Straightener / Leveler for Metal Strip

Product Specifications

Technical details and manufacturing context for Straightener / Leveler

Definition

Within a coil feeding system, the straightener/leveler is a critical component positioned after the decoiler and before the feeder. Its primary function is to correct the inherent curvature and irregularities (coil set) imparted to metal strip during the coiling process, ensuring the material entering the press or forming equipment is perfectly flat and dimensionally stable. This prevents defects in stamped, punched, or formed parts and ensures consistent feeding accuracy. The machine typically consists of a series of small-diameter work rolls arranged in an offset pattern, often staggered between upper and lower banks. As the metal strip passes through these rolls, it is subjected to alternating bending stresses beyond its yield point. This plastic deformation permanently removes the memory of the coil curvature. The number of rolls, their diameter, and the adjustment of intermesh pressure determine the leveling intensity and the final flatness achieved. Key parameters for selection include maximum strip width (300–2000 mm), strip thickness range (0.1–6.0 mm), maximum line speed (30–120 m/min), flatness tolerance (±0.05–±0.2 mm/m per ISO 1071), number of work rolls (5–23), roll diameter (40–150 mm), main motor power (15–90 kW), operating pressure (1.0–1.6 MPa), supply voltage (380–690 V AC per IEC 60038), control voltage (24 V DC ±10% per IEC 61131-2), operating temperature (-10–45 °C), ingress protection (IP54–IP65 per IEC 60529), machine weight (5–30 t), and footprint (3000×1500×1800 to 8000×3000×2500 mm). Materials on file include high-carbon chromium steel for work rolls and alloy steel for frame and housings. These values are directory reference ranges and must be confirmed with the legal manufacturer or supplier for the specific model and application. Standards listed are procurement references, not certifications. Always verify model-specific values and standards before purchase.

Working Principle

The straightener/leveler uses a series of small-diameter work rolls arranged in an offset pattern between upper and lower banks. As metal strip passes through, it undergoes alternating bending stresses beyond its yield point, causing plastic deformation that removes coil set and other irregularities. The number of rolls, their diameter, and intermesh pressure adjustment control the leveling intensity and final flatness. This process ensures the strip is flat and straight for downstream stamping or forming.

Common Materials

High-carbon chromium steel (for work rolls), Alloy steel (for frame and housings)

Technical Parameters

Parameter	Typical range	Notes & selection driver
Max Strip Width	300–2000 mm	Determines machine frame size and roll body length.
Strip Thickness Range	0.1–6.0 mm	Thicker material requires higher roll force and larger diameter rolls.
Max Line Speed	30–120 m/min	Higher speeds require more precise roll adjustment and cooling.
Flatness Tolerance	±0.05–±0.2 mm/m	Tighter tolerance demands more backing rolls and precision ground rolls.ISO 1071
Number of Work Rolls	5–23 pcs	More rolls improve flatness but increase cost and maintenance.
Roll Diameter	40–150 mm	Smaller diameter allows tighter bends but reduces stiffness.
Main Motor Power	15–90 kW	Depends on strip width, thickness, and speed.
Supply Voltage	380–690 V AC	Typical 3-phase industrial supply; other voltages on request.IEC 60038
Control Voltage	24 ±10% V DC	For PLC and sensor circuits.IEC 61131-2
Operating Temperature	-10–45 °C	Outside this range, hydraulic oil viscosity and electronics degrade.
Ingress Protection	IP54–IP65	IP65 for washdown environments; IP54 for dry shops.IEC 60529
Machine Weight	5–30 t	Heavier machines provide better stability and vibration damping.
Footprint (L×W×H)	3000×1500×1800–8000×3000×2500 mm	Varies with strip width and number of rolls.

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

Upper Roll Bank
Houses the upper set of work rolls. Often mounted in a movable carriage for pressure adjustment.

Material: Alloy steel
Lower Roll Bank
Houses the fixed lower set of work rolls, forming the base bending plane.

Material: Alloy steel
Work Rolls
The precision-ground rollers that directly contact and bend the material. They are the primary wear parts.

Material: High-carbon chromium steel (hardened and ground)
Pressure Adjustment Mechanism
Allows precise setting of the intermesh gap and bending pressure between the upper and lower roll banks, typically via motorized or manual screws.

Material: Alloy steel
Entry/Exit Guides Part
Ensure the strip enters and exits the roll banks squarely to prevent edge damage and misalignment.

Material: Tool steel or hardened alloy steel

Applied To / Applications

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

Coil Feeding System

View system integration details

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Frequently Asked Questions

What is the primary function of a straightener/leveler?

It removes coil set, crossbow, and edge wave from metal strip to produce flat, straight material for downstream processing, ensuring dimensional stability and preventing defects in stamped or formed parts.

How does the straightener/leveler achieve flatness?

The strip passes through offset work rolls that apply alternating bending stresses beyond the yield point, causing plastic deformation that permanently removes the coil curvature. The number of rolls, diameter, and intermesh pressure determine the leveling intensity.

What are the typical specifications for a straightener/leveler?

Typical ranges include strip width 300-2000 mm, thickness 0.1-6.0 mm, line speed 30-120 m/min, flatness tolerance ±0.05-±0.2 mm/m, and 5-23 work rolls. These are reference ranges; confirm with the manufacturer for your application.

What standards are relevant for straightener/leveler specifications?

Relevant standards include ISO 1071 for flatness tolerance, IEC 60038 for supply voltage, IEC 61131-2 for control voltage, and IEC 60529 for ingress protection. These are procurement references, not certifications.

Data Basis

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

Preliminary Technical Classification

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pressure:	N/A (mechanical operation, not pressure-based)
line speed:	Up to 300 m/min (984 ft/min) for standard models
temperature:	Ambient to 150°C (302°F) for standard models, up to 400°C (752°F) for high-temperature variants
strip tension:	5-50 kN (1124-11240 lbf) depending on model
strip thickness range:	0.2-6.0 mm (0.008-0.236 in)

Straightener / Leveler

Product Specifications

Applied To / Applications

Industrial Ecosystem & Supply Chain Structure

Application Fit & Sizing Matrix

Reliability & Engineering Risk Analysis

Compliance & Manufacturing Standards