Curling
Curling Mold
Curling refers to a process used to create a curl in which to house a pin.
How is it made in a mold?
Curling is a process used to achieve a curl, typically used as a guide for a connecting or rotating pin. Let’s examine the characteristics and potential it offers. Curling is an extreme bending process, meaning that it folds the sheet metal onto itself to create a circular passage. The generated curl becomes a seat for pins and is often used to construct hinges from sheet metal. Using bending or punching presses, the process becomes quick and flexible, allowing for length variations with a single mold.
Curling is achieved with the aid of a mold installed on a suitably powerful press. Inside the mold, the sheet metal is constrained in a seat and pushed along a winding path to achieve the desired shape, usually a circular eyelet. The recommended materials are those that are highly malleable and plastic, as the forming of the eyelet is very stressful. The thickness of the sheet metal can vary from a few tenths to several millimeters. To avoid issues with the collapse of the curl or incorrect hole dimensions, it is advisable to use sheets of constant thickness with excellent cutting profile quality. The effort required for curling is comparable to the effort required for bending the sheet metal. The machines or presses must be proportionate to this parameter.
