Kev Txhim Kho Tshiab ntawm Kev Siv Tshuab: Kev Tswj Xyuas Microstructure Precision, Kev Tsim Khoom Siv Tshuab & Kev Siv Cov Hlau Uas Muaj Kev Ua Haujlwm Zoo thiab Pheej Yig GPa-Qib Txias-Stamping

Tsav los ntawm Tuam Tshoj txoj kev npaj ua ob-carbon thiab kev hloov pauv tsheb tshiab-lub zog sai, kev txhim kho synergistic ntawm kev sib tsoo-kev nyab xeeb kev ua tau zoo tau dhau los ua lub hom phiaj tseem ceeb thoob ntiaj teb rau kev lag luam tsheb. GPa-qib txias-stamping Hlau cov ntawv (lub zog tensile ≥1 GPa) tau txais kev saib xyuas dav dav ntawm cov neeg thoob ntiaj teb Hlaucov chaw tsim khoom thiab OEMs rau lub zog siab, tiv taus corrosion zoo, tus nqi tsim khoom qis thiab kev siv hluav taws xob tsawg. Txawm li cas los xij, peb qhov teeb meem loj hauv kev lag luam tau txwv tsis pub tsim khoom thiab siv GPa-qib txias-stamping ntev Hlau.

Ua ntej, kev sib koom ua ke ntawm ntau yam kev ua tau zoo yog qhov nyuaj rau ua tiav. Lub zog siab heev, kev ua tau zoo, kev tiv thaiv hydrogen-embrittlement thiab kev tiv thaiv kua-hlau-embrittlement (LME) yog qhov nyuaj rau tau txais tib lub sijhawm. Cov kev daws teeb meem ib txwm muaj kev vam khom rau cov khoom siv kim xws li Mo thiab Cr, thawb cov nqi khoom siv. Lub hauv paus tseem ceeb rau kev tsim cov khoom siv qis-nqi siab-kev ua tau zoo GPa-qib Hlau ntawm kev tsim kho microstructure tseem tsis meej.

Qhov thib ob, kev tsim khoom ruaj khov thiab ua haujlwm tau zoo yog qhov nyuaj. Qib GPa kub dov Hlau tsim cov nplai Si-nplua nuj oxide ntom ntom, ua rau kev ua haujlwm tsis zoo thiab qhov zoo ntawm qhov chaw tsis zoo. Cov qauv mos-tawv sib txawv hauv cov kab kub ua rau muaj kev hloov pauv ntawm lub zog txias-dov, ua rau ntug tawg thiab kab tawg. Cov kauj hlau kub-dov siab ua rau muaj zog heev ze rau qhov txwv ntawm lub tshuab txias-zom. Dhau li ntawm qhov ntawd, kev ua kom tawv thiab kev sib txhuam tsis sib xws thaum lub sijhawm dov txias ua rau cov qauv dov ib txwm tsis raug rau kev kwv yees cov duab, ua rau qhov tseeb tsis zoo thiab poob ntau yam khoom seem.

Qhov thib peb, daim ntawv thov thiab cov txheej txheem ntsuam xyuas tsis tiav. Hlau raug kev pheej hmoo loj heev thaum lub sijhawm stamping thiab LME thaum lub sijhawm vuam, ua rau muaj kev phom sij rau kev tsim cov khoom thiab kev ntseeg siab ntawm kev sib koom ua ke. Cov qauv ntsuas kev ntsuas rau hydrogen embrittlement thiab kev ua haujlwm qaug zog tsis txaus rau kev tsim nyog thiab kev xaiv cov khoom siv. Tsis muaj kev sib xyaw ua ke "khoom siv-txheej txheem-component" kev tsim qauv yav tom ntej, GPa-qib Hlau daim ntawv thov raug txwv, nrog nws cov feem hauv BIW tsheb qis dua 5%.

Qhov project no siv cov logic kev sib koom tes ua ke tag nrho: "kev tshawb fawb txog kev siv tshuab thiab kev siv khoom". Kev tsom mus rau cov khoom lag luam uas tsis muaj txiaj ntsig zoo, kev tsim khoom tsis ruaj khov thiab cov xwm txheej txwv, kev tshawb fawb piav qhia txog cov teebmeem microstructure ntawm kev ua kom zoo nkauj, hydrogen embrittlement thiab LME rau cov khoom siv qis C-Mn-Si GPa-qib. Hlau, tsim kom muaj ntau theem microstructure tsim txoj kev thiab tsim cov txheej txheem tswj hwm ntau theem & gradient-stabilized microstructure. Ntawm sab kev tsim khoom, ib lub kaw lus tswj hwm ntau txheej txheem uas suav nrog "surface regulation-matrix softening reconstruction-intelligent collaborative rolling" tau tsim. Rau daim ntawv thov & kev ntsuam xyuas, springback thiab spot-welding LME tau daws teeb meem; cov qauv xeem & kev ntsuam xyuas rau hydrogen embrittlement thiab qaug zog tau teeb tsa. Ib lub kaw lus tsim qauv sib zog EVI-embedded muab cov kev daws teeb meem sib zog ua tiav hauv tsheb.

Cov Kev Ua Tiav Tshiab Tseem Ceeb

1. Txoj kev tsim kho microstructure ntau theem rau qib qis-alloy GPa Hlau nrog ntau yam khoom sib npaug Qhov project qhia txog cov teebmeem sib txuas ntawm ferrite, gradient-stabilized retained austenite thiab fresh martensite ntawm formability, hydrogen-embrittlement crack initiation thiab LME propagation. Heterogeneous deformation-induced (HDI) strengthening thiab transformation-induced plasticity (TRIP) los ntawm gradient-stabilized austenite ua ke txhim kho formability. Lub qhov rais microstructure zoo tshaj plaws tau lees paub: 10% ‑ 30% ferrite, ≥12% gradient-stabilized austenite thiab xoom fresh martensite. Ferrite suppresses zinc segregation ntawm cov ciam teb ntawm cov noob kom qeeb LME crack loj hlob thiab blunts hydrogen-crack tips; highly stabilized austenite relieves local stress thiab qeeb hydrogen-induced fracture. Raws li cov kev tshawb pom saum toj no, ib txoj kev xav tshiab ntawm kev tsim kho ntau theem tau muab tso tawm: ferrite ntsuas + gradient-stabilized austenite + xoom tshiab martensite.

Kev sib raug zoo ntawm cov kev ntsuas annealing tas mus li thiab ntau theem microstructures raug kawm. Kev cuam tshuam ntawm ferrite orientation-dependent rau ntawm cov khoom gradient faib tawm hauv austenite thiab ntau theem martensitic transformation tau meej meej. Cov teebmeem ntawm tus nqi txias thiab qhov kub quenching rau theem hloov pauv kinetics tau ntsuas. Txhawb nqa los ntawm ultra-fast-cooling tas mus li annealing & galvanizing kab, ntau theem kev koom tes gradient-stabilization tswj technology tau tsim. Ob qib GPa-qib txias-stamping steel nqi qis (980 MPa thiab 1180 MPa) tau tsim tiav. Tsis muaj Mo / Cr alloy ntxiv kim, cov hlau txo cov nqi ton-steel ntau dua 1100 CNY. Piv nrog rau cov qauv thoob ntiaj teb, qhov piv ntawm qhov-nthuav dav nce 46%, hydrogen-embrittlement tsis kam zoo dua ntau dua 2 zaug, qhov chaw-welding LME tawg raug tshem tawm tag nrho nrog 100% qhov chaw-weld txais tus nqi.

2. Cov thev naus laus zis sib koom tes ntau txheej txheem daws teeb meem pickling, strip-breakage thiab cov duab-control bottlenecks Txhawm rau daws qhov teeb meem ntawm lub zog txias-dov ntau dhau los ntawm cov kab kub muaj zog siab, matrix homogenization & softening reconstruction technology rau cov kauj kub-dov tau tsim. Kev ua kom sov ntug, kev tiv thaiv ntug hloov kho thiab asymmetric U-type coiling ua tiav homogeneous kub-dov microstructure. Los ntawm kev hloov pauv theem kub siab, kev rov qab thiab kev rov ua dua zoo li qub, martensite-bainite matrix raug hloov mus rau hauv equiaxed coarsened ferrite-pearlite, uas txo qis lub zog kub-band. Qhov ntev ntawm lub taub hau-twist raug luv los ntawm 20 m mus rau hauv 10 m, txiav ton-steel tus nqi ze li ntawm 200 CNY thiab txo qis lub zog txias-dov los ntawm 45%.

Ib qho kev tsim kho tshiab ntawm EPS mechanical descaling ua ke nrog turbulent-flow pickling tau siv. Cov nplai nplua nuj Si-nplua nuj raug tshem tawm zoo thiab cov kab me me rau kev nkag mus rau hauv cov kua qaub tau tsim. Kev ceev ntawm pickling tshaj 100 m / min (siab dua 25% piv rau cov neeg sib tw thoob ntiaj teb), thiab qhov sib txawv ntawm xim ntawm qhov chaw poob qis dua 0.18%.

Ib qho qauv thermo-mechanical coupled dynamic deformation-resistance tau tsim. Genetic-algorithm optimized BP-neural-network, GWO-KELM rolling-force prediction thiab GSTSA global optimization algorithm ua tiav ntau lub hom phiaj co-optimization rau kev sib txhuam, strip shape thiab qhov zoo ntawm qhov chaw. Cold-strip shape closed-loop error ≤0.5%, rolling strip-breakage rate qis dua 0.8%, thiab cov txheej txheem yield tsa siab tshaj 96%.

3. Cov thev naus laus zis ntsuam xyuas daim ntawv thov thiab lub tshuab ua kom lub cev sib dua rau kev tsim khoom loj hauv tsheb Txhawm rau daws qhov teeb meem ntawm kev nias lub caij nplooj ntoos hlav thiab qhov chaw vuam LME, kev sib txuas ntawm cov qauv ntawm cov pwm thiab cov txheej txheem ntawm lub caij nplooj ntoos hlav tau raug qhia. Kev tswj hwm ntau lub hom phiaj raws li lub vojvoog ntawm lub ces kaum ntawm lub pwm, qhov ceev ntawm kev nias thiab kev tsim qauv kos duab txhim kho qhov tseeb ntawm cov khoom. Ib qho tshiab "multi-pulse + tempering" qhov chaw vuam txheej txheem nthuav dav lub qhov rais txheej txheem ruaj khov los ntawm 0.8 kA mus rau 1.6 kA.

Rau qhov sib txawv ntawm kev ntsuam xyuas kev ua haujlwm ntawm kev pabcuam: thawj zaug tau npaj txoj kev sim hydrogen-embrittlement raws li kev kos duab tob rau GPa-qib txias-stamping ntawv kom kov yeej qhov tsis zoo ntawm kev sim U-bend ib txwm muaj. Ib qho khoom siv tiv thaiv kev khoov uas tsim los ntawm tus kheej daws qhov tsis ua haujlwm ntawm kev khoov rau cov qauv qaug zog nyias-gauge (

Ib lub tshuab tsim qauv EVI puv-lub voj voog sib dua tau tsim los ntawm BIW ntau lub hom phiaj kev tshuaj xyuas qhov rhiab heev rau qib sib txawv ntawm cov khoom. 1.0 hli & 1.4 hli nyias-gauge 980 MPa GPa-qib hlau hloov cov hlau 350-650 MPa rau cov ntawv thov lub rooj zaum. Cov khoom lag luam tau txais yuav rau 31 hom khoom siv tsheb suav nrog B-pillars thiab cov tsev roj teeb. GPa-qib hlau BIW daim ntawv thov piv nce ntawm 5% mus rau 11%, qhov hnyav txo qis tshaj plaws ib feem ncav cuag 25%, BIW pawg-txo tau 10%, ua tiav C-NCAP 5-lub hnub qub-kev nyab xeeb kev sib tsoo. Cov ntaub ntawv tau tsim ntau rau 28 lub tsheb qauv tseem ceeb.

Cov Txiaj Ntsig ntawm Daim Ntawv Thov & Cov Txiaj Ntsig ntawm Kev Lag Luam thiab Kev Sib Raug Zoo

Cov kev tsim kho tshiab tag nrho uas suav nrog kev tshawb fawb txog microstructure, cov txheej txheem tsim khoom, cov txheej txheem ntsuam xyuas thiab kev siv tsheb tau ua tiav. Kev siv cov khoom sib xyaw ua ke C-Mn-Si tsawg ntxiv rau kev txias sai heev, qhov sib piv nthuav dav tshaj 70%; kev tiv thaiv hydrogen-embrittlement yog ob npaug; qhov chaw vuam LME tawg raug tshem tawm tag nrho. Cov khoom siv tiav dhau cov khoom siv thoob ntiaj teb nrog cov nqi ton-steel txiav ntau dua 1100 CNY.

Kev siv tshuab Mechanical-descaling & turbulent-pickling technology ua rau kev ua haujlwm ntawm pickling nce ntxiv 25%. Kev tsim kho dua tshiab ntawm Hot-band homogenization-softening txo cov nqi pov tseg los ntawm 90% thiab lub zog dov los ntawm 45%, daws qhov teeb meem nyuaj ntawm pickling, strip breakage thiab kev tswj cov duab tsis zoo rau cov hlau muaj zog siab kom ua rau muaj kev tsim khoom loj ruaj khov.

Cov teeb meem engineering ntawm stamping springback thiab spot-welding LME tau daws lawm. Tsib pawg qauv tau tsim los sau cov qhov sib txawv hauv hydrogen-embrittlement & kev ntsuam xyuas qaug zog. Cov khoom lag luam tau muab rau 11 lub npe loj OEM suav nrog GAC, BYD, Mercedes-Benz, BMW thiab Audi, suav nrog 28 lub tsheb nrog ntau dua 10 lab lub tsheb. Cov zis tag nrho ncav cuag 810 000 tons hauv peb xyoos dhau los, coj 4.7 billion CNY tus nqi tso zis tshiab thiab 680 lab CNY txiaj ntsig kev lag luam. Peb caug rau daim ntawv pov thawj tsim khoom tsim khoom thiab peb caug yim daim ntawv kawm tiav.

Qhov project no ua rau muaj peev xwm muab khoom siv hauv tsev ntawm cov hlau muaj zog siab rau tsheb, coj cov qauv kev siv tshuab thoob ntiaj teb ntawm GPa-qib txias-stamping hlau thiab txhawb kev txhim kho kev lag luam ntawm kev lag luam hlau tsheb.

Tau los ntawm: Lub Koom Haum Suav rau Cov Hlau