Method for detecting shape failure in steel sheet pile rolling, manufacturing method of steel sheet pile, and steel sheet pile mill

摘要

Problem to be solved: to provide a method of manufacturing a steel sheet pile capable of suppressing occurrence of a shape defect such as wave or slip pattern.Solution: when the material is heated, a rolling path by a hole type is repeated a plurality of times, and a steel sheet pile of a predetermined shape is formed, a torque measuring device is disposed on at least one rolling mill, and the specific rolling path is released from the time of the bite of the material. The rolling torque generated at least one of the upper and lower rolls constituting the hole type is continuously measured to determine the time change of the rolling torque of the rolling path.Then, the amplitude of the rolling torque is calculated based on the change in the time of the rolling torque, and the presence or absence of the shape defect in the rolling path is determined by the calculation device.In the case of defective shape, the vibration period of the rolling torque and the average value of the rolling torque of the upper and lower rolls are calculated, and the type of the shape failure such as wave or slip pattern, and the occurrence site are judged, and based on the decision, the Change or change the rolling condition of the rolling path after the material or the next material.Diagram