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1、BRITISH STANDARD BS ISO 19973-3:2007 Pneumatic fluid power Assessment of component reliability by testing Part 3: Cylinders with piston rod ICS 23.100.01 ? Licensed Copy: London South Bank University, London South Bank University, Fri Oct 05 02:28:01 GMT+00:00 2007, Uncontrolled Copy, (c) BSI BS ISO
2、 19973-3:2007 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 28 September 2007 BSI 2007 ISBN 978 0 580 54790 4 National foreword This British Standard is the UK implementation of ISO 19973-3:2007. The UK participation in its preparation was
3、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 provisions of a contract. Users are responsible for its corre
4、ct application. Compliance with a British Standard cannot confer immunity from legal obligations. Amendments issued since publication Amd. No. DateComments Licensed Copy: London South Bank University, London South Bank University, Fri Oct 05 02:28:01 GMT+00:00 2007, Uncontrolled Copy, (c) BSI Refere
5、nce number ISO 19973-3:2007(E) INTERNATIONAL STANDARD ISO 19973-3 First edition 2007-08-01 Pneumatic fluid power Assessment of component reliability by testing Part 3: Cylinders with piston rod Transmissions pneumatiques valuation par essais de la fiabilit des composants Partie 3: Vrins avec tiges d
6、e piston BS ISO 19973-3:2007 Licensed Copy: London South Bank University, London South Bank University, Fri Oct 05 02:28:01 GMT+00:00 2007, Uncontrolled Copy, (c) BSI ii Licensed Copy: London South Bank University, London South Bank University, Fri Oct 05 02:28:01 GMT+00:00 2007, Uncontrolled Copy,
7、(c) BSI iii Contents Page Foreword iv Introduction v 1 Scope . 1 2 Normative references. 1 3 Terms and definitions. 2 4 Symbols and units 2 5 Test equipment . 2 6 Test conditions . 2 7 Test procedure 6 8 Threshold levels 6 9 Data analysis. 7 10 Test report . 8 11 Identification statement (reference
8、to this part of ISO 19973). 8 BS ISO 19973-3:2007 Licensed Copy: London South Bank University, London South Bank University, Fri Oct 05 02:28:01 GMT+00:00 2007, Uncontrolled Copy, (c) BSI iv Foreword ISO (the International Organization for Standardization) is a worldwide federation of national stand
9、ards 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 has the right to be represented on that committee. International orga
10、nizations, 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. International Standards are drafted in accordance with the rules given
11、in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft 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
12、% of the member bodies casting a vote. 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 any or all such patent rights. ISO 19973-3 was prepared by Technical Committee ISO/TC 131, Fl
13、uid power systems. ISO 19973 consists of the following parts, under the general title Pneumatic fluid power Assessment of component reliability by testing: Part 1: General procedures Part 2: Directional control valves Part 3: Cylinders with piston rod Part 4: Pressure regulators BS ISO 19973-3:2007
14、Licensed Copy: London South Bank University, London South Bank University, Fri Oct 05 02:28:01 GMT+00:00 2007, Uncontrolled Copy, (c) BSI v Introduction In pneumatic fluid power systems, power is transmitted and controlled through a gas under pressure within a circuit. Pneumatic fluid power systems
15、are composed of components and are an integral part of various types of machines and equipment. Efficient and economical production requires highly reliable machines and equipment. Within the ISO 19973 series, this Part 3 is intended to provide requirements and test conditions that permit the assess
16、ment of the inherent reliability of pneumatic cylinders with piston rod. It is necessary 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
17、 and make decisions on service intervals, spare parts inventory and areas for future 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 testi
18、ng and reliability modelling: physics of failure, reliability prediction, pre-production 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 failur
19、e modes and eliminate them or reduce their effect on reliability. When prototypes are 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
20、 continuing evaluation of the component. Collection of field data is possible when products are operating and data on their failures are available. BS ISO 19973-3:2007 Licensed Copy: London South Bank University, London South Bank University, Fri Oct 05 02:28:01 GMT+00:00 2007, Uncontrolled Copy, (c
21、) BSI blank Licensed Copy: London South Bank University, London South Bank University, Fri Oct 05 02:28:01 GMT+00:00 2007, Uncontrolled Copy, (c) BSI 1 Pneumatic fluid power Assessment of component reliability by testing Part 3: Cylinders with piston rod 1 Scope This part of ISO 19973 provides test
22、procedures for determining reliability of pneumatic cylinders with piston rod by testing and the methods of reporting the results of testing. The general test conditions and the calculation method provided in Part 1 of ISO 19973 apply to the first failure without repairs, but exclude outliers. The l
23、ifetime 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 understood as cycles or kilometres. This part of ISO 19973 also specifies test equipment and threshold levels for tests
24、to determine the reliability of pneumatic cylinders with piston rods, both single-acting and double-acting. This part of ISO 19973 is intended to be applied to pneumatic piston rod cylinders that conform to ISO 6430, ISO 6432, ISO 15552 and ISO 21287; however, pneumatic piston rod cylinders that do
25、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 of this part of ISO 19973. It is necessary that any deviation from this part of ISO 19973 be documented in the test report
26、. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 1000, SI units and r
27、ecommendations for the use of their multiples and of certain other units ISO 1219-1, Fluid power systems and components Graphic symbols and circuit diagrams Part 1: Graphic symbols for conventional use and data-processing applications ISO 5598, Fluid power systems and components Vocabulary ISO 6430,
28、 Pneumatic fluid power Single rod cylinders, 1 000 kPa (10 bar) series, with integral mountings, bores from 32 mm to 250 mm Mounting dimensions ISO 6432, Pneumatic fluid power Single rod cylinders 10 bar (1 000 kPa) series Bores from 8 to 25 mm Mounting dimensions ISO 10099:2001, Pneumatic fluid pow
29、er Cylinders Final examination and acceptance criteria ISO 15552, Pneumatic fluid power Cylinders with detachable mountings, 1 000 kPa (10 bar) series, bores from 32 mm to 320 mm Basic, mounting and accessories dimensions BS ISO 19973-3:2007 Licensed Copy: London South Bank University, London South
30、Bank University, Fri Oct 05 02:28:01 GMT+00:00 2007, Uncontrolled Copy, (c) BSI 2 ISO 19973-1, Pneumatic fluid power Assessment of component reliability by testing Part 1: General procedures ISO 21287, Pneumatic fluid power Cylinders Compact cylinders, 1 000 kPa (10 bar) series, bores from 20 mm to
31、100 mm IEC 60050-191, International Electrotechnical Vocabulary, chapter 191: Dependability and quality of service 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 5598, ISO 19973-1 and IEC 60050-191 apply. Where a conflict of definitions exists for a
32、 term in any of these three documents, the following priority order applies: first, ISO 19973-1; second, ISO 5598; and third, IEC 60050-191. 4 Symbols and units 4.1 Units of measurement are in accordance with ISO 1000. 4.2 Graphic symbols used in this part of ISO 19973 conform to the requirements of
33、 ISO 1219-1. 5 Test equipment The test circuit typically includes a pressure source, the cylinder(s) being tested, a solenoid valve(s) and an adjustable flow control valve, which acts as a speed controller. See Figure 1 for a circuit diagram of an example test circuit. NOTE The basic circuits in Fig
34、ure 1 do not incorporate all the safety devices necessary to protect 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. 6 Test conditions 6.1 General test conditions A
35、ll 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. 6.2 Endurance test conditions 6.2.1 Orientation The cylinder being tested shall be installed in the horizontal position. BS ISO 19973-3:2007
36、 Licensed Copy: London South Bank University, London South Bank University, Fri Oct 05 02:28:01 GMT+00:00 2007, Uncontrolled Copy, (c) BSI 3 Key 1 to 5 ports 6 pneumatic cylinder being tested 7 adjustable flow control valve (speed controller) 8 directional control valve Figure 1 Example of a test ci
37、rcuit for determining the reliability of a pneumatic piston rod cylinder by testing 6.2.2 Side loads 6.2.2.1 No side loads shall be applied to single-acting cylinders. 6.2.2.2 For double-acting cylinders, the side load shall be mounted as follows. a) The centre of gravity (CG) of the side load shall
38、 be situated at a minimum distance, lmin, from the theoretical reference point (TRP); see Figure 2. b) The side load masses and the distances from the TRP for double-acting cylinders shall be in accordance with Table 1. BS ISO 19973-3:2007 Licensed Copy: London South Bank University, London South Ba
39、nk University, Fri Oct 05 02:28:01 GMT+00:00 2007, Uncontrolled Copy, (c) BSI 4 NOTE The centre of gravity (CG) is below the axis of the cylinder to prevent the piston rod from turning during the test. Figure 2 Distance of centre of gravity of the side load from the cylinders theoretical reference p
40、oint Table 1 Side load masses and distances from the cylinders theoretical reference point Side load a kg Cylinder bore size Class 1 Light (e.g. ISO 21287) Class 2 Medium (e.g. ISO 6432) Class 3 Heavy (e.g. ISO 6430 or ISO 15552) lmin mm 8 0,03 10 0,05 12 0,07 16 0,13 20 0,20 0,20 25 0,25 0,30 20 32
41、 0,40 2 40 0,60 3 50 1,00 4 63 1,50 6 80 2,50 9 100 3,50 12 125 16 160 20 200 30 250 40 320 50 50 a 5 %. 6.2.3 Stroke length The stroke length of the cylinder to be tested shall be in accordance with Table 2. BS ISO 19973-3:2007 Licensed Copy: London South Bank University, London South Bank Universi
42、ty, Fri Oct 05 02:28:01 GMT+00:00 2007, Uncontrolled Copy, (c) BSI 5 Table 2 Test stroke lengths Dimensions in millimetres Cylinder test stroke Class 1 (e.g. ISO 21287) Class 2 (e.g. ISO 6432) Class 3 (e.g. ISO 6430 or ISO 15552) Cylinder bore size double-acting single-acting double-acting single-ac
43、ting double-acting 8 10 20 12 25 10 16 30 20 20 40 25 25 50 25 32 30 40 40 10 50 160 63 80 100 50 25 250 125 160 200 250 320 320 6.2.4 Initial test stroke time The initial test stroke time of the cylinder to be tested shall be in accordance with Table 3. Table 3 Initial test stroke times Cylinder bo
44、re sizes mm Maximum initial stroke time s 8, 10, 12, 16, 20, 25 and 32 0,5 40, 50, 63, 80 and 100 0,8 125, 160 and 200 1,2 250 and 320 1,6 BS ISO 19973-3:2007 Licensed Copy: London South Bank University, London South Bank University, Fri Oct 05 02:28:01 GMT+00:00 2007, Uncontrolled Copy, (c) BSI 6 7
45、 Test procedure 7.1 Operating adjustments Operate the test cylinders so that the stroke time does not exceed that specified in Table 3. The stroke time shall include the effects of any adjustable cushioning mechanism used to prevent impact at the end of the stroke. This cushioning shall be adjusted
46、during the course of the test to offset the effect of cushion seal wear. 7.2 Timing of checks and measurements 7.2.1 The following checks and measurements shall be made before, during and after the endurance test: a) functional check in accordance with 7.3.1; b) leakage measurement in accordance wit
47、h 7.3.2; c) measurement of the pressure characteristics accordance with 7.3.3. 7.2.2 Measuring intervals shall be determined in accordance ISO 19973-1. 7.3 Type and scope of the checks and measurements 7.3.1 Functional check Test units shall be checked acoustically, optically and tactilely under tes
48、t conditions to determine whether the test units and the valves controlling them are operating correctly. The functional check is to see whether both end positions are reached. Record the stroke time in each direction. If test units fail between consecutive observations, the termination cycle count
49、shall be determined in accordance with ISO 19973-1. 7.3.2 Leakage measurement Leakage rate shall be measured in both cylinder-end positions at the pressurized port at working pressure. 7.3.3 Minimum working pressure performance test (for double-acting cylinders) A performance test with the side load mounted in accordance with 6.2.2.2 shall be carried out to determine the minimum working pressure after cyclin