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Press brake

Forming process where the sheet is deformed by pressing between two tools.

Illustration of Press brake

The process

The workpiece is placed on top of the lower tool, the die [1]. The upper tool, the punch [2], is lowered and deforms the workpiece through a applied press force which leads to plastic deformation.

A variety of press brake tools are available to provide many different types of forming.

Since press force and pressing distance often an important parameter that affects the final result, today's edge presses are usually CNC controlled and follow preprogrammed bending sequences while the operator, if not robotic, is continuously instructed how the workpiece should be placed before the next bending.

Often, the machines are also equipped with a CNC backrest that helps to position the depth of the workpiece before each bending.

Machines intended for larger / heavier plates can have a roll table where the sheet is laid and then fed between the tool and die.

Advantages and disadvantages
In comparison with alternative methods
Large selection of bending tool with many different possibilities
Stable process