Durma – PBF 2560

Fast glance. Steel frame, chunky rolls, no flashy paint tricks, just matte grey and a red Durma badge. Looks like it woke up in a fab shop and wants to flatten something right now. The model code 2560 keeps whispering 2500 mm length, 6 mm plate, nothing mystical there.

Brand context

Durma sits in Konya, Turkey, stamping out machines since 1956. Rough count, over 8 000 units a year, roughly 14 plate-roll models if you include the three-roll PB series. So, the PBF line is the four-roll sibling, it has gone through 3 hardware revisions, mainly on the hydraulic manifold and the NC panel layout.

Why four rolls matter

Short version, less material waste at the lead edge, quicker squaring, one-pass cones. Long version, go grab coffee.

• Pre-bending on the same machine saves one crane lift.
• Side rolls move independently, so tapering a duct section for HVAC or a bucket shell for an excavator is two clicks, not a wrestling match with shims.
• New operators learn quicker, because the sheet never leaves the pinch zone.

Quick spec table to stare at

Before diving deeper, park your eyes on numbers, then come back.

Numbers done, headache gone, carry on.

Frame and rolls

The main frame is a single weldment, stress-relieved in a furnace, then machined on a floor borer. No fancy claims, just flat mounting pads so the bearings sit square. Top roll is SAE 1045 medium carbon, induction hardened to roughly 50 HRC over 3 mm depth. That hard skin keeps surface pick-up under control when a plate with scale sneaks in. Side rolls slightly softer, lets them flex a hair, grips better.

Drive train

Durma still sticks to a hydraulic motor on each end of the top roll. Planetary reducer sits right on the roll neck, fewer shafts, fewer greased couplings to fling out. Good for desert heat in Sharjah, less rubber seal drama. The hydraulic pack uses Sun cartridge valves, easy swap if one gets stuck with sand.

Control panel vibe

Entry level panel, NC Touch 7. Big icons, no deep sub-menus. Operator punches material thickness, diameter target, machine nudges side rolls into calculated position. Ten programs, twenty steps each. If you feel adventurous, Durma offers a Cybelec CYB-Touch upgrade, full color, USB, radius measurement probe, but base unit already ships workable.

Workflow in a UAE job shop

Hot afternoon, 3 mm 316 L stainless, you need chimney sections for a roof stack on a hotel kitchen. PBF 2560 grabs a 1250×2500 blank, quick pinch, pre-bend first edge, rolls, spits out a clean cylinder, no flat. No re-rolling, no extra crane moves. Weld, brush, next.

Now swap to 5 mm S355 plate for an oilfield skid tank skin. Same story, just drop line pressure to 160 bar to calm the hydraulic pump, add one extra pass. Still under five minutes per shell. The pace fits medium batch fabrication shops dotted around Jebel Ali free zone.

Little annoyances, be honest

I wish the factory added a cordless pendant. Walking from the fixed panel to the plate edge for checking the offset feels 1990s. Oil cooler fan is loud too, not ear-bleed, but enough to drown casual chat.

Field tips from users on forums

• Tighten the felt wipers quarterly or scale will scratch the top roll.
• Replace the stock magnetic scale covers with aluminium channel, desert dust slides off.
• Keep 10 W-40 hydraulic oil for summer, 5 W-30 works in cold storage shops.

Competitive snapshot

Let us throw the PBF 2560 against two regulars.

• Haeusler VRM 25-6: Swiss build, servo-hydraulics, same 6 mm capacity, but twice the price and electronics that beg for a climate-controlled room.
• MG 4R 2520: Italian, 4-roll, 20 mm capacity, clearly heavier, but the footprint is 40 % larger, not every Dubai workshop can spare that.

So the Durma sits in that sweet middle ground, modest floor space, no exotic spare parts, yet still four rolls. For many managers that is the deal maker.

Series cousins

Inside Durma’s catalog you see PBF 2540, 2550, 2560. Same frame width, only top roll diameter and hydraulic pump flow change. If you mostly bend HVAC ducting, grab the 2540, cheaper, 4 mm material, weighs under 3 t. Heavy fabricators go 2550 for 5 mm, or our 2560 for 6 mm. Same learning curve, same NC panel, so operator retraining is zero.

Typical parts leaving the machine

• Cylinders for water filters up to Ø400 mm
• Cones for transition ducts, offset up to 30 % without edge trim
• Mild steel tanks for small generators, one piece shell

Each takes less than five passes, weld seam stays under 0.8 mm mismatch because the ends are pre-bent tight.

Maintenance snapshot

Change hydraulic oil every 2 000 h or yearly, whichever first, check suction filter, swap return filter. Grease bronze support rollers weekly, easy because fittings sit at waist height. Bearings are standard SKF 222 series, local bearing shops in Abu Dhabi keep them on shelf, downtime fear drops.

Energy chatter

7.5 kW might look tiny next to a laser, but plate rolling is steady load. On 8-hour shift it pulls roughly 50 kWh, that is about the same as one mid-size compressor. If you pair the machine with a rooftop solar array you offset most daytime use, decent talking point for ISO-14001 audit.

Noise and safety

Machine hums around 68 dB at operator ear thanks to integrated muffler on the hydraulic pack. Still, hand on heart, step back when the sheet snaps at the last curve, the stored elastic energy can pop. Durma ships a light curtain but many shops bypass it, do not.

Short bullet recap before you run for coffee

• Four rolls, less scrap on pre-bend edges
• 2500 mm x 6 mm hits typical HVAC and tank jobs
• NC touch panel, no calculus degree required
• Spare parts stocked in Dubai, customs drama minimal
• Frame small enough to fit a 6 m container if you ever relocate

In closing, who buys and why

Family-owned fab shops making ducting, tank wrappers, and light construction frames like the PBF 2560 because it handles the bulk of their steel skew without demanding a climate cell or a Swiss service contract. Big EPC contractors still stick a heavier 12 mm machine in the corner, yet keep this Durma near the TIG stations for stainless shells. That practicality is the quiet advantage people pay for.

Key benefits in one gulp

• Keeps sheet flat during pre-bend, less rework
• Compact footprint leaves room for the forklift lanes
• Hydraulic components from global brands cut downtime

Those three points tilt the purchasing meeting when the CFO asks why not go cheaper. You show data, questions fade.