Muaj ntau ntau ntau yam tsis xws hauv cov khoom siv. Yog tias koj tsis paub txog lossis tsis nkag siab lawv ua ntej, nws yog qhov yooj yim yuav tsis meej pem tsuas yog los ntawm cov npe ntawm qee yam tsis xws luag. Piv txwv li, plaub yam tsis raug yog yuav los tham txog niaj hnub no: shrinkage thiab pores, txias kaw thiab wrinkles. Koj puas paub lawv yuav ua li cas thiab yog qhov sib txawv li cas? Cia peb saib lawv ua ke hnub no.
Cia saib ntawm shrinkage thiab pores ua ntej. Nws yuav yooj yim dua kom nkag siab nrog cov duab.
Shrinkage, uas peb kuj hu shrinkage porosity, yog tshwm sim los ntawm lub ntim deficit tshwm sim los ntawm lub ntim shrinkage ntawm cov txheej txheem thaum lub sij hawm solorification txheej txheem, thiab lub ntim deficately them nyiaj. Txij li cov solidification ntawm cov kua hlau feem ntau pib ntawm qhov chaw, shrinkage lossis shrinkage ntau tshwm sim nyob rau thaj chaw uas txias heev, feem ntau nyob hauv thaj chaw uas cov khoom siv tuab. Los ntawm cov tsos, ntawm ntug shrinkage lossis shrinkage yog feem ntau yog txiav txim los ntawm cov qauv kev loj hlob, feem ntau tsis xwm yeem. Raws li qhia nyob rau sab laug ntawm daim duab saum toj no.
Porosity feem ntau yog tshwm sim los ntawm kev muaj peev xwm ntawm cov roj hauv cov nrum uas tau tso tawm nyob rau lub sijhawm. Kev tsim ntawm cov roj av no muaj feem xyuam rau lub nqus tsev degree ntawm cov nplaum, kev siv cov nplaum thiab tso tawm cov dej khov kho, thiab cov dej khov ntawm cov dej ntws ntawm cov nplaim dej. Lawv feem ntau ua rau cov pa npuas zoo li sib sau ua ke, xws li nyob ze ntawm cov tub ntxhais, hauv qab ntawm lub pov, lossis nyob rau saum npoo ntawm lub casting. Los ntawm cov tsos, cov hws feem ntau yog spherical thiab du. Saib daim duab saum toj no rau kev sib piv nrog shrinkage kab noj hniav.
Tam sim no cia saib txias kaw thiab wrinkles. Cia peb muab ob daim duab rau kev sib piv.
Qhov tsis xws luag ntawm sab laug yog txias kaw, uas yog hais txog ib qho chaw saum npoo tsis tau tsim thaum ob ntws ntawm cov hlau sib tshuam tab sis tsis sib haum xeeb zoo. Nws feem ntau tshwm sim nyob rau hauv cov cheeb tsam nyob deb ntawm lub rooj vag. Nws lub ntsiab tseem ceeb yog pom tseeb, tsis xwm yeem, concave linear kab. Nws cov npoo ib txwm yog feem ntau du ntawm qhov kev sib tshuam, thiab tseem muaj qhov ua kom tawg. Qhov tsis xws luag no yog tshwm sim los ntawm kev tswj qhov kub tsis zoo, dhau mus qeeb ua nrawm nrawm, lossis cua hlob ntawm cov pwm uas cuam tshuam ntawm cov hlau.
Wrinkles, raws li lub npe qhia, muaj ntau wrinkles nyob rau saum npoo ntawm lub casting. Feem ntau, nws yog tshwm sim los ntawm high alloy kub thiab tsis tshua muaj qhov kub thiab txias. Nyob rau lub sijhawm no, lub alloy yuav rov qab los ntawm lub txias txias pem hauv ntej, ua rau wrinkles. Qee zaum, yog tias cov kua hlau ua ib qho khoom siv, me ntsis tawv oxide zaj duab xis nyob rau saum npoo, no wrinkle tseem yuav tshwm sim tom qab molding. Yog tias koj saib ntawm tawv tawv ua raws li kev magnification, nws feem ntau yog feem ntau ntxhib thiab ntxig.
Kuv ntseeg tias dhau los ntawm cov lus qhia saum toj no, koj muaj kev nkag siab zoo ntawm plaub yam tsis xws luag. Yog tias muaj lwm yam uas yooj yim rau kev ntxhov siab, thov tso cov lus hauv qab.(文章来源: Imchanics 机械)
