Simple straight line bending will exhibit springback produce a simple 90 degree bend in any given sheet metal thickness of any grade and springback will occur.
How to avoid spring back for sheet metal.
Take for example a part to be formed in a die where the product s end state is flat geometry.
Bending is one of the most frequent actions done to metal in press brake operation.
To determine the actual radius ar you get after springback multiply sf by the original inside bend radius that is the expected or planned radius before the metal springs back.
This type of springback problem is easily adjusted for by adding simple over bend or compensation.
The method is to apply the tangential tension when the sheet metal is bent change the stress state and distribution inside the sheet metal and make the whole section within the scope of plastic tensile deformation.
When compensating for spring back in materials such as stainless steel coining is typically not the best option unless you are working with thin gauges.
Stretch forming is often a more effective solution to springback problems than direct compensation.
Let s say you have a 90 degree bending angle and the material springs back 2 degrees to an 88 degree bent angle complementary.
Springback is how the sheet metal tries to revert back into its straight form once it is bent.
Springback is known as the reaction when.
The formation of sheet metal requires elastic plastic bending and stretching of the metal which contributes to springback.
Instead bottom bending can be preferable offering a higher degree of control however even this can prove a challenge.
The required tonnage is often prohibitive.
However for membrane or combined modes of springback this is not always realistic.
Due to the fact the sheet metal work hardens during forming drawing it is desirable to stretch a sheet metal part as much as possible to increase part strength and thereby increase the rigidness of the part and lessen the effect of springback.
