NC Press Brake VS CNC Press Brake: What Are The Differences?

A press brake is a machine used to bend or form metal by pressing it between two dies. The force required to do this is provided by a hydraulic cylinder, which is activated by a foot pedal or hand lever. Press brakes are available in a variety of sizes, and can be used to create simple or complex shapes. They are an essential tool in many industries, such as automotive, aerospace, and construction.

Sometimes a buyer of a press brake will get CNC press brake(computer numerical control) and NC press brake(numerical control ) mixed up. There are numerous distinctions between the two press brake machines. The difference between a CNC press brake and an NC press brake are as discussed below.

The difference between NC press brake and CNC press brake

NC Press Brake WC67Y
NC Press Brake WC67Y
CNC Press Brake WE67K
CNC Press Brake WE67K

There are two main types of press brakes – NC and CNC press brakes. NC press brakes are operated via a numeric control panel. This panel allows the operator to input specific values that determine the position of the ram and the speed of operation.

CNC press brakes are operated via a computer interface. This allows the operator to input specific values that determine the position of the ram and the speed of operation. Both NC and CNC press brakes offer advantages and disadvantages.

Structure

The main difference between the two types of press brakes is their frame structure. A CNC Press Brake has a monoblock design that gives it more rigidity and strength, while an NC Press Brake has a cantilever design that makes it more versatile.

Due to the various design principles of the two machines, the synchronous structures on both sides of the ram are distinct. Since NC press brakes use a torsion shaft to mechanically link the ram’s two ends and make them rise and fall in lockstep, the ram’s parallelism cannot be checked or adjusted automatically.

The CNC controller of a press brake can determine whether or not the ram is moving in sync on both sides thanks to the information provided by two linear encoders positioned on each side of the machine. When an error is detected, the controller will make the necessary adjustment via the proportional valve to maintain ram synchronization. Closed loop control systems often include a CNC controller, hydraulics, and linear encodes.

Accuracy

The precision of the finished product is impacted by the rams’ parallelism. The NC Press brake’s bending precision suffers since its synchronization is maintained mechanically; the brake cannot detect and correct errors in real-time. Torsion bars on NC press brakes make the cylinders rise and fall at the same rate.

When a torsion bar is subjected to a partial load for an extended period of time, it will undergo deformation. To improve the bending accuracy of a CNC press brake, the controller will use a linear encoder to monitor the ram’s position and a proportional valve to maintain ram synchronization. If an error is detected, the controller will send a signal to the proportional valve to correct the situation.

Working Speed

There are three points in the operation of a press brake that will determine how fast it works: down speed, working speed and return speed. For NC press brake, it will use 6:1 or 8:1 cylinders, and for CNC press brake, it will use 13:1 or 15:1 cylinders, so the CNC press brake works faster than the NC press brake.

When the ram of  NC press brake descends, its descending speed is about 80 mm/s and the back gauge moves at about 100 mm/s, but for CNC press brake, its ram will descend at 200 mm/s, it can move very smoothly at the speed change point and the back gauge speed can reach 400 mm/s, which will significantly improve the work efficiency.

Crowning System

NC press brakes rely on a mechanical Crowning system to evenly distribute pressure along the length of the die, while CNC press brakes use hydraulic cylinders to apply pressure at specific points. Crowning systems can be less precise than hydraulic cylinders, meaning that NC press brakes may not be able to produce parts with as tight tolerances as CNC press brakes.

However, Crowning systems are typically less expensive to maintain than hydraulic cylinders, making NC press brakes a more budget-friendly option. Ultimately, the best choice for you will depend on your specific needs and preferences.

CNC Axis

CNC press brakes offer increased accuracy and repeatability, as well as the ability to produce more complex parts. In addition, CNC press brakes offer the ability to program multiple CNC axes, which allows for more precise bending and forming operations. As a result, CNC press brakes are able to produce parts with tighter tolerances and higher levels of accuracy than traditional NC press brakes.

Mechanic Rigidity

NC press brakes are more rigid than CNC press brakes, so they’re better suited for heavy-duty applications. However, they’re also more expensive and require more maintenance. CNC press brakes, on the other hand, are less rigid but more precise. They’re also easier to use and require less maintenance. Ultimately, the decision of which type of press brake to choose depends on your specific needs.

Optional Configuration 

CNC press brake is a computer-controlled machine that automatically bends the metal sheets according to the programmed bend parameters. Both NC press brake and CNC press brake can be equipped with optional configurations, such as back gauge, light curtain, etc.

Optional configurations help to improve the productivity and accuracy of the machine. For the NC press brake, we will use a mechanical fast clamp, ball screw and linear guide, manual crowning system, oil cooler, manual height adjustment Z stopper, and light curtain.

For the CNC press brake, however, we have a wider variety of options, including hydraulic clamp, a double-face clamp, sheet follower, robotic arm, laser angle measurement, laser protection, and a servo pump unit.

Conclusion

There are two main types of press brakes: NC press brakes and CNC press brakes. Both have their own advantages and disadvantages, so it’s important to choose the right type for your needs. NC press brakes are more affordable than CNC press brakes, but they’re also less precise. NC press brakes use hydraulics to create the bending force, which can be difficult to control. As a result, NC press brakes are best suited for simple tasks that don’t require precision.

CNC press brakes, on the other hand, are more expensive but offer greater precision. CNC stands for computer numerical control, which means that the machine is controlled by a computer. This allows for much more precise bending, making CNC press brakes ideal for complex tasks.

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