B - Operations – Transporting – 21 – K
Patent
B - Operations, Transporting
21
K
26/155
B21K 21/00 (2006.01) B21C 23/12 (2006.01) B21C 45/00 (2006.01) B21D 9/12 (2006.01) B22D 11/057 (2006.01)
Patent
CA 1248740
ABSTRACT A method is described for the preparation of tubular copper or copper-alloy chills or ingot moulds shaped with their longitudinal axis substantially curved, and comprising a first stage in which the end of a tubular semi-finished product of rectilinear axis is turned-over by cold plastic deformation; a second stage in which said semi-finished product is shaped to give it a curved form; a third stage in which a mandrel having the same shape and outer dimensions as the chill to be obtained is then inserted into said semi-finished product; a fourth stage in which said semi-finished product is passed through an extruder die of such dimensions as to deform the material of said semi-finished product in order to cause the inner surface of said semi-finished product to adhere closely to the outer surface of said mandrel; and a fifth stage in which when said semi-finished product has passed through said die, a substantially axial force is exerted on said mandrel in the opposite direction to the force exerted in the preceding stage, while the end edge of said semi-finished product is rested against counteracting sectors disposed below said die.
457525
Lmi-La Metalli Industriale S.p.a.
Mccarthy Tetrault Llp
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