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Troubleshooting and Repairs CNC Press Brake

Components of Press Burke

  1. Steering control system section
  2. matrix and mandrel
  3. Engine servo and rear position
  4. The body of the system
  5. Lower jaw and upper jaw

Correct repair and service of CNC brake bender

Repairing is very important and vital in terms of safety and functionality. In general, the repair of this device includes the following:

  1. Troubleshoot and repair the device control system
  2. Preventive Maintenance
  3. Set back appointment
  4. Hydraulic system service
  5. Adjust the inaccuracy in the bend

On-site or remote press brake repair training

  1. Oil change / filtration
  2. Synchronization of axes
  3. Drowning system adjustment
  4. Providing bending parameters
  5. Providing factory settings and overhaul
  6. Change the control system
  7. And…

In general, according to the structure of the press brakes, we can examine the vital and sensitive points that need the most maintenance.

The 3 key parts of press brake maintenance are:

  1. hydraulic circuit,
  2. mechanical system,
  3. Control system
  4. Matrix mandrels

Daily procedures for checking and maintaining these areas are often quick and simple. Following these 3 steps can make a significant difference in the bending performance, wear and tear of the system components and the lifespan of the brake press.

Proper maintenance of bending machines is one of the most important tasks to increase the life and efficiency of this equipment. If the part of the steering control system, matrix and mandrel, servo motor and other parts are not properly maintained and serviced for any reason, it will suffer failures and defects such as breakage or cracks on the tool and also cause the jaw to come out of calibration. which will cause a lot of damage and costs.

For an efficient and correct service and maintenance, the following actions must be taken:

  1. Regular cleaning and continuous lubrication program based on the preventive maintenance schedule
  2. Check the quality of hydraulic oil
  3. Checking the Semba and closed matrix on the device with the software
  4. Use of suitable matrix mandrels

Technical inspection in the process of repair and service of CNC press brakes

The process of inspection and press brake is carried out in order to check and identify possible risks and injuries, as well as to check solutions to increase the qualitative and quantitative efficiency of the device. In this process, the health and proper functioning of control equipment such as electric valves, propellant valves, sensors and longitudinal rulers are ensured.

Monthly and annual testing and inspection of press brakes

  1. Inspection of control equipment
  2. Checking and testing the body strength process, rear, front,
  3. Perform a pressure test on the jack
  4. Inspecting the inside of the bending chamber and the rear area
  5. Visit inside the electrical panel and controller system
  6. Checking the correct operation of valves and sensors

Basics of press brake maintenance

Matrix mandrels must be free of depression. Instruments showing signs of this wear should be returned to the instrument manufacturer for evaluation, reconditioning, or replacement.

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Today’s hydraulic press brakes come in a wide range of capacities, from portable 50-ton models to custom machines of 3,000 tons or larger, and with advanced options such as CNC sheet support, programmable tooling, adaptive bending and technologies. user interface are provided. While the modern brake press is more capable than ever, it requires essentially the same level of maintenance as older designs.

  • 1- Take a look around

At the beginning of the shift, inspect the device as the airline captain inspects the aircraft. A visual inspection of all areas allows you to spot and address small issues before they become major problems. Check that the brake press is intact. The surface of the table and mold must be free of any contamination.

If the machine has already been delivered from the previous shift, you should check the alignment of the mandrel and the matrices and check the condition of the laxity of the mandrel and the matrix. Punches and dies must be free of dents to achieve proper fit. Any tool that shows signs of cracking should not be used under any circumstances. Dents and cracks in the tool indicate that the tool has been overstressed and needs repair or replacement. The actual position of the backward finger must be checked and must correspond to the amount of movement of the axis.

Also check the correct operation of all devices, including x and y axis origins and foot pedal control and indicator lights. It only takes a few moments to verify that these devices are working properly, and enough time is spent to ensure that the device is safe to operate.

If there is additional protection, make sure it is set to specifications and is working properly. Any irregularity should be reported to the supervisor immediately and the equipment should be corrected before work. After completing the daily overview steps, it is time to perform specific maintenance tasks.

2-Take precautions

Before performing any maintenance work on the machine’s hydraulics or mechanical system, the machine’s movable jaw must be restrained.

Support concept

  • Keeping moving parts such as the backgauge clean and lubricated is critical to the performance and life of the brake press.
  • The electrical system must be locked to ensure that it cannot be engaged.

3-Check the hydraulic circuit

Hydraulic oil is the lifeblood of the hydraulic system, especially the bender. It is very important to keep the oil clean and fill the tank to capacity. As you check your car’s oil level, periodically check the oil level in the reservoir. This is a simple visual check that can easily be done daily. Insufficient oil level will cause irregular operation of the upper jaw and damage the hydraulic pump or at least shorten the life of the pump.

If the press brake is equipped with a hydraulic cam system for clamping the mandrel and matrix, check this oil level periodically as well. This system is usually a separate hydraulic system with its own oil level indicator. Again, this is a simple visual check.

Make sure the brake press jacks are in the up position to make it easier to check and adjust the oil level and prevent the hydraulic reservoir from overflowing.

Dirt particles may enter the hydraulic circuit due to insufficient sealing. Make sure tank cover gaskets and vents are in good condition. Air vents are installed on the tank cap and allow air to flow through the tank when the cylinders are pumping oil, preventing a vacuum in the tank.

If there is dirt in the oil, there may be problems and irregularities in the operation of the pump and valves. In fact, most of the hydraulic circuit problems are related to contaminated oil. Contamination in the system can cause the valves to get stuck in the open and closed position and damage the pump system by causing a gradual pressure drop.

Check the quality and viscosity of the oil every 2000 hours of operation. To do this, take an oil sample and have it analyzed by your oil supplier. The supplier will be able to provide full specifications on the condition of the oil and therefore recommend an oil change or filter.

4. Checking the mechanical equipment of mechanical lorki brake presses

· The mechanical components of a brake press — the piston pin, sprockets and guides — should be checked at least twice a year.

· Check the connection between the piston and the ram regularly. Check all screws and bolts for tightness. If the screws are loose, check their condition by unscrewing them. If the bolts are stretched, replace them.

Modern press brakes require lubrication at a minimum number of points that are easily accessible. Keeping moving parts such as tailstock, slide guide systems, and ball screws clean is critical to the performance and life of the brake press.

Components that require weekly lubrication are:

· ROM guidance system (sliders)

· The front carriages hold the sheet

· ball screw

· Guides and rails at the back

It is important that the type of lubrication used is in accordance with the equipment manufacturer’s specifications. Avoid excessive grease, which will only cause unwanted build-up and contamination of components.

Also, part of the maintenance of the mechanical system is the adjustment of the sliders of the device.

Maintain proper spacing between sliders. Too much distance causes inaccuracy in maxillary rotation. Lack of sufficient distance causes excessive heat on the parts. The distance must be adjusted according to the manufacturer’s specifications, which are different depending on the brake press model. This adjustment should be done by a qualified technician.

5. Check electrical equipment

All electrical connections on the main panel of the brake press as well as all electrical switches should be checked annually.

When performing such repairs on the electrical system, turn off the main power switch and lock the system if possible. Certain checks should be performed with the system powered up. In these cases, be sure to follow all precautions. Be careful when disassembling or reassembling press parts. Disassembly must always be done in a clean environment.

To maintain the electrical components of the device:

· Check all connections of terminal strips, relays and terminal boxes on motors.

· Reseat all printed circuit boards and check for physical damage (cracked solder points, burnt parts, etc.).

· Check all input voltages from power supplies and transformers.

· Check all cables and switches for damage or defects.

· Check the fans for operation.

· Check the operation of all machine functions and safety features (electronic stops, two-hand controls, etc.).

· It is very important to maintain the internal panel temperature within the range specified by the manufacturer. Keep the internal and cooling fans and filters of the air conditioning system or heat exchanger clean. Keep the switchboard doors closed. This is a simple step that is invaluable in ensuring that electrical components are free of contaminants.

6. Inspect the tool

Not all tools can be kept the same. For example, fabricators typically harden and stone the matrix mandrel. However, press brake tools should only be sharpened or refinished by the tool manufacturer.

To maximize press break tool life, select the right tool for the application. Tool life depends on the nature of the material being bent. Stylish sheets and heavy materials can significantly shorten the life of the tool because these materials do not bend easily during bending and cause tension on the tool, thereby wearing it out.

Keep the tool clean and free of lint and visually inspect the tool each time before use. Tools that are cracked or damaged in any way must be returned to the tool manufacturer for evaluation, repair or replacement. Using tools that have dents or cracks can expose both the machine and the operator to serious injury.

How much is the cost of press brake service or automatic cnc bender repair?

This question is almost incomplete and it is not possible to specify this item accurately. The expert can announce the cost after visiting the device in person. In some cases, the problem will be solved with a minor check and repair. If there is a need to replace a part, it will be specified and announced by the expert.

How repeatable are automatic cnc bending failures?

Reproducibility of failure also depends on the amount of use of the device. If the machine is used for several shifts, maintenance must be done every three months.


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