Sheet Metal Bending

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The working principle of sheet metal bending forming is to fix the upper and lower molds on the upper and lower worktables of the bending machine respectively, and use the servo motor to transmit the relative motion of the hydraulically driven worktable, combined with the shape of the upper and lower molds, thus Realize sheet metal bending and forming of sheet metal. with the addition of CNC function and into various angles, advanced sheet metal bending service improved fabrication accuracy and production efficiency are effectively.

The forming accuracy of the bending can reach 0.1mm per fold.Common bending forming: Usually, the forming that we can complete with a bending machine includes 90-degree bending, non-90-degree bending, dead edge (including a gap less than the thickness of the plate), level difference, etc.

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The Case & Products Of Sheet Metal Bending

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The Types Of Sheet Metal Bending Moulds

When bending two adjacent folded edges, if there is a hemming relationship between each other, a process hole (the diameter of the process hole is not less than the thickness of the plate) should be considered in the corner of the bending, and a reasonable gap (0.15 times the thickness of the plate) should be reserved. sheet thickness).

The minimum distance from the hole to the edge of the bending part. Usually, we take down 1/2+0.5 of the width of the die groove (as shown in the figure on the right). When designing sheet metal parts, try to avoid the occurrence of folded edges or hole spacing. When the edge distance is less than the size requirement

The width of the lower die groove is determined according to the plate thickness (T), as shown in the table:

Sheet Metal Bending Design Requirement

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Sheet Metal Bending is limited by the mold, and there are requirements for the minimum bending height. The specific requirements are shown in Table 1 in Figure 1:

The above analysis is based on the case where only one-knife bending is performed. For parts whose bending direction of the second knife is inconsistent with that of the first knife, the minimum bending height C as shown in the figure below, the height of C is (V groove/2+t+4) mm (V groove is the width of the bending die groove, t is the material thickness, unit: mm)

The Minimum V-groove Selected For Different Material Thicknesses In Cnc Die Bending

Punching dies and blanking dies require a reasonable gap between the punch and the die, and the gap is generally 5% to 10% of the plate thickness. Using a punching die with a diameter of 50mm to produce a blanking part with a diameter of 50mm cannot guarantee the accuracy of the stamping part, because the size of the hole on the workpiece depends on the size of the punch, and the outer dimension depends on the size of the die.

Schematic Diagram Of The Second Knife Bending

For the concave and U-shaped bending parts shown in Figure 2, the angle a should generally be followed by not more than 45°. The bending shape shown in Figure 3 is suitable for parts with material thickness ≤ 2 mm, and the size requirements are shown in Table 2.

The CNC bending of sheet metal parts with a thickness of t=8.0 is limited by the mold, and there are requirements for the minimum bending height and bending fillet. The requirements are as follows (Table 3):