Main Bending Roller for Marine Hull Plate Bending Roller

Product Specifications

Technical details and manufacturing context for Main Bending Roller

Definition

The Main Bending Roller is the central working component of a Marine Hull Plate Bending Roller. It is the roller that directly contacts and deforms the steel plate under hydraulic or mechanical pressure, creating the curved profiles required for ship hull construction. Its precise diameter, surface hardness, and alignment are critical for achieving accurate plate curvature without causing surface defects. This component is typically made from forged alloy steel, with a material grade such as 42CrMo4 per DIN EN 10083-3, ensuring high strength and wear resistance. The roller diameter ranges from 200 to 500 mm, and its length spans 2000 to 6000 mm to accommodate various plate widths. The bending force applied can range from 500 to 3000 kN, depending on plate thickness and required curvature. Surface hardness is specified between HRC 45 and 60, and surface roughness is maintained at Ra 0.8 to 1.6 µm to ensure quality. Operating temperature limits are -10 to 60 °C, beyond which material properties may be affected. The weight of the roller varies from 2000 to 8000 kg, influencing handling and installation. Dimensional tolerances are critical: diameter tolerance is ±0.05 mm per ISO 286, and cylindricity tolerance is 0.02 mm per ISO 1101, ensuring even pressure distribution. These specifications are reference ranges and must be verified with the legal manufacturer or supplier for the specific model and application. The roller's performance directly impacts the accuracy and quality of hull plates, making it a vital part in shipbuilding.

Working Principle

The roller rotates and, in conjunction with supporting rollers, applies concentrated linear force to a steel plate positioned between them. This force induces plastic deformation along the plate's length, creating a consistent radius of curvature. The bending radius is controlled by adjusting the vertical position of the main roller relative to the support rollers and the feed rate of the plate. The roller's surface hardness and finish are critical to prevent surface defects and ensure uniform bending. The applied force must be within the specified range to achieve the desired curvature without exceeding material limits. The operating temperature should be maintained within the specified range to avoid affecting material properties. The roller's alignment and tolerances are essential for even pressure distribution and accurate bending. Regular inspection of the roller surface for wear or damage is necessary to maintain performance. If the roller shows signs of excessive wear, scoring, or deviation from specified tolerances, it should be replaced or refurbished. The bending process requires careful control of roller position and feed rate to achieve the desired curvature consistently.

Common Materials

Forged Alloy Steel

Technical Parameters

Parameter	Typical range	Notes & selection driver
Roller Diameter	200–500 mm	Determines bending force and plate contact area.
Roller Length	2000–6000 mm	Must cover max plate width.
Bending Force	500–3000 kN	Higher force for thicker plates.
Roller Surface Hardness	HRC 45–60 HRC	Wear resistance for long service life.
Surface Roughness	Ra 0.8–1.6 µm	Affects plate surface finish.
Operating Temperature	-10–60 °C	Beyond range may affect material properties.
Material Grade	42CrMo4	High strength alloy steel.DIN EN 10083-3
Weight	2000–8000 kg	Affects handling and installation.
Tolerance (Diameter)	±0.05 mm	Critical for uniform bending.ISO 286
Tolerance (Cylindricity)	0.02 mm	Ensures even pressure distribution.ISO 1101

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Roller Shaft Part
Provides the structural core and rotational axis for the roller, transmitting torque and supporting bending loads.

Material: Alloy Steel
Roller Shell/Body Part
The outer cylindrical surface that directly contacts and bends the metal plate. Often hardened and sometimes coated.

Material: Hardened Alloy Steel
Bearing Journals Part
Precision-machined ends of the shaft that interface with bearings in the machine housing, allowing smooth rotation under load.

Material: Alloy Steel

Manufacturers of Main Bending Roller

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Frequently Asked Questions

What is the Main Bending Roller used for?

It is the primary roller in a Marine Hull Plate Bending Roller that directly contacts and deforms steel plates to create curved profiles for ship hull construction.

What materials are used for the Main Bending Roller?

The roller is typically made from forged alloy steel, with a material grade such as 42CrMo4 per DIN EN 10083-3, providing high strength and wear resistance.

What are the key specifications to verify?

Key specifications include roller diameter (200-500 mm), length (2000-6000 mm), bending force (500-3000 kN), surface hardness (HRC 45-60), surface roughness (Ra 0.8-1.6 µm), and tolerances (diameter ±0.05 mm, cylindricity 0.02 mm). Always confirm with the supplier.

How does the roller affect the bending process?

The roller's diameter, surface hardness, and alignment determine the bending force and contact area, directly influencing the accuracy and quality of the plate curvature. Proper maintenance is essential to avoid surface defects.

Data Basis

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pressure:	Max 500 bar
other spec:	Plate thickness range: 5-100 mm, Roller speed: 0.5-5 m/min
temperature:	0°C to 150°C

Main Bending Roller

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