Swing cut shears

At the start of the cut, the upper knife hits the sheet metal almost above the lower knife.

The back gauge releases the sheet after the cut.

Swing cut shears are machine tools for making straight cuts in sheet metal. With a swing cut , the cutter bar moves in an arc with the upper cutter . At the start of the cut, the upper knife is almost vertically above the lower knife and moves away from the lower knife as the cut progresses. This results in a very straight cut , which is crucial for the dimensional accuracy of the blanks, especially with thicker sheets .

With the circular movement of the cutter bar, the back gauge releases the sheet metal so that it cannot jam between the lower cutter and the stop. This ensures the long-term accuracy of the machine. The knives have a longer service life , have to be changed or re-sharpened less often, and machine downtimes are reduced.

Cutting gap

With swing cuts, the cutting gap can be adjusted by turning an eccentric.

Sharp knives and a correctly set cutting gap are decisive for a clean cut .

With CNC -controlled machines, the control calculates the cutting gap from the input of the sheet thickness and hardness . If the operator starts a program, the shears automatically set the correct cutting gap.

Cutting angle

Fixed, small cutting angle between the upper and lower knife (e.g. 1 degree) guarantees torsion-free cuts

The flatter the cutting angle (angle between the upper knife and the lower knife - more precisely the cutting edges at the start of the cut), the more torsion-free the blanks, especially the sections. This has a decisive influence on the quality of the cut, especially when cutting narrow strips. A particularly rigid machine design and a powerful drive are required for a flat cutting angle.