Metal deforming – By pulling workpiece through closed periphery die – Utilizing plural metal-deforming tools
Patent
1991-01-04
1992-06-09
Crane, Daniel C.
Metal deforming
By pulling workpiece through closed periphery die
Utilizing plural metal-deforming tools
B21C 124
Patent
active
051196620
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.
REFERENCES:
patent: 295898 (1884-04-01), Billings
patent: 565726 (1896-08-01), De Los Rice
patent: 600014 (1898-03-01), McCool
patent: 2240456 (1941-04-01), Darner
Sakurai Toshio
Sunaga Yutaka
Crane Daniel C.
Sanwa Kokan Co., Ltd.
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