It is known that wire is influenced in strength if it is wound into a coil having a too small diameter. In the present report, not only the effects of coiling on the wire strength but also on the deformation of the coiled bundle are discussed. The materials used were hard copper and some of the copper alloy wires of high elasticities. The results reveal the following points:
(1) For hard copper wire, the coiling diameter should be more than 150 to 200 times the diameter of wire about 1 mm diameter, more than 110 to 150 times the diameter of 1 to 5 mm diameter wire.
(2) For avoid the twisting of wire bundles, the diameter of the take-up drum (spool) should be less than the free forming diameter of the coiled wire.
(Received September 26, 1960)
* Partly given at the B Lecture Meeting of the 36th Tokyo Meeting of the Nippon Kinzoku Gakkai (Japan Institute of Metals) in 1955.
** The Nikko Copper Works of the Furukawa Electric Co., Ltd.
© 2002 The Japan Institute of Metals
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