Method for producing an exhaust gas manifold for a multi-cylinder engine
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United States of America Patent
Stats
-
Feb 22, 2000
Issued Date -
N/A
app pub date -
Mar 2, 1998
filing date -
May 11, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
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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