1、ASD-STAN STANDARD NORME ASD-STAN ASD-STAN NORM prEN 2311 Edition P 2 September 2015 PUBLISHED BY THE AEROSPACE AND DEFENCE INDUSTRIES ASSOCIATION OF EUROPE - STANDARDIZATION Rue Montoyer 10 - 1000 Brussels - Tel. 32 2 775 8126 - Fax. 32 2 775 8131 - www.asd-stan.org ICS: Supersedes edition P 1 of Ma
2、y 2010 and will supersede EN 2311:2012 Descriptors: ENGLISH VERSION Aerospace series Bushes with self-lubricating liner Technical specification Srie arospatiale Bagues avec garniture autolubrifiante Spcification technique Luft- und Raumfahrt Buchsen mit selbstschmierender Beschichtung Technische Lie
3、ferbedingung This “Aerospace Series“ Prestandard has been drawn up under the responsibility of ASD-STAN (The 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
4、 the concerned Domain following member comments. Subsequent to the publication of this Prestandard, the technical 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 user
5、s and formal agreement of ASD-STAN, it will be submitted as a draft European Standard (prEN) to CEN (European 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 th
6、e status of a national standard and by withdrawing any national standards conflicting with the EN. Edition approved for publication 1st September 2015 Comments should be sent within six months after the date of publication to ASD-STAN Mechanical Domain Copyright 2015 by ASD-STAN prEN 2311:2015 (E) 2
7、 Contents Page Foreword 2 1 Scope 3 2 Normative references 3 3 Terms and definitions . 4 4 Required characteristics, inspection and test methods 7 5 Quality assurance 10 6 Acceptance conditions .12 7 Packaging .12 8 Certificate of compliance 12 Annex A (normative) Testing of permissible and ultimate
8、 static loads .15 A.1 Permissible radial static loads (Cs) 15 A.2 Ultimate radial static loads .15 A.3 Permissible axial static loads (Ca) 16 A.4 Ultimate axial static loads .17 Annex B (normative) Testing of permissible radial dynamic loads (C25) .19 B.1 Principle 19 B.2 Method 19 Annex C (normativ
9、e) Fluids Essential characteristics 21 C.1 Fuel for turbine aero engine .21 C.2 Fluids for de-icing circuit 21 C.3 Hydraulic fluids 21 C.4 De-icing and anti-icing fluids 21 Annex D (normative) Resistance of the liner to peeling 22 D.1 Principle 22 D.2 Method 22 Annex E (normative) Measurement of fri
10、ction coefficient for EN 4534-2, EN 4535-2, EN 4536-2 and EN 4537-2 (for inch size only) .23 E.1 Principle 23 E.2 Starting torque under load C25 at room temperature 23 Annex F (informative) Permissible unit pressure .25 Annex G (informative) Standard evolution form 26 Foreword This standard was revi
11、ewed 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 Manual, this standard has received approval for Publication. prEN 2311:2015 (E) 3 1 Scope This standard specifi
12、es the required characteristics, inspections and tests, quality assurance and qualification, acceptance and delivery conditions for bushes, designed to be subjected under load, to slow sliding movements, rotations and small oscillations only for aerospace applications. This standard applies to all b
13、ushes when referred to in the respective product standards or in a design documentation. The liner is designed to be used in the temperature range of 50 C to 163 C. Aluminium bushes are limited to 55 C to 121 C. 2 Normative references The following documents, in whole or in part, are normatively ref
14、erenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 2285, Aerospace series Bushes plain, aluminium alloy, with self-lubri
15、cating liner Dimensions and loads EN 2286, Aerospace series Bushes flanged, aluminium alloy, with self-lubricating liner Dimensions and loads EN 2287, Aerospace series Bushes, plain, corrosion resisting steel, with self-lubricating liner Dimensions and loads EN 2288, Aerospace series Bushes, flanged
16、, corrosion resisting steel, with self-lubricating liner Dimensions and loads EN 2755, Aerospace series Bearings spherical plain, in corrosion resisting steel with self-lubricating liner Elevated loads at ambient temperature Technical specification EN 4534-2, Aerospace series Bushes, plain in alumin
17、ium alloy with self-lubricating liner, elevated load Part 2: Dimensions and loads Inch series EN 4535-2, Aerospace series Bushes, flanged in aluminium alloy with self-lubricating liner, elevated load Part 2: Dimensions and loads Inch series EN 4536-2, Aerospace series Bushes, plain in corrosion resi
18、sting steel with self-lubricating liner, elevated load Part 2: Dimensions and loads Inch series EN 4537-2, Aerospace series Bushes, flanged in corrosion-resisting steel with self-lubricating liner, elevated load Part 2: Dimensions and loads Inch series EN 9100, Quality Management Systems Requirement
19、s for Aviation, Space and Defence Organizations EN 9133, Aerospace series Quality management systems Qualification procedure for aerospace standard parts EN 10204, Metallic products Types of inspection documents EN ISO 8785, Geometrical Product Specification (GPS) Surface imperfections Terms, defini
20、tions and parameters ISO 11078, Aircraft De-icing/anti-icing fluids ISO types II, III and IV prEN 2311:2015 (E) 4 TR 4475, Aerospace series Bearings and mechanical transmissions for airframe applications Vocabulary 1) 3 Terms and definitions For the purpose of this standard the terms and definitions
21、 given in TR 4475 and the following definitions apply. 3.1 bushes with self-lubricating liner ring in corrosion resisting steel or aluminium alloy with a self-lubricating liner bonded to the bore Note 1 to entry: With regards to flanged bushes the self-lubricating material is bonded to the outer fac
22、e of the flange as well as the bore. 3.2 loads 3.2.1 permissible static load CS or permissible static axial load Ca (flanged bushes only) is the maximum permissible load (without safety factor), which can be applied statically Note 1 to entry: It is defined as a unit pressure multiplied by the effec
23、tive projected area (radial or axial) for deformations that are compatible with correct operational behaviour. 3.2.2 ultimate static load (radial or axial) 1,5 times the value of the permissible static load Note 1 to entry: It is defined as being the highest load the bush will support without failur
24、e occurring. 3.2.3 permissible dynamic radial load C25 the load that a bush can withstand, when subjected to an oscillating motion for 25 000 cycles at the rate of (12 2) cycles/min 1) Published as ASD-STAN Technical Report at the date of publication of this standard. http:/www.asd-stan.org/ prEN 23
25、11:2015 (E) 5 3.2.4 cycle angular displacement of the shaft in relation to the lined bush of 0 to 25, then of 25 to 25 and finally 25 to 0, see Figure 1 Figure 1 Cycle 3.3 friction torque under load at ambient temperature The coefficient of friction is calculated as follows: RC T 25where is the coef
26、ficient of friction; T is the dynamic rotational torque under load, expressed in Newton meters (Nm); R is the radius of shaft, expressed in metres (m); C25 is the dynamic radial load, expressed in Newton (N). 3.4 surface discontinuities 3.4.1 crack linear recession with a sharp bottom resulting from
27、 a disturbance of the integrity of the surface, and of the parent material of the workpiece SOURCE: EN ISO 8785, modified: figure not included 3.4.2 scratch score surface imperfection which is a recession of irregular shape and unspecified direction SOURCE: EN ISO 8785, modified: synonym “score“ add
28、ed, figure not included prEN 2311:2015 (E) 6 3.4.3 lap tongue-like raising of small thickness, often in the form of a seam, caused by folding over of material and forcing it into the surface when rolling, forging etc. SOURCE: EN ISO 8785, figure not included 3.4.4 seam non-welded fold which appears
29、as an open defect in the material 3.5 void an area where the adhesive bond is broken or non-existent leaving a smooth and clean area on the metallic surface Note 1 to entry: Used in context of adhesion of the liner. 3.6 delivery batch consists of bushes bearing the same identity block although they
30、may originate from different manufacturing batches prEN 2311:2015 (E) 7 4 Required characteristics, inspection and test methods According to Table 1. Table 1 Required characteristics, inspection and test methods (1 of 4) Clause Characteristics Requirements Inspection and test method Q a A a 4.1 Mate
31、rials In accordance with the product standards or design documentation Chemical analysis and physical properties or a certificate of compliance according to EN 10204, 3.1B issued by the semi-finished product manufacturer. X X 4.2 Dimensions and tolerances In accordance with the product standards or
32、design documentation Suitable measuring instruments Measurement of the bore b and of the outer diameter Rings having a width of 10 mm: in two planes parallel to the outer faces and placed at a distance from these faces twice the maximum chamfer value of these rings. Measurement of widths of rings: A
33、 minimum four point check on the width of each ring (distance between the two faces). X X 4.3 Masses In accordance with the product standards or design documentation Suitable methods X 4.4 Marking In accordance with the product standards or design documentation Visual examination X X prEN 2311:2015
34、(E) 8 Table 1 Required characteristics, inspection and test methods (2 of 4) Clause Characteristics Requirements Inspection and test method Q a A a 4.5 Surface appearance The bushes shall be free of surface discontinuities liable to have a detrimental effect on the characteristics and durability. Th
35、e liner shall not contain contaminant products and shall not show broken or voided areas. No lubrication allowed. Visual monitoring using appropriate procedures. X X 4.6 Surface roughness Shall conform to product standards Suitable measuring instruments or visual tactile samples. X X 4.7 Static load
36、s: Shall conform to product standards According to Annex A. X radial: Cs With permissible static loads no maximum total deformations greater than those indicated in Table A.1. axial: Ca After removal of the loads, no permanent deformations greater than those indicated in Table A.1. 4.8 Ultimate load
37、s radial axial After removal of the loads, no rupture, or crack. According to Annex A. X 4.9 Dynamic load and friction coefficient X 4.9.1 Dynamic radial load C25 Shall conform to product standards. After removal of the loads: These shall be: According to Annex B. at ambient temperature no metal to
38、metal contact between the shaft and bush. at low temperature wear of the liner shall not exceed the values indicated in Table B.1. at high temperature liners resistance to peeling and adhesion shall meet the requirements of 4.11 and 4.12. prEN 2311:2015 (E) 9 Table 1 Required characteristics, inspec
39、tion and test methods (3 of 4) Clause Characteristics Requirements Inspection and test method Q a A a 4.9.2 Friction coefficientc After dynamic test and before removal of load, torque to rotate shaft shown in Figure B.1 shall be measured and the value of calculated. The value shall not exceed 0,05 a
40、t ambient temperature According to Annex E. 4.10 Compatibility between the liner and fluids The bushes shall meet the requirements of 4.9 at ambient temperature after immersion in the specified fluids. Wear of the liner shall not exceed the values indicated in Table B.1. Check one bush per fluid: th
41、e bush shall be immersed for 24 h in the fluids stated in Annex C at the following temperatures: (45 3) C for those defined in C.1 and C.2, (70 3) C for those defined in C.3, ambient temperature for those defined in C.4. Within h after this test, proceed to the test defined in B.2.4. X 4.11 Resistan
42、ce of the liner to peeling The requirements of this test shall only be applied when there is an indication from the manufacturer that the liner is susceptible to peeling. Bushes smaller than 15 mm diameter shall be exempt from this requirement. It shall present a mean peeling resistance of 0,35 N/mm
43、 of width of the outer ring reduced by 2 mm to eliminate the effects of edges and chamfers. Mean resistance shall be such that at least 75 % of the recording curve lies above 0,35 N/mm. According to Annex D. For acceptance, this test shall be carried out immediately after assembly and curing. X X pr
44、EN 2311:2015 (E) 10 Table 1 Required characteristics, inspection and test methods (4 of 4) Clause Characteristics Requirements Inspection and test method Q a A a 4.12 Bond integrity For peelable liners, the liner: According to Annex D. X X Shall not contain any contamination substances. Shall adhere
45、 tightly to the outer ring over at least 90 % of the contact area. No void shall be allowed which cannot be described within a circle of diameter equal to: 25 % of outer ring width; 6 mm. whichever is smaller. After the peel strength test, evaluate the location and size of any voids. For non-peelabl
46、e liners, a sectioned bush shall be examined for bond integrity. The liner: Shall adhere tightly to the outer ring over at least 90 % of the contact area. No void shall be allowed which cannot be circumscribed within a circle of diameter equal to: 25 % of outer ring width; 6 mm. whichever is smaller
47、. Destructively examine the liner by chipping, scraping, abrasion, or other appropriate means to determine the bond integrity. X X 4.13 Surface treatment In accordance with the product standard or design documentation Visual examination X X a Q: Qualification test; A: Acceptance test. b Measurement
48、of the bore could be carried out by “Go“ and “NoGo“ plug gauges. c Not applicable for the standards: EN 2285, EN 2286, EN 2287 and EN 2288. 5 Quality assurance 5.1 Manufacturers approval According to EN 9100. prEN 2311:2015 (E) 11 5.2 Product qualification According to EN 9133 and Table 3. The manuf
49、acturer shall obtain qualification for each set of bushes for each material and for dimensions indicated in the standards referred to in Clause 2 and Table 3. The below references dynamic testing only, see Table 2. Table 2 Dynamic testing only Qualification groups I II III Diameter code size. 06 08 10 12 15 16 18 20 22 25
