250T 3200mm high-precision electro-hydraulic servo bending machine

I. Equipment Overview
This equipment is a high-performance, high-precision electro-hydraulic servo synchronous CNC bending machine with a nominal pressure of 250 tons and a worktable length of 3200 mm. It integrates advanced electro-hydraulic servo drive technology and the ET19 high-performance CNC system, specifically designed to meet the high-precision, high-efficiency bending needs of metal sheets (such as steel plates, stainless steel plates, aluminum plates, etc.). It is suitable for various industries including power equipment, machinery manufacturing, elevators, doors and windows, home appliances, and steel structures.

II. Core Structural Components and Mechanical Introduction

1. Frame Section

Structural Form: Adopts an integral welded steel plate structure, optimized through finite element analysis (FEA), possessing extremely high rigidity, torsional resistance, and stability, ensuring no deformation under long-term full-load operation.

Left and Right Columns: Thick steel plate welded with internal reinforcing ribs, serving as the mounting base for the hydraulic cylinder and slider guide system.

Worktable: 3200 mm in length, cast or welded from high-quality steel, with a precision-machined upper surface, used for mounting the lower mold. The worktable has high flatness and load-bearing capacity. 2. Main Drive System

Drive Method: Electro-hydraulic servo pump control system. This is the fundamental difference from the traditional asynchronous motor + proportional valve system.

Core Components:

Servo Motor: Directly connected to the oil pump, with extremely fast response. It can control the speed and torque in real time and precisely according to the bending process requirements, consuming energy only during operation, achieving energy savings (20%-60% energy saving compared to traditional hydraulic presses).

High-Performance Gear Pump or Piston Pump: Matched to the servo motor, providing stable oil pressure.

Closed-Loop Control: System pressure and flow are directly controlled by the CNC system (ET19) to achieve sensitive response and high control precision.

3. Synchronization System

Torsion Shaft (Torsion Bar) Mechanical Synchronization: The classic and reliable synchronization method used in this model.

Structure: A solid high-strength alloy steel shaft running through the left and right columns is rigidly connected to the piston rods of the two hydraulic cylinders via connecting arms.

Principle: The piston rods of the left and right hydraulic cylinders are forced to move at the same displacement, thus achieving mechanical synchronization at both ends of the slider and ensuring parallel lifting and lowering. The structure is simple, rigid, and has strong resistance to eccentric loads, making it a key mechanical structure for ensuring consistent bending angles.

4. Slider and Guide System

Slider: A large box-shaped structure welded from high-strength steel plates, it is the moving component for mounting the upper mold. Its bottom surface is precision-machined to ensure a flat contact surface with the upper mold.

Guide System: Employs rectangular eight-sided adjustable guide rails (eight contact surfaces in total: front-back, left-right).

Advantages: The guide rail clearance can be adjusted using wedges, compensating for wear from long-term use, maintaining the perpendicularity of the slider to the worktable and ensuring smooth movement, avoiding "rail wear," extending machine life, and guaranteeing bending accuracy.

5. Hydraulic System

Oil Circuit Design: Integrated oil circuit block design, simple piping, fewer leakage points, and fast response.

Core Valve Group: Employs high-performance cartridge valves with large flow capacity, strong anti-contamination ability, and reliable operation.

Key Valves: Including the main relief valve (sets the system's maximum pressure), filling valve, and unloading valve, which work collaboratively under the instructions of the ET19 system.

6. Die System

Upper Die: Mounted on a universal upper die holder at the bottom of the slide block, featuring a quick-clamp design for easy die changes.

Lower Die: Mounted on the worktable, typically equipped with a multi-station die holder, allowing for flexible selection of different V-shaped openings to accommodate varying plate thicknesses and bending radii.

7. Backgauge System

Number of Axes: Standard configuration includes the X-axis (backgauge forward/backward movement) and the R-axis (backgauge up/down movement). Additional axes are optional.

Drive: Driven by a servo motor and a precision ball screw, providing fast positioning speed and high accuracy.

Structure: A robust square tube beam with independently programmable stop fingers, a key component ensuring bending dimensional accuracy.

III. Core Control System: Introduction to ET19

The ET19 is a high-performance CNC system specifically developed for bending machines, serving as the brain and nerve center of this equipment. Key Features and Functions:

High-Definition Large Screen: Color LCD touchscreen with a user-friendly interface and intuitive operation.

Powerful Programming Functions:

Graphical Programming: Allows direct drawing of bent workpieces and automatic program generation; or input of parameters such as dimensions, angles, materials, and thickness for automatic calculation of the bending process.

Multi-Step Programming: Can store programs for hundreds of steps, enabling continuous bending of complex parts.

Automatic Calculation: Automatically calculates process parameters such as springback compensation, slider stroke, and pressure.

Real-Time Closed-Loop Control:

Y-Axis (Slider) Control: Real-time feedback of slider position via a high-precision grating ruler, compared with ET19 instructions to form closed-loop control, achieving a repeatability accuracy of ±0.01mm.

X/R-Axis Control: Servo closed-loop control of each axis of the back gauge to ensure positioning accuracy.

Intelligent Safety and Diagnostics:

Safety Area Protection: Allows setting a safe operating area for the slider to prevent mold collisions.

Self-diagnosis: Real-time monitoring of hydraulic, motor, and sensor status; alarm messages and solutions pop up when abnormalities occur.

Easy Operation:

Real-time Angle Measurement and Correction: Optional angle sensor monitors the angle in real time during bending, compares it with the target value, and automatically compensates to ensure the first piece is qualified.

Manual/Semi-automatic/Automatic Multiple Operation Modes.

IV. Main Technical Parameters of the Equipment

Nominal Pressure: 2500 kN (250 Tons)

Table Length: 3200 mm

Throat Depth: 400 mm (Standard, larger options available)

Column Spacing: Approx. 2600 mm (Allows placement of wider workpieces)

Slide Stroke: 200 mm (Typical, adjustable)

Maximum Opening Height: Approx. 450 mm (Typical)

Rapid Descent/Feed/Return Speed: Precisely controlled by the ET19 system, adjustable

Main Motor Power: Approx. 22 kW (Servo Motor)

Control System: ET19 Electro-hydraulic Servo CNC System

Positioning Accuracy (Y-axis): ±0.01 mm

Backgauge Positioning Accuracy (X-axis): ±0.05 mm

V. Summary of Core Advantages of the Equipment

High Precision and Consistency: ET19 closed-loop control + torsion shaft synchronization + rectangular guide rails ensure precise slide movement and excellent repeatability of bending angles and dimensions.

High efficiency and energy saving: The electro-hydraulic servo system supplies oil on demand, consuming almost no energy during standby, with low noise and minimal temperature rise.

Intelligent and simple operation: The ET19 system's graphical interface reduces reliance on operator experience, enabling fast and accurate programming.

Stable and reliable operation: The robust machine structure, mature torsion shaft synchronization, and reliable hydraulic system ensure long-term stable operation, suitable for high-intensity production.

Easy maintenance: The system has self-diagnostic functions, and its modular design facilitates maintenance.

Applicable scenarios: This model is ideal for medium-sized enterprises engaged in multi-variety, small-batch or medium-batch production, especially suitable for modern sheet metal workshops with high requirements for bending accuracy and efficiency.