Adjustment and use of Press Brake

1. Adjustment of the machine tool
(1) Adjustment of the parallelism between the slider and the worktable
If the machine tool is a torsion axis synchronization, a turbine box is installed on the upper end of the cylinder, and the left and right cylinders have a detachable synchronization shaft, and two hexagonal tubes are added to connect the left and right cylinders. The cylinder worm rotates clockwise for one circle, and the cylinder piston rises 0.2mm. The cylinder piston rod drops 0.2mm when it rotates counterclockwise for one circle. In the case of long-term bending or irregular sheet metal, if there is an error in the parallelism between the slider and the worktable plane, the hexagonal tube can be removed and the worm of any cylinder worm box can be manually adjusted (the error distance of parallelism needs to be found before adjustment). After the adjustment is correct, the synchronization shaft is connected.

(2) Adjustment of the clearance of the machine tool guide rail
The machine tool is equipped with a guide rail seat, guide rail, adjustment iron and adjustment screw at both ends of the slider. The guide rail seat is fixed on the slider, and the guide rail is connected to the column. When the machine tool is frequently used, the gap between the guide rail seat and the guide rail increases. Please use a wrench to adjust the screws, but do not adjust them too tight to avoid damaging the guide rail seat and the guide rail.

(3)Pressure adjustment of the machine tool
Ordinary machine tools have a bending pressure table installed on the right side of the column of the machine tool. When bending, please refer to the table to select the mold notch and adjust the pressure (the maximum pressure of the machine tool is 25Mpa, and the rated pressure is 31.5Mpa). If it is a 51 CNC machine tool, the CNC system can automatically calculate the bending pressure and the bottom dead point position according to the actual workpiece shape. In theory, no manual calculation and adjustment are required. However, since there are many factors that affect the bending accuracy, each batch of bending angles needs to be repeatedly debugged through the program until it is debugged to the bottom dead point position and the bending requirements.

(4) Machine tool molds and splints
Our company's bending machine can install standard upper and lower molds according to user needs and the actual situation of the machine tool. The upper die is equipped with a die clamp, which has three forms: one is a direct-connected upper die configuration, which has a simple configuration structure and low cost. It relies on adjusting the deflection compensation of the lower crossbeam to achieve the bending requirements. When installing, it directly clamps the upper die and links the slider; the second is the upper die configuration with ordinary inclined iron compensation clamping; the third is the upper die configuration with inclined iron compensation and quick clamping. (As shown in the figure)

(5) The clamping configuration structure has the following characteristics:
a. When installing the upper die with ordinary clamping, pay attention to the upper die slipping to prevent personal injury.
b. The ordinary clamping inclined wedge type and the quick clamping inclined wedge type can adjust the compensation amount of the non-parallel upper die and lower die to achieve the basic optimal effect of the bending angle.

2. Preparation before trial run:

(1) Be familiar with the contents of the manual, understand the chain structure, operation method and safety maintenance precautions of the machine tool.

(2) Clean the oil tank before refueling. No impurities are allowed in the oil tank. When refueling, unscrew the nut of the air filter on the oil tank cover, and inject filtered new hydraulic oil (see the oil gauge) (the filtration accuracy of the oil dispenser shall not be less than 5um) until the oil level reaches more than four-fifths of the position indicated by the hydraulic gauge. Mobil AFT-25 hydraulic oil can be used for better results. In winter, when the temperature is low (about 5 degrees Celsius), it is recommended to use YB-N32 anti-hydraulic oil.

To ensure the long-term service life of electrical and hydraulic components, the following requirements are made for the operating and storage environment:

It is generally recommended not to operate the machine tool at low temperatures (below minus 5 degrees Celsius). If it must be used, the machine tool must be operated under no-load for a period of time. If necessary, a cylinder heater can be installed in the circuit. The temperature required for the use of the electrical box shall not be lower than 5 degrees Celsius. If it is lower than 5 degrees Celsius, the electrical box must be in the "on" state so that the electrical components and circuits can be in a normal temperature environment. The maximum temperature shall not exceed 50 degrees Celsius. Under normal working conditions, the oil temperature should not exceed 70 degrees Celsius. Otherwise, a cooler should be installed according to the actual situation, with a relative temperature range of 20% to 75%.

(3) Add lubricating grease to the moving parts according to the lubrication label (generally install an oil ring or oil nozzle on the lubrication part).

(4) Turn on the power (do not start the oil pump motor first), and check whether the hydraulic valves and related electrical components are operating correctly according to various process specifications and related operating methods.

3. Machine tool test run and operation

(1) Slider idle run test

After turning on the power, start the oil pump motor and check whether the rotation direction is correct. Otherwise, swap any two power lines: After the slider jog specification moves normally, make the slider move continuously within the specified slider travel range, and then use the foot switch for a single operation.

(2) Movement of the back gauge
a. For ordinary machine tools, after the slider of the machine tool moves according to the regulations, press the two buttons on the operating surface to control the front and rear of the back gauge and make sure that the digital display on the display is consistent with the actual bending size. If there is a loss difference, it can be adjusted by pressing the handwheel installed in front of the workbench to make the digital display consistent with the actual number (because the screw is an ordinary screw, it is necessary to frequently check whether the actual distance from the stop rod to the center of the mold is consistent with the digital display).

b. During the load test, select the V-groove opening according to the operating instructions, and bend the sheet metal, with the load from small to large until full load.
4. Inspection before use
Before using the machine, first inject hydraulic oil into the oil tank and observe the oil mark. The hydraulic oil should occupy more than four-fifths of the oil mark space.

Fill all lubrication points with corresponding grease or lubricating oil, see the lubrication of the machine for details.
Check whether the center line of the upper die is symmetrically coincident with the center of the lower die. If not, see the adjustment of the machine for details.
Determine the thickness of the bending plate and the opening of the lower die. Generally, the opening of the lower die is selected to be eight or ten times the thickness of the bending plate.

5. Use of the machine
Before using the machine, hydraulic oil must be injected and each lubrication point must be lubricated. Hydraulic oil should be replaced every six months to one year depending on the specific usage. When using the machine, you should first check the machine's movement by jogging, and then perform single and continuous movements. When all parts of the machine are checked to be normal, you can perform the following operations:
(1) Calculate or check the table to confirm the bending tonnage and the lower die opening size.
(2) Align the center position of the upper and lower dies.
(3) Determine the front (rear) stopper position.
(4) Adjust the stroke module to calibrate and determine the upper limit and the fast and slow speed shift position.
(5) Determine the action specification. (Generally jogging and single).
(6) Test the workpiece pressure, adjust the lower dead center position and the upper die wedge block to make the bending angle meet the accuracy requirements.