WE67K Electro-Hydraulic Servo CNC Hydraulic Press Brake

Introduction to the WE67K Series High-Tonnage Press Brakes

Originating from European technology
The maximum bending force of the single machine is 50,000 kN.
Maximum single-machine bending length: 18,000 mm
Dual-machine or multi-machine coordination
For Specialized Fields

(Machine tool exterior schematic diagram is for reference only; the actual product shall prevail.)

For more than three decades, Liwei has been dedicated to the innovative R&D and manufacturing of large-scale press brakes, accumulating extensive successful experience, serving a wide range of industries, and cultivating a broad base of high-end customers.
The WE67K series of large-scale press brakes is the optimal, tailor-made solution for your needs, allowing you to freely configure parameters such as bending force and working length and to select the appropriate auxiliary components. Liwei is a leading domestic provider of high-quality solutions for large-scale forging and pressing equipment, dedicated to the R&D, production, and manufacturing of large press brakes.

II. Machine Tool’s Resistance to Eccentric Loading

The electro-hydraulic proportional control system of this machine is a position-control system that uses an optical grating scale to dynamically detect the synchronization error of the slide. The proportional valve in the hydraulic system then corrects this error, ensuring that the slide remains parallel to the worktable at all times, even under full eccentric loading.

III. Structural Features of the Machine

External Structure

◆ Brand-new European design with a streamlined appearance; the structure has been optimized through finite-element analysis using 3D software.

Wall panel

Slider

Workbench

◆ The rack features an all-steel frame structure, offering excellent seismic resistance. It has undergone stress-relief treatment to enhance mechanical properties and improve the stability of welded components.

Large Annealing Furnace

The rack is machined and formed on a CNC floor-type boring-milling machining center and a five-axis milling machine, ensuring the parallelism and perpendicularity of all mounting surfaces.

Large CNC Floor-Type Boring and Five-Axis Milling Machine

Slider structure  
◆Top-drive bending design, low noise, and stable operation
◆Thickened and widened slider to minimize deflection and adjust the clearance.
◆Dual-guide-rail structure ensures smoother slider operation. Wear-resistant, self-lubricating guide plates are installed at all primary guiding locations to prevent wear caused by dry friction and protect the main components from direct wear. Inspections should be carried out in accordance with the instruction manual; if severe wear is detected, the components can be replaced, thereby reducing maintenance costs. (Figure 1)
◆Y1 and Y2 can be programmed independently, operate under eccentric loading, and perform tapered bending.
◆The bottom dead center features a programmable holding time to ensure dimensional accuracy for various molded parts, and includes a slow-return control function, enabling operators to better control the workpiece.
◆A universal upper die mounting surface that maximizes compliance with die clamping requirements.

Copper Powder Metallurgy Wear-Resistant Guide Rail Plate (1)

“C”-shaped plate inspection mechanism (2)

Hydraulic system

◆ Adopts the most advanced fully closed-loop electro-hydraulic servo synchronous control system

◆ Equipped with a stack of original German Rexroth hydraulic control valves

◆ Equipped with the Spanish FAGOR and Italian GIVI slide position measurement systems, along with a high-precision guiding system, it can meet machining requirements for full-length or eccentric loading.

◆ A “C”-shaped plate mechanism is installed at the die opening to directly measure the gap between the upper and lower dies, thereby ensuring part accuracy (Figure 2).

◆ The cylinder seals are from a world-renowned brand, offering excellent sealing performance and long service life.

◆ The hydraulic cylinder is manufactured using a comprehensive process that includes integral forging, rough machining, quenching and tempering, finish machining, and internal bore grinding, ensuring both high hardness and wear resistance as well as superior cylindrical accuracy of the inner wall. The piston rod undergoes hard-chrome plating followed by precision grinding.

u Hydraulic system fittings and connectors are manufactured by German company JS, offering excellent quality and performance.

◆ The hydraulic system is equipped with overload relief safety protection.

◆ Clear and intuitive oil level display

The machine tool can operate continuously under its rated load, with a leak-free hydraulic system and consistently stable machining performance.

High precision.

Post-positioning system

◆ The X-axis is the back-gauge control axis. The back-gauge mechanism employs a high-torque servo motor, a precision ball screw, and square linear guide rails, achieving an X-axis positioning accuracy of ≤±0.1 mm. Linear guide rails are mounted on the crossbeam, and three CNC-controlled gauge fingers are installed on these rails, enabling lateral movement. This ensures that the gauge fingers remain perfectly synchronized during motion, thereby guaranteeing workpiece accuracy.

◆ The R axis is the control axis for raising and lowering the back gauge, which is CNC-controlled and driven by a servo motor, enabling automatic up-and-down movement to meet bending requirements.

Rear stop X-axis

Electrical System

◆ Electrical components are sourced from overseas imports or joint ventures, meeting international standards, ensuring safety and reliability, long service life, and strong anti-interference capability.

◆ Portable push-button station (including foot switch) for convenient operation, with emergency stop function.

◆ The main motor is an INMOT three-phase asynchronous motor.

Worktable Deflection Compensation

◆ The lower worktable is equipped with an automatic mechanical deflection compensation mechanism.

The WE67K series press brakes feature a DNC-controlled, mechanically actuated, convex-wedge-type deflection-compensation worktable. Inside the worktable, several sets of inclined, convex wedges move relative to one another to achieve deflection compensation based on the principle of inverse profiling.

The mechanical wedge-type deflection-compensating worktable was granted a National Utility Model Patent Certificate in March 2016 (Patent No.: ZL 2016 2 1040682.X).

CNC numerical control system

DELEM DA53T from the Netherlands

◆ 10.1-inch high-resolution TFT color display

◆Maximum four-axis control (Y1, Y2, and two auxiliary axes)

◆Industrial-grade touch screen

◆Internal storage capacity: 1 GB

◆Mold library: 30 upper molds, 30 lower molds

◆USB storage interface, RS232 interface

◆ One-page quick parameter programming with navigation shortcuts

◆Automatic calculation of worktable deflection compensation

◆Data Programming

◆Microswitch Panel

◆Automatic calculation of bending force and die safety zone

◆Online Operation Analysis Tool

◆Angle Correction Database

◆System Diagnostic Function

◆ Real-time Windows CE operating platform ensures system stability and supports instant shutdown.

Mold Clamping and Configuration

◆ Upper die clamping method: quick-clamp type

Upper die quick-clamp type clamping

Adjustable Dual-V Coaxial Lower Die

Lower die groove: V8/V12/V16/V20/V24/V32V/48

IV. List of Major Supporting Components