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Steel Plate Roll Machine Manufacturer

PRT 3-Roll Plate Rolling Machine

The upper roll of the PRT 3 Roll Bending Machine can move vertically and horizontally. Vertical movement of the upper roll is employed to change the curvature of the bent steel plate. In contrast, the horizontal movement of the upper roll is used to alter its symmetrical position concerning the vertical plane passing through the axis of the two lower rolls. This enables the bending of the steel plate at its ends and fulfills various process requirements.
PRT 3 Roll Bending Machine is the best solution for bending plates with thicknesses between 50 mm and 200 mm and widths from 1000 mm to 10000 mm.

Top Roll Horizontal Movement 3 Roll Bending Machine PRT

  • Bending Thickness: 50-200mm
  • Pre-bending Thickness: 40-160mm
  • Bending Width: 1000-10000mm

The NC PRT 3-Roll Bending Machine can complete the pre-bending and roll of both ends of the metal plate in one roll bending process after feeding the workpiece, without the need to unload the workpiece, and in the work of making cylindrical and arc-shaped workpieces, it can also perform certain shaping and leveling on the metal sheet, which has the effect of direct pre-bending, saving trouble and material, and is equipped with NC system control to improve the degree of automation.

  • PRT Top Roll Horizontal Movement 3-Roll Plate Bending Machine adopts Top Roll Horizontal Movement (mechanical transmission), and Vertical Movement (hydraulic transmission), driven by the lower rolls, electric centralized control operation system.
  • The upper roll can be used as a traditional bending machine, which can achieve the cylinder alignment, in the same way, the thick plate cone can be made through several times rolling.
  • The two small lower rolls’ center distance is conducive to the pre-bending of a thin plate with a small diameter, which can meet the pre-bending of various diameters.
  • The workpiece unloading is easier after completion.

The PRT 3 Roll Plate Rolling Machine is the best solution for bending plates with thicknesses between 50 mm and 200 mm and widths from 1000 mm to 10000 mm.

PRT 3-Roll Bending Machine
PRT 3-Roll Bending Machine


  • NC Control
    The amount of Top Roll Ram Down is automatically calculated by inputting application data, which reduces workers’ operation.
  • High Rigid Mechanical Structure
    The frame is rigidly designed based on pressure capacity and width of application materials. Top roll ram-down mechanism and rigid & compact lower frame simplify foundation construction.
  • High-Precision End Pre-Bending
    Freely set the length of the straight edge, and the top roller directly applies pressure for high-precision end pre-bending.
  • Precise Circularity and Cylindricity
    Top Roll Crowning and adjustment of Back-Up Roll help correct the deflection of both Top Roll and Back-Up Rolls to be more precise circularity and cylindricality of applications, which reduces the time of post-procedure. It can roll ideal products across a wide range from thin to thick plates.
  • Versatile Bending Shapes
    Equipped with devices for rolling O-shaped, U-shaped, multi-section R-shaped, and auxiliary conical shapes, it can roll a certain range of conical cylinders. O-shaped bending: bending at the rear; U-shaped bending: bending at the front; multi-section R-bending: combination method.
plate rolling machine
PRT 3 Roll Bending Machine

Structural Features

The PRT 3-Roll Bending Machine possesses dual functions of pre-bending and rolling, and its structure mainly consists of an integral base, tilting unloading side frame, fixed side frame, working rolls, support roll device, main drive device, top roll movement device, tilting device, hydraulic pump station, and electrical control system.

  • The structure of the PRT 3 roll plate rolling machine is compact and reliable, easy to maintain. The vertical and horizontal movement of the top roll is equipped with a digital display device, making it convenient to operate with precise control.
  • The tilting and resetting of the top roll are executed by hydraulic cylinders, and the balance of the top roll is achieved through the unloading device, making unloading more convenient.
  • The two lower rolls are the driven rolls, fixed in position. After being decelerated by the main reducer, driven by the main motor, the output shaft gears transmit motion to the gears located at the ends of the lower roll, causing it to rotate. The input shaft of the reducer has a brake device. When the plate is clamped between the upper and lower rolls, frictional force is generated, allowing the plate to move. The three points of contact between the three rolls and the metal plate form a radius, bending the flat plate. By adjusting the downward pressure of the top roll, the desired curvature or radius of the workpiece can be achieved.
  • The top roll is the driven roll, rotating due to friction between the working roll surface and the steel plate. Its vertical movement is driven by hydraulic cylinders at both ends of the top.
  • The horizontal movement of the top roll is driven by a braking motor through a pair of V-belt pulleys, transmitted to the input shaft of the secondary reducer, and then transmitted to the bearing seat via the output shafts of the reducer through a coupling. The worm gear pair in the worm wheel rotates through the rotation of the nut, causing the screw and the connected horizontal moving shaft to move forward or backward horizontally, thereby driving both the fixed and tilting side frames, along with the top roll, to move horizontally forward or backward.
  • At one end of the tilting unloading side frame of the PRT plate rolls, there is a tilting unloading oil cylinder. When the rolling work is completed, the top roll moves to the middle position and rises to a predetermined height. The tilting unloading oil cylinder acts to tilt the unloading side frame, removing the workpiece. After unloading, the tilting unloading oil cylinder acts again to restore the tilting unloading side frame, completing one work cycle.
steel plate rolling machine
steel plate rolling machine

Top 7 Benefits

  • Double-speed working system.
  • The workpiece unloading is easier after the completion plate rolling process of the PRT 3-roll plate rolling machine.
  • The upper roller can be used as a traditional bending machine, which can achieve the cylinder alignment, in the same way, the thick plate cone can be made through several times rolling. Conical bending device.
  • A small lower roller center distance is conducive to the pre-bending of a thin plate with a small diameter, which can meet the pre-bending of various diameters.
  • During the pre-bending and rolling, the plates always keep in a horizontal position so that the material can be moved more easily.
    Solid and special geometry structure makes it more suitable for use.
  • A large working stroke is good to get a better plating rolling effect and can roll thicker plates than similar 3-roller or 4-roller plate rolling machines. Induction hardening forged rollers or SAE1050 rolling steel rollers.
  • The horizontal movement of two lower rollers and a lower working height requires a smaller foundation pit and a smaller foundation bolt load (the minimum machine doesn’t need a foundation).
Top roll horizontal movement 3-roll bending machine

Working Principle

PRT 3 roll bending machine is a special cold bending equipment that uses the principle of three points to form a circle. Under normal temperature, the metal plate is rolled from a flat plate into an arc-shaped, cylindrical and conical workpiece.
  1. The top roll rises and falls vertically. Power: hydraulic cylinder. Function: Apply pressure to the plate to bend the plate.
  2. The top roll moves horizontally. Power: Electric motor. Function: Adjust the horizontal distance between the upper and lower work rolls, so that the upper and lower work rolls are arranged asymmetrically, so as to realize the pre-bending of the end of the sheet and reduce the length of the straight edge. ​​
  3. The lower rolls rotate. Power: Electric motor. Function: Provide torque for rolled sheet.
  4. Overturning the bearing body is overturned and reset. Power: hydraulic cylinder. Function: Unload the rolled work.

Technical Parameter

ModelPressure of Top Roller
Max. Bending Thickness
Pre-bending Thickness
Max. Bending Width
Top Roller Diameter
Bottom Roller Diameter
Central Distance
Main Motor(Kw)Hydraulic Motor (kW)Traveling Motor(Kw)
3-roll plate bending machine
steel plate rolling machine
steel plate rolling machine
steel plate rolling machine

Read More: Best Guide to Plate Rolling Process: Formula, 2 Tips, 11 Keys