What is CNC Press Brake and Tips to Choose This in a Right Manner.
CNC press brakes handle the bending in a production process of Computer numerically controlled (CNC). They are also known as CNC brake presses. This machine is a machine pressing tool used for bending sheets and plate materials and sheet metals by many industries. It has a fixed bottom with the V block tool placed in with a top beam that moves under force with the V blade tools and this process is known as down forming. It forms programmed bends by holding the workpiece between a matching punch and die. Initially, it was invented for pounding and crushing. The term brake was added in the name of the machine as it was derived from the English verb broken, which means to break something or to change the direction. A CNC press brake consists of an electrical control system, oil cylinder, slider, CNC controller, machine frame, and position detection system. CNC press brake gets bending function by regulating slider stroke and back gauge. While using them, you need to set the number of the pieces which are required for bending as well as the bending angle for each step in the controller, the CNC press brake will complete bending as per the mentioned steps in the controller. CNC press brake has high control accuracy, bending accuracy as well as repositioning accuracy. The price of the CNC press brake machine is mainly governed by factors like bending length, bending force, and the control system. Apart from this, the price of the press brake is also affected by other factors, such as market, specifications, brand, category, etc. A brake can be defined by some parameters like force, tonnage, and the working length. The stroke length, the distance to the back gauge, work height, and the distance between the frame upright or side are some other additional parameters. Some of the brakes. There are different types of brakes by means of applying force mentioned below:
Mechanical: In a mechanical press, an electric motor added energy to a flywheel. A clutch involves the flywheel to control a crank mechanism that moves the ram vertically. Two advantages of the machinal press are accuracy and speed.
Pneumatic: Two synchronized hydraulic cylinders on the c-frame moving the upper beam operates the hydraulic presses. Servo-electric brakes use a servomotor to drive a ball screw to utilize tonnage on the ram. It utilizes air pressure to develop tonnage on the ram.
Hydraulic: Hydraulic machines are one of the most popular of all because of the better hydraulics and computer controls system. Hydraulic brakes deliver high-quality products, are trustworthy, use little energy, and are safer to use because of the motion of the ram can be effortlessly stopped at any time in reaction to a safety device, e.g. a light curtain.
Servo electric: This type of brake system is rendered of correct braking pressure control that works cooperatively with regenerative brakes together with a structure in which pedal force is not affected by braking pressure control.
While choosing a press branch for a CNC machine one should investigate the following points:
Before choosing a press brake for a CNC machine one must first know the type of material you want to bend like metal (stainless steel, mild steel, etc). After type one must need to determine the characterizes to be considered while calculating the part bend which includes thickness and length of the metal, the width of the V, inner radius, tensile strength, etc. Once the characteristics have been decided, then calculate the tonnage needed for the bending. The tonnage is the pressing force of the CNC press brake which decides the total pressure that can be applied by the punch during the bending operation for example high tonnage permits thick and hard metals to be bent and low tonnage is best for thin metals.
Configuration for press brake?
There are some configurations for press brakes, like:
The tandem press brakes – which is a combination of two press brakes that operate in synchronization with machinal alignment. These brakes are suitable for bending long and thick parts.
The robotic press brake – Many press brakes are now paired with robots to form an automated bending system. With the help of a robotic system, the machine can choose the right bend as per the part to be produced and its volume, without the need of an operator.
Which bending type should you choose?
There are 2 types of bending:
Bottom bending: In bottom bending, the punch curves the metal sheet with a high force (almost 3-5 times greater than air bending) which prevents the spring back effect which is generally associated with air bending. This method offers a high level of angular precision and is appropriate for sheet metal over 2 mm thick.
Air bending: In the air, bending is a spring back effect of the workpiece. As the bending force is weaker, the metal sheet springs backward like an elastic when the punch is removed so, one must adjust the bending angle as per the metal spring back and calculate the margin. It is most suitable for machines with reduced capacities, unlike bottom bending, which requires more force.
The other criteria that are important to consider while choosing a press brake are:
The angle control: Used to recompense for any inaccuracies in the press brake.
The back gauge: Adjustable gauge that stops the part by centering the bending line on the V-shaped opening of the die and allows the part to be bent in the right position.
Tools: Using hydraulic fastening allows for shorter tool change times like the clamping length also has some effect on the tool accuracy.
Operator safety: When changing tools, the best way is to stop the press brake motor and operate should never put hands on the work surface and should not work at the back of the machine.
In case you want to make use of CNC press brakes for some purpose for your industry ACCU GROUP can help you here. We provide outsourcing for such things. Just provide us well-defined information about the final product that you want, and you will get the one from our company. ACCU GROUP is one of the best outsourcing companies in Australia.