Method for preparing a tubular blank having a thick wall for a f

Details Method for preparing a tubular blank having a thick wall for a f Method for preparing a tubular blank having a thick wall for a f

1994-08-19

1996-07-09

Crane, Daniel C.

Metal deforming

By pulling workpiece through closed periphery die

Utilizing plural metal-deforming tools

B21C 124

Patent

active

055333761

ABSTRACT:
A tubular blank formed by casting or extrusion or the like and having a relatively thick wall is prepared for a following drawing operation, such as a tandem or cascade drawing, by widening one end of the tubular blank with a shackled mandrel. Then the widened or distended section is stretched by a cooperative, external stretching action between the shackled mandrel and a draw plate to form a stretched section. Then, the stretched section is passed through a draw plate that may be the same or a different draw plate than the first mentioned draw plate, and then drawing over the shackled mandrel to provide the required reduced wall thickness for the following tandem drawing.

REFERENCES:
patent: 2535339 (1950-12-01), Woeller
patent: 3812702 (1974-05-01), Benteler
KRAFT- UND ARBEITSBEDARF BILDSAMER FORMGEBUNGSVERFAHREN by Arno Hensel et al., 12. Ziehen und Ziehwalzen (1 page) Nov. 1982.

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