Plate rolling mill is a commonly used forging equipment that can form metal plates into conical, spherical or tubular shapes, among other shapes.
The machine is called “four roller” because of its four rollers.
What is the structure of four roll plate rolling machine?
What precautions should be taken when using the machine?
Let's explore these topics further.
The structure of four roller plate bending machine
The upper roller of a four-roll plate bender roller is a drive roller, while the lower roller and side roller are slave-driven rollers.
The position of the upper roller is fixed, while the lower and side rollers can be lifted and moved.
The upper roller is driven by a hydraulic motor, while the rotation of the lower and side rollers is driven by friction between the steel plate and the rollers.
Both the bottom roller and the side roller are lifted through the oil cylinders at both ends.
The reversal of the upper roller front bearing body is carried out by a reverse oil cylinder. Both bearing bodies and oil cylinders are mounted on the left and right ends of the frame.
The left and right frames are the main body of the four-roller machine, and the entire base is installed with a welding frame.
As for the pushing device, after the workpiece is rolled, the overturned oil cylinder pushes it outward when it is placed in place.
The entire operation of the machine is carried out on the operating table.
The rollers of the four-roll rolling mill can clamp the steel plate to prevent slippage during bending.
The side roller can position the steel plate, allowing it to be calibrated during feeding. This makes it easier to bend conical, elliptical and other shapes.
The steel plate cannot be reversed during pre-bending and circular rolling in the four-roll bending machine.
Precautions for using a four-roll roller bending machine
If abnormal machine noise, shock, vibration, electrical leakage or high temperature (>60°C) is detected in the hydraulic oil, motor or bearings, the machine must be stopped immediately for inspection.
When checking roundness with a sample, this should be done after stopping the rolling mill.
It is strictly prohibited to extend your head while rolling the steel plate.
Machine operators should stand to the sides of the rolled steel plate and should not stand in front of or behind the plate bending rollers (effective working surface of the upper roller). No one should stand on the sheet during the rolling process to prevent the steel sheet from stretching or falling and causing harm to people.
The specifications of the rolled sheet must not exceed the limits specified in the equipment specifications and capacity table.
Roller pressure must not be adjusted without authorization.
The operator must constantly monitor operating conditions.
All laminated sheets must be wound in the center of the roll and no skidding is allowed during the laminating process.
During the rolling process, the operator must constantly observe the various operating conditions and the sheet must not slip off the roller. The workplace must not be invaded by outsiders.
When tilting the structure, the horizontal direction of the upper roller must be in the middle position, and it can be overturned when the vertical direction is at the highest point. The upper roller must not be moved horizontally when in contact with the lower roller.
When initial welding is performed on the rolling mill cylinder, the ground wire of the welding machine must be in good contact with the cylinder body.
