Mim, txoj kev tsim khoom uas sib xyaw cov yas txhaj tshuaj molding thiab hmoov metallurgy, tau txais cov txheej txheem tsoos thaum ua rau cov duab me me thiab cov khoom lag luam macroscopic. Los ntawm cov khoom xaiv thiab cov qauv tsim qauv rau post - kev ua yeeb yam, cov yam ntxwv ntawm cov mim ntu nta lawv qhov kev ua tau zoo thiab kev ua yeeb yam thiab daim ntawv thov kev ua tiav.
1. Precision Tswj cov khoom muaj pes tsawg leeg
Cov tub ntxhais ntawm cov mim cov txheej txheem dag nyob rau hauv lub system sib xyaw ntawm cov hlau thiab pinder. Spherical hlau hmoov nrog ib qho me me ntawm tsawg dua 20 microns (xws li 31} {{{{{}} 65% los ntawm ntim. Qhov zoo hmoov hmoov tawm kom paub meej tias cov sintered seem muaj cov ceev ceev, nrog ntsuas ntsuas qhov ua kom nce 95% -99% ntawm theoretical ntom. Cov phau ntawv khi yog feem ntau yog cov kab ke ua kom sib xyaw ua ke, uas ua tiav gradient decomposition thaum lub sijhawm debinding, tiv thaiv ib feem deformation. Nws yog tsim nyog sau tseg tias MIM cov ntaub ntawv muaj kwv yees li 15% -20% linerear shrinkage thaum sintering. No isotropic shrinkage yuav tsum tau ua kom haum pwm tsim los them nyiaj.
2. Muaj peev xwm ntawm cov qauv geometric
Piv rau cov tsoos machining yog qhov tseem ceeb rau nws muaj peev xwm los ua cov complex peb - qhov ntev cov qauv. Piv txwv li, tus impeller tivthaiv nyob rau hauv ib lub tsheb dav hlau nta 12 {Tuab tawg, txhua tus tsuas 0.3mm tuab, nrog kev ntws tawm ntawm ib txoj hauv kev mus txog RA 1.6μm. Cov qauv kev teeb tsa no tau tiav los ntawm kev txhaj tshuaj ntau npaum li 150Mpa thaum lub sijhawm txhaj tshuaj molding, ua kom cov khoom siv zoo kawg nkaus ntawm cov pwm kab noj hniav. Cov iav qhov chaw tso pom lwm qhov zoo dua: lawv tuaj yeem tsim cov hniav sib xyaw ua ke, ua tiav cov hniav profile raug mus txog ISO chav kawm 8 yam tsis tas yuav txhaj tshuaj ntxiv. Hauv cov tshuab txuas hluav taws xob, MIM tuaj yeem tsim cov qauv nyias nyias uas muaj 0.1 hli nyob rau hauv ib tus txheej txheem thaum tswj txoj kev zam lub sijhawm thaum ua kom tiav nrog cov thwj cim.
3. Isotropic Microstructure
Piv rau cov kev tso cai tso cai, cov kab ke ntawm cov pob zeb ua pov thawj cov khaub ncaws zoo nkauj equiaxed nplej. Noj rau Mim -} 304 stainless hlau raws li ib qho piv txwv, nws cov pa roj hmab sib tw me me ntawm Astm cov qib 8 txog 10, uas tsis muaj kev paub meej kev paub. Qhov no microstructure tau nyob rau hauv isotropic cov khoom siv tshuab, nrog lub tensile lub zog sib txawv ntawm tsawg dua 5% ntawm kev hloov pauv thiab ntev ntev. Los ntawm kev tswj cov sintering cua (xws li hydrogen lossis nqus tsev), tus qauv tuab nrog kev khav theeb qhib qis dua 0.5% tuaj yeem ua tiav. Hauv thaj chaw ntawm cov carbides cemented, Cobalt theem faib tawm cov kev sib faib wc yog 30% siab dua uas tau ua tiav los ntawm kev ua kom zoo dua kev hnav tsis kam. Txawm li cas los xij, nws yuav tsum tau sau tseg tias Sintering cov txheej txheem yuav tsim tau kaw qhov hws nrog ib lub cheeb ntawm 1-3μm. Cov cim xeeb me me no yuav tsum muaj kev ntsuas tshwj xeeb hauv qee cov ntaub ntawv siv Synamic.
4. Dual saum cov khoom
Cov npoo ntawm mim qhov chaw ua yeeb yam tshwj xeeb cov xeeb ceem: kev txhaj tshuaj dawb ua pov thawj lub ntsej muag ua kom tiav rau cov hmoov me me ntawm cov hmoov me me ntawm cov hmoov me me ntawm cov hmoov me me ntawm lub ntsej muag (RA 1.2μm). Cov yam ntxwv no ua rau muaj ntau cov ntaub ntawv sib txawv hauv cov khoom siv kho mob rau tib neeg los txhawb kev ua haujlwm biocompatibe, thaum kho tshuab mating ua tiav rau daim iav tiav. Nyob rau hauv lub chaw kho muag khoom, los ntawm kev ntxiv 0.5% -1% tsis tshua muaj ntiaj teb oxides (xws li y2o3), daim iav hauv paus nrog lub ntsej muag ua tiav ntawm RA 0.1μm tuaj yeem yog sintered.
5. Cov yam ntxwv me me ntawm precision tswj
The dimensional accuracy of MIM parts typically exhibits a three-tiered distribution: basic dimensions (>10 hli) raug tswj kom muaj kev zam rau ± 0.3%, nruab nrab (1-10 hli) ncav ± 0.1% thiab cov qauv zoo (<1mm) can achieve ±0.05%. This precision makes the MIM process significantly advantageous in the field of precision transmission. For example, in the production of watch escape wheels, a tooth pitch diameter of 2mm can maintain a repeatability of ±5μm. However, parts with large variations in wall thickness (such as 3mm walls coexisting with 0.5mm thin walls) are prone to sintering distortion, and reinforcing ribs are often required to balance shrinkage stresses.
6. Ua ke nta ntawm Post - kev ua haujlwm ntxiv
Txhawm rau ua raws cov kev ua haujlwm tshwj xeeb, mim ntu feem ntau siv kev sib xyaw ntawm post - kev txheej txheem. Nitriding tuaj yeem ua tiav qhov tawv tawv ntawm 1200 HV, nrog ib txheej tsis paub tob tob ntawm 20 {{8 μm; Txhaj Puamening tuaj yeem ua rau lub neej qaug zog los ntawm 3-5 zaug; thiab ntsag (kub isostatic nias) tuaj yeem tshem tawm kom meej rau sab hauv porosity. Rau qhov uas yuav tsum tau ua hauj lwm, el el el el elecel plating tuaj yeem ua tiav txheej txheej ntawm 5-10 μm, txo kev sib cuag ntawm ob lub zog ntawm. Qhov kev sib raug zoo ntawm cov txheej txheem tom qab ua ke nrog cov mim substrate nthuav tawm lawv cov peev xwm thov.
MIM Technology yog evolving rau multi -} Micrigle} Micrined Meting), thiab Muaj Peev Xwm 3D Luam Ntawv (Inline Saib Xyuas Zoo). Kev nce qib hauv kev sim xam cov tshuab tau qhib cov qauv kev twv ua ntej ntawm cov qauv mim, los ntawm hmoov xau loj rau kev ua tau zoo.