When you have still got to do a bend in a complex part, but it would take the Carriage into the Pressure Die area instead of extending the material so that the Carriage is outside the Pressure Die zone before the Pressure Die closes, use this feature.
A good control system will automatically know that the Carriage is going into this zone and open the Pressure Die fully, move the tube forward, grab hold of the tube using the Clamp, release the Collet and move out of the Pressure Die zone before the Pressure Die closes and the bend is completed.
Obviously to achieve the most optimum cycle time it may be prudent to optimise the Pressure Die length to eliminate this sequence, a good control system will tell you what the optimum length of the pressure die is for a particular part.
To do this you need to do what is called Tube Recapture.
Again a good control system will know that it has already released the tube during a Pressure Die Interference Move, be able to work out the amount of material consumed during the bend, return the bend arm the correct spring-back and slowly move forward to re-grab the tube.
It can then repeat the Pressure Die Interference Move above.
Sometimes you may even need to go into the Wiper Die zone, and to do this you need a Swing Away Wiper Die, the more advance machines often combined this feature with Servo Rake Adjustment for even greater Automatic Setup.
To be able to do this on difficult tight radius, large diameter, thin wall material applications, you will also need a Dynamic Tie Bar to automatically release the Tie Bar support, swing the wiper out of the way, allow the carriage to come forward, grab hold of the tube using the Clamp, release the Collet and move out of the Pressure Die & Wiper zone before the Wiper Die resets its Rake and the Dynamic Tie Bar engages and Pressure Die closes and the bend is completed.
