Slide bearings - Wolf Kunststoff-Gleitlager GmbH

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CCCCCC6. Counter-rotating material(screw, axis)6.1.MaterialThe following materials can be used as counter-rotatingmaterial (relative material cost).Please prefer those materials among the group, whichare printed in red.Counter-rotating material (screw)6.1.1.8. Alloyed cold-worked steels accordingto DIN-standard 17350 cured and tempered:X210Cr12 (Vickers hardness HV = 750)X155CrVMo121 (Vickers hardness HV = 750)100Cr6 (Vickers hardness HV = 750)X36CrMo17 (Vickers hardness HV = 500)6.1.1.9. Alloyed warm-worked steels accordingto DIN-standard 17350 cured and tempered:PrefaceContents6.1.1.Metals6.1.1.1.Non-alloy-treated steels according toDIN-standard 17100 used for economy-pricedsolutions:St 37-2k – used for low stress applications (1)St 44-2 - used for moderate stress applicationsSt 50-2k – used for medium stress applications (1,5)St 52-3 (Vickers hardness HV=170)6.1.1.2.Alloy-treated, cured and temperedcase-hardened steels according to DINstandard17210 used for longest working life:16MnCr5 – small screws (1,7) (Vickers hardness HV =750)15CrNi6 – thermosetting for big screws (2,1)6.1.1.3.Tempered steels according to DINstandard17200 with a tough core and a hardsurface:C45 – for small screws (1,6) (Vickers hardness HV =170) 42CrMo4 – for big screws (2)6.1.1.4.Stainless steels according to DINstandard17440 susceptible to hardening andtempering:X 20Cr13 Martens steel (3,2)X 20CrNi172 Martens steel (4,0)6.1.1.5.Steels used for surface layer hardeningaccording to DIN-standard 17212 cured andtempered:CF 53 (Vickers hardness HV = 600)6.1.1.6. Stainless cast steel according to DINstandard17445, solution calcined andquenched:G-X30CrNiSiNb2424 (Vickers hardness HV = 280)6.1.1.7. Stainless steels according to DINstandard17115 quenched and tempered:X40CrMoV51 (Vickers hardness HV = 450)6.1.1.10. High speed steels according to DINstandard17350 cured and tempered:S6-5-2 (Vickers hardness HV = 850)6.1.1.11. Recommended protection againstcorrosion:Nickel-plating, e.g. KANIGE or KANISIL 2000;coating thickness depending on the kind of chemicalwear 30 to 50 µm, quenched and tempered from 500 to800 Vickers and ground according to RZ = 1 to 4 µm.6.1.2.NE MetalsAluminium and aluminium alloys should not be used,unless the surface is hard chromed or hard coated. Whenoperating with other NE-metals, we ask you to call ourapplication research department, because here we mustreckon with higher wear due to sliding friction and highercoefficients of friction.6.1.3.PlasticsWe recommend Inkupox CF as an excellent plastics or“screw material”. This material consisting of carbon fiberreinforced epoxide resin showing an outstanding relationof tensile strength/elastic modulus.It is extremely stiff and very light, so that it is highlysuítable for applications in the field of light constructionand when operating with overlength screws.6.1.4. Painted sliding surfacesPainted metallic basic elements can also be used ascounter-rotating surfaces. The main advantage is, thatthe unprotected basic element is protected againstcorrosion due to the paint and the visible counter-rotatingsurfaces can be constructed in all kinds of shades. Inmany cases of application the paint modifications haveturned out to be sufficiently hard wearing in combinationwith ZEDEX-100K.Recommendations of paint are available upon request.MaterialoverviewIndex Slide bearings Slide bearings Conditions ofTribologyMathematical Design(with collar) (cylindrical) installationexample guidelines23MnNiCrMo64 (Vickers hardness HV = 280)Wolf Kunststoff-Gleitlager GmbH • Heisenbergstr. 63 - 65 • 50169 Kerpen-Türnich • Tel. 02237/9749-0 • Fax. 02237/9749-2018
CCCCCC6.2.Hardness of the counter-rotatingpartnerWhen operating with very hard screw materials, the screwdoes not show any wear as well as the wear of the slidebearing is reduced. This is due to the feed wear, whichmeans that the roughness holes on the screw surfaceare filled because of the polymer abrasion, so that thescrew surface becomes smooth.When operating with flexible screw materials anddepending on the plastic sliding partner the roughnesstips on the screw can become subject to abrasion dueto the plastic sliding partner, so that new roughness tipsconstantly break off which avoids the smoothing of thescrew surface.Moreover, the metal particles remaining in the bearingseat cause additional wear.Depending on the demand and the hardness of theemployed slide bearing materials you can take theminimum required hardnesses in function of the ballindentation hardness of the slide bearing material fromtable 7.MaterialBall indentation hardness accordingto DIN -standard 53456H358/30 [N/mm 2 ]ZX-100A 92ZX-100EL63 -ZX-100K 136ZX-100MT 153ZX-324 174ZX-324V1T 175ZX-324V2T 175ZX-324V3T 197ZX-324VMT 231ZX-410 159ZX-530 136ZX-550 34ZX-720 -ZX-750V1 -ZX-750V2 202ZX-750V3 -ZX-750V4 -Table 7 : Ball indentation hardness of ZX-materialsCounter-rotating material (screw)Vickers hardness HV of the steel sliding partner7006005004003002001000economy-priced solutions, low stresslong working life, full load-carrying capacity50 75 100 125 150 175 200 225 250ball indentation hardness H358/60of theplastic bushing[N/mm 2]Ill. 12: Hardness of the counter-rotating materialIllustration 13 enables the conversion into the tensilestrength and other hardness data of the metal slidingpartners with adequate accuracy.2Tensile strength of the steel sliding partner [N/mm ]2.2002.0001.8001.6001.4001.2001.0008006004002000tensile strengthRockwell hardness HRCBrinell hardness HB100 200 300 400 500 600 700Vickers hardness HVIll. 13: Conversion Vickers hardness, Brinellhardness and tensile strength for steelsapproximatelyProvided that dirt and abrasive particles can get into thebearing seat, the hardness of the counter-rotatingmaterial should be chosed harder than that of theabrasive particles. However, we recommend to usegrooved slide bearing bushes as further precaution. Seechapter 8.7065605550454035302520151050Brinell hardness HB and Rockwell hardness HRC of the steel sliding partnerPrefaceContentsMaterialoverviewIndex Slide bearings Slide bearings Conditions ofTribologyMathematical Design(with collar) (cylindrical) installationexample guidelinesWolf Kunststoff-Gleitlager GmbH • Heisenbergstr. 63 - 65 • 50169 Kerpen-Türnich • Tel. 02237/9749-0 • Fax. 02237/9749-2019
Page 3 and 4: CCCCCCContents9.Damping ...........
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Slide bearings - Wolf Kunststoff-Gleitlager GmbH

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