Bending

Bending radii

We always provide a bending radius according to standard bending tools in our possession, and sometimes bend with a deviation of R +/-3. For a clearly different radius (e.g., R20 or R50), the correct radii will be applied, but a deviation of +/- 3 is still possible (so R50 can range between R47 and R53).

Holes close to the bend line

Holes, openings, or cuts too close to the bend line pull apart or cause deformation. Possible solutions:

  • Just leave it as is, not a problem (standard, without extra info from you)
  • Customer changes the design (if it's just a few mm or relocating a hole, this is without extra cost, but it must be clearly specified when ordering)
  • Make a cut on the bend line at the hole location without welding it back (no extra cost, but it must be clearly specified when ordering)
  • Make a cut on the bend line at the hole location and weld it back (extra cost to be requested, but it must be clearly specified when ordering)

Internal/external dimensions

Bending parts also requires indicating whether dimensions are internal or external for description or sketch without electronic drawing. Standard, without extra info, we assume that the dimensions you provide are external or outer dimensions. A bent sheet 200/100 and plate thickness 2 mm is bent with outer dimensions 200/100, so internal dimensions 198/98 mm. Please specify internal or internal/external dimensions clearly.

Intermediate bend/back bend

At an intermediate bend or back bend, a marking and slight indentation is visible. We try to minimize this. More info about intermediate bends can be found here.

Bending regarding segment bending or small bends

If plate rolling or rolling is no longer possible (e.g., for technical reasons), Alinco bends with segment bends, and you still get a nice rounding. Each bend has its cost, and the segment bending technique is only used as close together as the application requires. If a customer needs a type of trough and is satisfied with 8 bends relatively far apart, there is no point in using the segment bending technique. Therefore, we often specify the number of segment bends in the quotation so that the customer knows what they are getting.

Minimum internal dimensions

There are limitations to bending; not everything can be bent. Per plate thickness, we need a minimum length to bend:

Form pieces – square/round

Form pieces/cones bent by us and further welded by you: we bend these as well as possible, but sufficient knowledge and skill are needed to weld them further. They often need to be hammered/shaped further. With square/rounds, also consider an extra cut at the corners.