The distance between the upper and lower molds is directly controlled by the grating ruler. The grating ruler (encoder) installed on the correction frame continuously detects the position of the slider with micron-level accuracy. The positioning accuracy of the slider and the required load deformation do not affect the bending accuracy.

The servo valve that controls the positioning of the slider is installed on the cylinder. The volume change of the hydraulic oil is very small, which can quickly and smoothly control the slider. The high-speed rotation of the variable frequency oil pump motor can increase the oil supply volume, enabling the slider to move at high speed.

In the bending process, it is inevitable that the middle opening phenomenon will occur due to bending load, pressure head, and deformation of the lower bed body. All models of the PBZ series are standardly equipped with a deflection compensation angle control device under the workbench, which can easily eliminate the smooth curve of deflection deformation by moving the handwheel.

The adoption of an electric Angle controller enables the automatic setting of deflection compensation for each process, and the preparation time can be further shortened. The numerical control deflection compensation device is a standard configuration for the NET model.