The press brake is widely used in the household industry, construction, machinery, automobile, aviation, and other fields.
The press brake bends the sheet metal through the upper and lower dies at the ram.
Different punches and dies can produce profiles with different angles and shapes.
The material and opening of the die should be selected according to the workpiece and bending method.
There are oil cylinders on the left and right uprights respectively, which can drive the movement of the ram.
The stroke of the ram is controlled by the hydraulic and electrical systems.
The oil cylinders, and hydraulic and electrical control system ensure the accuracy of repeated bending.
The body of the press brake is composed of two vertical plates of steel structure.
There is also a workbench at the bottom of the press brake.
In order to prevent the workbench and ram from deformation due to long-term overload.
The hydraulic press brake is equipped with a crowning device, which can compensate for the deflection of the workbench and ram.
Installation of Press Brake
As the press brake is a large machine, it needs a crane to lift the press brake for unloading and transportation.
The rope of the crane should be strong enough and long enough to ensure the safe lifting of the press brake.
Fix the chain on the front lifting hole of the machine.
Use a crane with a safety device to lift the press brake.
It is loaded on the truck and then transported to the installation site for installation.
In order to ensure the bending accuracy of the press brake, the press brake needs to be leveled regularly.
Place the press brake on the horizontal ground, and place the spirit level on A1 and A2 to test its levelness respectively.
Faults of 1-2 mm per meter are allowed. If the difference is too large, the leveling bolts at the bottom of the press brake need to be adjusted.
The Connections of Electric
Let professionals check the electrical wiring of the press brake and connect the power supply.
The electrical connection of the three-phase system should be in the correct position.
When the press brake is connected to the three-phase power supply, the direction of the pump rotation drive motor must be correct.
If the motor turns incorrectly, the phase of the inlet circuit needs to be changed, but the internal circuit cannot be changed.
Restart the oil pump motor and check the steering.
Before checking the rotation direction of the motor, make sure that the press brake has been cleaned and leveled.
In the hydraulic drive system of the press brake, the AC servo motor drives the ram to move.
The AC servo motor also drives the hydraulic oil to align with the variable speed pump.
The driving device is installed on the beam and connected with the machine body through the guide rail.
The press brake control system controls the position of the beam and moves the beam up and down through the drive motor.
There are grating rulers on both sides of the press brake, which can read the signal and feedback to the control system.
The control circuit, filling valve, and servo valve in the oil cylinder are independent and controlled by the DNC controller.
The Hydraulic system or electro-hydraulic servo system can improve bending accuracy and reduce energy consumption and cost.
The hydraulic system is so important, so what is involved in the use and maintenance of the oil cylinder?
First of all, to maintain the cleanliness of the hydraulic system, the cleanliness of the oil tank and hydraulic oil is a cardinal task.
Every time you change the hydraulic oil, wipe the inside of the oil tank with a soft towel and clean the oil tank with clean gasoline.
Open the valve storing the dirty oil, drain the dirty oil, and wipe off the stains on the surface of the oil tank.
The oil temperature of the hydraulic oil of the press brake should not be used at too low or too high a temperature.
If the temperature is below zero or above 70 degrees, an oil heater or cooler can be installed.
Hydraulic oil should be filled through the air filter.
After filling, also operate the machine to discharge the bubbles in the hydraulic circuit.
Back Gauge of Press Brake
The back gauge of the press brake is used for the positioning of the workpiece.
Place the workpiece on the lower die and push it into the machine, and the stopper finger of the back gauge will dock with the workpiece.
The axes of the back gauge can move in different directions through the control of the control system.
The X-axis can move forward and backward, the R-axis can move up and down, and the Z-axis can move left and right.
Each axis of the back gauge is driven by an independent motor.
The Z-axis and R-axis can also be adjusted manually, but only from the back of the machine.
The linear guide rail and ball screw make the axes of the back gauge move freely.
The back gauge moves in the X-axis direction, and the force is limited to 150N to prevent the collision.
Operating the Press Brake
Precautions before operating the press brake:
Check whether the switch, control, motor, and grounding are in a normal state.
Check the oil level of the oil tank and the condition of the hydraulic system.
Idle the machine and maximize the stroke of the press brake.
Check whether the machine is in normal operation.
Whether the rotation of the motor is normal and whether the sound is abnormal.
Tooling assembly and alignment
Before installing the punch and die, the machine should be in a stopped state before installing the lower dies and the upper dies.
The upper and lower dies of the press brake need to be aligned to obtain higher bending accuracy.
By driving the ram downward, the upper dies are close to the lower dies, leaving a distance of workpiece thickness.
Manually adjust the position of the upper and lower dies through the bolts of the lower dies and the clamps of the upper dies.
After the upper and lower dies are aligned, the ram will be driven upward.
Tool splicing and replacement
Select manual mode, lower the ram, and turn off the press brake.
To change the tool, you need to stop the machine and remove the toolings from the side.
Then put a new die from the side and tighten the bolts or clamps
Now there are many quick clamps for quick replacement of toolings, which are convenient and fast.
There is no need to loosen the bolts, and the toolings can be loaded and unloaded vertically.
Shut down the machine
When turning off the press brake, you need to switch to manual mode
Lower the ram by stepping on the pedal to align the upper die with the lower die.
Press the stop button and turn off the main motor. The switch parameter is set to 0.
In case of emergencies, you can also press the emergency stop button.
But this will not affect the subsequent procedure, because only the axes and pump are turned off.
Release the button to restart.
Maintenance of Press Brake
The press brake should be regularly maintained and troubleshot by professionals.
Including lubrication and cleaning of machine parts, use of high-quality lubricating oil, weekly lubrication of worn parts,
For the cleaning and oil level inspection of the hydraulic system, the hydraulic oil needs to be replaced regularly.
Check whether the wiring of the electrical cabinet is in good condition.
Check the signal of the sensor, such as the grating ruler, and also check the tightness of the bolt.