Hydraulic, hybrid or all-electric press brake: how to choose

Pick an all-electric servo press brake for small, precise parts in thin sheet, where fast cycles, low energy use and quiet running pay back. Pick a hybrid servo-hydraulic machine for mid and heavy tonnage with far less oil and power draw. Pick conventional hydraulic for the heaviest plate, the longest beds and the widest choice of sizes.

Three ways to move the ram

Conventional hydraulic. Two cylinders, one on each side frame, push the ram down. A motor runs the pump, and proportional valves keep the two sides (the Y1 and Y2 axes) in step, read by linear scales. It is the design that scales furthest, from 3 m general-purpose machines to tandem plate brakes. On a 3 m class machine the oil tank typically holds 200 to 300 litres: Yawei lists 200 L for the PBH-110/3100 and Bystronic 300 L for the Xpert Pro 150/3100.

Hybrid servo-hydraulic. Cylinders still push the ram, but servo motors drive the pump only when the ram has to move, and the oil circuit is much smaller. SafanDarley's H-iBrake runs on 18 L of oil with energy regeneration, and the maker quotes up to 50 percent energy saving and a noise level under 70 dB. Its range runs from 125T to 560T.

All-electric servo. Servo motors move the ram through a mechanical drive, with no hydraulic pump, valves or oil. SafanDarley's E-Brake uses a patented roller and belt system. The drive draws meaningful power only while the beam moves, and SafanDarley quotes up to 70 percent energy saving against a conventional hydraulic brake. The E-Brake family spans 35T to 300T.

Side-by-side comparison

Tonnage and bed length

This is where hydraulic keeps its lead. Our catalog runs from 110-tonne, 3.1 m machines such as the Yawei PBH-110/3100 and the Accurl Euro Pro B 32110 up to the 400-tonne, 4 m Accurl Euro Pro B40400 and the LVD PPEB 640/61, which gives 700 US tons over 240 in and can be set up in tandem. Hybrids reach well into plate work: the H-iBrake 400T-4200 delivers 441 US tons over 167 in.

All-electric machines sit lower. The E-Brake 40-1600 gives 44 US tons over 60 in, sized for small parts, and the E-Brake family stops at 300T. If your force calculation lands above that, or your parts are long, the real choice is between hydraulic and hybrid. Size the machine first with our press brake tonnage guide, then pick the drive.

Speed and cycle time

Approach and return speeds are close across drives. The Yawei PBH-110/3100 approaches at 210 mm/s and returns at 190 mm/s; the E-Brake closes and returns at 425 in/min, about 180 mm/s. The difference shows in the bending stroke: the E-Brake bends at up to 20 mm/s, while the hydraulic machines in the catalog list working speeds of 10 to 17 mm/s and the H-iBrake 400T about 10 mm/s. On a small part with four or five bends, those seconds add up over a shift.

SafanDarley quotes up to 30 percent shorter cycle times for both its electric and hybrid lines against conventional machines. Treat any such figure as a manufacturer claim and time your own parts. Backgauge speed and tool changes often matter as much as the ram: Bystronic lists a backgauge speed of up to 650 mm/s on the Xpert Pro, which is a hydraulic machine.

Energy use

A conventional hydraulic brake with a constant-speed pump draws power while it waits for the operator. Servo-driven pumps and all-electric drives use very little at standstill, which is where most of the saving comes from. SafanDarley puts the standby saving of the E-Brake at up to 3,000 kWh a year.

What that is worth depends on your provincial electricity rates, your shifts and how long the machine sits between setups. For most job shops energy is a smaller cost driver than operator time, tooling and scrap, so use it as a tie-breaker between two machines that both fit the work, not as the main reason to buy one.

Accuracy

Ram positioning is now very precise on every drive type. Bystronic specifies Y-axis accuracy of 0.004 mm on the hydraulic Xpert Pro, and LVD mounts linear encoders to the bed of the PPEB so ram position is read independently of frame deflection. Electric machines add consistency from the first part of the morning, since there is no oil to warm up.

The angle on the finished part depends on more than the drive: sheet thickness variation, springback, tooling wear, crowning and the backgauge all play a part. If angle accuracy is critical, look at in-process angle measurement on whichever drive you choose, such as SafanDarley's E-Bend S, quoted at an accuracy of plus or minus 0.01 mm, or Bystronic's LAMS option.

Maintenance and oil

Hydraulic machines need scheduled oil and filter changes, and seals and valves wear over time. With a few hundred litres in the tank, oil handling and disposal is a real task, and weeping fittings around the bed are a housekeeping issue. Hybrids cut the oil volume sharply but keep cylinders, seals and a pump.

All-electric brakes remove the oil, pump, valves and filters entirely; SafanDarley also lists no cold-start problems and no pressure-valve adjustment. In exchange, the belts or mechanical transmission and the servo electronics are specific to the builder. Ask what wears, at what interval, and where the parts are stocked in North America. Standard hydraulic components are widely available; a servo drive fault usually needs the builder's own parts and diagnostics.

Noise and the working environment

All-electric brakes are very quiet, and hybrids come close: SafanDarley rates the H-iBrake under 70 dB. That matters where bending sits next to assembly or offices. The E-Brake Ergonomic version even lets the operator sit for long runs of small parts. Whatever the drive, point-of-operation safeguarding is required. In British Columbia, for example, WorkSafeBC's Part 12 guidelines point to CSA Z142 for brake press guarding; other provinces have their own rules.

Which drive suits which shop

• Small parts, long runs, tight angles: an electric servo brake such as the E-Brake class, for enclosures, brackets and small HVAC fittings.
• General fabrication at 100 to 250 tonnes: conventional hydraulic gives the widest choice of builders and budgets; a hybrid lowers running costs if the machine runs most of every shift.
• Heavy plate, long parts or tandem work: hydraulic or hybrid, since all-electric designs do not reach these sizes.
• Two machines: a practical split is a small electric brake for short parts next to a larger hydraulic or hybrid brake for long and heavy work.

Check early how the machine will connect to your supply, since many Canadian plants run 600 V three-phase, and how it will get electrical approval. Our guides to 600 V power for imported machines and CSA certification cover both.