Kev ntsuas kom tshem tawm cov tawv nqaij tsis xws luag
Xaiv cov yas ua npuas ncauj haum raucasting: Muaj ob txoj hauv kev los txo cov khoom ua kua ntawm polystyrene: ua ntej, txhim kho vaporisation ntawm cov khoom siv molding (xws li nce lub ncuav nrawm thiab kub, txhim kho permeability ntawm pwm, thiab lwm yam) los txhawb nws cov vaporisation tag nrho; Thib ob, xaiv tsawg- ntom ntom ua npuas ncauj yas raws li cov khoom siv molding raws li hom casting alloy, zoo li casting, thiab cov yam ntxwv ntawm cov xuab zeb, kom ntseeg tau tias tsawg tsawg, cov pa luam yeeb tsawg, thiab vaporisation sai ntawm cov npuas yas. Qhov no kuj tseem pab txo qis kev tsim cov tar-zoo li cov kua seem thiab cov khoom ua kua- theem decomposition khoom thaum cov npuas yas los rau hauv kev sib cuag nrog cov hlau molten, yog li txhim kho qhov zoo ntawm cov casting.
Ua kom qhov kub thiab txias ntxiv: Tsim nyog xaiv qhov kub thiab txias ua lub luag haujlwm tseem ceeb hauv kev tswj qhov tsis xws luag. Pouring ntawm qhov qis qis nyob rau hauv siab - qhov kub thiab txias ua kom yooj yim rau sab saum toj -down solidification ntawm casting, ua rau qhov kub thiab txias sib txawv ntawm kab rov tav interfaces thiab ua raws li lub hauv paus ntsiab lus ntawm sequential solidification. Thaum siv cov kauj ruam los yog slit pouring system, kom ua tiav cov kev sib txuas ua ke, cov dej ntws sab hauv yuav tsum tau qhia los ntawm nyias - cov phab ntsa ntawm cov casting, thaum nce tus naj npawb ntawm cov dej ntws sab hauv. Kev siv qhov qis- qhov kub thiab txias ceev cov txheej txheem txo cov kua hlau shrinkage thiab tiv thaiv kev tsim ntawm shrinkage kab noj hniav thiab porosity. Ua kom qhov kub ntawm cov cam khwb cia hlau los ntawm 20℃mus rau 80℃thiab ua kom nrawm nrawm nrawm thaum ua kom cov hlau ntws zoo tuaj yeem them nyiaj rau cov cua sov los ntawm cov yas combustion, vaporisation, thiab cov kua dej ntws hauv pwm, muab cov cua sov txaus los xyuas kom meej cov yas vaporisation. Qhov no txhim kho cov npuas yas vaporisation tej yam kev mob, ua kom yooj yim cov hlau ntim ntawm pwm, thiab txhawb kev khiav tawm ntawm cov seem thiab cov pa roj.
Xaiv txoj hauj lwm pouring tsim nyog: Raws li cov yam ntxwv ntawm cov yas pwm combustion thiab gasification nyob rau hauv lub pwm, lub pouring txoj hauj lwm rau cov khoom castings yuav tsum zoo dua siv lub hauv qab pouring txoj kev tsis hais hom alloy. Txawm li cas los xij, rau qee qhov cam khwb cia hlau, nyob rau hauv cov xwm txheej tsim nyog xws li cov qauv tsim nyog thiab cov txheej txheem txheej txheej, nrog rau cov pwm zoo permeability, lwm txoj haujlwm nchuav kuj raug xaiv. Txawm li cas los xij, nws yog ib qho tseem ceeb los xyuas kom meej meej thiab nrawm ntawm cov pwm nrog molten hlau. Thaum teem lub pouring txoj hauj lwm, cov duab ntawm lub casting yuav tsum tau tag nrho xav txog. Rau qhov loj - cheeb tsam lossis siab castings, nws yog ib qho tsim nyog yuav tsum tau txais ib qho kev sib cais, ntau- theem, txheej txheej txheej txheej kom tsis txhob muaj ntau dhau ntawm cov dej ntws. Qhov no ua kom yooj yim dua thiab nrawm nrawm ntawm cov pwm nrog cov hlau molten, yog li txhim kho cov khoom zoo.
Tsim nyog tsim ntawm risers: Yog hais tias tus naj npawb, txoj hauj lwm, thiab qhov loj ntawm risers tsis tsim tsim nyog, lawv yuav ua tsis tiav los txhawb kev sib txuas ntawm cov casting, yog li ua tsis tau tshem tawm cov kab noj hniav thiab cov porosity. Thaum lub sab saum toj ntawm lub zais riser tsis tau nruab nrog lub qhov cua riser, gases yuav ua rau shrinkage kab noj hniav thiab porosity nyob rau hauv lub casting. Cov hlau txias yog feem ntau siv hauv kev tsim qauv, thiab lawv qhov chaw kuj tseem ceeb heev. Qhov chaw tsis raug tuaj yeem cuam tshuam kev sib koom ua ke thiab ua rau cov kab noj hniav shrinkage thiab porosity hauv cheeb tsam.
Txhim kho qhov permeability ntawm cov pwm: Ib qho pwm uas muaj qhov zoo permeability yog qhov tsim nyog rau kev ua kom muaj kev tsim cov khoom zoo ntawm - zoo castings. Kev xyaum tau pom tias muaj peb txoj hauv kev los txhim kho qhov permeability ntawm pwm: txhim kho permeability ntawm cov xuab zeb moulding, ua kom muaj pes tsawg lub qhov cua los yog qhov cua risers, thiab teeb tsa ntau qhov cua sab nraud hauv pwm raws li cov qauv ntawm cov qauv. Vim yog cov pwm zoo permeability, txaus qhov sib txawv ntawm cov hlau molten thiab cov yas ua npuas ncauj thaum lub sij hawm pouring, yog li txhim kho cov gasification tej yam kev mob thiab tus nqi ntawm cov npuas yas pwm, ua kom yooj yim rau khiav los yog nkag mus rau nws siab - kub decomposition khoom rau hauv pwm xuab zeb.
Kev txhim kho txheej txheej ntawm cov yas ua npuas ncauj: Txau ib txheej ntawm nitrocellulose los yog lwm cov txheej txheej uas vaporise sai dua li cov yas rau saum npoo ntawm cov npuas yas pwm tsis tsuas yog txhim kho qhov zoo ntawm tus qauv tab sis kuj pab rau vaporisation ntawm cov npuas yas thiab tiv thaiv kev tsim ntawm siab - kub decomposition khoom. Txhim kho qhov ntws ntawm cov hlau molten yog qhov zoo rau kev txhim kho qhov zoo ntawm cov casting thiab tshem tawm qhov tsis xws luag.
Xaiv cov txheej txheem tsim nyog thiab qauv qauv: Rau qhov loj, tuab - cov qauv phab ntsa, cov qauv hollow thiab sab hauv / sab nraud qhov cua hauv cov qauv los yog pwm tuaj yeem siv los txhim kho cov xwm txheej gasification ntawm cov pwm yas pwm. Ib txoj kev molding serial kuj tuaj yeem raug coj los ua kom pom qhov tsis xws luag nyob rau sab saum toj ntawm ib qho casting, kom ntseeg tau qhov zoo ntawm qhov seem castings.
Nyob rau hauv cov ntsiab lus, cov yam uas ua rau wrinkling tsis xws luag nyob rau hauv cam khwb cia hlau qhov chaw yog multifaceted thiab tsis tuaj yeem daws tau los ntawm tsuas yog hloov ib qho khoom lossis txheej txheem. Hloov chaw, nws yog ib qho tseem ceeb kom nkag siab txog qhov cuam tshuam ntawm tag nrho cov lus hais saum toj no, txhim kho cov txheej txheem zoo, thiab xyuas kom cov khoom siv hlau cam khwb cia tsis muaj qhov tsis xws luag.
