Press Brake Maintenance: The Ultimate Guide

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The maintenance of the press brake helps to prolong the service life and reduce the cost.

The maintenance of the press brake is mainly divided into several parts, including the hydraulic system, mechanical part, lubrication part, electrical equipment and toolings.

The daily maintenance of the press brake is trivial but relatively simple.

Once the daily overview procedures are done, it's time to tackle specific maintenance tasks.

Importance of Regular Maintenance

As we all know, the press brake's service life depends on the product's quality.

But it also depends on the user's maintenance measures.

Regular maintenance is not only to prolong the service life of the press brake.

It can also eliminate faults, and reduce the workpiece damage rate as well as the potential danger to operators.

A detailed periodic maintenance plan should be developed and documented in a form.

Both press brake operators and maintenance personnel need a professional training.

Regular maintenance can find the faults of the press brake in time and avoid expensive maintenance costs.

This article will introduce several important aspects of press brake maintenance.

Overall Inspection

Before using the press brake, first, check the overall condition of the machine.

Check whether there are residues on the tooling areas and workbench.

Check the matching condition of the upper dies and the lower dies for defects and cracks.

If the dies of the press brake have cracks, it will affect the bending quality of the workpieces.

Test whether the position of the back gauge and the stop finger is accurate.

Also test whether all buttons, switches, indicator lights and foot controls are sensitive.

These can be operated as routine inspection items before each use of the press brake.

In addition, special maintenance of some important parts shall be carried out.

Hydraulic Circuit

Hydraulic oil is the energy source of the hydraulic system.

It is important to keep the oil and hydraulic circuits clean.

The hydraulic circuit includes the oil tank, valve group, pipeline, motor, oil pump, etc.

It is not recommended to use detergent when cleaning valves, oil tank covers and related accessories.

Also, visually check whether the oil level in the oil tank is within the safe range every day.

Otherwise, the operation of the hydraulic pump will be affected, resulting in insufficient power to drive the ram.

Make sure that the oil tank is properly sealed and ventilated.

However, the oil tank cannot be completely sealed, and breathers are required to prevent the oil tank from generating a vacuum.

The seal is designed to prevent particles from entering the tank to contaminate the oil.

The contaminated oil will block the valve and damage the hydraulic pump, thus affecting the operation of the hydraulic system.

Hydraulic fittings

Check all pipes and hoses for leakage, especially the hydraulic pump and connecting accessories.

In case of expansion of oil hose and aging and wear of pipeline, it shall be replaced in time.

Check the cylinder assembly, valve and hydraulic block for leakage.

If there is too much oil on the piston, it is necessary to wipe it clean and keep proper oil for lubrication.

Check the maximum pressure of the pump and relief valve.

Clean the oil tank and filters

It is necessary to clean the oil tank and filter before replenishing the oil

The filters of the oil inlet and outlet holes of the oil pump should be cleaned.

The air breathers on the oil tank need to be cleaned with compressed air.

The filter and air breathers need to be replaced after certain service life.

The oil temperature should not exceed 60 degrees, otherwise, it will affect the stability of the oil and damage the accessories.

The cleanness and level of the oil

Using the oil type recommended by the manufacturers to ensure the cleanliness of the oil.

Check the oil level in the oil tank every day. An electric pump is required to fill the oil.

The quality and viscosity of the oil should be checked every 4000 to 6000 hours of operation.

Mechanical Components

The mechanical part of the press brake needs regular inspection to ensure the stability of all parts.

Tighten all bolts, nuts and screws regularly, and check the connection between the piston and the ram.

Check whether the connecting part of the base has cracks.

Check whether the back gauge and stop finger are in good condition, otherwise, recalibration is required.

Lubrication System

The lubrication of press brake parts is an important link to prolonging the service life of the machine.

Some parts of the press brake are used to slide, roll, or are under friction.

While lubricant can reduce friction between parts and decrease the damage to components.

Parts requiring regular lubrication and cleaning include ball screw, guide rail, back gauge, gear, etc.

Lubricate at least once a week, and some parts even need to be lubricated every day.

However, do not over-lubricate, otherwise, it will cause too little friction or pollution of components.

Remember to clean all components before applying lubricant or grease and use the lubricating products recommended by the manufacturer.

Electrical Equipment

The maintenance of electrical equipment is the top priority to prolong the service life of the press brake.

Check the entire electrical system at least once a year, including all electrical connections and switches.

Before the inspection, it is necessary to turn off the main power switch, and other inspections can be carried out after the power is on.

Keep the components in a clean and safe condition when assembling electrical components.

Check the connection status of the terminal boxes and terminal strips on the monitor and relay.

Check whether all wires are loose, whether insulation is damaged, and whether the wires are clean and orderly.

If it is loose, tighten the wires and clean them with a clean cloth or compressed air.

Check the air filter of the electrical cabinet and inverter box and clean it with compressed air.

Check all cables, printed circuit boards and switches. If there is damage or fault, repair and replace them.

Check whether the limit switches and voltage are in good condition.

Keep the cooling fan and heat exchanger filter clean and in normal operation.

Check whether the external panel of the electrical box is turned off and whether the switches, lights and other functions work normally.

Tooling System

A press brake is a machine used to bend different sheet metals.

The punch and die of the machine will directly contact the plate, so the material of the die is particularly important.

The material of the workpiece also needs to be considered for the material with rolling chips will wear the die.

After use, the punch and die need to be maintained regularly to avoid rust and corrosion.

After each use, wipe the punches and dies with a clean lint-proof towel and alcohol.

This is done to eliminate fingerprints. The pH of the hands will corrode the die surface.

Then wear gloves to apply anti-corrosion lubricant to the punches and dies.

Finally, put it into the toolbox and at put least one bag of silica gel in it.

If the punch or die is damaged, it needs to be replaced.

Conclusion

Regular maintenance of the press brake is an effective way to prolong the service life of the machine.

The maintenance of the press brake includes the maintenance of the hydraulic circuit, hydraulic accessories, tooling system, and electronic accessories.

There is also the lubrication of mechanical parts, guide rails, back gauges, axes, ball screws, and other parts, as well as the cleaning of the foundation.

ADH is a professional manufacturer of press brakes, including CNC press brakes, NC press brakes, etc.

We also provide professional after-sales service. If you have any problems with your press brake, you can contact our after-sales team.

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