The Impact of Wrinkle Prevention Rolls on Second-Hand Cold Rolling Mills​

Wrinkle prevention rolls (also called anti-wrinkle rolls) are key forming components in second-hand cold rolling mills, designed to eliminate strip wrinkling during the cold rolling process. Their performance directly influences the surface quality of cold-rolled products and the efficiency of subsequent processing.​

Wrinkle Elimination Effectiveness​

In second-hand cold rolling mills, wrinkle prevention rolls use a combination of convex roll profiles and adjustable pressure (0.2-0.8 MPa) to stretch the strip slightly across its width, eliminating transverse wrinkles (wave height ≥0.5mm) caused by uneven tension. For thin cold-rolled strips (≤0.3mm thick, e.g., automotive trim steel), this reduces wrinkle-related scrap rates by 70-80%. Without effective anti-wrinkle rolls, up to 15% of the strip may be rejected due to irreparable wrinkles, significantly increasing production costs.​

Strip Flatness Improvement​

Well-designed wrinkle prevention rolls in second-hand cold rolling mills work in tandem with the mill’s leveler to achieve a strip flatness of ≤1mm/m—meeting the strict requirements of electronic-grade steel (e.g., for transformer cores complying with IEC 60404). This flatness ensures uniform coating thickness in downstream processes (e.g., galvanizing), reducing coating waste by 10-15%. For second-hand mills with worn anti-wrinkle rolls, replacing the roll profiles to match the strip width (1000-2000mm) can restore flatness to 90% of that of a new machine.​

Production Speed Optimization​

Effective wrinkle prevention allows second-hand cold rolling mills to operate at higher rolling speeds (up to 1200m/min for thin strips) without compromising quality. In contrast, mills without functional anti-wrinkle rolls often require speed reductions of 25-30% to minimize wrinkling, leading to a 20-25% decrease in daily throughput. The rolls’ low-friction surface (typically chrome-plated, Ra ≤0.2μm) also reduces strip surface scratches, further improving product quality.​

Maintenance and Optimization Strategies​

To ensure the performance of wrinkle prevention rolls in second-hand cold rolling mills:​

• Inspect roll surface condition weekly; replace rolls if chrome plating wears off or if indentations exceed 0.1mm.​

• Adjust roll pressure monthly based on strip thickness and material type (e.g., 0.3 MPa for 0.2mm carbon steel, 0.5 MPa for 0.1mm stainless steel).​

• Check roll alignment quarterly using a laser alignment tool; adjust if parallelism deviation exceeds 0.05mm.​

• Lubricate roll bearings monthly with high-temperature grease (operating temperature up to 150°C) to prevent seizure.​

For second-hand cold rolling mills processing wide strips (≥1800mm), installing multi-segment wrinkle prevention rolls (with independent pressure control for each segment) can further improve wrinkle elimination efficiency by 30-40%, ensuring uniform flatness across the entire strip width.​

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