1、BSI Standards PublicationBS ISO 19973-3:2015Pneumatic fluid power Assessment of componentreliability by testingPart 3: Cylinders with piston rodBS ISO 19973-3:2015 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 19973-3:2015. It supersedes BS ISO 19973-3:2007 w
2、hich is withdrawn.The UK participation in its preparation was entrusted to Technical Committee MCE/18, Fluid power systems and components.A list of organizations represented on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 p
3、rovisions of a contract. Users are responsible for its correct application. The British Standards Institution 2015.Published by BSI Standards Limited 2015ISBN 978 0 580 85279 4 ICS 23.100.01 Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was pu
4、blished under the authority of the Standards Policy and Strategy Committee on 30 September 2015.Amendments/corrigenda issued since publicationDate T e x t a f f e c t e dBS ISO 19973-3:2015 ISO 2015Pneumatic fluid power Assessment of component reliability by testing Part 3: Cylinders with piston rod
5、Transmissions pneumatiques valuation par essais de la fiabilit des composants Partie 3: Vrins avec tiges de pistonINTERNATIONAL STANDARDISO19973-3Second edition2015-09-01Reference numberISO 19973-3:2015(E)BS ISO 19973-3:2015ISO 19973-3:2015(E)ii ISO 2015 All rights reservedCOPYRIGHT PROTECTED DOCUME
6、NT ISO 2015, Published in SwitzerlandAll 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, including photocopying, or posting on the internet or an intranet, without prior written pe
7、rmission. Permission can be requested from either ISO at the address below or ISOs member body in the country of the requester.ISO copyright officeCh. de Blandonnet 8 CP 401CH-1214 Vernier, Geneva, SwitzerlandTel. +41 22 749 01 11Fax +41 22 749 09 47copyrightiso.orgwww.iso.orgBS ISO 19973-3:2015ISO
8、19973-3:2015(E)Foreword ivIntroduction v1 Scope . 12 Normative references 13 Terms and definitions . 14 Symbols and units . 25 Test equipment. 26 Test conditions . 26.1 General test conditions 26.2 Initial condition 36.3 Endurance test conditions 36.3.1 Orientation 36.3.2 Side loads . 36.3.3 Stroke
9、lengths . 46.3.4 Test operating time 66.4 Operating adjustments . 77 Test procedures . 77.1 Timing of checks and measurements 77.2 Type and scope of checks and measurements . 77.2.1 Functional check 77.2.2 Measurement of leakage . 77.2.3 Minimum working pressure test (for double-acting cylinders onl
10、y) . 77.2.4 Stroke time test . 88 Failure criteria and threshold levels . 88.1 General . 88.2 Functional failure 88.3 Failure due to leakage . 88.4 Failure related to minimum working pressure . 98.5 Failure due to exceeding the maximum test stroke time 98.6 Customised agreements 99 Data analysis . 9
11、10 Test report . 911 Identification statement (reference to this part of ISO 19973).10Annex A (informative) Methods for calculating side load masses and related dimensions 11Annex B (informative) Test data sheet 18Bibliography .21 ISO 2015 All rights reserved iiiContents PageBS ISO 19973-3:2015ISO 1
12、9973-3:2015(E)ForewordISO (the International Organization 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
13、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 work. ISO collaborates closely with the International Electrotechnical Commission (IEC) o
14、n 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 different approval criteria needed for the different types of ISO documents should be noted
15、. 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 document may be the subject of patent rights. ISO shall not be held responsible for identifying an
16、y 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/patents).Any trade name used in this document is information given for the convenience of us
17、ers 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 principles in the Technical Barriers to Trade (TBT) see the following URL: Foreword - Supplement
18、ary informationThe committee responsible for this document is ISO/TC 131, Fluid power systems.This second edition cancels and replaces the first edition (ISO 19973-3:2007), which has been technically revised.ISO 19973 consists of the following parts, under the general title Pneumatic fluid power Ass
19、essment of component reliability by testing: Part 1: General procedures Part 2: Directional control valves Part 3: Cylinders with piston rod Part 4: Pressure regulators Part 5: Non-return valves, shuttle valves, dual pressure valves (AND function), one-way adjustable flow control valves, quick-exhau
20、st valves.iv ISO 2015 All rights reservedBS ISO 19973-3:2015ISO 19973-3:2015(E)IntroductionIn pneumatic fluid power systems, power is transmitted and controlled through a gas under pressure within a circuit. Pneumatic fluid power systems are composed of components and are an integral part of various
21、 types of machines and equipment. Efficient and economical production requires highly reliable machines and equipment. This part of ISO 19973 is intended to provide requirements and test conditions that permit the assessment of the inherent reliability of pneumatic cylinders with piston rod.It is ne
22、cessary that machine producers know the reliability of the components that make up their machines pneumatic fluid power system. Knowing the reliability characteristic of the component, the producers can model the system and make decisions on service intervals, spare parts inventory and areas for fut
23、ure improvements.There are three primary levels in the determination of component reliability:a) preliminary design analysis: finite element analysis (FEA), failure mode and effect analysis (FMEA);b) laboratory testing and reliability modelling: physics of failure, reliability prediction, pre-produc
24、-tion evaluation;c) collection of field data: maintenance reports, warranty analysis.Each level has its application during the life of a component. A preliminary design analysis is useful to identify possible failure modes and eliminate them or reduce their effect on reliability. When prototypes are
25、 available, in-house laboratory reliability tests are run and initial reliability can be determined. Reliability testing is often continued into the initial production run and throughout the production lifetime as a continuing evaluation of the component. Collection of field data are possible when p
26、roducts are operating and data on their failures are available. ISO 2015 All rights reserved vBS ISO 19973-3:2015BS ISO 19973-3:2015Pneumatic fluid power Assessment of component reliability by testing Part 3: Cylinders with piston rod1 ScopeThis part of ISO 19973 provides test procedures for assessi
27、ng the reliability of pneumatic cylinders with piston rod, both single-acting and double-acting, by testing and the methods of reporting the results of testing. General test conditions and the calculation method are provided in ISO 19973-1. The methods specified in ISO 19973-1 apply to the first fai
28、lure, as obtained with the three-point moving average (3PMA) method, without repairs, but excluding outliers.The lifetime of pneumatic cylinders is usually given in number of cycles or in kilometres. Therefore, whenever the term “time” is used in this part of ISO 19973, this variable is to be unders
29、tood as cycles or kilometres.This part of ISO 19973 also specifies test equipment and threshold levels for tests to assess the reliability of pneumatic cylinders with piston rods.This part of ISO 19973 is intended to be applied to pneumatic piston rod cylinders that conform to ISO 6430, ISO 6432, IS
30、O 15552, and ISO 21287; however, pneumatic piston rod cylinders that do not conform to these International Standards but are used in the same range of operating conditions can be tested in accordance with one of the classes defined in Tables 1 and 2.2 Normative referencesThe following documents, in
31、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 amendments) applies.ISO 1219-1, Fluid power systems and
32、components Graphical symbols and circuit diagrams Part 1: Graphical symbols for conventional use and data-processing applicationsISO 5598, Fluid power systems and components VocabularyISO 10099:2001, Pneumatic fluid power Cylinders Final examination and acceptance criteriaISO 19973-1, Pneumatic flui
33、d power Assessment of component reliability by testing Part 1: General proceduresISO 80000-1, Quantities and units Part 1: GeneralIEC 60050-191, International Electrotechnical Vocabulary, chapter 191: Dependability and quality of service3 Terms and definitionsFor the purposes of this document, the t
34、erms and definitions given in ISO 5598, ISO 19973-1 and IEC 60050-191 apply.NOTE Where a conflict of definitions exists for a term in any of these three documents, the following priority order applies: first, ISO 19973-1; second, ISO 5598; and third, IEC 60050191.INTERNATIONAL STANDARD ISO 19973-3:2
35、015(E) ISO 2015 All rights reserved 1BS ISO 19973-3:2015ISO 19973-3:2015(E)4 Symbols and unitsUnits of measurement shall be in accordance with ISO 80000-1.NOTE Graphical symbols used in this part of ISO 19973 conform to the requirements given in ISO 1219-1.5 Test equipment5.1 The test circuit typica
36、lly includes a pressure source, the cylinders being tested, solenoid valves, and an adjustable flow control valve, which acts as a speed controller. See Figure 1 for a circuit diagram of an example test circuit.The basic circuits in Figure 1 do not incorporate all the safety devices necessary to pro
37、tect against damage in the event of component failure. It is important that those responsible for carrying out the test give due consideration to safeguarding both personnel and equipment.5.2 Cylinders to be tested shall be rigidly installed in the horizontal position and fixed to a secure base to r
38、educe vibration. They shall be fixed at both ends. If necessary, alternate the motion of the cylinders to allow one to extend while another retracts.Key1 to 5 ports6 pneumatic cylinder being tested7 adjustable flow control valve (speed controller)8 directional control valveFigure 1 Example of a test
39、 circuit for determining the reliability of a pneumatic piston rod cylinder by testing6 Test conditions6.1 General test conditionsAll test units shall have passed an acceptance test conducted in accordance with ISO 10099. The general test conditions shall be in accordance with ISO 19973-1.2 ISO 2015
40、 All rights reservedBS ISO 19973-3:2015ISO 19973-3:2015(E)6.2 Initial conditionThe leakage rate of new cylinders shall not exceed the values for this characteristic specified in ISO 10099:2001, Table 1.6.3 Endurance test conditions6.3.1 OrientationThe cylinder being tested shall be installed in the
41、horizontal position.6.3.2 Side loads6.3.2.1 No side loads shall be applied to single-acting cylinders. Test results can be related only to the tested stroke.6.3.2.2 For double-acting cylinders, the side load shall be mounted as follows.a) The side load shall be tightened against the shoulder of the
42、piston rod close to the theoretical reference point (TRP) see ISO 6099 and Figure 2 a). This mounting type should be preferred.b) The side load masses and the distances from the TRP for double-acting cylinders shall be in accordance with Table 1.c) When a counter nut is required, the side load shall
43、 be mounted with a clearance LN from the TRP see Figure 2 b). However, the distance LT shall be maintained as shown in Table 1.d) The side load shall be mounted to engage the piston rod at a distance H below the centre of gravity (CG). Values for H are given in Table 1.a) Figure 2a) b) Figure 2b)Key
44、CG centre of gravity of the side load LN optional space for a counter nutH eccentricity of the side load N counter nut (optional)LT distance between TRP and CG TRP theoretical reference pointLM longitudinal length of the side loadFigure 2 Distance of centre of gravity of the side load from the cylin
45、ders theoretical reference point (TRP) and its eccentricity ISO 2015 All rights reserved 3BS ISO 19973-3:2015ISO 19973-3:2015(E)Table 1 Side load masses and distances from the cylinders theoretical reference pointCylinder bore sizeSide load kgaHmm0,5 mmLTminmmClass 1 light(e.g. ISO 21287)Class 2 med
46、ium(e.g. ISO 6432)Class 3 heavy(e.g. ISO 6430 or ISO 15552)80,03 1,5 2010 0,0512 0,0716 0,1320 0,20 0,2025 0,25 0,3032 0,40235040 0,60 350 1,00 463 1,50 680 2,50 9100 3,50 12125165160 20200 30250 40320 50a5 %.6.3.3 Stroke lengthsThe stroke lengths of cylinders to be tested shall be in accordance wit
47、h Table 2. Methods to calculate side load masses for deviating test stroke lengths are given in Annex A.4 ISO 2015 All rights reservedBS ISO 19973-3:2015ISO 19973-3:2015(E)Table 2 Test stroke lengths for cylindersDimensions in millimetresCylinder bore sizeCylinder test strokeClass 1 (e.g. ISO 21287)
48、Class 2 (e.g. ISO 6432)Class 3 (e.g. ISO 6430 or ISO 15552)double- actingsingle- actingdouble- actingsingle- actingdouble-acting8 20101012 2516 302520 20104025 25 5032 30 16040 405050 256325080100125 320160200250320 ISO 2015 All rights reserved 5BS ISO 19973-3:2015ISO 19973-3:2015(E)6.3.4 Test opera
49、ting timeThe test stroke time of the cylinder shall be verified in both directions in accordance with Figure 3. The test stroke time (tTST) at setup shall be less than 50 % of the test cycle time (tTCT) of the control valve. The test rest time (tr) shall be below 20 % of the half test cycle time but greater than 0 %. This leads to Formula (1):12tttTCTTST r=+ (1)KeyV control valve signal tTCTtest cycle timeS cylinder stroke tTSTtest stroke timet time trtes
