ISO-9518-1998.pdf
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1、A Reference number ISO 9518:1998(E) INTERNATIONAL STANDARD ISO 9518 Second edition 1998-10-01 Forestry machinery Portable chain-saws Kickback test Matriel forestier Scies chane portatives Essai de rebond Copyright International Organization for Standardization Provided by IHS under license with ISO
2、Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/07/2007 23:01:10 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 9518:1998(E) ISO 1998 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any for
3、m or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. International Organization for Standardization Case postale 56 CH-1211 Genve 20 Switzerland Internetisoiso.ch Printed in Switzerland ii Contents 1 Scope1 2 Normative r
4、eferences1 3 Definitions 1 4 Test method2 4.1 Principle.2 4.2 Materials 3 4.3 Apparatus3 4.4 Preparation3 4.4.1 Physical measurements3 4.4.2 Saw chain preparation.3 4.4.3 Chain-saw preparation4 4.4.4 Kickback machine preparation.4 4.4.5 Chain-saw installation and alignment .4 4.4.6 Saw/clamp/cradle
5、assembly balance.5 4.4.7 Friction measurements .5 4.4.8 Restraining systems alignment5 4.4.9 Impact velocity adjustment.5 4.5 Test requirements and procedures.5 4.5.1 Test requirements5 4.5.2 Kickback testing 6 4.5.3 Kickback energy determination .8 4.5.4 Chain brake energy determination.8 4.5.5 Cha
6、in brake actuation angle measurement 10 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/07/2007 23:01:10 MDTNo reproduction or networking permitted without license from IHS -,-,- ISOISO
7、9518:1998(E) iii 4.5.6 Chain brake stopping time measurement.10 4.6 Kickback angle computation.10 4.6.1 Input data11 4.6.2 BASIC computer program.11 4.6.3 Results11 4.7 Test report.11 Annex A (normative) Computer program flowchart22 Annex B (informative) Basic computer program .33 Copyright Internat
8、ional Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/07/2007 23:01:10 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 9518:1998(E) ISO iv Foreword ISO (the International Organizat
9、ion for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established h
10、as the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Dra
11、ft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard ISO 9518 was prepared by Technical Committee ISO/TC 2
12、3, Tractors and machinery for agriculture and forestry, Subcommittee SC 17, Manually portable forest machinery. This second edition cancels and replaces the first edition (ISO 9518:1992), which has been technically revised, mainly to extend it to include chain-saws with an engine capacity of 80 cm3.
13、 Annex A forms an integral part of this International Standard. Annex B is for information only. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/07/2007 23:01:10 MDTNo reproduction or ne
14、tworking permitted without license from IHS -,-,- ISOISO 9518:1998(E) v Introduction The movement of a chain-saw during kickback can be simulated by a mathematical model. Through application of engineering principles, vertical, horizontal and rotational components of the chain-saws movement are pred
15、icted. The model is presented in this International Standard in the form of a computer program which predicts the peak position of the chain-saw, upward and backward towards the user. This is called the “computed kickback angle“ and is illustrated in figure 1. The computer program uses standard engi
16、neering force-motion equations to predict the path of the saw based on kickback energy, physical characteristics of the chain-saw and simulated operator reaction forces. User reaction forces were determined through analysis of high-speed motion pictures of actual hand-held kickbacks.1) Input data fo
17、r the computer program is obtained from physical measurements and from kickback energy tests performed on a completely assembled chain-saw including powerhead, guide bar and saw chain. Kickback energy of a chain-saw is measured on a apparatus (called the kickback machine) developed specifically for
18、this purpose. Kickbacks are generated by delivering the flat surface of a fibreboard test specimen into contact with the bar tip under controlled conditions. This apparatus and standardized specimen have been found to yield a realistic measurement of kickback energy of any specific saw/bar/chain com
19、bination. The test procedure requires testing over a range of conditions to ensure that peak kickback energy for the particular saw/bar/chain combination on test is determined. When the rotating parts of a chain-saw are stopped by a chain brake, a moment is generated that tends to reduce the kickbac
20、k angle. The procedure accounts for this effect. Annex A is a flow diagram of the computer program used to determine the computed kickback angle. Annex B contains a BASIC language program (complete with examples) to make these computations 1) For additional details see Overview of the KICKBACK Compu
21、ter Program Contents and Development, available from the Portable Power Equipment Manufacturers Association, 4720 Montgomery Lane, Suite 514, Bethesda, MD 20814, USA. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9
22、972545001 Not for Resale, 04/07/2007 23:01:10 MDTNo reproduction or networking permitted without license from IHS -,-,- Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/07/2007 23:01:10 M
23、DTNo reproduction or networking permitted without license from IHS -,-,- INTERNATIONAL STANDARD ISOISO 9518:1998(E) 1 Forestry machinery Portable chain-saws Kickback test 1 Scope This International Standard specifies the methodology for determining the kickback potential of a gasoline-powered chain-
24、saw, complete with guide bar and saw chain. This International Standard has been demonstrated to be an accurate method of measurement for evaluating computed kickback angles and energy associated with chain-saw kickback for chain-saws with engine capacity up to 80 cm 3. It is not intended to evaluat
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