| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for manufacturing a vehicular muffler capable of preventing radiation noise caused by pressure pulsation of exhaust gas by improving stiffness of a shell by forming a flat part without using liquid pressure bulge forming and materializing cost reduction by reducing labor and time for manufacturing. SOLUTION: This method for manufacturing the vehicular muffler provided with the flat part 4 bulging in inside and outside direction on the shell 2 of the muffler main body 1 is provided with a process for providing a preformed member 8 by pressing the flat part 4 (flat part 20) of the shell 2 to be manufactured on a metal flat plate 9 beforehand, a process for providing the shell by forming the preformed member 8 in a cylindrical shape, and a process for forming pipe connection parts 5, 6 by spinning both end parts of the shell 2 and reducing the diameter. COPYRIGHT: (C)2007,JPO&INPIT
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