Nyob rau hauv ib txwm muaj xwm txheej, qhov tseeb qhov tseeb ntawm precision castings raug cuam tshuam los ntawm ntau yam xws li cov qauv casting, cov khoom siv casting, pwm ua, plhaub ua, ci, pouring, thiab lwm yam. Txhua qhov chaw lossis kev ua haujlwm tsis tsim nyog ntawm txhua qhov txuas yuav hloov pauv tus nqi shrinkage. casting.Qhov no ua rau kev sib txawv ntawm qhov tseeb qhov tseeb ntawm cov castings los ntawm cov kev xav tau.Cov hauv qab no yog cov yam ntxwv uas tuaj yeem ua rau muaj qhov tsis xws ntawm qhov raug ntawm precision castings:
(1) Kev cuam tshuam ntawm cov qauv casting: a.Casting phab ntsa thickness, loj shrinkage tus nqi, nyias casting phab ntsa, me me shrinkage tus nqi.b.Qhov dawb shrinkage tus nqi yog loj, thiab tus nqi hindered shrinkage yog me me.
(2) Kev cuam tshuam ntawm cov khoom siv casting: a.Qhov siab dua cov ntsiab lus carbon nyob rau hauv cov khoom, qhov me me ntawm linear shrinkage tus nqi, thiab qis cov ntsiab lus carbon, qhov ntau dua linear shrinkage tus nqi.b.Lub casting shrinkage tus nqi ntawm cov ntaub ntawv ntau yog raws li nram no: casting shrinkage tus nqi K = (LM-LJ) / LJ × 100%, LM yog kab noj hniav loj, thiab LJ yog qhov loj casting.K yog cuam tshuam los ntawm cov hauv qab no: ciab pwm K1, casting qauv K2, alloy hom K3, pouring kub K4.
(3) Kev cuam tshuam ntawm pwm ua rau ntawm cov kab shrinkage tus nqi ntawm castings: a.Qhov cuam tshuam ntawm kev txhaj tshuaj wax kub, wax txhaj tshuaj siab, thiab lub sijhawm tuav lub sijhawm ntawm kev nqis peev loj yog qhov pom tseeb tshaj plaws hauv kev txhaj tshuaj wax kub, ua raws li kev txhaj tshuaj siv quav ciab, thiab lub sijhawm tuav lub sijhawm yog guaranteed Tom qab kev nqis peev tsim, nws muaj me ntsis cuam tshuam rau qhov loj kawg ntawm kev nqis peev.b.Lub linear shrinkage tus nqi ntawm wax (pwm) cov ntaub ntawv yog hais txog 0.9-1.1%.c.Thaum lub peev pwm khaws cia, yuav muaj qhov shrinkage ntxiv, thiab nws cov nqi shrinkage yog kwv yees li 10% ntawm tag nrho cov shrinkage, tab sis thaum khaws cia rau 12 teev, cov peev pwm loj yog qhov ruaj khov.d.Qhov radial shrinkage tus nqi ntawm cov quav ciab pwm tsuas yog 30-40% ntawm qhov ntev shrinkage tus nqi.Qhov kev txhaj tshuaj wax muaj qhov cuam tshuam ntau dua ntawm qhov tsis muaj qhov shrinkage ntau dua li qhov cuam tshuam ntawm qhov shrinkage (qhov zoo tshaj plaws wax txhaj tshuaj kub yog 57-59 ℃, qhov kub thiab txias dua, qhov ntau dua qhov shrinkage).
(4) Kev cuam tshuam ntawm cov khoom siv plhaub: zircon xuab zeb, zircon hmoov, Shangdian xuab zeb thiab Shangdian hmoov yog siv.Vim lawv cov coefficient me me, tsuas yog 4.6 × 10-6 / ℃, lawv tuaj yeem tsis quav ntsej.
(5) Cov nyhuv ntawm lub plhaub ci: Vim tias qhov nthuav dav coefficient ntawm lub plhaub me me, thaum qhov kub ntawm lub plhaub yog 1150 ℃, nws tsuas yog 0.053%, yog li nws tuaj yeem tsis quav ntsej.
(6) Kev cuam tshuam ntawm qhov kub thiab txias: qhov siab dua qhov kub ntawm qhov casting, qhov ntau dua qhov shrinkage tus nqi, thiab qhov qis ntawm qhov casting kub, qhov me me qhov shrinkage tus nqi, yog li qhov kub ntawm casting yuav tsum tsim nyog.
Post lub sij hawm: Nov-15-2021