Summary of New Powder Metallurgical Forming Technologies in China in the last decade

Summary of New Powder Metallurgical Forming Technologies in China in the last decade

Hmoov metallurgyyog ib qho kev tsim technology siab heev uas ua ke nrog kev npaj cov khoom siv thiab kev tsim ib feem, txuag hluav taws xob, txuag cov khoom siv, kev ua haujlwm siab, kev sib sau zaum kawg, thiab muaj kuab paug tsawg. Nws muaj txoj haujlwm tsis tuaj yeem hloov pauv thiab lub luag haujlwm hauv cov khoom siv thiab kev tsim khoom lag luam, thiab tau nkag mus rau hauv lub hauv ntej ntawm cov khoom siv niaj hnub no.

Tam sim no, hmoov metallurgy thev naus laus zis tab tom txhim kho mus rau qhov siab ceev, kev ua haujlwm siab, thiab tus nqi qis. Tsab ntawv xov xwm no tsom mus rau kev nthuav qhia ntau yam tshiab tsim thev naus laus zis rau cov hmoov hlau metallurgy hauv kaum xyoo dhau los.

1, Cov txheej txheem sov compaction

Sov lub comaction technology yog cov thev naus laus zis tshiab tsim hauv cov hmoov metallurgy nyob rau hauv tsis ntev los no, uas tuaj yeem tsim lub zog ntev heev, thiab muaj qhov kev thov loj. Lub npe hu ua sov compaction technology yog ib lub tshuab uas siv cov hmoov tshwj xeeb cua sov, hmoov conveying, thiab pwm cua sov system kom sov pre alloy hmoov thiab pwm nrog tshwj xeeb lubricants rau 130 mus rau 150 degree, thiab tswj qhov kub thiab txias nyob rau hauv ± 2.5 degree. Tom qab ntawd, zoo li cov txheej txheem hmoov metallurgy, hmoov metallurgy qhov chaw yog tsim los ntawm kev nias thiab sintering. Cov yuam sij kev yog: thawj zaug, sov compaction hmoov npaj, thiab thib ob, sov compaction system.

Piv nrog rau cov txheej txheem ib txwm muaj, qhov ceev ntawm qhov sov so compaction compaction muaj qhov nce ntawm {{0}}.15 mus rau 0.30g / cm3, thiab nws qhov ceev tuaj yeem ncav cuag 7.45g / cm3. Nyob rau hauv tib lub zog nias, lub zog tawm los ntawm cov ntaub ntawv sov sov yog nyob rau nruab nrab 11 feem pua ​​​​siab dua li cov txheej txheem ib txwm muaj, qhov kawg tensile lub zog yog nyob rau nruab nrab 13.5 feem pua ​​​​siab dua, thiab qhov cuam tshuam toughness tuaj yeem txhim kho los ntawm 33 feem pua. Tsis tas li ntawd, lub zog ntsuab ntawm qhov chaw sov so yog siab, mus txog 2O ~ 30MPa, uas yog 50 ~ 100 feem pua ​​​​siab dua li cov txheej txheem ib txwm muaj. Qhov no tsis tsuas yog txo qhov kev puas tsuaj thaum lub sij hawm tuav ntsuab, tab sis kuj ua rau machining ntawm ntsuab, nrog ib tug zoo nto tiav. Tsis tas li ntawd, cov txheej txheem sov so muaj qhov tsis tshua muaj siab thiab me me demoulding quab yuam, thaum qhov kev ua tau zoo ntawm cov khoom tsis sib xws, cov khoom raug yog siab, thiab cov khoom siv yog siab.

Cov txheej txheem sov compaction kuj yog tus yam ntxwv ntawm nws txoj kev yooj yim thiab tus nqi qis. Cov kev tshawb fawb qhia tau hais tias yog tus nqi ntawm cov txheej txheem hmoov metallurgy ntawm ib zaug nias thiab sintering yog 1.0, tus nqi txheeb ze ntawm hmoov forging yog 2.0, tus nqi txheeb ze ntawm kev nias dua thiab re sintering yog 1.5, tus nqi txheeb ze ntawm tooj liab infiltration yog 1.4, thiab tus txheeb ze tus nqi ntawm sov compaction technology yog 1.25. Tam sim no, muaj ntau tshaj 200 hom hmoov metallurgy qhov chaw tsim los ntawm kev siv tshuab sov so, nrog qhov hnyav ntawm 5-1200g. Piv txwv li, Sinterstahl GmbH ntawm lub teb chaws Yelemees siv sov compaction technology los tsim complex synchronous iav rings rau kev sib txhuam sib kis, thiab yeej qhov khoom plig ntawm PM2TEC2001 International Conference nyob rau hauv New Orleans, USA. Tus hniav ceev ntawm ib feem ntau tshaj li 7.3 g / cm, lub nplhaib density tshaj li 7.1 g / cm, thiab lub zog ntsuab nce mus txog 28 mpa. Diffusion alloying sintered nyuaj pressed hmoov yog siv, nrog rau qhov tsawg kawg nkaus tensile zog ntawm 850 MPa. Vim yog siv cov tshuab ua kom sov thiab siv cov hmoov metallurgy qhov chaw, tag nrho cov nqi tau txo los ntawm 38 feem pua.

2, Flow sov compaction technology

Warm Flow Compaction (WFC) yog ib qho tshiab ze-net tsim tshuab rau cov hmoov metallurgy Cheebtsam, uas yog raws li cov hmoov compaction thiab sov compaction molding txheej txheem thiab muab cov zoo ntawm hlau hmoov txhaj molding. Cov thev naus laus zis tseem ceeb yog txhawm rau txhim kho fluidity ntawm cov hmoov sib xyaw. Los ntawm kev txhim kho lub fluidity, sau muaj peev xwm, thiab formability ntawm cov hmoov sib tov, nws muaj peev xwm ua tau raws li qhov chaw nrog cov duab geometric complex, xws li cov grooves, qhov, thiab threaded qhov perpendicular mus rau lub pressing kev taw qhia, ntawm ib txwm xovxwm ntawm kub. xws li ntawm 8O mus rau 130C, tsis tas yuav tsum tau tom qab machining theem. WFC thev naus laus zis tsis yog tsuas yog kov yeej qhov tsis txaus ntawm cov hmoov hlau metallurgy hauv kev tsim cov duab geometric nyuaj, tab sis kuj zam cov nqi siab ntawm cov hlau txhaj tshuaj molding tshuab. Nws yog ib qho kev cog lus tshiab thev naus laus zis nrog kev siv dav dav heev.

WFC thev naus laus zis, raws li lub tshuab tshiab ze-net tsim tshuab rau hmoov metallurgy qhov chaw, muaj cov yam ntxwv tseem ceeb hauv qab no: (1) Nws tuaj yeem tsim cov khoom nrog cov duab geometric nyuaj; (2) High compact density thiab uniform ntom; (3) Zoo adaptability rau cov ntaub ntawv; (4) Cov txheej txheem yooj yim thiab tus nqi qis.

Tam sim no, WFC thev naus laus zis tseem nyob rau theem pib ntawm kev tshawb fawb txawv teb chaws, thiab kev tshawb fawb ntawm nws cov cuab yeej tsim khoom tseem ceeb thiab cov txheej txheem densification tseem tsis tau tshaj tawm.