How does the press brake bending machine compensate for the disturbance

How does the press brake bending machine compensate for the disturbance

In order to eliminate the adverse effects caused by the deformation of the slider, it is necessary to compensate the deflection deformation of the slider. The usual compensation methods are as follows:

Through compensation, the deformation of the slide block of the machine tool is offset, thereby ensuring the precision of the machining joint surface and improving the precision of the workpiece.

1. Hydraulic cylinder compensation method:

Electro-hydraulic servo bending machine + hydraulic deflection compensation↓

The hydraulic automatic deflection compensation mechanism of the worktable is composed of a group of oil cylinders installed in the lower worktable. The position and size of each compensation oil cylinder are designed according to the deflection compensation curve of the finite element analysis of the slider and the worktable. Hydraulic compensation The bulge compensation of the neutral version is realized by the relative displacement between the front, middle and rear vertical plates. The principle is to realize the bulge through the elastic deformation of the steel plate itself, so the compensation amount can be realized within the elastic range of the workbench. adjust.

Second, the mechanical compensation table method:

Double electric servo hybrid bending machine + mechanical deflection compensation↓

The convex wedge block is composed of a group of convex wedge blocks with a slope. Each convex wedge block is designed according to the deflection curve of the slider and the finite element analysis of the worktable. The numerical control system calculates the required compensation amount according to the load force when the workpiece is bent (this force will cause deflection and deformation of the slider and the vertical plate of the worktable), and automatically controls the relative movement of the convex wedge block, so as to effectively Compensate the deflection deformation produced by the sliding block and the vertical plate of the worktable, and can obtain the ideal mechanical deflection compensation of the bending workpiece. The "pre-bulge" is realized by controlling the position. The curve that matches the actual deflection makes the gap between the upper and lower molds consistent during bending, and ensures that the angle of the bending workpiece in the length direction is consistent.

3. Advantages of mechanical compensation:

1. Mechanical compensation can obtain precise deflection compensation over the full length of the table. The mechanical deflection compensation has long-lasting stability, reduces the maintenance frequency of hydraulic compensation (such as oil leakage), and is maintenance-free during the life of the machine tool.

2. Mechanical deflection compensation Because there are more compensation points, the bending machine can bend the workpiece more in a linear compensation way and improve the bending effect of the workpiece.

3. Mechanical compensation is to use a potentiometer to measure the position of the return signal, as a numerical control axis, to realize digital control and make the compensation value more accurate.