Method for attachment of winglets on base material for producing winglet tube for e.g. exhaust gas heat exchanger in internal combustion engine, involves embossing winglets into base material by using extrusion process

摘要

The method involves providing a winglet tube with winglet structures (2) including internally aligned individual winglets (1), where the winglets exhibit length of 7 mm. The winglets are embossed into a base material (3) i.e. aluminum, by using an extrusion process. The base material in a region of the winglets is loaded using a punch and a die plate over a flow limit. A portion of the base material is pressed in recesses of the die plate, where the portion of the base material serves as a negative form of the winglets. An independent claim is also included for a winglet tube comprising winglet structures.