1、BSI Standards PublicationBS EN ISO 6103:2014Bonded abrasive products Permissible unbalances ofgrinding wheels as delivered Static testingBS EN ISO 6103:2014 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN ISO 6103:2014.It supersedes BS EN ISO 6103:2005 which is
2、withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee MTE/13, Grinding wheels, abrasive tools, paper andcloths, and powders.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include al
3、l the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2014. Published by BSI StandardsLimited 2014ISBN 978 0 580 81076 3ICS 25.100.70Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Sta
4、ndard was published under the authority of theStandards Policy and Strategy Committee on 31 October 2014.Amendments issued since publicationDate Text affectedEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 6103 October 2014 ICS 25.100.70 Supersedes EN ISO 6103:2005English Version Bonded abr
5、asive products - Permissible unbalances of grinding wheels as delivered - Static testing (ISO 6103:2014) Produits abrasifs agglomrs - Balourds admissibles des meules en tat de livraison - Contrle statique (ISO 6103:2014) Schleifkrper aus gebundenem Schleifmittel - Zulssige Unwucht von Schleifscheibe
6、n im Lieferzustand - Statische Prfung (ISO 6103:2014) This European Standard was approved by CEN on 6 September 2014. 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 a
7、ny 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). A version in any other langu
8、age 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, Cyprus, Czech Republic, Denmark
9、, 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 Kingdom. EUROPEAN COMMITTEE FO
10、R STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2014 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 6103:2014 EBS EN ISO 6103:201
11、4EN ISO 6103:2014 (E) 3 Foreword This document (EN ISO 6103:2014) has been prepared by Technical Committee ISO/TC 29 “Small tools“ in collaboration with Technical Committee CEN/TC 143 “Machine tools - Safety” the secretariat of which is held by SNV. This European Standard shall be given the status o
12、f a national standard, either by publication of an identical text or by endorsement, at the latest by April 2015, and conflicting national standards shall be withdrawn at the latest by April 2015. Attention is drawn to the possibility that some of the elements of this document may be the subject of
13、patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN ISO 6103:2005. According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this Eur
14、opean 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, Slovakia, Sl
15、ovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Endorsement notice The text of ISO 6103:2014 has been approved by CEN as EN ISO 6103:2014 without any modification. BS EN ISO 6103:2014ISO 6103:2014(E) ISO 2014 All rights reserved iiiContents PageForeword iv1 Scope . 12 Terms and de
16、finitions . 13 Permissible unbalance, Ua34 Measuring intrinsic unbalance 35 Checking intrinsic unbalance 45.1 Verification and acceptance . 45.2 Determination of ma45.3 Acceptance testing of the grinding wheel 5Bibliography 7BS EN ISO 6103:2014ISO 6103:2014(E)ForewordISO (the International Organizat
17、ion for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established h
18、as the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.The
19、procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the edi
20、torial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent rig
21、hts identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents).Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement.For an expl
22、anation on the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the WTO principles in the Technical Barriers to Trade (TBT) see the following URL: Foreword - Supplementary informationThe committee responsible for this docu
23、ment is ISO/TC 29, Small tools, Subcommittee SC 5, Grinding wheels and abrasives.This fourth edition cancels and replaces the third edition (ISO 6103:2005), which has been technically revised to introduce the following significant changes:a) the scope has been amended with respect to minimum outside
24、 diameters;b) the normative references to ISO 603 series have been deleted;c) types of bonded abrasive products for hand-held grinding machines in Table 1 have been amended;d) diameter ranges in Table 1 have been corrected;e) a bibliography has been added.iv ISO 2014 All rights reservedBS EN ISO 610
25、3:2014INTERNATIONAL STANDARD ISO 6103:2014(E)Bonded abrasive products Permissible unbalances of grinding wheels as delivered Static testing1 ScopeThis International Standard specifies the maximum permissible values of unbalances for bonded abrasive wheels with an outside diameter D 125 mm and maximu
26、m operating speed vs 16 m/s, in the as-delivered condition.It also specifies the method for measuring the unbalance and the practical method for testing whether a grinding wheel is acceptable or not.This International Standard is applicable to bonded abrasive wheels in the as-delivered condition.Thi
27、s International Standard is not applicable to diamond, cubic boron nitride or natural stone grinding wheels, or centreless control wheels, lapping and disc wheels, ball wheels or glass grinding wheels.NOTE 1 The values given refer to the grinding wheel itself, independent of any unbalance which may
28、exist in the balancing arbor or in the means of fastening it to this arbor. These various elements, together with the flanges or hub-flanges, are assumed to be balanced, homogeneous and free from geometrical defects.NOTE 2 The effects of unbalance are basically additional stresses on the arbor, the
29、machine and its mounting, excessive wear of the bearings, vibration prejudicial to the quality of machining and increased internal stresses in the grinding wheel, and increased operator fatigue.2 Terms and definitionsFor the purposes of this document, the following terms and definitions apply.2.1unb
30、alanceproduct of radius and massNote 1 to entry: Radius is expressed in millimetres. Mass is expressed in grams. The product of radius and mass is expressed in grams multiplied by millimetres.2.2intrinsic unbalance of a grinding wheelUiproduct of the mass m1of the grinding wheel and the distance e b
31、etween its centre of mass G (centre of gravity) and the axis O of its boreNote 1 to entry: See Figure 1. ISO 2014 All rights reserved 1BS EN ISO 6103:2014ISO 6103:2014(E)Figure 1 Intrinsic unbalance of a grinding wheel2.3measured unbalanceUcproduct of a mass m2, affixed to the grinding wheel to bala
32、nce it and the distance between the centre of mass (Gm2) (centre of gravity) of the mass m2and the axis O of the grinding wheel boreNote 1 to entry: See Figure 2.Note 2 to entry: In practice, this distance is equal to the radius r of the grinding wheel.Key1 mass m2Figure 2 Measured unbalance2 ISO 20
33、14 All rights reservedBS EN ISO 6103:2014ISO 6103:2014(E)3 Permissible unbalance, UaOn the basis of experience, the maximum permissible unbalance Uais determined using a mass ma= Ua/r, such thatmkma=1(1)wherer is the radius of the grinding wheels, in millimetres;mais the mass whose centre is located
34、 on the circumference of the grinding wheel, in grams;m1is the mass of the grinding wheel, in grams;k is a coefficient which depends on the nature and usage of the grinding wheel.The values of k are given in Table 1 and the values of ma, as a function of m1and k, are shown in Figure 5.The values of
35、k have been selected on the basis of experience so that the resulting unbalance allows for normal usage of the grinding wheel.4 Measuring intrinsic unbalancePlace a balancing arbor through the bore of the grinding wheel to hold its mid-plane in a vertical position. For straight wheels or wheels of s
36、imilar shape, the wheel is free-standing; wheels of other shapes may be supported using suitable flanges.Rest the balancing arbor on two parallel horizontal bevelled guide-bars or cylindrical bars (see Figure 3), or on a balancing stand consisting of two pairs of overlapping, freely rotating, steel
37、discs (see Figure 4), so that the grinding wheel attains an equilibrium position with minimum friction.Alternative: The two bevelled guide-bars may be replaced by two cylindrical bars.Figure 3 Balancing arbor on guide bars ISO 2014 All rights reserved 3BS EN ISO 6103:2014ISO 6103:2014(E)Figure 4 Bal
38、ancing arbor on steel discsThe clearance between the balancing arbor and the bore of the grinding wheel shall not exceed 0,4 mm.The arbor and the supports (guide-bars, bars or discs) shall have an adequate surface hardness and an appropriate surface condition to minimize friction.When the grinding w
39、heel attains the equilibrium position, its centre of mass is then as low as possible. In this position, mark the upper peripheral point of the grinding wheel.Rotate the grinding wheel through 90 to bring this mark into the horizontal plane for the arbor axis.Determine the mass m2which, when affixed
40、to the periphery of the grinding wheel at the mark, maintains the grinding wheel in equilibrium. The amount of unbalance thus introduced, Uc= m2 r, is equal and opposite to the intrinsic unbalance of the wheel.The value of the mass m2is used to determine the intrinsic unbalance of the wheel using Fo
41、rmula (2):UUmric2= (2)5 Checking intrinsic unbalance5.1 Verification and acceptanceVerify the intrinsic unbalance according to the method specified in Clause 4.A grinding wheel is only acceptable if its intrinsic unbalance Uiis less than or equal to the permissible unbalance Ua, i.e.Ui Ua(3)The test
42、ing is done with a massmUraa= (4)5.2 Determination of maFrom Table 1, determine the coefficient k by reading off the value according to the various parameters related to the grinding wheel and its application.Figure 5 then gives the values of the mass ma, in grams, as a function of the mass m1of the
43、 wheel, in grams, and the coefficient k.4 ISO 2014 All rights reservedBS EN ISO 6103:2014ISO 6103:2014(E)5.3 Acceptance testing of the grinding wheelWith the grinding wheel mounted in accordance with Clause 4, place a mass maas determined in 5.2 on the periphery of the grinding wheel at the mark. If
44、 the wheel remains stationary or rotates so that the mark is at the bottom, the grinding wheel is accepted; otherwise, it is rejected.Table 1 Values of the coefficient k for bonded abrasive productsGrinding methodType of machineType of bonded abrasive productDimensions Coefficient k for maximum oper
45、ating speed vsD Tmm mm m/s16 vs 40 40 180T 6 0,40 0,32 0,20T 6 0,32 0,25 0,20Types 6 and 11all dimensions 0,40 0,32 Grinding (deburring, fettling and snagging)Stationary grinding machines, swing frame grinding machines and other grinding machinesTypes 1/2/35 and 36all dimensions 0,63 0,50 0,40High-p
46、res-sure grindingStationary grinding machinesType 1 all dimensions 0,8Grinding precisiongrinding externalcylindrical grinding surfacegrinding sharpeningStationary grinding machinesall types125 D 300all dimen-sions0,25 0,20 0,16300 610 0,40 0,32 0,25Cutting-offHand-held cutting-off machinesTypes 41 a
47、nd 42125 D 406 0,40 0,32 0,20Stationary cutting-off machinesType 41 and 42D 300 0,50 0,40 0,32D 300 0,63 0,50 0,40 ISO 2014 All rights reserved 5BS EN ISO 6103:2014ISO 6103:2014(E)KeyY value of ma, in gramsX mass of the wheel m1, in gramsaSee example.EXAMPLE For a straight grinding wheel for precisi
48、on grinding, of outside diameter D = 762 mm and mass m1= 68 000 g used on a stationary machine at a maximum operating speed vs= 60 m/s, the coefficient k = 0,32 (see Table 1) and the maximum permissible mass ma= 83 gFigure 5 Values of the mass maas a function of the mass of the wheel m1and the coeff
49、icient k6 ISO 2014 All rights reservedBS EN ISO 6103:2014ISO 6103:2014(E)Bibliography1 ISO 603-1, Bonded abrasive products Dimensions Part 1: Grinding wheels for external cylindrical grinding between centres2 ISO 603-2, Bonded abrasive products Dimensions Part 2: Grinding wheels for centreless external cylindrical grinding3 ISO 603-3, Bonded abrasive products Dimensions Part 3: Grinding wheels for internal cylindrical grinding4 ISO 603-4, Bonded abrasive products Dim
