1、BSI Standards Publication BS ISO 6535:2015 Portable chain-saws Chain brake performanceBS ISO 6535:2015 BRITISH STANDARD National foreword This British Standard is the UK implementation of ISO 6535:2015. It supersedes BS ISO 6535:2008 which is withdrawn. The UK participation in its preparation was en
2、trusted to Technical Committee AGE/29, Forestry machinery. 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. Th
3、e British Standards Institution 2015. Published by BSI Standards Limited 2015 ISBN 978 0 580 78917 5 ICS 65.060.80 Compliance 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
4、on 30 September 2015. Amendments/corrigenda issued since publication Date Text affectedBS ISO 6535:2015 ISO 2015 Portable chain-saws Chain brake performance Scies chane portatives Performance du frein de chane INTERNATIONAL STANDARD ISO 6535 Fourth edition 2015-08-15 Reference number ISO 6535:2015(E
5、)BS ISO 6535:2015ISO 6535:2015(E)ii ISO 2015 All rights reserved COPYRIGHT PROTECTED DOCUMENT ISO 2015, Published in Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical,
6、 including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISOs member body in the country of the requester. ISO copyright office Ch. de Blandonnet 8 CP 401 CH-1214 Vernier, Geneva, Switzer
7、land Tel. +41 22 749 01 11 Fax +41 22 749 09 47 copyrightiso.org www.iso.orgBS ISO 6535:2015ISO 6535:2015(E)Foreword iv 1 Scope . 1 2 Normative references 1 3 T erms and definitions . 1 4 Test objects . 1 5 Apparatus . 1 6 Chain-saw preparation . 2 7 Procedure. 2 7.1 Release force (static test) . 2
8、7.2 Braking time 2 7.2.1 General 2 7.2.2 First measurement of braking times (in new condition) 3 7.2.3 Preliminary running . 3 7.2.4 Second measurement of braking times 3 7.2.5 Interim actuations 3 7.2.6 Third measurement of braking times 3 8 Report 3 8.1 Braking time 3 8.2 Release force . 3 8.3 Cha
9、in lubrication oil . 3 ISO 2015 All rights reserved iii Contents PageBS ISO 6535:2015ISO 6535:2015(E) Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normall
10、y carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the
11、work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. The 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 d
12、ifferent approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial 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 documen
13、t 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 rights 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/p
14、atents). Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement. For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the WTO pri
15、nciples in the Technical Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information The committee responsible for this document is ISO/TC 23, Tractors and machinery for agriculture and forestry, Subcommittee SC 17, Manually portable forest machinery. This fourth edition canc
16、els and replaces the third edition (ISO 6535:2008), which has been technically revised.iv ISO 2015 All rights reservedBS ISO 6535:2015INTERNATIONAL ST ANDARD ISO 6535:2015(E) Portable chain-saws Chain brake performance 1 Scope This International Standard specifies methods for measuring the braking t
17、ime and release force of manually operated chain brakes on portable hand-held chain-saws. 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.
18、For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 6531, Machinery for forestry Portable chain-saws Vocabulary ISO 6533:2012, Forestry machinery Portable chain-saw front hand-guard Dimensions and clearances 3 T erms an d definiti ons For the
19、 purposes of this document, the terms and definitions given in ISO 6531 and the following apply. 3.1 braking time interval from the instant the pendulum hits the guard to when the saw chain is considered to have stopped 4 Test objects The measurements shall be carried out on three different new prod
20、uction saws of the same model, equipped with guide bar and saw chain with the largest diameter drive sprocket as recommended by the manufacturer. 5 Apparatus 5.1 Rotational speed indicator, with a rotating speed reading accuracy of 2,5 % of the indicated value. 5.2 Time recording device, including p
21、ick-ups, having an accuracy of 2,5 ms. 5.3 Pick-up device, for registering the brake arm activation. 5.4 Pick-up device, for registering the saw chain motion. 5.5 Force gauge, having an accuracy of 1 N. 5.6 Pendulum, having a head with a flat strike face of 50 mm 1 mm diameter and an arm with a leng
22、th giving 700 mm 5 mm distance between the swivel point and the centre of the head (see Figure 1). The arm shall be as light as possible. The pendulum shall cause an impact energy of 1,4 J 0,2 J from a drop height (see Figure 1) of 200 mm 5 mm. Sharp edges on the pendulum shall be chamfered. ISO 201
23、5 All rights reserved 1BS ISO 6535:2015ISO 6535:2015(E) 6 Chain-saw preparation The engine shall have been run in and warmed up for 3 min at maximum power speed before the test and the carburettor and ignition (if applicable) adjusted according to the manufacturers instructions. The chain-saw and sa
24、w chain tension shall be adjusted for best cutting performance in accordance with the manufacturers recommendations. If nothing else is stated, the saw chain tension shall be adjusted so that, when a 0,9 kg mass is hanging from the centre of the usable cutting length along the lower portion of the s
25、aw chain, the gap between the saw chain side link and the bar is a maximum of 0,017 mm per millimetre of bar cutting length. The saw chain should move freely on the bar by applying moderate hand pressure. If applicable, the chain oil pump shall be adjusted to its maximum setting according to the man
26、ufacturers recommendations. The type of chain lubrication oil used shall be noted in the test report. 7 Procedure 7.1 Release force (static test) The engine shall not be run during this test. Measure the force needed to activate the brake on the top of the front hand-guard (see Figure 2) at the midp
27、oint of the effective guard width W1 as described in ISO 6533:2012, 7.1. The force shall be applied at a uniform rate. Repeat this measurement twice for a total of three measurements. For each chain-saw, the release force shall be measured before and after the measurement of chain braking time (see
28、7.2) and the results of both series of measurements shall be reported. 7.2 Braking time 7.2.1 General Keep the throttle in a fixed position during the braking. This position shall correspond to the racing speed defined as the manufacturers rated speed for maximum power plus 33 % or full throttle, wh
29、ichever is the lesser. When the saw chain has stopped after braking, adjust the throttle to idling immediately and reset the brake. All tests in which the speed exceeds or is below the racing speed tolerances shall be omitted and repeated. The saw chain has ceased to move, after activation of the ch
30、ain brake, when the time taken for two successive chain drive links or sprocket teeth to pass the measuring point exceeds 5 ms No brake adjustment of any kind and no cleaning shall be carried out during the test. The saw shall be rigidly mounted by the handles during the test. The brake shall be rel
31、eased with a blow from the pendulum (5.6), which shall strike the front hand- guard at the midpoint of the effective guard width W1 as described in ISO 6533:2012, 7.1 and from the drop height causing an impact energy of 1,4 J 0,2 J and along a line of action forming an angle of 45 5 with the axis of
32、 the guide-bar (see Figure 1). Carry out the test according to steps 7.2.2 to 7.2.6. To avoid overheating, the time interval between each actuation of the chain brake shall be at least 30 s and the throttle trigger shall always be deactivated immediately after the chain has stopped after braking.2 I
33、SO 2015 All rights reservedBS ISO 6535:2015ISO 6535:2015(E) 7.2.2 First measurement of braking times (in new condition) Run the engine at racing speed 5 r/s (300 rpm) and carry out five actuations of the brake. Record the braking times. 7.2.3 Preliminary running 7.2.3.1 Perform 300 actuations of the
34、 chain brake at an engine speed between maximum power speed and racing speed. Braking times will not be recorded. 7.2.3.2 Cut softwood for the time it takes to use one tankful of fuel at approximately maximum power speed. The chain brake shall not be activated during this cutting. No cleaning of the
35、 chain saw is permitted during and after this cutting sequence. Check chain tension and adjust if necessary according to Clause 6. 7.2.4 Second measurement of braking times Run the engine at racing speed 5 r/s (300 rpm) and carry out five actuations of the brake. Record the braking times. 7.2.5 Inte
36、rim actuations Run the engine at racing speed 5 r/s (300 rpm) and carry out 15 actuations of the brake. Braking times will not be recorded. 7.2.6 Third measurement of braking times Run the engine at racing speed 5 r/s (300 rpm) and carry out five actuations of the brake. Record the braking times. 8
37、Report 8.1 Braking time Report all recorded braking times and determine the average value of the 10 measurements of 7.2.4 and 7.2.6 in milliseconds. 8.2 Release force Report the six recorded release forces in Newtons. 8.3 Chain lubrication oil Report the type of chain lubrication oil used during the
38、 tests. ISO 2015 All rights reserved 3BS ISO 6535:2015ISO 6535:2015(E) Dimensions in millimetres a a Pendulum drop height. Figure 1 Impact direction and pendulum Figure 2 Measuring direction for release force, F4 ISO 2015 All rights reservedBS ISO 6535:2015BS ISO 6535:2015ISO 6535:2015(E) ISO 2015 A
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