In the field of small to medium-sized sheet metal processing, equipment selection directly determines processing accuracy, efficiency, and operating costs. Currently, there are two main technical routes for small to medium-sized workpieces: the Mini All-Electric Servo CNC Press Brake (pure electric direct drive) and the High-Speed Pump-Control Servo CNC Press Brake (electro-hydraulic servo energy-saving). There are systematic differences between the two in terms of driving principles, performance boundaries, and applicable scenarios. This article provides an objective analysis from a technical perspective.
I. Differences in Driving Principles and Structures
The Mini All-Electric Servo Press Brake (taking the PB-1506 as an example) uses a servo motor to directly drive the ram back and forth via a ball screw, completely eliminating oil pumps, tanks, and hydraulic piping. This structure fundamentally eliminates leakage and oil contamination. The rigid feedback of the mechanical transmission chain allows the ram repeatability accuracy to reach ≤±0.01mm.
The High-Speed Pump-Control Servo Press Brake (taking the WE67K-55T/1250 as an example) retains the hydraulic cylinder but replaces the original constant displacement pump with a servo motor-driven variable displacement pump. The system adjusts the speed and displacement in real-time according to the bending curve to supply pressure on demand. Magnetic scales on both sides of the ram form a full closed-loop feedback, and the Y-axis synchronization accuracy is corrected in real-time by the CNC system. This solution significantly reduces energy consumption during non-working phases while retaining the advantage of high thrust.
II. Performance Characteristics Analysis
Accuracy and Consistency: Both can achieve ≤±0.01mm ram repeatability. The all-electric model relies on closed-loop grating scales, offering outstanding angle consistency for short-stroke thin-sheet bending. The pump-control model compensates for parallelism deviation under off-center loading via dual magnetic scales, supports conical bending and programmable dwell time, ensuring stable batch consistency for medium-tonnage workpieces.
Energy Efficiency: The all-electric model only consumes power during movement, with near-zero standby power consumption. The pump-control model supplies pressure on demand, operating at low speeds during fast descent/return, offering significant energy savings compared to traditional hydraulics, though it still has basic hydraulic power consumption.
Maintenance Requirements: The all-electric model has no hydraulic consumables; daily maintenance only requires lubricating the guides and ball screws. The pump-control model requires regular oil changes, but with lower oil temperature rise and slower aging, its maintenance cycle is longer than that of traditional hydraulic systems.
Foundation and Installation: The all-electric model weighs about 2 tons and can be put into production by simply leveling the feet on ordinary cement ground. The pump-control model weighs about 3.1 tons and requires a foundation built according to technical requirements, which is a standard level for small to medium-sized equipment.
III. Applicable Scenarios
Mini All-Electric Servo Press Brake: Workpieces ≤600mm, mainly thin sheets, small to medium batches with high variety, clean workshops, limited space. Typical industries: 3C electronics, precision hardware, medical thin-sheet housings, R&D prototyping.
High-Speed Pump-Control Servo Press Brake: Workpieces ≤1250mm, requiring 55-ton pressure class, medium to thin sheet batch continuous production, hoping to retain hydraulic output while upgrading for energy saving. Typical industries: electrical cabinets, automotive brackets, general hardware, home appliance sheet metal.
IV. Selection Advice
Selection should be based on workpiece material, thickness, length, and batch rhythm. For thin precision parts within 600mm requiring a clean environment and low maintenance, choose all-electric; for 1250mm class, 55-ton class, and those wanting hydraulic energy-saving upgrades, choose pump-control servo. The two are not substitutes but cover different market segments. It is recommended to provide workpiece drawings for process calculation and cycle time measurement.
| Key Technical Parameter Comparison | ||
| Project | Mini All-Electric Servo Press Brake (PB-1506) | High-Speed Pump-Control Servo Press Brake (WE67K-55T/1250) |
| Driving Method | Servo motor + ball screw direct drive, no hydraulic system | Servo motor drives variable pump → hydraulic cylinder, full closed-loop synchronization |
| Rated Pressure / Length Class | 150 kN (approx. 15T) / 600 mm | 550 kN (55T) / 1250 mm |
| Ram Repeatability | ≤ ±0.01 mm | ≤ ±0.01 mm (magnetic scale feedback) |
| Ram Speed | Fast down/return 200 mm/s; working 8–50 mm/s | Fast down 380 mm/s; working 25 mm/s; return 300 mm/s |
| Control Axes | 3 axes (Y-X-R) | 3 axes (Y-X-R) |
| Main Motor Power | 7.5 kW | 5.5 kW (on-demand pressure supply) |
| Weight / Footprint | Approx. 2 t; 1100×1000×2150 mm | Approx. 3.1 t; 1400×1140×2180 mm |
| Hydraulic System | None | Servo pump control, retains hydraulic output |
| Primary Orientation | Thin sheet short parts, clean workshop, minimal maintenance | Medium-thin sheet batch, energy-saving upgrade, tonnage margin |