Naturlig støbemetode: Naturlig støbemetode kaldes også rulleformningsmetoden (CFE). Karakteristikaene ved denne støbemetode er, at rullegruppen i dannelsesprocessen konfigureres langs den lodrette bindingskant for at styre kantforlængelsen. Samtidig er rullegrupperne fastholdt udefra.
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>400 mm).
