Method of cold drawing seamless metal tubes each having an upset

Details Method of cold drawing seamless metal tubes each having an upset Method of cold drawing seamless metal tubes each having an upset

1986-05-01

1988-02-23

Crane, Daniel C.

Metal deforming

By pulling workpiece through closed periphery die

Utilizing plural metal-deforming tools

72285, 72276, B21C 124

Patent

active

047262117

ABSTRACT:
A method of cold drawing seamless metal tubes each having an upset portion on each end. A draw bench used for carrying out the method of this invention comprises a die control device, a plug control device including a plug having large and small diameter bearing portions and a draw unit. The die control device and the plug control device are movable with each other for changing a cross sectional reducing area between the reducing die and the plug. The method is characterized in that the cross sectional reducing area between the reducing die and the plug is preferably changed in accordance with the desired forms of a mother tube to be drawn by longitudinally transferring the reducing die and the plug and fixing them at the selected positions.

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

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