Convex hull is a stamping process that relies on the extension of materials to make sheet metal parts form local depression or bulge. Convex hull and deep drawing are completely different stamping processes. The change of material thickness in convex hull is unintentional, that is, a small amount of change in thickness is naturally formed in the deformation process, not required by the design. Convex hull is also known as undulation forming. Convex hull is a common feature in sheet metal parts. The longer convex hull can be used as a reinforcing rib to improve the strength of the part and reduce the deformation of the part. In addition, the convex hull can be used to obtain the characteristics of different height from the sheet metal datum plane, and the bridge shaped convex hull can also be used as a buckle to fix the part.

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