08-30189270-DC.pdf

a Date: 18 November 2008 Origin: European Latest date for receipt of comments: 28 February 2009 Project no.: 2008/02868 Responsible committee: MTE/13 Grinding wheels, abrasive tools, paper and cloths, and powders Interested committees: Title: Draft BS EN 13236 Safety requirements for superabrasive products Supersession information: If this document is published as a standard, the UK implementation of it will supersede BSEN13236 : 2001 and partially supersede. NONE If you are aware of a current national standard which may be affected, please notify the secretary (contact details below). WARNING: THIS IS A DRAFT AND MUST NOT BE REGARDED OR USED AS A BRITISH STANDARD. THIS DRAFT IS NOT CURRENT BEYOND 28 February 2009. This draft is issued to allow comments from interested parties; all comments will be given consideration prior to publication. No acknowledgement will normally be sent. See overleaf for information on commenting. No copying is allowed, in any form, without prior written permission from BSI except as permitted under the Copyright, Designs and Patent Act 1988 or for circulation within a nominating organization for briefing purposes. Electronic circulation is limited to dissemination by e-mail within such an organization by committee members. Further copies of this draft may be purchased from BSI Customer Services, Tel: +44(0) 20 8996 9001 or email cservicesbsigroup.com. British, International and foreign standards are also available from BSI Customer Services. Information on the co-operating organizations represented on the committees referenced above may be obtained from the responsible committee secretary. Cross-references The British Standards which implement International or European publications referred to in this draft may be found via the British Standards Online Service on the BSI web site http:/www.bsigroup.com. Direct tel: 020 8996 7009 Responsible Committee Secretary: Committee Service Centre (BSI) E-mail: cscbsigroup.com Draft for Public Comment Head Office 389 Chiswick High Road London W4 4AL Telephone: +44(0)20 8996 9000 Fax: +44(0)20 8996 7001 Form 36 Version 8.0 DPC: 08/30189270 DC Licensed Copy: London South Bank University, South Bank University, 31/01/2009 04:04, Uncontrolled Copy, (c) BSI b Introduction This draft standard is based on European discussions in which the UK has taken an active part. Your comments on this draft are welcome and will assist in the preparation of the consequent British Standard. Comment is particularly welcome on national, legislative or similar deviations that may be necessary. Even if this draft standard is not approved by the UK, if it receives the necessary support in Europe, the UK will be obliged to publish the official English Language text unchanged as a British Standard and to withdraw any conflicting standard. 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Further information on submitting comments and how to obtain a blank electronic version of a comment form are available from the BSI web site at: http:/www.bsigroup.com/en/Standards-and-Publications/Current-work/DPCs/ Template for comments and secretariat observations Date: xx/xx/200x Document: ISO/DIS xxxxx 1 2 (3) 4 5 (6) (7) MB Clause No./ Subclause No./ Annex (e.g. 3.1) Paragraph/ Figure/Table/ Note (e.g. Table 1) Type of com- ment Comment (justification for change) by the MB Proposed change by the MB Secretariat observations on each comment submitted 3.1 Definition 1 ed Definition is ambiguous and needs clarifying. Amend to read . so that the mains connector to which no connection . 6.4 Paragraph 2 te The use of the UV photometer as an alternative cannot be supported as serious problems have been encountered in its use in the UK. Delete reference to UV photometer. Microsoft and MS-DOS are registered trademarks, and Windows is a trademark of Microsoft Corporation. Licensed Copy: London South Bank University, South Bank University, 31/01/2009 04:04, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM DRAFT prEN 13236 November 2008 ICS 25.100.70Will supersede EN 13236:2001 English Version Safety requirements for superabrasive products Prescriptions de sécurité pour les produits superabrasifsSicherheitsanforderungen für Schleifwerkzeuge mit Diamant oder Bornitrid This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee CEN/TC 143. If this draft becomes a European Standard, 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. This draft European Standard was established by CEN 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 CEN Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to provide supporting documentation. Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and shall not be referred to as a European Standard. EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels © 2008 CENAll rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. prEN 13236:2008: E Licensed Copy: London South Bank University, South Bank University, 31/01/2009 04:04, Uncontrolled Copy, (c) BSI prEN 13236:2008 (E) 2 Contents Page Foreword4 Introduction.4 1 Scope 5 2 Normative references5 3 Terms, definitions and symbols.5 3.1 General5 3.2 Grinding machines 5 3.3 Grinding method6 3.4 Type of application6 3.5 Symbols8 3.6 Other symbols9 4 List of significant hazards 9 5 Safety requirements 9 5.1 General requirements9 5.2 Requirements for precision superabrasive grinding and cutting-off wheels .9 5.3 Requirements for non-precision cutting-off wheels11 5.4 Requirements for diamond wires.17 5.5 Requirements for mounted points.18 5.6 Requirements for other superabrasive products for non-precision grinding.18 5.7 Marking.19 6 Verification of the safety requirements.19 6.1 Verification of the general requirements.19 6.2 Verification of the strength requirements.20 6.3 Verification of marking25 6.4 Verification of the requirements for blotters 25 7 Information for use25 Annex A (normative) Marking 27 A.1 Content of the marking .27 A.2 Execution of the marking30 Annex B (normative) Colour codes.31 Annex C (informative) Mounted points .32 C.1 Example calculation of the maximum permissible speed of rotation32 C.2 Example for the application of the calculation method.35 Annex D (normative) Reconditioning of cutting-off wheels according to 5.3.6.4 38 D.1 Preconditions for reconditioning.38 D.2 Additional marking requirements 39 Annex E (informative) Speed conversion table40 Bibliography43 Figures Figure 1 Position of cuts and openings in steel blanks.15 Figure 2 Dimensions of the segment height X1.20 Figure 3 Example of a bending test device for segmented cutting-off wheels .21 Figure 4 Dimensions of height of superabrasive section X1.22 Figure 5 Example of a bending test device for cutting-off wheels with continuous rim22 Figure 6 Example of a shearing force test device 23 Figure 7 Example of the test piece.25 Licensed Copy: London South Bank University, South Bank University, 31/01/2009 04:04, Uncontrolled Copy, (c) BSI prEN 13236:2008 (E) 3 Figure 8 Example of a tensile test25 Figure C.1 Volume division for mounted points with reduced spindle (ZYA) .33 Tables Table 1 Grinding method, type of machine, type of application.7 Table 2 Symbols.8 Table 3 Other symbols.9 Table 4 List of significant hazards .9 Table 5 Safety factors for precision superabrasive grinding and cutting-off wheels 10 Table 6 Maximum operating speeds as a function of the bond type11 Table 7 Safety factors for non-precision cutting-off wheels.12 Table 8 Maximum operating speeds as a function of the bond type12 Table 9 Dimensions of blanks for dry cutting-off.13 Table 10 Dimensions of blanks for wet cutting-off.14 Table 11 Bending strength requirements values b for cutting-off wheels for the use on hand-held cutting-off machines depending on segment height X1, segment length L2 and thickness E of the core.16 Table 12 Safety factors for other superabrasive products for non-precision grinding18 Table A.1 Marking of superabrasive products27 Table A.2 Restrictions of use (RE) .29 Table B.1 Colour codes and design of colour codes.31 Table C.1 Designation of the calculation quantities.34 Table C.2 Designation of mounted points.35 Table C.3 Characteristics for the calculation of maximum speeds of rotation.35 Table C.4 Mounted points, cylindrical shape, plain spindles (ZYN) vitrified bond (V) .36 Table C.5 Mounted points, cylindrical shape, reduced spindles (ZYA), vitrified bond (V).36 Table C.6 Mounted points, cylindrical shape, plain spindle Schaft (ZYN), electroplated bond (G) 37 Table E.1 Speed conversion .40 Licensed Copy: London South Bank University, South Bank University, 31/01/2009 04:04, Uncontrolled Copy, (c) BSI prEN 13236:2008 (E) 4 Foreword This document (prEN 13236:2008) has been prepared by Technical Committee CEN/TC 143 “Machine tools - Safety”, the secretariat of which is held by SNV. This document is currently submitted to the CEN Enquiry. This document will supersede EN 13326:2001. The provisions of this European standard shall not apply to superabrasive products manufactured the first 12 month after publication of this European standard. Significant changes against EN 13236:2001 are as follows: a) The Standard was technically and editorially revised and partly adapted to EN 12413:2007 about bonded abrasive products and EN 13743 about coated abrasive products; b) The term “burst speed factor“ was included in Table 2, Table 5, Table 7 and Table 11; c) in the requirements it is now distinguished between precision and non-precision cutting-off wheels; d) requirements for reconditioned non-precision cutting-off wheels were included in new 5.3.7.4 and new normative Annex D; e) Clause 6 was shortened to verification of safety requirements. The internal tests to be carried out by the manufacturer were deleted; f) the requirements for colour code stripes were deleted in Annex A and are now presented in new Annex B; g) Table A.2 and Table A.3 about restrictions for use were combined to one table and thereby adapted to EN 12413 and EN 13743; h) A.2 about execution of the marking was simplified; i) Annex B about blotters was deleted and part of its content was included in 5.2.5; j) Annex C about mounted points was completely revised and shortened; k) Annex D with the speed conversion table (now Annex E) was editorially revised and peripheral speeds above 320 m/s were deleted. l) Annex E about shapes and dimensions of grinding wheels and cutting-off wheels had become obsolete with publication of ISO 6104 and was therefore deleted. m) Annex F about grain sizes and concentration for diamond and cubic boron nitride had become obsolete with publication of ISO 6106 and was therefore deleted. Introduction This European Standard has been prepared to provide one means of conforming with essential safety requirements, e.g. of the General Product Safety Directive and associated EFTA regulations. This European Standard is addressed to designers, manufacturers and suppliers of the superabrasive products described in the scope as well as to those who are reconditioning superabrasive cutting-off wheels. In addition, it helps designers, manufacturers and suppliers of grinding machines in the selection of superabrasive products, in Licensed Copy: London South Bank University, South Bank University, 31/01/2009 04:04, Uncontrolled Copy, (c) BSI prEN 13236:2008 (E) 5 order to reduce the risks and achieve conformity of the respective machinery with the Essential Safety Requirements of the Machinery Directive. The extent to which hazards are covered is indicated in the scope of this European Standard. 1 Scope This European Standard is applicable to the following superabrasive products: precision superabrasive grinding and cutting-off wheels, non-precision cutting-off wheels, diamond wires, mounted points and other superabrasive products for non-precision grinding. It also applies to reconditioned superabrasive cutting-off wheels. This European Standard specifies requirements and/or measures for the removal or reduction of hazards resulting from the design and application of the superabrasive products. This European Standard contains also procedures and tests for verification of the compliance with the requirements as well as safety information for use which is to be made available to the user by the manufacturer. The hazards taken into consideration are listed in Clause 4. This European Standard does not apply to bonded abrasive products, coated abrasive products, rotating dressing tools, truers nor any non-rotating superabrasive products. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 286-2, ISO system of limits and fits Part 2: Tables of standards tolerances grades and limit deviations for holes and shafts. 3 Terms, definitions and symbols For the purpose of this document the following terms and definitions apply. 3.1 General 3.1.1 superabras