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1、IS0 8662-9 96 4853903 Ob85932 348 W INTERNATIONAL STANDARD IS0 866219 First edition 1996-1 1-1 5 Hand-held portable power tools - Measurement of vibrations at the handle - Part 9: Rammers Machines moteur Portatives - Mesurage des vibrations au niveau des poignes - Partie 9: Marteaux fouloirs Referen
2、ce number IS0 8662-9:1996( E) COPYRIGHT International Organization for Standardization Licensed by Information Handling Services COPYRIGHT International Organization for Standardization Licensed by Information Handling Services IS0 8662-9 96 m 4851903 Ob85933 284 m IS0 8662-9: 1 996( E) Foreword IS0
3、 (the International Organization for Standardization) is a worldwide fed- eration of national standards bodies (IS0 member bodies). The work of preparing International Standards is normally carried out through IS0 technical committees. Each member body interested in a subject for which a technical c
4、ommittee has been established has the right to be represented on that committee. International organizations, governmental and non- governmental, in lialison with ISO, also take part in the work. IS0 collabo- rates closely with the International Electrotechnical Commission (IEC) on all matters of el
5、ectrotechnical standardization. Drat International Standards adopted by the technical committees are cir- culated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Intemational Standard IS0 8662-9 was pre
6、pared by Technical Committee ISO/TC 1 18, Compressors, pneumatic tools and pneumatic machines, Subcommittee SC 3, Pneumatic tools and machines. IS0 8662 consists of the following parts, under the general title Hand-held portable power tools - Measurement of vibrations at the handle: - Part 1: Genera
7、l - - - Part 3 : Grinders Part 2: Chipping hammers and riveting hammers Part 3 : Rock drills and rotary hammers - Part 5: Pavement breakers and hammers for construction work - Patt 6: Impact drills - Part 7: Wrenches, screwdrivers and nut runners with impact, impulse or ratchet action - - Part 9: am
8、mers Part 8: Polishers and rotary, orbital and random orbital sanders - Patt 1 O: Nibblers and shears (6 IS0 1996 All rights resewed. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying an
9、d microfilm, without permission in writing from the publisher. International Organization for Standardization Case Postale 56 CH-121 1 Genve 20 Switzerland Printed in Switzerland ii COPYRIGHT International Organization for Standardization Licensed by Information Handling Services COPYRIGHT Internati
10、onal Organization for Standardization Licensed by Information Handling Services IS0 bb2-9 96 4851903 Ob85934 110 IS0 8662-9:1996(E) Q IS0 Introduction This part of IS0 8662 specifies how a type test for the measurement of vi- brations, at the handles of rammers shall be performed. It supplements IS0
11、 8662-1, which gives the general specifications for the measurement of vibrations at the handles of handheld power-driven tools. It specifies the operation of the tool under type test and other requirements for the per- formance of the type test. Vibration measurements made on rammers operating in t
12、ypical work situ- ations, e.g. ramming sand, have been found to be relatively reproducible. However, the use of foundiy sand as a load for a type test is cumbersome because the sand has to be mixed after each trial. It has therefore been concluded that the type test shall be made on an artificial lo
13、ad (neoprene materials) so designed that acceleration values measured correspond to those found in typical work situations. The reproducibility of the proposed method has been found to be good. The principie of the operation of a ramrner is that the driving medium causes a piston, extended by a rod
14、on the end of which a ramming plate is fixed, to move back and forth. The piston also generates a reaction force on the housing of the machine, which i s the cause of vibration. iv COPYRIGHT International Organization for Standardization Licensed by Information Handling Services COPYRIGHT Internatio
15、nal Organization for Standardization Licensed by Information Handling Services IS0 8662-9 96 4853903 0685935 057 Q IS0 IS0 8662-9:1996(E) - - Part 11: Fastener driving tools (nailers) Part 72: Saws and files with reciprocating action and saws with oscillating or rotating action - Part 13: Die grinde
16、rs - Annex A of this pari of IS0 8662 is for information only. Part 14: Stone-working tools and needle scalers iii COPYRIGHT International Organization for Standardization Licensed by Information Handling Services COPYRIGHT International Organization for Standardization Licensed by Information Handl
17、ing Services IS0 8bb2-9 96 q851903 0685936 T93 INTERNATIONAL STANDARD 0 IS0 IS0 8662-9:1996(E) Hand-held portable power tools - Measurement of vibrations at the handle - Part 9: Rammers 1 Scope This part of IS0 8662 specifies a laboratory method of measuring the vibrations at the handles of rammers,
18、 backfill-rammers, pawing rammers and sand rammers for use in foundries, on building sites, etc. It is a type test procedure for establishing the magnitude of vi- brations at the handles of the power tool when operating on the specified load. It is intended that the results obtained be used to compa
19、re different power tools or different models of the same type of power tool. Although the magnitudes measured are obtained in an artificial operation, they will give an indication of the values that would be found in a real work situation. 2 Normative references The following standards contain provi
20、sions which, through reference in this text, constitute provisions of this part of IS0 8662. At the time of publication, the editions indicated were valid. Ali standards are subject to revision, and parties to agreements based on this part of IS0 8662 are encouraged to investigate the possibility of
21、 applying the most recent editions of the standards indicated below. Members of IEC and IS0 maintain registers of currently valid International Stan- dards. IS0 2787:1984, Rotary and percussive pneumatic tools - Performance tests. IS0 8662-1 :1988, Hand-held portable power tools - Measurement of vib
22、rations at the handle - Part I: General. 3 Quantities to be measured Quantities to be measured are: a) acceleration according to IS0 8662-1 :1988, 3.1, presented as weighted acceleration according to IS0 8662-1 :1988, 3.3; NOTE- Frequency analysis can be omitted if the absence of d.c. shif can be pr
23、oved by other means. b) feed force; c) air or hydraulic pressure; d) blow frequency. 4 Instrumentation 4.1 General For specification of instrumentation see IS0 8662-1 :i 988,4.1 to 4.6. 4.2 Transducer For specification of transducer see IS0 8662-1 :1988, 4.1. 4.3 Mechanical filter Normally it is nec
24、essary to use a mechanical filter for measurements according to this part of IS0 8662 (see IS0 8662-1 :1988, 3.2). 1 COPYRIGHT International Organization for Standardization Licensed by Information Handling Services COPYRIGHT International Organization for Standardization Licensed by Information Han
25、dling Services IS0 8bb2-9 96 m 4853903 Ob85937 92T m IS0 8662-9: 1 996( E) 4.4 Fastening of transducer Fastening of transducer and mechanical filter shall be according to figure 1 and IS0 8662-1:l 988, 4.2. 4.5 Calibration Calibration shall be carried out in accordance with IS0 8662-1 11 988. 4.8. 4
26、.6 Auxiliary equipment The air or hydraulic pressure shall be measured using a manometer of precision class. The blow frequency of the tool during measurement can be determined from a narrow-band analysis of the vibration signal or using a frequency counter. The feed force can be measured with a sca
27、le (see 6 . 3 ) . Q IS0 5 Measurement direction and measurement location 5.1 Measurement direction Measurements shall be made in a direction parallel with the percussive direction, the y-direction (see figure 2). 5.2 Measurement location Measurements shall be made at all gripping zones, where the op
28、erator normally holds the tool and applies the feed force. If it can be proved that all the gripping zones have the same vibration value, measurement in the main gripping zone alone is acceptable. The normal position of the transducer shall be halfway along the length of the gripping zone, except in
29、 the case where the trigger is placed so as to make this unsuitable (see figure 2 ) . y-axis Gripping zone Clamping collars Transducer Mechanical filter Rigid support Clamping collars Figure 1 - Example of fastening of transducer 2 COPYRIGHT International Organization for Standardization Licensed by
30、 Information Handling Services COPYRIGHT International Organization for Standardization Licensed by Information Handling Services IS0 bb2-9 96 4851703 0685938 bb IS0 8662-9:1996(E) y-axis t Alternative transducer positions (possible gripping zones) Figure 2 - Rammer - Measuring direction and alterna
31、tive transducer positions 3 COPYRIGHT International Organization for Standardization Licensed by Information Handling Services COPYRIGHT International Organization for Standardization Licensed by Information Handling Services IS0 8662-9 96 Y851903 Ob85939 7T2 IS0 8662-9:1996(E) Q IS0 6 Determination
32、 of working procedure 6.1 General Measurements shall be carried out on a new, properly serviced and lubricated power tool. During test the power tool shall operate at rated pressure and be used according to the manufacturers specifications. The operation shall be stable and smooth (see 6 . 3 ) . Dur
33、ing the test the energy absorber shall be arranged so that the operator can have an upright posture and work the power tool vertically downwards while Performing the test. -h? operator fihall be able to hold the t-fachine comfortably during Work (see figure 3 ) . Dimensions in millimetres Scala Scal
34、e n 1- =coo I a) Rammer with extended handle =COQ I b) Table rammer Figure 3 -Working position of operator 4 COPYRIGHT International Organization for Standardization Licensed by Information Handling Services COPYRIGHT International Organization for Standardization Licensed by Information Handling Se
35、rvices 0 IS0 6.2 Energy absorber IS0 8662-9 96 m 4851703 Ob85940 414 m IS0 8662-9:1996(E) The energy absorber to be used consists of a 500 mm x 500 mm steel box of wall thickness = 3 mm containing a neoprene foam energy-absorbing material which has a hardness of 40 Shore A to 50 Shore A and a thickn
36、ess of 20 mm (see figure 4). NOTE- Such a box has been found to give an appropriate absorption of the shock wave and consistent reflection waves back to the power tool, as would be found in a normal working situation. 6.3 Feed force The feed force to be applied, in addition to the weight of the powe
37、r tool, shall ensure that the rammer operates at its normal level of petformance, giving a smooth and stable operation. This is achieved by a feed force, FA, which, expressed in newtons, is approximately 10 times the value of the mass, in kilograms, of the power tool. The chosen feed force shall be
38、maintained within the range of f 10 %. NOTE - As an example, if the power tool has a mass of 3,s kg, then the feed force should be approximately 35 N. For vibration-controlled rammers, the feed force to be used shall be decided in a pre-test. The feed force FA can be monitored during the test by let
39、ting the operator stand on a scale. The feed force is then the operators own mass minus the reading on the scale. Dimensions in millimetres Figure 4 - Energy absorber (steel box filled with neoprene foam) 5 COPYRIGHT International Organization for Standardization Licensed by Information Handling Ser
40、vices COPYRIGHT International Organization for Standardization Licensed by Information Handling Services IS0 8662-9 96 W 4853903 0685943 350 IS0 8662-9:1996(E) 7 Measurement procedure and validity of measurements 7.1 Power supply The air pressure shall be measured in accordance with IS0 2787 and mai
41、ntained as specified by the manufacturer. Hydraulic pressure shall be measured and maintained as specified by the manufacturer. The above requirements should be met for tools powered by other means, e.g. tools driven by internal combustion engines. 7.2 Test procedure Three skilled operators shall ea
42、ch carry out one test series with the power tool to be tested. A test series shall consist of five test runs on the energy absorber. When stable operation has been established, the reading shall be obtained from a signal of not less than 16 s duration in each test run. 7.3 Validity of test Measureme
43、nts shall be continued until a valid test series has been obtained, .e. when the coefficient of variation (see 7.4) of five consecutive weighted values is less than 0,15 or the standard deviation is less than 0,30 ds*. 7.4 Variation coefficient The variation coefficient of a test series, C , , is de
44、fined as the ratio between the standard deviation, sn-l, of a series of measurement values and the mean value of the series. sn-1 c, =y where the standard deviation is and the mean value o f the series is n i=l where xi n is the ith value measured; is the number of measurement values. Q IS0 7.5 Eval
45、uation of tests The arithmetic mean value of five values for each transducer position and for each operator shall be calculated. For each transducer position, the overall arithmetic mean value shall be calculated using the mean value obtained for each of the three operators. The largest of these ove
46、rall arithmetic mean values shall be the basis for the declaration. 8 Testreport In addition to that specified in IS0 8662-1:1988, clause 7, the following information shall be given in the test report: a) major dimensions and mass of the power tool; b) dimensions of the energy absorber; c) operating
47、 pressure; d) blow frequency; e) feed force; f) the results of the test (see 7.5). A model test report is shown in annex A. 6 COPYRIGHT International Organization for Standardization Licensed by Information Handling Services COPYRIGHT International Organization for Standardization Licensed by Inform
48、ation Handling Services Q IS0 IS0 8662-9 96 = 4853903 Ob85942 297 9 IS0 8662-9:1996(E) Annex A (informative) Model test report for vibrations at the handle of rammers The test is carried out in accordance with IS0 8662-1 :1988, Hand-held portable power tools - Measurement of vibrations at the handle
49、 - Part 1: General and IS0 8662-9:1996, Hand-held portable power tools - Measurement of vibrations at the handle - Part 9: Rammers. General Tested by: Date: Power tool tested Tool type: . Model No.: . Mass, kg: . Inserted tool Tool type: . Model No: Energy absorber Dimensions, mm: . Operating conditions Blow frequency, Hz: . Pressure, bar: Hydraulic pressure, bar: Duration of each test run, s: Measuring equipment Reported by: . Manufacturer: . Serial No.: . Manufacturer: Length, mm: Serial No: Mass, kg: . Neoprene characteristics: . Hardness Shore A Feed fo
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