| 摘要 |
<p>Provided is a multi-roll mandrel mill in which "compacting of roll chock portions" is achieved, a plurality of grooved roll bodies is included as a roll pass which performs the reduction rolling of a shell, and a plurality of roll stands each having backup rolls for driving the grooved roll bodies are included, wherein bearings are internally contained in the grooved roll body. A multi-roll mandrel mill in which "optimizing the design of roll chock portions etc. for every setup" is achieved is a mandrel mill provided with a plurality of grooved roll bodies as a roll pass which performs the reduction rolling of a shell and a plurality of roll stands each having roll shafts and roll chock portions for driving the grooved roll bodies, wherein according to a tube-making setup of the mandrel mill, at least one of either or both of the roll shafts and the roll chock portions is replaced with a part(s) having a different shape(s) in addition to the grooved roll bodies. Both cases are elongation rolling mills effective in preventing underfill and overfill.</p> |
