Mandrel for cold drawing and/or sizing tubes

Details Mandrel for cold drawing and/or sizing tubes Mandrel for cold drawing and/or sizing tubes

1976-05-07

1977-11-15

Keenan, Michael J.

Metal deforming

By pulling workpiece through closed periphery die

Utilizing plural metal-deforming tools

72 43, 72478, B21C 124

Patent

active

040579921

ABSTRACT:
A mandrel, in particular a floating mandrel, for the cold drawing and/or sizing of tubes comprising a drawing portion and a shoulder portion section, wherein corresponding to the various functional requirements which are made of its different sections the mandrel consists of two or more different portions which are joined to form a resilient structure and comprise between them at least one intermediate space whose volume is variable by resilient deformation of the mandrel portions and/or relative movement of the mandrel portions with respect to each other, and is substantially completely sealable by engagement of the mandrel portions on the inner wall of the tube to be drawn.

REFERENCES:
patent: 2355734 (1944-08-01), Katz
patent: 2408325 (1946-09-01), Luce et al.
patent: 3783663 (1974-01-01), Pravsnar et al.
patent: 3901063 (1975-08-01), Nileshwar
patent: 3903724 (1975-09-01), Alekhin et al.

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