Pa zuag qhia tag nrho quenching tsis txaus kom ua tau raws li qhov siab hnav tsis kam thiab matrix zog thiab toughness yuav tsum tau ntawm tuag-casting pwm.
Kev kho kom muaj zog saum npoo tuaj yeem tsis tsuas yog txhim kho qhov hnav tsis kam thiab lwm yam khoom ntawm cov pwm tuag-casting, tab sis kuj tseem muaj lub zog txaus thiab lub zog ntawm lub substrate, thaum tiv thaiv cov hlau molten los ntawm lo rau pwm thiab corroding. Qhov no muaj txiaj ntsig zoo hauv kev txhim kho kev ua tau zoo ntawm cov pwm tuag-casting, txuag cov ntsiab lus ntawm cov hlau, txo cov nqi, ua kom muaj peev xwm ntawm cov ntaub ntawv, thiab siv cov ntaub ntawv tshiab zoo dua.
Kev xyaum ntau lawm tau pom tias kev kho qhov chaw ntxiv dag zog yog qhov tseem ceeb rau kev txhim kho cov pwm tuag-casting zoo thiab txuas ntxiv lawv lub neej kev pab cuam. Cov txheej txheem kho kom muaj zog saum npoo uas feem ntau siv rau cov pwm tuag xws li carburizing, nitriding, nitrogen carbon co carburizing, boronizing, chromizing, thiab txhuas infiltration.
1. Carbonization
Carbonization yog tam sim no siv dav siv tshuaj kho cua sov txoj hauv kev lag luam. Cov yam ntxwv ntawm tus txheej txheem yog raws li nram no: tsawg alloy tuag steel nrog nruab nrab mus rau tsawg carbon ntsiab lus thiab siab alloy tuag steel nrog nruab nrab mus rau high carbon cov ntsiab lus yog rhuab mus rau 900 degree -930 degree nyob rau hauv ib tug active nruab nrab (carburizing agent) rau carbonization, cia cov pa roj carbon atom nkag mus rau txheej txheej ntawm cov tuag. Tom qab ntawd, quenching thiab low-temperature tempering yog nqa tawm los muab qhov chaw thiab cov tub ntxhais ntawm cov khoom sib txawv, cov qauv, thiab cov khoom.
Carbonization muab faib ua khoom carburizing, kua carburizing, thiab roj carburizing. Tsis ntev los no, nws kuj tau tsim los rau hauv kev tswj cua carburizing, nqus carburizing, thiab benzene ion carburizing.
2. Nitriding
Cov txheej txheem ntawm nitrogen infiltration rau saum npoo ntawm hlau yog hu ua nitriding ntawm hlau. Nitriding tuaj yeem muab cov pwm pwm nrog cov tawv tawv dua, hnav tsis kam, qaug zog ua haujlwm, tawv tawv tawv, thiab corrosion tsis kam tshaj carburizing. Vim tias qhov kub tsis tshua muaj nitriding (500-570 degree), qhov deformation ntawm cov pwm tom qab nitriding yog me me.
Cov txheej txheem nitriding muaj xws li cov khoom nitriding, kua nitriding, thiab roj nitriding. Tam sim no, cov thev naus laus zis tshiab xws li ion nitriding, nqus nitriding, electrolytic catalytic nitriding, thiab high-frequency nitriding tau siv dav, uas ua rau lub sijhawm nitriding luv thiab tau txais cov txheej txheem nitriding zoo.
3. Nitrogen carbon co infiltration
Nitrogen carbon co infiltration yog cov txheej txheem qis nitrogen carbon co infiltration (530 degree -580 degree) uas ib txhij infiltrates nitrogen thiab carbon rau hauv nruab nrab uas muaj activated carbon thiab nitrogen atoms, nrog nitrogen infiltration raws li txoj kev tseem ceeb. Lub brittleness ntawm nitrogen carbon co infiltration txheej yog me me, thiab lub sij hawm co infiltration yog luv dua li lub sij hawm nitriding. Tom qab nitrogen carbon co diffusion, thermal qaug zog kev ua tau zoo ntawm cov pwm tuag-casting tuaj yeem txhim kho tau zoo.
Cov kev ua hauj lwm hnyav yuav tsum tau tuag-casting pwm kom muaj qhov kub thiab txias txhua yam khoom, tiv taus txias thiab kub qaug zog, tsis kam ua kua hlau yaig, oxidation tsis kam, thiab siab hardenability thiab hnav tsis kam. Kev kho cua sov yog cov txheej txheem tsim khoom tseem ceeb uas txiav txim siab cov khoom no.
Kev kho cua sov ntawm cov pwm tuag-casting yog hloov cov microstructure ntawm cov hlau, kom qhov saum npoo ntawm cov pwm tau txais kev ua haujlwm siab thiab hnav tsis kam, thaum lub hauv paus tseem muaj lub zog txaus thiab tawv, thiab tiv thaiv cov hlau molten los ntawm cov pwm. thiab corroding. Xaiv cov txheej txheem kho cua sov uas tsim nyog tuaj yeem txo cov khoom pov tseg thiab txhim kho kev pab cuam lub neej ntawm pwm.
