Force tsom xam thoob cov hniav ua hauj lwm lub ntsej muag thiab cov khoom excavated tiv tauj, nyob rau hauv ib tug ua tiav excavation txheej txheem nyob rau hauv txawv kev ua hauj lwm theem ntawm nws txawv kev nyuaj siab tej yam kev mob.Thaum tus hniav ntaj thawj kov cov khoom nto, lub thoob hniav hau yog muaj kev cuam tshuam heev vim nws ceev ceev. Yog hais tias lub zog ntawm cov thoob cov hniav tsis tshua muaj, cov yas deformation yuav tshwm sim ntawm lub taub.Nrog qhov nce ntawm khawb qhov tob, qhov kev ntxhov siab ntawm cov hniav yuav hloov.Thaum lub thoob cov hniav txiav cov khoom, cov thoob hniav thiab cov khoom tshwm sim txheeb ze, ua rau lub zog loj heev extrusion siab rau ntawm qhov chaw, yog li ua kom muaj kev sib txhuam loj ntawm lub thoob cov hniav ua haujlwm lub ntsej muag thiab cov khoom siv.Yog cov khoom siv yog cov pob zeb tawv, pob zeb, thiab lwm yam, kev sib txhuam yuav loj heev.Qhov tshwm sim ntawm qhov rov ua dua. qhov kev txiav txim ntawm cov txheej txheem no ua rau cov qib sib txawv ntawm qhov chaw hnav ntawm lub thoob cov hniav ua hauj lwm lub ntsej muag, thiab tom qab ntawd ua rau cov furrow nrog ntau dua qhov tob.Bucket hniav muaj pes tsawg leeg zoo cuam tshuam rau qhov ntev ntawm kev pab cuam lub neej ntawm thoob cov hniav, xaiv thoob cov hniav ntawm chav kawm ntau ceev faj daddus muag. Cov hniav thoob kuv kuj tau siv nws cov hniav thoob, cov nyhuv yog qhov zoo! Qhov zoo ntawm lub ntsej muag ua haujlwm yog pom tseeb ntau dua li ntawm lub ntsej muag ua haujlwm tom qab, thiab lub ntsej muag ua haujlwm hauv ntej yog hnav tsis zoo. Nws tuaj yeem txiav txim siab tias qhov zoo siab thiab kev sib txhuam quab yuam yog qhov tseem ceeb ntawm cov khoom siv sab nraud rau qhov tsis ua haujlwm ntawm cov hniav, uas ua lub luag haujlwm tseem ceeb hauv cov txheej txheem tsis ua haujlwm.
Cov txheej txheem kev soj ntsuam: coj ob qho qauv ntawm lub ntsej muag ua haujlwm pem hauv ntej thiab sab nraub qaum, thiab zom lawv tiaj tus rau kev sim hardness.Nws pom tias qhov hardness ntawm tib tus qauv txawv heev, thiab qhov kev txiav txim ua ntej yog tias cov khoom tsis sib xws. cov qauv yog hauv av, polished thiab corroded, thiab nws tau pom tias muaj cov ciam teb pom tseeb ntawm txhua tus qauv, tab sis cov ciam teb sib txawv.Los ntawm macro taw tes ntawm view, qhov chaw ib puag ncig yog lub teeb grey thiab qhov nruab nrab yog tsaus, qhia tau hais tias lub piece yog tej zaum ib tug inlaid casting. Nyob rau saum npoo, qhov uas nyob ib sab yuav tsum yog ib qho inlaid block.Qhov kev ntsuam xyuas hardness ntawm ob sab ntawm tus ciam teb tau ua tiav ntawm teev-150 digital zaub rockwell hardness tester thiab mhv-2000 digital display microhardness tester, thiab qhov sib txawv tseem ceeb tau pom. Qhov uas nyob ib puag ncig yog ib qho ntxig thaiv thiab ib puag ncig yog ib qho matrix.Qhov kev sib xyaw ntawm ob yog zoo sib xws. Lub ntsiab alloy muaj pes tsawg leeg (feem ntau, %) yog 0.38c, 0.91cr, 0.83mn thiab 0.92si.Cov khoom siv ntawm cov hlau yog nyob ntawm lawv cov muaj pes tsawg leeg thiab kev kho cua sov txheej txheem.Qhov sib xws thiab qhov sib txawv ntawm hardness qhia tias lub thoob cov hniav tau muab tso rau hauv kev siv yam tsis muaj kev kho cua sov tom qab casting.Cov ntaub so ntswg tom qab kev soj ntsuam paub meej tias qhov no.
Lub koom haum tsom xam ntawm metallographic soj ntsuam pom tau hais tias lub substrate feem ntau yog dub zoo lamellar qauv, teem daim ntaub so ntswg muaj ob feem, fritter dawb thaiv thiab dub, thiab dawb thaiv kom deb ntawm tus ntoo khaub lig seem cheeb tsam koom haum ntau (thiab ntxiv microhardness test proves tias lub lub koom haum rau ferrite dawb thaj ua rau thaj, dub zoo lamellar qauv ntawm troostite los yog troostite thiab pearlite hybrid lub koom haum.Qhov tsim ntawm bulk ferrite nyob rau hauv lub insert yog zoo ib yam li ntawm ib co theem hloov chaw nyob rau hauv lub tshav kub cuam tshuam cheeb tsam ntawm vuam.Raws li qhov kev txiav txim ntawm hlau ua kua kub thaum lub sij hawm casting, cheeb tsam no yog nyob rau hauv austenite thiab ferrite ob-theem cheeb tsam, qhov twg cov ferrite yog tag nrho cov loj hlob thiab nws cov microstructure yog khaws cia rau hauv chav tsev kub.Vim hais tias lub thoob hniav phab ntsa yog kuj nyias thiab cov insert block ntim yog loj, lub qhov nruab nrab ntawm qhov ntxig thaiv qhov kub yog qhov tsawg, tsis muaj ferrite loj tsim
Kev coj mus kuaj ntawm mld-10 coj lub tshuab kuaj pom tias hnav tsis kam ntawm matrix thiab ntxig yog zoo dua li ntawm quenched 45 steel nyob rau hauv cov xwm txheej ntawm kev cuam tshuam me me hnav kuaj.Meanwhile, hnav tsis kam ntawm matrix thiab cov ntxig ntxig sib txawv, thiab cov matrix yog hnav-tiv taus ntau dua li cov ntxig ntxig (saib cov lus 2).Qhov muaj pes tsawg leeg ntawm ob sab ntawm matrix thiab cov ntxig ntxig yog nyob ze, yog li nws tuaj yeem pom tau tias cov ntxig rau hauv cov thoob cov hniav feem ntau ACTS raws li lub chiller. cov txheej txheem ntawm casting, cov matrix grain yog refined los txhim kho nws lub zog thiab hnav tsis kam.Vim lub zog ntawm casting tshav kub, cov qauv ntawm cov ntxig yog zoo ib yam li cov vuam tshav kub cuam tshuam cheeb tsam.Yog hais tias kev kho cua sov kom zoo yog nqa tawm tom qab. casting los txhim kho cov qauv ntawm matrix thiab ntxig, hnav tsis kam thiab kev pabcuam lub neej ntawm cov hniav yuav pom tseeb.
Post lub sij hawm: Apr-15-2019