Process for cold-forming a tube having a thick-walled end portio

Details Process for cold-forming a tube having a thick-walled end portio Process for cold-forming a tube having a thick-walled end portio

1980-07-16

1984-06-19

Larson, Lowell A.

Metal deforming

Process

Tube making or reshaping

72343, B21K 2108

Patent

active

044547455

ABSTRACT:
A tube with a thick walled portion at one end is cold-formed by necking one end of a tube workpiece, inserting a mandrel which engages within the tapering neck of the necked portion, drawing the necked workpiece through a drawing die by applying pressure on the mandrel, and withdrawing the mandrel from the workpiece. A thick-walled portion may be formed at the opposite end by interrupting the drawing operation, inserting a second mandrel of smaller diameter with a shoulder engaging in the tapering neck of the workpiece, continuing the drawing to draw the remainder of the workpiece down onto the second mandrel, and withdrawing the second mandrel.

REFERENCES:
patent: 1945080 (1934-01-01), Thoms
patent: 2506657 (1950-05-01), Webster
patent: 2917823 (1959-12-01), Fletcher
patent: 3292408 (1966-12-01), Hill
patent: 3807213 (1974-04-01), Willis et al.
patent: 3837205 (1974-09-01), Simon
patent: 3886649 (1975-06-01), Simon
patent: 3948073 (1976-04-01), Lovell
patent: 4292831 (1981-10-01), Simon

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