A: length of straight side (A 1, two sides A2).
R: the size of R when bending.
T: material thickness.
P: coefficient of flexural expansion.
W: internal r bending angle π:3. 14 16.
Then: the expanded length after expansion is l = a1+a2+w/360 * 2 * 3.1416 * r * p.
Extended data:
As a mold designer, mold design should not only consider the structure required by customers' drawings, but also meet the dimensional tolerance requirements required by customers' drawings, that is, the accuracy should also meet customers' needs. The most difficult thing to guarantee and test mold designer here is the accuracy of stamping, bending and unfolding related dimensions.
The expansion coefficient of stamping and bending is an experienced mold designer. According to the data repeatedly verified and summarized by many years of design experience, the mold designer can directly insert the calculation formula in the later stage to get the size of the unfolded plate of the bending structure. Based on this point, the expansion coefficient of stamping bending is summarized for die designers to calculate the expansion size, which can be used by any die designer
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