Hauvprecision peev casting, pwm plhaub permeability plays lub luag haujlwm tseem ceeb hauv kev txiav txim siab casting zoo. Tsim nyog permeability tso cai rau gases generated thaum lub sij hawm pouring thiab solidification kom dim, tiv thaiv tsis xws luag xws li roj porosity, blowholes, misruns, thiab nto blemishes. Tshwj xeeb tshaj yog rau silica sol peev casting, kom ntseeg tau tias lub plhaub zoo permeability yuav tsum tau ceev faj tswj nyob rau hauv tag nrho lub plhaub - ua thiab pouring txheej txheem.
Xaiv cov khoom siv plhaub
Lub hauv paus ntawmzoo pwm plhaubpermeability pib nrog kev xaiv cov ntaub ntawv refractory. Siab -zoo zircon xuab zeb, fused silica, los yog alumina-raws li xuab zeb nrog tswj particle loj faib yog feem ntau siv. Qhov sib npaug ntawm cov nplej yog qhov tseem ceeb: cov khoom zoo tshaj plaws tuaj yeem thaiv cov pa roj, thaum cov khoom ntxhib ntau dhau tuaj yeem ua rau lub plhaub tsis muaj zog. Nyob rau hauv kev xyaum, ib tug graded xuab zeb system feem ntau tau txais yuav kom ua tiav ob qho tib si lub zog txaus thiab cov pa roj kom zoo.
Lub binder system kuj cuam tshuam permeability. Silica sol binders tau siv dav vim lawv cov phooj ywg ib puag ncig thiab kev ruaj ntseg. Kev tswj xyuas qhov ruaj khov binder concentration pab kom tsis txhob muaj cov txheej txheem ntau dhau, uas tuaj yeem txo cov roj khiav tawm hauv lub plhaub qauv.
Tswj ntawm Plhaub Layer Structure
Tus naj npawb thiab thickness ntawm plhaub txheej muaj kev cuam tshuam ncaj qha rau permeability. Ob peb txheej yuav ua rau lub plhaub tsis txaus, thaum ntau txheej txheej tuaj yeem txo cov pa permeability. Feem ntau, qhov sib npaug tsim nyog tau ua tiav los ntawm kev siv lub ntsej muag lub ntsej muag kom zoo rau saum npoo thiab me ntsis coarser thaub qab txheej los txhim kho qhov cua.
Uniform txheej thaum dipping thiab stuccoing yog qhov tseem ceeb sib npaug. Lub plhaub tuab tsis sib xws tuaj yeem ua rau cov pa hauv cheeb tsam sib sau ua ke, ua rau muaj kev pheej hmoo ntawm sab hauv porosity thaum lub sij hawm hlau nchuav.
Qhuav thiab Curing Conditions
Kev ziab kom zoo thiab kho kom zoo yog qhov tseem ceeb rau kev tsim cov pores sib txuas hauv lub plhaub. Kev ziab tsis txaus tuaj yeem cuam tshuam cov dej noo hauv lub plhaub, ua rau lub zog tsim hluav taws xob thiab roj siab thaum lub sij hawm nchuav. Ntawm qhov tod tes, kev ziab sai heev tuaj yeem ua rau lub plhaub tawg.
Tswj qhov kub thiab txias, av noo, thiab airflow thaum lub sij hawm ziab pab kom muaj qhov pore zoo ib yam. Lub sij hawm kho kom zoo tso cai rau cov ntawv khi kom tag nrho cov ntaub ntawv refractory thaum tuav cov porosity sab hauv.
Siv quav ciab tshem tawm thiab plhaub tua hluav taws
Kev siv cov dewaxing zoo yog qhov tseem ceeb los tswj cov pa roj ntshiab. Kev tshem tawm tsis tiav tuaj yeem thaiv qhov pores thiab txo cov permeability. Autoclave dewaxing los yog tswj kev tua hluav taws yog feem ntau siv los xyuas kom huv si tshem tawm cov quav ciab.
Tom qab dewaxing, plhaub firing ntxiv txhim kho permeability los ntawm kev tshem tawm cov organic residual thiab ntxiv dag zog rau cov qauv ceramic. Kev tua hluav taws kom zoo thiab lub sijhawm ua kom lub plhaub ruaj khov thaum khaws cia nws cov ntxiab network.
Pouring Design thiab Venting Considerations
Txawm hais tias muaj ib lub qhov dej - npaj lub plhaub, kev tsim cov dej tsis zoo tuaj yeem cuam tshuam kev tso pa tawm. Tsim nyog rooj vag thiab riser tsim kom zoo hlau ntws thiab txo turbulence, minimizing gas entrapment. Qee qhov xwm txheej, cov qhov tso pa tawm tuaj yeem ntxiv los pab tshem tawm cov pa tawm ntawm cov kab noj hniav nyuaj.
Xaus
Xyuas kom pwm plhaub permeability thaum lub sij hawm casting yog ib tug txheej txheem uas muaj xws li kev xaiv cov khoom, plhaub qauv tswj, ziab kom qhuav, dewaxing, firing, thiab pouring tsim. Los ntawm kev tswj hwm qhov sib npaug ntawm lub plhaub lub zog thiab cov pa permeability, cov chaw tsim khoom tuaj yeem txo qhov tsis xws luag thiab ua tiav cov txiaj ntsig zoo, siab -. Rau precision peev casting manufacturers, kev tswj nruj ntawm cov yam tseem ceeb no yog qhov tseem ceeb kom tau raws li qhov kev xav tau ntawm cov neeg siv khoom thoob ntiaj teb.
