1.Lub hom phiaj tseem ceeb ntawm kev tswj hwm yog dab tsi?
Kev ua tau zoo raws li cov qauv: Ua tiav qhov yuav tsum tau muaj zog, lub zog tensile, thiab elongation (xws li, mos, semi- nyuaj, tag nrho lub xeev nyuaj).
Uniform microstructure: Ua kom tiav cov txheej txheem recrystallization nrog cov nplej loj.
Zoo heev strip zoo: tuav los yog txhim kho qhov ncaj ntawm lub sawb thaum kho cua sov.
Zoo meej nto: Tsis muaj oxidation, khawb, adhesion, thiab roj paug.
2.Lub luag haujlwm ntawm kev tswj nruj yog dab tsi?
Strip shape control: Tsim nyog nro tuaj yeem ncab cov hlua hlau, txhim kho lossis tshem tawm peb - qhov tsis xws luag xws li waviness thiab ntug ripples.
Kev ua haujlwm ruaj khov: Ua kom ruaj khov ua haujlwm ntawm cov sawb hlau hauv qhov cub, tiv thaiv kev sib txawv thiab kev co.
Muaj feem cuam tshuam rau kev ua tau zoo: Kev nro ntau dhau tuaj yeem ua rau "kev nkag siab" hauv cov sawb hlau ntawm qhov kub thiab txias lossis cuam tshuam recrystallization, ua rau lub zog tsis zoo (tshwj xeeb tshaj yog lub zog muaj zog); tsis txaus nro ua rau tsis zoo strip zoo.
3.Lub hauv paus ntsiab lus ntawm kev teeb tsa qhov no yog dab tsi?
**Inlet Seem (Tom qab Ntxuav):** Tsawg nro yog siv, feem ntau rau cov hlua ruaj khov threading.
** Cua sov Tshooj: ** nruab nrab mus rau qis nro yog siv. Vim tias cov sawb lub zog qis tshaj plaws nyob rau theem no (nyob rau hauv lub sijhawm rov qab), kev kub ntxhov tuaj yeem yooj yim ua rau nqaim lossis tawg. Kev nruj ntawm theem no ua lub luag haujlwm tseem ceeb hauv kev txhim kho cov khoom siv los ntawm cov kab nrib pleb.
**Soaking/Heating Section:** Tsawg heev los yog "zero tension" yog siv. Qhov no yog ib theem tseem ceeb rau recrystallization thiab grain loj hlob, yuav tsum tau muaj kev ntxhov siab tso cai rau cov khoom kom soften txaus. Siab nro inhibits recrystallization, ua rau cov khoom muaj zog dua thiab hardness.
**Slow Cooling and Over-Aging Section:** Tsawg mus rau nruab nrab nro yog siv, feem ntau rau stabilizing lub strip zoo.
** Qhov hluav taws xob qhov hluav taws xob (Tom qab cua txias): ** Lub zog sawb tau zoo, tso cai rau kev nruj dua, uas muaj txiaj ntsig zoo rau kev tswj cov sawb zaum kawg.
4.Dab tsi yog qhov cuam tshuam ntawm qhov kub thiab txias profile tswj?
Cua sov Rate: Tus nqi cuam tshuam rau recrystallization nucleation tus nqi. Rau qis- carbon steel, tus nqi nrawm dua tuaj yeem lees txais; rau siab -lub zog steel lossis IF steel, kev tswj hwm yog tsim nyog los tiv thaiv qhov tsis sib xws.
Peak Temperature (Soaking Temperature): Qhov ntsuas tseem ceeb tshaj plaws. Nws txiav txim siab qhov℃ntawm recrystallization thiab grain loj.
Tsawg dhau: Tsis txaus recrystallization, tsis sib xws, lub zog siab.
Siab dhau lawm: Coarse nplej, deteriorated zog, muaj kev pheej hmoo ntawm oxidation nto.
Lub Sijhawm Tuav: Ua kom qhov ntsuas kub tsis sib xws thoob plaws ntawm kab hlais -section thiab ua kom tiav recrystallization. Txiav txim siab los ntawm qhov cub qhov ntev thiab txheej txheem ceev.
Cooling Rate thiab Txoj Kev:
Slow Cooling: Siv los tswj carbide nag lossis daus.
Kev ua kom txias sai: Rau siab - lub zog steel lossis duplex steel, ceev ceev kom txias rau qhov siab tshaj - kev laus kub yog yuav tsum tau kho cov carbon yaj los yog tau txais martensite.
Tshaj - Kub thiab Lub Sij Hawm: Qhov tseem ceeb rau qis- carbon aluminium tua steel, thiab lwm yam, tso cai rau cov pa roj carbon monoxide yaj kom tag nrho los nag, tshem tawm kev laus brittleness, thiab txhim kho formability.
5.Dab tsi yog qhov cuam tshuam ntawm cov txheej txheem ceev ntawm lub tshuab cua sov?
Txheej Txheem Ceev: Lub sijhawm kho cua sov yog txiav txim siab ua ke nrog tus thawj coj ntawm lub cub tawg. Ceev, nro, thiab kub yuav tsum synchronized.
Rauv Atmosphere:
Protective Gas: Feem ntau yog sib xyaw ntawm H₂ thiab N₂ (piv txwv li, 5% H₂ + 95% N₂). H₂ muaj cov khoom txo qis, tiv thaiv oxidation thiab tswj qhov ci ntsa iab.
Dew Point Control: nruj me ntsis tswj qhov cua dew point (feem ntau <-30 degree) kom tiv thaiv kab oxidation los yog nitriding.
Furnace Pressure Control: Ua kom lub siab zoo me ntsis (piv txwv li, kaum tawm Pascals) txhawm rau tiv thaiv huab cua nkag.