초록 ▼

A manufacturing method for a muffler includes: a trimming step, of cutting out a dogleg shaped muffler body member; a bending processing step of processing the muffler body member into a tube by advancing the muffler body member between an upper roller and a lower roller of a bending machine while a

A manufacturing method for a muffler includes: a trimming step, of cutting out a dogleg shaped muffler body member; a bending processing step of processing the muffler body member into a tube by advancing the muffler body member between an upper roller and a lower roller of a bending machine while adjusting an advancing direction with a guide and by changing a relative position of the upper roller and the lower roller; a first joining step of joining two ends of the tubularly-processed muffler body member in a long side direction; an insertion step of inserting an inner structural member into the inside of the tubularly-processed muffler body member; a second joining step of joining caps to opening portions of the tubularly-processed muffler body member; and a third joining step of joining an air intake joint and an exhaust pipe to the sealed muffler body member.

대표청구항 ▼

1. A manufacturing method for a muffler comprising: a trimming step of cutting out a dogleg shaped muffler body member from a planar plate, the dogleg shaped muffler body member defining a first part and a second part and a bending portion between the first part and the second part, wherein a length

1. A manufacturing method for a muffler comprising: a trimming step of cutting out a dogleg shaped muffler body member from a planar plate, the dogleg shaped muffler body member defining a first part and a second part and a bending portion between the first part and the second part, wherein a length of the bending portion of one side of the dogleg shaped muffler body member is different than a length of an opposing side of the bending portion of the dogleg muffler body member;a bending processing step of processing the muffler body member into a tube by advancing the muffler body member between an upper roller and a lower roller of a bending machine while adjusting an advancing direction with a guide and by changing a relative position of the upper roller and the lower roller, thereby producing a tubularly-processed muffler body member;a first joining step of joining two ends of the tubularly-processed muffler body member in a long side direction of the dogleg shaped muffler body member;an insertion step of inserting an inner structural member to the inside of the tubularly-processed muffler body member;a second joining step of joining caps to opening portions of the tubularly-processed muffler body member to seal the tubularly-processed muffler body member; anda third joining step of joining an air intake joint and an exhaust pipe to the sealed muffler body member. 2. The manufacturing method according to claim 1, wherein in the first and second joining steps, a swaging process is used to join the two ends of the tubularly-processed muffler body member and join the caps to the opening portions of the tubularly-processed muffler body member.