Why cnc press brake bending machine need the crowning compensations?

In the process of bending, when the CNC Press Brake exerts force on the sheet metal, the sheet metal will also produce a reaction force on the machine,which will make the machine deform, thus affecting the accuracy of the folded sheet metal.

In order to eliminate the adverse effects caused by the deformation of the slider, it is necessary to compensate for the deflection deformation of the slider. The usual compensation methods include hydraulic compensation and mechanical compensation, both of which make the middle of the worktable produce upward elastic deformation to offset The deformation of the machine tool slide ensures the accuracy of the machining joint surface and improves the accuracy of the workpiece.

When choosing CNC PRESSBRAKE, we should consider not only how many tons of bending machine (bending force of bending machine), knife edge width, throat depth and column spacing, but also the compensation mode of CNC bending machine.

Because the two kinds of bending compensation modes have different requirements for operators, different product precision, and it is very important for buyers to know what compensation mode to choose.

What is mechanical compensation? 

Mechanical compensation is the use of oblique wedge to compensate the table. The wedge can be divided into a single wedge and many groups of wedge. The mechanical compensation composed of multiple groups of inclined wedge blocks has more compensation points, more than the ordinary hydraulic compensation 3 compensation points, there is no compensation blind area, the folded workpiece precision is high, each processing plate difference is small, suitable for mass production.

Advantages: mechanical compensation system is more simple, will not cause oil leakage and other situations, low failure rate, environmental protection.

Disadvantages: Mechanical compensation is more demanding for operation, and workers need to make real-time adjustments if the workpiece needs to be bent in multiple steps. And after long-term use, the mechanical convex wedge will wear, affecting the compensation effect.