Abstract: The causes of the longitudinal cutting burr of cold rolled silicon steel CS unit were described, on which the influences of the factors such as the side clearance, overlap, precision and edge state of the cutting edge, and the accuracy of the longitudinal shearing machine were analyzed. Then the treatment method of dealing with the longitudinal cutting burr error was put forward, that was applying a designed new burr cleaning device. The practice showed that the finished product burr of cold rolled silicon steel has been successfully controlled in less than 0.01 mm by using the new device, which can satisfy  customers' requirements, and make great reference to improve the shear quality and the yield. 

Key words: silicon steel, burr, longitudinal cutting, side clearance, overlap