Nyob rau hauv tus txheej txheem ntawmprecision casting, chilling cov ntaub ntawv - feem ntau hu ua chills - yog qhov tseem ceeb rau kev tswj cov cua txias ntawm cov hlau molten. Lub txias txias yog ib qho cua txias tso rau hauv lub pwm kab noj hniav los yog ntawm qhov chaw ua hauj lwm kom ceev hauv zos solidification. Kev siv cov khoom siv chilling kom zoo rau kev txiav txim siab zoo tuaj yeem cuam tshuam cov qauv, qhov ntom ntom, thiab kev ua haujlwm zoo ntawm cov khoom kawg.
Nyob rau hauv feem ntau precision casting kev khiav hauj lwm, chills ua hauj lwm nyob rau hauv kev sib koom tes nrog lub rooj vag thiab riser systems. Lawv lub hom phiaj ua ke yog coj cov txheej txheem solidification, tsis txhob shrinkage defects, thiab xyuas kom meej tias castings ua tiav qhov xav tau lub zog thiab qhov tseeb qhov tseeb. Yog li ntawd, kev xaiv cov khoom chilling rau precision casting yog ib qho tseem ceeb hauv kev tsim thiab tsim cov txheej txheem.
Ntau yam khoom siv tuaj yeem siv rau txias txias, tab sis lawv yuav tsum muaj thermal conductivity ntau dua thiab muaj peev xwm cia kub ntau dua li cov khoom pwm zoo tib yam. Cov khoom siv feem ntau suav nrog cam khwb cia hlau, tooj liab alloys, siab -purity graphite, thiab aluminium alloys. Ntawm cov no, cam khwb cia hlau chills yog tshwj xeeb tshaj yog nrov vim lawv cov kub cia coefficient thiab muaj zog chilling muaj peev xwm. Cam khwb cia hlau tuaj yeem nqus tau cov cua kub ntau sai, ua rau kom txias hauv zos sai dua thiab cov qauv zoo dua. Nws kuj yog ib qho yooj yim rau kev tsim khoom thiab kuj raug nqi - zoo.
Nyob rau hauv aluminium alloy thiab magnesium alloy precision castings, cam khwb cia hlau chills feem ntau muab tso rau hauv qab los yog qhov kawg ntawm cov pwm los tswj lub solidification sequence, yog li txhim kho qhov zoo thiab lub zog ntawm lub casting. Ntxiv nrog rau cam khwb cia hlau, aluminium chills kuj tau dav siv, tshwj xeeb tshaj yog nyob rau hauv lub teeb yuag casting systems. Lawv muab cov cua sov ua haujlwm zoo thaum txo qis cov tshuaj tiv thaiv nrog cov hlau molten, ua rau lawv haum rau cov tsis yog -ferrous hlau castings.
Graphite thiab tooj liab alloy chills yog siv rau kev siv tshwj xeeb ntau qhov chaw ua kom tiav thiab qhov loj me yog qhov tseem ceeb. Graphite, piv txwv li, muaj cov thermal poob siab zoo heev thiab tuaj yeem rov siv tau ntau zaus. Copper alloys, ntawm qhov tod tes, muaj cov thermal conductivity siab heev thiab yog qhov zoo tagnrho rau cov ntawv thov uas yuav tsum tau muab tshem tawm sai sai.
Hauv cov ntsiab lus, cov khoom siv chilling kom raug rau precision casting yuav tsum raug xaiv raws li hom hlau casting, pwm qauv, thiab cov yam ntxwv xav tau. Kev xaiv kom raug thiab qhov chaw txias txias tuaj yeem tswj tau qhov txias txias, txhim kho cov khoom siv kho tshuab, thiab xyuas kom muaj qhov tsis xws luag - dawb precision castings tsim nyog rau kev thov kev lag luam.
