Cov txheej txheem kev kho cua sov yog siv dav hauv kev tsim pwm tuag casting, uas tuaj yeem txhim kho kev ua haujlwm ntawm cov khoom tuag thiab ua kom lub neej ntev ntawm kev tuag. Tsis tas li ntawd, kev kho cua sov kuj tuaj yeem txhim kho kev ua haujlwm ntawm kev tuag casting pwm, txhim kho kev ua haujlwm zoo, txo cov cuab yeej siv, yog li ntawd, nws tuav txoj haujlwm tseem ceeb hauv kev tsim pwm.
Tuag casting pwm feem ntau yog ua los ntawm cov hlau, thiab cov pa cua sov kho hauv cov txheej txheem tsim khoom yog: spheroidizing annealing, stabilization kho, tempering thiab quenching thiab tempering. Los ntawm cov txheej txheem kev kho cua sov no, cov qauv ntawm cov hlau hloov pauv, kom cov pwm tuag-casting tuaj yeem tau txais cov qauv tsim nyog thiab cov khoom.
1. Ua ntej ua tiav
Kev tuag casting tuag dawb paug tom qab forging yuav tsum raug spheroidizing annealing los yog tempering kho cua sov kom tshem tawm kev ntxhov siab thiab txo hardness, pab txiav, thiab npaj lub koom haum rau kev kho cua sov zaum kawg. Tom qab annealing, uniform qauv thiab dispersed carbide tuaj yeem tau los txhim kho lub zog thiab toughness ntawm cov hlau tuag. Vim hais tias cov nyhuv ntawm tempering kev kho mob yog zoo dua li ntawm spheroidizing annealing, cov pwm uas muaj zog thiab toughness yuav tsum yog feem ntau hloov los ntawm tempering annealing.
2. Kev kho kom ruaj khov
Feem ntau hais lus, cov kab noj hniav ntawm cov pwm tuag casting yog qhov nyuaj dua, thiab qhov kev ntxhov siab sab hauv yuav loj thaum ua haujlwm ntxhib, thiab qhov deformation yuav raug tsim thaum quenching. Txhawm rau tshem tawm kev ntxhov siab, kev ntxhov siab yuav tsum tau ua tom qab roughing, uas yog, kev kho kom ruaj khov.
Cov txheej txheem yog: cua sov kub 650 degree -680 degree , tshav kub preservation 2-4h tom qab cua txias. Tuag casting pwm nrog ntau cov duab yuav tsum tau txias rau 400 degree C lossis qis dua. Tom qab quenching thiab tempering cov tuag, EDM yuav tsim ib txheej metamorphic ntawm lub machining nto, uas yog ib qho yooj yim ua rau cov hlau txiav tawg, thiab ib tug qis kub kev ntxhov siab annealing yuav tsum tau nqa tawm.
3. Quenching preheating
Tuag casting hlau yog feem ntau siab alloy steel, vim nws tsis zoo thermal conductivity, nyob rau hauv lub quenching cua sov yuav tsum tau qeeb, feem ntau siv preheating ntsuas. Rau cov pwm uas tsis tshua muaj kev tiv thaiv deformation, tus naj npawb ntawm preheating yuav tsawg dua yam tsis muaj cracking, tab sis cov pwm uas muaj kev tiv thaiv deformation siab yuav tsum tau preheated ntau zaus. Preheating ntawm qhov kub thiab txias (400 degree -650 degree) feem ntau yog ua nyob rau hauv lub cub tawg cua; Rau qhov kub siab dua preheating, ntsev da dej rauv yuav tsum tau siv, thiab lub sij hawm preheating tseem ntsuas 1 min / mm.
4. quenching cua sov
Rau kev tuag casting steel, siab quenching cua sov kub yog qhov zoo rau kev txhim kho thermal stability thiab softening tsis kam, txo thermal qaug zog nyiam, tab sis yuav ua rau grain loj hlob thiab grain ciam tsim ntawm carbide, toughness thiab plasticity poob, ua rau loj tawg. Yog li ntawd, thaum tuag casting pwm yuav tsum muaj zog dua, tsis tshua muaj kub quenching yog feem ntau siv, thiab thaum kub kub lub zog yuav tsum tau, siab dua kub quenching yog siv.
Txhawm rau kom tau txais kev ua haujlwm siab kub zoo, xyuas kom meej tias cov carbide tuaj yeem yaj tag nrho, kom tau txais cov khoom sib xyaw ntawm austenite, quenching thiab tuav lub sijhawm ntawm cov pwm tuag casting yog qhov ntev, feem ntau hauv cov ntsev da dej rauv cua sov thiab tuav coefficient. ntawm {{0}} 8-1.0 min/mm.
5. Quenching thiab txias
Roj txias yog siv rau tuag casting pwm nrog cov duab yooj yim thiab tsis tshua muaj deformation tiv thaiv cov cai. Tuag casting pwm nrog cov duab complex thiab siab tiv thaiv deformation yuav tsum siv fractional quenching. Txhawm rau tiv thaiv kev deformation thiab tawg, txawm tias siv txoj kev txias dab tsi, nws tsis raug tso cai rau txias rau chav sov, feem ntau yuav tsum txias mus rau 15 0 degree -180 degree, tam sim ntawd npau taws tom qab qee yam Lub sij hawm ntawm lub sij hawm soaking, lub sij hawm soaking yuav xam raws li 0.6 min / mm.
6. Kub
Tuag casting tuag yuav tsum tau tempered tag nrho, feem ntau tempered peb zaug. Thawj tempering kub yog xaiv nyob rau hauv qhov kub thiab txias ntawm lub thib ob hardening; Qhov thib ob tempering kub yuav tsum raug xaiv kom cov pwm mus txog qhov yuav tsum tau hardness; Qhov thib peb tempering yog qis dua qhov thib ob l0 degree -20 degree . Tom qab tempering, roj txias los yog cua txias yog siv, thiab lub sij hawm tempering tsis tsawg tshaj li 2 teev.
