1、 No part of this translation may be reproduced without the 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).Ref. No. DIN 874-1:2003-11English price group 07 Sales No. 010708.
2、05Document comprises 4 pages.ICS 17.040.30Geometrische Produktspezikation (GPS) Lineale Teil 1: Flachlineale aus Stahl Mae, Technische LieferbedingungenIn keeping with current practice in standards published by the International Organization for Standardization (ISO), a comma has been used throughou
3、t as the decimal marker.874-1StraightedgesPart 1: Steel straightedges Dimensions and technical delivery conditions Translation by DIN-Sprachendienst.In case of doubt, the German-language original should be consulted as the authoritative text.ForewordThis standard has been prepared by Technical Commi
4、ttee Eindimensionale Lngenprftechnik of the Nor-menausschuss Technische Grundlagen (Fundamentals in Technology Standards Committee).AmendmentsThis standard differs from the August 1973 edition as follows:a) reference is made to DIN EN ISO 14253-1 regarding proof of conformance with this standard;b)
5、the standard has been editorially revised and brought up-to-date to reect current technology.Previous editionsDIN 874: 1931-10; DIN 874-1: 1973-08.1 ScopeThis standard species dimensions and tolerances for steel straightedges up to 5 000 mm in length.2 Normative referencesThis standard incorporates,
6、 by dated or undated reference, provisions from other publications. These nor-mative references are cited at the appropriate places in the text, and the titles of the publications are listed below. For dated references, subsequent amendments to or revisions of any of these publications apply to this
7、 standard only when incorporated in it by amendment or revision. For undated references, the latest edition of the publication referred to applies.DIN 2269 Measuring pinsDIN EN ISO 1 Geometrical product specications (GPS) Standard reference temperature for geo-metrical product specications and veric
8、ation (ISO 1:2002)DIN EN ISO 3650 Geometrical product specications (GPS) Length standards Gauge blocks (ISO 3650:1998)DIN EN ISO 14253-1 Geometrical product specications (GPS) Inspection by measurement of work-pieces and measuring equipment Part 1: Decision rules for proving conformance or non-confo
9、rmance with specications (ISO 14253-1:1998)ISO 1101:2004 Geometrical Product Specications (GPS) Geometrical tolerancing Tolerances of form, orientation, location and run-outISO 2768-1:1989 General tolerances Part 1: Tolerances for linear and angular dimensions without individual tolerance indication
10、s3 ConceptsFor the purposes of this standard, the concepts dened in ISO 1101 apply.DEUTSCHE NORM November 2003Supersedes August 1973 edition.Page 2DIN 874-1:2003-114 Dimensions and designation4.1 DimensionsDimensions of straightedges shall be as in table 1.General tolerances shall be class m toleran
11、ces as in ISO 2768-1.The designs shown in gures 1 and 2 are for illustrative purposes only; however, the dimensions of straight-edges shall be as specied here.Key1 Working face2 Side faceFigure 1: Steel straightedge up to 1 500 mm lengthKey1 Working face2 Side faceFigure 2: Steel straightedge from 2
12、 000 mm length (except for tolerance class 2 straightedges)Table 1: Dimensions (values in mm)Length, l ( 2) Up toSectional size for tolerance class00 1) and 0 1 2h b h b h b5007501 00050506010101240455089103035406781 5002 0002 50070801001415166070801214155060701012143 0004 0005 000120140182010012014
13、0161820801001201516181) Tolerance class 00 applies only to straightedges up to 1 000 mm in length.4.2 DesignationDesignation of a steel straightedge of 2 000 mm length and tolerance class 1:Steel straightedge DIN 874 2000 1Page 3DIN 874-1:2003-115 Requirements5.1 Reference temperature The reference
14、temperature shall be 20 C as in DIN EN ISO 1.5.2 Tolerances5.2.1 Flatness toleranceThe atness tolerance, t1, for working faces shall be determined using the equations given in table 2.Table 2: Equations for determining atness tolerance for working facesTolerance classFlatness tolerance, t100 1 m + 1
15、0015 106 l0 2 m +10010 106 l1 4 m + 1006 106 l2 8 m + 1004 106 lRounding the results obtained using the equations given above gives the tolerances listed in table 3. Table 3: Flatness tolerancesLength, l, in mmFlatness tolerances, t1, in m, for tolerance classUp to 00 0 1 25007501 00046879,512121721
16、2127331 5002 0002 5001722272937464658713 0004 0005 000324254718783108133The atness tolerances for side faces shall be three times the relevant values given in table 3 for working faces.5.2.2 Parallelism toleranceThe parallelism tolerance, t2, for working faces shall be twice the relevant value for t
17、he atness tolerance given in table 3.The parallelism tolerance for side faces shall be six times the relevant value for the atness tolerance given in table 3 for working faces.5.2.3 Perpendicularity toleranceThe tolerance on the perpendicularity of side faces to working faces, in reference to the de
18、pth, h, of the straight-edge shall be three times the relevant value for the atness tolerance given in table 3 for working faces.5.3 BevelsWorking faces may have a 0,5 mm bevel.Page 4DIN 874-1:2003-115.4 MaterialSteel straightedges shall be of alloyed steel of a grade either selected by the manufact
19、urer alone or in agree-ment with the customer.5.5 FinishWorking faces shall have a suitable nish.NOTE: Tolerance class 2 straightedges normally have working faces which are precision-ground, while class 00 and 0 edges are additionally scraped or lapped. Class 1 faces are scraped, if precision grindi
20、ng alone does not ensure that tolerances are met.6 Verication6.1 Flatness Deviations from atness shall be determined using a suitable material measure. The straightedge under test shall be supported at the points at which deection is lowest. Figure 3 shows these points for a straightedge of constant
21、 section.NOTE: Gauge blocks as in DIN EN ISO 3650 or measuring pins as in DIN 2269 are suitable supports.Figure 3: Support points for lowest deection6.2 ParalellismDeviations from paralellism may be determined using the support system described in subclause 6.1.6.3 Proof of conformanceProof of conformance with this standard shall be provided in accordance with DIN EN ISO 14253-1.
