Abstract: The forming quality of workpiece can be improved effectively by arranging drawbead structure with suitable parameters. To establish reasonable principle of the drawbead structural design and take the drawbead restraining force and the subsequent performance of sheet metal passing through the drawbead as test targets, the orthogonal experimental research on the influence of semicircle drawbead structural parameters on the test targets is performed. The influence of drawbead structure upon the subsequent performance of sheet mental is discussed and the relation between the drawbead restraining force and the subsequent performance of sheet metal is analyzed. The result indicates that different combinations of the drawbead structural parameters might have similar effects on resistance, but the subsequent performance of sheet metal is not all the same. Among the drawbead structure parameters, the corner radius of drawbead has the most significant effect on the drawbead restraining force and the subsequent performance of sheet metal, while the corner radii of groove r1 and r2 have the least effect. Therefore, on the basis of experimental data and analytical results, the design principle of the drawbead structure parameters are obtained in terms of the drawbead restraining force and the subsequent performance of sheet metal. The principle of designing drawbead parameters on the basis of the forming depth of drawing parts would have a positive guidance function for the design of drawing dies of large-scale covering parts.

Key words: Drawbead, Orthogonal design, Structural parameters, Subsequent performance