ISO-2020-2-1997.pdf
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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
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