Problems that can occur during sheet metal bending
TOO SHORT ARM LENGTH / TOO SHORT BEND
If the bending arm is too short, one side of the sheet metal part will not be placed on the bending tool. Thus, the metal part cannot be produced. The same applies if two Z-shaped bends are too close to each other.
Solution: The arm must be extended, or the Z-shaped bends must be moved. Since the minimum arm length depends on the tool used, the current value must be checked according to the matrix size and sheet thickness in the 90° iron bending table, which can be found here.
Sheet with Short Bends
The part cannot be manufactured
Short Z-bend
The part cannot be manufactured
Sheet with Short Bends
The part cannot be manufactured
U-PROFILE / BOX
U-profiles or boxes with sides that are too long relative to the base sometimes cannot be manufactured. The component’s sides collide with the tool during bending, or with larger constructions, with the bending machine. Special tools exist that allow slightly longer sides to be produced. Collision with the tool or machine is a typical issue when producing closed profiles.
Solution: If possible, shorten the profile arm — shortening just one is sufficient. If the longer arm is bent first, it will not collide with the tool during bending. Instead of shortening the foot, the base can also be extended.
Conflict with the Ram
The part cannot be manufactured
Bending U-profile
The part cannot be manufactured
Bending U-profile
The part can be manufactured
IRON BENDING TABLE AT 90°
S = material thickness
W = matrix width
b = minimum bend length
Ri = approximate internal radius
For example: 2 mm iron can be bent on a matrix of 10, then the minimum bend length must be greater than 7.5 mm, and the pressure will be 279 kN/m.
Iron bending table at 90°
STAINLESS STEEL BENDING TABLE AT 90°
S = material thickness
W = matrix width
b = minimum bend length
Ri = approximate internal radius
For example: 2 mm stainless steel can be bent on a matrix of 10, then the minimum bend length must be greater than 7.5 mm, and the pressure will be 434 kN/m.
Stainless steel bending table at 90°
CALCULATION OF THE MAXIMUM HEIGHT OF THE BOX
The maximum height of the box is primarily defined by the machine’s mounting height.
The mounting height is the maximum distance between the lower edge of the upper tool holder and the upper edge of the lower tool holder.
B = top edge to the center of the ram
A = residual tool path height
SHI = internal height of the box
OWH = upper tool height
UWH = lower tool height
EH = mounting height
Calculation of the maximum height of the box
TOP TOOLS
