1、BSI Standards PublicationBS EN 847-2:2013Tools for woodworking Safety requirementsPart 2: Requirements for the shank of shankmounted millingBS EN 847-2:2013 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 847-2:2013. Itsupersedes BS EN 847-2:2001 which is withdr
2、awn.The UK participation in its preparation was entrusted to TechnicalCommittee MTE/23, Woodworking machines.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users
3、are responsible for its correctapplication. The British Standards Institution 2013. Published by BSI StandardsLimited 2013ISBN 978 0 580 75761 7ICS 79.120.10Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theS
4、tandards Policy and Strategy Committee on 31 October 2013.Amendments issued since publicationDate Text affectedBS EN 847-2:2013EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 847-2 October 2013 ICS 79.120.10 Supersedes EN 847-2:2001English Version Tools for woodworking - Safety requirements - P
5、art 2: Requirements for the shank of shank mounted milling Outils pour le travail du bois - Prescriptions de scurit - Partie 2: Prescriptions pour les queues des fraise queueMaschinen-Werkzeuge fr Holzbearbeitung - Sicherheitstechnische Anforderungen - Teil 2: Anforderungen fr den Schaft von Frswerk
6、zeugen This European Standard was approved by CEN on 10 August 2013. 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 bibliographic
7、al 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 language made by translation under the responsibility
8、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, Estonia, Finland, Former Yugoslav Republic of M
9、acedonia, 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 FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION
10、EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2013 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 847-2:2013: EBS EN 847-2:2013EN 847-2:2013 (E) 2 Contents Page Foreword 3 Introduc
11、tion .4 1 Scope 5 2 Normative references 5 3 Terms and definitions .5 4 List of significant hazards 6 5 Safety requirements 6 5.1 General requirements for cylindrical shank .6 5.2 Stability of the shank of mounted tools 6 5.3 Stability of HSK mounted tools . 12 6 Tool marking . 14 Annex A (informati
12、ve) Examples of calculation 16 A.1 Example of a calculation of nshank16 A.2 Example of a calculation of nHSK. 17 Annex B (informative) Method of measuring the eccentricity at clamping devices 18 Bibliography . 19 BS EN 847-2:2013EN 847-2:2013 (E) 3 Foreword This document (EN 847-2:2013) has been pre
13、pared by Technical Committee CEN/TC 142 “Woodworking machines - Safety”, the secretariat of which is held by UNI. 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 April 2014, and conflicting nation
14、al standards shall be withdrawn at the latest by April 2014. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes
15、EN 847-2:2001. The following table contains a list of modifications from the previous edition. EN 847-2:2001 EN 847-2:2013 Reason 1 Scope 1 Scope: Precision of the indent New paragraph: applies also for shank tools with a cutting diameter of less than 16 mm ed/te 3 Quantities and units 3 Terms and d
16、efinitions ed 5 Tool marking 5 Safety requirements: 5.1 General requirements for cylindrical shank 5.2 Stability of the shank of the shank mounted tools 5.3 Stability of HSK mounted tools te (missing requirements) 6 Safety requirements 6 Tool marking Changed symbol for the free shank length te Annex
17、 A: Method of measuring the eccentricity at clamping devices Annex A: Examples of calculation ed Annex B: Example of calculation Annex B: Method of measuring the eccentricity at clamping devices ed New: Bibliography ed According to the CEN-CENELEC Internal Regulations, the national standards organis
18、ations of the following countries are bound to implement this European 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, Ma
19、lta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 847-2:2013EN 847-2:2013 (E) 4 Introduction The content of this European Standard is aimed at eliminating hazards which can lead to overloading of the shank of sha
20、nk mounted milling tools for woodworking by excessive rotational speeds. BS EN 847-2:2013EN 847-2:2013 (E) 5 1 Scope This European Standard specifies the determination of the maximum speed for given eccentricity at clamping devices for the shank strength of milling tools with cylindrical and taper s
21、hank. It also specifies the marking of the tool. Bore mounted tools which are mounted on an arbour should be considered as a shank mounted tool. This European Standard complements EN 847-1 and applies also for shank tools with a cutting diameter of less than 16 mm. 2 Normative references The followi
22、ng documents, in whole or in part, are normatively referenced in this document and are indispensable 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. EN 847-1:2013, Too
23、ls for woodworking Safety requirements Part 1: Milling tools, circular saw blades EN ISO 12100:2010, Safety of machinery General principles for design Risk assessment and risk reduction (ISO 12100:2010) ISO 1940-1, Mechanical vibration Balance quality requirements for rotors in a constant (rigid) st
24、ate Part 1: Specification and verification of balance tolerances 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 847-1:2013 and the following apply. 3.1 7/24 shank SK type of toolholder with a 7/24 cone ratio taper that contacts the spindle on two sur
25、faces Note 1 to entry: Toolholder with a 7/24 cone ratio taper; see Bibliography. 3.2 hollow taper shank HSK type of toolholder with a short hollow taper with a high positioning accuracy and high grade of rigidity that contacts the spindle on two surfaces Note 1 to entry: Toolholder with 1:1,09 cone
26、 ratio hollow taper shank; see Bibliography. 3.3 arbour device to mount in or on the spindle of a machine tool, and which is designed to carry and drive a bore type cutting tool BS EN 847-2:2013EN 847-2:2013 (E) 6 4 List of significant hazards Table 1 shows the list of significant hazards. Table 1 L
27、ist of significant hazards Hazard according to EN ISO 12100:2010 Condition or causes of hazard related to the tool Corresponding clause of EN 847-2 Mechanical hazards due to: Inadequacy of mechanical strength Breaking of the tool 5 Vibration Dynamic unbalance of tool 5 Variations in the rotational s
28、peed of tools Breaking of the tool 5 5 Safety requirements 5.1 General requirements for cylindrical shank The minimum value for the clamping length le minshall be as given in Table 2. Table 2 Minimum clamping length le min d2 10 mm 10 mm 50mm) NOTE 1 Clamping systems: with axial clamping force Fa d
29、= d4; without axial clamping force Fa d = darbour. BS EN 847-2:2013EN 847-2:2013 (E) 7 a) b) Figure 1 Quantities for calculation of nshank (1 of 2) BS EN 847-2:2013EN 847-2:2013 (E) 8 c) Key a axis of rotation Figure 1 Quantities for calculation of nshank (2 of 2) For balance quality, see EN 847-1:2
30、013, Table 5. For calculation of n with a given espthe following formula applies: IEWeIElWelmWGGfn3s2w+ sp1063s2w+ sps*w+ 2+ S30= shankl(1) BS EN 847-2:2013EN 847-2:2013 (E) 9 For calculation of espwith a given n the following formula applies: IElWGnmWfne3s2w30106s*wS3021= spl(2) shankpernGe=30(3) T
31、he mass mcutof the tool components related to the centre of gravity S in the area of l0+ l1, is given in Figure 1. m* = f mcut(4) f = 0,04 + 0,17 ln (mcut) (5) This is an empiric formula of which the result is only valid between 0,6 and 0,9. If the result is less than 0,6 use 0,6, and if the result
32、is greater than 0,9 use 0,9. The form factor takes into account the deviation of the actual form (e.g. gullet; flattening) from the solid body form of the tool without shank. NOTE 2 The expression “In (mcut)“ is the natural logarithm of mass of the tool without shank. 644dI = (6) l0= lg le (7) If kn
33、own the real mass can be used in place of the reduced mass. 323dW = (8) EXAMPLE Figure 2 and Formula (9) give an example for the calculation of the distance ls. BS EN 847-2:2013EN 847-2:2013 (E) 10 Figure 2 Distances of the gravity centres of the tool components 43214,S43,S32,S21,S1Smmmmlmlmlmlml+=(
34、9) BS EN 847-2:2013EN 847-2:2013 (E) 11 Table 3 Stability of the shank of the shank mounted tools Quantities and units Quantity Description Unit d diameter a) shank diameter d2b) cone diameter d3c) with axial force d4: calculated; without axial force: darbourmm d1tool diameter mm d2shank diameter, s
35、ee Figure 1a) mm d3cone diameter, see Figure 1b) mm d4calculated hub diameter, see Figure 1c) mm darbourshank diameter of the arbour, see Figure 1c) mm E modulus of elasticity N mm 2eperpermissible gravity centre displacement mm especcentricity at clamping device amm f form factor fssafety factor (f
36、S = 4) ./. Faaxial clamping force, see Figure 1c) N G product of the permissible eccentricity and the angular velocity according to ISO 1940-1 mm s 1I second moment of area mm4l1height of tool components mm l0free shank length mm lsdistance of gravity centre measured from the end of the clamping dev
37、ice mm leclamping length mm lgtotal length of shank mm mcutmass of the tool components related to the centre of gravity S in the area of l0+ l1, see Figure 1a) to Figure 1c) m* reduced mass of the tool g n operational speed min1nshankmaximum permissible rotational speed with regard to shank strength
38、 min 1S centre of gravity W section modulus mm3wfatigue strength under reversed bending stresses of shank material N mm 2 density of shank material g mm 3aIt is intended to determine mean values for stationary routing machines and hand held routing machines by concluding serial tests in order to pro
39、vide the designer with safety indications and to reduce hazards. For general use nshankshall be calculated for esp= 0,1 mm and for tools used on NC- and CNC-machines nshankshall be calculated for esp= 0,06. In other cases the value of espshall be taken according to the formula. BS EN 847-2:2013EN 84
40、7-2:2013 (E) 12 NOTE 3 The safety requirements for the shank strength are fulfilled when, using the given tool sizes and material characteristics with defined free shank length l0, gravity centre displacement eperand eccentricity at clamping device esp, the maximum permissible rotational speed for t
41、he shank nshankis not exceeded during operation. The cutting force is not significant in comparison with the centrifugal force. Therefore, the cutting force has not been taken into account. For the operation of complex shank mounted milling tools it has to be considered that the maximum permissible
42、operational speed may not exceed the lower value of the two maximum speed values for the shank strength (nshank) as well as the strength to overspeed load (nmax) in accordance with EN 847-1:2013, 5.1.4.1. 5.3 Stability of HSK mounted tools Figure 3 Quantities for calculation of nHSK If more than one
43、 tool is mounted on an HSK-arbour the tool with the highest value FC x lC should be used for the calculation of nHSK. For calculation of nHSKthe following formula applies: sSlemlFdFfn=ccHSKHSK3HSK21030(10) e = eHSK+ eM+ eT (11) rHSKpsHSK)(2tdtle += (12) BS EN 847-2:2013EN 847-2:2013 (E) 13 2minmaxbM
44、sdDe= (13) maxTT30nGGe=(14) If Fcis unknown, Fccan be calculated according to EN 847-1: Fc= Fm b1Fm= 50 N/mm (for tools with a cutting radius r1 20 mm) 610max1130mMot=nbrPF(for tools with a cutting radius r1 20 mm) (15) Alternative Fccan be calculated as transmissible force according to the spindle
45、power: 6max1Motccc1030=nrPvPF(16) BS EN 847-2:2013EN 847-2:2013 (E) 14 Table 4 Stability of HSK mounted tools Quantity and units Quantity Description Unit C resulting working point of the cutting forces reduced to the tool axis ./. b1cutting width according to EN 847-1 mm Db maxmaximum bore diameter
46、 (e.g. tool bore) mm dHSKnominal diameter of the HSK (e.g. HSK-F63: dHSK= 63 mm) mm ds minminimum shaft diameter (e.g. arbour) mm e gravity centre displacement of the complete tool (worst case) mm eHSKeccentricity of the tool caused by the tolerances of the HSK mm eMeccentricity of the tool caused b
47、y mounting tolerances between bore and arbour mm eTgravity centre displacement of the mounted tool caused by unbalancing mm Fccutting force N Fmspecific cutting force N/mm FHSKclamping force of the HSK (guideline values are given in DIN 69893) N fSsafety factor (fS= 4) ./. G product of the permissib
48、le eccentricity and the angular velocity according to ISO 1940-1 mm s-1lcaxial distance of the working point of the cutting force from the face stop of the HSK mm lsdistance of the gravity centre from the face stop of the HSK mm m total mass of the complete tool (individual tools, arbour, spacers, H
49、SK) g nHSKmaximum permissible rotational speed of the HSK interface min-1nmaxmaximum rotational speed of the tool according to EN 847-1 min-1R1cutting radius according to EN 847-1 mm S centre of gravity ./. tpplanarity tolerance of the face stop of the HSK according to DIN 69893 mm trrun-out tolerance of the HSK according to DIN 69893 mm P working point of the insertion force on the HSK ./. Pccutting power kW
