|
Determination of the Flat Pattern Length by Specifying Bend Reduction |
Scroll |
The flat pattern length of the cylindrical part of the bend l is calculated according to a formula:
l = 2 · a - BD, where
BD (an abbreviation for Bend Deduction) — is the bend reduction, specified by the user;
a is a geometric parameter of the bend which is automatically defined by the system (see Table).
Defining the parameter a for different bend angles α
α<90° |
α>90° |
||
|
|
|
|
a = (R + S) · tg(α/2) |
a = (R + S) |
||
The full length of the flat pattern L when flattened is calculated according to a formula:
L = A' + B' – BD.
|
|
a) |
b) |
Bend unfolding: a) bend is folded, b) bend is unfolded
|
For bend angles α>90°, the bend deduction value BD may be negative. |
