After bending, the workpiece deforms at the bend
Causes: Deformation mainly occurs because the bending speed is fast, and the hand cannot keep up with the speed of the workpiece bending deformation.
Solution: Reduce the bending speed and support the workpiece while bending.
02
For longer bent workpieces, there may be a discrepancy in angles between one end being larger and the other end being smaller.
This situation generally arises from the following conditions:
(1) Inconsistent material thickness, with one end thick and the other end thin.
(2) Wear on the upper die, causing one end to have a smaller height dimension than the other.
(3) Imbalance in the middle block, not on the same level.
Solution:
(1) Provide feedback to the laser for material selection.
(2) Change the tooling.
(3) Adjust the middle block.
03
During Z-folding, the workpiece may deform at times.
Causes: This situation mainly occurs because point C serves as the rear fixed positioning. When bending at point B, the workpiece bends upward, hits the rear fixed positioning, and gets squeezed by it. After bending, point D gets deformed.
Solution: Use the rear fixed positioning pull-back function.
04
For small bending dimensions that are difficult to position, the upper die easily presses onto the rear fixed positioning.
Causes: With t=0.8, following the principle of selecting the lower die, v=5×0.8=4mm. The distance from the center to the edge of 4v is 3.5mm, and the internal dimension within 2.9mm is 2.9-0.8=2.1mm. The bending dimension falls within the distance from the centerline to the edge of v, making proper positioning impossible. Using the upper die in reverse or normal mode results in the upper die pressing onto the rear fixed positioning, rendering both methods ineffective, necessitating alternative solutions.
Solution:
1. Use the lower die in reverse. Place a thin shim in front of the rear fixed positioning to allow it to retract, avoiding contact with the upper die.
05
There is a square hole in the middle of the sheet metal, with the edges of the square hole very close to the bending line. If bent directly, the material near the square hole to the bending line will not fold.
Causes: Due to the dimension at point B being only 1.3mm, with a material thickness of 0.8mm and a selected v width of 4v. Since 1.3mm < 4v/2, folding is not possible.
Solution:
(1) Flatten the material at the bending line.
(2) Score the bending line first, then fold.
06
There are holes on the workpiece, with the holes very close to the bending line. If bent directly, the holes will deform.
Solution:
(1) Score the bending line before folding.
(2) Use a laser to cut the line at the bending line to prevent material pulling.
(3) If the production quantity is low and aesthetics are important, use the LASER to cut small holes first, then bend, and finally enlarge the holes.
