The HPPL series Double-Action Parallel Flanging Mechanism refers to the flat or curved sections of the blank, which, through the action of molds, form straight walls or flanges at a certain angle along the closed or open curve edges. Flanging is a stamping process. There are many types of flanges, and the classification methods vary. They can be categorized into elongating flanges and compressing flanges based on their deformation properties.