EN 12080:2017

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Železniške naprave - Ohišja ležajev kolesnih dvojic - Kotalni ležajiBahnanwendungen - Radsatzlager - WälzlagerApplications ferroviaires - Boîtes d'essieux - RoulementsRailway applications - Axleboxes - Rolling bearings45.040Materiali in deli za železniško tehnikoMaterials and components for railway engineering21.100.20Kotalni ležajiRolling bearingsICS:Ta slovenski standard je istoveten z:EN 12080:2017SIST EN 12080:2017en,fr,de01-november-2017SIST EN 12080:2017SLOVENSKI
STANDARDSIST EN 12080:2008+A1:20101DGRPHãþD

EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 12080
September
t r s y ICS
t sä s r rä t râ
v wä r v r Supersedes EN
s t r z rã t r r y ªA sã t r s rEnglish Version
Railway applications æ Axleboxes æ Rolling bearings Applications ferroviaires æ Boîtes d 5essieux æ Roulements
Bahnanwendungen æ Radsatzlager æ Wälzlager This European Standard was approved by CEN on
s { June
t r s yä
egulations which stipulate the conditions for giving this European Standard the status of a national standard without any alterationä Upætoædate lists and bibliographical references concerning such national standards may be obtained on application to the CENæCENELEC Management Centre or to any CEN memberä
translation under the responsibility of a CEN member into its own language and notified to the CENæCENELEC Management Centre has the same status as the official versionsä
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Avenue Marnix 17,
B-1000 Brussels
t r s y CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Membersä Refä Noä EN
s t r z rã t r s y ESIST EN 12080:2017

Ultrasonic inspection of rolling bearing rings . 23 Annex B (normative)
Magnetic particle inspection of ring surfaces . 28 Annex C (normative)
Eddy current inspection of the raceways of the rollers . 30 Annex D (normative)
Cages of polymeric material . 33 Annex E (normative)
Approval procedures . 42 Annex F (normative)
Criteria to determine the extent of approval procedures . 44 Annex G (informative)
Examples of axlebox assemblies . 46 Annex ZA (informative)
Relationship between this European Standard and the Essential Requirements of EU Directive 2008/57/EC aimed to be covered. 48 Bibliography . 50
annular part of a rolling bearing incorporating one or more raceways with rolling element contact 3.12 rolling elements
cylindrical, tapered or convex rollers or balls 3.13 cage component, which partly surrounds the rolling elements and moves with them 3.14 grease semi-solid lubricant, which consists of a thickener and additives dispersed in a lubricating oil 3.15 seal
component that protects the bearing(s) against ingress of water and dust and retains the grease in the rolling bearing(s) 3.16 box housing
structural component which contains rolling bearing(s), seal(s) and grease 3.17 rolling bearing type designation of the rolling bearing or cartridge bearing according to the shape of the rolling elements (e.g. tapered roller bearing, cylindrical roller bearing, and spherical roller bearing) SIST EN 12080:2017

¶ 3.0 % with a measuring accuracy of ± 1 %; — 200 °C:
¶ 2.0 % with a measuring accuracy of ± 1 %. For other steels, the retained austenite content must be defined in the course of the (type) approval procedure. The inspection frequency of the retained austenite content is specified in Table 3 — Inspection plan, 12.1. The method of measurement of retained austenite is to be defined in the technical specification
(Clause 4). 6.3 Traceability For the manufacturing process a system of identification and traceability of finished products shall be set up and maintained. This system shall allow identification, of the following elements: — Raw material for rings and rollers; —
Inspection certificate 3.1 in accordance with EN 10204 or equivalent. Minimum content: • Chemical analysis (all elements); • Steel production method; • Microstructure (CN, CG, CZ); • Inclusion content (see 7.2.2); — Polymeric cages: • Raw material (granulate material) + raw material manufacturer; • Inspection results; inspections at least in accordance with EN 12080, Annex D; • Manufacturer, manufacturer's mark, date of manufacture; — Rolling bearing grease: • Name, manufacturer ; • Inspection certificate 3.1 in accordance with EN 10204 or equivalent. The content of the certificate is according to EN 12081. — Production locations of rings and rollers; SIST EN 12080:2017

Steels should be selected from the grades specified in EN ISO 683-17. Alternative steel grades may be used if specified in the technical specification. For particular applications (high rotational speed, SIST EN 12080:2017

Maximum
Ti 0 0.003 H2 0 0.000 2 Table 2 — Additional requirements, chemical composition, case carburised steel Element Minimum
Maximum
Ti 0 0.005 H2 0 0.000 25 7.2.2 Inclusion content
The methods for determining the inclusion content shall be in the technical specification. The methods in accordance with ASTM E45 (Method A) and ISO 4967 (Method A) are permitted. For the methods mentioned above, the limit values in accordance with EN ISO 683-17:2014, Annex A, Tables A.1 and A.2 are authoritative. The frequency and scope of inspection for inclusion content of raw material (bar, tube or billet) is specified in Table 3 — Inspection plan, Clause 12.1). When needed - inspection of single rings and rollers can also be made according to the methods and requirements specified above providing enough samples are taken to form an average value. NOTE ASTM E45 gives a recommendation for number of samples. For steel with special composition, metallurgical quality or manufacturing processes, the inclusion content shall be documented in accordance with Clause 4. 7.3 Materials of other components (cages, spacers, seals etc.) The materials of each one of these components shall be documented in in the technical specification in accordance with Clause 4. For cages of polymeric material, if not otherwise specified, refer to Annex D. 8 Geometry and dimensions 8.1 Dimensions and tolerances The boundary dimensions shall be given in the technical specification, and the applicable tolerances shall be those given in ISO 492, normal tolerance class, unless given and documented in the technical specification in accordance with Clause 4. 8.2 Rolling bearing internal clearance 8.2.1 Rolling bearing clearance before mounting
Rolling bearing internal clearance, axial and/or radial, depending on the type of rolling bearing, shall conform to the values given in the technical specification. The methods for radial and/or axial clearance SIST EN 12080:2017

Rolling bearing clearance after mounting on an axle is a calculated value used for checking the clearance after mounting. The values for clearance after mounting shall be described and documented by the manufacturer in accordance with Clause 4. 9 Mechanical properties — inner ring expanding ability With the exception of case-hardened rings and bainite hardened rings, an expansion test shall be performed to guarantee that the inner rings can withstand an increase of the bore diameter without causing fracture in service. This test shall be performed before the inspection for surface soundness. The value of this diameter increase shall not be less than 0.0015 times the diameter. The rings shall neither rupture nor show any traces of cracks (see 10.2.3). This expansion test shall be made with an expandable mandrel that is inserted in the bore of the inner ring. The expansion shall be achieved progressively in a few seconds. 10 Physical properties 10.1 Visual aspect 10.1.1 Rings and rolling elements Rings and rolling elements shall be free of any defects which can be harmful to their function (such as burrs, scratches, rust stains, nicks and dents). A defect catalogue to define the acceptance limits for visual defects shall be created and maintained. NOTE Usually the manufacturer is responsible for maintaining a defect catalogue. 10.1.2 Cages Rolling bearing cages shall exhibit no defects that might affect their function (such as burrs, scratches, rust). To avoid crack initiation, the connection between the cage bars and the annular body shall be smooth and conform to the rounding-off shown on the detail drawing. The requirements for cages of polymeric material shall be taken into account (see Annex D). For cages other than polymeric cages the approval process shall be defined in the technical specification. Steel riveted brass cages are not allowed. 10.2 Soundness of rings and rolling elements 10.2.1 General rules
Rings and rolling elements shall have no internal defects, nor any form of surface defect that may be harmful to their function. The methods for the soundness inspection are described in Annex A, Annex B and Annex C. Any alternative methods to be used, which give equivalent results, shall be documented in the technical specification in accordance with Clause 4. Two soundness classes are defined: — Class 1 for vehicles with n × dm > 250 000 [mm/min] or a vehicle speed > 200 km/h or axle load
· 25.0t; — Class 2 for vehicles with n × dm
¶ 250 000 [mm/min]. SIST EN 12080:2017

The reference method for the inspection of internal soundness of rings is described in Annex A. Inspection of internal soundness of rings can also be carried out with an approved equivalent, standardized inspection method capable of detecting at least the same defects as the reference method. Use of an equivalent method shall be agreed and documented in in the technical specification in accordance with Clause 4. When tested, no ring shall exhibit defect indications on the raceway, or in a section of 4 [mm] depth below the raceway, with the amplitude equal to or greater than that observed with the master defect corresponding to the soundness class in question in accordance with Annex A. Larger defects are tolerated deeper than this section, though the defect indications shall not be more than twice the amplitude of that observed with the master defect. 10.2.3 Soundness of ring surfaces The reference method for the inspection of surface soundness of rings is described in Annex B. When tested, no evidence of defects shall be observed on any of the ring surfaces. Surface soundness inspection of rings can also be carried out with an approved equivalent, standardized inspection method, e.g. a calibration and test procedure analogous to the eddy current testing of rollers in Annex C. 10.2.4 Soundness of roller raceway surfaces The reference method for the inspection of the raceway surface soundness of rollers is described in Annex C. When tested, no roller shall exhibit defect indications on its raceway with amplitude equal to or greater than that observed with the master defect as defined in Annex C. 10.2.5 Grinding burns There shall be no grinding burns during the different grinding operations. 10.3 Case depth For rolling bearings manufactured of case-hardened steel, the effective depth of the hardened case shall be documented in accordance with Clause 4. The depth of the hardened case is determined as a function of the change in hardness of the transversal cross section of a test piece or a prepared sample. The hardness shall be measured in accordance with EN ISO 6507-1 and EN ISO 2639 or another process agreed and documented in accordance with Clause 4. At this depth, the Vickers hardness shall be at least 550 HV1. Inspection methods other than those described in EN ISO 6507-1 and EN ISO 2639 can be approved during the course of the approval procedure if equivalence is demonstrated. SIST EN 12080:2017

A – Manufacturer code C – Country of origin *) E – Manufacturer code number in
accordance with type approval M – Month or day of manufacture (un-coded
or coded format) *) Y – Year of manufacture, un-coded **)
D – Abbreviation of inner ring ***)
R – Inner ring creep marking F – Front face CH – Chamfer side *) Optional **) For inner rings with bore increments, the year of manufacture shall be followed by the increment marking
(e.g.119.5) ***) Alternatively, the marking can be on the front face Figure 1 — Marking of CRB inner rings 11.3 Marking of cartridge bearings for axleboxes For self-contained cartridge bearings it is sufficient to mark only the outer ring provided that the marking is visible on the exterior of the bearing. Bearings shall be marked (location and format) according to Figure 2 — Marking of cartridge bearings.
Arrows indicate location of marking. Marking format shall be: A C* D EN 12080* class n* MY Z
where (*) is optional and: A – Manufacturer code C – Country of origin
D – Bearing Designation M – Month or day of manufacture
(un-coded or coded format) Y – Year of manufacture (un-coded) Z – Serial number Marking of inner rings is optional for taper roller cartridge bearings (TBU) Figure 2 — Marking of cartridge bearings SIST EN 12080:2017

Marking format shall be: A C* D EN 12080* class n* MY Z
where (*) is optional and: A – Manufacturer code C – Country of origin
D – Bearing Designation M – Month or day of manufacture
(un-coded or coded format) Y – Year of manufacture (un-coded) Z – Serial number Figure 3 — Marking of spherical roller bearings 11.5 Prefix and postfix For a roller bearing with significant deviations with respect to external dimensions that do not require a new approval procedure the designation shall be modified with a prefix or postfix. For example: XLWJP 120x240 – inner ring with smaller bore diameter; manufactured ring has a diameter of only ø119.5 mm instead of ø120.0 mm.
12 Inspection 12.1 Inspection plan If not otherwise documented in accordance with Clause 4 the sampling plan and the number of inspections to be undertaken shall be in accordance with Table 3 — Inspection plan. The results shall be documented. SIST EN 12080:2017
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