Trajectories of the blades in an automatic panel bender (part II)

Sheet Metal Processing News 28. Dec, 2012 | by

Further to last week post, this week we explain the two remaining types of bending interpolations that performs the DANOBAT automatic panel bender. The panel benders complete the range of machines for sheet metal forming that offers the Sheet Metal division of DANOBAT, such as punching machines, punch-shear and punch-laser combination machines and the fiber laser cutting machines.

Trajectories of the blades in an automatic panel bender: Rolling

Trajectories of the blades in an automatic panel bender: Rolling

 

The second type of interpolation is called “ROLLING”. In this interpolation, attack distance increases progressively, to achieve that the blade and the blank do not slide between themselves, but they roll one over another.

The green line is the rolling area of the blank over the blade while the blue line shows the blade rolling over the blank.

The advantages offered by this type of interpolation are that it does not make marks in the plate contact area and a lower bending blade wear. The disadvantages, however, are that the bending radious is greater, as well as a bigger minimum tab length.

 

Trajectories of the blades in an automatic panel bender: Constant Attack Point

Trajectories of the blades in an automatic panel bender: Constant Attack Point

Finally we have the interpolation called ‘constant contact point’. In this case, the attack distance also increases progressively so that the point in which the blade makes contact with the blank is always the same.
The green line is the sliding area of the blank over the blade, while the blue point show the contact of the blade with blank. This interpolation type is halfway between the two other ones, both advantages and disadvantages, since the mark on the part is very small and the minimum is bigger than in the case of  constant attack distance interpolation and less than in the case of the rolling interpolation.

The operator can select the right interpolation type for each part, according to the tab size, angle and visibility of the bend in the final part.

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