According to the three-point forming principle, the plate bending machine continuously elastically and plastically bends the plate by utilizing the relative position change and the rotary motion of the work roll, thereby obtaining a workpiece having a predetermined shape and accuracy.
The structure of the four-roll plate bending roll is shown. It is mainly composed of low frame, rollover device, upper roll, lower roll, double roll, lifting frame, base, balance device, transmission device, electrical system, hydraulic system and so on.
Structure of four-roll plate bending machine
The work roll of the four-roll plate bending roll consists of four rolls: upper roll, lower roll and double roll.
The upper roller is the main drive roller and is embedded in the upper and lower frames through the bearing body. Its position is fixed and can only be rotated.
The lower roller is fixed on the bearing seat. To compensate for the thickness of the bent plate, the bearing housing can move linearly within the sliding path of the frame.
The rollers on both sides are mounted on the bearing housing. In order to obtain a specific radius of curvature of the cylinder, the side roller bearing housing can be moved up and down at an angle relative to the vertical direction.
- 1.Left frame
- 2. Rotary device
- 3. Roll up
- 4. Scroll down
- 5. Beside the drum
- 6. Balance device
- 7. Connecting beam
- 8. The correct framework
In general, rolling a metal plate into a cylindrical workpiece on a four roller plate bending machine consists of four processes, namely:Center-aligned, Pre-bending, scroll, Roundness correction
During the operation of the calender, the front end of the pressure roller plate is first placed between the upper and lower rollers, and the center (on one side of the high pressure roller, the platen end is aligned with the side pressing roller) is aligned, and then the lower roller pressing plate is raised. Lift the other side of the pressure roller to apply a force to bend the end of the metal plate.
When pre-bending the other end of the plate, the metal plate does not need to be removed from the mill. Move the circuit board to the other end of the machine and pre-bend in the same way.
Then continue to scroll using one feed or multiple feeds until the desired cylindrical radius of curvature is reached
Finally, roundness correction is performed to obtain the desired roundness and cylindricity.
It can thus be seen that when using four rollers to bend the circuit board, the circuit board must be placed once in the rolling mill in order to realize all the bending rollers.Load Analysis and Driven Power Calculation of Four Roll Plate Bending Machine