Straightening Roller Bank

Product Specifications

Technical details and manufacturing context for Straightening Roller Bank

Definition

The Straightening Roller Bank is a critical component of the Withdrawal and Straightening Unit, typically found in continuous processing lines for metal, plastic, or composite materials. It consists of multiple rollers mounted in a specific staggered or offset pattern. As the material passes through this bank, the rollers apply controlled bending forces in alternating directions, progressively eliminating coil set, crossbow, camber, or other forms of distortion introduced during previous manufacturing stages like rolling, coiling, or heat treatment. Its primary role is to ensure the output material meets strict flatness, straightness, and dimensional tolerances required for downstream operations or final product specifications.

The bank operates on the principle of reverse bending. The material is fed sequentially between pairs of rollers. Each roller pair is slightly offset vertically or horizontally relative to the adjacent pairs. This offset creates a series of alternating bend points along the material's length. As the material yields plastically at these bend points, the internal stresses causing the curvature are neutralized. The degree of straightening is controlled by adjusting the penetration depth (nip) of the rollers and the tension applied to the material as it is pulled through the bank by the withdrawal unit.

Typical configurations include 5 to 11 rollers, with roller diameters from 60 to 200 mm, face widths from 200 to 2500 mm, and pitches from 80 to 300 mm. Straightening speeds range from 5 to 60 m/min, achieving a straightening precision of ≤0.5 mm/m. The bank can handle materials with yield strength up to 960 MPa. Rollers are commonly made of alloy steel (GCr15 or 42CrMo) with hardness HRC 50–60, and may be chrome-plated or carbide-coated for wear resistance. The machine weight ranges from 5 to 30 tons, and installed power from 15 to 150 kW. Operating pressure, if applicable, is 1.0–1.6 MPa. All values are reference ranges; verify model-specific data with the manufacturer.

Working Principle

The bank operates on the principle of reverse bending. The material is fed sequentially between pairs of rollers. Each roller pair is slightly offset vertically or horizontally relative to the adjacent pairs. This offset creates a series of alternating bend points along the material's length. As the material yields plastically at these bend points, the internal stresses causing the curvature are neutralized. The degree of straightening is controlled by adjusting the penetration depth (nip) of the rollers and the tension applied to the material as it is pulled through the bank by the withdrawal unit.

Common Materials

Alloy Steel, Chrome-Plated Steel, Carbide

Technical Parameters

Parameter	Typical range	Notes & selection driver
Number of Rollers	5–11 pcs	Determines straightening capacity and material thickness range
Roller Diameter	60–200 mm	Larger diameters for thicker materials
Roller Face Width	200–2500 mm	Must match material width
Roller Pitch	80–300 mm	Affects straightening precision and material thickness
Straightening Speed	5–60 m/min	Higher speeds reduce precision
Straightening Precision	≤0.5 mm/m	Typical flatness tolerance
Material Yield Strength	≤960 MPa	Maximum yield strength of processed material
Roller Hardness	HRC 50–60 HRC	Higher hardness improves wear resistance
Roller Material	GCr15 / 42CrMo	Alloy steel for durabilityGB/T 18254
Machine Weight	5–30 t	Depends on size and configuration
Installed Power	15–150 kW	Depends on roller size and speed

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

Straightening Roll
The primary working element that contacts and applies bending force to the material. Often driven or idler.

Material: Hardened Alloy Steel
Roller Bearing Housing
Supports the roller shaft, allows for smooth rotation, and often incorporates adjustment mechanisms for nip control.

Material: Cast Iron or Steel
Adjustment Screw / Mechanism Part
Allows precise vertical or horizontal positioning of individual rollers to set the penetration depth and straightening force.

Material: Alloy Steel
Support Frame Part
Provides structural rigidity and alignment for the entire roller bank assembly within the unit.

Material: Structural Steel

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Withdrawal and Straightening Unit

View system integration details

Manufacturers of Straightening Roller Bank

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Frequently Asked Questions

What materials can be processed with a straightening roller bank?

The bank is designed for metal, plastic, or composite materials. The maximum yield strength of the processed material is up to 960 MPa, as per reference data. The actual material compatibility depends on the specific model and roller configuration.

How is straightening precision defined and what values are typical?

Straightening precision is typically expressed as flatness tolerance in mm per meter length. Reference values indicate ≤0.5 mm/m. This is a general range; the achievable precision depends on material properties, roller settings, and line speed.

What are the key parameters to verify when selecting a roller bank?

Key parameters include number of rollers (5–11), roller diameter (60–200 mm), face width (200–2500 mm), roller pitch (80–300 mm), straightening speed (5–60 m/min), and installed power (15–150 kW). Always confirm these with the manufacturer for your specific application.

What maintenance signals indicate wear or misalignment?

Signs include reduced straightening precision, increased vibration, unusual noise, or visible roller surface wear. Roller hardness (HRC 50–60) and material (GCr15/42CrMo) affect wear resistance. Regular inspection and adjustment of roller nip and alignment are recommended.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

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pressure:	Max 10 bar (145 psi) hydraulic pressure on roller bearings
other spec:	Material thickness range: 0.5-50 mm, Roller surface speed: 0.1-5 m/s, Alignment tolerance: ±0.1 mm/m
temperature:	Ambient to 150°C (302°F) for standard seals, higher with specialized materials

Product Specifications

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