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Press brake is a mechanical or hydraulic machine for bending sheet metal and plate material, which is common in engineering workshops. Press brake requires different methods of approach to achieve the desired results. From forming wind tower poles to intricate electrical cabinet components, press brakes are a vital tool.

• What are the common faults of press brake?

• How to avoid electric leakage when the press brake is working?

• Why there are errors when using press brake?

What are the common faults of press brake?

Press brake makes poor surface roughness of the workpiece. The tool tip of the press brake is damaged that is not sharp. The press brake resonates leading to the unstable placement. The press brake has a crawling phenomenon, resulting in poor processing technology.

The workpiece produces taper-size head. The level of the press brake is not adjusted properly that one side is high and the other is low, resulting in uneven placement. When turning the long shaft, the material fed is too hard to be cut deeper. The tailstock thimble and the spindles are not concentric.

The size of each workpiece is inconsistent. The carriage of the press brake runs at high speed for a long time, resulting in the wear of the screw and bearing. The repeated positioning accuracy of the tool holder produces deviations during long-term use. The carriage can accurately return to the starting point of processing every time, but the size of the processed workpiece is still changed. It is generally caused by the main shaft, caused by the high-speed rotation to wear.

How to avoid electric leakage when the press brake is working?

For the press brake, it is inevitable that there will be leakage in the working process. If the leakage is not handled in time, it will damage to safety.

In order to avoid the occurrence of electric leakage when the press brake is working, the press brake must be equipped with a leakage protector, it is a current-driven leakage maintenance device, which has a good effect on the protection of the press brake.

When operating the press brake, if the insulation of the electrical installation equipment is damaged, the cover will be charged. The correct grounding and zeroing work must be done. The electrical installation of the press brake should be maintained with high-voltage grounding to reduce the risk of electric shock.

The wiring operation of the press brake is also very simple. It is enough to connect the metal shell and the common maintenance neutral line firmly. Lead out from the neutral line on the power side of the leakage maintainer. Under the protection of its maintainer, the press brake can maintain a good and stable situation.

Why there are errors when using the press brake?

The outer circle of the bend is a cone. The connection between the front and rear centers is not coaxial with the spindle axis, which is caused by the wrong position of the tailstock center of the press brake.

The workpiece vibrates when bending. It may be that the tailstock sleeve of the press brake extends too long or the support of the workpiece is too loose. The mold is not sharp enough or the arc is too large. The bearing clearance of the rotary center is large. The clearance of the medium and small sliding plates is too large.

The mold does not meet the requirements. The mold and the main shaft axis of press brake are not on the same axis. The circular runout caused by the wear of the bearing. The center hole of the workpiece is not cleaned or is fuzzed. The center hole does not work because the lever in the center of the mold touches the end face of the chuck.

Learn more about press brake can know the faults of press brake. LZK CNC Machine Tool(Anhui) Manufacturing Co., Ltd. is equipped with many professors and advanced equipment.

All operation of press brake must be carried out by qualified and experienced operators with signs posted. Do not put hands or other parts of the body between the press brake. Use the right press brake for working at heights without risk.

• What should be prepared before using press brake?

• How to operate press brake?

• What are the warnings when using press brake?

What should be prepared before using press brake?

When operating the press brake, in order to prevent the occurrence of problems, the preparations must be carried out.

Clean the oil stains on the appearance of press brake. The engraved line on the stop valve should be in the open position.

Turn on the press brake for a few cycles, ensuring that there are no abnormal conditions. Try cutting different thickness sheets. During trial cutting, the gap between the different blades must be adjusted because the thickness of the plate is different. Otherwise, the durability of the blade will be affected.

During the cutting process, turn on the pressure gauge and check the oil pressure value. If any abnormality, the relief valve can be dispatched to meet the specified requirements.

When operating the press brake, if abnormal noise or overheating of the oil tank is found, the press brake should be stopped and checked. The high temperature of the fuel tank does not exceed 60 degrees.

How to operate press brake?

Turn on the press brake power and the key switch on the control panel. Then, press the oil pump to start.

The press brake must pay attention to the adjustment stroke. Be sure to test before operating. When the upper die of the press brake descends to the bottom, there must be a gap of plate thickness. Otherwise, it will cause damage to the mold and the press brake. The stroke adjustment also has electric quick adjustment and manual fine adjustment.

For the selection of bending notches, a notch with a width of 8 times the thickness of the plate should generally be selected.

Backgauge adjustment generally has electric quick adjustment and manual fine adjustment, which is the same as the shearing machine.

Step on the foot switch to start bending. You can release it at any time.

What are the warnings when using press brake?

Before operating the press brake, check whether the motor, switch, circuit and grounding are normal and firm. Check that the control parts and buttons of the press brake are stuck in the correct position.

Check the firmness of the upper and lower molds that whether each positioning device meets the processing demands.

If the upper slide plate and each positioning axis are not at the origin, run the return-to-origin program.

After the press brake is started, run idling for 1 to 2 minutes, and move on the skateboard 2 to 3 times at full stroke. Troubleshoot the malfunction until press brake is normal.

The operator should be in uniform command, cooperating closely with the feeding and suppressing operator.

Learn more about press brake can know the operation of press brake and the warnings of press brake. LZK CNC Machine Tool(Anhui) Manufacturing Co., Ltd. is the leading manufacturer and exporter in China. It is wise of you to choose as your partner.

The shearing machine cuts sheet metal, plates, bars, and tubing of various cross-section into pieces by subjecting to shear force. It typically uses a punch and a die, which may be of any shape that is similar to a pair of scissors. Both the shearing machine and the laser cutting machine can shear the plate.

• What is the difference between shearing machine and laser cutting machine?

• What is the difference between gate-type and swing-type plate shearing machine?

• Which shearing machine can be viewed as high quality?

What is the difference between shearing machine and laser cutting machine?

Laser cutting machine is a piece of blanking equipment, which can cut boards of any shape, including straight, line and curve, holes and complex geometric figures. The laser cutting machine uses a focused high-power density laser beam to irradiate the workpiece to quickly melt, vaporize, ablate or reach the ignition point of the irradiated material. At the same time, the molten material is blown away by the coaxial high-speed airflow of the beam to cut workpiece. The incision of laser cutting machine is high but small without burrs. The cutting speed is based on the thickness of the steel and the power of the laser.

Shearing machine is a straight-line machine, which is mainly used to cut the straight edge of various sizes of metal plates. Although shearing machines are also blanking equipment, they perform simple shape cutting. Shearing machine is widely used in various industrial sectors such as steel rolling, automobiles, ships, tractors, bridges, airplanes, electrical appliances, instruments, boilers, and pressure vessels. The steel plate cut by the shearing machine has low degree, large cut and high roughness with burrs at a slow cutting speed. The cutting quality decreases more according to the thickness of the material.

What is the difference between guillotine and swing-type plate shearing machine?

The guillotine shearing machine is used in industries such as automobiles, tractors, rolling stock, ships, motors, and instruments. It is also suitable for stretching work of various high-strength alloy plates. The guillotine shearing machine adopts an integral welded-frame structure and has vibration treatment so that is has good rigidity, high precision and good precision retention. A three-point supporting shaft rolling guide rail is adopted that the upper tool holder rolls between the rolling guide rails without gap. The lifespan is determined by turning the hand wheel. The movable blade base and the four-edged long blade are convenient to adjust the uniformity of the blade gap, improving the cutting quality and extending the lifespan. The guillotine shearing machine uses tandem cylinder synchronization system with even force. By adjusting the flow rate of the tandem cylinders, the shearing angle can be easily to meet the needs of different shear plate thicknesses.

The swing-type plate shearing machine is used in the stretching, bending, extrusion, forming and other processes of metal sheets in the power industry and aviation industries. Compared with guillotine shearing machine, swing-type plate shearing machine mostly adopts oblique-blade, which is widely used due to simple structure, low failure rate, and high efficiency. As the tool holder rotates, the shearing angle and gap will change.

Which shearing machine can be viewed as high quality?

Relying on the guide rail, the shearing machine can realize intelligent movement. The cutting length and thickness are not limited by the size of the shearing machine. Even the guide rail can be lengthened as needed.

The shearing machine replaces manual feeding and adopts heavy-duty robots, which can load 5 tons at a time. It saves manpower and effectively avoids safety accidents.

The shearing machine has zero loss during the cutting process. The feeding platform can automatically flip the steel plate. In addition to eliminating manual operations, it also avoids the material waste caused by the long steel plate. During the operation, no pollutants are generated.

Learn more about shearing machine can know the difference between shearing machine and the laser cutting machine. LZK CNC Machine Tool(Anhui) Manufacturing Co., Ltd. can help you know more about the CNC machines.

An efficient press brake is fundamental to avoiding damages and detecting failures. Keeping press brake clean and tidy is simple but important. It should be done the daily, weekly, monthly, and yearly.

• Why does press brake leak oil?

• What should you do for oil of press brake?

• What is the role of oil of press brake?

Why does press brake leak oil?

The sealing ring is not suitable for the conditions of using press brake. The O-shaped rubber seals often used in press brake must be selected according to the operating conditions and working conditions. Under oil lubrication conditions, the hardness of the oil-resistant rubber O-ring seal can be low hardness when the oil pressure is less than 2.9MPa. When the oil pressure is 2.9 to 4.9MPa, medium hardness should be selected. When the oil pressure is 4.9 to 7.8MPa, select high hardness.

There is no design seal or unreasonable seal structure. The screw hole on the body of the press brake is designed as a through hole with no sealing measure. The press brake cover is not designed with a gasket. The clearance between the shaft and the body hole is too large. The interference between the sealing ring and the shaft does not meet the requirements. The design of sealing groove is unreasonable.

Oil leakage can be caused by casting defects and parts damage. The castings of the press brake have defects such as blisters, pores, cracks, and loose tissues. When the oil pipes and pipe joints of the press brake are made of plastic or oil-resistant rubber, the materials will age to become hard and brittle after long-term use. The moving parts will lose the sealing performance due to friction and wear. If the gap between the shaft and the shaft hole increases, it will also cause oil leakage.

What should you do for oil of press brake?

Before maintaining or cleaning, the upper mold should be aligned with the lower mold. Shut down until the work is completed. If you need to start press brake, select the manual mode to ensure safety.

Check the oil level of the oil tank every week, even after the hydraulic system is repaired. If the oil level is lower, add hydraulic oil. The oil should be changed after 2000 hours of operating new press brake. Afterwards, the oil should be changed after 4000 to 6000 hours of operating press brake. The oil tank should be cleaned every time before changing the oil. The oil temperature of the press brake should be between 35℃ and 60℃ that is not exceed 70℃. Otherwise, it will cause deterioration and damage of the oil quality and accessories.

The filter of press brake should be replaced or thoroughly cleaned every time if the oil is changed. If the press brake has filter abnormalities such as unclean oil, the filter should be replaced. The air filter on the fuel tank should be inspected and cleaned every 3 months and replace every year.

After using the new press brake for one month, check whether the bending of each oil pipe is deformed. After two months of use, all fittings should be tightened.

What is the role of oil of press brake?

The oil of the press brake plays the role of transmission, wear resistance, system lubrication, anti-corrosion, rust prevention, and cooling in the hydraulic system. It belongs to the industrial hydraulic system. The hydraulic oil itself is constantly changing in use. However, it is difficult to completely solve the problem of hydraulic oil pollution.

Serious oil pollution will directly affect the performance of the press brake. It will cause frequent failures of the brake system and shorten the lifespan of press brake.

The main reason is the particles in the dust. As far as hydraulic components are concerned, these solid particles entering the components will increase the wear of the sliding parts. In addition, it may block the orifice, the orifice in the hydraulic component, or the spool stuck, causing the hydraulic system to malfunction.

The mixing of water and air reduces the lubrication of hydraulic oil, accelerating the oxidation of hydraulic oil and producing cavitation corrosion.

Learn more about press brake can know the reasons for oil leakage of press brake and how to deal with oil of press brake. LZK CNC Machine Tool(Anhui) Manufacturing Co., Ltd. can offer you better experience whether in terms of products or delivery.

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High Speed Steel (HSS) Single

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