Cov txheej txheem tsim cov log forged yog forged cov "hlau khov" rau hauv cov duab ntawm lub log los ntawm kev siab siab (kaum tawm txhiab tons ntawm lub siab). Vim muaj ntau qhov kev sib tsoo siab siab, cov molecules ntawm cov hlau alloys me dua, qhov sib txawv me dua, thiab qhov ceev dua. Lub log hub tuaj yeem ua tiav qhov rigidity txaus nrog cov khoom siv raw tsawg dua, thiab qhov hnyav tag nrho yuav sib dua. Hauv cov lus yooj yim, forging yog ib daim ntawv ntawm cov txheej txheem los ntawm "khoom khov" mus rau "khoom khov".
Cov log tsheb aluminium alloy muaj kev tiv thaiv kev cuam tshuam, lub zog tensile thiab lub zog thermal ntau dua li cov log tsheb hlau. Qhov no kuj yog ib qho laj thawj vim li cas aluminium alloy ua lub luag haujlwm tseem ceeb hauv kev lag luam tiv thaiv thiab kev lag luam dav hlau. Qhov tseeb ntawm lub log tsheb aluminium alloy yog siab txog li 0.05 hli, thiab qhov sib npaug khiav zoo, uas yog qhov zoo rau kev tshem tawm qhov tshwm sim ntawm lub kauj tsheb jitter. Vim muaj kev txwv ntawm kev tsim khoom, cov log tsheb hlau ib txwm yog monotonous thiab nruj, tsis muaj kev hloov pauv; cov log tsheb aluminium alloy muaj ntau yam qauv tsim, ua ke nrog cov xim zoo thiab cov teebmeem xim, yog li ua kom tus nqi thiab kev zoo nkauj ntawm lub tsheb zoo dua.
Tam sim no, kev forging yog txoj kev uas tuaj yeem ua tiav qhov sib piv ntawm qhov rigidity/weight siab tshaj plaws ntawm txhua txoj kev tsim khoom log. Ntau tus neeg ua si tswj kev ua tau zoo nyiam heev rau forging log. Piv nrog rau casting, forged log muaj lub zog siab dua, kev nyab xeeb zoo dua, plasticity ntau dua, thiab qhov hnyav sib dua. Qhov hnyav sib dua coj kev txhim kho lub zog thiab kev rhiab heev.