metallide lehtvormimise vormimisoperatsioon, mille korral tasapinnaline toorik deformeeritakse (tõmmatakse) suure sügavusega (sügavus diameetrist suurem) ruumiliseks õõneskehaks; eriliikideks on õhend, forming deeply recessed parts by forcing sheet metal to undergo plastic flow between dies, usually without thinning of the sheet; an operation can be performed without or through reduction of wall thi