Method for producing an exhaust gas manifold for a multi-cylinde

Details Method for producing an exhaust gas manifold for a multi-cylinde Method for producing an exhaust gas manifold for a multi-cylinde

1998-03-02

2000-02-22

Cuda, Irene

Metal working

Method of mechanical manufacture

Muffler, manifold or exhaust pipe making

29890148, B23D 3900

Patent

active

060265701

ABSTRACT:
A tube junction is produced having at least two inlets and an outlet, and at least one bend between the two inlets by providing a forging die with a first recess contoured to hold a bent tube piece. A second recess opens into the first recess and, terminates in a moveable counterpunch. A tube piece having two inlets is bent to bring the two inlets into positions relative to each other generally similar to relative positions of the inlets in a finished tube junction. The bent tube piece is placed within the forging die, and pressurized internally to bulge the tube piece wall into the second recess and form a neck for the outlet. Motion of the counterpunch away from the first recess is controlled as the neck forms under pressure in the second recess.

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