A large press brake is not the only way to bend a large-sized part. Press brakes can be coupled to work in tandem, which might help increase productivity and throughput.
How do tandem press brakes work?
Like most single brakes, tandem brakes also are CNC. Ram depth accuracy and repeatability are achieved with scales and linear encoders. These components evaluate the position of the ram multiple times per millisecond and direct that information back to the CNC, which then governs the hydraulic system powering the machines. Instead of reading two scale positions for a single machine, tandem brakes read the position of four scales and adjust accordingly.
The machines can be controlled either from a single station to act as one long press brake, or they can be operated independently as two separate press brakes. Most CNCs even have an option that allows part programming to be shared across both machines.
When the brakes are operated as a tandem set, it is critical that both machines are set up and calibrated properly. While important for single-machine setup, calibration is even more crucial for tandem brakes. This starts with the mechanical features of the machines: the bed, ram, and tooling. If these items are not properly aligned, quality bends will not be achieved. Multiple methods are available to ensure precision alignment.
Once the mechanical features are in sync, it is imperative that both machines be functioning properly. Any problem one of the machines experiences will affect the operation of both. For instance, if a scale is misrepresenting the position of the Y1 cylinder on one side of the tandem, the tandem press brake will not be able to deliver consistency in the final bend angle across the length of the entire part. Additionally, if auxiliary components, such as backgauges and crowning devices, are employed on both machines, these will have to be working in precise conjunction with one another to ensure proper part quality.
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