Patent ID: 9636724
Date: 2017-05-02
CPC Classifications: B21B

Claim:
1. A method for rolling a Z-section sheet pile having a first flange, a second flange, which is substantially parallel to said first flange, an inclined web, a first corner joining said web to said first flange, a second corner joining said web to said second flange, wherein each of said corners has an opening angle a greater than 90°; wherein said method comprises the steps of: rolling a precursor of said Z-section sheet pile with a curved precursor of said web in successive roll gaps defined by at least one roll pair comprising a grooved upper roll and a grooved lower roll, wherein: subsequently straightening said curved precursor of said web by introducing said precursor of said Z-section sheet pile between an upper straightening roll and a lower straightening roll; wherein: at least in the roll gaps that finish forming said curved precursor of said web, said lower roll has a diameter that decreases in a discontinuous manner in an interval between said first groove in said upper roll and said first groove in said lower roll, and said upper roll has a diameter that increases in said interval in a complementary manner.