Case

SC W12 25X3200 Four-Roll Plate Rolling Machine For Sale

SC W12 25X3200 four-roll plate rolling machine is a high-rigidity hydraulic four-roll plate bending equipment designed for processing medium and heavy plates. It is mainly used to roll carbon steel, stainless steel, low alloy steel, and other metal plates into cylinders, arcs, cones, and other curved workpieces.

The core processing capabilities of this specification are typically: maximum plate thickness 25mm, maximum effective plate width 3200mm, and pre-bending thickness approximately 20mm. It is suitable for industries such as pressure vessels, storage tanks, boilers, steel structures, wind power, petrochemicals, construction machinery, pipelines, and large equipment manufacturing.

1. Basic Parameters of the W12 25X3200 Four-Roll Plate Rolling Machine

Below is a representative configuration parameter for the W12 25X3200 four-roll plate rolling machine:

Item	Reference Parameters
Equipment Model	W12-25×3200 Four-Roll Hydraulic Plate Rolling Machine
Structural Form	25mm
Maximum Coil Thickness	20mm
Maximum Pre-bending Thickness	3200mm
Maximum Coil Width	Approx. 3300mm
Effective Length of Work Roller	≤245MPa
Sheet Yield Strength	Approx. 430mm
Upper Roller Diameter	Approx. 390mm
Lower Roller Diameter	Approx. 330mm
Side Roller Diameter	Approx. 4.5m/min
Coil Speed	Approx. 22kW
Main Drive Power	Hydraulic Drive
Drive Type	NC/CNC Optional
Control Method	Double-End Pre-Bending
Pre-bending Method	Configurable
Conical Coiling	Optional
Large Diameter Workpiece Support	Carbon Steel, Stainless Steel, Low Alloy Steel, etc.
Material Type	W12-25X3200 Four-Roll Hydraulic Plate Rolling Machine

The parameters mentioned above represent a typical configuration and are not identical for all W12-25×3200 products. For example, other manufacturers’ models of the same specifications may use a 30kW main motor and 430/390/340mm roll diameters.

Therefore, 25X3200MM does not represent a globally unified standard, especially regarding minimum rolling diameter, roll diameter, motor power, hydraulic system pressure, and number of control shafts, which need to be confirmed in conjunction with the manufacturer’s technical specifications.

2. What is a W12 four-roll plate rolling machine?

The W12 is a typical 4-roll metal sheet rolling machine.

Compared to a three-roll plate rolling machine, it adds a lower roll for clamping and positioning, allowing the sheet metal to form a more stable clamping state between the upper and lower rolls. Simultaneously, the bending radius of the sheet metal is controlled by the left and right side rolls.

The four working rolls perform different functions:

1) Upper Roll

The upper roll is usually the most important working roll of the equipment and one of the main drive rolls.

Main functions:

Pressure the sheet metal
Provide rolling pressure
Work with the lower roller to form a clamping mechanism
Drive the sheet metal longitudinally
Participate in the final arc forming

For 25mm medium-thick plates, the rigidity and surface quality of the upper roller are crucial.

2) Lower Roller

The lower roller is mainly responsible for:

Clamping the steel plate
Providing stable frictional driving force
Working with the upper roller to form a clamping area
Assisting in sheet metal positioning
Controlling the position of the sheet metal through the rolling area

One of the biggest features of a four-roll mill is its ability to reliably clamp the steel plate using both upper and lower rollers.

3) Left Roller

The left roller is mainly used for:

Pre-bending the left end of the sheet metal
Controlling the rolling radius
Supporting the sheet metal
Adjusting the bending trajectory of the sheet metal

4) Right Roller

The right roller works in conjunction with the left roller to complete the pre-bending of the other end and continuous rolling.

Therefore, a four-roll mill can achieve a typical process:

Clamping → Front pre-bending → Rolling → Rear pre-bending → Rounding

This is also an important reason why four-roll mills are suitable for continuous production of medium-thick plates.

3. Core Working Principle of W12 25X3200 Plate Rolling Machine

The basic principle of a 4-roll plate bending machine can be summarized as follows:

The upper and lower rollers clamp the steel plate, and the positional changes of the left and right side rollers create a bending moment. As the work rollers rotate, the plate gradually undergoes plastic deformation, ultimately forming the target cylinder, cone, or curved surface.

Simply put:

The upper and lower rollers are responsible for “clamping”
The side rollers are responsible for “bending”
The drive system is responsible for “feeding”
The control system is responsible for “positioning”

All four work together to complete the plate bending process.

4. Typical Rolling Process For W12 Roll Bending Machine

Step 1: Steel Plate Loading

The steel plate, after shearing, laser cutting, or other processing, is placed at the feeding position of the rolling machine.

For large-size steel plates (25mm thick), the following configurations are recommended:

Feeding platform
Front-end support device
Lifting equipment
Plate positioning device
Lateral centering device

Large steel plates are heavy, and manual handling is not only inefficient but also prone to collisions and safety risks.

Step 2: Plate Centering

After the steel plate enters between the upper and lower rollers, it needs to be laterally centered.

Centering accuracy directly affects:

Parallelism of both ends of the cylinder
Cylinder axis
Cone angle
Weld position
Subsequent assembly accuracy

For 3200mm wide steel plates, it is recommended to establish a clear centering benchmark in the production process.

Step 3: Lower Roller Lifting and Clamping

The lower roller moves upward, pressing the steel plate between the upper and lower rollers.

At this point, it is necessary to ensure that: the clamping force is sufficient but not excessive.

Insufficient clamping may lead to:

Sheet slippage
Instantaneous rolling radius
Surface scratches
Sheet misalignment

Over-clamping may increase the load on the roller system and hydraulic system.

5. Core Technological Advantages

1) Complete all processes in one clamping

Automatic pre-bending of both ends
No need for repeated edge changes
Forming efficiency increased by 30%+

Suitable for mass production

2) High-precision rolling capability

Hydraulic synchronous control accuracy up to ±2mm
Good roundness, short straight edges

Suitable for pressure vessel grade products

3) Strong heavy-duty structural design

Frame: Q235 welded + integral machining
Roller: 42CrMo forged + quenched
Hardness: HRC45-55 (surface)

Strong resistance to deformation, suitable for thick plate processing

4) Automation and CNC capabilities

CNC control (PLC/touch screen)
Automatic positioning side rollers
Parameter memory function

Supports consistent batch production

5) Expandable automation system

Optional configurations:

Upper bracket (large diameter rolling)
Side bracket (anti-collapse)
Automatic feeding table
Conical rolling device

Suitable for automated production line integration

W12 25X3200 Four-Roll Plate Rolling Machine

25mm medium-thick plate × 3200mm wide plate × Four-roll double-end pre-bending

For 25mm medium-thick steel plates, the four-roll structure reduces repeated clamping and manual adjustment, which is beneficial to improving production efficiency and batch processing consistency. The pre-bending and continuous rolling capabilities of the four-roll machine are also important features that distinguish it from traditional three-roll machines.

High-rigidity roller system · Powerful hydraulic drive · Precise CNC positioning · Double-end pre-bending · High-efficiency rolling · Stable rounding

Using a high-rigidity four-roll structure and hydraulic drive system, it can realize integrated processing of multiple processes such as sheet clamping, double-end pre-bending, continuous rolling, and rounding. It can efficiently form cylindrical, arc-shaped and conical workpieces for industries such as pressure vessels, storage tanks, steel structures, wind power, petrochemicals and large equipment manufacturing.