Cold Rolling for Precision Material Thickness

Manufacturing method for producing high-hardness thin metal strips with improved surface properties. The method involves a two-stage finish cold rolling process with specific roll conditions. The rolls have low roughness (Ra 0.02-0.08 µm, Rz 0.2-1.0 µm) for the first stage with 3-10 passes. The second stage has fewer passes with reduced roll force (10-95% of max mill load) and lower roughness rolls (Ra 0.015 µm, Rz 0.1 µm). This allows transferring roll texture to the strip without excessive roughness. The thin strip has a thickness of 0.1 mm or less, hardness 170 HV or more, Ra 0.1 µm or less, Rz 1.0 µ

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Rolling method to reduce ear formation in high purity Al-Mg alloy sheets. The method involves a specific hot rolling and cold rolling sequence. The hot rolling has a total reduction of 295% and final temperature of 220-300°C. The cold rolling has a total reduction of 90%. After one cold rolling, the sheet is annealed, secondary cold rolled, and finally annealed again. This sequence reduces ear formation below 3%. The hot rolling promotes texture formation, while the cold rolling and annealing steps weaken it.

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Reducing the "S" bend in ultra-thin cold-rolled nickel strips through a spoke design and heat treatment process. The spoke design involves using a four-spoked reversing rolling mill in rough and intermediate rolling, with a convex-radian upper spoke to adjust thickness difference. In finishing rolling, a six-spoked mill with hydraulic pumped intermediate spokes ensures balance. The heat treatment involves continuous bright annealing with tension control at the winding end.

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Micro-deformation rolling process for texturing aluminum alloys using conventional four-spoke cold rolling mills instead of specialized texturing mills. The process involves adjusting the initial radial shapes of the supporting and working spokes, using bending spokes, and optimizing rolling conditions to achieve surface roughness re-engraving instead of normal deformation rolling. This allows producing textured aluminum alloys with stable, uniform roughness using regular rolling mills.

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Method to improve the properties of Al-Mg-Li alloy sheets by optimizing the rolling and annealing process during sheet production. The method involves using a specific sequence of rolling passes with controlled reductions, followed by intermittent annealing steps. The sequence starts with high reduction passes early on, then gradually lowers the reduction in later passes. The annealing steps are initially warm, but transition to cold rolling towards the end of the process. This sequence helps prevent cracking during rolling and improves the ductility and superplasticity of the finished sheets.

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A cold rolling process for producing magnesium or magnesium alloy foil with improved yield, efficiency, and reduced scrap compared to conventional methods. The process involves small incremental cold rolling steps instead of large deformations. This allows coordinated deformation of twin, shear, and slip systems rather than isolated slip deformation. It avoids twin and shear deformation sources for crack initiation while activating twin and shear bands to change grain orientation. Repeated small deformations coordinate twin, shear, and slip for improved cold rolling and foil production.

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Suppressing ridging defects in aluminum-magnesium-silicon alloy sheets during cold rolling to improve formability and reduce surface defects like ridging. The method involves selectively keeping one of the work rolls idle during certain rolling passes, including the last pass. This additional shear strain prevents growth of the goss orientation that causes ridging. It allows controlled deformation to suppress the ridging phenomenon instead of passive methods like adjusting alloy composition. By applying shear in both directions during rolling, it improves lowering property and reduces reliance on post-forming processes.

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Cold rolling of aluminum and aluminum alloys with higher initial thicknesses than usual down to final thicknesses below 0.3 mm on a one-way quarto cold rolling mill without additional devices. The key is an optimized reduction pass schedule that allows cold rolling thicker material without additional equipment. This is achieved by calculating the roll gap and reduction ratio for each pass based on the initial thickness using a specific puncture calculation. The roll gap and reduction ratio are determined for the first pass based on the initial thickness, and then for all subsequent passes using the same calculation. This optimized pass schedule allows rolling thicker material down to very thin final gauges on a standard one-way quarto cold rolling mill without needing additional equipment.

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