Technical Resources for Sheet Metal Fabrication

Which press brake models do you build?

We build the WE67K series, including the 100T/3200 with DELEM DA-53T control, and the KPS-6020 60T/2000. Larger tonnages and longer beds are built to order. If none of them fits your part, the frame and the tooling can be built to your drawing instead. Model specifications are on the press brake product pages.

How do I calculate the tonnage I need?

For mild steel at about 450 MPa, required force in kN is roughly 650 x t squared x L / V, where t is thickness in mm, L is bend length in metres and V is the die opening in mm. A 1 m bend in 3 mm mild steel on a 24 mm V-die works out at roughly 250 kN, about 25 tonnes. For other grades, scale by tensile strength divided by 450. Always leave headroom: never plan to run a machine at its rated tonnage.

Which V-die opening should I use?

About 8 x material thickness for mild steel. Use 6 x for thin or soft material and 10-12 x for thick plate, where a wider opening reduces the force needed. Minimum flange length is roughly half the V opening plus the thickness, so a short flange on a small V-die may simply be impossible without special tooling.

Why does my bend angle drift over a long run?

Almost always the material, not the machine. Mill tolerance on thickness and tensile strength moves the angle with it. Angle correction and a crowning table compensate for bed deflection, but neither can absorb a 0.3 mm thickness swing. Check incoming sheet before you adjust the control.

What controller do you use?

DELEM DA-53T on the WE67K series. Other controls are available on request, and the control language can be specified at order.

Torsion bar or synchronized CNC: which do I need?

A torsion bar mechanically links the two ram ends, so the ram stays parallel by geometry: simpler and cheaper. A synchronized CNC machine drives both cylinders independently with a linear scale on each side and corrects them in the control, which holds parallelism better on long beds and off-centre loads.