B - Operations – Transporting – 21 – B
Patent
B - Operations, Transporting
21
B
B21B 17/04 (2006.01) B21B 21/02 (2006.01) B21B 25/00 (2006.01)
Patent
CA 2550913
In the cold rolling process by pilger rolling that holds a mandrel between each of paired roll-dies, by optimizing the side relief rate SR and the mandrel factors like the taper 81 in the primary deformation zone of the mandrel and the taper .theta.2 in the final size reduction zone thereof, and the feed rate F of the workpiece material, and at the same time by properly adjusting the relationship between the side relief rate SR and the feed rate F, the dimension-related shape characteristics (near-perfect round shape) of the tube inside surface after the final finishing rolling process by pilger rolling can be ascertained to thereby ensure excellent surface property without requiring a new apparatus, and further without causing the decrease of the product yield and/or the increase of the manufacturing costs. Thus, this can be widely applied for producing steam generator tubes which exhibits high S/N ratio in the inner coil eddy current testing.
Ono Toshihide
Tsuyuguchi Satoshi
Gowling Lafleur Henderson Llp
Sumitomo Metal Industries Ltd.
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