Discover how KRRASS’s Bending technology can help you optimize your production

No matter if you’re producing pressure vessels, heat tanks, cylinders for airplanes or rolling plates for heaters – we got you covered. We develop tailored plate rolls, either multi-purpose or specific-purpose. Below you’ll find plate rolls with Swedish Quality and German steel to ensure Worldwide market dominance


KRRASS Plate Bending Machine

KRRASS® The Strongest, most Sophisticated and most Reliable Bending machines on the market, worldwide. Combined with the most developed Intelligent Algorithm Bending System (Born 2013) powered by our nearly limitless SEVEN CNC system. We’ve prepared for the Fourth Industrial Evolution, have you?

KRRASS Economic Asymmetry Plate Roller Machine

W11F Asymmetry 3-Roller Plate Rolling Machine

KRRASS® economical plate bending machine, it is an economical Plate Bending Machine, it has a pre-bending function, for the maximum 6mm minimum 2mm, the length is between 1000-2000mm, it is one of the best choices for thinning plates .

KRRASS Plate Rolling Machine

KRRASS Economical Mechanical three-roll plate rolling machine

W11 3-Roller Plate Rolling Machine

KRRASS® economical mechanical three-roll plate rolling machine, mainly for the rounding of 4mm to 40mm, 1500mm to 4000mm length plates, is a very affordable and economical plate rolling machine, the best choice for customers with small processing volumes.

KRRASS CNC type Four Rolling machine

KRRASS® CNC Four-Roller plate rolling machine, which is controlled by CNC system to form a circle at one time, with a pre-bending and rolling cone device, you can choose the coil support, and the coil support is left and right. Powerful functions, suitable for mass production, improve work efficiency and save labor, it is the best choice for large coils.

KRRASS Economic Profile Bending Machine

Professional profile bending machine

The WYQ24 angle roll series feature guide rolls that follow the main bending rolls. The guide rolls are mechanically adjusted to support the material as it enters the machine and to facilitate the rolling of asymmetric sections like angle iron. Operate your machine with our Bluetooth Bending Control – customized for you. The future is here, the WYQ24 will ensure your key player position as a multifaceted bending specialist.

Three-roll plate bending machine VS four-roll plate bending machine

What is Plate Rolling Machine?

Plate Rolling Machine is a kind of equipment that uses work rolls to bend the sheet metal. It can form parts of different shapes such as cylindrical parts and tapered parts. It is a very important processing equipment. The working principle of the plate bending machine is to move the work roll through the action of hydraulic pressure, mechanical force and other external forces, so as to make the plate bend or bend into shape. According to the rotation movement and position changes of work rolls of different shapes, parts such as oval, arc, and cylindrical parts can be processed.

working principle:

  1. In the W11 series Symmetrical plate rolling machine, the upper roller of the W11 series Symmetrical plate rolling machine uses the hydraulic oil in the hydraulic cylinder to act on the piston to move vertically at the central symmetrical position of the two lower rollers. Provide torque for rolled sheets. The flat plastic metal plate of the bending machine passes between the three working rolls (two lower rolls and one upper roll) of the bending machine. With the help of the lower pressure of the upper roll and the rotation of the lower roll, the metal plate is passed through multiple passes. Continuous bending (the inner layer is compressed and deformed, the middle layer is unchanged, and the outer layer is stretched and deformed) to produce permanent plastic deformation and roll into the required cylinder, cone or part of them. The disadvantage of this hydraulic three-roller bending machine is that the end of the plate needs to be pre-bent with the help of other equipment. This rolling machine is suitable for large rolling machines with a thickness of more than 50mm. A row of fixed idlers is added under the two lower rollers to shorten the span of the two lower rollers, thereby improving the precision of the rolled workpiece and the overall performance of the machine.
  2. The position of the upper roller of W12 Series Plate Bending Machine is fixed, and the lower roller moves upward linearly to clamp the steel plate. The rollers on both sides move in a straight line or arc to move closer to the roller to adjust the radius of curvature of the reel. The four-roller and three-roller rolling machines have different roller motion forms, but the working principle is the same, they both use the principle of three-point fixed circle to carry out different radii rolling. However, the pre-bending straight edge and roundness of the four-roller bending machine are better than those of the three-roller.

Types of rolling machines:

The type of plate bending machine varies depending on the field of use. From the number of rolls, it is divided into three-roller and four-roller. The three-roller is divided into symmetrical three-roller bending machine, asymmetrical three-roller bending machine, horizontal downward adjustment three-roller bending machine, W11S upper-roller universal bending machine and four-roller CNC bending machine. From the transmission point of the mechanical type and hydraulic type. In terms of the development of the plate bending machine, the upper-roller universal type is the most backward, and the four-roller CNC bending machine is the most advanced. At present, the most commonly used in the market are W11F partial Samsung plate bending machine, W11S upper-roller universal plate bending machine, W11 mechanical symmetrical plate bending machine, W12 four-roller plate bending machine.

  1. The mechanical type is divided into W11F asymmetrical plate rolling machine and W11 series symmetrical plate rolling machine

Performance and characteristics of W11 series symmetrical plate rolling machine:

The structure of the machine is three-roller symmetrical type. The upper roller moves vertically at the symmetrical position of the two lower rollers. It is obtained by the transmission of the screw and screw nut. The two lower rollers rotate through the output gear of the reducer and the lower roller. The gears mesh to provide torque for the rolled sheet. The disadvantage of this machine is that the end of the plate needs to be pre-bent with other equipment.

Performance and characteristics of W11F asymmetrical plate rolling machine:


The structure of the machine is a three-roller asymmetrical type. The upper roller is the main drive, and the lower roller moves vertically to clamp the plate. The lower roller gear meshes with the upper roller gear and serves as the main drive at the same time; the side rollers are tilted and lifted. , With dual functions of pre-bending and rolling. Compact structure, convenient operation and maintenance.


  1. The hydraulic type is divided into W11S upper roll universal type and W12 four-roller plate bending machine:


The main features of W11S upper roll universal type: The upper roll universal bending machine adopts the upper roll lifting hydraulic drive and horizontal movement (mechanical transmission), driven by the lower roll, and the electric centralized

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