1、BSI Standards PublicationBS EN 847-3:2013Tools for woodworking Safety requirementsPart 3: Clamping devicesBS EN 847-3:2013 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 847-3:2013. Itsupersedes BS EN 847-3:2004 which is withdrawn.The UK participation in its pr
2、eparation 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 are responsible for its correctapp
3、lication. The British Standards Institution 2013. Published by BSI StandardsLimited 2013ISBN 978 0 580 75763 1ICS 79.120.10Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Commi
4、ttee on 31 October 2013.Amendments issued since publicationDate Text affectedBS EN 847-3:2013EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 847-3 October 2013 ICS 79.120.10 Supersedes EN 847-3:2004English Version Tools for woodworking - Safety requirements - Part 3: Clamping devices Outils pou
5、r le travail du bois - Prescriptions de scurit - Partie 3: Outils de serrage Maschinen-Werkzeuge fr Holzbearbeitung - Sicherheitstechnische Anforderungen - Teil 3: SpannzeugeThis European Standard was approved by CEN on 10 August 2013. CEN members are bound to comply with the CEN/CENELEC Internal Re
6、gulations 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 CEN-CENELEC Management Centre or to any CEN me
7、mber. 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 CEN-CENELEC Management Centre has the same status as the official versions.
8、 CEN members are the national 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, Polan
9、d, Portugal, Romania, 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 2013 CEN All rights of exploitation i
10、n any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 847-3:2013: EBS EN 847-3:2013EN 847-3:2013 (E) 2 Contents Page Foreword 3 Introduction .4 1 Scope 5 2 Normative references 5 3 Terms and definitions .5 4 List of significant hazards 6 5 Design requirements .7 5.1 Ge
11、neral 7 5.2 Hydrostatic clamping devices with open system .7 5.3 Shape 7 5.4 Balance .7 5.5 Testing 8 5.5.1 Test sample and dimensions 8 5.5.2 Formulae and calculation 10 5.5.3 Test procedure 10 5.6 Requirements on tolerances of clamping devices 11 6 Marking of clamping devices . 11 6.1 General . 11
12、 6.2 Marking of clamping devices for bore mounted tools 11 6.3 Marking of clamping devices for shank mounted tools . 11 6.4 Marking of one piece clamping devices for shank mounted tools 12 7 Information for use . 12 7.1 General . 12 7.2 Safe working practice . 12 Bibliography . 13 BS EN 847-3:2013EN
13、 847-3:2013 (E) 3 Foreword This document (EN 847-3:2013) 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 by publication of an identical text o
14、r by endorsement, at the latest by April 2014, and conflicting national 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
15、 identifying any or all such patent rights. This document supersedes EN 847-3:2004. The following table contains a list of modifications from the previous edition. EN 847-3:2004 EN 847-3:2013 Reason 3 Terms 3 Terms and definitions: new headline some new definitions ed/te 5 Safety requirements 5 Desi
16、gn requirements: new numbering ed 7 Information for use 7 Information for use; with 7.2 Safe working practice ed Annex A: Safe work practice No Annex A ed New: Bibliography ed According to the CEN-CENELEC Internal Regulations, the national standards organisations of the following countries are bound
17、 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, Malta, Netherlands, Norway, Poland, Portugal,
18、 Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 847-3:2013EN 847-3:2013 (E) 4 Introduction This European Standard specifies general requirements for the safety of clamping devices for machine tools for woodworking. It is addressed to manufacturers and i
19、t is useful for end users. BS EN 847-3:2013EN 847-3:2013 (E) 5 1 Scope This European Standard specifies all hazards arising from the use of clamping devices for the fastening of milling tools and circular saw blades on woodworking machines and specifies the methods for the elimination or reduction o
20、f these hazards by the design of the clamping device and by the provision of information. This European Standard does not apply to arbors for spindle moulding machines in accordance with EN 848-1 or to clamping flanges for circular sawing blades to be used on circular sawing machines in accordance w
21、ith the standard series EN 1870 and does not cover hazard related to the connection of the clamping device with the machine. Bore mounted tools which are mounted on an interchangeable arbor should be considered as a shank mounted tool. NOTE For definition of “woodworking machines“, see EN 847-1. 2 N
22、ormative 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 the referenced document (including any amendmen
23、ts) applies. EN 847-1:2013, Tools for woodworking Safety requirements Part 1: Milling tools, circular saw blades ISO 1940-1, Mechanical vibration Balance quality requirements for rotors in a constant (rigid) state Part 1: Specification and verification of balance tolerances ISO 10897, Collets for to
24、ol holders with taper ratio 1:10 Collets, holders, nuts ISO 15488, Collets with 8 degree setting angle for tool shanks Collets, nuts and fitting dimensions 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 shank p
25、art of the tool by which it is held SOURCE: ISO 3002-1:1982, 3.2.2 3.2 shank mounted tool tool with a shank 3.3 bore mounted tool tool with a bore for mounting 3.4 tool bore that bore in a tool by which it can be located and fixed by a spindle, arbour or mandrel SOURCE: ISO 3002-1:1982, 3.2.3 BS EN
26、847-3:2013EN 847-3:2013 (E) 6 3.5 clamping device element for fixing the tool on the driving spindle of the woodworking machine, for transferring the torque of the driving spindle and for positioning of the tool 3.5.1 friction lock clamping device clamping device where the connection between tool an
27、d clamping device as well as the positioning of the tool is achieved by friction lock fixing elements (e.g. by spring tensions, gripping elements, hydrostatic clamping elements) 3.5.1.1 clamping device with mechanical clamping fixture clamping device where gripping of the tool in the clamping device
28、 is performed mechanically, e.g. by spring tension, gripping elements 3.5.1.2 clamping device with hydrostatic clamping fixture clamping device where gripping of the tool in the clamping device is performed hydrostatically, e.g. by hydrostatic clamping elements 3.5.1.2.1 hydrostatic clamping element
29、 element which neutralises tolerances between the woodworking tool and the clamping device by elastic deformation Note 1 to entry: The deformation is generated by hydrostatic pressure. 3.5.1.2.2 open system clamping device clamping device where the clamping medium (incompressible fluid, e.g. oil, gr
30、ease) can escape when released and is supplied from the outside when clamped 3.5.1.2.3 close system clamping device clamping device where the clamping medium is permanently and pressure-tightly retained in the system 3.5.1.3 one piece clamping device solid clamping device where the clamping force is
31、 generated by the elasticity of its material, e.g. shrink chuck 3.5.2 form lock clamping device clamping device where the connection between tool and clamping device is achieved by form lock fixing elements, e.g. bayonet type clamping, flatted cylindrical shanks 3.6 maximum rotational speed maximum
32、rotational speed for the operation for which the clamping device is designed 4 List of significant hazards Table 1 shows the list of significant hazards. BS EN 847-3:2013EN 847-3:2013 (E) 7 Table 1 List of significant hazards Hazard Condition or causes of the hazard related to the clamping device Co
33、rresponding clause of EN 847-3 Ejection of parts Incorrect assembly of the clamping device 5.6 Modification of tool position relative to the clamping device 7.2 Dynamic unbalance of the clamping device while rotating 5.4 Loosening of the tool in/on the clamping device during machining 7.2 Fastening
34、of the clamping device on the driving spindle 7.2 Vibrations Dynamic unbalance of the clamping device 5.4 5 Design requirements 5.1 General Clamping devices shall be designed and made of such materials that they withstand the forces and loads expected during operation. Verification: By test procedur
35、e described in 5.5.3. NOTE For the calculation of the shank strength, see EN 847-2. In the area of the mounted surface, clamping devices shall be compatible to woodworking tools. 5.2 Hydrostatic clamping devices with open system Hydrostatic clamping devices with open system shall be designed to reta
36、in the tool in the clamping device in the event of the loss of pressure, e.g. by an additional mechanical locking. Verification: By checking the relevant drawings and visual inspection of the clamping device. 5.3 Shape The cross-section of clamping devices shall have a circular form perpendicular to
37、 the axis of rotation. The following exceptions of the circular form are permissible: thread holes for fixing, balancing screws and balancing holes; widths across flats; shape and dimensions according to the sizes of the wrenches; balancing flats for systems with flatted tool shanks. Verification: B
38、y checking the relevant drawings, measurement and visual inspection of the clamping device. 5.4 Balance Clamping devices having a mass greater than 0,5 kg shall be balanced. BS EN 847-3:2013EN 847-3:2013 (E) 8 Clamping devices with keyways inside the bore shall be balanced without keys and clamping
39、devices with keyways on the outside diameter shall be balanced with keys. Maximum rotational speed nmaxin min1 Permissible residual unbalance for clamping devices TU in kgmmgThe balance quality requirements shown in Table 2 shall be applied. Table 2 Minimum balance quality requirements Number Type o
40、f clamping devices G-value = eperaccording to ISO 1940-1 Formula (expands ISO 1940-1) Explanation of the formula 1 Clamping devices in general 6,3 max5*1106016,0nU =TThe value of 0,601 6 is the product of 260103pere 2 Clamping devices with movable parts of at least 15 % of the total mass 16 max5*110
41、5279,1nU =TThe value of 1,527 9 is the product of 260103pere Verification: By measurement of the clamping device. 5.5 Testing 5.5.1 Test sample and dimensions One-piece sleeves and one-piece arbors shall not be tested. Arbors with form lock elements (e.g. keys) shall be counted as a single element.
42、Test rotational speed: np= 1,5 nmax. Test torsional moment: Mp= 1,5 Mmax. The values (Mmax, nmax, t) and required dimensions shall be determined. The test sample for clamping devices for bore mounted tools shall have a cylindrical shape and contain a required mounting bore (e.g. bore, hollow taper).
43、 The test sample for clamping devices for shank mounted tools consists of a cylindrical part with an appropriate mounting shank (e.g. cylindrical shank, hollow taper shank). The tolerances of the test sample shall be in accordance with the tolerances of the clamping device. The balance quality of th
44、e test sample shall be G40 for complex tools (see EN 847-1). The specific density of the test sample shall be 7,85 kg/dm3. Test sample dimensions are given in Figure 1. BS EN 847-3:2013EN 847-3:2013 (E) 9 a) Clamping device with a test sample with shank b) Clamping device with a test sample with bor
45、e Key 1 clamping device 2 test piece nmax maximum rotational speed in min1 l1body width of the test piece in mm v peripheral speed in m/s angular acceleration in s2 Fptest force in N angular velocity in s1 rptest radius in mm JBmass inertia moment (share of the bore) in kgm2Mptest torsional moment i
46、n Nm Mp= Fp rp 103JCmass inertia moment (share of the test piece without shank) in kgm2 nptest rotational speed in min1 JSmass inertia moment (share of the shank) in kgm2 t deceleration time in s JTmass inertia moment kgm2 r2shank radius in mm specific density in kg/dm3r1outside radius in mm Mmax ma
47、ximum torsional moment in Nmlgshank length in mm Figure 1 Test sample dimensions BS EN 847-3:2013EN 847-3:2013 (E) 10 5.5.2 Formulae and calculation For the calculation of the body width of the test piece the following formulae apply: =max30ntMJpT(1) where JT is: with shank SCTJJJ +=(2) with bore BC
48、TJJJ =(3) For test bodies with cylindrical shank: gpplrrrtnMl =4121241211060(4) If the processes of acceleration or deceleration are not constant, the maximum partial acceleration ( = v/t) shall be considered. EXAMPLE Example of calculation: Test torsional moment Mp= 40,0 Nm Test rotational speed np
49、= 27 000 min1Deceleration time t = 0,5 s Shank radius r2= 12,5 mm Shank length lg= 50,0 mm Outside radius r1= 53,0 mm Body width of the test piece l1= 72,2 mm Specific density = 7,85 kg/dm35.5.3 Test procedure The test procedure is the following: a) The test sample shall be mounted in or on the clamping device. b) The maximum torsional moment Mmaxand the maximum rotational speed nmaxshall be determined. The minimum clamping length must be specified by the manufact
