For the bending process, the quality of the bending mainly depends on the two important parameters of the bending angle and size. When bending, in order to ensure the forming size and angle of the bending, it is necessary to pay attention to the following aspects.
(1) The upper and lower dies are not concentric with the knives, which will lead to errors in the bending dimensions. Before bending, the upper and lower dies should be adjusted to the center of the knives.
(2) After the rear stopper moves left and right, the relative position of the sheet and the lower die may change, which affects the bending size. The position distance of the rear stopper needs to be re-measured before bending.
(3) The parallelism between the workpiece and the lower die is not enough, which will cause the bending springback and affect the bending angle. The parallelism should be measured and adjusted before bending.
(4) When the primary bending angle is insufficient, the secondary bending will also be affected, and the accumulation of bending errors will lead to an increase in the forming size and angle errors of the workpiece, so it is particularly important to ensure the accuracy of unilateral bending.
(5) When bending, the size of the V-port of the lower die is inversely proportional to the bending pressure. When processing metal sheets of different thicknesses, it is necessary to select the appropriate V-shaped groove of the lower die according to the regulations, generally 6 to 8 times the thickness of the plate. More appropriate.
(6) When the workpiece is bent on the bending machine after the V-shaped groove is created, it is necessary to ensure that the edge of the upper die, the bottom edge of the V-shaped groove of the workpiece and the bottom edge of the V-shaped groove of the lower die are on the same vertical plane.
(7) When bending the workpiece after grooving, in order to prevent the knife from being clamped, the angle of the upper die should be controlled at about 84°.
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