### Bending accurate calculation formula and coefficient

#### 1. The iron plate bending for 90 degree. The upper mold R0.5 is normally bent, the lower die V = 5T, the bending coefficient is 0.4T, and the V groove is V = 5T + R (R> 0. Expanded size = L1 + L2-2T + factor  Remarks:  The material will not be pulled when the edge of the 2.5 / SGCC hole to the inner bend is 3.8mm.

#### 2.The iron plate bending for 60 degree (using the lower die) Expanded size = L1 + L2 + coefficient #### 3.The iron plate bending for 30 degree (using the lower die) Expanded size = L1 + L2 + coefficient #### 4. The aluminum plate bending for 90 degree, the upper die is normally bent R0.5, the lower die is V = 5T, and the bending coefficient is 0.4T. Expanded size = L1 + L2-2T + factor  #### 5. Aluminum plate bending for 60 degree (using the lower die) Expanded size = L1 + L2 + coefficient #### 6. The aluminum plate bending for 30 degree (using the lower die) Expanded size = L1 + L2 + coefficient #### 7. Flattening coefficient (first insert the lower die to fold a small angle, and then use the flattening die to press the dead edge) Above: Expanded size = L1 + L2-0.55T Above: Expanded size = L1 + L2-0.55T + 0.7W (W≤T) Above: Expanded size = L1 + L2 + 3.14 * (R + m) (2R> T)
T≤2.0, m = 0.4T;
2.0 <T≤3.2, m = 0.3T.
Coefficient of differential pressure 1. When W≥2T: unfolding is calculated based on two single folds;
2. When W <2T, H≥2T: the expansion is calculated based on two single folds;
3. When W <2T, H <2T: Expanded size = L + (H-T) * 0.7;
4. When W <2T, H = T: Expanded size = L + 0.15T.

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