Kev ntsuas los tiv thaiv nres disc shrinkage thiab looseness: cov hlau molten yog nkag mus rau hauv lub sprue tusyees kom txo tau lub zos overheating ntawm lub disc thiab tiv thaiv kev tsim ntawm cov khoom cua kub. Raws li kev pom ntawm kev sib npaug ntawm cov hlau castings, qhov ntau nyias-walled me me, qhov ntau dua tus nqi shrinkage, thiab qhov tseem ceeb ntawm shrinkage. Pub hom tuaj yeem yog gating system noj lossis riser pub. Thaum lub tswv yim pub noj ntawm qhov rooj kaw lus tau txais yuav, lub taub hau sprue tuaj yeem tsim nyog, xws li nce qhov siab ntawm lub thawv sab saud, ntxiv lub nplhaib rooj vag, thiab lwm yam; Tus ntoo khaub lig khiav yog qhov tseem ceeb ntawm skimming thiab ntab huab cua. Thaum nws yog siv rau shrinkage ntxiv, nws seem loj tuaj yeem nce qhov tsim nyog; Internal sprue yuav tsum luv, nyias thiab dav. Internal sprue yog luv (lub transverse sprue yog ze rau lub casting). Vim lub thermal cuam tshuam ntawm casting thiab transverse sprue thiab cov nyhuv ntws ntawm molten hlau filling thiab pub mis, lub sab hauv sprue yuav tsis tau solidified thiab kaw ua ntej, thiab nws yuav nyob twj ywm unblocked rau lub sij hawm ntev. Nyias (feem ntau) tuaj yeem tiv thaiv qhov tsim ntawm kev sib cuag kub pob qij txha ntawm qhov nkag ntawm sab hauv sprue. Qhov dav yog los xyuas kom meej txaus cheeb tsam overflow. Thaum lub casting nkag mus rau qhov sib npaug ntawm qhov sib npaug ntawm cov graphitization expansion thiab contraction, cov hlau molten nyob rau hauv lub ingate yuav tsum tsis txhob ntws thiab yuav solidify thiab nres nyob rau hauv lub sij hawm los txhim kho tus nqi ntawm graphitization nws tus kheej noj, uas yog lub adaptive hloov ntawm luv luv, nyias. thiab dav ingate (riser caj dab) ntawm kev pub mis. Rau ib co castings nrog loj shrinkage, ib tug riser yuav teem rau pub. Lub riser yog qhov zoo tshaj plaws teem rau thaum pib ntawm lub puab sprue, los yog ib tug riser yuav tsum tau teem nyob rau hauv nruab nrab core pub lub disc ntawm ib sab ntawm lub puab sprue. Rau cov me me nyias-walled qhov chaw, cov kev ntsuas thib ob tuaj yeem siv tau, uas yog, inoculant tuaj yeem muab ntxiv rau hauv cov pob me me rau kev siv tshuaj tiv thaiv tam sim los txhim kho cov nyhuv inoculation thiab txhawb cov nucleation thiab kev loj hlob ntawm graphite. Nws tuaj yeem muab ntxiv rau hauv qab ntawm lub pob thiab ntxuav rau hauv cov hlau molten.
