B - Operations – Transporting – 21 – B
Patent
B - Operations, Transporting
21
B
80/15
B21B 17/00 (2006.01) B21B 19/00 (2006.01) B21B 23/00 (2006.01)
Patent
CA 1179170
Abstract of the Disclosure. Disclosed is a method in which a starting material is rolled and made into a pipe by passing the material through a two-roll Mannesmann piercing mill, a three-roll mandrel elongator, a multiple-stand continuous pipe rolling mill of the mandred bar restraining type and a high-reduction sizer in this order. The sizer is arranged in succession to the exit side of the multiple-stand continuous seamless steel pipe rolling mill of the mandrel bar restraining type so that the shell being rolled by the rolling mill is gripped by the sizer which in turn withdraws the shell being rolled from the mandrel bar of the rolling mill in such a manner that a tensile stress acts on the shell extending between the rolling mill exit and the sizer entry while effecting the rolling of the shell-by the rolling mill and the rolling of the shell by the sizer simultaneously. The amounts of work shared by the piercing mill, the elongator, the rolling mill and the sizer are suitably determined in such a manner that the merits of these mills are rationally made available and combined thereby cooperative- ly ensuring high efficiency and a high degree of processing accuracy.
392402
Akita Shinji
Mihara Yutaka
Numano Masachika
Macrae & Co.
Nippon Kokan Kabushiki Kaisha
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