Covering die for silencer of automotive exhaust system

The utility model discloses a covering die for a silencer of an automotive exhaust system. The covering die comprises two sets of positioning cores and track disks. An end cover positioning core used for positioning the position, with a flanged hole, of the end face of an end cover is fixed in each positioning core, and an inner core assembly positioning core used for positioning the end face of a silencer inner core assembly in the flanged hole is fixed in each positioning core; one end of each end cover positioning core is fixed in the corresponding positioning core, and the other end of each end cover positioning core is provided with a round groove; one end of each inner core assembly positioning core is fixed in the corresponding round groove, and the other end of each inner core assembly positioning core is inserted in the corresponding inner core assembly; the vertical distance from the end face, making contact with the corresponding inner core assembly, of each inner core assembly positioning core to the end face of the end, provided with the round groove, of the corresponding end cover positioning core is 0.5 mm to 2.5 mm larger than the length of the turned edge of the corresponding end cover flanged hole. According to the covering die for the silencer of the automotive exhaust system, the end cover positioning cores and the inner core assembly positioning cores are combined for action, so that the length of the portion, stretching out of the corresponding end cover, of each inner core assembly ranges from 0.5 mm to 2.5 mm, and the quality of welding among the inner core assemblies, the end cover and an exhaust system gas inflow pipe is guaranteed. The covering die is suitable for covering the silencer of the automotive exhaust system.