ASD-STAN PREN 4540-2010 Aerospace series Bearings spherical plain in corrosion resisting steel with self-lubricating liner Elevated load under low oscillations Technical specificat.pdf

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1、ASD-STAN STANDARD NORME ASD-STAN ASD-STAN NORM prEN 4540 Edition P 2 May 2010 PUBLISHED BY THE AEROSPACE AND DEFENCE INDUSTRIES ASSOCIATION OF EUROPE - STANDARDIZATIONAvenue de Tervuren, 270 - B-1150 Brussels - Tel. 32 2 775 8126 - Fax. 32 2 775 8131 - www.asd-stan.orgICS: Supersedes edition P 1 Nov

2、ember 2001 Descriptors: ENGLISH VERSION Aerospace series Bearings, spherical plain, in corrosion resisting steel with self-lubricating liner Elevated load under low oscillations Technical specification Srie arospatiale Rotules, en acier rsistant la corrosion garniture autolubrifiante charge leve sou

3、s faibles oscillations Spcification technique Luft- und Raumfahrt Gelenklager, aus korrosionsbestndigem Stahl mit selbstschmierender Beschichtung Hohe Belastung ohne Montagenut Technische Lieferbedingungen This “Aerospace Series“ Prestandard has been drawn up under the responsibility of ASD-STAN (Th

4、e AeroSpace and Defence Industries Association of Europe - Standardization). It is published for the needs of the European Aerospace Industry. It has been technically approved by the experts of the concerned Domain following member comments. Subsequent to the publication of this Prestandard, the tec

5、hnical content shall not be changed to an extent that interchangeability is affected, physically or functionally, without re-identification of the standard. After examination and review by users and formal agreement of ASD-STAN, it will be submitted as a draft European Standard (prEN) to CEN (Europe

6、an Committee for Standardization) for formal vote and transformation to full European Standard (EN). The CEN national members have then to implement the EN at national level by giving the EN the status of a national standard and by withdrawing any national standards conflicting with the EN. Edition

7、approved for publication 31 May 2010 Comments should be sent within six months after the date of publication to ASD-STAN Mechanical Domain Copyright 2010 by ASD-STAN prEN 4540:2010 (E) 2 Contents Page Foreword2 1 Scope 3 2 Normative references3 3 Terms and definitions .4 4 Required characteristics,

8、inspection and test methods6 5 Quality assurance16 5.1 Product qualification.16 5.2 Acceptance conditions .16 5.2.1 Inspections and tests to be carried out by the manufacturer.16 5.2.2 Users quality control 16 6 Packaging.17 7 Certificate of conformity .17 Annex A (normative) Verification of permiss

9、ible and ultimate static loads 23 Annex B (normative) Verification of dynamic radial loads (C25).27 Annex C (normative) Fluids Essential characteristics29 Annex D (normative) Measurement of the peel strength of the liner .30 Annex E (normative) Duty cycles.31 Annex F (normative) Verification of dyna

10、mic radial loads (C250) 34 Annex G (normative) Low friction coefficient.37 Foreword This standard was reviewed by the Domain Technical Coordinator of ASD-STANs Mechanical Domain. After inquiries and votes carried out in accordance with the rules of ASD-STAN defined in ASD-STANs General Process Manua

11、l, this standard has received approval for Publication. prEN 4540:2010 (E) 3 1 Scope This standard specifies the required characteristics, inspection and test methods, qualification and acceptance conditions for spherical plain bearings in corrosion resisting steel, self aligning with self-lubricati

12、ng liner designed to withstand (under load) slight swivelling and slow rotations only. This standard applies whenever referenced. These bearings EN 4538-1, EN 4538-2, EN 4539-1 and EN 4539-2 are for actuator applications and for use in the temperature range 54 C to 163 C and for EN 4538-003 and EN 4

13、539-003 for use in the temperature range 54 C to 120 C. The liner may be of a fabric or composite material bonded to the inside diameter of the outer ring or in a composite material moulded into a pre-formed cavity between the inner and outer rings. The duty cycle (Annex E, normative) has been estab

14、lished on the basis of a civil aircraft aileron surface application. 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 do

15、cument (including any amendments) applies. EN 4538-1, Aerospace series Bearings, spherical plain, in corrosion resisting steel with self-lubricating liner Elevated load under low oscillations Narrow series Dimensions and loads Metric series 1)EN 4538-2, Aerospace series Bearings, spherical plain, in

16、 corrosion resisting steel with self-lubricating liner Elevated load under low oscillations Narrow series Dimensions and loads Inch series 1)EN 4538-003, Aerospace series Bearings, spherical plain, in corrosion resisting steel with self-lubricating liner elevated under low oscillations Narrow series

17、 Dimensions and loads Part 003: Inch series with low friction coefficient 1)EN 4539-1, Aerospace series Bearings, spherical plain, in corrosion resisting steel with self-lubricating liner Elevated load under low oscillations Wide series Dimensions and loads Metric series 1)EN 4539-2, Aerospace serie

18、s Bearings, spherical plain, in corrosion resisting steel with self-lubricating liner Elevated load under low oscillations Wide series Dimensions and loads Inch series 1)EN 4539-003, Aerospace series Bearings, spherical plain, in corrosion resisting steel with self-lubricating liner Elevated load un

19、der low oscillations Wide series Dimensions and loads Part 003: Inch series with low friction coefficient 1)EN 9133, Aerospace series Quality management systems Qualification procedure for aerospace standard parts ISO 11078, Aircraft De-icing/anti-icing fluids, ISO types II, III and IV TR 4475, Aero

20、space series Bearings and mechanical transmissions for airframe applications Vocabulary 1) Published as ASD-STAN Prestandard at the date of publication of this standard by Aerospace and Defence Industries Association of Europe-Standardization (ASD-STAN), (www.asd-stan.org). prEN 4540:2010 (E) 4 3 Te

21、rms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 Self-lubricated spherical plain bearings, self-aligning in corrosion resistant steel with staking groove for actuator applications These consist of two concentric rings, between which is interposed

22、a self-lubricating liner which is bonded or moulded on the spherical surface of the outer ring. The width of the inner ring is greater than the width of the outer ring, so that a tilting movement is possible in addition to the rotational movement. The outer ring has no assembly slot. This outer ring

23、 has grooves for mechanical swaging. 3.2 surface discontinuities See TR 4475. 3.3 starting torque without load See TR 4475. 3.4 friction coefficient The friction coefficient of the bearing under load is given by the following formula: FRCwhere friction coefficient; C torque moment; F load on the bea

24、ring; R inner spherical ball radius. 3.5 permissible radial static loads radial (Cs) This corresponds to a permissible unit pressure multiplied by the projected surface area, the inner ring being able to take any position within the limits of the tilting angle indicated in the product standards or d

25、esign documentation. The direction of the load shall remain in the center plane of the outer ring. The radial projected surface area is given by the following formula: Ar K (C min. 2 T max.) Where the dimensions shown in Figure 1 are as given in the appropriate product standard. prEN 4540:2010 (E) 5

26、 Figure 1 3.6 dynamic radial load (oscillatory duty cycles) load which may be withstood by a bearing submitted to an oscillating movement following a given number and frequency of cycles, without the wear of the self-lubricating liner exceeding the values given in this standard 3.6.1 oscillating dut

27、y cycles are defined in Annex E. The table defines unit pressure applied. The dynamic radial load is defined for each bearing size by multiplying the unit pressure by the projected surface area, see dimensional standard. 3.6.2 dynamic radial load C25one oscillating cycle includes an angular displace

28、ment of the inner ring in relation to the outer ring from 0 to 25, then from 25 to 25 and finally 25 to 0. 3.6.3 dynamic radial load C250one oscillating cycle includes an angular displacement of the inner ring in relation to the outer ring from 0 to 25, then from 25 to 25 and finally 25 to 0. 3.7 ad

29、hesion of the liner - Void area where the adhesive bond is broken or non-existent and leaves a smooth and clean interface on the metallic surface 3.8 delivery batch this consists of bearings with the same identity block, which may come from different production batches 3.9 ultimate static loads is e

30、quivalent to 1,5 times the permissible static load prEN 4540:2010 (E) 6 4 Required characteristics, inspection and test methods See Table 1. Table 1 Clause Characteristics Requirements Inspection and test methods Q aA b4.1 Materials Shall conform with the product standards or design documentation. C

31、hemical analysis or certificate issued by semi-finished product manufacturer X X 4.2 Dimensions and tolerances Shall conform with the product standards or design documentation. Dimensions not shown shall be at the manufacturers option. Suitable measuring instruments Measurement of bore and outer dia

32、meter: rings with a width of 10 mm: in the center plane; rings with a width of 10 mm: in two planes parallel to the outer faces and at a distance from these faces of twice the maximum value of the ring chamfer. The minimum and maximum diameters shall be determined in each measuring plane. Measuremen

33、t of ring width: the width of each ring (distance between the two faces) shall be verified at a minimum of four points. X X 4.3 Masses Shall conform with the product standards or design documentation. Suitable methods X 4.4 Marking Shall conform with the product standards or design documentation. It

34、 shall be legible and shall not adversely affect the material or the functioning of the bearing. Visual examination X X 4.5 Surface appearance the bearings shall be free of surface discontinuities liable to have an adverse effect on their characteristics and endurance; the liner shall not contain co

35、ntaminant products and shall not show broken or voided areas; lubrication shall not be permitted. X X 4.5.1 Assembled bearings Visual inspection using suitable methods 4.5.2 Unassembled rings Magnetic or dye penetrant inspection 4.6 Hardness Shall conform with the product standards or design documen

36、tation. Suitable processes and measuring instruments X X 4.7 Surface roughness Shall conform with the product standards or design documentation. Suitable measuring instruments or visual-tactile samples X X 4.8 Surface treatment Shall conform with the product standards or design documentation. Visual

37、 inspection; As per surface treatment standard. X X 4.9 Behaviour inrotation and tilt Bearings shall be able to move freely within the angular limits specified in the product standards or design documentation. Manual inspection X X continued prEN 4540:2010 (E) 7 Table 1 (continued) Clause Characteri

38、stics Requirements Inspection and test methods Q aA b4.10 Starting torque without load 4.10.1 at ambient temperature. Shall conform with the product standards or design documentation. Suitable processes and measuring instruments: Measurement of the starting torque shall be preceded by some rotations

39、 and a few turning movements by hand; Measure the torque, applied gradually to the inner ring, in both directions, with the outer ring held stationary. Read off the maximal value required to start up the inner ring. X X 4.10.2 at low temperature. Starting torque 2 times those listed in the product s

40、tandards or design documentation. Subject the bearing, during 4 h at the minimum temperature 5 C; Immediately after, measure the torque following 4.10.1. X 4.10.3 after limit temperatures. Shall conform with Tables 2 (a) and 2 (b). Subject the bearing during 1 h at the minimum temperature 5 C, then

41、1 h at the maximum temperature 2 C; Repeat successively 10 this test; 4 h after these tests, measure the torque, at ambient temperature, following 4.10.1. X 4.11 Spherical surfaces conformity For bonded liners: Difference between the values measured normally to the spherical surfaces shall not excee

42、d 0,08 mm. Encapsulate the bearing in plastic material as used in metallurgical mounts. Section the bearing following a diameter plane and polish the surfaces (see Figure 2). By use of an optical comparator, for example, measure dimension “t“ at a minimum of five uniformly spaced positions across th

43、e bearing (see Figure 2) on both opposite surfaces. The selected points shall include the middle position of the bearing at the C/10 positions. X For injected/moulded liners: the maximum thickness of the liner shall be located between the C/10 positions. The minimum thickness shall be 0,2 mm. Encaps

44、ulate the bearing in plastic material as used in metallurgical mounts. Section the bearing following a diameter plane and polish the surfaces By use of an optical comparator, for example, measure dimension “t“ at a minimum of five uniformly spaced positions across the bearing (see Figure 2) on both

45、opposite surface. The selected points shall include the middle position of the bearing at the C/10 positions. X 4.12 Permissible static loads: radial: Cs; axial: Ca. Shall conform with the product standards or design documentation. No maximum total deflection greater than those listed in Tables 3 (a

46、) and 3 (b) under permissible static loads (Cs). After removing the loads, no permanent deformations greater than those listed in Tables 3 (a), 3 (b) and 3 (c). See Annex A. X 4.13 Ultimate static loads: radial; axial. After the removal of the loads, there shall be no cracks, no push out of the inne

47、r ring or deterioration of the bearing. See Annex A. X continued prEN 4540:2010 (E) 8 Table 1 (continued) Clause Characteristics Requirements Inspection and test methods Q aA b4.14 A Dynamic radial loads C25: at low temperature; at high temperature. Shall conform with the product standards or design

48、 documentation. After the removal of the loads: No metal-to-metal contact between inner and outer ring; The liner wear shall not exceed the values listed in Table 4; The peel-strength and the bond integrity shall be conform with 4.16 and 4.17. See Annex B. X At the end of this test, the starting tor

49、que under radial load shall be measured and shall conform with values listed in Tables 5 (a), 5 (b) and 5 (c). Suitable processes and measuring instruments See Annex F. 4.14 B Dynamic radial loads C250: for EN 4538-003 and EN 4539-003 at low temperature; at high temperature. Shall conform with the product standards or design documentation. After the removal of the loads: No metal-