword . 3 1 Scope 4 2 Normative references 5 3 Tolerances on dimensions . 5 3.1 General 5 3.2 Cross-sectional dimensions . 5 3.3 Length 7 3.4 Squareness
13、of cut ends 8 3.5 Length offset for profiles with a thermal barrier 8 4 Tolerances on form 8 4.1 Parallelism . 8 4.2 Straightness . 9 4.3 Convexity-Concavity 10 4.4 Contour 11 4.5 Twist . 12 4.6 Angularity . 14 4.7 Corner and fillet radii . 15 Bibliography . 17 BS EN 12020-2:2016EN 12020-2:2016 (E)
14、3 European foreword This document (EN 12020-2:2016) has been prepared by Technical Committee CEN/TC 132 “Aluminium and aluminium alloys”, 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
15、by endorsement, at the latest by June 2017, and conflicting national standards shall be withdrawn at the latest by June 2017. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN shall not be held responsible for identifying any or
16、 all such patent rights. This document supersedes EN 12020-2:2008. The following technical modifications have been introduced during the revision: subclause 4.1, Parallelism; subclause 4.2, Straightness; subclause 4.5, Twist. EN 12020 comprises the following parts under the general title “Aluminium
17、and aluminium alloys Extruded precision profiles in alloys EN AW-6060 and EN AW-6063”: Part 1: Technical conditions for inspection and delivery Part 2: Tolerances on dimensions and form This document includes the corrigendum EN 12020-2:2016/AC:2017 which requests the deletion of the paragraph below
18、Figure 6 in 4.2, the deletion of Figure 7a) and 7b) and the renumbering of the subsequent figures throughout the text, as well as the cross references to them. According to the CEN-CENELEC Internal Regulations, the national standards organisations of the following countries are bound to implement th
19、is European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovak
20、ia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 12020-2:2016EN 12020-2:2016 (E) 4 1 Scope This European Standard specifies tolerances on dimensions and form of extruded precision profiles, in alloys EN AW-6060 and EN AW-6063 manufactured with and without a thermal barr
21、ier (see Figures 1 and 2). It applies to extruded products supplied without further surface treatment. Precision profiles covered in this standard are distinguished from extruded profiles for general applications covered in EN 755-9 by the following characteristics: they are mainly for architectural
22、 applications; they meet more stringent requirements regarding the surface condition of visible surfaces; the maximum diameter of the circumscribing circle CD is 350 mm; they are made to closer tolerances on dimensions and form. In the case of profiles which, due to the complexity of their design, a
23、re difficult to manufacture and specify, then special agreements between supplier and purchaser may need to be reached. NOTE The effect of the thermal barrier material on the dimensional tolerances is covered by this document although the actual thermal barrier material itself is not (see EN 14024).
24、 Key 1 CD maximum 350 mm Key 1 CD maximum 350 mm 2 thermal barriers Figure 1 Profile without thermal barrier Figure 2 Profile containing thermal barrier BS EN 12020-2:2016EN 12020-2:2016 (E) 5 2 Normative references The following documents, in whole or in part, are normatively referenced in this doc
25、ument and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN ISO 1101, Geometrical product specifications (GPS) Geometrical tolerancing Tolerances of
26、 form, orientation, location and run-out (ISO 1101) 3 Tolerances on dimensions 3.1 General If, for compelling reasons, tolerances closer than those specified in 3.2.2 are required, these shall only be specified for dimensions that are critical to the function, subject to specific agreement between s
27、upplier and purchaser. Any such reduction shall not exceed two-thirds of the values specified in this standard and is subject to a minimum tolerance band of 0,3 mm. 3.2 Cross-sectional dimensions 3.2.1 General The tolerances of the following dimensions (see Figure 3) are specified in Tables 1 and 2.
28、 A: wall thicknesses except those enclosing the hollow spaces in hollow profiles; B: wall thicknesses enclosing the hollow spaces in hollow profiles, except those between two hollow spaces; C: wall thicknesses between two hollow spaces in hollow profiles; E: the length of the shorter leg of profiles
29、 with open ends; H: all dimensions (except wall thickness) between points on the cross section of the profile or the centres of open screw holes, including open ends. Figure 3 Definition of dimensions A, B, C, E, H BS EN 12020-2:2016EN 12020-2:2016 (E) 6 3.2.2 Tolerances on dimensions other than wal
30、l thickness The tolerances for dimension H shall be as specified in Table 1. Table 1 Tolerances on cross-sectional dimensions Dimensions in millimetres Dimension H Tolerances on H Tolerances on H (open ends) Over Up to and including (except open ends) E 60 60 10 000 - 100 +5 0 +7 0 +1 0 0 Subject to
31、 agreement between supplier and purchaser 100 200 +7 0 +9 0 +12 0 200 350 +8 0 + 1 1 0 +14 0 If no fixed or minimum length is specified in the order, profiles may be delivered in random lengths. The length range and the tolerances on the random lengths shall be subject to agreement between supplier
32、and purchaser. BS EN 12020-2:2016EN 12020-2:2016 (E) 8 3.4 Squareness of cut ends The squareness of cut ends shall be within half of the fixed length tolerance range specified in Table 3 for both fixed and random lengths, e.g. for a fixed length tolerance of + 100 mm the deviation from squareness of
33、 cut ends shall be within 5 mm measured over all the complete cross sectional width of the profile. 3.5 Length offset for profiles with a thermal barrier Length offset K, see Figure 4, for profiles with a thermal barrier shall be within the tolerance range for the fixed length specified in Table 3,
34、e.g. for a fixed length tolerance of+ 100 mm the length offset shall be within 10 mm. Key 1 length of profile 2 profile 1 3 thermal barrier 4 profile 2 Figure 4 Length offset K 4 Tolerances on form 4.1 Parallelism Requirements on parallelism / of opposite outer planes shall be subject of agreement b
35、etween supplier and purchaser and shall be specified on the drawing. Parallelism shall be marked on the drawing as specified in Figure 5, using the / symbol as in EN ISO 1101. Tolerances on parallelism shall not increase tolerances on dimensions, i.e. shall always lie within dimensional tolerances o
36、r tolerance ranges. Where outer planes are of unequal length, the longer one shall be taken as contact reference. Two clearly defined reference points shall specify the width of the parallelism measurement. The tolerance on parallelism / for outer parallel dimension H apply for cross sectional measu
37、rements in a single plane. The value for parallelism may be selected in accordance with the tolerance range given in Table 1 (including those for open ends). BS EN 12020-2:2016EN 12020-2:2016 (E) 9 Example Dimension H = 50 0,4, i.e. possible parallelism /0,8. Requirements in Figure 5 (/, 0,4) is an
38、example only. Tolerances to be according to Table 1: Figure 5 Marking parallelism for convex and concave surfaces 4.2 Straightness Deviations from straightness, hsand ht, shall be measured as shown in Figure 6, with the profile placed on a horizontal base plate so that its mass decreases the deviati
39、on. The straightness tolerance htshall be as specified in Table 4. The local deviation from straightness hsshall not exceed 0,3 mm per 300 mm length. Key 1 base plate 2 straight edge Figure 6 Measurement of deviation from straightness nulldeleted textnull BS EN 12020-2:2016EN 12020-2:2016 (E) 10 Sho
40、uld other cases of interpretation and measurement be encountered then the specific requirements and method of measurement shall be subject to agreement between supplier and purchaser. Table 4 Straightness tolerances Dimensions in millimetres Straightness tolerance htfor specified length L L 1 000 1
41、000 6 000 0,7 1,3 1,8 2,2 2,6 3,0 3,5 4.3 Convexity-Concavity The convexity-concavity f shall be measured as shown in Figures 8 and 9. The tolerances shall be as specified in Table 5. Key W = width f = deviation W1 = 100 mm f1 = local deviation per any 100 mm nullFigure 7null Measurement of convexit
42、y concavity for hollow section BS EN 12020-2:2016EN 12020-2:2016 (E) 11 Key 1 base plate W = width f = deviation W1 = 100 mm f1 = local deviation per any 100 mm nullFigure 8null Measurement of convexityconcavity for open section Table 5 Convexity-concavity tolerances Dimensions in millimetres Width
43、W Maximum allowable deviation f Over Up to and including - 30 0,20 30 60 0,30 60 100 0,40 100 150 0,50 150 200 0,70 200 250 0,85 250 300 1,0 300 350 1,2 In the case of profiles with a width W of over 150 mm, the local deviation f1shall not exceed 0,50 mm for any width W1of 100 mm. 4.4 Contour For pr
44、ofiles with curved cross sections, the deviation at any point of the curve, from the theoretically exact line as defined by the drawing shall not be greater than the appropriate tolerance C specified in Table 6. Considering all points on the curve, a tolerance zone shall be defined as the zone betwe
45、en two envelopes running tangentially to all circles of diameter C which can be drawn with their centres lying along the theoretically exact line; this is shown in nullFigure 9null. BS EN 12020-2:2016EN 12020-2:2016 (E) 12 nullFigure 9null Definition of contour tolerances Table 6 Contour tolerances
46、Dimensions in millimetres Width W of the contour Contour tolerance = Over Up to and including Diameter C of the tolerance circle - 30 0,30 30 60 0,50 60 90 0,70 90 120 1,00 120 150 1,20 150 200 1,50 200 250 2,00 250 300 2,50 300 350 3,00 NOTE Contour tolerances can be checked by placing a section of
47、 the profile on a scale projection of the drawing with the contour tolerance indicated on the drawing. Another possible method is the use of suitable gauge (min./max.). 4.5 Twist Twist T shall be measured as shown in nullFigure 10null by placing the profile on a flat base plate, the profile resting
48、under its own mass. As shown in nullFigure 10null, twist is determined by measuring the maximum distance between the bottom surface of the profile and the surface of the base plate. Tolerances shall be specified in Table 7 as a function of the width W and the length L of the profile. BS EN 12020-2:2
49、016EN 12020-2:2016 (E) 13 Key 1 base plate nullFigure 10null Measurement of twist nullFigure 10null shows an example of a simple case of twist. There are other possibilities where the twist has to be identified differently. Some examples are given below: Differing positioning of the profile on the base plate such that the maximum twist has to be calculated as the sum of two separate measurements on the diagonal end positions. Discontinuous twist over the profile length such that the maxim
