Concept and advantages of CNC Press Brake
A Press Brake is a machine tool commonly found in industry for bending sheet metal workpieces into pre-programmed shapes that are tightly coupled between top and bottom (punch and die) tool sets.
Traditionally, hydraulic drive systems have been used to generate the required closing force, but in recent years more and more manufacturers of press brakes have begun to develop electric alternatives.
With the use and handling of hydraulic fluids no longer required, electric press brakes are rapidly becoming manufacturing shops that need to increase productivity, improve bending accuracy and safety, save on energy bills and improve their environmental credentials. Low noise and minimal maintenance are other advantages. The advantage of the motor is that the motor is only used when flexing, and is turned off when it is on standby.
Essentially, the ball screw acts as a piston and is controlled by an electric motor for high-precision performance. In addition to hydraulic presses, this system can also be used to replace the connecting rod/crank system in press brakes with mechanical drives.
There are two servo electric press brakes to choose from – Coastone’s direct ball screw drive C-Series or Safan Darley’s E-Brake system based on the pulley principle. All-electric models are available in machine configurations with pressures from 18 to 300 tons and working lengths from 0.5 to 4.1 meters.
For example, the Coaststone Press Brake is technologically advanced because it uses a servo motor and ball screw mechanism. Therefore, linear encoders are not used. There is direct motion from the servo motor to the ball screw. This results in fast cycle speeds although the pulley-driven electric press brakes take advantage of the multiplier effect to operate with bending forces of 330 tons or more. AC servo motors drive a dual pulley system that runs the length of the press brake’s ram. Their use of linear encoders results in low cycle speeds. For a wider range of production requirements, electric press brake technology has become more practical and cost-effective.
• These Press Brakes are very precise, and coupled with the absence of hydraulic oil, they produce high quality and precise parts that will last for years in production.
• Compared to conventional hydraulic press brakes, this reduces cycle times and reduces the risk of contaminating oil.
• Cycle times are said to be 2 to 2.5 times faster than their hydraulic counterparts without any negative impact on operator safety.
• Our Press Brake is equipped with a safety system, the Coaststone C series can be equipped with a simple light curtain to a laser safety system for maximum operational safety.
• They are also 50% more energy efficient than comparable hydraulic Press Brakes. Electric press brakes consume energy only when the upper beam is moving.
fast, precise and safe
Press Brake remains a common bottleneck in metal fabrication. It takes much longer to form parts than to cut them, and qualified, experienced press brake operators are becoming a rarity. The “art” of operating a traditional Press Brake—from shimming tools, programming bend sequences, to performing test bends—can take hours, even for experienced personnel. Off-line programming and real-time adjustment of brakes now allows for minutes instead of hours of setup
The electric Press Brake represents the latest development in bending machines. In fact, many machines simply cannot function unless proper protections are in place and fully functional. This technology makes the bending process not only faster and more accurate, but also safer.