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1、INTERNATIONAL STANDARD IS0 2020-2 First edition 1997-08-01 Corrected and reprinted 1997-l 2-01 Aerospace - Preformed flexible steel wire rope for aircraft controls - Part 2: Technical specification Abronautique et espace - Cibles en acier soup/es prkformk pour commandes d akonefs - Pat-tie 2: Sp a=4
2、00net; p=iso; o=isocs; sxentral Printed in Switzerland ii -,-,- INTERNATIONAL STANDARD 0 IS0 IS0 2020-2:1997(E) Aerospace - Preformed flexible steel wire rope for aircraft controls - Part 2: Technical specification 1 Scope This part of IS0 2020, in conjunction with IS0 2020-1, specifies the inspecti
3、ons and tests as well as acceptance and qualification conditions for preformed flexible steel wire ropes for aircraft controls. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this part of IS0 2020. At the time of publ
4、ication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this part of IS0 2020 are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and IS0 maintain registers o
5、f currently valid International Standards. IS0 2020-l :1997, Aerospace - Preformed flexible steel wire rope for aircraft controls - Part 1: Dimensions and loads. IS0 2408:1985, Steel wire ropes for general purposes - Characteristics. IS0 9001 :1994, Quality systems - Model for quality assurance in d
6、esign, development, production, installation and servicing. IS0 9002:1994, Quality systems - Model for quality assurance in production, installation and servicing. 3 General requirements Manufacture and workmanship shall be in accordance with the best practice for high quality aircraft wire ropes co
7、nsistent with the requirements of this part of IS0 2020. The finished cable shall be uniform in construction and securely laid, free from kinks, loose wires, loose strands or other defects. A maximum of one broken wire is permissible on a rope length of 300 mm. Tucked joints may be in wires of diame
8、ter equal to or less than 0,2 mm. For wires of diameter greater than 0,2 mm the joints shall be made by brazing or electric welding. In the same strand, joints shall be not less than 6 m apart. -,-,- IS0 2020-2:1997(E) IS0 4 General inspections and tests All wire rope shall be examined for workmansh
9、ip and finish to determine compliance. For this purpose, the wire rope shall travel no faster than 30 m/min and shall be stopped for closer inspection when necessary. This inspection shall take place at the time the wire rope is wound on shipping reels. Any discard from the head or starting end of t
10、he manufacturing reel shall be removed prior to winding of the shipping reel. The manufacturer shall make available the necessary equipment for testing a rope to the conditions of this part of IS0 2020. Before every inspection and test the inspector shall be satisfied that the measuring instruments
11、are correctly calibrated. Inspections and tests referred to in 5.1 to 5.10 shall be carried out on each lot produced. 5 Specific requirements, inspections and test methods Specific requirements, inspections and test methods are given in 5.1 to 5.10. No. Characteristics Requirements Inspections and t
12、est methods Ql) Al) 5.1 Materials In accordance with IS0 2020-l. Chemical analysis or certificate of x conformity of the manufacturer of the semi-finished product. x 5.2 Dimensions In accordance with IS0 2020-l. The actual diameter of the rope x shall be measured after production with a measuring de
13、vice with jaws broad enough to cover not less than two adjacent strands. At each of three points spaced at least 1 m apart, two measurements shall be taken at right angles to each other. The average of these six measurements shall fall within the specified maximum and minimum diameters. Each end of
14、each manufactured length shall be measured in this manner. These measurements shall be made on a straight portion of the rope under no tension. x 5.3 Masses In accordance with IS0 2020-l. Using a suitable method. X 5.4 Lubrication During rope manufacture a suitable Visual examination and certificate
15、 x lubricant shall be applied so that of conformity of the grease each wire is coated. The lubricant manufacturer. shall reduce internal friction and inhibit corrosion. It shall be resistant in the service temperature range and shall have good lubrication properties. x 5.5 Surfaces Flattening of wir
16、e surfaces of the Visual examination. rope due to manufacture are permissible as long as the requirements of IS0 2020-l are met. X X 0 IS0 IS0 2020-2:1997(E) ! No. Characteristics Requirements Inspections and test methods Ql) A ) 5.5.1 Surface treatment The requirements of IS0 2020-l Testing accordi
17、ng to the Keller- x of zinc coated shall be met. Bohaczek method. ropes x 5.6 Preforming The increase in the diameter of It shall be possible to lead the cut x x the wire rope after cutting shall end through a bore with the not exceed the value indicated in maximum permissible diameter. table 1. Oth
18、er suitable measuring methods, e.g. profile projectors or measuring magnifiers, are permissible. To avoid distorting the cable ends, it is recommended that cutting be carried out electrically or using cutters with constricting jaws. 5.7 Actual breaking The minimum breaking load The actual breaking l
19、oad of the wire x x load according to IS0 2020-l shall be rope shall be determined in met. accordance with IS0 3108. 5.8 Elongation The requirements of IS0 2020-l From each wire rope of the 7 x 7 x x shall be met. and 7 x 19 constructions a sufficient length shall be selected to provide an unobstruc
20、ted minimum test length of 500 mm between the jaws of the test machine. This test length shall be progressively loaded (max. 10 mm/min) until 60 % of the minimum breaking load is reached. This load shall be maintained for 1 min. It shall then be released to 2 % of the minimum breaking load. Under th
21、is initial load a gauge length of 250 mm shall be marked or another suitable measuring device with a minimum distance of 100 mm between cutting edges shall be applied. The rope shall then be progressively loaded (max. 10 mm/min) until 60 % of its minimum breaking load is reached and its elongation d
22、etermined when 5 %, 10 %, 25 %, 40 % and 60 % of the minimum breaking load are reached. -,-,- IS0 2020-2: 1997(E) IS0 No. Characteristics Requirements Inspections and test methods Ql) A ) 5.9 Shear proof test After testing no single wire shall Using the same test piece as for the x x be broken. elon
23、gation test the load shall be progressively increased until a value of 80 % of the minimum breaking load is reached and maintained for a minimum period of 5 s. This load shall then be released and the test piece completely separated into its constituent wires and each wire shall be examined. NOTE- T
24、he manufacturer may use, at his discretion, electronic devices which have been developed to detect the breaking of wires while the test is being carried out. However in the event of any conflict of evidence, the test method described shall be used as the reference method. 5.10 Endurance test After e
25、ndurance testing and the An endurance test shall be carried x x subsequent test according to out for each lot of wire rope. The subclause 5.5 the values of the number of reversals and the wire minimum breaking load shall rope test load shall be as indicated be met. in table 1. The test apparatus sha
26、ll conform to figure 1. The total travel of the cable in one direction shall be 343 mm. The test pulleys shall be made of steel and shall conform to the dimensions of figure 2 and table 2. The application of lubricant to the endurance test sample, in addition to the lubricant applied during the manu
27、facture of wire rope, shall not be permitted either before or during the endurance test. After endurance testing the breaking load of the wire rope shall be rechecked in accordance with 5.7 as follows: a) the test length shall be that portion of the wire rope that passes over the test pulley during
28、the endurance test; b) the breaking load shall, as a minimum, conform to the values specified in table 1. 1) A = Acceptance test, Q = Qualification test -,-,- 0 IS0 IS0 2020-2:1997(E) 6 Re-test If the requirements of an inspection or test method are not met, a re-test may be carried out taking two f
29、urther test lengths from the end of the same production length. If both test lengths conform to the requirements of this part of IS0 2020, the relevant lot of wire rope shall be deemed to comply with requirements of this part of IS0 2020. A complete report of the tests shall be prepared and supplied
30、 with the dispatch documents for each test lot. Table 1 - Breaking load after endurance test and permissible increase in diameter Nominal Wire rope Number Minimum breaking load Maximum rope diameter Construction test of for carbon for corrosion- diameter after of load ) reversals2) steel31 resisting
31、 steei4) performing wire rope min. test mm N kN kN mm 12 135 0,60 0,70 1,60 136 7x7 22 1,07 1,28 2,lO 70000 2,05 2,4 40 2,45 2,95 2,25 3,2 80 4,45 497 3,85 470 107 6,25 694 4,85 498 165 9,30 999 5,75 583 7x19 225 12,45 13,4 6,55 634 285 130000 15,60 17,0 7,40 7,2 350 17,80 20,8 8,30 890 400 21,80 24
32、,0 9,15 9s 535 32,05 32,0 lo,85 1) The wire rope test load is equal to one half the weight which includes idler pulley and hanger. 2) 1 cycle = 2 reversals. 3) Minimum breaking load equal to 50 % of the original minimum breaking load, prior to the endurance test. 4) Minimum breaking load equal to 60
33、 % of the original minimum breaking load, prior to the endurance test. 7 Quality assurance 7.1 Quality assurance and management system The manufacturer shall proceed on the basis of a quality assurance and management system in accordance with IS0 9001 or IS0 9002 which has been certified by an appro
34、ved authority. The certification has to be presented to the airworthiness authority of the receiving country or to the appointed representatives on their request. 7.2 Product qualification testing approval The qualification approval test shall consist of all the tests specified in clause 5. 7.3 Cert
35、ificate of conformity Each lot of wire rope supplied in conformity with this part of IS0 2020 shall be accompanied by a certificate of conformity. -,-,- IS0 2020-2:1997(E) 8 Delivery, packing and marking 8.1 Delivery Each consignment shall consist of a maximum of 6 000 m wire rope of the same constr
36、uction and the same diameter produced in one production run on one or a series of successive machines. Ropes shall be delivered in minimum lengths of 300 m, except that up to 20 % of the rope ordered may be supplied in lengths between 150 m and 300 m. 8.2 Packing 8.2.1 Ordinary packing The rope shal
37、l be wound on a suitable reel. The diameter of the barrel of the reel shall exceed 40 times the diameter of the rope. The flanges and the barrel of the reel shall be covered with waterproof material before the rope is wound onto the reel. When it is fully wound, the exposed surface shall be covered
38、with a layer of waterproof material held down by appropriate means. 8.2.2 Special packing Any special packing shall be specified in the order. 8.3 Marking A label shall be fixed on the reel bearing the following information: a) the designation in accordance with IS0 2020-l; b) the name of the manufa
39、cturer; c) the order number; d) the number of manufacture; e) the date of manufacture; f) the inspection note. 9 Test equipment for endurance test The test equipment for the endurance test is shown in figure 1. The test pulleys are shown in figure 2 and their dimensions are given in table 2. -,-,- 0
40、 IS0 IS0 2020-2: 1997(E) Dimensions in millimetres Clamp the cable to the drum having an oscillation rate of120 Free-running pulley, 295mmmin 1 Wire ropetestload (see table I) z $ T and table 2) 7 /, -.- Figure 1 - Apparatus for endurance test IS0 2020-2: 1997(E) IS0 X Groove radius rGrind to smooth
41、 finish Dimensions in millimetres Dimensions (see table 2) Material: tool steel Heat treatment: harmed to HRC 60 min 1) The diameter A is that corresponding to the pulley support which is on a suitable bail or roller bearing, or shaft with extensions supported on suitable ball or roller bearings. NO
42、TE - This is a typical application and the dimensions of the test pulleys and the magnitude of the test loads are not intended as design criteria. Figure 2 - Test pulleys for use in endurance test -,-,- Table 2 IS0 2020-2: 1997(E) Nominal Dimensions diameter Construction Pulley ratio ) 213) D & of w
43、ire rope d + 0,13 + 0,05 0 0 mm mm mm mm 12 18 14,27 0,635 196 7x7 12:i 24 19,05 0,914 36 30,98 2,4 1,32 24 16,57 7:i 3,2 32 22,22 I,75 430 50 37,69 2,20 438 60 45,24 2,60 596 7x19 70 52,78 3,00 634 9,5:1 80 60,32 3,40 7,2 90 67,84 3,81 890 100 75,40 4,24 935 120 go,49 5,08 1) Ratio of pulley diamet
44、er D and diameter of wire rope d. 2) G is a reference number, not a mandatory dimension, and is left to the manufacturer s discretion. 3) C=Di3d G2) mm 10 13 14 9 -,-,- IS0 2020-2:1997(E) ICS 49.035 Descriptors: aircraft industry, aircraft equipment, control devices, steel products, wire, wire rope, tests, mechanical tests, acceptance testing, inspection, marking, packaging. Price based on 9 pages -,-,-