If someone decides to buy press brake, they will get confused by CNC press brake or NC press brake. There are numerous differences between the two presses brake machines. We will be sharing some key tips on how to differentiate CNC press brake and NC press brake. We hope it will be useful to you as you begin your venture. We will actually identify the torsion-bar type press brake "NC Press brake" and call it Electro-hydraulic type press brake "CNC press brake".
Difference
Structure
The principle of design for the two machines differs, and it results in the different synchronous structures on both sides of the ram. To connect both rams together, NC press brake uses an torsion shaft. This forces the ram to move either up or down in the same time. NC press brake also employs the compulsive and synchronous mechanical way. The ram's parallelism can't therefore be checked and adjusted by the machine. For the CNC Press brake two linear encoders are installed on the machine both sides and the CNC controller is able to analyze the synchronous state on both sides of the ram through the feedback of both linear encoders. If there's an error, the controller can make the adjustment by the proportional valve in order to maintain the constant synchronization of the ram. CNC controller along with the hydraulic system as well as the linear encoders are part of the closed loop control system.
Accuracy
The ram's parallelism affects the precision of the workpiece. The NC Press brake synchronization is kept mechanically and it has no real time feedback for the error. What is more, it can not adjust by itself, and can result in low bending precision. The torsion-bar forces both cylinders to move in synchrony both up and down on the NC press brake. When the partial load remains for a long period of time, it will cause the deformation for the torsion bar. For CNC press brake for sale the controller controls the synchronization of the ram by both proportional valves and the linear encoder will send feedback on any error back to the controller. should there be an error the linear encoder sends the feedback to the controller and will send the signal to the proportional valve in order to make the adjustment and ensure that the ram remains synchronized and improve the bending precision.
Speed of work
When it comes to the press brake, we're always discussing three speeds: down speed, working speed and return speed. For NC Press brake it will be using a an 8:1 or 6:1 cylinder. for the CNC Press brake it will be using 13:1 or 15:1 cylinders, so CNC press brake can work more quickly than NC press brake. When NC press brake ram goes down, its down speed is around 80mm/s, the backgauge's moving speed is approximately 100mm/s. But for CNC Press brake, its ram down speed can be as high as 200mm/s. It can also move extremely quickly during the speed change point. Its backgauge speed is up to 400 mm/s. This will boost efficiency.
Mechanic rigidity
Due to its design, NC press brake can not bend by partial load. The torsion bar is able to be able to deform when it is employed for a prolonged period of duration. It will not happen when you use CNC press brake for sale, as the Y1 Axes and the Y2 Axes be working independently.
Crowning system
In the majority of NC press brake models, it won't come with crowning system as standard. The operator needs to alter the bending angle manually prior to bent the product. It is laborious and will waste materials. Additionally, it will be extremely difficult to manufacture the product with precision.
Sometimes, the customer may also choose to add a manual crowning system as optional element of their press brake. However, due to the manual operating system can't be compared to it to a CNC press brake. The CNC press brake is equipped with the crowning system that is controlled by the controller. It will adjust the crowning system in accordance with the bend parameters. This will improve the operation effectiveness and precision.
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