Method of Manufacturing a Cylindrical Housing of an Exhaust System and Method of Manufacturing...

A method of manufacturing an exhaust-gas treatment unit (10) for vehicles, comprising the steps of:

• manufacturing a cylindrical housing by
• providing a flat sheet metal part having at least one embossing, round bending the sheet-metal part in a round bending tool by displacing the sheet metal part between rolls such that the sheet metal part obtains a cylindrical shape having a longitudinal direction parallel to the roll axes of the rolls, and with at least one elastic roll being used such that the embossing of the sheet metal part is maintained during round bending, and
• connecting longitudinal edges of the sheet metal part to form a tube,
• inserting an insert into the housing which is circumferentially closed, and
• fastening covers to end faces of the housing.