COPPER TUBES MADE BY DIE AND PUNCH
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AN unusual example of the extraordinary ductility of copper was cited by Mr. B. H. Thorp, M.Sc.. A.M.I.Mech.E., mechanical engineer to
the Copper Development Association, in a lecture to members of the Engineering Society, at Leeds University, on January 30.
Describing a process used during the war to produce honeycomb radiator and oil cooler tubes by the million, he said: "A piece of copper rod about 0.4 in. in diameter and about in. long is placed in a die and a punch is driven into it, forcing the copper out through the die in the form of a tube about 3/16 in. in diameter and up to 14 ins. long, and with a wall about 6/1000 in. thick.
"The. whole operation takes rather less than one second to complete and is carried out with the copper at room temperature and without any preheating."