MUFFLER PRODUCTION METHOD AND MUFFLER

PROBLEM TO BE SOLVED: To produce a muffler easily mounted on a vehicle body with simple steps.SOLUTION: The present muffler production method comprises: a raw material trimming step S1 for cutting out a chevron shaped muffler body member; a bending processing step S2 for making the muffler body member advance between the upper and lower side rollers of a bending processing machine while adjusting an advance direction by a guide, and changing relative position of the upper and lower side rollers for processing the muffler body member into a cylindrical shape; a first joint step S3 for jointing two ends of the cylindrical muffler body member in the long side direction; an inner structure member insertion step S4 for inserting an inner structure member into the inside of the cylindrical muffler body member; a second joint step S5 for jointing a lid to an opening of the cylindrical muffler body member; and a third joint step S6 for jointing a suction joint and an exhaust pipe to the sealed muffler body member. 【課題】車体への搭載が容易なマフラーを簡易な工程で製造する。【解決手段】マフラー製造方法は、くの字型のマフラーボディ部材を切り出す材料トリミング工程Ｓ１と、曲げ加工機の上側ローラと下側ローラとの間に、ガイドによって進入方向を調整しながらマフラーボディ部材を進入させ、上側ローラと前記下側ローラの相対位置を変化させてマフラーボディ部材を筒状に加工する曲げ加工工程Ｓ２と、筒状のマフラーボディ部材の長辺方向の２つの端部を接合する第１の接合工程Ｓ３と、筒状のマフラーボディ部材の内部に内部構造部材を挿入する内部構造部材挿入工程Ｓ４と、筒状のマフラーボディ部材の開口部にフタを接合する第２の接合工程Ｓ５と、封止されたマフラーボディ部材に吸気ジョイントと排気パイプとを接合する第３の接合工程Ｓ６と、を有する。【選択図】図４