Hnav-resistant alloy overlay vuam thev naus laus zis rau cov qauv kev xa khoom txawv teb chaws thiab nws qhov kev hloov kho rau hnyav- cov kab thauj khoom
Dab tsi yog cov txheej txheem xaiv cov khoom siv tseem ceeb rau kev hnav- cov txheej txheem tiv thaiv cov txheej txheem ntawm lub taub hau ntawm cov txheej txheem txawv teb chaws?
Cov txheej txheem kev xaiv cov khoom tseem ceeb rau kev hnav- cov txheej txheem alloy resistant surfacing ntawm lub taub hau ntawm cov txheej txheem txawv teb chaws yogsiab hardness, siab toughness thiab zoo surfacing compatibility, thiab cov khoom siv feem ntau yog hlau-raws li hnav- cov alloys resistant thiab npib tsib xee{2}}raws li hnav- cov alloys resistant. Lub hardness ntawm hlau-raws li hnav- cov alloys resistant tuaj yeem ncav cuag HRC60-65, uas muaj cov hlau alloy xws li chromium, molybdenum thiab vanadium. Lub chromium carbide reinforcement theem tsim los ntawm chromium tuaj yeem txhim kho kev hnav tsis kam, molybdenum txhim kho cov tawv tawv ntawm cov hlau, thiab vanadium refines cov nplej. Cov khoom no muaj tus nqi qis thiab tsim nyog rau hnyav- cov kab nrog nruab nrab qag load. Lub hardness ntawm nickel{13}}raws li hnav- cov alloys resistant yog HRC58-62, uas muaj toughness zoo dua li hlau-raws li alloys thiab muaj zog tiv thaiv. Nws yog haum rau hnyav-haul kab nrog loj qag load thiab siab, xws li North American AAR txheem 30t qag load kab. Lub surfacing compatibility ntawm cov khoom yuav tsum zoo metallurgical compatibility nrog lub hauv paus hlau ntawm txawv teb chaws tus qauv rails, tsis muaj kab nrib pleb, pores thiab lwm yam tsis xws luag tom qab surfacing, thiab dilution tus nqi yuav tsum tau tswj ntawm 10% -15% kom tsis txhob muaj kev ua tau zoo degradation ntawm cov hlau txheej.
Dab tsi yog cov txheej txheem txheej txheem thiab cov yam ntxwv ntawm kev hla ntawm lub taub hau ntawm txoj kev tsheb ciav hlau txawv teb chaws?
Cov txheej txheem tseem ceeb ntawm surfacing ntawm lub tsheb ciav hlau lub taub hau ntawm txawv teb chaws tus qauv rails yogqhib arc tsis siv neeg surfacing, ntxiv los ntawm preheating thiab post-welding heat preservation treatment, nrog rau cov yam ntxwv ntawm high efficiency thiab precision. Ua ntej surfacing, nws yog tsim nyog los preheat lub tsheb ciav hlau lub taub hau mus rau 200-250 degree, thiab lub preheating ntau yam yog 50 hli ntawm ob sab ntawm lub tsheb ciav hlau lub taub hau kom txo tau qhov kub thiab txias gradient thaum ntog thiab txo vuam tawg. Surfacing txais ib tug tshwj xeeb surfacing neeg hlau, vuam tam sim no yog tswj ntawm 200-250A, lub arc voltage yog 25-30V, thiab vuam ceev yog 150-200mm / min los xyuas kom meej uniform thickness ntawm cov alloy txheej, thiab lub thickness ntawm lub surfacing txheej yog tswj ntawm 5-8mm. Tom qab vuam, kev kho cua sov yuav tsum tau nqa tawm: muab cov tsheb ciav hlau tso rau hauv lub tshav kub tiv thaiv npog thiab txias nws maj mam mus rau chav sov nrog qhov cua txias tsawg dua lossis sib npaug li 50℃/ h kom tshem tawm cov kev ntxhov siab ntawm cov welding. Cov yam ntxwv ntawm cov txheej txheem no yog kev ua haujlwm siab tshaj plaws, lub sij hawm surfacing ntawm ib qho kev tsheb ciav hlau tsawg dua los yog sib npaug li 2 teev, lub zog sib txuas ntawm cov txheej txheem hlau thiab cov hlau hauv paus yog ntau dua los yog sib npaug rau 450MPa, thiab hnav tsis kam yog 3-4 zaug siab dua li ntawm cov thawj rail.
Dab tsi yog qhov sib txawv tsim ntawm surfacing tsis rau txawv txawv teb chaws qauv rail qauv?
Qhov sib txawv tsim ntawm surfacing tsis rau txawv txawv teb chaws qauv rail qauv yog core rautxuam cov rail puag hlau muaj pes tsawg leeg thiab ntoo khaub lig-sectional dimensions. Rau EU EN54E1 rails nrog lub hauv paus hlau ntawm U71Mn, lub surfacing tam sim no yog 200{19}}220A, lub arc voltage yog 25-27V, surfacing txheej thickness yog 5-6 hli, thiab tus nqi dilution yog tswj ntawm 10% -12% kom tsis txhob muaj ntau dhau ntawm cov khoom siv los ntawm lub hauv paus hlau. Rau North American AAR136RE rails nrog lub hauv paus hlau ntawm T1 steel thiab loj qag load, surfacing tam sim no yog 230-250A, lub arc voltage yog 28-30V, surfacing txheej thickness yog 7-8 hli, thiab tus nqi dilution yog tswj ntawm 12% -15% los txhim kho cov kabmob muaj peev xwm ntawm cov hlau txheej. Rau Australian AS1085.1 rails nrog nqaim rail head cross-section, surfacing ceev yuav tsum tau nce mus rau 180-200mm / min, thiab vuam tam sim no yog 210-230A los xyuas kom meej tias cov surfacing txheej npog tag nrho cov rail head contact nto yam tsis muaj qhov chaw vuam. Qhov sib txawv ntawm kev tsim cov txheej txheem saum npoo yuav tsum raug txheeb xyuas los ntawm kev ntsuas vuam los xyuas kom meej tias qhov sib txawv ntawm qhov ncaj ntawm txoj kev tsheb ciav hlau tom qab ntog yog tsawg dua lossis sib npaug ntawm 0.5mm / m.
Dab tsi yog qhov kev lees paub kev hloov pauv ntawm cov txheej txheem txawv teb chaws nrog kev hnav khaub ncaws saum npoo- cov khaubncaws sab nraud povtseg rau hnyav- cov kab?
Txoj kev ua pov thawj kev hloov pauv ntawm cov txheej txheem txawv teb chaws nrog kev hnav khaub ncaws saum npoo- cov khaubncaws sab nraud povtseg rau hnyav- cov kab muaj ob qhov txuas:Laboratory xeem kev ua tau zoo thiab ntawm -site sim nteg test. Kev ntsuas kev ua haujlwm hauv chav kuaj muaj xws li kev sim hardness, kuaj hnav thiab kuaj qhov cuam tshuam. Kev ntsuas hardness yuav tsum muaj qhov nyuaj ntawm cov txheej saum npoo loj dua lossis sib npaug ntawm HRC60, qhov nyuaj ntawm lub hauv paus hlau yog HRC30-35, thiab qhov nyuaj ntawm qhov hloov pauv yog ib yam; coj mus kuaj siv tus pin-ntawm-disk hnav kuaj tshuab, qhov hnav tsis zoo yuav tsum tsawg dua lossis sib npaug li 0.1mg / m, uas yog ntau dua 70% qis dua li ntawm cov tsheb ciav hlau qub; Kev ntsuam xyuas kev cuam tshuam yog ua tiav ntawm qhov kub qis ntawm -40 degree, qhov cuam tshuam lub zog loj dua lossis sib npaug li 30J kom ntseeg tau tias cov txheej txheej alloy tsis muaj qhov tawg. Qhov ntawm - qhov chaw sim nteg qhov kev sim xaiv ib feem ntawm qhov hnyav- txoj kab uas hla nrog qhov ntev ntev dua lossis sib npaug li 1 km thiab lub sijhawm saib xyuas ntawm 1 xyoo. Cov ntsuas ntsuas suav nrog kev tsheb ciav hlau lub taub hau hnav, log-rail kev sib cuag kev nyuaj siab thiab kev sib koom ua ke smoothness. Qhov kev sim nteg cov txiaj ntsig xav tau tias qhov hnav txhua xyoo ntawm lub taub hau tsheb ciav hlau tsawg dua lossis sib npaug li 1 hli, lub siab tshaj plaws log-rail kev sib cuag kev ntxhov siab yog tsawg dua lossis sib npaug li 800MPa, thiab cov ntsuas kev sib tw ua tau raws li cov qauv kev ua haujlwm.
Dab tsi yog qhov ntawm - qhov chaw vuam thiab tu cov ntsiab lus ntawm txawv teb chaws tus qauv rails nrog surfacing hnav- cov txheej txheem alloy resistant?
Nyob rau ntawm - qhov chaw vuam thiab kev saib xyuas ntawm txawv teb chaws tus qauv rails nrog surfacing hnav- resistant alloy txheej yuav tsum tau tsom rauwelding txheej txheem hloov thiab surfacing txheej hnav xyuas. Ntawm - qhov chaw vuam siv cov txheej txheem flash pob tw. Ua ntej welding, nws yog ib qho tsim nyog yuav tsum tau zom thiab tshem tawm 2-3 hli ntawm cov txheej saum npoo kom nthuav tawm cov hlau hauv paus, zam cov txheej txheej alloy cuam tshuam rau vuam zoo. Tom qab vuam, kev kho mob hauv zos yuav tsum tau nqa tawm ntawm qhov sib koom ua ke ntawm qhov kub ntawm 400-450℃rau 1 teev. Thaum lub sij hawm txij nkawm, nws yog ib qho tsim nyog yuav tsum tsis tu ncua xyuas cov thickness ntawm cov txheej saum npoo nrog lub ntsuas ultrasonic thickness. Thaum hnav thickness tshaj 3 hli, kho vuam yuav tsum tau nqa tawm nrog tib yam tsis raws li tus thawj surfacing. Tsis tas li ntawd, nws yog ib qho tsim nyog yuav tsum tsis tu ncua grind lub tsheb ciav hlau lub taub hau nto kom tshem tawm qaug zog tawg thiab hnav cov kauj ruam. Kev sib tsoo lub voj voog yog 6 lub hlis, thiab cov nyiaj sib tsoo yog tswj ntawm 0.1-0.2mm los xyuas kom meej lub log-rail hu rau lub xeev. Nyob rau tib lub sijhawm, txheej txheej saum npoo yuav tsum tau tiv thaiv los ntawm kev tiv thaiv cov tshuaj acidic kom tsis txhob xeb ntawm cov hlau txheej.