WE67k 300Tx3200 Electro hydraulic servo CNC press brake

1，Machine model name

Model: WE67k 300Tx3200 Electro hydraulic servo CNC press brake

Image（For reference only）：

Brief introduction:

A bending machine is a device used to complete the overall bending and forming of sheet metal. Generally, after one stroke of the slider, it can bend into a certain geometric shape of cross-sectional profiles. If the mold is replaced and bent multiple times, various complex cross-sectional shapes can also be obtained.

In forging equipment, bending machines have become one of the most popular metal forming equipment, with applications covering almost all industrial fields such as aviation, shipbuilding, railways, highways, mining, metallurgy, automobiles, home appliances, construction machinery, engineering machinery, agricultural machinery, light industry, instrumentation, and electrical engineering

2, Main parameters

3、 Structural and performance characteristics:

（1） Electro hydraulic servo synchronous control system:

The electro-hydraulic servo synchronous control system mainly consists of a hydraulic system, a detection system, and an electrical control system. The hydraulic system includes a pump control block and a synchronization control block, which contain a filling valve, an electro-hydraulic proportional valve, a closed-loop control valve, and an electronic amplifier for the closed-loop control valve. Its function is to control the pressure of the hydraulic system, execute the up and down operation of the two oil cylinders, and its pressure can be infinitely adjusted between 0~30MPa. The proportional flow valve port can be infinitely changed to ensure the synchronization of the two oil cylinders.

The detection system includes two incremental grating rulers and a signal amplifier, which are used to detect the displacement at both ends of the slider and provide feedback to the electrical control system. On the one hand, it provides the position of the speed conversion point, and on the other hand, it provides the difference between the two ends.

The electrical control system is a specialized CNC system for German Alpha bending machines, with different models and varying levels of functionality. However, its most basic functions are: firstly, to control the opening of the electro-hydraulic proportional valve based on the difference feedback from the detection system, ensuring the synchronization of the two oil cylinders; secondly, to calculate and determine the system pressure, slider positioning position, and material blocking positioning position based on programming parameters.

Due to the fact that the entire system is a world-renowned product, its reliability and accuracy are very high. Even under extreme load changes or one-sided load conditions, the synchronization accuracy of the dual cylinder is less than 0.02mm, and its anti-interference ability is very strong.

The cost-effectiveness of this system is considerable when used for high-precision parts or large tonnage situations.

（2） Electro hydraulic servo hydraulic positioning system:

Due to the synchronous accuracy of the electro-hydraulic servo synchronous bending machine always being controlled within 0.02mm, and its electro-hydraulic proportional flow valve being able to be completely closed, the final positioning of this bending machine can only rely on closing the oil inlet and pressure maintenance of the two oil cylinder chambers. Its positioning position is accurately ensured by a grating ruler, and the repeated positioning accuracy is not greater than 0.02mm.

From the previous synchronous control characteristics and the current bending angle control characteristics, the mechanical part and cylinder structure of the electro-hydraulic servo synchronous bending machine are much simpler and easier to manufacture. Especially evident in large tonnage bending machines, this type of bending machine is widely accepted by users.

（3） The rear material positioning adopts a numerical control device.

（4） Motion control of slider operation:

After adjusting the lower limit of the slider and the positioning of the rear stopper, it can be bent. The operation of the slider is completed by the cooperation of the hydraulic system and the electrical system. According to the characteristics of the bending process, the operation program of the slider is:

Top dead center, fast down, speed transition point, work in, bottom dead center, pressure relief and return.

When quickly descending, the upper and lower oil ports are fully opened to open the fuel tank, and the slider rapidly descends under its own weight. At this time, the upper chamber is filled with oil from the fuel tank through the filling valve; After reaching the speed conversion point, the lower chamber oil port is changed to low-pressure closure, the filling valve is closed, and the upper chamber is a slow downward flap of the oil pump inlet slider, called the working inlet; After reaching the bottom dead center, the slider stops descending and the system maintains pressure; After the upper chamber is depressurized, return and complete one cycle.

4、 The process flow of the machine:

1. Shot blasting cleaning treatment of sheet metal:

Shot blasting cleaning treatment has the following advantages:

(1) Improve the corrosion resistance of mechanical products and metal profiles

(2) Improve the fatigue resistance of steel and extend its service life

(3) Optimize the surface process state of steel

(4) Beneficial for the cutting and precision cutting of CNC cutting machines

(5) Due to the regular shape of steel plates before processing, it is beneficial for mechanical rust removal and spray coating after final assembly

2. CNC cutting and cutting of steel plates:

3. Planing and milling of plate-like parts

4. Welding forming with aging vibration to eliminate internal stress

5. After annealing, the overall welded parts enter the processing procedure

6. Assembly, testing, folding, painting

5，Technical characteristics and performance description:

5-1. The model is advanced and beautiful, with two oil cylinders fixed on the left and right wall panels. The overall force state of the machine is reasonable and the rigidity is sufficient.

5-2. The electro-hydraulic servo synchronization method is adopted to ensure the synchronization of the oil cylinder, with good synchronization performance, strong anti offset load ability, easy debugging, and single control of the stroke Y1 and Y2 of the two oil cylinders. Two grating rulers are equipped to detect the displacement of the slider, and the positioning accuracy can reach 0.02mm, with a repeat positioning accuracy of 0.02mm.

5-3. The rear material is controlled by numerical control. We use the DE-15 CNC system from Germany's ref company.

Characteristics of DE-15 Numerical Control System：

1. Support switching between angle programming and depth programming

2. Support mold library product library settings

3. Each step can freely set the opening height

4. The position of the shifting point can be freely controlled

5. Standard Y1, Y2, R and other multi axis extensions

6. Support mechanical compensation workbench control

7. Support automatic generation of large arc programs

8. Support multiple step changing options such as top dead center, bottom dead center, loose foot, delay, etc., effectively improving processing efficiency

9. Support simple cable trays for electromagnets

10. Support fully automatic pneumatic drag bridge function

11. Support automatic bending, achieve unmanned bending control, and support up to 25 steps of automatic bending

12. Support valve group configuration function, fast down, slow down, return, unloading action and valve action time control

13.200 product libraries with 25 steps, each product library name can be customized in both Chinese and English, and the large arc supports 99 steps

6，Machine functions

6-1. Basic functions

·Adopting real-time Windows embedded operating system, it can achieve instant shutdown

·Fashionable exterior design, easy to operate, reflecting a people-oriented approach

• Two dimensional graphical programming

·Built in PLC function reduces circuit design and increases reliability

·USB interface

·Automatic accumulation of machine working time and bending times

• Automatic preparation of bending process

·The shape of the machine tool, mold, and workpiece can be freely scaled in a 1:1:1 ratio in a graphical manner

• Comprehensive collision detection function, eliminating waste products

·Error warning system to prevent misoperation

• Built in word processor

• Memory capacity 32MB

• Remote diagnostic function

• Conversion between metric and imperial systems

·Multi machine linkage operation

·Multiple text displays in Chinese

·User Program Interface (USB)

6-2. Auxiliary functions

• Diagnostic program

• Help text, online help function

• X and Y axis teaching demonstration

6-3. Optional Features

• Network interface

• Material handling control

• Automatic angle correction sensor interface

• Barcode recognizer interface

• USB hard drive

6-4. Automatically calculate content

• Position of speed conversion point

• Mold safety protection zone

• Clamping point position

• Bending force kN

• Match between programmed values and actual positioning values

• Bottom bending pressure

• Expand length

• Workbench deformation compensation

• Mold safety zone

• Automatic calculation of large arcs

6-5. Interface

The second serial interface required for PLC safety

7，Main configuration

8、Main technical parameters of electrical control system

1）power supply：Voltage: three-phase 380V AC -+10%

                          Frequency: 50Hz ± 1HZ

2）Operating environment    temperature -20 to+50 ℃

     Humidity  20-85% (non condensing, non condensing)

     Altitude ＜ 1000m

3）Protection level:  Electrical control cabinet   IP40

Control box     IP45

If you need a cnc press brake or are interested in a cnc press brake, please provide the plate material,  plate thickness, and plate width (bending length) , and we will recommend a suitable cnc press brake model for you.