Optimization of the Forming Method on Torsion Defect in Cold-Roll Forming of Z Section Steel

The knurling design is the basis of cold-roll forming, which is related to the subsequent roll design. It is also the basis to determine the roll pass. As a typical cross-section, Z-shaped steel is widely used in automobile, household appliance manufacturing, and building structure installation. However, torsion defects often occur in the cold-roll forming of Z-shaped steel, resulting in unqualified products that are unusable. The web deflection angle is a typical factor to affect the torsion defects in the cold-roll forming of Z-shaped steel. Therefore, it is necessary to discuss the influence of web deflection on the torsion of the Z-shaped steel. The web deflection angle optimized is determined by the result. According to the theoretical calculation, the best antitorsion angle is 32°, and the conjecture is proved by experiments. Also, we obtain the forming method optimized with the least torsion. This study could provide some guidance for the design of the process flow of cold-formed Z-beam.