1、BRITISH STANDARD AEROSPACE SERIES BS ISO 10792-3:1995 Implementation of ISO 10792-3:1995 Aerospace Airframespherical plain bearings in corrosion-resisting steel with self-lubricating liner Part 3: Technical specification ICS 21.100.10BSISO10792-3:1995 This British Standard, having been prepared unde
2、r the directionof the Engineering SectorBoard, was published underthe authority of the Standards Board and comes intoeffect on 15 January 1996 BSI 11-1999 The following BSI references relate to the work on this standard: Committee reference MCE/7 Draft for comment 92/85975 DC ISBN 0 580 25180 2 Comm
3、ittees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee MCE/7, Rolling bearings, upon which the following bodies were represented: Ball and Roller Bearing Manufacturers Association Institution of Mechanical Engineers Society of Briti
4、sh Aerospace Companies Ltd. Amendments issued since publication Amd. No. Date CommentsBSISO10792-3:1995 BSI 11-1999 i Contents Page Committees responsible Inside front cover National foreword ii Foreword iii Text of ISO 10792-3 1BSISO10792-3:1995 ii BSI 11-1999 National foreword This British Standar
5、d reproduces verbatim ISO 10792-3:1995 and implements it as the UK national standard. This British Standard is published under the direction of the Engineering Sector Board whose Technical Committee MCE/7 has the responsibility to: aid enquirers to understand the text; present to the responsible int
6、ernational committee any enquiries on interpretation, or proposals for change, and keep UK interests informed; monitor related international and European developments and promulgate them in the UK. NOTEInternational and European Standards, as well as overseas standards, are available from Customer S
7、ervices, BSI, 389 Chiswick High Road, London W4 4AL. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal o
8、bligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, theISO title page, pages ii to iv, pages 1 to 20 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the am
9、endment table on the inside front cover.ISO10792-3:1995(E) ii BSI 11-1999 Contents Page Foreword iii 1 Scope 1 2 Normative references 1 3 Definitions 1 4 Required characteristics, inspection and test methods 1 5 Quality assurance 8 6 Acceptance conditions 8 7 Packing 8 8 Certificate of conformity 9
10、Annex A (normative) Checking of permissible and ultimate static loads 15 Annex B (normative) Checking of permissible dynamic radial loads (C 25 ) 17 Annex C (normative) Fluids Essential characteristics 19 Annex D (normative) Measurement of resistance of the liner to peeling 20 Figure 1 7 Figure A.1
11、16 Figure A.2 17 Figure B.1 18 Figure D.1 20 Table 1 Liner thickness 7 Table 2 Deformations 7 Table 3 Maximum allowable wear and tear of the liner 8 Table 4 Starting torque after permissible dynamic radial load test 8 Table 5 Non-destructive inspections to be carried out for qualification 10 Table 6
12、 Destructive inspections and tests to be carried out for qualification 11 Table 7 Test distribution to be carried for qualification 12 Table 8 Inspections and tests to be carried out for acceptance 14 Table B.1 18ISO10792-3:1995(E) BSI 11-1999 iii Foreword ISO (the International Organization for Sta
13、ndardization) 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 righ
14、t 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 Internat
15、ional 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% of the member bodies casting a vote. International Standard ISO 10792-3 was prepared by Technical Committee ISO/TC 20, Aircra
16、ft and space vehicles, Subcommittee SC 15, Airframe bearings. ISO 10792 consists of the following parts, under the general title Aerospace Airframe spherical plain bearings in corrosion-resisting steel with self-lubricating liner: Part 1: Metric series; Part 2: Inch series; Part 3: Technical specifi
17、cation. Annex A to Annex D form an integral part of this part of ISO 10792.iv blankISO10792-3:1995(E) BSI 11-1999 1 1 Scope This part of ISO 10792 gives a technical specification (required characteristics, the methods for checks and tests, the quality assurance, and the qualification, reception and
18、delivery conditions) for spherical plain bearings in corrosion-resisting steel, with self-lubricating liner, designed to be subjected under load to slow rotations and low-strain oscillatory motion only. It is applicable to spherical plain bearings consisting of two concentric rings between which is
19、interposed a self-lubricating liner which is bonded to the spherical surface of the outer ring, when reference is made to it in the relevant product standards or in a defining document. 2 Normative references The following standards contain provisions which, through reference in this text, constitut
20、e provisions of this part of ISO 10792. 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 ISO 10792 are encouraged to investigate the possibility of applying the most recent editions of the standards
21、indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 6811:1983, Spherical plain bearings Vocabulary. ISO 9002:1994, Quality systems Model for quality assurance in production, installation and servicing. ISO 10792-1:1995, Aerospace Airframe spheri
22、cal plain bearings in corrosion-resisting steel with self-lubricating liner Part 1: Metric series. ISO 10792-2:1995, Aerospace Airframe spherical plain bearings in corrosion-resisting steel with self-lubricating liner Part 2: Inch series. ISO 11078:1994, Aerospace Aircraft de-icing/anti-icing non-Ne
23、wtonian fluids, ISOtypeII. 3 Definitions For the purposes of this part of ISO 10792, the definitions given in ISO 6811 and ISO 10792-1 and the following definitions apply. 3.1 crack break in the material which may extend in all directions and be intercrystalline or transcrystalline in character 3.2
24、score, scratch open surface defect resulting from a tearing of the metal 3.3 lap surface defect where particles of metal or sharp edges are folded over and then rolled or forged into the surface 3.4 seam unwelded fold which appears as an open defect in the material 3.5 void area where the adhesive b
25、ond is broken or non-existent leaving a smooth, clean space at the interface between the metallic surface and the liner material 3.6 delivery lot lot of spherical plain bearings packaged for delivery having the same identity block although they may originate from different production lots 4 Required
26、 characteristics, inspection and test methods The required characteristics and the inspection and test methods for qualification and acceptance tests shall be as defined in 4.1 to 4.18.ISO10792-3:1995(E) 2 BSI 11-1999 No. Characteristics Requirements Inspection and test methods Q a A a 4.1 Materials
27、 Materials shall conform to product standard or design documents Chemical analysis or analysis based on the manufacturers certificate of conformity of the semi-finished product. X X 4.2 Configuration The width of the inner ring shallbe greater than the width of the outer ring, so that a tilting move
28、ment is possible in addition to rotation movement. The outer ring shall have no filling (assembly) slots. The outer ring may have face grooves for mechanical swaging. X X 4.3 Dimensions and tolerances Dimensions and tolerances shallconform to product standard or design documents. Appropriate measuri
29、ng tools. Measurement of bore and of outer diameter: a) Rings having a width ofu 10mm: in the centre plane parallel to the outer faces. b) Rings having a width of10mm: in two planes parallel to the outer faces andplaced at a distance from these faces twice the maximum value of the ring chamfer. Dete
30、rmine the minimum and maximum diameters in each plane. Measurement of ring width: Check on the width of each ring (distance between the twofaces) at a minimum of four points. Check on the symmetry of the rings: Repeat after rotation of the outer ring through 180 . X X 4.4 Masses Masses shall conform
31、 to product standard or design documents Appropriate methods. X 4.5 Marking Marking shall conform to product standard or design documents. Marking shall be legible and shall not have a detrimental effect on the material nor adversely affect the working of the spherical plain bearing. Visual inspecti
32、on. X XISO10792-3:1995(E) BSI 11-1999 3 No. Characteristics Requirements Inspection and test methods Q a A a 4.6 Surface appearance The bearings shall be free of surface discontinuities (see3.1, 3.2, 3.3 and 3.4) liable to have an adverse affect on their characteristics and endurance. The liner shal
33、l not contain contaminant products and shall not show any breaks, tearsor voids. Lubrication is not permitted. X X 4.6.1 Assembled rings Visual inspection using suitable methods. 4.6.2 Unassembled rings Magnetic-particle or dye-penetrant inspection. 4.7 Hardness Hardness shall conform to product sta
34、ndard or design documents. Appropriate measurement procedures and instruments. X X 4.8 Surface roughness Surface roughness shall conformto product standard or design documents. Appropriate measurement instruments or visual and manual samples. X X 4.9 Surface treatment Surface treatment shall conform
35、to product standard or design documents. Visual check. In accordance with surface treatment standard. X X 4.10 Behaviour during rotation and tilting movements The spherical plain bearing shall be able to move freely within the limits fixed for anglesof tilt in the product standard or design document
36、s. Manual check. X X 4.11 Starting torques with zero load 4.11.1 At ambient temperature Starting torques shall conform to product standard or design documents. Appropriate measurement procedures and instruments. Precede this measurement with afew manual rotations and tilting movements. With zero loa
37、d, measure the torque, gradually applied to the inner ring, in both directions, maintaining the outer ring fixed. Note the maximum value required for the inner ring to be set in motion. X X 4.11.2 At low temperature Starting torques shall be equal to or less than twice those indicated in the product
38、 standard or design documents. Expose the spherical plain bearing for 4 h to the minimum temperature 5 C. Immediately after wards, measure the torque as indicated in 4.11.1. XISO10792-3:1995(E) 4 BSI 11-1999 No. Characteristics Requirements Inspection and test methods Q a A a 4.11.3 Following a cycl
39、e of extreme temperatures Starting torques shall conform to requirements specified in theproduct standard or design documents. Expose the spherical plain bearing for 1 h to the minimum temperature 2 C, followed by1 h at the maximum temperature 2 C. Repeat this cycle 10 times in succession. Four hour
40、s after this set of cycles, measure the torque, at ambient temperature, in accordance with in 4.11.1. X 4.12 Compliance ofspherical surfaces 4.12.1 Fabric-type liners No difference between measurements obtained on spherical surfaces shall exceed0,08 mm. Clad the bearing in plastic material identical
41、 to that used for metallurgical mounts. Section the bearing on a diameter and normal to the race side face. Grind and polish the exposed surface. Measure the thickness, t, checked at a minimum of five points uniformly spaced around the spherical diameter with the aid of, for example, an optical dial
42、indicator. X 4.12.2 Moulded liners The maximum liner thickness shall occur at the midpoint and shall comply with the requirements of Table 1. Proceed as described in 4.12.1. Measurements shall be made at the midpoint, at the points situated at C/10 from each edge of the outer ring and at least two o
43、ther equally spaced points (seeFigure 1). NOTEThe dimension C is defined in ISO 10792-1 and ISO 10792-2. X 4.13 Permissible static loads 4.13.1 Radial, C s The permissible radial static load shall conform to product standard or design documents. With this load, the inner ring shall be able to take a
44、ny position within the limit of the angle of tilt indicated in the product standard or design documents, and there shall be no maximum total deformations greater than those indicated in Table 2. After suppression of the load, there shall be no residual deformations greater than those indicated in Ta
45、ble 2. See A.1.1. XISO10792-3:1995(E) BSI 11-1999 5 No. Characteristics Requirements Inspection and test methods Q a A a 4.13.2 Axial, C a The permissible axial static load shall conform to product standard or design documents. After suppression of the load, there shall be no residual deformations g
46、reater than those indicated in Table 2. See A.2.1. X 4.14 Ultimate loads After suppression of the radial and axial loads, there shall not be no rupture, nor crack, nor expulsion of the inner ring. See A.1.2 and A.2.2. X 4.15 Permissible dynamic radial loads, C 25 Permissible dynamic radial loads at
47、ambient temperature, at low temperature and at high temperature shall conform to product standard or design documents. After suppression of the loads: a) there shall be no metal-to-metal contact between the inner and the outer rings; b) wear and tear of the liner shall not exceed the values indicate
48、d in Table 3; c) resistance to peeling and adhesion of the liner shall meet the requirements specified in 4.17 and 4.18; d) the starting torque at zero load determined in accordance with 4.11 shall not exceed the value specified inTable 4. See Annex B. XISO10792-3:1995(E) 6 BSI 11-1999 No. Character
49、istics Requirements Inspection and test methods Q a A a 4.16 Compatibility between liner and fluids At the end of the dynamic load test, the requirements specified in 4.15 shall be satisfied. Use one spherical plain bearing per fluid. Turn the inner ring so that it is perpendicular to the outer ring. In this position, immerse the spherical plain bearings, for 24 h, in the fluids defined in Annex C which shall be brought to the following temperatures: a) + 70 C 3 C for those definedin C.3; b) + 45 C
