The electro-hydraulic servo bending machine is a CNC bending equipment that adopts electro-hydraulic servo control technology. It is also known as the electro-hydraulic valve-controlled servo bending machine. It is widely used in the sheet metal processing field. The current market wholesale price range is approximately 10,000 to 360,000 yuan per unit. The specific price varies depending on the model, tonnage, configuration, and manufacturer.

Working principle and core technology

‌Electro-hydraulic servo control technology‌: The equipment consists of an electronic signal processing device and a hydraulic power mechanism to form a feedback control system. It integrates the advantages of electrical and hydraulic technologies and adopts a dual servo pump control system.

Closed-loop control system: A closed-loop control is achieved through the combination of electro-hydraulic servo valve and grating ruler. The numerical control system, hydraulic control valve group, and grating ruler together form a feedback loop. The repeatability positioning accuracy of the slider can reach ±0.01mm, with the maximum accuracy being 0.005mm.

Synchronous control design: Both main oil cylinders are controlled synchronously. The computer uses two sets of servo bidirectional pump systems to separately control the flow and pressure of Y1 and Y2 oil cylinders. When there is an error, the numerical control system adjusts through the proportional valve to ensure that the travel of the slider on both sides is synchronized.

Performance features and advantages

‌Energy-saving and efficient‌: Standby power consumption is reduced by over 75%, working speed is increased by 15%-25%, and the amount of hydraulic oil used is approximately 1/3 to 1/5 of that of ordinary hydraulic systems.

High-precision processing: The repeatability positioning accuracy of the slider reaches ±0.01mm. The hydraulic deflection compensation is automatically adjusted by the numerical control system. Through the design of a high-stiffness frame and the installation of linear scales, stable bending angles can be achieved.

Reliable structure: The fuselage is made of an integral welded structure. Key components have undergone ANSYS finite element analysis. The hydraulic system adopts an integrated control system, which reduces pipeline installation and helps improve operational stability.

Selection Points and Common Parameters

‌Load Capacity Selection‌: Choose the model based on the length and thickness of the processed workpiece. For small-sized workpieces, 70-80 tons can be selected. For large-scale workpieces, a capacity of 100 tons or more is recommended. The specific length of the workpiece is one of the most important reference data for purchase.

Numerical Control System: Supports models from Dutch DELEM, Italian ESA, Swiss CYBELEC, etc. It features automatic selection, program calculation, and robot bending functions. Some systems also support 2D/3D graphic programming.

Common parameter ranges:

Nominal force: varies from 40T to 800T.

Bending length: 1600mm to 6000mm.

Slider stroke: 150mm to 600mm.

Main motor power: 5.5kW to 55kW.