Hais txog cov lus nug ntawm seb puas yog txhuas txhuas tuag-casting qhov chaw tuaj yeem kho cua sov, peb tuaj yeem paub tias aluminium alloy castings tuaj yeem kho cua sov los ntawm kev sib xyaw cov khoom siv thiab cov txheej txheem kev paub txog.
Cov txheej txheem kev kho cua sov ntawm aluminium alloy castings tuaj yeem muab faib ua plaub pawg hauv qab no:
1. Annealing kev kho mob: Aluminium alloy casting yog rhuab mus rau ib tug ntau dua kub (feem ntau yog hais txog 300 degree C), thiab ces cia rau ib lub sij hawm ntawm lub sij hawm, thiab ces qhov kub thiab txias yog txias rau chav tsev kub nrog lub cub tawg. Cov txheej txheem no hu ua annealing. Thaum lub sij hawm annealing txheej txheem, vim lub decomposition ntawm cov khoom tov, cov khoom ntawm lub thib ob theem aggregate, uas tshem tawm cov kev ntxhov siab nyob rau hauv lub casting, zoo stabilizes qhov loj ntawm lub casting, txo deformation, thiab tsub kom lub plasticity ntawm lub casting.
2. Kev kho kev daws teeb meem: Thaum tshav kub kub ntawm casting mus rau qhov kub siab tshaj plaws, nyob ze rau lub eutectic melting point, cia nws nyob rau ntawm qhov kub thiab txias rau lub sij hawm ntev txaus, thiab tom qab ntawd maj mam txias nws kom ua kom tiav qhov kev sib cais ntawm cov khoom ntxiv. Lub xeev kub siab no yog tsau thiab khaws cia hauv chav tsev kub, txheej txheem hu ua kev kho mob. Kev kho tshuaj tuaj yeem txhim kho lub zog, plasticity thiab corrosion kuj ntawm cov casting.
3. Kev laus kev kho mob: Kev laus yog cov txheej txheem ntawm cov cua sov cov tshuaj-kho castings mus rau ib tug tej yam kub thiab txias, tuav lawv rau ib tug tej lub sij hawm ntawm lub sij hawm ua ntej tso tawm, thiab ces maj mam txias lawv mus rau hauv chav tsev kub nyob rau hauv cov huab cua. Yog hais tias kev laus zog yog nqa tawm nyob rau hauv chav tsev kub, nws yog hu ua natural aging; Artificial aging txhais tau hais tias kev laus zog yog nqa tawm ntawm qhov kub siab tshaj li chav tsev kub thiab khaws cia rau lub sijhawm. Cov txheej txheem ntawm kev decomposition ntawm supersaturated cov kua yog hu ua kev laus kev kho mob, uas tuaj yeem kho cov lattice ntawm cov hlau matrix mus rau lub xeev ruaj khov.
4. Kev kho lub voj voog kub thiab txias: Vim qhov rov ua kom sov thiab txias ntawm cov castings kho los ntawm lub voj voog txias thiab kub, qhov no yuav ua rau lub shrinkage thiab expansion ntawm cov khoom siv lattice, ua rau me ntsis txav ntawm cov lattice ntawm txhua theem, thiab cov theem thib ob yog nyob rau hauv Ib lub xeev ruaj khov dua, yog li txhim kho qhov seem stability ntawm lub casting, uas yog heev haum rau tsim cov precision qhov chaw. Aluminium alloys tsis muaj qhov ua rau tawg tawg ntawm qhov kub thiab txias. Txawm hais tias cov khoom siv kho tshuab yuav hloov nrog qhov txo qis, lub zog yuav nce, tab sis cov yas yuav tsis txo. Yog li ntawd, qee zaum txhawm rau txo lossis tshem tawm cov kev ntxhov siab sab hauv ntawm cov casting, qhov casting lossis quenched casting tuaj yeem txias rau -50 degree, -70 degree lossis qis dua rau 2-3 teev, thiab tom qab ntawd rhuab mus rau chav tsev kub hauv huab cua lossis dej kub, lossis Tom qab ntawd cov khoom qub.
