Bending of metals and alloys are done with the help of mechanical machines called press brake machines. These machines have mechanisms to apply forging force in the form of hydraulic press, or electromagnetism that is used for shaping, bending or rolling the metal or alloy into sheets of definite size and dimensions. This process creates a controlled bend in the material at a certain angle. The type of press brake, whether hydraulic or mechanical (CNC or not), has no effect on the accuracy of the machine; rather, it has to do with the control of the pressure, speed and position of the punch.
As mentioned earlier, CNC machines also provide an advancement in bending operations where programmers can program in addition to control via CNC, the rotational sequence for the part, how the back gauge is set, and adjustments to the angle of the bend. This allows for Press brake manufacturers to quickly and efficiently create complex shapes while achieving a high level of precision, high surface quality and very tight tolerance.
Different components of Press brake machines
Machines known as press brakes are made of numerous important parts which work together in general to bend metal accurately and efficiently. The primary components of the press brake machine include: the frame, or base, of the press brake which supports the entire machine; the ram (or slide) which moves vertically; the punch and die which are used to form the metal into whatever angle or shape is needed during the bending process; back gauges which allow for accurate and repeatable positioning of the metal for the production of identical parts; the hydraulic or mechanical system which creates the necessary force to bend the metal, and the CNC control system which allows for programming and/or controlling of the bending cycles, angles and positions of the workpiece. Finally, the crowning system is an additional piece of equipment used with a press brake that provides for uniformity of bend along the entire length of the metal. This makes press brakes very reliable for any type of precision fabrication.
How are Press brake machines manufactured?
Most companies create press brake machines by way of a multi-stage production procedure that is designed to produce machines that are strong, manufactured accurately and designed for long lasting use. The first step of this building process is the creation of an extremely sturdy machine frame comprised of high grade steel plates which are cut, welded, and stress relieved to remove any internal stress. Once the frame has been created, the frame will then be machined on high quality CNC machine tools to provide tight tolerances and perfect machined alignment. Then the various major components of the machine such as the ram, bed and back gauge systems will be assembled into the frame along with their respective hydraulic or mechanical drive systems depending on the type of press brake machine built. After all major components are assembled into the machine frame, precision tooling such as the punches and dies will be installed into the machine frame. After precision tooling is installed into the machine, all electrical systems and CNC (computerized numerical control) controllers will be integrated into the machine in order to provide automatic operation of the machine. After all of that is accomplished, the machine will have to go through a series of tests, calibrations and quality checks in order to ensure that it is capable of producing consistent and safe bending products with a long service life in a manufacturing setting.
Quality control factors that Press brake machines manufacturers must know
To achieve accurate, long-lasting, and consistently performing press brake machines, it is important for manufacturers to have quality control procedures in place. The following elements are necessary to ensure quality control at the manufacturing facility: using high-quality raw materials that maintain the integrity of the overall structure of the machine; machining components accurately in order to maintain tight tolerances; aligning the ram, bed, and tooling with each other; avoiding any errors in bending the parts of the machine; performing calibration to maintain consistent pressure (and, therefore, consistent positioning) of hydraulic systems and associated CNC controllers. All manufacturing facilities should have quality checks at every stage of the production cycle (fabrication through assembly); however, special attention should be given to checking for functionally accurate bends and repeatability of the machine. Furthermore, documenting your inspections, complying with any applicable industry standards, and providing the required tools for performing all inspections that are required can minimize defects and result in reliable performance from the machinery to standard specifications.
Conclusion
The Manufacturer must gather a thorough understanding of how a press brake operates, its major components, its manufacturing process, and its controls in order to be able to manufacture parts made from metal with an extremely high level of precision and confidence.
Manufacturers that are able to control the force, position the material, and establish the correct bending sequence (particularly when higher levels of CNC technology used) can create a part or component with a high degree of complexity and a very high level of consistency and surface quality. Manufacturers that utilize the knowledge of all of these factors in conjunction with maintaining a rigidly built machine, properly designed components, and established quality control procedures will develop machines that operate at an optimal level with fewer mistakes and are efficient for a long period of time. Ultimately, the knowledge attained by using the methods described above will support the ongoing production of metal components by manufacturers who can provide products that meet the demands of their target industries while continuing to maintain high production levels and quality.