Nazari kan samar da hanyar haɗa slag na simintin ƙarfe a cikin epc

1 Yaɗuwar lahani na haɗaɗɗen slag a cikin simintin ƙarfe tare da epc

 

Yana da matukar wahala a samar da simintin ƙarfe tare da ɓataccen ƙwayar cuta. A halin yanzu, yawancin su suna jure lalacewa, juriya da zafi da juriya da lalata ba tare da sarrafawa ko ƙarancin sarrafawa ba, ko wasu simintin simintin bango. Babban dalilai na lahani na ƙananan simintin ƙarfe na carbon karfe shine rashin daidaituwa na carburization da lahani na haɗakarwa na kauri da manyan sassa. Don simintin ƙarfe tare da ƙayyadaddun kauri da yawancin ƙananan simintin ƙarfe na carbon, rabon carburization, haɗaɗɗen slag ko lahani ya fi 60%, wanda ke sa ƙarancin ƙarfe na carbon da kauri mai kauri ya zama matsala mai wahala na ɓataccen tsarin simintin gyare-gyare, har ma da la'akari da cewa tsarin simintin gyare-gyaren da aka rasa bai dace da simintin ƙarfe ba.

 

1.1 Lalacewar nau'ikan simintin ƙarfe na epc

 

Lalacewar simintin ƙarfe na epc shine haɗaɗɗen slag, porosity da carburization. Siffar lahani ba na yau da kullun ba ne, gefen lahani ba shi da ka'ida, kuma ƙarancin lahani yana tarwatse sosai, wanda ke bayyana a cikin inuwar launi daban-daban akan zane na ƙarfe. Siffar tarawa na lahani galibi ita ce sifar tari tare da iyaka mai duhu da tarwatsa launi, wanda ke da wahalar cirewa ta hanyar sarrafawa.

 

1.2 Matsakaicin lahani a cikin ɓangarorin simintin gyare-gyaren ƙarfe

 

Adadin lahani a cikin simintin ƙarfe na epc yana da girma sosai. Ciki har da lalacewa -, zafi - da simintin gyare-gyare masu jure lalata, ko wani siriri - da simintin ƙarfe mai kauri, ba tare da injina ko ba tare da yin amfani da shi ba. Don simintin gyare-gyaren ƙarfe na bango, lahanin galibin pores ne da ramukan slag a tushen ƙofar ko tashi. Don simintin gyare-gyare na bango mai kauri, lahanin galibin lahani ne na subcutaneous. Don ƙananan simintin ƙarfe na ƙarfe, lahanin galibin lahani ne marasa daidaituwa.

 

1.3 Sassan masu saurin kamuwa da lahani na epc simintin gyaran ƙarfe

 

Kaurin bango da abun cikin carbon na simintin ƙarfe na epc sun bambanta a cikin sassan da lahani ke da sauƙin faruwa. Don katangar bakin ciki simintin gyare-gyare uku masu juriya, galibi suna fitowa a cikin simintin gyare-gyare da ƙofa ko sassan da aka haɗa. ɓangarorin da ke da alaƙa da tsarin cika simintin simintin gyare-gyare, kwararar ruwa na dogon lokaci, don kiyaye lokacin zafi ya fi tsayi, narkakken ƙarfe ya yi zafi da kayan ƙura, kayan ƙirƙira, narkewar juzu'i yana ɗaukar ƙarin iskar gas a cikin ƙarfen ruwa da tarin slag ta hanyar toshe. , narkakkar karfe sanyaya da solidification shrinkage, sauki sa wadannan sassa bayan sanyaya solidification form rami, shrinkage porosity, slag gauraye lahani.

 

2. Musamman na mold cika na epc simintin karfe

 

Ana samun lahani na simintin gyare-gyare a lokacin da ake cika simintin gyare-gyare tsarin ƙarfafawa, gabaɗaya lokacin cika ƙanana da matsakaicin simintin gyare-gyare gajeru ne, kuma lokacin cika manyan simintin ma gajeru ne. Daban-daban da simintin gyare-gyare na yau da kullun, musamman na cikon mold na epc simintin gyare-gyare shine babban dalilin ƙaddamar da lahani na simintin ƙarfe na epc.

 

2.1 Ciko nau'in simintin ƙarfe na epc

 

Dangane da tsarin cika ƙarfe na ruwa na epc, yawancin binciken sun dogara ne akan tsarin cika epc don alloy na aluminium, kuma yawancinsu suna cike ba tare da matsananciyar matsa lamba ba. A karkashin irin waɗannan yanayi, siffar cikawar ƙarfe na ruwa shine bayan shigar da "ragon" na simintin gyare-gyare daga ƙofar ciki, gaban ruwa na gaba yana matsawa gaba a cikin siffar fan. Ƙarƙashin aikin nauyi, ƙarfe mai cike da ruwa na gaba yana lalacewa zuwa ƙasa, amma yanayin gaba ɗaya shine a tura daga ƙofar ciki har sai an cika "ramin". Siffar iyaka ta lamba tsakanin ƙarfe na ruwa da siffa yana da alaƙa da zafin jiki na ƙarfe na ruwa, kaddarorin kayan siffa da saurin cikawa. Idan yawan zafin jiki na ƙarfen ruwa ya fi girma, girman siffar ya zama ƙarami kuma saurin cikawa yana da sauri, gabaɗayan saurin ci gaban ƙarfen ruwa yana da sauri. Ya bambanta da nau'in gami, zazzabi mai zub da ruwa, yankin sprue, saurin zubowa, girman bayyanar, ƙarancin zafin iska na shafi da matsa lamba mara kyau. Domin aluminum gami ba tare da korau matsa lamba zuba, da ke dubawa tsakanin ruwa karfe da kuma siffar za a iya raba hudu model bisa ga yanayi daban-daban: lamba yanayin, yarda yanayin, auka yanayin da hannu yanayin.

 

2.2 Rubutun ilimin halittar jiki da tasirin abin da aka makala bango na cika ƙarfe na ruwa

 

A cikin mold a cikin samar da jefa karfe, Cast baƙin ƙarfe guda, kamfanonin kasar Sin suna kan aiwatar da Fitar kallafa korau matsa lamba a kan bushe yashi simintin, don ƙara ja da bushe yashi mold, sa mold tare da isasshen ƙarfin da kuma rigidity, su yi tsayayya da tasiri na ruwa karfe da buoyancy, tabbatar da cikakken zuba da ƙarfafawa a cikin tsari yadda ya kamata, don samun cikakken tsarin simintin gyare-gyare. Busassun yashi mold yana da isasshen ƙarfi da taurin kai ba tare da ƙara tsayin akwatin yashi ba. Yana taka muhimmiyar rawa wajen haɓaka fasahar simintin simintin ɓata.

 

3 Nazari na tushen da thermodynamics da motsa jiki na haɗakar da slag a cikin narkakken ƙarfe

 

Akwai hanyoyi da yawa na slag da gas a cikin narkakkar karfe, ciki har da ragowar da iskar gas na kayayyakin pyrolysis kamar gasification, ragowar da iskar gas da aka samar a cikin aikin narkakken ƙarfe, da ragowar oxide da aka samu ta hanyar oxidation na narkakkar karfe, da rushewar. na wasu iskar gas ta matsanancin zafi narkakkar karfe. Saboda ƙananan ƙarancin waɗannan ɗigon ruwa da iskar gas, za su yi iyo sama sannu a hankali a cikin tsarin cikawa da tsarin sanyaya ruwa kafin ƙarfafawa, kuma su yi iyo zuwa ƙananan matsa lamba ƙarƙashin aikin matsi mara kyau.

 

4 Hanyoyi da shawarwari don rage slag hada sassan karfe tare da ɓataccen simintin gyare-gyare

 

4.1 Kai tsaye rage ainihin abubuwan da aka haɗa a cikin narkakken ƙarfe

 

Rage abubuwan da aka haɗa a cikin narkakkar karfe kafin zubawa ɗaya ne daga cikin manyan hanyoyin da za a rage lahani a cikin simintin gyare-gyare. Akwai hanyoyi da yawa don tsarkake narkakkar karfe, kamar yin amfani da slagging abu, dogara a kan adsorption na tsarkakewa wakili a kan hadawa, adsorbed da kananan barbashi na hada a kan manyan barbashi na kara tsarkakewa wakili, forming mafi girma girma na hadawa. barbashi, wanda yake da amfani don inganta yanayin yanayi mai ƙarfi na iyo.

 

4.2 Rage haɗawa a cikin narkakken ƙarfe ta hanyar matakan fasaha da ƙarfafa fitar da abubuwan da aka haɗa.

 

(1) M zane na zuba riser tsarin. Kamar yadda zai yiwu tare da simintin akwatin ƙasa da ɗaya, gwargwadon yiwuwar rage wanzuwar narkakkar ƙarfe a cikin lokacin tsarin zubewa, wato, rage ko soke mai gudu; Fiye da akwati guda ɗaya babu makawa zai sa tsarin zuƙowa ya yi tsayi sosai. Lokacin da narkakkar karfe ya cika da tsarin zubar da ruwa, yana da sauƙi don samar da tashin hankali da fantsama a cikin multi-lankwasa da madaidaicin sashin tashar tsarin zubar da ruwa, wanda ke rage yawan zafin jiki na narkakkar, yana haifar da zub da jini na karfe, ya zana bangon gefe. na sprue, da kuma ƙara asali inclusions a cikin narkakkar karfe.

 

(2) rage bayyanar mahaɗin mannewa. Girman tazarar haɗin siffa mai yawa, mai sauƙin haifar da ratar tare da canji mai yawa a cikin manne, yana haifar da mannen haɗin gwiwa convex ko concave. Saboda mafi girma da yawa na convex m, iskar gas da sauran da aka samar bayan gasification sun fi yawa, wanda ya haifar da karuwar yawan adadin slag; Manne concave manne yana haifar da tazara, lokacin da aka rufe, rufin da ke da ƙarfi mai ƙarfi yana shiga cikin sauƙi.

 

(3) Dace rage matsa lamba mara kyau. Matsi mara kyau shine dalili mai mahimmanci na ƙara yawan tashin hankali wanda ya haifar da narkakken karfe. Ƙarar tashin hankali yana haifar da narkakkar ƙarfe don zazzage tsarin zub da ruwa da bangon “ragon”, da narkakkar ƙarfen ya fantsama da yawa, yana samar da juzu'i mai gudana, cikin sauƙi cikin haɗawa da iskar gas. Hanyar da ta dace ita ce saduwa da ƙarfin da ya dace da busassun simintin yashi da kuma tabbatar da cewa simintin ba ya rushewa a cikin aiwatar da zubar da cikawa, ƙananan matsa lamba mara kyau, mafi kyau.

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Lokacin aikawa: Satumba-24-2021