CNC Press Brake structure

The machine is mainly composed of the following parts: bed parts, slider parts, Y-axis detection parts, mold clamping parts, back gauge parts, compensation parts, hydraulic system, console relays and other main parts, as shown in (Figure 1) Show. It is described as follows:

Figure 1  Press brake structure diagram

The machine frame adopts the whole steel plate welding form, adopts tempering heat treatment to eliminate stress, and the surface is sandblasted and sprayed with anti-rust paint. The material of the frame is Q235-A, which has excellent rigidity, excellent anti-twisting and anti-tilting ability. The high-rigidity design makes the sliding block and table less deformed during bending, and the workpiece has excellent straightness and angular consistency to ensure accuracy. The frame is processed at one time to ensure the parallelism and verticality of each installation surface. Please refer to Figure 2 for the specific structure.

Figure 2  Frame

The stopper parts of the machine are controlled by AC servo motors, with closed-loop control and retraction control functions, and can realize movements in multiple directions, that is, the front and back (X-axis) of the beam, and the lifting (R-axis) movement of the beam.The front and back and up-and-down movements of the beam are realized by using precision ball screws and linear guide rails to turn rotary motion into linear motion. As shown in Figure 3 is the standard configuration of the back-gauge structure of this series of models.

Figure 3  X axis and R axis back gauge

This machine adopts a digital control system to control the stroke of the slider in a closed loop. Position sensors are installed on both sides of the side plate of the machine. The sensors on the slider are connected to the bed, and the movement of the slider is detected by the closed-loop sensor and then fed back to the CNC system. The structure of a common position sensor is shown in Figure 4.

Figure 4  Position Sensor

The worktable is equipped with a deflection compensation mechanism, which more effectively compensates for the deflection deformation of the lower die. The compensation amount is controlled by the numerical control system, which ensures the consistency of the bending angle of the whole length and makes the straightness of the workpiece to be higher. The mechanism consists of multiple pairs of upper and lower wedge blocks, and the relative position of each pair of wedge blocks is adjusted to make corresponding deflection compensation. The mechanism is shown in Figure 5 below.

Figure 5 Compensation system