1.Dab tsi ua rau tsis txaus los tiv thaiv -adhesion?
Mechanism: Carbide hais nyob rau hauv txias -rolled coils ua xws li "hard abrasive grains." Yog hais tias lub matrix hardness ntawm cov hlau tuag tsis txaus, los yog yog hais tias cov carbide hais nyob rau hauv lub tuag yog me dua lub hard particles nyob rau hauv cov khoom, lub hard particles nyob rau hauv cov khoom yuav ua zoo li cov ntaub ntawv, microscopically txiav cov tuag.
Kev daws: Yog tias siv Cr12MoV zoo tib yam siv los stamp 65Mn, hnav yuav nrawm. Nws raug nquahu kom hloov mus rau hmoov siab - steel ceev (xws li ASP23) lossis cemented carbide, thiab ua kom sib sib zog nqus cryogenic kho kom tshem tawm cov austenite thiab txhim kho matrix hardness.
2.Yuav ua li cas nrog cov txheej txheej tev lossis xaiv tsis raug?
Phenomenon: Muaj coob tus neeg ntseeg hais tias tej txheej yuav muab hnav tsis kam.
Kev Ntsuam Xyuas: Yog tias TiN txheej (kub daj) yog siv los ua cov phaj tuab, cov txheej txheem yuav tev tawm raws li kev cuam tshuam vim TiN tsis zoo. Lub tev txheej tawg tawg lawv tus kheej ua abrasive hais, exacerbating hnav. Rau cov tuab tuab- dov coils, CrN txheej lossis TD txheej (vanadium carbide VC) feem ntau muab kev hnav zoo dua thiab muaj zog adhesion rau lub substrate.
3.Dab tsi yog qhov ua rau lubrication tsis ua haujlwm?
Roj zaj duab xis rupture:
Mechanism: Txias -rolled coil stamping muaj ciam teb lubrication nyob rau hauv siab. Yog tias qhov kev ua haujlwm siab tshaj plaws (EP) ntawm cov roj lubricating tsis txaus, lossis daim ntawv thov roj tsis txaus, kev sib cuag ncaj qha yuav tshwm sim ntawm qhov tuag thiab cov ntawv hlau, uas ua rau cov hlau tsis muaj hlau vuam thiab tearing, piv txwv li, "nplaum hnav."
Ntawm -kev soj ntsuam ntawm qhov chaw: Saib xyuas qhov chaw ntawm lub punch lossis tuag. Yog tias cov khawb zoo (ploj grooves) sib npaug rau cov kev taw qhia stamping lossis hlau smears (tsim- txog ntug) tshwm), nws qhia tias lubrication tsis ua haujlwm.
Txoj kev lubrication tsis raug:
Kev ceev oiling feem ntau tsis sib xws. Thaum lub sij hawm tas mus li ntau lawm, qhov kub thiab txias hauv cheeb tsam ua rau cov roj lubricating evaporate lossis xau, ua rau lub xeev "dry khiav" hauv ib nrab ntawm cov txheej txheem.
4.Dab tsi yog cov teeb meem ntsig txog oxide nplai thiab kev suav nrog?
Residual Iron Oxide Scale:
Phenomenon: Yog tias cov txheej txheem annealing tsis raug tswj kom zoo, txheej txheej oxide nyias (Fe3O4 / FeO) yuav nyob twj ywm rau ntawm qhov chaw txias -rolled coil.
Qhov laj thawj: Txawm hais tias txheej txheej oxide no tsis nyuaj, nws yog nkig. Thaum lub sij hawm stamping, nws tawg mus rau hauv cov khoom nyuaj uas nkag mus rau hauv qhov khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob.
Carbide Segregation:
Mechanism: Tshwj xeeb tshaj yog rau siab - carbon steel txias- dov coils (xws li SK85, C75S), yog tias muaj cov carbides loj hauv cov khoom (steel zeb smelting thiab dov tsis xws luag), cov carbides loj no sib npaug rau "sand grains." Thaum lawv hla dhau qhov khoob khoob, lawv ncaj qha khawb qhov tuag nto.
5.Yuav ua li cas nrog qhov sib txawv uas me dhau?
Logic: Thaum lub sij hawm blanking, yog tias qhov clearance ntawm ib sab yog tsawg dua 3% -4% ntawm cov khoom thickness (rau high-strength steel), lub extrusion siab yuav nce exponentially. Qhov loj extrusion siab no ua rau muaj qhov kub ntawm qhov kub ntawm qhov tuag (txog 200-300 degree), uas ua rau thermal softening, txo cov tawv hardness, thiab ceev hnav.
Kev tshuaj xyuas: Yog tias qhov hnav yog tsom rau ntawm qhov txiav ntug thiab nrog rau cov kab nrib pleb zoo (crazing), nws muaj feem ntau tias qhov kev tshem tawm tsawg dhau, ua rau muaj cua sov.