| ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ KAWASAKI STEEL TECHNICAL REPORT No.4 ( December 1981 ) Special Issue on Steel Pipe ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ |
| Steel Sheet Deformation Behavior and Forming Load Determination in the 26-inch Cage Forming ERW Pipe Mill
Eiichi Yokoyama, Takaaki Toyooka, Akio Ejima, Yuzo Yoshimoto, Takao Kawate, Kazuyoshi Kuwata |
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Synopsis : Behavior of steel sheet deformation as expressed in strain history, projection trace and forming flowers, and methods of determining forming load as fin pass rolls and squeeze rolls have been investigated in the 26 in. cage forming ERW pipe mill. For the longitudinal strain of the sheet edge, only a gentle deformation is observed in the cage forming zone, while a considerably rapid deformation consisting mainly of tension and including compression is noticed at the time when the sheet passes through each fin pass roll. The local increase in wall thickness around the sheet edge is caused mainly by No.1 fin pass roll forming. On the contrary, almost uniform compressive deformation is conducted by No.2 fin pass roll forming. The forming load, which depends strongly on the strength and wall thickness of sheet, can be expressed by the summation of forces which are necessary for the circumferential reduction and the bending of sheet. |
| TextiPDF: 12p./490kbj |