Methods for cold drawing seamless metal tubes each having an upset portion on each end
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United States of America Patent
Stats
-
Jun 9, 1992
Issued Date -
N/A
app pub date -
Jan 4, 1991
filing date -
Apr 16, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method of and a device for cold drawing seamless metal tubes, each tube having an upset portion on both ends. The draw bench comprises a reducing die, a die control unit, a plug control unit including a plug and a draw unit. The reducing die has an internal surface including an inlet portion which tapers rearwardly, a small diameter bearing portion and an oppositely inclined outlet portion. A plug includes a rearwardly tapered portion, a large diameter bearing portion, a forwardly tapered portion, a small diameter cylindrical portion, a rearwardly tapered portion and a large diameter cylindrical forward bearing portion. The plug control unit is mainly movable with respect to the die control unit by a pair of hydraulic units, but the control unit is also movable with respect to the plug control unit for changing a cross sectional reducing area between the reducing die and the plug.
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