1、November 2012 Translation by DIN-Sprachendienst.English price group 8No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).IC
2、S 83.080.20; 83.140.99!%N“2299343www.din.deDDIN 16941Thermoplastics extruded profiles General tolerances of size, form and orientation,English translation of DIN 16941:2012-11Extrudierte Profile aus thermoplastischen Kunststoffen Allgemeintoleranzen fr Mae, Form und Lage,Englische bersetzung von DIN
3、 16941:2012-11Profils extruds en matires de synthse thermoplastiques Tolrances gnrales concernant les cotes, la forme et ltat,Traduction anglaise de DIN 16941:2012-11SupersedesDIN 16941:1986-05www.beuth.deDocument comprises 11 pagesIn case of doubt, the German-language original shall be considered a
4、uthoritative.02.15DIN 16941:2012-11 2 A comma is used as the decimal marker. Contents Page Foreword . 3 1 Scope . 4 2 Normative references . 4 3 Tolerance series 4 4 General tolerances 5 4.1 General . 5 4.2 Cross section of profile 5 4.3 Longitudinal direction of profile 8 5 Indications on drawings
5、. 10 Bibliography . 11 DIN 16941:2012-11 3 Foreword This document has been prepared by Working Committee NA 054-04-02 AA Halbzeuge aus Thermoplasten of the Normenausschuss Kunststoffe (Plastics Standards Committee). Attention is drawn to the possibility that some of the elements of this document may
6、 be the subject of patent rights. DIN and/or DKE shall not be held responsible for identifying any or all such patent rights. Amendments This standard differs from DIN 16941:1986-05 as follows: a) normative references have been updated; b) the standard has been editorially revised. Previous editions
7、 DIN 16941: 1964-07, 1986-05 DIN 16941:2012-11 4 1 Scope This standard specifies general tolerances of size, form and position for extruded profiles made of thermoplastics, and is intended to simplify drawings and other documents (e.g. delivery conditions). This standard does not apply to extruded p
8、rofiles for which tolerances have been specified in other standards (e.g. dimensional standards, technical delivery conditions, RAL quality and test specifications). 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable
9、 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. DIN 406-10, Engineering drawing practice Dimensioning Concepts and general principles DIN 406-11, Engineering drawing
10、practice Dimensioning Principles of application DIN 874-1, Geometrical Product Specifications (GPS) Straight edges Part 1: Steel straight edges Dimensions, Technical delivery conditions DIN 874-2, Geometrical Product Specifications (GPS) Straight edges Part 2: Knife edge straight edges Dimensions, T
11、echnical delivery conditions DIN 876-1, Geometrical Product Specifications (GPS) Surface plates Part 1: Granite surface plates Requirements, inspection DIN 876-2, Geometrical Product Specifications (GPS) Surface plates Part 2: Cast iron surface plates Requirements, inspection DIN EN ISO 8015, Geomet
12、rical Product Specifications (GPS) Fundamentals Concepts, principles and rules DIN EN ISO 1101, Geometrical Product Specifications (GPS) Geometrical tolerancing Tolerances of form, orientation, location and run-out 3 Tolerance series This standard specifies three tolerance series representing differ
13、ent tolerance classes and divided into groups A and B. Group A applies to profiles which exhibit adequate stiffness and strength. Group B applies in cases where the inherent lack of stiffness of the extruded profile (e.g. in the case of soft thermoplastics) means that no permanent form deviation of
14、the cross section, of individual cross-sectional areas, or over the length of the profile occurs. Hence, for group B, no angular or geometrical tolerances have been specified. The distinction thus drawn takes account of the main factors which influence the deviations of size and form of profiles. Pa
15、rticular instances of such influences are the different properties and extrusion behaviour of thermoplastics, the various forming methods and extrusion processes, and the geometry of the profile cross sections. DIN 16941:2012-11 5 4 General tolerances 4.1 General The principles of tolerancing set ou
16、t in DIN EN ISO 8015 apply. If smaller tolerances are necessary or larger tolerances permitted and these are more economic, these shall be stated separately. Where these are tolerances of form and position (geometrical tolerances), the terms, definitions, symbols and indications according to DIN EN
17、ISO 1101 apply. Tolerances in accordance with the standard apply, for example, for drawings if reference is made to this standard as described in Clause 4. Only tolerances related to production are dealt with in this standard. The series of tolerances to be used shall be agreed between the parties i
18、nvolved (e.g. between the client and the firm accepting the order). It is recommended that tolerance series 3 be used for profiles that are of normal commercial quality but are not multi-walled and do not also comprise a second material. 4.2 Cross section of profile 4.2.1 General The limit deviation
19、s for linear dimensions and the geometrical tolerances apply to all cross-sectional planes of the profile at any point at right angles to the direction of extrusion. For profiles which also contain other materials, the general tolerances specified shall only apply to the thermoplastics content. 4.2.
20、2 Tolerances of size 4.2.2.1 General The general tolerances given in this standard shall apply for linear dimensions (e.g. external dimensions, internal dimensions, step dimensions, diameters, etc.), as specified in Table 1; wall thicknesses, as specified in Table 2; radii of curvature and chamfer h
21、eights (bevels), as specified in Table 3; angular dimensions (both those indicated and those not usually indicated, e.g. right angles (90), or angles of uniform polygons), as specified in Table 4. The general tolerances given in this standard do not apply for linear dimensions, wall thicknesses, and
22、 angular dimensions which are individually toleranced; auxiliary dimensions indicated in brackets (see DIN 406-10/-11); theoretically exact dimensions indicated in rectangular frames (datums) as in DIN EN ISO 1101; angular dimensions of circular graduations; 90 angles, not separately indicated, betw
23、een lines forming a system of coordinates. DIN 16941:2012-11 6 4.2.2.2 Linear dimensions Table 1 Limit deviations for linear dimensions Dimensions in millimetres Tole-rance series Nominal size range Up to 3 Over 3 up to 6 Over 6 up to 10 Over 10 up to 18 Over 18 up to 30 Over 30 up to 50 Over 50 up
24、to 80 Over 80 up to 120 Over 120 up to 180 Over 180 up to 250 Over 250 up to 320 Over 320 2A and 2B 0,3 0,4 0,5 0,6 0,7 0,8 1 1,2 1,4 1,7 2 0,8 % 3A and 3B 0,4 0,6 0,7 0,8 1 1,2 1,5 1,9 2,3 2,8 3,5 1,4 % 4A and 4B 0,5 0,7 0,9 1,1 1,4 1,8 2,3 2,9 3,6 4,5 5,6 2 % Table 2 Limit deviations for wall thic
25、knesses Dimensions in millimetres Tolerance series Nominal size range Up to 1,2 Over 1,2 up to 2,5 Over 2,5 up to 4 Over 4 up to 6,5 Over 6,5 up to 10 Over 10 2A and 2B 0,2 0,3 0,4 0,5 0,6 8 % 3A and 3B 4A and 4B 0,3 0,4 0,5 0,6 0,8 10 % Table 3 Limit deviations for radii of curvature and chamfer he
26、ights Dimensions in millimetres Tolerance series Nominal size range Up to 3 Over 3 up to 6 Over 6 up to 10 Over 10 up to 18 Over 18 up to 30 Over 30 up to 50 Over 50 2A, 3A and 4A 2B, 3B and 4B 0,5 20 % 18 % 15 % 15 % 12 % 10 % 4.2.2.3 Angular dimensions The limit deviations for angular dimensions s
27、hall apply irrespective of the actual local sizes of the lengths, i.e. the angular deviations may occur both at the maximum and the minimum limit of size of the linear dimensions. The permissible angular deviations do not limit the form deviations of the sides or faces forming an angle. DIN 16941:20
28、12-11 7 Table 4 Limit deviations for angular dimensions Dimensions in millimetres Tole-rance series Nominal size range of the shorter side of the angle Up to 1 Over 1 up to 3 Over 3 up to 6 Over 6 up to 10 Over 10 up to 18 Over 18 up to 30 Over 30 up to 50 Over 50 up to 80 Over 80 up to 120 Over 120
29、 up to 180 2A 0,2 0,3 0,3 0,4 0,6 0,8 1 1,4 1,8 2,5 3A 0,3 0,3 0,4 0,6 0,8 1 1,4 1,8 2,5 3,5 4A 0,3 0,4 0,6 0,8 1 1,4 1,8 2,5 3,5 5 NOTE See (informative) Annex A for details on the specification of limit deviations for angular dimensions. 4.2.3 Tolerances of form and position 4.2.3.1 General The to
30、lerances of form and position apply irrespective of the actual sizes of the workpiece features. Each individual tolerance requirement is to be met. The tolerances of form and position may thus also be applied in full in connection with features that make full use of their upper tolerance limits in e
31、very respect. 4.2.3.2 Straightness Straightness tolerances are given in Table 5. Table 5 Straightness tolerance Dimensions in millimetres Tolerance series Nominal size range Up to 18 Over 18 up to 30 Over 30 up to 50 Over 50 up to 80 Over 80 up to 120 Over 120 2A 0,3 0,3 0,4 0,6 0,8 0,8 % 3A 0,4 0,5
32、 0,6 0,8 1 1,1 % 4A 0,5 0,7 0,9 1,1 1,4 1,8 % According to DIN EN ISO 1101, a straightness tolerance is the area between two parallel lines within which the toleranced feature may lie at any point. Thus, between these straight lines, geometrical deviations may occur in any form (e.g. waviness). This
33、 may be undesirable for functional reasons (e.g. in the case of the visible surfaces of profiles). In such cases, the surfaces shall be identified as such and the accuracy required shall be indicated as appropriate (assessment). As a means of checking consistency between different deliveries, sample
34、s exhibiting limit values may, by agreement, be taken as the basis of assessment. DIN EN ISO 1101 also states that the deviations from straightness may occur without restriction on either side of a toleranced line. If in certain cases the deviation is to be restricted to only one side (direction), t
35、hen this shall be specifically indicated in drawings. DIN 16941:2012-11 8 4.2.3.3 Parallelism Parallelism tolerances are given in Table 6. Table 6 Tolerance on parallelism Dimensions in millimetres Tole-rance series Nominal size range Up to 3 Over 3 up to 6 Over 6 up to 10 Over 10 up to 18 Over 18 u
36、p to 30 Over 30 up to 50 Over 50 up to 80 Over 80 up to 120 Over 120 2A 0,3 0,4 0,5 0,6 0,6 0,7 0,8 1 1 % 3A 0,4 0,5 0,6 0,7 0,8 1 1,2 1,4 1,4 % 4A 0,5 0,6 0,8 1 1,2 1,4 1,6 1,8 1,8 % 4.3 Longitudinal direction of profile 4.3.1 General Deviations occur in the longitudinal direction of extruded profi
37、les independently of the deviations of their cross section. Such deviations relate to the length of the profile, and to the position of its cross-sectional axis with regard to its ideal axis in the longitudinal direction (direction of extrusion). 4.3.2 Tolerances of size 4.3.2.1 Linear dimensions Fo
38、r standard manufacturing lengths, the limit deviations given in Table 7 shall apply. Limit deviations for specified lengths shall be agreed upon. If profiles are supplied in the form of coils, then the relative limit deviations shall be 1,5 %. Table 7 Limit deviations for standard manufacturing leng
39、ths Dimensions in millimetres Tolerance series Nominal size range for standard manufacturing lengths Coils Up to 2 500 Over 2 500 up to 6 000 2A, 3A and 4A 20 30 2 % 2B, 3B and 4B +Ao 20 +Ao 30 +Ao 2 % Aois the upper limit deviation; the methods and materials used in the manufacture of profiles from
40、 soft thermoplastics preclude a specification of limit values which can have general validity. Where such values are required, they shall be specified by agreement. DIN 16941:2012-11 9 4.3.3 Tolerances of form and position 4.3.3.1 General Tolerances of form and position take account of the deviation
41、 of the profile from a straight line and the change in the position of the cross section in relation to the original cross section of the profile (torsion). If tolerances of form and position other than those in this standard are necessary to enable the profile to fulfil a particular function, these
42、 shall be agreed, as specified in DIN EN ISO 1101. 4.3.3.2 Straightness Extruded profiles cannot be manufactured entirely without deviation from straightness (in the longitudinal direction of the profile). The main factors responsible for this are the specific cooling behaviour of different thermopl
43、astics, the cross-sectional form of the profile, and the relationship between the separate wall thicknesses of a profile. The influence of these variables makes it impossible to specify straightness tolerances. If required, straightness tolerances tgshall be agreed by the parties concerned, e.g. by
44、the client and the firm accepting the order. The straightness tolerance tgshall be indicated in mm per 1 000 mm of profile length, together with the direction in relation to the cross section of the profile (see Figure 1). To determine the deviation from straightness, fg, the profile shall be placed
45、 on a workbench in order to be measured. Any external forces which might influence the actual deviation from the straight line shall be avoided. Dimensions in millimetres Key 1 straightedge (as specified in DIN 874-1 or DIN 874-2) 2 profile 3 surface plate (as specified in DIN 876-1 or DIN 874-2*) F
46、igure 1 Determination of the deviation from straightness in the longitudinal direction of the profile *) Translators note. Here it should read: “(as specified in DIN 876-1 or DIN 876-2)”. DIN 16941:2012-11 10 4.3.3.3 Torsion The torsion of a profile is determined by establishing the positional devia
47、tion of the original cross section of the profile when projected into the plane of test. The torsion tolerance, tv, is the permissible angular deviation of a straight line or form line (feature) of the test cross section of a profile in relation to the original cross section (see Figure 2). The tors
48、ion fvshall be indicated in degrees for a profile length of 1 000 mm. Table 8 Torsion tolerance, tv Dimensions in millimetres Tolerance series Diameter duUp to 30 Over 30 up to 60 Over 60 up to 120 Over 120 up to 180 Over 180 up to 250 Over 250 2A, 3A and 4A 5 4 3 30 3 2 30 2 Dimensions in millimetr
49、es Key 1 profile 2 surface plate a test cross section b original cross section dudiameter of the smallest circumscribed circle Figure 2 Determination of torsional deviation 5 Indications on drawings If general tolerances of size, form and orientation are to be applied in accordance with this standard, an i
