Ntawm covpressure bearing li qub of industrial pipelines, cam khwb cia steel li qubtau dav siv vim lawv cov nqi kev lag luam thiab kev tsim qauv yooj yim.Txawm li cas los xij, vim tias cov txheej txheem casting raug txwv los ntawm qhov loj, phab ntsa tuab, kev nyab xeeb, cov khoom siv raw thiab kev tsim kho ntawm cov casting, ntau yam kev tsis xws luag xws li hlwv, pores, tawg, shrinkage porosity, shrinkage kab noj hniav thiab inclusions yuav tshwm sim nyob rau hauv lub castings, tshwj xeeb tshaj yog xuab zeb casting alloys.Hlau castings rau ntau yam.Vim tias cov hlau alloying ntau dua nyob rau hauv cov hlau, qhov tsis zoo ntawm cov hlau molten, qhov yuav ua rau muaj qhov tsis xws luag.Yog li ntawd, kev txheeb xyuas qhov tsis xws luag thiab kev tsim cov txheej txheem tsim nyog, kev lag luam, siv tau thiab txhim khu kev qha kho vuam txheej txheem kom ntseeg tau tias lub valve tom qab kho vuam ua tau raws li qhov yuav tsum tau ua tau dhau los ua ib qho kev txhawj xeeb hauv kev ua haujlwm kub thiab txias.li qub.Qhov tsab xov xwm no qhia txog kev kho vuam txoj kev thiab kev paub ntawm ntau yam steel hlau tsis xws luag (lub vuam pas nrig yog sawv cev los ntawm lub qub hom).
Kev tuav tsis raug
1. Kev txiav txim tsis raug
Hauv kev xyaum ua ntau lawm, qee qhov kev tsis xws luag tsis raug tso cai los kho vuam, xws li nkag mus rau cov kab nrib pleb, nkag mus rau qhov tsis xws luag (dhau hauv qab), honeycomb pores, xuab zeb inclusions uas tsis tuaj yeem tshem tawm, thiab shrinkage porosity nrog thaj tsam tshaj 65 square centimeters, thiab lwm yam. thiab Lwm yam tsis xws luag uas tsis tuaj yeem kho tau raws li kev pom zoo hauv daim ntawv cog lus ntawm ob tog.Hom kev puas tsuaj yuav tsum raug txiav txim ua ntej kho vuam.
2. Kev tshem tawm tsis zoo
Hauv lub Hoobkas, carbon arc cua gouging feem ntau yog siv los tshuab tawm qhov tsis xws luag, thiab tom qab ntawd lub kaum sab xis txav tau siv los txhuam cov khoom tsis zoo kom pom cov xim hlau.Tab sis nyob rau hauv kev xyaum ntau lawm, nws yog ntau dua los siv carbon steel electrode nrog siab tam sim no los tshem tawm qhov tsis xws luag, thiab siv lub kaum sab xis grinder los zom tawm cov hlau nplaum.Feem ntau, casting qhov tsis xws luag tuaj yeem raug tshem tawm los ntawm kev siv <4mm-J422 electrode thiab tam sim no ntawm 160-180A kom tshem tawm qhov tsis xws luag.Lub kaum sab xis grinds qhov tsis xws luag rau hauv U zoo kom txo tau qhov kev ntxhov siab ntawm vuam.Qhov tsis xws luag raug tshem tawm tag nrho, thiab kev kho vuam zoo yog qhov zoo.
3. Preheating ntawm cov khoom puas
Rau cov pa roj carbon steel thiab austenitic stainless hlau castings, qhov chaw ntawm qhov kho qhov vuam yog tsawg dua 65cm2 thiab qhov tob yog tsawg dua 20% lossis 25mm ntawm thickness ntawm cov casting, feem ntau tsis tas yuav tsum preheating.Txawm li cas los xij, rau pearlitic steel castings xws li ZG15Cr1Mo1V thiab ZGCr5Mo, vim lub siab hardening nyiam ntawm cov hlau thiab yooj yim tawg nyob rau hauv txias vuam, preheating yuav tsum tau ua.Lub sijhawm tuav yuav tsum yog tsawg kawg 60 feeb.Yog hais tias lub casting tsis tuaj yeem preheated tag nrho, nws tuaj yeem ua kom sov rau 300-350 ° C nrog cov pa oxygen-acetylene ntawm qhov chaw tsis raug thiab nthuav dav li 20 hli (saib cov xim liab tsaus nti hauv qhov tsaus ntuj), thiab lub teeb taws loj nruab nrab. phom yog siv ua ntej ntawm qhov tsis xws luag thiab ib puag ncig.Ua viav vias lub voj voog sai sai rau ob peb feeb, tom qab ntawd maj mam txav mus rau 10 feeb (nyob ntawm qhov tuab ntawm qhov tsis xws luag), kom qhov tsis xws luag yog tag nrho preheated thiab kho sai sai.
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