Method of manufacturing an insulator with swaged perforated flanges

A method of manufacturing an insulator from a first covering member and a second covering member, the method comprising:

• disposing the first covering member;
• disposing the second covering member on the first covering member;
• and
• swaging the first covering member with the second covering member,
• wherein the insulator comprises a tubular shape to cover an exhaust member that causes
• exhausted air from an internal combustion engine of a vehicle to flow downstream,
• wherein the first covering member and the second covering member each include a plate-shape;
• wherein the first covering member and the second covering member each include:
• a groove separating an inner side of the insulator from an outer side of the insulator;
• and
• flanges protruding outward from a side rim of the groove, the flanges including a perforated flange that includes an insertion hole to allow insertion of a pin therethrough,
• wherein the first covering member is disposed such that:
• an outer side of the groove of the first covering member is supported by a first supporting member from below;
• each of the flanges of the first covering member is supported by a base from below;
• the pin, which is retained on the base, is inserted through the insertion hole of the perforated flange of the first covering member;
• and
• the first covering member is thereby fixed in position,
• wherein the second covering member is disposed on the first covering member such that:
• an inner side of the groove of the second covering member faces an inner side of the groove of the first covering member;
• the flanges of the second covering member are individually placed on the flanges of the first covering member;
• the pin retained on the base is inserted through the insertion hole of the perforated flange of the second covering member;
• and
• the second covering member is thereby fixed in position,
• wherein the method further comprises disposing a second supporting member to cover an outer side of the groove of the second covering member from above,
• wherein the swaging is performed such that at least the perforated flange of the first covering member including the insertion hole is swaged with the perforated flange of the second covering member including the insertion hole as the pin is inserted through the first covering member and the second covering member, and
• wherein the perforated flange of the second covering member abuts the perforated flange of the first covering member.