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Sheetmetal Australia provides fully electric press brake for higher productivity

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article image Safan’s fully electric press brake with patented belt drive from Sheetmetal

Sheetmetal Machinery Australia  provides Safan’s fully electric press brake with patented belt drive delivers higher productivity. Termed as E-Brake, the innovative instrument from Safan produces the pressing force by means of synchronised electric motors which transfers via Belts & Pulleys to the beam. This drive principle brings many advantages:

· no problems with hydraulic oil
· low energy consumption
· higher productivity

Since SAFAN introduced to the world the first mechatronic press brake its patented drive system has been optimised, the electronics refined and the range of applications expanded.

Productive bending depends less on the theoretical speed of the beam than on the times between the bends. An efficient Press brake machine must therefore optimise these functions and not just the beam speed.

When a product requires several bends it is common practice to operate the machine at its fastest beam speed. Between the bends, the component is turned and inserted as required for each fold. Most time is lost between the bends by handling, the change over time between Fast and Slow points of the beam and the back gauge positioning speed. With safety on the one hand and the well-known inertia of Hydraulic systems on the other hand being the major limiting factors.

The solution is the E-Brake mechatronic press brake from Safan.

The control of the electric motors used in the machine is the basis of this innovative system. The principle of the system is a pulley-block, which pulls the top beam of the press against the effect of laterally arranged return springs into the die, and applies the pressing force evenly along the length of the machine. In 98% of cases no crowning table is required.

When rolling the belt up, the driving motor pulls the beam downward into the die. The return springs strained during the bending procedure return the beam to its initial position.

The E-Brake is available from 25 to 200 Ton pressing force and lengths from 1250 to 4100 mm. Depending upon size and power requirements, the number of pairs of pulleys varies. In the largest machine four pulley-block arrangements with their own drives and nine pairs of rolls each are present. With this machine a 100 mm wide belt is used. The belts are made from the same 3mm thick wire-strengthened material coated with polyurethane that is also used extensively in elevator systems. T

The drive is provided by Lenze electric motors. The 4m machine with 200 ton pressing force requires a total output of 22 KW. The force is distributed evenly over 36 rolls attached to the upper beam. The framework of the E-Brake forms an “O” which is naturally more rigid than the usual C-frame of Hydraulic machines. The back gauge is also very distinctive because it extends across the full width of the machine.

Cycle times 30 per cent faster than conventional press brakes are offered by the E-Brake mechatronic press brake

Safan’s own electronic control system ensures very short response and delay times resulting in bending speeds of up to 20mm/sec. The high acceleration and other servo motor characteristics mean not only very fast approach speed but also a seamless change over to bending speed.

Working at high speed without risk is achieved through the active safety system built into the touch screen control.

The safety light curtain is programmable directly from the touch screen with innovative settings to maximise productivity whilst maintaining a safe operating environment. This programmable light curtain also has features that give you the opportunity to move the upper beam and back gauge into the next step without using the foot pedal. This means that the machine is already in its next position while handling the sheet.

The combination of these features delivers typical cycle times 30% faster than conventional press brakes.

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