1、Tools for woodworking - Safety requirementsPart 2: Requirements for the shank of shank mounted milling tools/circular saw bladesBS EN 8472:2017BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 847-2 November 2017 ICS
2、 79.120.10 Supersedes EN 847-2:2013English Version Tools for woodworking - Safety requirements - Part 2: Requirements for the shank of shank mounted milling tools/circular saw blades Outils pour le travail du bois - Prescriptions de scurit - Partie 2 : Prescriptions pour les queues des fraises queue
3、 Maschinen-Werkzeuge fr Holzbearbeitung - Sicherheitstechnische Anforderungen - Teil 2: Anforderungen fr den Schaft von Frswerkzeugen/Kreissgebltter This European Standard was approved by CEN on 21 August 2017. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate
4、 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 CEN-CENELEC Management Centre or to any CEN member. This European Stand
5、ard 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 CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the nati
6、onal standards bodies of 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, Ser
7、bia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2017 CEN All rights of exploitation in any form and by
8、 any means reserved worldwide for CEN national Members. Ref. No. EN 847-2:2017 ENational forewordThis British Standard is the UK implementation of EN 8472:2017. It supersedes BS EN 8472:2013, which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee MTE/23, Wood
9、working machines.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2017 Publis
10、hed by BSI Standards Limited 2017ISBN 978 0 580 94051 4ICS 79.120.10Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 November 2017.Amendments/corrigenda issued
11、 since publicationDate Text affectedBRITISH STANDARDBS EN 8472:2017EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 847-2 November 2017 ICS 79.120.10 Supersedes EN 847-2:2013English Version Tools for woodworking - Safety requirements - Part 2: Requirements for the shank of shank mounted milling
12、tools/circular saw blades Outils pour le travail du bois - Prescriptions de scurit - Partie 2 : Prescriptions pour les queues des fraises queue Maschinen-Werkzeuge fr Holzbearbeitung - Sicherheitstechnische Anforderungen - Teil 2: Anforderungen fr den Schaft von Frswerkzeugen/Kreissgebltter This Eur
13、opean Standard was approved by CEN on 21 August 2017. 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 c
14、oncerning 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 of a CEN member
15、 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 Macedonia, Franc
16、e, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPIS
17、CHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2017 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 847-2:2017 EBS EN 8472:2017EN 847-2:2017 (E) 2 Contents Page European foreword . 3 Introd
18、uction 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 shank mounted tools . 7 5.3 Stability of HSK mounted tools 13 6 Marking of tools with cyl
19、indrical shank 15 Annex A (informative) Examples of calculation . 17 A.1 Example of calculation of nshank. 17 A.2 Examples of calculations of nHSK18 Annex B (normative) Method of measuring the eccentricity at clamping devices 19 Annex C (informative) Recommended minimum clamping forces . 20 Bibliogr
20、aphy . 21 BS EN 8472:2017EN 847-2:2017 (E) 3 European foreword This document (EN 847-2:2017) has been prepared 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 b
21、y publication of an identical text or by endorsement, at the latest by May 2018, and conflicting national standards shall be withdrawn at the latest by May 2018. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN shall not be hel
22、d responsible for identifying any or all such patent rights. This document supersedes EN 847-2:2013. According to the CEN-CENELEC Internal Regulations, the national standards organisations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia,
23、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, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey an
24、d the United Kingdom. BS EN 8472:2017EN 847-2:2017 (E) 4 Introduction The content of this European Standard is aimed at eliminating hazards which can lead to overloading of the shank of shank mounted milling tools for woodworking by excessive rotational speeds. BS EN 8472:2017EN 847-2:2017 (E) 5 1 S
25、cope 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 shank. It also specifies the marking of the tool. Bore mounted tools e.g. milling tools, circular saw blades whic
26、h are mounted on an arbor should be considered as a shank mounted tool. This European Standard complements EN 847-1:2017 and applies also for shank tools with a cutting diameter of less than 16 mm. This European Standard is not applicable for shanks of tools according to this scope, which are manufa
27、ctured before the date of its publication. 2 Normative references The following 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 t
28、he referenced document (including any amendments) applies. EN 847-1:2017, Tools 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) 3 Terms and definiti
29、ons For the purposes of this document, the terms and definitions given in EN 847-1:2017 and the following apply. 3.1 7/24 shank SK type of tool holder with a 7/24 cone ratio taper 3.2 hollow taper shank HSK type of tool holder with a short hollow taper with high positioning accuracy and high grade o
30、f rigidity that contacts the spindle on two surfaces 3.3 arbor device to be mounted on the machine spindle interface and which is designed to carry bore type cutting tools BS EN 8472:2017EN 847-2:2017 (E) 6 4 List of significant hazards Table 1 shows the list of significant hazards. Table 1 List of
31、significant hazards Hazard according to EN ISO 12100:2010 Condition or causes of hazard related to the tool Corresponding clause of EN 8472 Mechanical hazards due to: Inadequacy of mechanical strength Breaking of the tool 5 Vibration Dynamic unbalance of tool 5 Variations in the rotational speed of
32、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 mind2 10 mm 10 mm 50mm) BS EN 8472:2017EN 847-2:2017 (E) 13 NOTE For clamping systems - w
33、ith axial clamping force Fa: d = d4 (see Formula (2) and 3) - without axial clamping force Fa: d = darbor (see Formula (2) and 3) 5.3 Stability of HSK mounted tools For descriptions of symbols for stability of HSK mounted tools, see Table 4 Table 4 Stability of HSK mounted tools Symbols and units Sy
34、mbol Description Unit C1, C2, . resulting working point of the cutting forces reduced to the tool axis b1cutting width according to EN 8471:2017 mm dHSKnominal diameter of the HSK (e.g. HSK-F63: dHSK= 63 mm) mm e gravity centre displacement of the tool set (worst case) mm eHSKeccentricity of the too
35、l caused by the tolerances of the HSK mm eTSexpectable gravity centre displacement of the tool set caused by unbalance mm FC1, FC2. cutting force N Fmspecific cutting force N/mm FHSKclamping force of the HSK (guideline values are given in Annex C) N Fscentrifugal force caused by unbalance N fGlifeti
36、me degradation factor of balance quality grade (fG= 2,5) frfriction factor (fr= 0,7) fssafety factor (fs= 4) G balance quality grade of the tool set (individual tools, arbor, spacers, HSK): product of the permissible eccentricity and the angular velocity according to EN 8471:2017 mm s1lC1, lC2, . ax
37、ial distance of the working point of the cutting force from the face stop of the HSK mm lsaxial distance of the gravity centre of the tool set from the face stop of the HSK mm m total mass of the tool set (individual tools, arbor, spacers, HSK) g nHSKmaximum permissible rotational speed of the HSK i
38、nterface min1nmaxmaximum rotational speed of the tool according to EN 8471:2017 min1r1cutting radius according to EN 8471:2017 mm S gravity centre of the tool set tpplanarity tolerance of the face stop of the HSK mm trrun-out tolerance of the HSK mm P working point of the insertion force on the HSK
39、BS EN 8472:2017EN 847-2:2017 (E) 14 PCcutting power kW PMotspindle motor power kW angular speed s1The maximum permissible rotational speed nHSKof the HSK interface is based on the balance of moments related to point P. HSKHSK cc ss2dF Fl Fl = + (12) with 2s= emF (13) If more than one tool is mounted
40、 on an HSK clamping device the tool with the highest value Fc lcshould be used for the calculation of nHSK. For calculation of nHSKthe following formula applies: HSKr HSK cc3HSKss30210df F Flnmelf = (14) e = eHSK+ eTS(15) spHSK rHSK2( )ltetd= + (16) TSmax30GGfG fGen = =(17) If Fcis unknown, Fccan be
41、 calculated according to EN 847-1:2017: Fc= Fm b1Fm= 50 N/mm (for tools with a cutting radius r1 20 mm) 306101 1 maxMotPFmrbn = (for tools with a cutting radius r1 20 mm) (18) Alternative Fccan be calculated as transmissible force according to the spindle power: 6c Motcc 1 max3010PPFv rn=(19) BS EN
42、8472:2017EN 847-2:2017 (E) 15 Figure 5 Quantities for calculation of nHSK6 Marking of tools with cylindrical shank Tool marking shall include the following items: a) The maximum rotational speed nmaxaccording to EN 847-1:2017 or nshankwhichever is the lowest; b) The permissible eccentricity esp; EXA
43、MPLE Tool marking example for list items a) and b): “nmax 12 000 e 0,06”. c) The free shank length l0or the minimum clamping length le minaccording to Figure 6: 1) if nshank nmax: the free shank length l0(see Figure 6a); 2) if nshank nmax: the minimum clamping length le min(see Figure 6b) and Table
44、2). BS EN 8472:2017EN 847-2:2017 (E) 16 a) example for nshank nmaxb) example for nshank nmaxKey 1 chuck 2 tool l0free shank length le minminimum clamping length Figure 6 Marking BS EN 8472:2017EN 847-2:2017 (E) 17 Annex A (informative) Examples of calculation A.1 Example of calculation of nshankSee
45、5.2. Table A.1 Calculation of nshankDescription Quantity Value Unit Shank diameter d225 mm Total shank length lg80 mm Free shank length l025 mm Mass of shank at the free shank length l0m196 g Tool diameter dcut125 mm Height of tool components l140 mm Form factor f 0,9 Mass of cutting part in the are
46、a of l1mcut3 853 g Reduced mass of the cutting part m*cut3 468 g Reduced mass of the tool m* 3 564 g Axial distance of gravity centre ls44,1 mm Balance quality grade G 40 mm s1Fatigue strength under reversed stresses w340 N mm2Eccentricity at clamping device esp0,1 mm Modulus of elasticity (steel) E
47、 210 000 N mm2Density (steel) 0,007 85 g mm3Safety factor fs4 Maximum permissible rotational speed nshank19 256 min1BS EN 8472:2017EN 847-2:2017 (E) 18 A.2 Examples of calculations of nHSKSee 5.3. Table A.2 Calculations of nHSKDescription Quantity Example 1 Example 2 Example 3 Unit Lifetime degradat
48、ion factor of balance quality grade fG2,5 2,5 2,5 Safety factor fs4 4 4 Friction factor fr0,7 0,7 0,7 Clamping force of HSK FHSK11 000 11 000 11 000 N Nominal diameter of HSK dHSK63,00 63,00 63,00 mm Cutting force Fc255 255 255 N Axial distance of cutting force lc200 200 200 mm Total mass of tool m
49、8 000 8 000 8 000 g Balance quality grade G 16a)6,3b)2,5c)mm s1Maximum rotational speed according to EN 8471:2017 nmax8 100 8 100 8 100 min1Planarity tolerance of the face stop of the HSK tp0,002 0,002 0,002 mm Run-out tolerance of the HSK tr0,003 0,003 0,003 mm Gravity centre displacement e 0,0606 0,0320 0,0208 mm Axial distance of gravity centre ls165 165 165 mm Maximum rotational speed of HSK nHSK7 387 10 161 12 598 min1Maxi
