wear elements - schwartz plasticschwartz-plastic.eu/fileadmin/downloads/broschu__re_englisch.pdf ·...

1www.schwartz-plastic.com

Technical Plasticsfor the lifting and

transporting industry

Rope sheaves

Multi-Wire Sheave

Runner wheels

Outrigger floats

Wear elements

2 www.schwartz-plastic.com

In recent years and decades, machine components made from high quality technical materials have become increasingly important in the manufacture of machinery and equipment. Schwartz was founded in 1924 as the first European manufacturer of non-metallic friction bearings for steel rolling mills. Since then we have become the leading manufacturer of technical plastics and an efficient partner to the industry on the continuously developing field oftechnical plastics.

Our registered trademarks LAMIGAMID®, LAMINEX® and OPTAMID® are the names of our thermo- and duroplast plastics, known all over the world as high quality polymer materials with the following interesting advantages:

Your requirement is our challenge

• lowspecificweight• greatrigidityandhardness• highimpactvalueevenat

lowtemperatures• friction-andwear-resistance• excellentslidingandemergency

runningproperties• corrosionresistance• no,orverylowmoisture

absorption• goodtoverygoodresistanceto

chemicalsandhydrolysis• dimensionalstability• virtuallynolimittothevariety

ofdimensionsandshapes• lowestmaintenance


For the production of lifting, handling and transportation equipment Schwartz Technical Plastics supplies:

Areas of application:

Plastic machine parts and their areas of application

Building cranes

Bridge cranes• Overheadandother

travellingcranes

Deck cranes

Cranes for Installation on vehicles• Railway-cranes• Latticemastcranes• mobileportcranes• Truckchargingcranes• Crawlercranes• Telescopiccranes

Dockside cranes• Containercranes• Slewingcranes• Shipdischarging

cranes• Floatingcranes

Cable cranes

Off-Shore pedestal cranes• Containerbridges• Stockyardcranes

Grab divices

Spreaders

Crane Installations Conveyors and Transporting Equipment

Overhead conveyors

Stackers

Lifts

Bucket conveyors

Escalators

Fork lifts

Trolley conveyors

Marshalling installations

Shelf handling equipment

Inclined hoists

Transport installations

• ropesheaves

• runnerwheels

• outriggerfloats

• wearliners

• slidingbearings

• ropepulleys

• hose reels

• supportrollers

• gearwheels

• toothedracks


Avarietyofmaterialsareavailablefortheproductionofmachinepartsusedinlifting,handlingandtransportationequipment.AlotoftheseitemsaremadeofLAMIGAMID®310,314,318(WFN),319,320,324/327andourhigh-performancepolyamideLAMIGAMID® 1200.

Materials

Material mechanicalproperties Applications

Density

Yieldpoint/

Tensilestrangth

Percentageelog

ation

atbreak

Mod

uleofelasticity

etsablishedintensil

Ballind

entation

hardness

Notchim

pactstreng

th

g/cm3 N/mm2 % N/mm2 N/mm2 KJ/m2

LAMIGAMID® 310 1,15 75 >25 3250 154 3,5-15Ropesheaves,Rollers,Bearingrollers,Linings,Gears

LAMIGAMID® 314 1,16 70 > 20 3150 145 2,7-12Ropesheaves,Rollers;Wearpads

LAMIGAMID®318 1,15 80 > 20 4000 120 6 Wearelements

LAMIGAMID®319 1,15 80 >25 3150 145 4-15Ropesheavesandwheelswithoutadditionalbearings,Slidingliners

LAMIGAMID®319M3 1,15 95 >25 3300 160 > 4 Wearelements

LAMIGAMID®319M8 1,15 90 >25 3200 155 > 4 Wearelements

LAMIGAMID® 320 1,15 90 >15 3400 165 2,5-12 heavy-dutyrollers

LAMIGAMID®324/327 1,16 95 >15 3400 165 2,5-12heavy-dutywheelsrunningspeedupto3m/sec.

LAMIGAMID® 1200 1,03 60 > 20 2000 100 > 10Gears,Chainwheels,Pulleys,Wheels,SlideandSealrings,Curvediscs,etc.

Table 1: MechanicalpropertiesofsomeLAMIGAMIDmaterials(meanvalues)andtheirapplications.Thetable„SyntheticMaterials,technicaldata“willshowyoufurthermechanical,electricalandthermalproperties.

UsetheQR-Codeorvisitourwebsiteschwartz-plastic.com.


Characteristic properties

LAMIGAMID® 310 - standard quality isaresilient-hardcastpolyamide.Thismaterialfeatures:

• lowspecificweight• high strength hardness and toughness• high resistance to tear and wear• low surface pressure with regard to metallic

partners• good sliding and emergency running

properties• good resistance against sea water, oil and grease• good corrosion and weathering resistance

LAMIGAMID® 314

isaresilient-hardcastpolyamidewithaMoS2-additive.Thisadditiveleadstoanincreaseinthematerial‘sdegreeofcrystallizationwhich,inturn,increasesthesur-facehardness,therebyslightlyimprovingthecoefficientoffrictionincaseofdry-run.

LAMIGAMID® 318 (WFN)

isacastingmaterialwithliquidlubricant.Itevenhasalo-wercoefficientofslidingfrictionandcanbeusedtopro-duceallconceivableforms.Roundandangledshapescanbefabricatedwithoutanyproblem.Ifyouneedtotakeyourwearpadsintothethirddimension,thenLAMIGAMID®318istheperfectmaterialforyou.Tempe-raturerangefrom-40°Cto+60°C.

LAMIGAMID® 319

isaresilient-hardcastpolyamide,oilfilled.Theaddedoilisanintegralcomponentofthematerialandcontributesalottoanessentialreductionofthecoefficientoffrictionincaseofdry-run.Thematerialisself-lubricatingandmaybeusedwith-outadditionallubricants.LAMIGAMID319‘swearresistancecharacteristicsaresuperiortothoseofthestandardquality.Inaddition,thematerialabsorbsconsiderablylesshumidity.

LAMIGAMID® 319 M3 and M8

istheresultofinnovativedevelopmentandmanyyears‘experience.Withthesevariationsweextendourrangeofmaterialsinthefieldofself-lubricatingmaterials.LAMIGAMID319M3andM8areperfectthematerialsforspecificrequirements.

LAMIGAMID®319M3andM8areonlyavailableinahighlevelorder.Togetfurherinformationpleasecontactus.

LAMIGAMID® 320

isasuper-hardcastpolyamide.Thematerialwasespeciallydevelopedforheavilyloadedrunnerwheels.ItsE-modulusissuperiortothatofthestandardquality.Thisalsoappliestoitsballindentationhardness.Thematerialmaybeusedunderconsiderablyhigherlimitloads.

LAMIGAMID® 324/327

correspondstotheLAMIGAMID320quality.InordertoincreasethedegreeofcrystallizationandtheheatdeflectiontemperaturethematerialisenrichedwithMoS2 andaheatstabilizer.Theseadditionsenablethematerialtoberununderhighspeedsandhighloads.Eveninthecaseofhightemperaturestheadmissiblelimitloardsaresuperiortothoseofthenormalqualities.

LAMIGAMID® 1200

LAMIGAMID®1200isourhigh-performancepolyamidquality.Itistheresultofinnovativedevelopmentandmanyyear‘sexperience.Castwithoutpressureforanalmosttension-free,homogeneousmaterialwithexcellentpropertiesforhigh-stressapplications.Usingourowncompositionsandproductionprocesses,weareabletoreachaveryhighmolecularweightandcrystallinity.Thankstothesecharacteristics,SchwartzhasreceivedUSPVIauthorisationforcastpolyamide12-LAMIGAMID® 1200.

NEW


Description of the Process

Caprolactam,therawmaterial,ismeltedintwodifferentvesselstogetherwiththeactivator(2)ontheonehandandthecatalyst(3)ontheother;subsequentlythetwoseparatemeltsaremixed(4)andcastintopreheatedmoulds.

Reaction(polymerization)takesplaceinthesemoulds;thepolyamidecrystallizesandsolidifies.AfteracertainperiodoftimethemouIdcanbeopenedandthecastingcanberemoved.

Centrifugal Moulding

Thisprocedureisusedfortheproductionofmouldingsofcircularsymmetry,suchasropesheaves,runnerwheelsortubes.

InthecentrifugalprocessthepreheatedmouIdrotatesatahighspeedaboutahorizontalorverticalaxis.Thecentrifugalforcepressesthemeltagainstthemould’swalls.Itemsproducedinthisprocessarecharacterizedbyhighstrength.

Gravity Casting

Inthisprocessthemeltisgravity-fedintopre-heatedmoulds.Thegravityprocessisusedfortheproductionofsemifinishedproductssuchasroundrods,plates,plungers,largetubesandothermouldingssuchasoutriggerfloats.

LAMIGAMID®310consistsofthreecomponents:Caprolactam,activatorandcatalyst.Caprolactamistherawmaterial,whereastheactivatorandcatalystareintendedtocontrolpolymerization.Thedosageofthesetwolattercomponentsinfluencesthecoursesofthereaction.Byvaryingthedosageoftheindividualcomponentsthematerialmaybeproducedinresilient,resilient-hardorsuperhardquality.


Tailor-made solutions

AtSchwartzTechnicalPlasticsweloveachallenge.Cometouswithyourspecificationsandrequirementsandletushelpyoufindtheperfectsolution.Ourtech-nicalplasticsareidealforindividualanddemandingapplications.

Ourhighlyqualifiedteamwillworkcloselywithyoutocomeupwiththebesttechnicalandeconomicallyviablesolution.Wespecializeinthedevelopmentandmanu-factureofcustom-madecomponentsforourcustomers.Ourmodernmanufacturingplantsandstate-of-the-artprocessesaretailoredtosuiteachindividualmaterialsandofferspeed,flexibilityandthehighestqualitystan-dards.(CertifiedaccordingtoDINENISO9001,VDehEN29004/ISO9004,typeapprovalsfromDNV,Germa-nischerLloyd,Lloyd’sRegisterandBureauVeritas.)

Ourengineersmakesurethatyourplansareperfectlyimplemented,buttheycandomuchmore.Shouldyourequirehelporconsultationattheplanningstage,ourstaffishappytooffertheirideasandexperience.Greatideasandperfectmaterials–that’swhatdefinesSchwartz Plastics.


Rope Sheaves made of LAMIGAMID® Materials

Theuseofplasticropesheavesinropegearingsismoreand more increasing. LAMIGAMID® rope sheaves areused in all types of cranes, electrical and chain hoists,handlingandtransportationinstallations,liftingplatformsandmanyotherdevices.

Ropesheavesmadeofplasticcanbeusedforanylifting,handlingortransportationequipment,exceptforunitsusedinhigh-temperatureplants.LAMIGAMID® ropesheavesareproducedinthesamesizesasmetallicones.Theycanalsobeusedforropetensionsofthesamekind.Theadmissibleinclinedtensionis3°.

Severalyearsofapplicationinmanyhoists,handlingandtransportationinstallationshaveshownthattheirwearbehaviourisatleastequivalenttothatofmetallicwheels.InagreatnumberofinstallationstheuseofLAMIGAMID®ropesheaveshasresultedinevenmuchbetterperiodsofservicelife.

ReasonsfortheapplicationofLAMiGAMID® rope sheavesare:

• considerably lower weight• extended wire rope life• improved vibration dampening

RopesheavesaremadefromLAMIGAMID®310and319.OurstandardqualityforsheavesisLAMIGAMID® 310. Thisqualityisusedforalmostallsheavesintendedforusewithrollerorslidingbearing.

LAMIGAMID®319isparticularlyusedforsheaveswhichareintendedforlowropetensionsandlowcircumferentialspeeds. These sheaves canbeusedwithout a roller orsliding bearing. They can bemounted directly onto theshaft.Fortechnicalproperties,pleaserefertoTable1onpage4ortable„SyntheticMaterials,technicaldata“.

Underload,LAMIGAMID®ropesheavescanbeusedattemperaturesfrom+60°Cdownto—40°C.


The weight of LAMIGAMID® Rope Sheaves

Wire Rope Life

Owingtothelowspecificweightoftheplasticmateri-al,LAMIGAMID®ropesheavesareconsiderablylighterthanropesheavesmadeofsteeloraluminium.Foryourinformationwehaveindicatedbelowthespecificweightofdifferentropesheavesmaterials:

Steel approx. 7.85 g/cm3

Aluminium approx. 2.70 g/cm3 LAMIGAMID approx. 1.15 g/cm3

Theweightofa710mmsteelropesheaveisapproximately116kg—comparedto32kgofacorrespondingpulleymadeofLAMIGAMID®.If20ropesheavesofa710mmdiametersarerequiredwithinoneboom,theuseofLAMIGAMID®sheaveswillresultinaweightsavingofapprox.1680kg.Theseconsiderablylowerweightsprovidethefollowingadvantagestothedesigneranduser:

• increase in the hoisting capacity• reduction of the booms’ own weight• in mobile cranes: reduction of the loads acting

upon the axles• easier and quicker installation of sheaves

UsingLAMIGAMID®sheavesconsiderablyextendstheropeslifeexpectancy.Thelifetimeisessentiallydeterminedbythelinepull,theropediameterandtheshapeofthegroove.Itisalsoinfluencedbythesumofradialandlateralpressureswhichoccurbetweenropeandgroove.

Asaresultoftheseforces,thephenomenonofsurfacepressurealternationoccursintheropeorcablewires.Theextentoftheoccurrenceofthisphenomenonde-pendsonthematerialofthesheaveandtherelationofthevaluesoftheE-moduleofgroovematerialandropewire:thesmal-lerthisrelationis,thesmallerwillbetheoccurrenceofthisphenomenon.Thereforehardsheavematerialssuchassteel,castironorhardcastaluminiumwillleadtohighsurfacepressurescausingfractureoftheropestrands.

ThesituationisdrasticallyalteredwithropesheavesmadeofLAMIGAMID®.TheE-moduleofourLAMIGA-MIDgradesrangefrom2.500to3.400N/mm2,whichmeansthatthedegreeofsurfacepressurebetweenropegrooveandropeisinsignificant.Withawrapangleof180°thesheaveadaptsmoresnuglytotherope;thisleadstoanincreasednumberofcontactpointsbetweenropeandwheel.

TestsandobservationsmadehaveshownthattheuseofLAMIGAMID®sheavesalmosteliminateswearontheouterropelayers,thenumberofbendingalternationstilltheruptureoftheropecanbedoubledorincreasedevenmore.


Production of LAMIGAMID®-Rope Sheaves

Customized products in large dimensions.

We are able to manufacture Sheaves having a diametre of 3500 mm.

Theropesheavesareeitherspuncastinspecialmoulds(typeA)ormachine-finishedfromcastbarsusingCNCturningmachines(typeB).

Type A

Thesheavesarecastincentrifugalmoulds.Themouldsproduceanalmostready-to-installcentrifugalcasting.Onlythecenterboreandthegroovearemechanicallyfinishedinordertoassureperfectalignmentwiththegroove.Morethan200differentshapesareavailable.Spun-castsheavesareproducedwithouterdiametersof320to1.500mm.

Type B

Sheaveswithouterdiametersof50to320mmaremachine-finishedfromcastbars.MachiningiscarriedoutonCNC-controlledlathes.Thewheels‘lateralsurfacesareusuallyplain,buttheycanalsobedeliveredwithlateralrecesses.Anyoptionalspecificationcanbesupplied.Thistypeofsheaveisavailablewithouterdiametersupto3.500mm.

Boththespun-castsheavesaswellasthemachine-finishedonesaregenerallysubjectedtoathermalconditioningprocess.Thesheavesarebothtemperedandconditioned,whereasthemachine-finishedareonlytempered.Thisistoinsurethatallthematerialusedisstress-free.


Finding the perfect solution

Ourengineersmakesurethatyourplansareperfectlyimplemented,buttheycandomuchmore.Shouldyourequirehelporconsultationattheplanningstage,ourstaffishappytooffertheirideasandexperience.Greatideasandperfectmaterials–that’swhatdefinesSchwartzPlastics.

Bothwithregardtotheoutsideandgroovebasediameteraswellastothesheaveandborewidth,thedimensionsofLAMIGAMID®sheavesareidenticaltothoseofcorrespondingmetalsheaves.Thedesignofthewebsofspun-castsheavesisadaptedtothematerialinvolved.ThetolerancesapplicabletoLAMIGAMID®sheavesareappropriateforplastic materials.

a) Tolerances for Spun-Cast Sheaves

ØOutsidemmfrom300-500

ØOutsidemmfrom500-800

ØOutsidemmexceeding800

D2ØOutside ±2,0 ±3,0 ±5,0

D1Øgroovebase ±2,0 ±3,0 ±5,0

D3Øborediameter ±2,0 ±3,0 ±3,5

Mismatch ±1,0 ±1,5 ±2,0

Width B1+B2

upto60mm from61-100mm exceeding100mm

B1sheavewidth -1,5 -2,0 -2,5

B2borewidth ±0,1 ±0,1 ±0,1

Design of LAMIGAMID® Sheaves

Table 2


b)GrooveProfilesandGrooveRadii

Table 3

Design of LAMIGAMID® Sheaves

Nominaldiameterofrope/cable

d1

h i m Grooveradius Nominaldiameterofrope/cable

d1

h i m Grooveradius

Guidevalues Guidevalues

r1 r1

3 8 9 2 1,6

+0,4

25 40 51 8 13,5

+0,84 10 11 2 2,2 26 40 52 8 14

5 12,5 14 2 2,7 27,28 40 53 8 15

6 12,5 15 3 3,2 29,30 45 59 8 16

7 15 17 4 3,7 31,32 45 60 8 17

+1,6

8 15 18 4 4,2 33,34 50 65 10 18

9 17,5 21 4,5 4,8 35,36 55 71 10 19

10 17,5 22 4,5 5,3

+0,6

37,38 55 72 11 20

11 20 25 5 6 39,40 60 78 11 21

12 20 25 5 6,5 41 60 79 11 22

13 22,5 28 5 7 42,43 65 84 11 23

14 25 31 6 7,5 44,45 65 86 12,5 24

15 25 31 6 8 46 67,5 89 12,5 25

16 27,5 34 6 8,5

+0,8

47 70 91 12,5 25

17 30 37 6 9 48 70 93 12,5 26

18 30 38 6 9,5 49 72,5 95 12,5 26

19 32,5 40 7 10 50 72,5 96 12,5 27

20 35 43 7 10,5 52 75 99 12,5 28

21 35 44 7 11 54 77,5 103 12,5 29

22 35 45 7 12 56 80 106 12,5 30

23 35 46 7 12,5 58 82,5 110 12,5 31

24 37,5 48 8 13 60 85 113 12,5 32


LAMIGAMID®sheavesaresuitableforusewithrollerbearingsoranti-frictionbearingsmadeofplasticmaterialorbronze.LAMIGAMID®319sheavescanrundirectlyonsteel shafts.

Table 4: BearingtypesforLAMIGAMID®sheaves

a)RollerBearings

Mostofthesheavesareusedtogetherwithrollerbearings.Inmostcasesthesebearingsaredirectlypressedintotheboreholes.Aneventualexcessivesqueezebetweenthebearingandtheboreisrelievedbymeansofapressed-inintermediatesteelbushinginwhichthebearingsarethenmounted.

Therollerbearingispress-fitintotheboreoftheLAMIGAMID®sheavebywayofcoldpressing.Forreasonsofconveniencethisoperationiscarriedoutusingapress.Dependingonthetypeoftherollerbearingtherearecertainminustoleranceswhichareobservedforboreholes.Theminustolerancereferstotherespectiveoutsidediameteroftherollerbearing.

b) Journal Bearing Bushes

LAMIGAMID®310sheavesmayalsobeequippedwithplasticormetalslidingbearings.Inthiscasetheadmissibleloadforthesheavedependsonthebearingcapacityoftherespectiveslidingbearing.

SuchplasticbearingbushingsaremadefromLAMIGAMID®319or510.Boththesematerialsareself-lubricatingtoalargeextent.Theaveragebearingpressureiscalculatedaccordingto:

Equation 5:

P = F

N/mm2

b·d

F = AxleloadinN

d = Hubwidthinmm

b = Diameteroftheboreinmm

Forboththesematerialsonecanassumeamax.admissiblePVvalueofapprox.0.05N/mm2·m/s.If possible the average bearing pressure shoudbe lessthan25N/mm2.

Metalslidingbearingsareinsertedinthesheavesbywayofcastingorpressingthemin.Iftheyarepress-fititisrecommended to secure themmechanically. The staticfrictionbetweenthemetalandtheplasticisnotsufficientsothatthebearingsmightpossiblycreepoutofthecenterboreinanaxialdirection. Ifthesheavesaretobeequippedwiththin-walledslidingbearings, intermediatesteelbushingsareinsertedinthewheelbywayofcastinginorpressfitting.

c)OperationwithoutRollingorJournlBearingBush

SheavesmadeofLAMIGAMID®319arealwaysusedwithoutadditionalbearings.LAMIGAMID®319ischaracterizedbyalowfrictioncoefficientindry-run,andlowmoistureabsorption. PriortousingLAMIGAMID®sheavesthemainbearingpressurehastobecalculated.ThiscanbedoneusingEquation5.

Example:

RopeSheave Ropetension=500N

Centerbore V=1,0m/s

Hubwidth Wrapangle180°

P =2·500

=1000

30 · 30 900 P=1,11N/mm2

Table12onpage31showswhetherthesheavecanbeusedatthedeterminedbearingpressureandthecirum-ferentialvelocityof1.0m/s.

Fornon-stopoperationthebearingpressureistoohigh.Atacircumferentialspeedof1.0m/sitsmaximumwouldbe0,5N/mm2.However, if thesheave isonlysubjecttoshort-termloads,theuseofLAMIGAMID®319couldpossiblybetakenintoconsideration.Inthiscasethebe-aringpressuremayexceedthevaluesshownintable12byafactorof2,5.

Bearings for LAMIGAMID® Sheaves

LAMIGAMID®-quality

with roller bearing

withanti-friction

bearingsmadeof self-

lubricatingplastic

withcast-inbushingmadeof

steel/bronze

withoutaddi-tionalbearing

310 yes yes yes no

319 no no no yes


Multi-Wire-Sheave

Aninnovativesolutionforsheaveswithdifferentcablediameters

Offshorecranesthatworkindifferentdepthsneedtobeequippedwithcablesandsheavesofvaryinggroovediameters.Whereasthickerandlighterpolymercablesareusedincranesworkinginareasofextremedepth,applicationsatsurfacelevelorinloftyheightsrequireheavieryetthinnersteelcables.Inmanycasesasinglecranesystemisusedtoworkbothareas,inwhichcaseitbecomesnecessarytoequipthesheavewithdifferentsheavegroovediameters,sincechangingtherollduringoperationishardlypossible.

Themulti-wiresheaveissuitableforwirecableswithadiameterof76mmto130mmandagrooveprofileof45°to40°.Thissafeandsimplesolutionsavesbothmo-neyandtime,sincetheneedtodisassembleorremovesheavesbeforechangingcablesnolongerarises.Cablegroovesegmentscanberemovedseparatelyasneeded.

TheremovableplasticpartsaremanufacturedfromLAMIGAMID® 310.

WorkingcloselywithourpartnercompanyVanMechelenLiftingGear,wehavedevelopedanewpulleysystemthatincorporatesaLAMIGAMID® cap with groovesthatcanbeadjustedtofitdifferentcablediameters.ThisinnovativedevelopmentbringstogetherthebestqualitiesofmetalandLAMIGAMID®,offeringstrengthandstabilityontheonehand,whileatthesametimebeinglowinweightandrealeasyonthecables.

Bild:VanM

echelenLiftingGear

TheadvantagesofLAMIGAMID®310ataglance:

• lowspecificweight• high strength hardness and toughness• high resistance to tear and wear• low surface pressure with regard to metallic

partners• good sliding and emergency running

properties• good resistance against sea water, oil and

grease• good corrosion and weathering resistance.


Areas of appliaction for Sheaves

made of LAMIGAMID


Areas of application for heavy runner wheels made of LAMIGAMID®


Runner wheels made of LAMIGAMID®

ForquiteanumberofyearsLAMIGAMID®runnerwheelhavenowbeensuccessfullyusedforheavy-dutyserviceinlifting,handling,transportationandconveyinginstallations.

RunnerwheelsmadeofLAMIGAMID®materialsshouldbeusedifthefollowingdemandsaretobefulfilled:

• extremely silent run• reduced rail wear• resistance against corrosion• physiological harmlessness

LAMIGAMID®runnerwheelscanbeusedinanyknowntypeoflifting,handling,transportationandconveyinginstallationaslongastheadmissiblelimitloadsarenotexceeded.

Theuseofplasticrunnerwheelsisnot,oronlyconditionally,possibleif:

• the rolling speed exceeds 5 m/s (In this case the heating-up of the tread would become too great.)

IfacylindricalLAMIGAMID®runnerwheelcomesincontactwithasteelrail,theflatteningofthiswheelisapproximatelyseventimesasmuchasinthecaseofasteelwheel;asaresulttheloadactingonthesyntheticwheelisonlyoneseventhoftheloadwhichwouldactonacomparablesteelwheel.ThisexplainsthegreatercarryingcapacityofLAMIGAMID®runnerwheels.

Inthecaseofacrowned,i.e.spherical,wheeltreadthesituationisevenmorefavourable.Aball-shapedtreadcorrespondstotheidealcaseofaballbeingincontactwithaplanesurface.Althoughthecorrespondingflatteningisonlyfourtimesasgreatasinthecaseofacylindricalwheel,theloadactingonthewheelisnever-thelessonlyonethirteenthofthecorrespondingvalueofasteel/steelcombination.

LAMIGAMID®runnerwheelsarehighlyresistanttowearaslongastheadmissiblelimitloadsareobserved.Thewearrateofdrivenwheelsisslightlyhigherthanthatofidlingones.Theratewillbeincreasedbysharpbrakingmanoeuvresorexcessiveacceleration.

Ifpossible,plasticrunnerwheelsshouldbeusedwithoutwheelflange.Thewearrateofflangedrunnerwheelscanbeveryhighifthewheelsrunoncurvedpathsorifthewheelflangesaresubjecttogreatguidingforces.LAMIGAMID®runnerwheelsreducetheshocksactingontherollerbearingandthereforecontributetoanessentialextensionofthebearings’servicelife.


Runnerwheelsforheavy-dutyservicecanbemadefromLAMIGAMID®grades310,319,320,324/327and1200.ForthemechanicalpropertiesofthedifferentmaterialspleaserefertoTable1onpage4ortoourchart“SyntheticMaterial,technicaldata”.

AllLAMIGAMID®materialsarehighlyfatigueresistantandcharacterizedbyexcellentelasticcapacity.TheirE-moduliareconsiderablylowerthanthoseofsteel,caststeel,castironornodularcastiron.TheselowE-moduliareadvan-tageousforhighlystressedrunnerwheels.Theplasticmaterialsdeform,therebycreatinglargersupportsurfaceswhich,inturn,resultinsmallermaximumsurfacepressurevalues.Theelasticpropertyissufficienttorestorethewheeltoitsoriginalformaftertheloadisreleased.Ifarunnerwheelhasbeensubjectedtothemaximimadmissibleloadsoveralongperiodoftime,thecontactpointsmayshowvisibleflattening.However,theseflatteningswillbestretchedafterafewrollmotions.

LAMIGAMID® 310

ThestandardgradeforrunnerwheelsisLAMIGAMID®310,aresilient-hardcastpolyamide.Mostoftherunnerwheelsmadefromthismaterialareusedinconnectionwithrollerorslidingbearings.

LAMIGAMID®310isusedtoproducerunnerwheelse.g.forlifts,constructionsitecranes,materialhoists,verticalconveyorsandmaterialhandlingequipment,slidingdoors,etc.

LAMIGAMID® 319

isaresilient-hardcastpolyamide,oilfilled.Owingtothematerial’slowfrictioncoefficientindryrunanditsminimalhumidityabsorption,LAMIGAMID®319runnerwheelscanbeusedwithoutrollingorslidingbearing.Theyarealsosuitableforoutdoororunderwaterservice.

Runnerwheelsmadeofthismaterialareusede.g.inIifts,stageequipment,overheadconveyorsandmar-shallinginstallations.

LAMIGAMID® 320

isacastpolyamideofaparticularlyhardcomposition.Thismaterialhasbeendesignedforrunnerwheelsusedforserviceunderhighstress.Bothstaticallyaswellasdynamically,LAMIGAMID®320canbesubjectedtohigherloadsthanthestandardgrade.Evenunderstaticloadnovisibleflatteningwilloccuraslongasthelimitloadsarenotexceeded.

LAMIGAMID®320isusedforrunnerwheelsinelectricalandchainhoists,lifttrucks,portalcranes,bridgecranes,shelfhandlinginstallations,etc.

LAMIGAMID® 324/327

isalsoaparticularlyhardcastpolyamide.InordertoincreaseitsdegreeofcrystallizationthematerialismodifiedbymeansofMoS2andaheatstabilier.

Owingtotheseadditions,runnerwheelsmadeofLAMIGAMID®324/327canbesubjectedtoevenhigherloads.Inaddition,theycanbeusedathighervelocities.LAMIGAMID®324/327isusedtoproducerunnerwheelsforelectricalandchainhoists,portalcranes,bridgecranes,shelfhandlinginstallationsetc.

LAMIGAMID® 1200

isourhigh-performancepolyamidquality.Itistheresultofinnovativedevelopmentandmanyyear‘sexperience.Castwithoutpressureforanalmosttension-free,homogeneousmaterialwithexcellentpropertiesforhigh-stressapplications.Usingourowncompositionsandproductionprocesses,weareabletoreachaveryhighmolecularweightandcrystallinity.Thankstothesecharacteristics,SchwartzhasreceivedUSPVIauthorisa-tionforcastpolyamide12-LAMIGAMID® 1200.

LAMIGAMID® Grades Used for Runner Wheels


InmostcasesLAMIGAMID®runnerwheelsaremadefromroundbarstockorfrompipes.Runnerwheelswithoutsidediametersof40-300mmaremachinedonCNC-controlledlathes.

LAMIGAMID® runnerwheelscanbesuppliedinanydesiredsizeandshape.Allthecastorspun-castma-terialsusedaresubjectedtothermalconditioningandcharacterizedbyexcellentplasticproperties.

TheuseofLAMIGAMID®runnerwheelsdependson:

• the wheel load• the travelling speed• the ambient temperature

Beforeusingrunnerwheelsmadeofplasticitisneces-sarytocalculatethedeformationofthetreadandtheactinginthebore.

Exhibit 3: Loaddiagram

Exhibit 2: DifferentdesignsofrunnerwheelsmadeofLAMIGAMID® materials

Design Information

Ourengineersmakesurethatyourplansareperfectlyimplemented,buttheycandomuchmore.Shouldyourequirehelporconsultationattheplanningstage,ourstaffishappytooffertheirideasandexperience.Greatideasandperfectmaterials–that’swhatdefinesSchwartzPlastics.

Bearings for LAMIGAMID® Runner Wheels


LAMIGAMID®runnerwheelscanbemanufacturedwithanydesiredkindofcenterbore.Exhibit4showssomeofthepossiblecenterboretypes:

Abbildung 4

1. Smooth Bore

Runnerwheelsaremadewithasmoothboreifthey

• run directly on an axle• are shrunk on steel shafts• areusedwithapressfitmetalbushing

Asarule,runnerwheelswhichrundirectlyonashaftareproducedfromLAMIGAMID319.ForrunnerwheelsmadeofLAMIGAMID®319onecanassumeamax.admissiblePvvalueofapprox.0.5N/mm2 · ms. Ifpossiblethemainbearingpressureshouldbelessthan25N/mm2.

LAMIGAMID®runnerwheelscanalsobeshrunkonsteelshafts.Therunnerwheelsareeitherheatedupto60°Candthenshrunkon,orpressedoncold.

Bothwaysensureatightfit.Inthesecasesthemainbearingpressuremaybeapprox.65N/mm2,theshort-termloadmayevenbeashighas90N/mm2.

Theloadsactingintheboreshavetobecalculatedinanycase.Thiscanbedoneusingthefollowingequation:

Pmax=F =[N/mm2] b·d


ItisalsopossibletopressmetalbushingsintoLAMIGAMID®runnerwheels.Coldpressingisrecommended.Thepressurebetweenthebushingandthehubshouldnotexceed65N/mm2.

2.CenterboresforRollerBearings

TheborecanbesuppliedwithgroovesforSeegercircliprings(Exhibit4,item4)orwithtwobearingseats(item3).Therollerbearingsarefittedwith0.5%minustoleranceandinmostcasesadditionallyfixedbymeansoflockingringswhichsecurethewheelinaxialdirection.Insertionisaccomplishedbymeansofcoldpressing.Maximumpermanentpressurebetweenplastichubandbearingmaybe65N/m-m/2,maximumshort-termpressureis90N/mm/2.

1)Smoothpassagebore

2)withpressed-inbearingbush, e.g.madeofLAMIGAMID®510

3)withtwoballbearingseats

4)withballbearingseatandtwo groovesforSeegercircliprings

5)withfeatherkeygroove

6)withmultiplesplinetoothing accordingtoDIN5480


3. Centerbores with Feather Key Grooves

LAMIGAMID®runnerwheelscanalsobeusedwithfeatherkeygrooveinthebore.Inthecaseof loadtransmissionbyfeatherkeytheadmissiblesurfacepressureactingonthekeywayflankshastobecalculatedineveryindividualcase.

Thevaluesshowninthetablemustnotbeexceeded.

LAMIGAMID® 310

LAMIGAMID®

320LAMIGAMID®

324/327

N/mm2 22 25 25

Table 5:Max.admissiblesurfacepressureatkeywayflanksforLAMIGAMID® materials.

Iftheloadatthekeywayflanksistoogreatonehastouseasteelhub.Inthecaseofrunnerwheelswithatape-redweb the hub diameter should at least be 1.6 times theshaftdiameter.Thecorrespondingequationis:dn>1.6d.

ThelengthofthehubsouldbesufficienttoensurethatthesurfacepressureatthekeywayflankswillnotexceedthevaluesshowninTable5.

4. Centerbores with Multiple Spline Toothing

LAMIGAMID®runnerwheelscanalsobesuppliedwithamultiplesplinetoothingaccordingtoDIN5482inthebore.Thistypeoflinkageoffersseveraladvantages:

• friction-type connection• transmission of great torque values• convenient installation• convenient removal, the plastic wheels will not

become shrunk on the steel shafts even after years


Theequationforthecalculationoftheminimumkeywaysurfaceis:

min.surfaceofkeyway=

9860+103·p(kW) [mm2]

r+r+p

r=radiuskeywaycentreinmmp=admissiblesurfacepressure(table5)


RunnerwheelsmadeofLAMIGAMID310,319,320or324/327areproducedbyspunmoulding.Theyareavailableinanydesign.

LAMIGAMIDrunnerwheelsareusedwiththesamedimensionsanddesignsasmetalwheels.

Wheelsize Ø a b Ø c Ød e Typeofbushing

LoadcapacityinN

Ø125x40 125 40 51,8 45 15 6304 26000

Ø150x50 150 50 51,8 45 15 6304 26000

Ø200x50 200 50 61,8 55 17 6305 35000

Ø250x65 250 65 61,8 55 17 6305 35000

Ø300x75 300 75 71,8 65 19 6306 45000

availablein:• LAMIGAMID® 310

• LAMIGAMID® 319

• LAMIGAMID® 320

• LAMIGAMID® 324/327

• LAMIGAMID® 1200

a) Standard Design:

Design of LAMIGAMID Runner Wheels

Table 6

Pressed-in Plastic Bushes

LAMIGAMID®runnerwheelscanalsoberealizedwithpress-fitbushesmadeofself-lubricatingplastics.SuchbushesaremadefromLAMIGAMID®319,510or600.Theselectionoftherespectivebushingmaterialdependsontheenvironmentalconditions.TheguidevalueforallthesematerialsisanadmissiblePVvalueofapprox.0.05N/mm2m/s.

LAMIGAMID®319isusedasbushingmaterialforminorloadsandmotions.ForeconomicreasonspressfitofLAMIGAMID®319busingsiscarriedoutonIyinthecaseoflargerunnerwheels.Runnerwheelswithoutsidediametersupto300mmareproducedinplainLAMIGAMID®319.

LAMIGAMID®510absorbsverylittlemoisture.Thismaterialdoesnotswell.Itcanthereforebeusedforunderwaterservice.However,itsnotchedimpactstrengthissubjecttocertainlimitations.Hardshocksandimpactsmayleadtothedestructionofthebushings.Inaddition,thismaterialisnotsuitableforapplicationswithhighedgepressures.LAMIGAMID®510ischaracterizedbyexcellentresistanceagainstabrasionandwear.

LAMIGAMID®600alsoabsorbsverylittlemoisture.However,thismaterialismoresensitivetoabrasionandwearthanLAMIGAMID®510,butfeaturesabetterimpactstrength.


b) Single-Flange Wheels

Design of LAMIGAMID Runner Wheels

NorminalØd1

b d2 d3max.

d4 I I1 L2 Toothedring Min.railwidth Max.wheelloadNm Z

200 50 230 100 225 95 35 703 75

40 350004 56

250 60 270 120 264 120 40 803 88

48 550004 66

300 65 335 150 330 120 45 903 110

52 660004 82

315 75 350 150 340 140 50 100 4 85 60 82000

400 75 430 180 424 140 50 100 4 106 60 100000

500 85 540 200 528 170 55 110 6 88 70 140000

630 95 680 250 664 200 60 120 8 83 82 180000

c) Double-Flange Wheels

Table 7

Dimensions

D=60-300mm• madefromroundbarstock• machinedonCNC-controlled

lathes

D=300-1000mm• spun-castinmoulds• minorquantitiesmadefrom

roundbarstock

availablein:

• LAMIGAMID® 310

• LAMIGAMID® 319

• LAMIGAMID® 320

• LAMIGAMID® 324/327

• LAMIGAMID® 1200 Examplesofuse:

• Electrical and chain hoists

• Warehouse installations

Dimensions:

• Otherdimensionsanddesignsarealsoavailable

availablein:• LAMIGAMID® 310• LAMIGAMID®319• LAMIGAMID® 320• LAMIGAMID®324/327• LAMIGAMID® 1200

Examplesofuse• cranes• hoists• storage-andretrieval-units• slidingdoors milledteeth


LAMIGAMID®runnerwheelsandpulleysarehighlyresistanttowearandtear.Theachievedservicelifeperiodscorrespondtothoseofsteelwheels.Howevertherearedifferencesinthewearratesforidlerordrivenwheels.Hardbrakingorrapidacceleration,e.g.throughsharpreversalindirection,cancauseslippageofthewheelsonthetrack.Thismayresultinhighwearrates.

Theflangesofrunnerwheelsaresubjecttoexcessivewearifthewheelsareusedoncurvedpathsandsubjectedtohighguidingforces.Itisthereforerecom-mendedtouseLAMIGAMID®runnerwheelswithoutflanges.

ThewearrateofLAMIGAMID®wheelsrunningonconcreteisalsoverylow.

Wear of LAMIGAMID® Runner Wheels


Asaresultofthedegreeofflatteningoccurringatthecontactpoints,whichisgreaterthaninthecaseofsteelwheels,LAMIGAMID®runnerwheelsarecharacterizedbyaslightlygreaterrollingresistance.

AtnormalroomtemperaturestherollingresistanceµRisapproximately3.5x10-3.Athighertemperatures,thisvaluerisesup8x10-3.

HoweverfieldoperationgatheredwiththeuseofrunnerwheelsandpulleysmadeofLAMIGAMID®hasshownthattherequireddrivepowerdoesnothavetobeincreased.

The force required formotion is opposed to the rollingresistance.Theequationforthecalculationoftherollingresistanceis:

Therollingresistancecoefficientp,ofthevariousLAMIGAMID®runnerwheelsandsheavesisshowninExhibit5asafunctionofthetemperature.

Inthecaseofpermanentserviceofhighlyloadedand/orfasttravellingwheelsandsheaves,therollingresistancecoefficientvalidfortemperaturesfrom60°Cto80°Cshouldalsobeappliedfornormalroomtemperatures,sincetheflexionactinginthewheelwillincreasethetemperature.

Whencalculatingtherollingresistancethefrictionresistanceoccurringattheseatofthewheelhastobeconsidered,too.

Thevaluesshowninexhibit5areonlyguidevalues.Ithasnotbeenpossibletoincludeimportantfactors,e.g.wheeldiameter,wheelload,speedandsurfaceoftherailtrack.

Exhibit 5:Coefficientofrollingresistanceasafunctionoftemperature:

a = LAMIGAMID®310u.319

b = LAMIGAMID®320,324/327und1200

WheeltemperatureinC°

Example:

RunnerwheelofacraneWheeldiameter D=250mmWheelwidth b=50mmWheelpressure F=40000NEnvironmentaltemperature=50C°Material LAMIGAMID320

AccordingtoExhibit5=µ=3,8·103

Calculation:WR=µ·F=3,8·10

3·40.000=152N

Rollingresistanceis152N.

Wr =µ·F(N)

Resistance due to Rolling Friction


Evengreatshockorimpactstresseswillnotleadtoabreakageoftheplasticfloats.LAMIGAMID®outriggerfloatsareusedforsupportpressuresfrom250-1500kN.

Theiradvantages:

• high load capacity• weight reduction compared to steel constructions• break, shock and impact resistant• favourable price

Telescopiccranes,vehiclescarryingconcretepumps,buildingequipmentandmilitaryvehiclesaremoreandmoreoftenequippedwithoutriggerfloatsmadeofengineeringplastics.TheseoutriggerfloatsareproducedfromaLAMIGAMID®gradeofaparticularlyimpactresistantcompositionofhighloadcapacity.

Outrigger Floats made of LAMIGAMID®

NEW

LAMIGAMID®-Qualities for outrigger plates

LAMIGAMID® 300

LAMIGAMID®300isasocalledblockpolymer.Addinglaurinlactam(monomerforcastpolyamide-12)tomeltedcaprolactamresultsinapolyamidewithahigherimpactresistance,especiallyatlowtemperatures,thanLAMIGAMID®310.ThismaterialisthereforeideallysuitedforuseinapplicationswithsuddenstressorshocksituationsanditisalsomoresuitablethanLAMIGAMID® 310foruseattemperaturesbelow0°C.

LAMIGAMID® 400

isasemi-crystalline,amorphic,elastomer-modifiedthermoplasticmaterial.It‘scrystallinityoffershighsta-bility,rigidity,hardnessandabrasionresistancewhiletheamorphicareasandelastomercomponentsprovidehighflexibility,elasticityandmalleability.ThematerialisUV-resistant.

Byvaryingtheelastomercontentthematerialcanbegivenspecificproperties,rangingfromviscous-hardtohighly-elastic.LAMIGAMID® 400isavailableas

LAMIGAMID® 400 B: viscous - hardLAMIGAMID® 400 D: highly viscous, highly elastic

LAMIGAMID®400istheidealengineeringplastic.Becauseitispossibletomodifythematerialspecifically,itcanbeusedfornumerousapplications.


Outriggerfloatswithoutsidediametersbelow400mmareproducedfromsemifinishedblanks.From400mmupwardstheyarecastinspecialmoulds.Table8showsthestandarddimensions.

Inthecaseoftheseoutriggerfloatsonlythesmallerupperdiameterandthesphericalradiusaresubjectedtomachining.Inadditiontheboresforfasteningtheholdingdevicesaredrilled.

Theboresarethenequippedwithpress-fitsteelinsertnuts.Smalloutriggerfloatsareproducedfromroundbarstockorblanks.Overallmachiningofthesepartsiscar-riedoutonCNC-controlledlathes.

OtherdimensionsanddesignsuptoØ900mmareavailableuponrequest.

Design

LAMIGAMID®outriggerfloatsaredesignedeitherinroundorsquareshape.

Thetopoftheoutriggerfloatisequippedwithscrewedonsteelholdingdevices.Theseholdingdevicesaredesignedaccordingtothesiterequirementsorthecustomer’sspecifications.Uponrequestwesupplytheseoutrigger floats completely assembled and ready to beinstalled.

Calculation

ForLAMIGAMID®outriggerfloats,onlythesurfacepressureactingbetweentheballatthehydrauliccylinderandtheoutriggerfloathastobecalculated.

UnderpermanentloadthesurfacepressurePmaxmaybeapprox.55N/mm2.Thisvaluemaybeexceededforshort-termloads.

Theequationis:

P max =

F

[N/mm2]S2 · ∏

4 F=SupportpressureinN S=Contact-Diameterinmm

Production of LAMIGAMID® Outrigger plates

Design Information

Diameter/mm SupportpressureinkN

Ø 400 600

450 730

Ø500 700

542 970

600 1700

Ø700 970

Table 8: LAMIGAMID®outriggerfloats,standarddesigns


Whenworkingwithmobilecranes,accesslifts,telehand-lersandmanyotheritemsofconstructionmachinery,itisparticularlyimportanttokeepthefrictionresistancesencounteredduringtelescopingaslowaspossible.Tostopfrictionfromblockingyou,Schwartzprovidespre-miumhigh-techplasticswithoutstandingslidingpropertiesandhighloadratings.Theperfectoutfitfordailyheavy-dutyoperations.

Benefits:

• jerkyless starts• excellent friction- and wear-resistance• high strength• good running • lowest moisture absorption• long maintenance intervals

ThespecialLAMIGAMID®materialsfromSchwartz(seereverse)displaytheirtalentsassoonasthemovementstarts.Thetransitionfromstandstilltoslidingphaseisbarelyperceptible.Thefamiliar“jerk”typicallyfeltwhenatelescopicmovementisinitiateddisappearsalmostcompletely.Thoseofyourcustomerswhohavetocontrolmovementssmoothlyandwithmillimetreprecisionwillespeciallyappreciatethisbenefit.

Wear pads made of LAMIGAMID® NEW

ThespecialLAMIGAMID®materialsfromSchwartz(seereverse)displaytheirtalentsassoonasthemovementstarts.Thetransitionfromstandstilltoslidingphaseisbarelyperceptible.Thefamiliar“jerk”typicallyfeltwhenatelescopicmovementisinitiateddisappearsalmostcompletely.Thoseofyourcustomerswhohavetocontrolmovementssmoothlyandwithmillimetreprecisionwillespeciallyappreciatethisbenefit.

Whileflatwearpadscaneasilybecutoutofablockofmaterial,roundandangularshapesdemandconsiderablymoreexpertiseandengineering.Wecanproducewearpadsinallshapes,exactlyasyouneedthem,nothingisimpossible.Webringyourfrictionperfectlyroundcornersandthroughbends.


Whileflatwearpadscaneasilybecutoutofablockofmaterial,roundandangularshapesdemandconsiderablymoreexpertiseandengineering.Wecanproducewearpadsinallshapes,exactlyasyouneedthem,nothingisimpossible.Webringyourfrictionperfectlyroundcornersandthroughbends.

Finding perfect solutions

WearlinersandspacersmadeofLAMIGAMID®

materialsareavailableinanydesign(cp.Exhibit6).Theyaremanufacturedfromsheetmaterial.

Exhibit 6:Differentdesignsofwearlinersandspacers

Thesheets‘dimensionsare2000x1000mmor2000x500mmrespectively.Theirthicknessrangesfrom10to100mm.LargerLAMIGAMID®319slidingelementsarecastinmoulds.Machiningiscarriedoutonmodernmachiningequipment.

Production of LAMIGAMID® Wear Pads


WearlinersandspacerscanbeproducedfromLAMIGAMID®318,319,LAMIGAMID®510orLAMIGAMID®700.

Theselectionofthematerialdependson:

• the surface pressure• the sliding velocity• the environmental conditions

Thematerialsmentionedarecharacterizedbydifferentmechanicalandthermalproperties.ApartFromthat,theirindividualmoistureabsorptionratesdiffer.Werefertoourtable„SyntheticMaterials,technicaldata”.

LAMIGAMID®319M3andM8areonlyavailableinahighlevelorder.Togetfurherinformationpleasecontactus.

LAMIGAMID®materialsarecharacterizedbydifferentloadcapacities.

Materials adm.surfacepressureinN/mm2

permanent short-term

LAMIGAMID®318 55 85


LAMIGAMID®319M3 62 90

LAMIGAMID®319M8 60 90


LAMIGAMID700 12 16

Table 9: Guidevaluesfortheadmissiblestaticsurfacepressuresatnormalroomtemperature

Materials Dynamicfrictioncoefficient

indryrun withoillubrication

LAMIGAMID®318 0,12-0,18 0,04-0,08

LAMIGAMID®319 0,14-0,20 0,04-0,08

LAMIGAMID®319M3 0,12-0,18 0,03-0,08

LAMIGAMID®319M8 0,10-0,16 0.03-0,08

LAMIGAMID®510 0,24-0,28 0,02-0,08

LAMIGAMID®700 -0,29 0,02-0,08

Table 10:Dynamicfrictioncoefficientwithregardtohar-denedsteel2162.Peak-to-vallyheight=2µm,surfacepressure=0,05N/mm2,V=0,6m/s.

Materials NEW

Materials Moistureabsorption

Standardatmosphere

23/50Storageinwater

LAMIGAMID®318 1,0% 4,0%

LAMIGAMID®319 1,0% 4,0%

LAMIGAMID®319M3 1,0% 4,0%

LAMIGAMID®319M8 1,0% 4,0%

LAMIGAMID®510 0,4% 0,6%

LAMIGAMID®700 0 % 0,1%

Table 11

Absorption of Moisture

Coefficient of Dynamic FrictionAdmissible Surface Pressures


Design Information

Table 12:Max.admissibleloadsasafunctionofsurfacepressureandslidingspeed.Thevaluesshowninthediagramareonlyvalidforcontinuousmovements.Theindicatedadmissiblestaticlimitloadscanbeappliedfordiscontinuousmovements.

Slidingelementsusedintelescopicboomsdonothavetobelubricated.Anapplicationofgreasepriortoinstallationissufficient.Ifpossiblethecountersurfaceshouldbemadeofstainlessmaterial.However,thisisnotunderstoodasanabsoluteprerequisite.Thecountersurfaceshouldconsitofamaterialhavingapeak-to-valueheightofRt5to8.

Design of Shape

Wearlinersandspacersareavailableinanydesign.Theslidingsegmentsaresubjectedtooverallmachining,i.e.theyaredeliveredreadytobeinstalled.

Calculation

Inmostcasestheuseofwearlinersandspacersdoesnotrequireanycalculation.Normallytheoccuringsur-facepressuresandslidingvelocitiesarefarlowerthantheadmissiblevalues.

Staticloadingcanbecalculatedaccordingtotheknownformulae.Fortheadmissibledynamicalloads,pleaserefertothefollowingdiagramm.

Miscellaneous

Headquarter

Schwartz GmbH Hagdornstraße 3D-46509 Xanten

Phone: 02801 76-0Fax : 02801 76 55E-Mail: [email protected]

SalesOfficeUSA

Schwartz Technical Plastics, Inc.2301 Duss Avenue, Suite 24, Ambridge, PA 15003, USA

Phone: +1 724-266-7045Fax : +1 412-202-9999E.Mail: [email protected]

CzechRepublic

Schwartz Technické Plasty CR s.r.o.Petrovická 22, 59231 Nové Mesto na Moravé, Tschechische Republik

Phone: +420 566 618 205Fax: +420 566 618 206E-Mail: [email protected]

China

Schwartz Technical Plastics Co., Ltd.Room 805, Wisdom Garden, No. 380, Xinsong Road, Minhang, District, Shanghai201100, P.R. China

Phone: +86 21 5887 2225Fax: +86 21 5887 2280E-Mail: [email protected]

www.schwartz-plastic.com

Committed to qualityAudited and certified by

DINENISO9001Z.R.-Nr.711007051

VDEhEN29004/ISO9004Z.R.-Nr.W73

Theinformationcontainedinthisleafletisbasedonthecurrentstateofourknowledgeandisintendedsolelytoprovidefurtherdetailsonourproductsandtheirpossibleapplications.Itisnotintendedtoensurethemeaningorspecificfeaturesorpropertiesoftheproductorit‘ssuitabilityforaspecificpurposeorapplication.Anypatentedrightsaretobeobserved.

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