1、BRITISH STANDARD BS ISO 2020-1:1997 Incorporating Amendment No.1 Aerospace Preformed flexible steel wire rope for aircraft controls Part 1: Dimensions and loads ICS 49.035BSISO 2020-1:1997 This British Standard, having been prepared under the directionof the Engineering SectorBoard, was published un
2、der the authority of the Standards Board and comes intoeffect on 15 November1997 BSI 05-1999 ISBN 0 580 28745 9 National foreword This British Standard reproduces verbatim ISO 2020-1:1997 and implements it as the UK national standard. The UK participation in its preparation was entrusted to Technica
3、l Committee ACE/14, Aerospace details and parts, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related intern
4、ational and European developments and promulgate them in the UK. A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found
5、in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards a
6、re responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, theISO title page, page ii, pages1 to4 and a back cover. This stand
7、ard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No. Date Comments 10157 February 1999 Clause8 replacedBSISO2020-1:1997 BSI 05-1999 i Contents Page Nat
8、ional foreword Inside front cover Foreword ii 1 Scope 1 2 Normative references 1 3 Definitions 1 4 Dimensions, masses, strengths of wire for ropes 1 5 Materials 1 6 Ropes 2 7 Dimensions, masses, elongation and loads for ropes 3 8 Designation 4 9 Technical specification 4 Table 1 Limit deviations for
9、 wire diameters 1 Table 2 Minimum amounts of zinc coating for carbon steel wire 1 Table 3 Limits for cast analysis 2 Table 4 Limits for cast analysis 2 Table 5 Dimensions, masses and loads 3 Table 6 Elongation 3ii blankBSISO2020-1:1997 ii BSI 05-1999 Foreword ISO (the International Organization for
10、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 for which a technical committee has been established has the r
11、ight 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) on all matters of electrotechnical standardization. Draft Inter
12、national Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least75% of the member bodies casting a vote. International Standard ISO2020-1 was prepared by Technical Committee ISO/TC20, Aircraf
13、t and space vehicles, Subcommittee SC12, Mechanical system parts. This first edition of ISO2020-1 together with ISO2020-2 cancels and replaces ISO2020:1984. ISO2020 consists of the following parts, under the general title Aerospace Preformed flexible steel wire rope for aircraft controls: Part 1: Di
14、mensions and loads; Part 2: Technical specification. Descriptors: Aircraft industry, aircraft equipment, control devices, steel products, wire, wire rope, specifications, dimensions, materials specifications, mechanical properties, manufacturing requirements, designation.BSISO2020-1:1997 BSI 05-1999
15、 1 1 Scope This part of ISO2020 specifies the requirements which shall be satisfied by preformed flexible steel wire ropes for aircraft controls. The wire ropes shall be capable of operation within the temperature range of54C to+121C. 2 Normative references The following standards contain provisions
16、 which, through reference in this text, constitute provisions of this part of ISO2020. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this part of ISO2020 are encouraged to investigate the possibility of applyi
17、ng the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO2020-2:1997, Aerospace Preformed flexible steel wire rope for aircraft controls Part2: Technical specification. ISO2408:1985, Steel wire ropes for ge
18、neral purposes Characteristics. ISO2532:1974, Steel wire ropes Vocabulary. ISO3578:1980, Steel wire ropes Standard designations. 3 Definitions For the purposes of this part of ISO2020, the definitions and designations given in ISO2408, ISO2532 and ISO3578 apply. 4 Dimensions, masses, strengths of wi
19、re for ropes 4.1 Wire diameters The nominal wire diameters necessary for the manufacture of ropes shall be specified by the ropemaker. The limit deviations given in Table 1 apply to the diameters of the finished wire. Table 1 Limit deviations for wire diameters 4.2 Zinc coating (for carbon steel wir
20、e only) The minimum values of the mass per unit area of zinc coating for carbon steel wire shall conform to the values given in Table 2. Table 2 Minimum amounts of zinc coating for carbon steel wire 5 Materials 5.1 Carbon steel wire Carbon steel wire rod shall be used for the manufacture of wire for
21、 ropes. It shall be cold drawn and zinc coated. Dimensions in millimetres Nominal wire diameter Limit deviations for wire diameters 0,15 to 0,40 to 0,15 to 0,25 to 0,40 to 0,50 to0,80 10 15 30 50BSISO2020-1:1997 2 BSI 05-1999 5.1.1 Steel analysis The cast analysis shall be within the limits given in
22、 Table 3. Table 3 Limits for cast analysis 5.2 Corrosion-resisting steel wire Corrosion-resisting alloy steel wire rod shall be used for the manufacture of wire for ropes. It shall be cold drawn. 5.2.1 Steel analysis The cast analysis shall be within the limits given in Table 4. Table 4 Limits for c
23、ast analysis 6 Ropes 6.1 Construction Wire ropes covered by this part of ISO2020 are of the two types of construction shown in Table 5. 6.1.1 7 7 construction This type of wire rope shall be composed of six outer strands each of seven wires laid in a right-hand direction around a steel centre strand
24、 of seven wires. The steel centre strand shall be composed of a layer of six wires laid in a right-hand direction around a core or king wire. It shall be of sufficient diameter to give full support to the outer strands. The six outer strands shall be composed of a layer of six wires laid in a left-h
25、and direction around a core or king wire. The lengths of lay shall be as follows: a) the six outer strands shall be laid around the steel centre strand with a length of lay between six and eight times the nominal diameter of the rope; b) the lengths of lay of six wires of the steel centre strand and
26、 of the outer strands shall not exceed60% of the length of lay of the rope. 6.1.2 7 19 construction This type of wire rope shall be composed of six outer strands each of19wires laid in a right-hand direction around a steel centre strand of19wires. The steel centre strand shall be composed of a first
27、 layer of six wires laid in a right-hand direction around a core or king wire, and a second layer of12 wires laid in a right-hand direction. It shall be of sufficient diameter to give full support to the outer strands. Element % (m/m) min. max. Carbon Silicon Manganese Phosphorus Sulfur Sulfur+phosp
28、horus combined 0,5 0,4 0,85 0,35 0,9 0,04 0,04 0,065 Element % (m/m) min. max. Carbon Silicon Manganese Phosphorus Sulfur Chromium Nickel 17,0 8,0 0,15 1,0 2,0 0,045 0,03 20,0 12,0BSISO2020-1:1997 BSI 05-1999 3 The six outer strands shall be composed of a first layer of six wires and a second layer
29、of twelve wires laid in a left-hand direction around a core or king wire. The lengths of lay shall be as follows: a) the six outer strands shall be closed around the steel centre strand with a length of lay between six and eight times the nominal diameter of the rope; b) the inner layer of six wires
30、 of the steel centre strand and the outer strands shall have a length of lay of less than60% of the length of the outer layer; c) the outer layer of the steel centre strand and the outer strands shall have a length of lay of less than50% of the length of lay of the rope. 7 Dimensions, masses, elonga
31、tion and loads for ropes 7.1 Dimensions, masses and loads Table 5 Dimensions, masses and loads 7.2 Elongation Elongation shall be tested under permanent loading on ropes of7 7 and7 19 constructions in accordance with the values given in Table 6. Table 6 Elongation 1 2 3 4 5 6 7 Nominal diameter of w
32、ire rope Construction Measured diameter (average) Minimum breaking load Approximate mass per100m mm mm kN kg min. max. Carbon steel Corrosion-resisting steel 1,2 1,2 1,4 1,20 1,20 0,65 1,6 7 7 1,6 1,8 2,15 2,15 1,2 2,4 2,4 2,7 4,10 4,10 2,4 7 19 4,45 2,6 3,2 3,2 3,5 8,90 7,85 4,3 4,0 4,0 4,4 12,45 1
33、0,70 6,7 4,8 4,8 5,2 18,60 16,50 9,7 5,6 5,6 6,0 24,90 22,25 12,8 6,4 6,4 6,8 31,20 28,50 16,4 7,2 7,2 7,7 35,60 34,70 20,8 8,0 8,0 8,6 43,60 40,05 25,8 9,5 9,5 10,2 64,10 53,40 36,2 1 2 3 4 5 Percentage load of minimum breaking load of rope Percentage elongation min. max. min. max. Rope constructio
34、n 7 7 7 19 5 0,03 0,09 0,03 0,10 10 0,08 0,20 0,08 0,22 25 0,23 0,45 0,23 0,50 40 0,40 0,62 0,40 0,71 50 0,50 0,74 0,50 0,85 60 0,60 0,85 0,60 1,00BSISO2020-1:1997 4 BSI 05-1999 8 Designation Each lot of wire rope ordered to the specifications of this part of ISO2020 shall be designated in accordanc
35、e with the following example: For call-up purposes on drawings it is not normal to call up wire rope on its own as assemblies of wire rope and end fittings are usually shown. In this instance the designation in the list of parts need not show the length code. 9 Technical specification Wire ropes in
36、accordance with this part of ISO2020 shall also meet the requirements of ISO2020-2.blankBS ISO 2020-1:1997 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It presents the UK view on standards in
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