Metòd natirèl bòdi: metòd natirèl bòdi yo rele tou metòd la fòme roulo (CFE). Karakteristik yo nan metòd sa a bòdi se ke nan pwosesis la nan fòme, se gwoup la woulo liv configuré sou kwen an lyezon vètikal kontwole ekstansyon an kwen. An menm tan an, gwoup woulo liv yo kenbe soti deyò.
Extend the edge as a compressed deformation form to absorb, so that the forming process of the tanded steel is close to the forming method of natural bending shape. Therefore, it is a forming method that can prevent the edge extension and absorb marginal extension, which is suitable for the inhabitant medium -caliber thin wall tube (D>400mm).
