Plug drawing of tubes and other hollow items

Details Plug drawing of tubes and other hollow items Plug drawing of tubes and other hollow items

1986-01-21

1987-10-06

Crane, Daniel C.

Metal deforming

By pulling workpiece through closed periphery die

Utilizing plural metal-deforming tools

72 43, B21C 124

Patent

active

046974474

ABSTRACT:
A variable-geometry plug for use in the plug drawing of tube or other elongated hollow stock. The plug comprises first and second coaxial and relatively-movable parts which co-operate with a deformable annular sealing ring. With the two parts so disposed that the ring is relaxed, the plug can be inserted easily into the undrawn stock. In use, the two parts are caused to move relative to each other, so deforming the ring that is seals an annular clearance between the plug and the undrawn stock. If lubricant is then provided at the upstream face of the seal, the movement of the stock over the seal then tends to draw that lubricant forward across the seal by hydrodynamic action, so tending to fill the clearance with that lubricant at an enhanced pressure. Plugs are described in which this hydrodynamic pressurization is augmented by fluid under pressure supplied direct to the clearance through conduits including passages formed through the body of the plug. Plugs connected to solid bars and flexible leads, and also truly "floating" plugs no such connection, are described.

REFERENCES:
patent: 2450308 (1948-09-01), Smith
patent: 3596491 (1971-08-01), Cress et al.
patent: 4057992 (1977-11-01), Willimzik

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