Ukubumba okushushukukwenziwa kwesinyithi ngaphezu kobushushu bokubuyisela ikristale.
Ukwandisa iqondo lokushisa kunokuphucula iplastiki yesinyithi, kukulungele ukuphucula umgangatho wangaphakathi we-workpiece, ukuze kungabi lula ukuqhekeza. Ubushushu obuphezulu bunokunciphisa ukuxhathisa ukuguqulwa kwesinyithi, ukunciphisa iitoni ezifunekayo zoomatshini bokubumba. Kodwa inkqubo yokubumba eshushu, ukuchaneka kwe-workpiece imbi, umphezulu awugudi, ukwenza lula ukuvelisa i-oxidation, i-decarburization kunye nelahleko evuthayo. Xa i-workpiece inkulu kwaye inzima, amandla ezinto eziphathekayo aphezulu kwaye iplastiki iphantsi (njengokuqengqeleka kwepleyiti eyongezelelweyo, ubude bomzobo wentonga yentsimbi ephezulu yekhabhoni, njl. njl.),eshushu forgingiyasetyenziswa. Xa isinyithi (njengelothe, i-tin, i-zinc, ithusi, i-aluminium, njl.) ineplastiki eyaneleyo kwaye inani le-deformation alikho likhulu (njengokuba kuninzi lwe-stamping processing), okanye inani elipheleleyo lokuguqulwa kunye nenkqubo yokubumba esetyenzisiweyo ( ezifana ne-extrusion, i-radial forging, njl. Uluhlu lweqondo lobushushu phakathi kobushushu bokuqala bokubumba kunye neukwenziwa kokugqibelaiqondo lobushushu lokubunjwa okushushu kufuneka libe likhulu kangangoko ukuze kuphunyezwe umsebenzi omninzi wokwenza izinto ngokufudumeza okunye. Nangona kunjalo, phezuluimveliso yokuqalaubushushu buya kukhokelela ekukhuleni okugqithisileyo kweenkozo zetsimbi kunye nokubunjwa kokushisa, okuya kunciphisa umgangatho weendawo zokubumba. Xa ubushushu busondele kwindawo yokunyibilika kwesinyithi, indawo ephantsi yokunyibilika kwezinto ezinyibilikayo kunye ne-intergranular oxidation iya kwenzeka, okukhokelela ekutshiseni. Iibhilithi ezitshiswa ngokugqithisileyo zihlala ziqhekezwa ngexesha lokubunjwa. Injengeleeshushu forginglobushushu: carbon steel 800 ~ 1250 ℃; Ingxubevange yentsimbi yesakhiwo 850 ~ 1150 ℃; Isantya esiphezulu sentsimbi 900 ~ 1100 ℃; Ngokuqhelekileyo kusetyenziswa ialluminiyam ialloy 380 ~ 500℃; Ingxubevange ye-Titanium 850 ~ 1000℃; Ubhedu 700 ~ 900℃.

Ukubumba okubandayoisezantsi kunobushushu bentsimbi yokubunjwa kwesinyithi, edla ngokubizwa ngokuba yingqele yokubumba kwiqondo lobushushu begumbi, kwaye iya kuba phezulu kuneqondo lobushushu begumbi, kodwa ingabi ngaphezu kweqondo lobushushu lekristali lokubunjwa kubizwa ngokuba yi-forging efudumeleyo. Ukuchaneka kokubumba okufudumeleyo kuphezulu, umphezulu ugudileyo ngakumbi kwaye ukuchasana kwe-deformation akukhulu.
I-workpiece eyenziwe ngokubumba okubandayo phantsi kobushushu obuqhelekileyo inokuchaneka okuphezulu kwimilo kunye nobukhulu, indawo egudileyo, iinkqubo ezimbalwa zokucwangcisa kunye nokulula ukuvelisa imveliso. Iindawo ezininzi ezibandayo ezibandayo kunye nezibandayo zinokusetyenziswa ngokuthe ngqo njengeenxalenye okanye iimveliso ngaphandle kwesidingo sokusika. Kodwa kwiukukhwabanisa okubandayo, ngenxa yeplastiki ephantsi yentsimbi, kulula ukuyiqhekeza ngexesha lokuguqulwa, kwaye ukuchasana kwe-deformation kukhulu, ngokoukwenza iitoni ezinkulukunye noomatshini bokucofa bayafuneka.