How to tell and choose torsion axis press brake machine and electro-hydraulic CNC press brake machine

In the metalworking industry, the press brake machine (bending machine) plays a vital role in shaping sheet metal into different desired forms. With technological advancements, bending machines have evolved, resulting in two commonly used types: torsion bending machines and electro-hydraulic bending machines. Aclpress here aims to explain the key differences between them.
1. Working principle:
The twisting shaft bending machine uses mechanical force transmission to adjust the position of the bottom die by hand, completing plate bending. Usually, a hand-bending machine is used, where force is transmitted to the bottom mold through a handle or foot pedal control mechanism, allowing for plate bending. An electro-hydraulic CNC bending machine operates with an electro-hydraulic servo system, which drives a hydraulic cylinder or electro-hydraulic servo system to move the bottom mold. The CNC system accurately controls the position and speed of the mold to achieve precise bending angles and shapes.
2. Accuracy and load capacity:
The parallelism of the slider is a crucial factor that affects the workpiece angle. However, the mechanically forced synchronization mode used in torsion bending machines lacks real-time error feedback, resulting in lower machining accuracy. Moreover, the bending machine has limited deflection load capacity and prolonged operation under eccentric loads can cause torsion shaft deformation. To achieve precision machining, the electro-hydraulic CNC bending machine employs a closed-loop control system comprising a CNC system, a hydraulic control group, and an optical grid ruler for feedback. Additionally, its Y1 and Y2 axes operate independently, ensuring excellent bending performance even under unbalanced loads.
3. Different operation methods:
The twisted shaft bending machine typically lacks a control system and V-shaft compensation function, making the operation relatively laborious. Operators heavily rely on their experience and skills to test bending and make adjustments during the processing procedure, which not only leads to potential wastage but also requires high skill levels from workers. In contrast, the electro-hydraulic CNC bending machine is equipped with a professional CNC system that enables easy operation and possesses a high level of intelligence. By inputting the drawing into the CNC system, operators can automatically execute the bending process. Additionally, the electro-hydraulic CNC bending machine includes a simulation bending function for pre-processing simulations to ensure accuracy and stability.
4. Applications:
The torsion bending machine is suitable for simple plate bending, meeting the lower requirements of bending products in terms of material and size.
The electro-hydraulic CNC bending machine is ideal for bending more complex shapes of plates, meeting the demands of higher accuracy in bending operations. It is also capable of handling larger and different types of materials.
The overall solely pertains to typical differences, and the electro-hydraulic CNC bending machine has gradually superseded the torsional shaft bending machine due to its advantages, exceptional precision, high load capacity for deflection, straightforward and expeditious operational mode, as well as remarkable processing efficiency. 
However, when selecting bending equipment,  it is advisable to consider actual demand and budget and specific features of designed machines.