Pneumatic Press Brake: Complete Guide, Advantages, Applications & Buying Tips

ByFrancis Pan

Francis Pan

Introduction

If you are choosing a press brake for sheet metal processing and forming, the most likely terms that come to mind when searching websites are hydraulic press brakes or electric press brakes. It cannot be denied that they do have a strong industry foundation in the bending processing industry. However, at the same time, a more cost-effective equipment is rapidly developing in the press brake market, which is the pneumatic press brake machine.

What is a pneumatic press brake?

Definition of Pneumatic Press Brake machine

It’s simple, a pneumatic press brake machine is a press brake that uses an air driven system. It generates power through compressed air, driving the punch to bend metal materials into shape.

From the drive system of the pneumatic press brake, it can be seen that it does not require oil and relies on air compression, so it can achieve cleanliness and hygiene at the same mechanical speed.

Basic structure of pneumatic press brake

Open the pneumatic brake press and you will see these key components:

  • Air compressor: The air compressor is the core protagonist of this machine, providing the necessary air power for the equipment. The types of air compressors are usually divided into piston type or screw type, which can be selected according to different needs.
  • Cylinder: The cylinder is responsible for converting the power generated by air compression into mechanical kinetic energy. The strong air pressure caused it to start operating. The size of the cylinder often determines the bending ability of the equipment, and currently the most common type on the market is the double acting cylinder.
  • Machine tool: Machine tools are used to place and fix metal plates. The surface of the machine tool is hard and durable, supporting all tools during the bending process.
  • Punch and die: The press brake punch applies pressure to the metal material and pushes it into the die. And the die is responsible for shaping, making the metal into the expected shape.
  • Liquid storage tank: It is responsible for stabilizing the pressure fluctuations of the machine and ensuring stable liquid supply.
  • Control panel: There will be a display, switches, and a series of buttons on the control panel. They are used to adjust and modify bending parameters in real time, as there will always be moments of deviation.
pneumatic press brake1
pneumatic press brake1

how pneumatic press brakes work

basic working principle of pneumatic press brake machine

The working principle of pneumatic press brake machine is to form the pressure of bending metal through compressed air. With this pressure, the punch pushes the metal material into the die to bend the metal into shape.

operation guide for pneumatic press brake

Suppose we are operating the pneumatic press brake for the first time, and then our workflow:

  • 1. Connect the air compressor with the machine to ensure smooth supply.
  • 2. Start the machine, and the air begins to be compressed and sent to the cylinder successively.
  • 3. At this time, the air pressure will be higher and higher, forcing the cylinder to start piston movement.
  • 4. The kinetic energy generated by the piston movement is transferred to the press, and the press starts to work.
  • 5. Press down with a punch to squeeze the metal material into the die for plastic bending.
  • 6. After the bending is completed, the air pressure will be released, and the press will also relay back.
  • 7. Check the product quality after the work is completed. In case of any deviation or mistake, rework and rework.

working principle difference from traditional mechanical / hydraulic system

The traditional mechanical system uses mechanical lever / inertia to generate kinetic energy, the hydraulic system uses hydraulic oil to drive, and the pneumatic brake press uses compressed air to provide kinetic energy.

Compared with them, what are the specific advantages and limitations of pneumatic press brakes? We will introduce it in detail in Chapter 4 below.

Advantages and limitations of pneumatic press brake machine

advantages

  • Faster speed: compared with hydraulic press brake, pneumatic press brake has shorter bending time and faster production speed.
  • Low cost: the purchase cost of pneumatic press brake machine is low, which is the most realistic and the most priority when purchasing.
  • Lighter volume: the pneumatic press brake has relatively light weight, simple design and small floor area.
  • Low noise: no matter the pneumatic brake press is started or running, the sound is in a quiet state, which helps to create a comfortable working environment.
  • Higher energy efficiency: the air compression cycle is carried out on demand, which means that the pneumatic compressor will only consume energy during operation. This energy-saving system has higher energy efficiency.
  • Wide range of applications: the pneumatic compressor is flexible in operation and easy to adjust the bending size. It is good at processing a variety of parts and can be used in many industries.
  • Environmental protection: the pneumatic press brake does not need to use hydraulic oil, which avoids oil leakage and reduces the burden of subsequent pollution treatment.

limitations

  • Pneumatic press brake machine is not suitable for processing heavy and wide metal materials.
  • The springback of pneumatic brake press needs to be adjusted through actual operation and press brake tool, so the accuracy may be slightly weaker than that of hydraulic press brake and electric press brake.
  • Air purity also affects the stability of pneumatic bending, and the variables (such as water content) need to be handled in advance
pneumatic press brake2
pneumatic press brake2

Comparison of Pneumatic vs Hydraulic vs Electric Press Brakes

Performance Parameters and Application Differences

Bending force:

Pneumatic press brakes, with their lightweight and fast characteristics, are suitable for processing small and medium-sized metals, which also means that they cannot handle major metal material processing like hydraulic press brakes and electric press brakes.

Bending force ranking: hydraulic > electric > pneumatic

Precision:

The bending process of pneumatic press brakes is of medium precision and suitable for parts with allowable tolerances.

The accuracy of hydraulic press brakes is relatively better, while electric servo press brakes, with their servo control system, have the best accuracy among the three.

Maintenance cost:

  • The maintenance cost of pneumatic press brake is relatively low, making it the most cost-effective among the three.
  • Hydraulic press brakes have the highest maintenance costs due to the need for year-round oil management.
  • Electric press brakes do not require oil management, but the maintenance cost is high, so the maintenance cost is moderate.

Energy consumption:

  • Pneumatic press brakes consume gas, have relatively low energy consumption, and have low economic costs
  • The hydraulic press brake continuously consumes oil, with the highest energy consumption.
  • Electric press brakes consume electricity immediately and have moderate energy consumption.

Applicable plate thickness/material:

Pneumatic press brakes are suitable for thin and light sheets, hydraulic press brakes can process light to thick sheets, and electric press brakes are more inclined towards small and medium-sized sheets that require complex processes.

Comparison of Typical Application Scenarios

Thin and light sheet metal, small batch parts: pneumatic press brake;

Heavy tonnage, mass production: hydraulic press brake;

Medium to large batches of high-precision parts: Electric press brakes are preferred, followed by hydraulic press brakes.

Comparison Table of Advantages and Disadvantages

model

cost

accuracy

Bending force

energy consumption

Applicable materials

Pneumatic bending machine

low

secondary

small

small

Frivolous

hydraulic press brake

high

high

large

large

widely

Electric bending machine

Medium to high

outstanding

secondary

secondary

Medium, heavy

recommended selection scenarios and suggestions

If your project budget is limited and you process light and thin metal sheets, pneumatic press brakes are preferred.

If your project needs to process large tonnage and heavy-duty plates and has strict requirements for parts, hydraulic press brake and electric press brake are recommended.

Typical applications of pneumatic press brakes

Industry coverage

Household appliance industry: can produce thin metal parts that require efficient bending, such as microwave oven chassis, washing machine shells, refrigerator cabinets, etc.

Automotive manufacturing industry: can produce small car shells and brackets, car interior supports, and other components that require flexible deformation.

Hardware manufacturing: can produce easily replaceable parts such as lighting fixtures and small appliances.

Typical Process Examples

Thin plate bending: The process requirement is to bend a metal plate of 0.8-1.2mm to 90 °, and its technology can achieve a surface without visible indentation. The application feature is to facilitate quick module replacement of pneumatic press brakes and achieve multi model switching on a production line.

Complex contour bending: The process requires multiple bends, which are repeated back and forth using a back gauge system. The application feature is convenient for alternating production of small batches and multiple varieties.

Rapid prototyping: The process requirement is to achieve rapid bending and shaping of metal in a short period of time. The application feature is to facilitate the production of products of different specifications in multiple batches.

pneumatic press brake3
pneumatic press brake3

Maintenance guide for pneumatic press brake

key points of daily maintenance

Air source treatment: ensure the purity of the gas, regularly check the use of the filter element, and replace it immediately in case of wear.

Lubrication: according to the manual, lubricate the key working parts of the pneumatic brake press, such as the sliding block and slide rail, to prevent the parts from getting stuck and rusting.

Cleaning: clean the workbench and die in time after the bending operation to avoid affecting the subsequent bending.

Regular inspection: check whether the equipment operates well before daily operation, and send the equipment to an authoritative organization for quality inspection every year to ensure the safety and stability of the equipment.

Common Faults and Troubleshooting Suggestions

Unstable bending angle: This is usually caused by air pressure fluctuations, die wear, and back gauge positioning errors. It is recommended to check if the air pressure of the pneumatic bending machine is stable, check for wear on the bending die, and calibrate the back gauge positioning.

Cylinder leakage: check whether the cylinder seal is complete, whether the solenoid valve is blocked, and check where there may be air leakage.

Slow operation: check whether the supply capacity of the compressor matches the volume consumption of the air storage tank, and whether the gas transportation pipeline is blocked. The pipe diameter shall be optimized in time, and the volume of air storage tank can be increased if necessary.

professional suggestions for improving equipment life and performance

  • Supply stable high-quality air source: ensure the purity of air source by installing gas dryer and cold dryer, so as to prolong the service life of pneumatic press brake.
  • Regular quality inspection and maintenance of equipment: regularly lubricate the equipment, record the maintenance log, and then view the equipment usage.
  • Storage of spare parts: increase the quantity of easily worn parts to facilitate subsequent and timely replacement.
  • Improve the working environment and keep the equipment clean and independent, which is conducive to the stability of operation.

Guide for procurement and selection of pneumatic press brakes

requirements to be specified before purchase

  • Bending tonnage: it is better to select the press brake tonnage corresponding to the material with the maximum hardness to avoid the operating limit.
  • Type and thickness of bending metal material: This determines how much bending force the pneumatic press brake needs.
  • Bending accuracy: high accuracy often needs to be operated by the CNC system in the press brake.
  • Site selection: whether it can meet the environmental requirements of machinery and equipment.

key points of model selection: how to select the appropriate pneumatic press brake model according to the actual needs of the enterprise

1. It is better to benchmark the functions of the model according to the most stringent production requirements.

2. Consider the most cost-effective equipment from the perspective of enterprise budget.

3. In terms of policy, try to select equipment with high environmental protection.

introduction to typical brands and mainstream products in the market

Amada —— excels in providing precision and versatility for metalworking.

HACO —— various styles can meet different market demands.

Baileigh industrial —— known for its high quality pneumatic press brakes.

Wilson tool —— specializes in providing pneumatic press brakes with high durability and ease of use.

Conclusion

Now, you probably have a basic and comprehensive understanding of the pneumatic press brake machine.

As an equipment with high cost performance and good at bending and forming light and small metal materials, pneumatic brake press is like a shining star in the metal manufacturing industry.

In the case of limited enterprise and personal budgets, pneumatic press brake is indeed a very good choice. Although the pneumatic press brake also has its own limitations, for example, compared with the hydraulic press brake and electric press brake, the accuracy of the pneumatic brake press still has some room to improve, but its practicality and environmental protection can still meet many market demands.

If you are more curious about the pneumatic brake press, please contact the customer service and telephone at the bottom of the website. We will answer your questions wholeheartedly.

FAQ

Pneumatic press brake is suitable for light, medium and small materials.

Maximum bending length, maximum bending force, air pressure requirements, daily efficiency

If it is light, medium and small-sized metal processing, the pneumatic press brake can be replaced, but the pneumatic press brake machine cannot be replaced for the production of high-precision, thick and large quantities of parts.

Not suitable. It is recommended to use hydraulic or electric press brakes.

Yes, generally, the pneumatic press brake has CNC system to provide real-time adjustment.

It is not difficult to maintain. No additional maintenance is required for the oil system. However, attention should be paid to the frequency and intensity of use. The gas should be purified regularly to ensure the stable operation of the compressor and cylinder. If necessary, it should be sent to overhaul.

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Francis Pan

Francis Pan

Francis Pan is the Foreign Trade Manager of RAYMAX, with over 10 years of experience in sheet metal fabrication equipment and CNC machinery. He has worked closely with manufacturers worldwide on press brakes, fiber laser cutting machines, fiber laser welding machines, and practical production-oriented metal processing solutions.

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