Method and tool for formation of an enlarged end portion of a bar
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United States of America Patent
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-
Dec 4, 2001
Grant Date -
N/A
app pub date -
Sep 27, 2000
filing date -
Feb 3, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and apparatus for the formation of an enlarged end portion of a bar (48) by upset forging. Before upsetting, the bar end portion (46) is heated to a forging temperature and passed through a passage (40) of a form part (2,4) and into a cavity (44) with increased cross-sectional area which is defined by the form part (2,4). The portion of the cavity (44) which is located opposite the passage (40) is defined by wall (42) with a shape corresponding to the cavity's (44) cross section. For the formation of the enlarged end portion, the wall (42) is pressed against the end of the bar and upsets the bar end portion until the bar material fills the cavity (44). According to the method a bar portion which is located in the passage (40) is also heated to forging temperature, and the form part (2,4) is moved simultaneously with the wall (42), whereby this bar portion (48) is successively fed into the cavity (44) during the upsetting process.
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