Which one is better for CNC press brake compensation

Difference for press brake’s hydraulic compensation and mechanical compensation

During the bending process of the workpiece, due to the most stressed at both ends of the slider, the reaction force when the plate bending causes the surface of the surface to produce concave shape variables, and the metaphysical variables in the middle of the slider are the largest. In order to eliminate the adverse effects of slider deformation, it is necessary to compensate the deflection deformation of the slider. Hydraulic compensation and mechanical compensation are to cause upward flexible deformation in the middle of the workpan to offset the deformation of the slider of the machine and ensure that the processing of the processing of the processing is combined with the surface of the processing surface. Prepare the accuracy of workpieces, and focus on analyzing hydraulic compensation and mechanical compensation.

What is Hydraulic compensation?

It belongs to the local compensation function. Relying on the compensation oil cylinder of the bending machine down the workbench for local perspective compensation, it cannot achieve the effect of overall compensation like mechanical compensation.

CNC press brake 1

CNC press brake 2

Mechanical compensation: It is currently the core technology of press brake and the most advanced bending machine compensation technology at present. It is an overall compensation method. It solves the unpredictable of the material differences in the bending process due to the difference in materials, the deformed deformation of the equipment, etc. The factors affect the angle of bending workpieces to cause a certain error to make overall compensation.

CNC press brake 3

CNC press brake 4

CNC press brake 5

In the case of using a hydraulic compensation agency, the CNC system outputs the corresponding analog voltage of the compensation voltage to the compensation amplifier card according to the thickness, length, length, and the selected mold. The opening size of the valve, when the slider enters the slow down state, until the whole process of the slider starts to the upper dying point, the compensation proportional valve has been power -on. If the pressure of the dead point under the machine tool at this time, the actual deformation of the workbench under the machine tool under the condition that the pressure is shorter and the pressure -keeping time is slightly longer, the processing accuracy of the bending workpiece may generate Some errors. If there are debris in the hydraulic oil, it will cause the hydraulic ratio valve core to die, and the processing accuracy error will be greater. Because the compensation pressure is divided from the pressure of the entire system, when the compensation valve is working, the entire system pressure will be partially lost, because the hydraulic oil is controlled. Leakage can cause pollution.

The mechanical compensation technology is a convex wedge block, which consists of a set of sloping sloping wedge blocks. Each convex wedge is designed based on the deflection curve of the slider and the finite element analysis of the workbench. CNC systems are based on the load capacity of the load when bending in the workpiece (this force will cause deflection to defle the slider and the workpanage plate), calculate the compensation amount required, and automatically control the relative movement of the convex wedge block, thereby effectively effectively to effectively effectively.

Compensation slider and the deformation of the deflection generated by the standing plate of the workpan can get the ideal bending workpiece mechanical deflection compensation to achieve “pre -conversion” in a control position. The actual deflection curve enables the gap between the upper and lower molds when bending, and ensure that the bending workpiece is consistent in the angle of the length direction. Mechanical compensation can obtain accurate deflection compensation on the full length of the workbench. Mechanical deflection compensation uses lasting stability, reduce the maintenance frequency of hydraulic compensation (such as oil leakage), and avoid maintenance during the life of the machine tool.

Due to the more compensation points, the mechanical deflection compensation makes the bending machine bending the workpiece at work can achieve a linear compensation method and improve the bending effect of the workpiece. Mechanical compensation is driven by an electric motor. As a CNC axis, digital control is achieved, making the compensation value more accurate. The advantages of good flexibility, low cost, and continuous compensation that can achieve deflection of mechanical compensation methods, which is more conducive to corporate cost control.

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