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9 Major Differences Between Electro-hydraulic CNC Press Brake And Torsion Axis CNC Press Brake

Choosing between a torsion or electro-hydraulic CNC press brake is often confusing for many customers in the manufacturing industry. Although both machines are used for the same purpose, they have different features, functions and limitations. This article aims to clarify the differences between these two press brakes from different perspectives, providing help for novices or experienced professionals to make the right choice.

What is a torsion axis CNC press brake?

Generally, we call a torsion axis CNC press brake that uses a torsion bar for synchronization. The torsion axis synchronous bending machine adopts the torsion axis structure for synchronization. This type consists of two torsion bars connected to the frame, which transmits motion through connecting rods and rocker arms to achieve synchronous motion of the upper and lower dies, thereby completing the bending of the workpiece. Therefore, it is a mechanical forced synchronization method. Usually, it includes a main motor and multiple clutches to transmit power and drive the tool module.

What is an electro-hydraulic CNC press brake?

Usually, we call the ones that use electro-hydraulic synchronization electro-hydraulic CNC press brakes. Electro-hydraulic press brakes use a combination of hydraulic and electric servo systems to achieve synchronous movement of the upper and lower modules. The system consists of hydraulic cylinders, servo valves, sensors and control systems, and uses electronic signals to achieve precise control of the position of the slide. It is synchronized by using servo valves on both sides. The servo motor converts the rotary motion into hydraulic power, while the sensor continuously monitors the position of the mold. Using sensors and feedback mechanisms, position deviations can be monitored and adjusted in real time to ensure a more accurate bending angle.

Torsion axis VS electro-hydraulic CNC press brake

1. Precision and synchronization

The synchronous control of the torsion axis CNC press brake depends largely on the mechanical transmission system, and the accuracy is affected by the torsion axis, connecting rod and other components. The elastic deformation of the torsion axis and the adjustment of the adjustment rod will cause the slider to move asynchronously, affecting the bending angle and straightness accuracy, generally within 0.1mm. It is suitable for general bending scenarios, especially for smaller workpieces and processing scenarios with medium and low precision requirements. Our torsion axis CNC press brake can achieve an accuracy of ±0.01, which exceeds the industry standard and is a cost-effective high-performance solution.

The electro-hydraulic CNC press brake adopts a closed-loop control system to achieve high-precision synchronous bending operations. The system adjusts the movement of the hydraulic cylinder through the electro-hydraulic valve to ensure the precise synchronization of the mold movement. In contrast, the electro-hydraulic CNC press brake has higher bending accuracy, usually reaching a tolerance of 0.01mm or even smaller, and can still maintain good stability after long-term use. Therefore, it is very suitable for occasions with high precision requirements, especially the production of complex workpieces.

2. Operation speed and production efficiency

Due to the limitations of the mechanical torsion axis system, the speed and response speed of the torsion axis CNC press brake are relatively slow. It usually has a faster descent speed, but a relatively slow rise and return speed, because the torsion axis system takes some time to ensure the synchronization between the upper and lower modules. Changing the bending speed or performing complex multi-stage bending may require more time and adjustment. Its various speeds are usually fixed at a relatively constant rate.

The electro-hydraulic CNC press brake adopts advanced electric servo system and hydraulic control technology. The electro-hydraulic servo system quickly adjusts the movement speed and strength of the hydraulic cylinder, and has higher bending speed and production efficiency and efficiency. Through precise electro-hydraulic control, it can achieve higher bending speeds and faster working cycles, ultimately improving production efficiency.

3. Maintainability

The torsion axis CNC press brake adopts a simple mechanical synchronization system and has low maintenance costs. Its simple structure also reduces the need for complex control systems. Usually, it is sufficient to regularly check and lubricate key components (such as the torsion axis). The cost of replacing its components is also relatively low.

The electro-hydraulic CNC press brake involves complex electrical and hydraulic systems and has high maintenance costs. Its maintenance is also relatively complex. In addition to regular lubrication and inspection of key components, the control system needs to be maintained and calibrated to ensure normal operation. It is best to regularly check electrical and hydraulic components. The cost of replacing its components is also relatively high.

4. Number of axes

Torsion axis CNC press brakes usually have 3 main axes, namely:

Y axis: controls the up and down movement of the bending beam (upper die) to achieve the bending of the workpiece. The Y axis controls the vertical movement and is responsible for the up and down movement of the lower die during the bending operation.
X axis: controls the horizontal positioning of the back gauge to achieve the centering of the workpiece. The X axis controls the movement of the back gauge to position the workpiece during the bending process.
R axis (optional): controls the depth adjustment of the back gauge to achieve specific bending of the workpiece. The R axis is the rotation axis of the back gauge, which enables the back gauge to move up and down to adapt to different bending requirements.

Electro-hydraulic CNC press brakes usually have more axes to provide higher flexibility and precision. A typical CNC press brake may have 4 or more main axes, including:

Y1 axis and Y2 axis: These are two independently controlled axes of the hydraulic cylinder, which are used to achieve the up and down movement of the bending beam (upper die), ensure parallel movement of the upper die and uniform bending force distribution.
X axis: The X axis controls the movement and positioning of the back gauge.
R-axis: The R-axis controls the depth adjustment of the back gauge.
Z1 and Z2 axes (optional): These axes control the forward and backward movement of the upper die to accommodate different bending requirements.

5. Compensation system

Due to the differences in working principles and price positioning, torsion axis CNC press brakes are usually not equipped with compensation systems. On the other hand, electro-hydraulic CNC press brakes, with their advanced control systems and programmability, are positioned in a higher price range and can be equipped with compensation systems for more precise bending compensation. The presence of compensation systems improves the quality and precision of workpieces and meets the needs of complex components. The additional costs associated with compensation systems can be justified by the functionality and flexibility they provide.

6. Price Comparison

Due to the more complex and advanced structure and control system, electro-hydraulic CNC press brakes are generally more expensive than CNC press brakes. On the other hand, the system structure and working principle of the torsion axis CNC press brake are simpler, and they usually adopt basic mechanical or electrical control systems, which are lower in cost. CNC press brakes require high-precision parts and advanced control systems, which increase manufacturing costs and require more engineering design and production expenses. In the short term, the torsion axis series is more economical, but in the long run, the electro-hydraulic series provides higher investment value.

7. Scope of application

Electro-hydraulic CNC press brakes are suitable for applications that require high precision and high efficiency during the bending process. They are very suitable for mass production and complex workpiece production. Although they are more expensive, they provide higher processing quality and flexibility. Torsion axis CNC press brakes are suitable for general bending processes and are more suitable for small and medium-scale production and simple workpieces.

8. Scalability

Torsion axis CNC press brakes have limited scalability and are usually not easy to integrate with other equipment, and it is difficult to achieve tandem operation or robot integration. On the other hand, electro-hydraulic CNC press brakes have higher scalability, allow tandem operation with other equipment, and are easier to integrate with robots and other automation equipment. After integrating automation equipment, production efficiency will be significantly improved, labor costs will be reduced, and production safety issues will be avoided.

9. Operator skill requirements

Due to the CNC system and operating principles, the torsion axis CNC press brake relies more on the experience of the workers, which may require enterprises to pay higher wages to hire more experienced workers. On the other hand, the electro-hydraulic CNC press brake is relatively simple to operate, has lower requirements on the experience of the operator, and has a higher level of automation.

Conclusión

In short, companies should choose machines according to their specific requirements. In most cases, electro-hydraulic CNC press brakes are better than torsion shaft CNC press brakes. If the budget allows, electro-hydraulic CNC press brakes are a better choice in the long run. But under limited budgets, the torsion shaft series can also meet certain processing needs. Here I recommend the press brakes produced by DURMAPRESS. DURMAPRESS always insists on building high-quality machines. The torsion shaft CNC press brakes and electro-hydraulic CNC press brakes produced are consistent in workmanship. The slider is guaranteed not to fall to the ground to reduce deformation. The workbench of the torsion shaft is controlled to the limit in terms of details and precision. It is processed on the machining center. DURMAPRESS can confidently let customers go out and compare the production details of other companies and ours. DURMAPRESS can let you harvest higher quality machines!

Quiénes somos

Durmapress se especializa en el diseño, la fabricación y la venta de diversos equipos de procesamiento de metales, como plegadoras, cizallas, punzonadoras, máquinas de corte por láser, etc. La empresa se fundó en 2000. Con años de experiencia y acumulación de tecnología. DurmaPress se ha convertido en una de las marcas más conocidas de la industria china de maquinaria para el procesamiento de metales.