Today, let's talk about whether CNC press brakes with electro-hydraulic synchronization or oil-electric hybrid systems are better. Many customers have this question when purchasing equipment. This is an excellent question. Currently, customers face a wide variety of CNC press brake models and may struggle to make a choice. Let's discuss which option is more suitable.
1. Comparison between Electro-Hydraulic Synchronization and Oil-Electric Hybrid Press Brakes
Comparing electro-hydraulic synchronization CNC press brakes to oil-electric hybrid press brakes is like comparing a tractor to a car.
In comparison:
- Electro-hydraulic synchronization press brakes are cheaper and suitable for bending large-sized sheet metal. They are more cost-effective for applications above 250 tons.
- Oil-electric hybrid press brakes, despite being more expensive, have several advantages. They use a dual servo bidirectional pump system to control the flow and pressure of the Y1 and Y2 cylinders. The oil in the upper chamber of the cylinders is directly pumped into the lower chamber to lift the upper die. Reversing the pump allows the oil in the lower chamber to be directly pumped into the upper chamber for downward bending. They are suitable for applications between 160 and 250 tons, with rapid descent speeds of 200 mm/s and return speeds of 200-350 mm/s. The synchronization of the upper dies on the machine is controlled by two sets of servo bidirectional pumps. These machines offer high precision, low friction, high synchronization, energy efficiency, low noise, power and oil savings, stability, reliability, and occupy less space. They are ideal for manufacturing high-speed press brakes with large stroke lengths.
Considering the above, oil-electric hybrid CNC press brakes have significant advantages over electro-hydraulic synchronization press brakes. As products continue to evolve and labor costs increase, purchasing machines that save time and labor is crucial.
2. Advantages of Servo Oil-Electric Hybrid CNC Press Brakes
Servo oil-electric hybrid (pump-controlled) press brakes include a power unit connected to the CNC system, control valve groups, and the power unit comprises a servo motor, a unidirectional quantitative pump connected to the servo motor, and an independent oil tank. The control valve group consists of relief valves, unloading valves, check valves, directional valves, back pressure valves, lifting valves, safety valves, and filling valves. The CNC system controls the rotational speed of the servo motor in the power unit, thereby controlling the displacement speed of the actuator (double-rod cylinder) by controlling the output of the connected oil pump. The CNC system sets the torque of the servo motor to control the output force of the left and right actuators (double-rod cylinders).
The servo oil-electric hybrid system uses two servo motors and a servo pump to control the left and right cylinders. The servo motor controls the output flow of the pump based on the programmed settings, thereby controlling the slide's movement speed and position. There is no throttling phenomenon throughout the process. Therefore, all the energy output by the pump is supplied to the left and right cylinders. This control method has no energy loss, resulting in significant energy savings.
Since the oil-electric hybrid system has almost no energy consumption loss, the process does not cause a significant increase in oil temperature. Consequently, this type of machine requires significantly less oil compared to electro-hydraulic synchronization CNC press brakes. Typically, the oil consumption of servo oil-electric hybrid machines is around 30% of that of conventional electro-hydraulic synchronization press brakes. This advantage is even more pronounced for high-tonnage and heavy-duty CNC press brakes, as they require only one-third of the oil consumption.
