Bending is a stamping process that uses pressure to force a material to plastically deform to form a shape with a certain angle and curvature. Commonly used bending includes V-shaped bending, Z-shaped bending and back pressure bending.

## 8 Factors Affecting Bend Size and Angle

- The different cores of the upper and lower molds will lead to the deviation of the bending size, and the knife should be in place.
- After the back gauge moves left and right, the relative distance to the lower die changes. It can be fine-tuned by the back gauge screw after measuring with a vernier caliper.
- When bending, the parallelism between the workpiece and the lower die is not enough, and the workpiece rebounds after the upper die are pressed down, which affects the bending size.
- When the primary bending angle is not enough, the secondary bending size will be affected.
- The cumulative error of bending will lead to an increase in the size error of the workpiece. Therefore, it is particularly important to ensure the accuracy of unilateral bending.
- Material characteristics and thickness will affect the bending angle, so each workpiece must be checked first and strengthened by sampling.
- The length and thickness of the workpiece require different pressures, and the length and thickness of the sheet are proportional to the pressure. Therefore, the bending pressure must be readjusted when the length and thickness of the workpiece change.
- The size of the V-port of the lower die is inversely proportional to the bending pressure. When the length and thickness of the sheet are constant, the larger the V-notch, the smaller the pressure required. Therefore, when machining workpieces of different thicknesses, the correct V-notch of the lower die should be used as specified. size. The current regulations are as follows, and no one may change them at will.

## Sheet Metal Bend Radius and Thickness

The sheet bending radius is a value required in sheet drawing, and it is difficult to determine its size in actual processing. In fact, the bending radius of the metal sheet is related to the thickness of the material, the pressure of the bending machine, and the width of the die groove under the bending die. How to determine the bending radius of sheet metal? What does it have to do with the thickness of the plate?

### Bending Radius and Sheet Thickness

- Experience in sheet metal processing shows that when the thickness of the sheet is not greater than 6 mm, the inner radius of the sheet bending can be directly determined by the thickness of the sheet.
- When the bending radius is R=0.5, the average thickness of gold is T=0.5mm. If the radius size is larger or smaller than the plate thickness, special tooling is required.
- When the metal plate is required to be bent by 90° and the bending radius is particularly small, the gold should be planned first. It can also process the upper and lower molds of special bending machine molds.