Txhais
Peev casting, tseem hu ua poob ciab casting los yog precision casting, yog ib tug precision casting txoj kev nrog tsawg thiab tsis txiav. Kev nqis peev molding cov ntaub ntawv (feem ntau yog cov ntaub ntawv uas tsis tshua muaj melting point xws li siv quav ciab) yog siv los ua cov peev txheej molding qauv thiab tsim cov qauv. Tom qab ntawd xim (cov khoom siv refractory) yog siv rau saum npoo ntawm lub module. Tom qab ziab thiab solidification, lub module yog rhuab kom yaj tawm cov khoom molding. Lub plhaub hollow yog tsim, thiab cov kua hlau yog poured rau hauv nws tom qab high-temperature sintering, thiab cov casting yog tau tom qab ntxuav.
Cov yam ntxwv ntawm peev casting
1.Castings muaj qhov siab qhov tseeb (CT4-CT7); Tsawg nto roughness (Ra1.6-6.3um). Kev txiav nyiaj ntawm castings raug txo, thiab ze-net-puab casting tuaj yeem ua tiav.
2. Muaj peev xwm ua tau nyias-walled castings nrog cov duab nyuaj. Xws li cov khoom siv pem hauv ntej (muaj cov nplhaib sab hauv thiab sab nrauv thiab 14 hniav). Piv txwv li, cav hniav muaj qhov tsawg kawg nkaus phab ntsa thickness ntawm 0.7 hli.
3.Alloy cov ntaub ntawv tsis txwv. Hlau, tooj liab, txhuas, titanium, magnesium, thiab lwm yam Nickel-based high-temperature alloys nrog cov ntsiab lus melting siab, qis melting point hlau xws li zinc thiab tin.
4.Kev nqis peev casting muaj qee yam kev txwv. Cov txheej txheem yog cumbersome, lub voj voog ntau lawm ntev, thiab qhov loj ntawm cov castings yuav tsum tsis txhob loj dhau.
Txheej txheem khiav
1. Tsim thiab tsim cov molding.
Cov pwm siv los ua cov qauv siv quav ciab hu ua stamper. Nws yuav tsum muaj qhov siab qhov tseeb thiab qhov chaw tiav. Nws yog ua los ntawm aluminium alloy, steel, fusible alloy, plaster los yog yas khoom raws li cov khoom batch.
2. Ua cov qauv siv quav ciab.
Cov khoom siv ntawm cov quav ciab pwm feem ntau yog ua los ntawm 50% paraffin thiab 50% stearic acid. Tom qab melting, siv wax xovxwm los nias lub paste wax khoom rau hauv pwm. Tom qab solidification, tshem tawm thiab muab tso rau hauv dej txias kom txias kom tsis txhob deformation. Lub sprue pwm feem ntau yog ua los ntawm ib tug ntoo pas nrig los yog txhuas pas nrig dipped nyob rau hauv ib tug 2-3 hli wax plhaub, thiab ces cov wax qauv yog welded rau lub sprue pwm nrog ib tug hluav taws xob cua sov riam los tsim ib tug module.
3.Shell ua.
Dip lub module rau hauv ib txheej ua los ntawm quartz hmoov thiab dej iav (los yog silica sol), tshem tawm, nphoo nws nrog quartz xuab zeb, thiab ces muab tso rau hauv ib tug hardener (feem ntau siv ammonium chloride los yog aluminium chloride) tov rau harden nws mus rau hauv ib tug txheej ntawm lub plhaub thiab rov ua cov hauj lwm saum toj no kom txog thaum lub plhaub thickness ntawm 5-10mm yog tsim.
4.Dewaxing thiab roasting.
Muab lub plhaub molded rau hauv lub tank dej kub ntawm 95-100 ℃ kom yaj cov pwm pwm thiab ntab tawm. Tom qab ntawd ci lub plhaub pwm ntawm 800-900 ℃ (dej iav pwm plhaub) kom muaj zog thiab tshem tawm cov pwm pwm. Moisture, residual ciab, saponification, thiab lwm yam.
5.Pouring thiab tu.
Lub plhaub raug rho tawm haujlwm feem ntau yog nchuav thaum nws kub tom qab raug tso tawm ntawm lub qhov cub kom thiaj li tsim tau nyias-walled castings. Tom qab lub casting txias lawm, rhuav tshem lub puab plhaub, tshem tawm cov casting thiab txiav tawm lub pouring thiab riser system, thiab tom qab ntawd ua tiav cov txheej txheem tom qab ua tiav, uas yog, siv sandblasting, tua blasting, alkali boiling thiab electrochemical tu txoj kev tshem tawm cov seem seem thiab nplaum rau ntawm qhov chaw thiab sab hauv kab noj hniav ntawm casting. Xuab zeb, chloride, thiab lwm yam yog muab tshem tawm kom tau txais castings nrog du nto.
