BS-EN-10251-1997.pdf

| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN 10251 : 1997 The European Standard EN 10251 : 1997 has the status of a British Standard ICS 29.030; 77.140.40 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Magnetic materials Ð Methods of determination of the geometrical characteristics of electrical steel sheet and strip BS EN 10251 : 1997 This British Standard, having been prepared under the direction of the Engineering Sector Board, was published under the authority of the Standards Board and comes into effect on 15 September 1997 BSI 1997 The following BSI references relate to the work on this standard: Committee reference ISE/NFE/5 Draft for comment 86/35472 DC ISBN 0 580 27698 8 Amendments issued since publication Amd. No.DateText affected Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee ISE/NFE/5, Magnetic alloys and steels, upon which the following bodies were represented: Association of Manufacturers Allied to the Electrical and Electronic Industry (BEAMA Ltd.) British Steel Industry Department of Trade and Industry (National Physical Laboratory) Electricity Supply Industry in England and Wales Electronic Components Industry Federation GAMBICA (BEAMA Ltd.) Institute of Physics Rotating Electrical Machines Association (BEAMA Ltd.) Sunderland Polytechnic (Magnet Centre) Transmission and Distribution Association (BEAMA Ltd.) Wolfson Centre for Magnets Technology Co-opted members BS EN 10251 : 1997 BSI 1997i Contents Page Committees responsibleInside front cover National forewordii Foreword2 Text of EN 102513 ii BSI 1997 BS EN 10251 : 1997 National foreword This British Standard has been prepared by Technical Committee ISE/NFE/5 and is the English language version of EN 10251 : 1997, Magnetic materials Ð Methods of determination of geometrical characteristics of electrical steel sheet and strip. It supsersedes BS 6404 Magnetic materials Ð Part 9 : 1988 Methods for determination of the geometrical characteristics of magnetic steel sheet and strip, which is withdrawn. Cross-references International standardCorresponding British Standard IEC 404-1BS 6404 Magnetic materials Part 1 : 1984 Classification Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the EN title page, pages 2 to 10, an inside back cover and a back cover. CEN European Committee for Standardization Comite  Europe Âen de Normalisation Europa Èisches Komitee fu Èr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1997 Copyright reserved to CEN members Ref. No. EN 10251 : 1997 E EUROPEAN STANDARDEN 10251 NORME EUROPE ÂENNE EUROPA ÈISCHE NORM January 1997 ICS 29.040.10; 77.140.50 Descriptors: Metal plates, magnetic alloys, magnetic circuits, steels, tests, determination, geometric characteristics, definitions, flatness, straightness, curvature English version Magnetic materials Ð Methods of determination of the geometrical characteristics of electrical steel sheet and strip Mate Âriaux magne Âtiques Ð Me Âthodes de de Âtermination des caracte Âristiques ge Âome Âtriques des to Ãles magne Âtiques en acier Magnetische Werkstoffe Ð Verfahren zur Bestimmung der geometrischen Kenngro Èûen von Electroblech und-band This European Standard was approved by CEN on 1995-10-21. 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 obtained 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 Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. Page 2 EN 10251 : 1997 BSI 1997 Foreword This European Standard has been prepared by the Technical Committee ECISS/TC 24, Electrical steel and strip qualities Ð Qualities, dimensions, tolerances and specific tests, the secretariat of which is held by AFNOR. This European Standard is technically in accordance with CEI 404-9. 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 July 1997, and conflicting national standards shall be withdrawn at the latest by July 1997. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Contents Page Foreword2 1Scope3 2Normative references3 3Definitions3 4Test methods3 5Test report4 Page 3 EN 10251 : 1997 BSI 1997 1 Scope This European Standard is intended to define the test methods used for the determination of the following geometrical characteristics of electrical steel sheet and strip: ± flatness; ± residual curvature; ± edge camber; ± deviation from the shearing line due to internal stresses; ± burr height of cut edges. This European Standard applies to electrical steel sheet and strip intended for the construction of magnetic circuits and corresponds to clauses B2, C21 and C22 of IEC 404-1. 2 Normative references This European Standard incorporates by dated or undated references, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. IEC 404-1Magnetic materials Ð Part 1 : Classification 3 Definitions For the purposes of this standard the following definitions apply. 3.1 flatness (wave factor) Property of a sheet or length of strip which is characterized by the wave factor i.e. by the relation of the height of the wave to its length. (For examples of waves see figure 1). 3.2 residual curvature Permanent curvature in the direction of rolling of an unwound strip. 3.3 edge camber Greatest distance between a longitudinal edge of the sheet and the line joining the two ends of the measured section corresponding to this edge (see figure 3). 3.4 deviation from the shearing line due to internal stresses Greatest distance between corresponding points on the two cut edges of a sheet cut longitudinally (see figure 4). 3.5 burr height Difference between the thicknesses measured respectively at the cut edge of the sheet and at a distance of 10 mm from this edge (see figure 5). 4 Test methods 4.1 Flatness 4.1.1 Test specimen The test specimen shall consist of a sheet or a length of strip, the size of which is defined in the product standard. 4.1.2 Measuring procedure The test specimen shall be placed on a surface table sufficiently large that the specimen does not overhang the edges. It shall then be lifted up on one edge and allowed to fall back. The height of the maximum wave (h) and the length of the wave (l) shall be measured with a rule graduated in millimetres (see figure 2). 4.2 Residual curvature 4.2.1 Test specimen The test specimen shall consist of a sample 500 mm in length and of width equal to the delivered width of the sheet or strip. The axis of the test specimen shall be parallel to the direction of rolling of the sheet or strip. 4.2.2 Measuring procedure The test shall consist of placing the test specimen vertically against a supporting plate. The top of the test specimen shall be held against the supporting plate over a height of 30 mm with its convex surface facing the plate. The distance (a) between the bottom edge of the test specimen and the supporting plate shall then be measured at the axis of the test specimen (see figure 6). The clamping force shall be sufficient to allow the full width of the test specimen to be in contact with the support. 4.3 Edge camber 4.3.1 Test specimen The test specimen shall consist of a sheet or a length of strip, the size of which is defined in the product standard. 4.3.2 Measuring procedure The test specimen shall be placed on a surface table. A rule shall be placed in contact with the extremities of the concave side and the maximum gap (e) between the edge and the rule shall be measured. 4.4 Deviation from the shearing line due to internal stresses 4.4.1 Test specimen The test specimen shall consist of a sheet or a length of strip, the size of which is defined in the product standard. Page 4 EN 10251 : 1997 BSI 1997 4.4.2 Measuring procedure The test specimen shall be split along the longitudinal axis. The two parts, neither of which shall be turned over, shall be weighted so that they remain flat. The two cut edges shall then be brought together again so as to give the smallest gap. The maximum distance (c) between the two cut edges shall be measured. 4.5 Burr height 4.5.1 Test specimen The test specimen shall consist of a sheet or a length of strip, the size of which is defined in the product standard. The effective length for the measurement shall be 1 m. 4.5.2 Measuring procedure The burr height shall be determined by using a linear measuring device such as a comparator. The device shall have the following characteristics: ± resolution: 1 mm; ± uncertainty:±2 mm; ± axial movement of the sliding anvil shall be obtained without rotation; ± dimension of the sliding anvil: 16 mm 3 8 mm; ± applied force on the sliding anvil: 4 N±0,2 N. The test specimen shall be held flat on a surface table. The linear measuring device shall be rigidly fixed on a stand so that the movement of the anvil is perpendicular to the table (see figure 7). The surface of contact of the sliding anvil shall be parallel to the surface table. The verification of this parallelism can be made using a thickness of the sample. The difference in the distance from any point on the surface of the supporting table shall not exceed 2 mm. A three point adjusting surface table is necessary. The test shall consist of measuring the thickness of the sheet at 10 mm from the cut edge (h1) and the thickness of the cut edge (h2), the sliding anvil having its larger dimension (16 mm) parallel to the cut edge (see figure 8). A measurement shall be made every 50 mm, by moving the test specimen, the burr height being characterized by the mean value of the 20 measurements and by the indication of the maximum value obtained. It is permissible to cut the test specimen, into lengths of at least 50 mm or multiples of 50 mm. If this is done, the cuts shall be made so that the burrs are on the same side of the sheet as the burr which is to be measured. During the measurements, the temperature shall be constant. 5 Test report The test report, when requested, shall contain the following as appropriate: ± reference to this European Standard; ± type and designation of the magnetic steel sheet tested; ± one or more of the following, depending on the requirements of the product standard: 1) length (l) of wave in millimetres, to the nearest 10 mm, height (h) of wave in millimetres, to the nearest 1 mm and wave factor (w) in per cent to the nearest 0,1 %; 2) deviation (a) in millimetres characterizing the residual curvature, to the nearest 1 mm; 3) variation (c) from the shearing line in millimetres, to the nearest 0,1 mm; 4) distance (e) in millimetres characterizing the edge camber, to the nearest 0,1 mm; 5) arithmetic mean value and maximum value of burr height. Page 5 EN 10251 : 1997 BSI 1997 Figure 1. Example of wave Figure 2. Wave factor Figure 3. Verification of the edge camber Page 6 EN 10251 : 1997 BSI 1997 a) Case of a convex gapb) Case of a concave gap Figure 4. Deviation from the shearing line due to internal stresses Figure 5. Burr height (h) Page 7 EN 10251 : 1997 BSI 1997 Figure 6. Measuring device Figure 6 a). Example of clamping system (type A) Page 8 EN 10251 : 1997 BSI 1997 1. Eccentric 2. Side elevation 3. Plan Figure 6 b). Example of clamping system (type B) Page 9 EN 10251 : 1997 BSI 1997 Figure 7. Apparatus for measuring burr height Figure 8. Position of the moving anvil 10blank BSI 1997 BS EN 10251 : 1997 List of references See national foreword. 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