JPS5659508A - Rolling method for thick plate - Google Patents

Abstract

PURPOSE: To prevent the shock of biting the material, by subjecting the material to the forming pass and the broadside rolling pass so as to make both ends of the material thicker than its middle zone through the respective final pass in above- stated two rolling passes, and by forming the bulged ear in the corner of the material through the shaping pass.

CONSTITUTION: The blank material 1 is successively rolled by the forming pass I, the broadside rolling pass II, and the shaping pass III; in the forming pass I, the front and the rear end parts 5a of the rolled material 5 are made gradually thicker toward the front and the rear ends, and the middle zone 5b is formed into uniform thickness. In the broadside rolling pass II, both side edges 6a of the rolled material 6 are made thicker toward the side edges, and its middle zone 6b is formed into uniform thickness. Hereupon, because the thickness of the front and the rear end parts 5a is made thick in the forming pass I, the bulged ear 6c is formed in each corner. In the final shaping pass III, because the material 7 is rolled into uniform thickness, each corner considerably largely bulges further to form the bulged ear 7a. This bulged ear 7a prevents the shock of biting the material.

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