① Tempering
Lub hom phiaj tempering ntawm precision casting khoom suav nrog cov hauv qab no:
1. Txo cov brittleness thiab tshem tawm lossis txo cov kev ntxhov siab sab hauv. Muaj kev ntxhov siab sab hauv thiab brittleness tom qab quenching. Yog hais tias tsis tempered nyob rau hauv lub sij hawm, lub precision casting yuav feem ntau deform los yog txawm tawg.
2. Tau txais cov khoom siv kho tshuab uas xav tau los ntawm cov khoom ua haujlwm. Tom qab quenching, lub workpiece muaj siab hardness thiab siab brittleness. Txhawm rau ua kom tau raws li qhov yuav tsum tau muaj ntawm cov khoom sib txawv ntawm ntau lub workpieces, lub hardness tuaj yeem hloov kho los ntawm qhov tsim nyog tempering kom txo brittleness thiab tau txais qhov yuav tsum tau muaj toughness thiab plasticity.
3. ruaj khov workpiece loj
4. Rau qee cov hlau alloy uas nyuaj rau soften tom qab annealing, kub tempering feem ntau yog siv tom qab quenching (los yog normalizing), thiaj li kom aggregate carbides nyob rau hauv cov hlau kom zoo thiab txo cov hardness rau machining.
② Kev tsim cov txheej txheem precision castings kuj xav tau normalizing
Normalizing yog txheej txheem kev kho cua sov uas lub casting yog rhuab mus rau 30-50 ℃ siab tshaj qhov tseem ceeb kub thiab txias nyob rau hauv tseem huab cua tom qab tuav rau lub sij hawm tsim nyog, uas yog hu ua normalizing. Lub hom phiaj tseem ceeb ntawm normalizing yog los kho cov qauv, txhim kho cov khoom ntawm cov hlau thiab tau txais cov qauv nyob ze rau qhov sib npaug.
Qhov sib txawv tseem ceeb ntawm normalizing thiab annealing txheej txheem yog qhov txias ceev ntawm normalizing yog me ntsis sai dua, yog li lub voj voog ntau lawm ntawm normalizing kev kho cua sov yog luv. Yog li ntawd, thaum annealing thiab normalizing tuaj yeem ua tau raws li qhov yuav tsum tau ua ntawm cov khoom, normalizing yuav tsum raug xaiv kom deb li deb tau. Feem ntau nruab nrab thiab qis carbon steel billets yog feem ntau normalized thaum tshav kub kub kho. Feem ntau, alloy billets feem ntau yog annealed. Yog hais tias normalizing yog siv, lub hardness tom qab normalizing yog siab vim lub ceev txias ceev, uas yog tsis conducive rau txiav.
