Stretch forming

The stretch forming or depths is a manufacturing method of the main group forming , is according to DIN 8585, together with the lengths and widths for forming under tensile conditions and can be roughly divided into two process variants:

1. In the case of simple stretch drawing , the sheet metal is clamped in axially rotatable clamping devices and then reshaped with a punch that has the inner shape of the sheet metal component as its outer shape. The method can also be used with two or four-sided clamping.
2. Another variant is tangential stretch drawing . Here the workpiece is first stretched to the flow limit . Then the sheet metal is applied to the punch with a circular movement of the clamping. The process is divided into tensile and bending deformation. The sequence of movements for stretching and bending can be combined so that bending and pulling take place simultaneously. Undercuts can be formed through the clamping path, which is guided in at least two directions .

application

The method of stretch forming are used for large components of the aircraft and aerospace industry and the automotive industry applied. The simple and inexpensive design of the stretch forming tools allows the stretch forming process to be used for small and medium quantities. The disadvantage of the low drawing depth of this process is eliminated by combining it with deep drawing .