Cutting with guillotine shears

What actually takes place when a sheet is cut with the guillotine shears? Why are the cut angle and the kerf so important?
Link motion and oscillating cutting systems
Link motion and oscillating cutting systems

 

What happens during cutting depends first of all on the cutting technique used: link motion or oscillating cutting systems. In link motion systems, the tool blades move parallel to each other. In oscillating cutting systems, the upper blade moves toward the workpiece with a rotatory movement. Oscillating cut systems have the advantage of particularly high rigidity and are therefore used for exceptional conditions.

The larger the shear zone, the cleaner the cut edge.

In principle, guillotine shears function like ordinary scissors. The sheet is positioned between two blades that move past each other in parallel and thus cut the sheet. First the knives cut the sheet until it finally breaks. Consequently, the blade is separated into two zones, the shear zone and the break zone.
Kerf and cut angle
Kerf and cut angle

 

The larger the shear zone, the cleaner the cut edge. But how is the largest possible shear zone achieved? The secret lies in the choice of the right cut angle and the right kerf. Both have to be adapted to the material to be cut and its thickness in such a way that the material breaks as late as possible. In the process it must be kept in mind that the kerf near the shear zone also influences the width and depth of the infeed as well as the cutting power and burr formation. The cutting angle depends first of all on the hardness and thickness of the sheet as well as the power of the shears.

Guillotine shears