Dab tsi yog qee qhov tsis xws luag hauv Hlau Txhaj Moulding?
MIM cov teeb meem tshwm sim ntawm txhua theem tsim khoom. Qhov kev ntxhov siab yog tias cov hauv paus ua rau feem ntau zaum ob lossis peb kauj ruam ua ntej tshaj qhov pom qhov tsis xws luag.
Khoom noj khoom haus thiab txhaj tshuaj
Binder{0}} sib cais hmoov ntawm rooj vag.Siab shear ntawm lub rooj vag ua rau cov binder txav mus ua ntej ntawm cov hmoov av. Koj xaus nrog ib daim ntawv khij - thaj chaw nplua nuj nyob ze ntawm lub rooj vag, hmoov - thaj chaw nplua nuj nyob hauv qab. Nto tiav zoo li txawv ntawm thaj tsam, thiab cov khoom siv kho tshuab ua raws. Ib tug hlau txhaj tshuaj molding tsum khiav tib feedstock los ntawm txawv qhov rooj geometries yuav pom txawv txawv qauv. Cov rooj vag loj dua txo qis tab sis lub sij hawm qeeb qeeb - kev lag luam - tawm yog nyob ntawm phab ntsa thickness thiab ntws ntev.
Kev txhaj tshuaj luv luv.Feedstock viscosity siab dhau lawm, pwm kub tsis dhau, txhaj tshuaj tsis txaus, los yog venting thaiv. Nyias- ntu phab ntsa ua kom ruaj khov ua ntej cov khoom noj mus txog qhov kawg ntawm kab noj hniav. Peb muaj 0.8 hli phab ntsa kho mob txuas xyoo tas los uas ua rau luv luv ntawm ib lub ces kaum kom txog rau thaum peb tsoo pwm kub ntawm 38℃mus rau 46 degree. daws nws, tab sis lub voj voog lub sij hawm nce 4 vib nas this.
Flash.Clamping quab yuam tsawg los yog parting kab hnav. MIM feedstock yog viscous ntau dua li cov thermoplastics, yog li flash tends thinner. Nyias nyem tawg tawm thaum tuav thiab kis mus rau lwm qhov hauv lub tais. Txhaj tshuaj molding zoo tswj lub sijhawm yuav tsum tau khiav nruj dua li cov txheej txheem yas txheej txheem -peb tshawb xyuas cov kab sib faib txhua 8,000 txhaj tshuaj es tsis yog 20,000.
Vim li cas cov khoom tawg thaum lub sij hawm Debinding?
Debinding ua rau cov khoom seem ntau dua li kev txhaj tshuaj rau feem ntau cov haujlwm. Qhov tsis xws ntawm no zoo li cov teeb meem txhaj tshuaj, uas xa cov teeb meem hauv qhov tsis ncaj ncees lawm.
Solvent debinding hlwv
Cov kuab tshuaj tshem tawm cov ntaub ntawv tseem ceeb thiab tawm cov porosity sib cuam tshuam. Tus qauv pib yog 59% tshem tawm kom tau txais cov kev sib txuas. Cov tuab tuab xav tau ntau dua-peb lub hom phiaj 82-88% ntawm txhua yam tshaj li 5 hli phab ntsa ua ntej txav mus rau qhov cua sov, txwv tsis pub cov pa roj decomposition ua rau blistering.
Qhov tsis yooj yim: tom qab da dej hnyav, cov pob txha pob txha polymer softens me ntsis thiab capillary rog rub nws rov qab rau hauv qhov hws, rov- cov kab sib khi uas qhib. Cov khoom uas zoo li tawm ntawm cov kuab tshuaj tseem tuaj yeem ua hlwv hauv qhov cub.
Peb muaj 6.2 hli tuab cov cuab yeej phais uas ua kom blistering txawm tias ntawm 68% hnyav tshem tawm. Thawb nws mus rau 87% thiab qhov teeb meem ploj mus. Tam sim no qhov ntawd yog peb qhov pib pib rau cov ntu hnyav.
Thermal debinding distortion
Dab tsi mus yuam kev hauv Sintering rauv?
Qhov ntom thiab porosity.MIM lub hom phiaj 96-99% theoretical ntom nyob ntawm alloy. Undersintering tawm qhov pores loj; oversintering ua rau grain loj hlob. Kev tswj kub yuav tsum nyob hauv ± 5℃kom tau txais txiaj ntsig zoo ib yam, txawm hais tias ntawm qee cov cuab yeej steel peb tau pom lub qhov rais tiag tiag ze rau ± 3 degree. Rauv qhov chaw kub kub drift- tsis tu ncua kev soj ntsuam ceev ntawm cov pov thawj daim coupon ntes teeb meem ua ntej lawv mus txog shipping.
Warping thiab slumping.MIM shrinks 15-20% linearly thaum sintering. Peb ntsuas 17.8–19.2% ntawm 316L lub quarter dhau los hla ntau qhov sib txawv geometry. Tsis yog-cov khaub ncaws shrinkage ua rau warping: ceev variation nyob rau hauv ntsuab ib feem, kub gradient nyob rau hauv cub tawg, lub ntiajteb txawj nqus ntawm unsupported seem. Rau precision txhaj molding cov kev pab cuam ntawm nruj- qhov kam rau ua, kev cai setter tsim tsis yog xaiv tau. Peb tam sim no spec tshwj xeeb setters rau txhua qhov project tshiab- raug nqi ntau dua, tab sis tuav qhov loj me rau ± 0.25% es tsis txhob ± 0.6%.
Ua kua-theem sintering alloys yog rhiab dua. Ob peb degrees tshaj li kua thiab qhov seem slumps. Ob peb degrees hauv qab thiab koj tsis nco lub hom phiaj.
Carbon tswj hauv steels.Cov pa roj carbon monoxide los ntawm cov hmoov qub, cov khoom seem uas tsis muaj qhov kub hnyiab tawm, thiab cov cua sov hauv qhov cub . 316L stainless saum 0.03% carbon qhia tau tias txo cov corrosion kuj- peb tau sim qhov no ntawm 0.028% vs 0.041% thiab cov ntsev tsuag sib txawv yog pom tseeb. Atmosphere dewpoint thaum lub sij hawm thermal debinding cuam tshuam cov pa roj carbon. Feem ntau ntawm MIM cov chaw tsim khoom lag luam khiav lub voj voog huab cua rau cov pa roj carbon- cov qib rhiab heev.
Ntsiab Sintering Factors
- Kev Tswj Ceev
- Shrinkage Management (15-20%)
- Kev tswj huab cua
"Kev kuaj xyuas tsis tu ncua ntawm cov pov thawj daim coupon ntes teeb meem ua ntej lawv mus txog kev xa khoom."
Cov Lus Nug Regrind
Regrind txuag nyiaj tab sis qhia qhov sib txawv. Tom qab 6 mus rau yim dhau los ntawm lub thoob, binder degrades, particle loj faib hloov ntawm pob txha, cov kab mob sib kis. Surface defect tus nqi nce. Peb txwv regrind rau 25-30% ntawm cov khoom noj tshiab ntawm txhua yam mus rau tsheb lossis kho mob. Cov feem pua siab dua ua haujlwm rau cov khoom lag luam uas cov tshuaj pleev ib ce tseem ceeb tsawg dua.
Hla -kev sib kis ntawm cov alloys yog ruaj khov. Ib tug tungsten particle nyob rau hauv ib tug stainless batch qhia tau hais tias raws li ib tug nyuaj chaw nyob rau hauv lub tiav ib feem. Kev cai txhaj tshuaj molding kev daws teeb meem rau kev sib xyaw ua ke -alloy ntau lawm xav tau lub thoob thiab cov ntsia hlau teeb rau ib tsev neeg alloy- kim, tab sis tshem tawm hom tsis ua hauj lwm tag nrho.
Yog tias koj tab tom nrhiav MIM qhov tsis xws luag uas yuav tsis kho, qhov teeb meem feem ntau tsis yog qhov koj tab tom nrhiav. Xa koj daim duab kos rau peb thiab cov duab ntawm qhov tsis xws luag -peb yuav ua tus txheej txheem - theem kev tshuaj ntsuam thiab qhia koj qhov twg yuav pib. Tsis tau them nqi rau kev tshuaj xyuas thawj zaug.