【BS英国标准】BS EN 847-2-2001 Tools for woodworking — Safety requirements — Part 2 Requirements for the shank of shank-mounted milling tools.doc

【BS英国标准】BS EN 847-2-2001 Tools for woodworking — Safety requirements — Part 2 Requirements for the shank of shank-mounted milling tools.doc BS EN BRITISHSTANDARD 847-2:2001 Incorporating Corrigenda Nos. 1 and 2 Tools for woodworking — Safety requirements — Part 2: Requirements for the shank of shank-mounted milling tools The European Standard EN 847-2:2001 has the status of a British Standard ICS 79.120.10 --`,,,,``,`,,,,`,,,`,,`,`,``,,-`-`,,`,,`,`,,`--- Copyright British Standards Institution Document provided by IHS Licensee=Bureau Veritas/5959906001, 11/08/2004 Reproduced by IHS under license with BSI - Uncontrolled 06:08:23 MST Questions or comments about this message: please call the Copy Document Policy Group at 303-397-2295. BS EN 847-2:2001 National foreword This British Standard is the official English language version of EN 847-2:2001, including Corrigendum March 2003. The UK participation in its preparation was entrusted to Technical Committee MTE/23, Woodworking machinery — Safety, which has the responsibility to: — aid enquirers to understand the text; — present to the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; — monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BS Catalogue I under the section entitled ―International Standards Correspondence Index‖, or by using the ―Search‖ facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are reponble for its correct application. ssi Compliance with a British Standard does not of itself confer immunity from legal obligations. This British Standard, having Summary of pages been prepared under the This document comprises a front cover, an inside front cover, the EN title page, direction of the Engineering pages 2 to 8 an inside back cover and a back cover. Sector Committee, was published under the authority The BS copyright notice displayed in this document indicates when the Iof the Standards Committee document was last issued. and comes into effect on 15 May 2001 Sidelining in this document indicates the most recent changes by amendment. Amendments issued since publication Amd.N o. Date Comments 14384 26 February 2003 Correctioton equation in Clause 6 ? BSI 6 November 2003 Corrigendum No. 1 14701 6 November 2003 Indicate bdy as ideline in the Corrigendum No. 2 margin --`,,,,``,`,,,,`,,,`,,`,`,``,,-`-`,,`,,`,`,,`--- ISBN 0 580 37574 9 Copyright British Standards Institution Document provided by IHS Licensee=Bureau Veritas/5959906001, 11/08/2004 Reproduced by IHS under license with BSI - Uncontrolled 06:08:23 MST Questions or comments about this message: please call the Copy Document Policy Group at 303-397-2295. EN 847-2 EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORMMarch 2001 ICS 79.120.10 Incorporating corrigendum March 2003 --`,,,,``,`,,,,`,,,`,,`,`,``,,-`-`,,`,,`,`,,`--- English version Tools for woodworking — Safety requirements — Part 2: Requirements for the shank of shank-mounted milling tools Outils pour le travail du bois — Prescriptions de sécurité — Maschinen-Werkzeuge für Holzbearbeitung — Partie 2: Prescriptions pour les queues des fraises à queue Sicherheitstechnische Anforderungen — Teil 2: Anforderungen für den Schaft von Fräswerkzeugen This European Standard was approved by CEN on 18 January 2001. 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 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 into its own language and notified to the Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION C OM I TÉ EUR OP ÉEN DE NO R M AL I S ATI ON EUR O P Ä I S C HES KOM I T EE F ÜR N OR M UNG Management Centre: rue de Stassart, 36 B-1050 Brussels Ref. No. EN 847-2:2001 E ? 2001 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Copyright British Standards Institution Document provided by IHS Licensee=Bureau Veritas/5959906001, 11/08/2004 Reproduced by IHS under license with BSI - Uncontrolled 06:08:23 MST Questions or comments about this message: please call the Copy Document Policy Group at 303-397-2295. Page 2 EN 847-2:2001 Foreword This European Standard has been prepared by Technical Committee CEN/TC 142, Woodworking machines — Safety, the Secretariat of which is held by BSI. 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 September 2001, and conflicting national --`,,,,``,`,,,,`,,,`,,`,`,``,,-`-`,,`,,`,`,,`--- standards shall be withdrawn at the latest by September 2001. This European Standard has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association. This European Standard is considered to be a supporting standard to those application and product standards which in themselves support an essential safety requirement of a New Approach Directive and which make reference to this European Standard. Annex A is normative and Annex B is informative. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Introduction The content of this 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. 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 shank and marking of the tool. It applies to shank-mounted milling tools for woodworking irrespective of whether they are mounted perpendicularly or horizontally. This standard complements EN 847-1. 2 Normative references This European Standard incorporates, by dated or undated reference, 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 (including amendments). EN 847-1 Tools for woodworking — Safety requirements — Part 1: Milling tools and circular saw blades. EN 1050 Safety of machinery — Principles for risk assessment. ISO 1940-1 Mechanical vibration — Balance quality requirements of rigid rotors — Part 1: Determination of permissible residual unbalance. Copyright British Standards Institution Document provided by IHS Licensee=Bureau Veritas/5959906001, 11/08/2004 Reproduced by IHS under license with BSI - Uncontrolled 06:08:23 MST Questions or comments about this message: please call the Copy Document Policy Group at 303-397-2295. Page 3 EN 847-2:2001 3 Quantities and units a axis of rotation Figure 1 — Illustration of quantities and units Table 1 — Quantities and units Quantities Description Units dis the tool diameter mm 1 dis the shank diameter mm 2 -2E is the modulus of elasticity N?mm e mm per30 Gis the permissible gravity centre displacement: = eper , nshank eis the eccentricity at clamping device mm sp f is the form factor: f = 0,04 + 0,17 ln (m) , cut(./.) This is an empirical 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 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 In (m) is the natural logarithm of mass of the tool without shank. cut -1G is the product of the permissible eccentricity and the angular velocity mm?s according to ISO 1940-1 --`,,,,``,`,,,,`,,,`,,`,`,``,,-`-`,,`,,`,`,,`--- Copyright British Standards Institution Document provided by IHS Licensee=Bureau Veritas/5959906001, 11/08/2004 Reproduced by IHS under license with BSI - Uncontrolled 06:08:23 MST Questions or comments about this message: please call the Copy Document Policy Group at 303-397-2295. Page 4 EN 847-2:2001 44 mm ，，d 2I is the second moment of area: I = 64 lis the tool height mm 1 lis the free shank length: l= l- lmm 00 g e lis the distance of gravity centre measured from the end of the clamping mm s device lis the clamping length mm e l is the total length of shank mm g mis the mass of tool without shank (as solid body) g cut m* is the reduced mass of the total tool: g 12 m* = f m+ (d) lρ/4., , , , cut 20 4 The value ? takes into account the fact that the mass of the free shank is not placed in the centre of gravity of the milling tool. If known, the reduced mass can be replaced by the real mass. -1n is the operational speed min -1nis the maximum permissible rotational speed with regard to shank strength min shank S is the centre of gravity 33W mm ，， d 2 is the section modulus : W = 32 -2σis the fatigue strength under reversed bending stresses N?mm W -3ρ is the density of shank material g?mm 4 List of hazards Table 2 shows the list of hazards. Table 2 — List of hazards Hazard according to Condition or causes of Corresponding clause of EN 1050 hazard related to the tool this European Standard Mechanical hazards due to: Breaking of the tool 6 - inadequacy of mechanical strength Vibration Dynamic unbalance of tool 6 Variations in the rotational speed Breaking of the tool 6 of tools --`,,,,``,`,,,,`,,,`,,`,`,``,,-`-`,,`,,`,`,,`--- Copyright British Standards Institution Document provided by IHS Licensee=Bureau Veritas/5959906001, 11/08/2004 Reproduced by IHS under license with BSI - Uncontrolled 06:08:23 MST Questions or comments about this message: please call the Copy Document Policy Group at 303-397-2295. Page 5 EN 847-2:2001 5 Tool marking As an exception to the permissible speed range according to 7.4 of EN 847-1, shank-mounted milling tools shall only be marked with the value of nor naccording to 6.1.3.1 of EN 847-1, whichever shank max is the lower. Additionally the permissible eccentricity shall be marked (e.g. n max 12 000 e 0.06). The maximum free shank length shall also be marked as illustrated in Figure 2. Figure 2 — Marking of the maximum free shank length 6 Safety requirements --`,,,,``,`,,,,`,,,`,,`,`,``,,-`-`,,`,,`,`,,`--- For composite tools “G” shall be 16 or less for the balance quality grade 16 according to ISO 1940-1. For complex tools, “G” shall be 40 or less for the balance quality grade 40 according to ISO 1940-1. For calculation of n with a given ethe following equation applies: sp ， , 2 , ， ，l，W σ W σ 2 ww s 6 , , ， ， G ，G e,, 10 sp* ,,3 E I ml,, s15 ， , , n,,,shank 2π W σ ，l， ,,w s e， sp , , 3 E I ,, ,, For calculation of ewith a given n the following equation applies: sp 2 2 ,，1 15 W σ30 G W σ ，l ，， , w 6 w s e , , , 10 ,, ,, sp * n π ml n π 3 E I , , s The safety requirements for the shank strength are fulfilled when using the given tool and material sizes with defined free shank length l, gravity centre displacement eand eccentricity at clamping oper device e, the maximum permissible rotational speed for the shank nis not exceeded during spshank operation. The cutting force is not significant in comparison with the centrifugal force. Therefore the cutting force has not been taken into account. For general use nshall be calculated for e= 0,1 mm and for tools used on NC- and shank sp CNC-machines nshall be calculated for e= 0,06. In other cases the value of eshall be taken shank sp sp according to the equation. For the operation of complex shank-mounted milling tools it has to be considered that the maximum permissible operational speed may not exceed the lower value of the two maximum speed values for the shank strength (n) as well as the strength to overspeed load (n) in accordance with 6.1.3.1 shankmax of EN 847-1. Copyright British Standards Institution Document provided by IHS Licensee=Bureau Veritas/5959906001, 11/08/2004 Reproduced by IHS under license with BSI - Uncontrolled 06:08:23 MST Questions or comments about this message: please call the Copy Document Policy Group at 303-397-2295. Page 6 EN 847-2:2001 The minimum value for the clamping length lshall be as given in Table 3: e Table 3 — Clamping length 10 mm < d< 25 mm d, 10 mm d, 25 mm 2 2 2 l, 20 mm l, 2 d(mm) l, 1,8 d(mm) e e 2 e 2 The tolerance of the shank diameter dshall be g7 for d, 12 mm and g8 for d< 12 mm. 2 2 2 The measured eccentricity eshall be , e. m sp The method of measuring the eccentricity eat clamping devices as given in annex A shall be used. m --`,,,,``,`,,,,`,,,`,,`,`,``,,-`-`,,`,,`,`,,`--- Copyright British Standards Institution Document provided by IHS Licensee=Bureau Veritas/5959906001, 11/08/2004 Reproduced by IHS under license with BSI - Uncontrolled 06:08:23 MST Questions or comments about this message: please call the Copy Document Policy Group at 303-397-2295. Page 7 EN 847-2:2001 Annex A (normative) Method of measuring the eccentricity at clamping devices The diameter of the test mandrel is the nominal diameter of the clamping device. For the test mandrel the following shall apply: a) test mandrel diameter tolerance: g7/g8 in accordance with clause 6; b) test mandrel cylindricity: 0,002 mm; c) test mandrel straightness: 0,002 mm; d) test mandrel roundness: 0,002 mm; e) surface without longitudinal marks; --`,,,,``,`,,,,`,,,`,,`,`,``,,-`-`,,`,,`,`,,`--- f) surface roughness: max. R= 4 µm; z g) surface hardness: 58 + 3 HRC. Key 1 Driving spindle/Clamping device shank 2 Clamping device 3 Test point 1 4 Test point 2 5 Test mandrel L10 mm 1 L(l+ l) - l 2 g 1e trun-out at test point 1 1 trun-out at test point 2 2 α angular deviation Figure A.1 — Measuring method illustration For the calculation of the measured eccentricity ethe following equation applies: m + t t1 2 Measured eccentricity: = , emesp 4 Copyright British Standards Institution Document provided by IHS Licensee=Bureau Veritas/5959906001, 11/08/2004 Reproduced by IHS under license with BSI - Uncontrolled 06:08:23 MST Questions or comments about this message: please call the Copy Document Policy Group at 303-397-2295. Page 8 EN 847-2:2001 Annex B (informative) Table B.1 — Calculation example Quantity Value Unit Shank diameter (d)25 mm 2 Total shank length (l)80 mm g Free shank length (l)25 mm 0 Tool diameter (d)125 mm 1 Tool height (l)40 mm 1 --`,,,,``,`,,,,`,,,`,,`,`,``,,-`-`,,`,,`,`,,`--- Form factor (f) 0,9 Mass of cutting part (f m)3 468,02 g cut Reduced total mass (m*) 3 492,11 g Distance of gravity centre (l)45 mm s -1G for balance quality grade 40 mm?s G 40 for complex tools -2Fatigue strength under reversed stresses (σ)340 N?mm w -2Modulus of elasticity (steel) (E) 210 000 N?mm -3Density (steel) (ρ) 0,007 85 g?mm - 1Permissible rotational speed for e= 0,1 (n) 19 098 min sp shank Copyright British Standards Institution Document provided by IHS Licensee=Bureau Veritas/5959906001, 11/08/2004 Reproduced by IHS under license with BSI - Uncontrolled 06:08:23 MST Questions or comments about this message: please call the Copy Document Policy Group at 303-397-2295. --`,,,,``,`,,,,`,,,`,,`,`,``,,-`-`,,`,,`,`,,`--- Copyright British Standards Institution Document provided by IHS Licensee=Bureau Veritas/5959906001, 11/08/2004 Reproduced by IHS under license with BSI - Uncontrolled 06:08:23 MST Questions or comments about this message: please call the Copy Document Policy Group at 303-397-2295. 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