1, Qhov laj thawj thiab qhov tshwm sim ntawm Pore teeb meem
Ib qho ntawm feem ntau tshwm sim ntawm qhov tsis zoo nyob rau hauv cov hlau 3D luam tawm qhov chaw, qhov pores zoo heev cuam tshuam rau cov yam ntxwv ntawm lub tshuab aerospace. Pores tsim nyob rau hauv ib qho nyuaj feem ntau cuam tshuam nrog raw cov ntaub ntawv thiab cov uas ua los ntawm laser kev ua si.
Cov ntaub ntawv nyoos feem ntau muaj qhov hws los ntawm cov pa phem hauv cov hmoov hlau thiab kev tiv thaiv ib puag ncig hauv tshuab. Hlau hmoov sai sai yaj thiab solidifies nyob rau hauv cov txheej txheem ntawm hlau 3D luam ntawv, thiab muaj zog variations nyob rau hauv lub melting pas dej ua ke yuav ua rau cov roj kom tsis txhob tag nrho cov khiav, yog li ua rau pores. Feem ntau spherical los yog elliptical nyob rau hauv daim ntawv, cov qhov no ho cuam tshuam rau cov neeg kho tshuab yam ntxwv ntawm cov khoom los ntawm qhov loj, kom muaj nuj nqis, zoo, thiab orientation.
Laser kev txiav txim qhov tsim pores yog intimately correlated nrog cov txheej txheem tsis. Yog hais tias lub zog input yog loj dhau los yog tsawg dhau thaum lub sij hawm laser sintering txheej txheem, pores tuaj yeem tshwm sim. Cov kua hlau txaws mus rau cov hmoov hlau uas tsis tau yaj thaum lub zog siab dhau, tsim cov txaws thiab qhov pores; Thaum lub zog tsawg dhau lawm, cov hmoov hlau tsis yog yaj tag, yog li ua rau tsis txaus interlayer bonding thiab tsim cov pores.
Lub neej qaug zog thiab lub zog tensile ntawm aerospace Cheebtsam tuaj yeem txo qis los ntawm qhov pores. Tshwj xeeb yog qhov chaw-txog qhov pores muaj feem cuam tshuam rau kev ua haujlwm qaug zog ntawm cov khoom tsim tawm. Tsis tas li ntawd cuam tshuam rau microstructure thiab mechanical qualities ntawm cov khoom tuaj yeem ua qhov pores, yog li cuam tshuam rau kev ua tau zoo ntawm cov khoom siv los ntawm cov khoom siv tsis sib xws.
2, Cov laj thawj tom qab thiab qhov tshwm sim ntawm cov teeb meem tawg
Lwm qhov tsis zoo nyob rau hauv cov txheej txheem hlau 3D luam ntawv yog cov kab nrib pleb, uas cuam tshuam qhov kev cia siab thiab kev nyab xeeb ntawm aerospace qhov chaw. Kev faib tawm ntawm qhov kub thiab txias, kev ntxhov siab, thiab tsis txaus fusion tag nrho muaj kev cuam tshuam ntawm kev tsim cov kab nrib pleb.
Qhov kub thiab txias qhov sib txawv ntawm lub pas dej molten thiab cov hlau solidified nyob rau hauv cov txheej txheem ntawm hlau 3D luam ntawv ua rau muaj kev cuam tshuam loj heev ntawm lub pas dej molten. Tab sis cov kua dej tsis muaj fluidity ua rau nws tsis tuaj yeem cuam tshuam qhov cuam tshuam los ntawm lub pas dej molten, yog li solidification fissures tsim. Tsis tas li ntawd txuas nrog cov liquefaction ntau, cov qauv nplej, thermal elongation, hlau shrinkage, thiab kaw, qee qhov chaw melting kuj tseem tuaj yeem pom cov pob txha liquefaction.
Lub zog thiab kav ntev ntawm cov khoom siv dav hlau tuaj yeem hloov pauv ntau los ntawm qhov muaj cov kab nrib pleb. Tshwj xeeb tshaj yog nyob rau hauv cyclic load, qhov twg cov kab nrib pleb kis tau thiab thaum kawg ua rau cov khoom tawg, cov kab nrib pleb yog ib qho ntawm cov ua rau qaug zog tsis ua hauj lwm. Tsis tas li ntawd cuam tshuam rau kev faib tawm kev ntxhov siab ntawm cov khoom yuav yog cov kab nrib pleb, uas ua rau muaj kev ntxhov siab ntau thiab ua rau lub cev qaug zog sai.
3, Lub tswv yim ntawm kev teb
Cov txheej txheem hauv qab no pab daws cov hlau 3D luam ntawv lub porosity thiab tawg teeb meem:
Maximizing txheej txheem tsis: Ib tug yuav ua tau zoo tswj cov khoom ntawm pores thiab kab nrib pleb los ntawm kev hloov cov txheej txheem tsis xws li laser zog, scanning ceev, thiab hmoov txheej thickness. Cov txheej txheem tsim nyog pab kom lav txaus melting thiab solidification ntawm hlau hmoov, yog li tiv thaiv kev loj hlob ntawm cov kab nrib pleb thiab pores.
Xaiv cov hmoov hlau zoo tshaj plaws kom txo cov porosity thiab impurities hauv cov khoom siv raw yuav pab txhim kho cov khoom zoo. Ua ntej-kev kho cov hmoov hlau-xws li ziab thiab sieving- kuj tseem tuaj yeem pab cov hmoov ua kom muaj dej ntau dua thiab sib npaug, yog li txo qis qhov tsim ntawm qhov pores.
Tom qab- txheej txheem kev kho mob: Cov pores thiab qhov loj ntawm cov kab nrib pleb tuaj yeem txo qis dua los ntawm kev tshaj tawm - cov txheej txheem kho nrog rau kev siv tshuab, kev kho cua sov, thiab polishing. Tshwj xeeb tshaj yog kub isostatic nias (HIP) kev kho mob tuaj yeem txo qis hauv qhov tsis zoo thiab txhim kho cov khoom ua haujlwm qaug zog.
Kev tswj hwm ntawm preheating thiab txias ceev rau substrate: Tsis tas li ntawd cuam tshuam cov ntsiab lus txhaum ntawm cov khoom kawg yog preheating lub substrate thoob plaws hauv cov txheej txheem luam ntawv thiab ua kom nws nyob rau ntawm qhov kub thiab txias raws li qhov tsim nyog txias pace. Los ntawm kev txo qis cov kab mob seem thiab yog li txo qhov kub thiab txias, preheating lub substrate tuaj yeem pab tiv thaiv qhov tshwm sim tawg.
https://www.china-3dprinting.com/metal-3d-printing/additive-manufacturing-racing-radiator.html