Patent ID: 7421873

Claim:
A rolling apparatus comprising a single first work roll and a single second work roll cooperative with the first work roll for rolling a metal blank plate to manufacture a metal product of miscellaneous cross section comprising a plate portion and a plurality of ridges projecting upright from only one side of the plate portion integrally therewith and spaced from one another, the first work roll having a plurality of ridge forming annular grooves formed in a peripheral surface of the first work roll over an entire circumference of the peripheral surface of the first work roll and arranged at a spacing axially of the first work roll, a portion of a peripheral surface of the second work roll other than axial opposite end portions thereof is in the form of a cylindrical surface, a bottom face of a deepest of all the ridge forming annular grooves in the first work roll having a diameter not smaller than a diameter of the cylindrical surface of the second work roll, the two work rolls being rotatable at a same number of revolutions so that a peripheral speed of the bottom face of the deepest of all the ridge forming annular grooves in the first work roll is not smaller than a peripheral speed of the cylindrical surface of the second work roll.