SIST EN 1337-2:2004
(Main)Structural bearings - Part 2: Sliding elements
Structural bearings - Part 2: Sliding elements
This European Standard specifies the characteristics for the design and manufacture of sliding elements and guides which are not structural bearings but only parts of them for combination with structural bearings as defined in other Parts of this European Standard.
Suitable combinations are shown in Table 1 of EN 1337-1:2000.
Sliding surfaces with a diameter of the circumscribing circle of single or multiple PTFE sheets less than 75 mm or greater than 1500 mm, or with effective bearing temperatures less than -35°C or greater than 48°C are outside the scope of this European Standard.
Sliding elements for use as temporary devices during construction, for example during launching of the superstructure, are also outside the scope of this European Standard.
In this standard the specification is also given for curved sliding surfaces which are not part of separate sliding elements but which are incorporated in cylindrical or spherical PTFE bearings as per EN 1337.
NOTE The general principles detailed in this European Standard may be applied for sliding elements outside this scope, but their suitability for the intended use should be proven.
Lager im Bauwesen - Teil 2: Gleitteile
Diese Europäische Norm legt Angaben für Bemessung und Herstellung von Gleitteilen und Führungen fest, die keine Lager, sondern nur Teile von solchen sind, für die Kombination mit Lagern, die in anderen Teilen dieser Norm geregelt sind.
Geeignete Kombinationen sind in EN 1337-1:2000, Tabelle 1 angegeben.
Gleitflächen aus ein- oder mehrteiligen PTFE-Platten, deren umschreibender Kreis einen Durchmesser von weniger als 75 mm oder mehr als 1500 mm hat oder deren wirksame Lagertemperatur niedriger als - 35 °C oder höher als 48 °C ist, liegen außerhalb des Anwendungsbereichs dieser Norm.
Gleitelemente, die vorübergehend als Hilfslager während der Bauphase dienen (z. B. beim Taktschieben des Überbaus), liegen außerhalb des Anwendungsbereichs dieser Norm.
In dieser Norm sind auch Angaben für gekrümmte Gleitflächen enthalten, die nicht Teile von separaten Gleitteilen sind, sondern die in Kalotten- und Zylinderlagern nach EN 1337-7 eingebaut werden.
ANMERKUNG Die in dieser Europäischen Norm beschriebenen Grundsätze dürfen für Gleitelemente angewendet werden, die außerhalb dieses Anwendungsbereiches liegen, jedoch ist deren Brauchbarkeit für den vorgeschriebenen Verwendungszweck nachzuweisen.
Appareils d'appui structuraux - Partie 2: Éléments de glissement
Konstrukcijska ležišča - 2. del: Drsni elementi
General Information
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Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Lager im Bauwesen - Teil 2: GleitteileAppareils d'appui structuraux - Partie 2: Éléments de glissementStructural bearings - Part 2: Sliding elements91.010.30Technical aspectsICS:Ta slovenski standard je istoveten z:EN 1337-2:2004SIST EN 1337-2:2004en01-junij-2004SIST EN 1337-2:2004SLOVENSKI
STANDARDSIST EN 1337-2:20011DGRPHãþD
SIST EN 1337-2:2004
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 1337-2March 2004ICS 91.010.30Supersedes EN 1337-2:2000English versionStructural bearings - Part 2: Sliding elementsAppareils d'appui structuraux - Partie 2: Eléments deglissementLager im Bauwesen - Teil 2: GleitteileThis European Standard was approved by CEN on 2 January 2004.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Central Secretariat or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2004 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 1337-2:2004: ESIST EN 1337-2:2004
EN 1337-2:2004 (E)2ContentspageForeword.3Introduction.41Scope.52Normative references.53Terms and definitions, symbols and abbreviations.64Functional requirements.95Material properties.116Design requirements.177Manufacturing, assembly and tolerances.288Conformity evaluation.319Installation.3410Criteria for in-service inspection.34Annex A (informative)
Reduced area for sliding elements.35Annex B (informative)
Coefficient of friction for dimpled PTFE sheets.37Annex C (informative)
Method for calculating the deformation of backing plates attached to concrete.38Annex D (normative)
Test methods for friction.39Annex E (normative)
Hard chromium plated surfaces - Ferroxyl test.50Annex F (normative)
Thickness measurement of the anodized surfaces.52Annex G (normative)
Lubricant - Oil separation test.54Annex H (normative)
Oxidation stability of lubricant.57Annex J (normative)
Austenitic steel sheets adhesive - Lap shear test.63Annex K (normative)
Factory Production Control (FPC).66Annex L (informative)
Audit testing.69Bibliography.70SIST EN 1337-2:2004
EN 1337-2:2004 (E)3ForewordThis document (EN 1337-2:2004) has been prepared by Technical Committee CEN /TC 167, "Structural bearings",the secretariat of which is held by UNI.This European Standard shall be given the status of a national standard, either by publication of an identical text orby endorsement, at the latest by September 2004, and conflicting national standards shall be withdrawn at thelatest by September 2004.This document supersedes EN 1337-2:2000.This European Standard EN 1337 “Structural bearings”, consists of the following 11 Parts:Part 1: General design rulesPart 2: Sliding elementsPart 3: Elastomeric bearingsPart 4: Roller bearingsPart 5: Pot bearingsPart 6: Rocker bearingsPart 7: Spherical and cylindrical PTFE bearingsPart 8: Guide bearings and restrain bearingsPart 9: ProtectionPart 10: Inspection and maintenancePart 11: Transport, storage and installationAnnexes A, B, C and L are informative. Annexes D, E, F, G, H, J and K are normative.According to the CEN/CENELEC Internal Regulations, the national standards organizations of the followingcountries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark,Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.SIST EN 1337-2:2004
EN 1337-2:2004 (E)4IntroductionThis standard considers a minimum operating temperature of –35°C.An extension down to –40°C will be considered in a future amendment.Applications beyond the range of temperature given in clause 1 need special consideration not covered by thisstandard. Characteristics and requirements given in this standard do not apply in such cases.SIST EN 1337-2:2004
EN 1337-2:2004 (E)51 ScopeThis European Standard specifies the characteristics for the design and manufacture of sliding elements andguides which are not structural bearings but only parts of them for combination with structural bearings as definedin other Parts of this European Standard.Suitable combinations are shown in Table 1 of EN 1337-1:2000.Sliding surfaces with a diameter of the circumscribing circle of single or multiple PTFE sheets less than 75 mm orgreater than 1500 mm, or with effective bearing temperatures less than –35°C or greater than 48°C are outside thescope of this European Standard.Sliding elements for use as temporary devices during construction, for example during launching of thesuperstructure, are also outside the scope of this European Standard.In this standard the specification is also given for curved sliding surfaces which are not part of separate slidingelements but which are incorporated in cylindrical or spherical PTFE bearings as per EN 1337.NOTEThe general principles detailed in this European Standard may be applied for sliding elements outside this scope,but their suitability for the intended use should be proven.2 Normative referencesThis European Standard incorporates by dated or undated reference, provisions from other publications. Thesenormative references are cited at the appropriate places in the text and the publications are listed hereafter. Fordated references, subsequent amendments to or revisions of any of these publications apply to this EuropeanStandard only when incorporated in it by amendment or revision. For undated references the latest edition of thepublication referred to applies (including amendments).EN 1337-1:2000, Structural bearings - Part 1: General design rulesEN 1337-7, Structural bearings - Part 7: Spherical and cylindrical PTFE bearingsEN 1337-10:2003, Structural bearings - Part 10: Inspection and maintenanceEN 1337-11:1997, Structural bearings - Part 11: Transport, storage and installationEN 10025, Hot rolled products of non-alloy structural steels –Technical delivery conditionsEN 10088-2, Stainless steels – Part 2: Technical delivery conditions for sheet/plate and strip for general purposesEN 10113-1, Hot-rolled products in weldable fine grain structural steels - Part 1: General delivery conditionsEN 10137-1, Plates and wide flats made of high yield strength structural steels in the quenched and tempered orprecipitation hardened conditions – Part 1: General delivery conditionsEN 10204, Metallic products - Types of inspection documentsENV 1992-1-1, Eurocode 2: Design of concrete structures - Part 1-1: General rules and rules for buildingsENV 1993-1-1, Eurocode 3: Design of steel structures - Part 1-1: General rules and rules for buildingsEN ISO 527-1, Plastics – Determination of tensile properties – Part 1: General principles (ISO 527-1:1993 includingCorr 1:1994)EN ISO 527-3, Plastics – Determination of tensile properties – Part 3: Test conditions for films and sheets (ISO527-3:1995)SIST EN 1337-2:2004
EN 1337-2:2004 (E)6EN ISO 1183 (all Parts), Plastics - Methods for determining the density of non-cellular plasticsEN ISO 2039-1, Plastics - Determination of hardness - Part 1: Ball indentation method (ISO 2039-1:2001)EN ISO 2409, Paints and varnishes - Cross-cut-test (ISO 2409:1992)EN ISO 4287, Geometrical product specifications (GPS) – Surface textute: Profile method – Terms, definitions andsurface texture parameters (ISO 4287:1997)EN ISO 6506 (all Parts), Metallic materials – Brinell hardness testEN ISO 6507-1, Metallic materials – Vickers hardness test - Part 1: Test method (ISO 6507-1:1997)EN ISO 6507-2, Metallic materials - Vickers hardness test - Part 2: Verification of testing machines (ISO 6507-2:1997)ISO 1083, Spheroidal graphite cast iron - ClassificationISO 2137, Petroleum products - Lubricating grease and petrolatum - Determination of cone penetrationISO 2176, Petroleum products - Lubricating grease - Determination of dropping pointISO 3016, Petroleum products - Determination of pour pointISO 3522, Cast aluminium alloys - Chemical composition and mechanical propertiesISO 3755, Cast carbon steels for general engineering purposes prEN ISO 6158, Metallic coatings - Electrodeposited coatings of chromium for engineering purposes (ISO/DIS6158:2002)3 Terms and definitions, symbols and abbreviations3.1 Terms and definitionsFor the purposes of this European Standard, the following terms and definitions apply.3.1.1backing platemetallic component which supports sliding materials3.1.2coefficient of frictionratio of lateral force (resisting force Fx) to the normal force Fz3.1.3composite materialsliding material used in guides3.1.4guidesliding element which restrains a sliding bearing from moving in one axis3.1.5hard chromium surfacesteel backing element plated with a hard chromium layer3.1.6lubricantspecial grease used to reduce the friction and wear in the sliding surfaces3.1.7mating surfacehard smooth metallic surface against which the PTFE or composite materials slideSIST EN 1337-2:2004
EN 1337-2:2004 (E)73.1.8polytetrafluoroethylene (PTFE)a thermoplastic material used for its low coefficient of friction3.1.9sliding surfacecombination of a pair of flat or curved surfaces of different materials which allow relative displacements3.1.10sliding materialsmaterials which form sliding surfaces3.2 SymbolsThe most frequently occurring symbols are defined below. Those that are local, and unique to a particular clause,are defined at their first appearance.3.2.1 Latin upper casesAcontact area of sliding surface.mm2Emodulus of elasticity .GPaFaction; force .N; kNGpermanent action .N; kNLdiameter of the circumscribing circle of single or multiplePTFE sheets (see Figures 3, 4 and 5); length of PTFE orcomposite materials sheets of guides (see Figure 6) .mmMbending moment .N x mm; kN x mNaxial force; force normal to principal bearing surface .N; kNRy5iaverage surface roughness .mmSshape factorTtemperature .°CVtransverse or shear force .N; kN3.2.2 Latin lower case lettersasmallest dimension of PTFE sheets;.mmminor side of rectangular plates or sheets .mmbmajor side of rectangular plates or sheets .mmcclearance between sliding components (difference in width between keyand keyway).mmddiameter, diagonal .mmeeccentricity .mmfnominal compressive strength .MPahprotrusion of PTFE sheet from its recess.mmnnumber of cyclesssliding distance .mmtthickness, time .mm; s; huperimeter of PTFE sheet.mmvsliding speed .mm/sSIST EN 1337-2:2004
EN 1337-2:2004 (E)8wdeformationxlongitudinal axisytransverse axiszaxis normal to the principle bearing surface3.2.3 Greek lettersaangle.radgpartial safety factordelongation at break .%Dzmaximum deviation of plane or curved slidingsurfaces from theoretical surface .mmlratio, coefficientmcoefficient of frictionm1initial coefficient of friction; i.e. the maximum coefficient of friction occurring during the first movementat the start or restart of any testmTmaximum coefficient of friction during a given temperature phasermass density .kg/m3snormal pressure .MPa3.2.4 Subsciptsaaveragebbacking platecconcreteCMcomposite materialsddesigndyndynamicGpermanent actionggeometricalkcharacteristicMmaterialmaxmaximumminminimumncycle numberpPTFEplpreloadQvariable actionRresistancerreducedSinternal forces and moments from actionssstaticttensionTtemperatureSIST EN 1337-2:2004
EN 1337-2:2004 (E)9uultimatex, y, zcoordinates3.3 AbbreviationsCMComposite MaterialPTFEPolytetrafluoroethyleneNDPNationally Determined Parameters4 Functional requirementsNOTESliding elements and guides permit movements in plane or curved sliding surfaces with a minimum of friction.Specific verification of frictional resistance is required, as verification of mechanical and physical properties alone is notsufficient to ensure that these components will have the required characteristics. The performance of the sliding elements andguides is deemed to be satisfactory if standardized specimens shown in annex D of specified material combinations meet therequirements of this clause when tested as specified in specific friction tests described in annex D.4.1 Sliding elements and guides incorporating sliding surfaces with PTFE sheets4.1.1 Requirements in short term friction testsThe coefficients of friction in each phase of friction testing shall not exceed the values given in Table 1.Table 1 — Maximum coefficients of friction in short term tests of PTFE sheets in combination with hardchromium plating, austenitic steel or aluminium alloy used for curved or plane sliding surfacesTestSee annex DTemperatureHard chromium oraustenitic steelAluminiumalloyms,1mdyn,1ms,Tmdyn,Tms,1mdyn,1ms,Tmdyn,TC+ 21 °C0,0120,005--0,0180,008--D- 35 °C0,0350,025--0,0530,038--E0 °C0,0180,012--0,0270,018--E- 35 °C--0,0180,012--0,0270,018NOTE ms,1 is the static coefficient of friction at the first cycle.mdyn,1 is the dynamic coefficient of friction at the first cycle.ms,T is the static coefficient of friction at subsequent cycles.mdyn,T is the dynamic coefficient of friction at subsequent cycles.(see also annex D, Figures D.4 and D.6)4.1.2 Requirements in long term friction testsThe coefficients of friction of the sliding material combinations shall not exceed the values listed in Tables 2 and 3.4.2 Guides incorporating composite materials CM1 and CM24.2.1 Requirements in short term friction testThe maximum static or dynamic coefficient of friction of the composite materials in combination with austenitic steelshall not exceed 0,15.SIST EN 1337-2:2004
EN 1337-2:2004 (E)10Table 2 — The coefficients of friction in long term tests of PTFE sheets in combination with austenitic steelused for plane sliding surfacesTemperatureTotal slide path5 132 m10 242 mms,Tmdyn,Tms,Tmdyn,T-35°C0,0300,0250,0500,040-20°C0,0250,0200,0400,0300°C0,0200,0150,0250,020+21°C0,0150,0100,0200,015NOTEms,T and mdyn,T are the static and dynamic coefficient of friction respectively at the relevanttemperatures.Table 3 — Maximum coefficients of friction in long term tests of PTFE sheets in combination with hardchromium plating, austenitic steel or aluminium alloy used for curved sliding surfacesTemperatureTotal slide path 2 066 mAustenitic steel or hard chromiumAluminium alloyms,Tmdyn,Tms,Tmdyn,T-35°C0,0300,0250,0450,038-20°C0,0250,0200,0380,0300°C0,0200,0150,0300,022+21°C0,0150,0100,0220,0154.2.2 Requirements in long term friction testMaximum static or dynamic coefficients of friction shall not exceed the values listed in Table 4.SIST EN 1337-2:2004
EN 1337-2:2004 (E)11Table 4 — Maximum static or dynamic coefficients of friction mT in long term tests of composite materialCM1 and CM2 in combination with austenitic steel used for plane sliding surfaces in guidesTemperatureTotal slide path 2 066 mmT-35°C0,200-20°C0,1500°C0,100+21°C0,0755 Material properties5.1 GeneralIn the absence of specific standards, material testing shall be in accordance with the procedures given in annexesD to H.5.2 PTFE sheets5.2.1 Material specificationThe raw material for PTFE sheets shall be pure polytetrafluoroethylene free sintered without regenerated or fillermaterials.5.2.2 Mechanical and physical propertiesThe characteristics of PTFE shall be in accordance with Table 5.Table 5 — Mechanical and physical properties of PTFEPropertyTesting StandardRequirementmass densityEN ISO 1183 (all Parts)rp = 2140 to 2200kg/m3tensile strengthEN ISO 527-1 and -3fptk = 29 to 40 MPaelongation at breakEN ISO 527-1 and -3dp ³ 300%ball hardnessEN ISO 2039-1H132/60 = 23 to 33 MPaThe test specimens shall be prepared from fully finished sheet but without impressed dimples. They shall be testedat 23°C ± 2°C.Mass density shall be determined on three specimens.SIST EN 1337-2:2004
EN 1337-2:2004 (E)12Tensile strength test and elongation at break shall be conducted on five specimens type 5 (in accordance withFigure 1 of EN ISO 527-3). The thickness of the specimens shall be 2 mm ± 0,2 mm and the speed of testing shallbe 50 mm/min (speed as defined in EN ISO 527-1).A total of 10 ball hardness tests shall be conducted using at least three specimens with a minimum of three testsper specimen; the thickness of the specimens shall be at least 4,5 mm.All specimens shall pass all the tests conducted on them.5.2.3 Geometrical properties5.2.3.1 Tolerance on thicknessThe admissible tolerance on thickness of single PTFE sheets or associated multiple sheets is mm0,30+ for sheetswith a diameter L less than 1200 mm and mm0,40+ for larger sheets.5.2.3.2 Dimple patternDimples and dimple pattern shall be in accordance with Figure 1.Where dimples are produced by hot pressing, the temperature during the pressing process shall not exceed 200°C.Dimensions in millimetresKey1Main direction of slidingFigure 1 — Pattern of dimples in recessed PTFE sheetsSIST EN 1337-2:2004
EN 1337-2:2004 (E)135.2.4 Suitability as sliding materialPTFE shall be tested in accordance with annex D and shall meet the requirements of 4.1.1 and 4.1.2.Lubricant shall be in accordance with 5.8.The mating surfaces for the short term friction test shall be austenitic steel or hard chromium and for the long termfriction test austenitic steel in accordance with 5.4 and 5.5.5.3 Composite materials5.3.1 Composite material CM1This is a composite material consisting of three layers: a bronze backing strip and a sintered interlocking porousmatrix, impregnated and overlaid with a PTFE / lead mixture.The material shall conform to the characteristics listed in Table 6.In addition, the condition of the material and its surface finish shall be checked visually.Table 6 — Characteristics of CM1Bronze backingmaterial: CuSn 6composition by massSn5 to 7,50%P£0,35%Pb£0,10%Fe£0,10%Zn + Ni£0,50%others£0,30%remainder Cuthickness(2,1 ± 0,15)mmhardness HB - EN ISO 6506(all Parts)80 to 160Bronze interlayermaterial: CuSn 10composition by massSn10 to 12%Pb£1,00%P0,25 to 0,4%Si£0,17%Fe£0,15%Ni£0,15%others£0,50%saturation with PTFE - Pb³25%thickness0,0+0,15 0,25mmComposite materialsurface layermaterial: PTFE+Pbcomposition by massPb 49 to 62%, remainder PTFEthickness0,0+0,02 0,01mmtotal thickness0,0152,48±mmoverlay adhesion - EN ISO2409minimum GT 2SIST EN 1337-2:2004
EN 1337-2:2004 (E)145.3.2 Composite material CM2The material shall consist of a flexible metal mesh which is sintered into a PTFE compound with the bearing orsliding surface having the thicker PTFE coat.The metal mesh shall be CuSn6 stabilised mesh from 0,25 mm diameter wires which are linked at intersections andwhich has a thickness after calendering of approximately 0,4 mm. The mesh count in warp and weft direction shallbe 16 ± 1 per 10 mm.The PTFE compound shall be PTFE with 30% ± 2% filler content, consisting of glass fibres and graphite.The material is to conform to the characteristics listed in Table 7.In addition, the condition of the material and its surface finish shall be checked visually.Table 7 — Characteristic of CM2Density4100 kg/m3 to 4400 kg/m3Tensile strength> 45 MPaElongation> 10%Thickness(0,48 ± 0,02) mmOverlay adhesion (in accordance with ENISO 2409)minimum GT25.3.3 Suitability as sliding materialComposite materials CM1 and CM2 shall be tested in accordance with annex D and shall meet the requirements of4.2.1 and 4.2.2.The mating austenitic steel sheet and the lubricant to be used in the test shall both be in accordance with thisEuropean Standard.5.4 Austenitic steel sheet5.4.1 Material specificationSteel in accordance with EN 10088-2
1.4401 + 2B or 1.4404 + 2B shall be used.The contact surface shall be ground and if necessary machine polished.5.4.2 Surface characteristicsAfter the surface treatment the roughness Ry5i shall not exceed 1 mm in accordance with EN ISO 4287 and thehardness shall be in the range 150 HV1 to 220 HV1, according to EN ISO 6507-2.5.5 Hard chromium plated surfaces5.5.1 GeneralThe entire curved surface of the backing plate shall be hard chromium plated.The hard chromium plating process shall comply with the requirements of prEN ISO 6158.SIST EN 1337-2:2004
EN 1337-2:2004 (E)155.5.2 Material specificationThe substrate for hard chromium plated sliding surfaces shall be steel in accordance with EN 10025 grade S 355J2G3 or fine grain steel of the same or higher grade in accordance with EN 10113-1.Hard chromium plating shall be free from cracks and pores.The surface of the base material shall be free from surface porosity, shrinkage cracks and inclusions.Small defects may be repaired e.g. by pinning prior to hard chromium plating.5.5.3 Surface characteristics5.5.3.1 RoughnessThe final surface roughness Ry5i in accordance with EN ISO 4287 of the plated surface shall not exceed 3 mm.NOTEBoth the base material and hard chromium plating may be polished to achieve the specified surface roughness.5.5.3.2 ThicknessThe thickness of the hard chromium plating shall be at least 100 mm.5.5.3.3 Visual inspectionThe hard chromium surface shall be visually inspected for cracks and pores.5.5.3.4 Ferroxyl testIn addition to the visual inspection, the absence of defects shall be verified by a Ferroxyl test in accordance withannex E.If the visual inspection of the surfaces reveals any potential defects, the Ferroxyl test shall be applied over theentire affected area.If any defects are detected by Ferroxyl test, the hard chrome plating shall be rejected.5.6 Ferrous materials for backing platesSteel plates in accordance with EN 10025 or EN 10137-1, cast iron in accordance with ISO 1083, cast carbon steelin accordance with ISO 3755 or stainless steel in accordance with EN 10088 shall be used for the backing plateswith flat or curved surfaces, as appropriate.5.7 Aluminium alloy5.7.1 Material specification for backing platesAluminium alloy may be used only for the convex element of spherical or cylindrical PTFE bearings.The alloy shall be Al-Mg6M or Al-Si7MgTF in accordance with the requirements of ISO 3522.5.7.2 Surface treatmentThe curved surface shall be anodized after machining.The minimum average thickness of the coating shall be 15 mm.The minimum local thickness of the coating shall be 14 mm.Thickness measurements shall be carried out according to the method described in annex F.The surface may be polished if necessary to achieve the finish required in 5.7.3.SIST EN 1337-2:2004
EN 1337-2:2004 (E)165.7.3 Characteristics of sliding surfacesThe surface roughness Ry5i after anodizing shall not exceed 3 mm in accordance with EN ISO 4287.The surface shall be free from injurious defects, such as cracks and significant porosity.5.7.4 Suitability as sliding materialAluminium alloy shall be tested in accordance with annex D and meet the requirements of 4.1.5.8 LubricantNOTEThe purpose of the lubricant is to reduce the frictional resistance and wear of the PTFE.5.8.1 General requirementsLubricant shall retain its properties within the specified temperature range and shall not resinify nor attack othermaterials at the sliding interface.5.8.2 PropertiesThe characteristics of lubricant shall be in accordance with Table 8.An IR spectral analysis shall be carried out for the purpose of identification.Table 8 — Physical and chemical properties of lubricantPropertiesTesting standardRequirementsWorked penetrationISO 213726,5 to 29,5mmDropping pointISO 2176³ 180°COil separation after 24 h at 100°Cannex G£ 3
% (mass)Oxidation resistance pressure dropafter 100 h at 160°Cannex H£ 0,1MPaPour-point of base oilISO 3016below –60°C5.8.3 Suitability for use in sliding elementsWhen tested in accordance with annex D, the lubricant shall meet the friction requirements given in 4.1.1 and 4.1.2.For the short term friction test the mating sliding surface shall be made of hard chromium in accordance with 5.5 oraustenitic steel in accordance with 5.4 and for the long term friction test of austenitic steel in accordance with 5.4.5.9 Adhesive for bonding austenitic steel sheetsNOTEThe main function of the adhesive is to join austenitic steel sheets to the backing plate in such a way that shear istransmitted without relative movement.SIST EN 1337-2:2004
EN 1337-2:2004 (E)175.9.1 GeneralThe adhesive shall be solvent free.5.9.2 Requirements in short term testThe short term test shall be carried out in accordance with annex J on five specimens.When tested without ageing, the lap shear strength of the fastening of each specimen shall not be less than 25MPa.5.9.3 Requirements in long term testThe long term test shall be carried out in accordance with annex J on each of the five specimens.When tested after accelerated ageing in accordance with J 4.3.1 and J 4.3.2, the average lap shear strength of thefastening from both sets of five specimens shall not be less than 25 MPa.6 Design requirementsNOTEThis clause deals with all the design d
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