公开(公告)号：US11415031B2

公开(公告)日：2022-08-16

申请号：US16040913

申请日：2018-07-20

申请人： Bosal Emission Control Systems NV

发明人： Paul Vanleene

IPC分类号： F01N1/08 ,  B21B17/02 ,  B21D53/88 ,  B21D19/02 ,  F01N13/18 ,  B21D22/14 ,  F01N1/02 ,  B21D22/18 ,  B21D19/08 ,  F01N1/00 ,  F01N13/08

摘要： Method for forming a collar in a muffler shell including: providing a muffler shell made of a metal sheet and forming a muffler housing, the muffler shell having an exhaust gas opening, providing a collar forming head having a rotational axis and at least two movable expanders, introducing a collar forming head into a muffler housing, moving the expanders of the collar forming head introduced into the muffler shell radially away from the rotational axis of the collar forming head from a retracted position to an expanded position rotating the collar forming head around the of the collar forming head, bringing the rotating expanded collar forming head in contact with the metal sheet forming an outwardly projecting collar around the exhaust gas opening by flaring the edge of the metal sheet.