How to reduce material during sheet metal unfolding.

The bending coefficient is the length of the plate after bending. Different materials, different thickness plates and different bending dies have different bending coefficients. The expansion coefficient of bending is an experienced mold designer. According to many years' design experience, it is a data-based thing summarized through repeated verification. In the future, mold designer can be directly fitted into the calculation formula, and the expanded plate size of the bending structure can be obtained.

The general method of reducing material by bending and unfolding is to fold a bend and reduce two material thicknesses, that is, reduce one plate thickness on each side.

The die unfolding algorithm is to calculate the bending unfolding size by using the stamping unfolding coefficient, and the calculation formula is as follows:

A: length of straight side (A 1 and A2 on both sides of A2) R: size of R when bending T: material thickness P: expansion coefficient W when bending: bending angle π of internal R: 3.1416.

Then: the expanded length after expansion is l = a1+a2+w/360 * 2 * 3.1416 * r * p.

Related terms: expansion coefficient of aluminum veneer, bending expansion coefficient