Vim lub hom phiaj sib txawv ntawm precision castings, muaj ntau yam kev kho cua sov, uas tuaj yeem muab faib ua ob pawg. Thawj yog tias lub microstructure yuav tsis hloov lossis yuav tsum tsis txhob hloov los ntawm kev kho cua sov, thiab qhov thib ob yog qhov yooj yim microstructure yuav hloov. Thawj cov txheej txheem kev kho cua sov yog siv los tshem tawm cov kev ntxhov siab sab hauv, uas yog tshwm sim los ntawm cov cua txias sib txawv thiab cov xwm txheej thaum lub sij hawm stainless hlau casting. Cov qauv, lub zog thiab lwm yam khoom siv kho tshuab yuav tsis hloov pauv vim kev kho cua sov.
Rau hom thib ob ntawm kev kho cua sov, Al Qaeda tau hloov pauv ntau, uas tuaj yeem muab faib ua tsib pawg:
1. softening annealing: nws lub hom phiaj yog kom decompose carbides, txo lawv hardness thiab txhim kho lub machinability. Rau nodular cam khwb cia hlau, nws lub hom phiaj yog kom tau txais ntau ferrite qauv.
2. Normalizing kev kho mob: lub hom phiaj tseem ceeb yog kom tau pearlite thiab sorbite qauv thiab txhim kho cov khoom ntawm stainless hlau casting.
3. Kev kho quenching: feem ntau kom tau cov hardness siab dua los yog hnav lub zog thiab siab heev hnav tsis kam.
4. Kev kho deg hardening: feem ntau kom tau cov txheej txheej hardening thiab siab hnav tsis kam.
5. Kev kho dej nag los nag: nws yog qhov tseem ceeb kom tau txais lub zog siab yam tsis muaj kev hloov pauv hauv elongation.
