Qhov tob ntawm hardness ntawm bushing hnav coj tsis kam
Raws li qhov ntsuas ntawm cov khoom tsis kam rau hauv zos yas deformation, tab sis kev sib raug zoo ntawm ob qho tsis yooj yim, tab sis los ntawm kev puas tsuaj ntawm kev ua haujlwm, cov neeg ua haujlwm microstructure thiab lwm yam. Cov kev ntsuas hauv qab no los ntawm lub luag haujlwm ntawm lub hauv paus ntsiab lus, cuam tshuam txoj cai lij choj, muaj mob ciam ciam:
Ua ntej, lub ntsiab cai ntawm Hardness thiab hnav tsis kam
1. Inhibitosites nyhuv ntawm hardness ntawm kev hnav ris
(1) kev txav tsis meej coj tswj
Abrasive hnav tswj:Thaum cov khoom siv nyuaj (xws li cov ntaub ntawv hlau thiab hmoov av) tau muab cov khoom siv tawv tawv steel) tsuas yog ua kom cov khoom siv ua kom dej siab tsuas yog tsim saum npoo av tsis sib sib zog nqus.
Cov ntaub ntawv txhawb nqa:45 # STEEL (HB200) nyob rau lubrication lubrication muaj cov sio₂ hais (Hardness HV1000), tus nqi ntawm 0.5mg / h; thiab GCR15 (HRC62) hnav tus nqi qis rau 0.05mg / h, ib tee ntawm 90%.
(2) nplaum hnav kaw kev txwv
Cov txheej txheem me me:Cov ntaub ntawv hardness tsawg (xws li txhuas alloy) nyob rau high {{}} Cov hlau sib tshooj thiab qhov kev tsim tawm ntawm " Cov ntaub ntawv hardness siab (xws li quenched steel) saum npoo av ntawm lub zog siab, lub nodules tsis yooj yim los kua muag, kom cov khoom tsiv teb chaws.
Rooj plaub:Kev sib tham 20 # hlau bushing (HB140) Tom qab 100 teev ntawm kev ua haujlwm tsis muaj lubrication, pom tseeb adhesion pits tau tshwm sim rau saum npoo; Tom qab carburizing thiab quenching rau hrc58, qhov tob ntawm lub pits txo ntawm 0.15mm rau 0.02mm.
2. Synergistic cov nyhuv ntawm Hardness thiab Do nteg microstructure
Ntxiv dag zog los ntawm cov nplej ua kom huv:Cov ntaub ntawv hardness hardness feem ntau nrog cov koom haum sib luag zoo dua (piv txwv li cov kab ke sib txawv ntawm cov kab ke sib txawv ntawm cov khoom siv sib txawv
Lub luag haujlwm ntawm theem ob theem:Cemented carbide bushings (xws li WC - co) hauv cov pob zeb sib npaug
Thib ob. Quantitative Hardness - Hnav Resistance Kev Sib Raug Zoo thiab Tseem Ceeb
1 .near correlation luv (qhuav kev sib txhuam ntawm chav sov)
| Khoom Siv Hardness (Hrc) |
|
Raug Daim Ntawv Teev Lus | ||
| 20-30 | 15-20 | Tsawg - ceev lub teeb - Dest Agricultural Machinery Bushings | ||
| 40-50 | 5-8 | Qib Nruab Nrab Qag Tsho Rau Tsheb Kis | ||
| 60-65 | 0.5-1 | Precision Tshuab Tool Spindle Bushing |
NCO TSEG: Cov ntaub ntawv raws li kev txhuam kom qhuav zawv zawg hnav kev sim (thauj khoom 50N, ceev 0.5m / s)
2. Tsis -} kab hloov tshwm sim tshwm sim zoo (tom qab tshaj qhov tseem ceeb heev)
Kev pheej hmoo ntawm brittle hnav:Thaum lub hardness ntau tshaj li hrc68 (piv txwv li cov bushings ceramic), lub pob txha nqaj tawv tawv ntawm cov khoom (KIC<5MPa/m¹/²) decreases considerably, microcracking occurs under impact loading and the wear rate rises. For example:
SI3N4 Bushings (HRC75) Muaj cov ris luv nqi 3 zaug siab dua HRC62 cov kabmob sib cuam tshuam.
Zoo Hardness Ntau Yam: The optimum hardness for wear resistance of most metal-based bushings is between HRC55-62, where the Vickers hardness (HV) and the logarithm of the wear rate are linearly negatively correlated (R²>0.92).
Qhov thib peb, kev ua haujlwm ntawm kev ua haujlwm ntawm kev ua haujlwm ntawm lub hardness - Nqa cov kev coj tawm tsam kev sib raug zoo
1. Tus cawv ntawm lub xeev lub xeev
Ciam teb lub cev:Nyob rau hauv cov yeeb yaj kiab roj ua tsis tiav (xws li stribeck nkhaus ntawm cov kab kev sib xyaw kua txiv, kom muaj kev ruaj ntseg ntawm cov yeeb yaj kiab oxidation, kom muaj kev nyuaj tshaj plaws ntawm cov khoom sib xyaw ua ke yog qis dua 40%.
Tag nrho {{0} miltefa film lubrication:When the oil film thickness (h>1μm) Ua kom tiav rau qhov chaw saum npoo av, qhov kev cuam tshuam ntawm lub hardness yog tsis muaj zog. Piv txwv li, qhov sib txawv ntawm cov nqi ntawm tooj liab alloy bushing (HB120) thiab cov kabmob steel bushing (hrc62) nyob rau hauv kev siv lub siab lub zog yog <5%.
2. Kub thiab Ceev Coupling nyhuv
Kev kub siab softening kub:45 # STEEL (HRC40) nyob rau hauv 200℃thaum lub hardness dauv rau HB180, hnav tus nqi ntau dua li chav sov nce 2.5 zaug; Thiab cua sov -} Cov hlau tiv taus (xws li 1cr13, hrc50) hauv 300℃thaum lub hardness retention tus nqi> 90%.
Siab - ceev thermal effect:Thaum cov kab lus tshaj tawm> 10M / s, siab cov khoom siv hardness (ceramics nrog kev sib txhuam cov cua sov uas yuav tau thim rov qab kom dhau los ntawm nruab nrab- hat hand hlau (xws li tooj dag).
Qhov thib plaub, kev ua kom ua tau zoo rau lub tswv yim zoo hauv kev siv daim ntawv thov engineering
1. Gradient hardness tsim
Cov txheej txheem tawv:Kev siv ntawm nitriving (hardness ntawm infiltration txheej hv900-1200), live hrc65-70) thiab lwm yam kev siv hluav taws xob, yog li ntawd saum npoo ntawm bushing zog tseem ceeb. Piv txwv li:
Tom qab Camshaft bushing ntawm tsheb lub cav yog ion hnav yog txo los ntawm tag nrho cov sij hawm, tus brittle bacture ntawm cov tub ntxhais yog zam.
2. Sib txuam ntawm kev tawv tawv thiab lwm yam khoom
Hardness -} kev sib npaug sib npaug:Kev siv cov tshuab bushings (piv txwv li excavator hla ncej bushings bushings) yuav tsum tau muaj kev cuam tshuam ntawm bushings thiab txuas ntxiv rau lub neej ntawm bushings los ntawm 1.8 lub sij hawm piv rau HRC60 Bushings.
Hardness - corrosion resistance:Dej hiav txwv bushing xaiv 316L Stainless Hlau (HRC28 {{{}} 32) ,, txawm hais tias lub neej chrome - plated steel (hrc60, lub neej ntawm 5000 teev) ntev dua.
Tsib, Kev Ua Haujlwm tsis raug cai thiab kev tshawb xyuas hardness
1. Abrasive hnav tsis ua hauj lwm (tsuas machinery)
Ua tsis tiav prenomenon:Ib qho crusher ntxaiv bushing (45 # steel, HB220) khiav 3 lub hlis tom qab lub taub dej sab hauv ntau dua li cov nqi tso cai ntawm 0.1mm.
Kev pom zoo nyuaj: Ore plua plav (Hardness HV800-1200) deb dhau ntawm cov npoo av, thiab nws tau pom zoo kom siv lub neej pabcuam ntau tshaj 1 xyoo {4}
2. Adhesive Tsho Ua Tsis Zoo (Compressor)
Ua tsis tiav: aluminium alloy bushing (HB90) tau clutched ntawm Start-} hloov cov kab tau tshwm sim rau saum npoo.
Kev ntsuas kev txhim kho: tawv chrome plating (HV1000) ntawm cov npoo av tau nce los ntawm 2m / s, uas daws qhov teeb meem ntawm cov teeb tsa.
Ntsiab lus:Kev cuam tshuam ntawm kev tawv ntawm kev coj ua ntawm bushing ua raws txoj cai ntawm "kev sib raug zoo ntawm cov" kev sib txheeb zoo nyob rau hauv lub caij nyoog zoo, tsis yog linear tom qab dhau tus nqi pib ". Hauv kev tsim qauv engineering, nws yog ib qho tsim nyog los ua ke hom hnav (cov khoom siv harcastion) thiab cov khoom siv nrawm nrawm dua (yog li ua kom muaj kev kub ntxhov ntawm cov ntoo ntawm lub neej.
Tiv Tauj Peb
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