Nruam Pre-forming - Nrog rau txoj kev nruam pre-forming, lub forging yog muab ib tug txhais ua ntej-shape nyob rau hauv ib tug tib txoj kev txav. Qee qhov kev siv ua ntej ua ntej yog hydraulic lossis mechanical presses nrog rau cov hlaws. Cov txheej txheem tas mus li muaj qhov zoo dua, tshwj xeeb tshaj yog rau txhuas, uas cov txheej txheem luv luv tsuas yog ua kom txias me ntsis rau cov khoom siv thiab lub sijhawm ua haujlwm siab tuaj yeem ncav cuag. Ib qho tsis zoo yog tias cov qib ntawm kev tsim feem ntau txwv rau hauv cov txheej txheem ua ntej, vim tsuas yog ib qho kev txwv ntawm lub zog thiab kev tsim muaj peev xwm tsuas yog muaj rau cov khoom siv nyob rau hauv ib qho stroke (ntawm cov xovxwm) lossis ib lub kiv puag ncig.