Aerospace series - Bearings, airframe rolling, rigid or self-aligning - Technical specification

This standard specifies the required characteristics, inspection and test methods, qualification and acceptance conditions for rigid or self-aligning airframe rolling bearings.

Luft- und Raumfahrt - Flugwerklager Wälzlager, Rillenkugellager oder Pendellager - Technische Lieferbedingungen

Die vorliegende Norm legt die geforderten Eigenschaftenüberprüfung, Prüfverfahren und die Qualifikations- und Annahmebedingungen für Wälzlager oder Pendelkugellager für Flugwerke fest.

Série aérospatiale - Roulements pour structure d’aéronefs, rigides ou à rotule - Spécification technique

La présente Norme Européenne spécifie les caractéristiques requises, les méthodes de contrôle et d'essai, les conditions de qualification et de réception pour des roulements pour structures d’aéronefs, rigides ou à rotule.

Aeronavtika - Ležaji, ležaji letalske šasije, togi ali samoprilagodljivi - Tehnične zahteve

Ta evropski standard določa zahtevane lastnosti, metode pregleda in preskusa ter pogoje za kvalifikacijo in sprejemljivost togih ali samoprilagodljivih ležajev letalske šasije.

General Information

Status
Published
Publication Date
13-Sep-2011
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
31-Aug-2011
Due Date
05-Nov-2011
Completion Date
14-Sep-2011

Relations

Buy Standard

Standard
EN 3280:2011
English language
34 pages
sale 10% off
Preview
sale 10% off
Preview
e-Library read for
1 day

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.]DKWHYHLuft- und Raumfahrt - Flugwerklager Wälzlager, Rillenkugellager oder Pendellager - Technische LieferbedingungenSérie aérospatiale - Roulements pour structure d’aéronefs, rigides ou à rotule - Spécification techniqueAerospace series - Bearings, airframe rolling, rigid or self-aligning - Technical specification49.035Sestavni deli za letalsko in vesoljsko gradnjoComponents for aerospace constructionICS:Ta slovenski standard je istoveten z:EN 3280:2011SIST EN 3280:2011en,fr,de01-oktober-2011SIST EN 3280:2011SLOVENSKI
STANDARDSIST EN 3280:20011DGRPHãþD



SIST EN 3280:2011



EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 3280
May 2011 ICS 49.035 Supersedes EN 3280:1994English Version
Aerospace series - Bearings, airframe rolling, rigid or self-aligning - Technical specification
Série aérospatiale - Roulements pour structure d'aéronefs, rigides ou à rotule - Spécification technique
Luft- und Raumfahrt - Flugwerklager Wälzlager, Rillenkugellager oder Pendellager - Technische Lieferbedingungen This European Standard was approved by CEN on 17 March 2011.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre:
Avenue Marnix 17,
B-1000 Brussels © 2011 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 3280:2011: ESIST EN 3280:2011



EN 3280:2011 (E) 2 Contents Page Foreword .31Scope .42Normative references .43Terms and definitions .54Required characteristics, inspection and test methods .75Quality assurances .96Packaging .97Certificate of conformity . 10Annex A (normative)
Retention test for self-aligning bearing seals and shields . 11Annex B (normative)
Sand and dust test . 13Annex C (normative)
Test on the running behaviour of the bearings, retention of seals and shields at the limit temperatures. 14Annex D (normative)
Verification of running accuracy . 15Annex E (normative)
Verification of internal clearances . 18Annex F (normative)
Verification of permissible and ultimate static loads. 23Annex G (normative)
Lubricants – Essential characteristics . 28Annex H (normative)
Simplified qualification procedure . 29Bibliography . 34SIST EN 3280:2011



EN 3280:2011 (E) 3 Foreword This document (EN 3280:2011) has been prepared by the Aerospace and Defence Industries Association of Europe - Standardization (ASD-STAN). After enquiries and votes carried out in accordance with the rules of this Association, this Standard has received the approval of the National Associations and the Official Services of the member countries of ASD, prior to its presentation to CEN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by November 2011, and conflicting national standards shall be withdrawn at the latest by November 2011. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 3280:1994. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom.
SIST EN 3280:2011



EN 3280:2011 (E) 4 1 Scope This European Standard specifies the required characteristics, inspection and test methods, qualification and acceptance conditions for rigid or self-aligning airframe rolling bearings. 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 document (including any amendments) applies. EN 2063, Aerospace series — Airframe rolling bearings — Technical specifications EN 3045, Aerospace series — Bearings, airframe rolling — Rigid single row ball bearings in steel — Diameter series 0 and 2 — Reduced clearance category — Dimensions and loads EN 3046, Aerospace series — Bearings, airframe rolling — Rigid single row ball bearings in steel, cadmium plated — Diameter series 0 and 2 — Reduced clearance category — Dimensions and loads EN 3047, Aerospace series — Bearings, airframe rolling — Rigid single row ball bearings in corrosion resisting steel — Diameter series 0 and 2 — Reduced clearance category — Dimensions and loads EN 3053, Aerospace series — Bearings, airframe rolling — Single row self-aligning roller bearings in steel — Dimensions and loads EN 3054, Aerospace series — Bearings, airframe rolling — Single row self-aligning roller bearings in steel, cadmium plated — Dimensions and loads EN 3055, Aerospace series — Bearings, airframe rolling — Single row self-aligning roller bearings in corrosion resisting steel — Dimensions and loads EN 3056, Aerospace series — Bearings, airframe rolling — Rigid double row ball bearings in steel — Dimensions and loads EN 3057, Aerospace series — Bearings, airframe rolling — Rigid double row ball bearings in steel, cadmium plated — Dimensions and loads EN 3058, Aerospace series — Bearings, airframe rolling — Rigid double row ball bearings in corrosion resisting steel — Dimensions and loads EN 3281, Aerospace series — Bearings, airframe rolling — Rigid single row ball bearings in steel — Diameter series 8 and 9 — Dimensions and loads EN 3282, Aerospace series — Bearings, airframe rolling — Rigid single row ball bearings in steel, cadmium plated — Diameter series 8 and 9 — Dimensions and loads EN 3283, Aerospace series — Bearings, airframe rolling — Rigid single row ball bearings in corrosion resisting steel — Diameter series 8 and 9 — Dimensions and loads EN 3284, Aerospace series — Bearings, airframe rolling – Rigid single row ball bearings in steel — Diameter series 0 and 2 — Normal clearance category — Dimensions and loads EN 3285, Aerospace series — Bearings, airframe rolling — Rigid single row ball bearings in steel, cadmium plated — Diameter series 0 and 2 — Normal clearance category — Dimensions and loads SIST EN 3280:2011



EN 3280:2011 (E) 5 EN 3286, Aerospace series — Bearings, airframe rolling — Rigid single row ball bearings in corrosion resisting steel — Diameter series 0 and 2 — Normal clearance category — Dimensions and loads EN 3287, Aerospace series — Bearings, airframe rolling — Double row self-aligning ball bearings in steel — Diameter series 2 — Dimensions and loads EN 3288, Aerospace series — Bearings, airframe rolling — Double row self-aligning ball bearings in steel cadmium plated — Diameter series 2 — Dimensions and loads EN 3289, Aerospace series — Bearings, airframe rolling — Double row self-aligning ball bearings in corrosion resisting steel — Diameter series 2 — Dimensions and loads EN 3290, Aerospace series — Bearings, airframe rolling — Single row self-aligning roller bearings in steel — Diameter series 3 and 4 — Dimensions and loads EN 3291, Aerospace series — Bearings, airframe rolling — Single row self-aligning roller bearings in steel, cadmium plated — Diameter series 3 and 4 — Dimensions and loads EN 3292, Aerospace series — Bearings, airframe rolling — Single row self-aligning roller bearings in corrosion resisting steel — Diameter series 3 and 4 — Dimensions and loads EN 4033, Aerospace series — Bearings, airframe rolling — Rigid single row ball bearings
in corrosion resisting steel — Diameter series 8 and 9, reduced internal radial clearance — Dimensions and loads EN 4034, Aerospace series — Bearings, airframe rolling — Double row self-aligning ball bearings with flanged outer ring in corrosion resisting steel, reduced internal radial clearance — Dimensions and loads EN 9100, Quality Management Systems — Requirements for Aviation, Space and Defence Organizations EN 9133, Aerospace series — Quality management systems — Qualification procedure for aerospace standard parts ISO 1132-1:2000, Rolling bearings — Tolerances — Part 1: Terms and definitions 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 rolling bearings, rigid or self-aligning 3.1.1 general these bearings have a full complement of balls or rollers 3.1.2 shielded rolling bearing bearing whose rolling elements and raceways are protected with shields attached to one of the rings and separated from the other by a small space 3.1.3 sealed rolling bearing bearing whose rolling elements and raceways are completely enclosed by seals attached to one of the rings and rubbing on the other SIST EN 3280:2011



EN 3280:2011 (E) 6 3.2 surface discontinuities 3.2.1 crack break in the material which may extend in all directions and be intercrystalline or transcrystalline in character 3.2.2 score, scratch open surface defect 3.2.3 lap surface defect where particles of metal or sharp edges are folded over and then rolled or forged into the surface 3.2.4 seam unwelded fold which appears as an defect in the material 3.3 radial (Kia, Kea) and axial (Sia, Sea) running accuracy see ISO 1132-1:2000 3.4 internal clearances 3.4.1 radial (Gr) total value of possible radial displacements of one ring in relation to the other 3.4.2 axial (Ga) total value of possible axial displacements of one ring in relation to the other 3.4.3 diagonal (Gd) value of total cant of the inner ring in relation to the outer ring 3.5 starting torque at zero load maximum torque required to start the rotation of the outer ring with the inner ring held stationary 3.6 delivery batch batch of bearings with the same identity block, which may come from different production batches SIST EN 3280:2011



EN 3280:2011 (E) 7 4 Required characteristics, inspection and test methods See Table 1. Table 1 Clause Characteristics Requirements Inspection and test methods Q a A b 4.1 Materials In accordance with the product standards or design documentation. Chemical analysis or certificate issued by semi-finished product manufacturer X X 4.2 Dimensions and tolerances In accordance with the product standards or design documentation. Suitable measuring instruments
Measurement of bore and outer diameter: - Rings with a width of ≤ 10 mm: in the centre 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. Measurement 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 In accordance with the product standards or design documentation. Suitable methods X
4.4 Marking In accordance with the product standards or design documentation. It shall be legible and shall not adversely affect the material or the functioning of the bearing. Visual examination X X 4.5
Surface appearance No surface discontinuities liable to have an adverse effect on their characteristics and endurance.
X X 4.5.1
Assembled bearings
Visual inspection using suitable methods
4.5.2
Unassembled rings Magnetic or dye penetrant inspection
4.5.3
Rolling element See 4.5.1. Rolling element must be supplied with certificate of conformity. X X 4.6 Hardness In accordance with the product standards or design documentation. Suitable processes and measuring instruments c
X X 4.7 Surface roughness In accordance with product standards or design documentation. Suitable measuring instruments or
visual-tactile samples c X X 4.8 Surface treatment In accordance with product standards or design documentation. - Visual inspection - As per surface treatment standard X X 4.9 Lubrication At least 80 % of the free space in the bearing shall be charged with the grease specified in the product standards or design documentation (see Annex G). Visual inspection after removal of seals or shields X
Visual inspection during manufacture
X 4.10 Seals (for sealed bearings) and shields (for shielded bearings)
continued SIST EN 3280:2011



EN 3280:2011 (E) 8 Table 1 (concluded) Clause Characteristics Requirements Inspection and test methods Q a
A b
4.10.1 Retention All bearings: - The seals and shields shall be fitted correctly on the outer ring, in such a way that the functioning of the bearing is not affected. Visual inspection X X Self-aligning bearings: - After the test, the seals and shields shall not have loosened or become deformed. See Annex A. 4.10.2
Sealing The seals shall: rub on the inner ring and retain the grease Visual inspection after the rings are manually turned in relation to each other. X X
The seals shall: prevent the penetration of foreign bodies. After the test, the running behaviour of the bearings shall conform with 4.13.1. See Annex B. X
4.10.3
Temperature test After the test, the behaviour shall conform with 4.10.1. See Annex C. X
4.11 Running accuracy: - radial: Kja Kea - axial: Sia Sea In accordance with the product standards or design documentation. See Annex D. X X 4.12 Internal clearances: - radial: Gr - axial: Ga - diagonal: Gd In accordance with the product standards or design documentation. See Annex E. X X 4.13
Behaviour in rotation
4.13.1
At ambient temperature
No tights spots, e.g.: rolling elements catching in the filling slots See Figures F.2 and F.4. X X 4.13.2
At limit temperatures After the test, the mean starting torque shall not exceed 1,5 times the mean of the values recorded before the test. See Annex C. X
No tight spots See Figures F.2 and F.4.
4.14 Starting torques without load In accordance with the product standards or design documentation. Suitable procedures and measuring instruments X X
- Rotate one of the two ring at least four times to distribute the lubricant uniformity
- Measure at least five times the torque gradually applied to the outer ring, with the inner ring held stationary. Just the highest value shall be taken into account
4.15 Permissible static loads:
In accordance with the product standard or design documentation. See Annex F. X
- radial: Cs - axial: Fa max. After removing the loads, there shall be no permanent deformations.
4.16 Ultimate static loads: After the removal of the loads, there shall be no cracks or deterioration of the bearing. See Annex F. X
- radial
- axial a Q: Qualification test. b A: Acceptance test. c This inspection shall be made in the absence of surface treatment, which, for the purpose of qualification, may be removed by a chemical process. SIST EN 3280:2011



EN 3280:2011 (E) 9 5 Quality assurances 5.1 Product qualification See EN 9133 and Table 1 and Table 2. Qualification shall be obtained for each bearing. However, qualification:  for a cadmium plated bearing applies to a non cadmium plated bearing with the same dimensions and of the same type, made of the same material;  is acquired if it has been obtained, for the bearing immediately before and the one immediately after the bearing in question, within the range of bearings indicated in the product standard. To qualify a bearing of a given range, the manufacturer shall provide:  nine bearings if this is the first qualification in this range;  seven bearings for all the other qualifications. 5.2 Acceptance conditions 5.2.1 Inspections and tests to be carried out by the manufacturer The acceptance of a delivery batch shall be in accordance with Table 2. 5.2.2 User’s quality control The user may, on acceptance of a delivery batch, proceed to inspect it by using the inspections specified in Table 2, in full or in part, to ensure that the items conform to the required quality level, and to determine whether the delivery batch is acceptable. This inspection can be carried out in the user’s factory or by special agreement with the manufacturer, in the latter’s factory. 6 Packaging The bearings shall be packaged either individually or in rolls so that they will not be damaged during transportation. They shall be protected against moisture, corrosion, dirt and other harmful substance. The packaging material in contact with the bearing shall provide this protection and be grease-resistant. The following indications shall be affixed to each individual package:  manufacturer’s name and address;  quantity (for rolls);  identity block as defined by the product standards or design documentation;  packaging date;  lubrification date. SIST EN 3280:2011



EN 3280:2011 (E) 10 The following indications at least shall appear on collective packaging:  manufacturer’s name and address;  number of order;  quantity;  identity block as defined by the product standards or design documentation. 7 Certificate of conformity All the bearings supplied in accordance with this standard shall be accompanied by a certificate of conformity from the manufactu
...

Questions, Comments and Discussion

Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.