A method for inhibiting edge cracking of magnesium alloy sheet by using an edge damper profiled backer plate and a magnesium alloy sheet

CN121892508BActive Publication Date: 2026-06-30TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY +1

Patent Information

Authority / Receiving Office: CN · China
Patent Type: Patents(China)
Current Assignee / Owner: TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
Filing Date: 2026-03-25
Publication Date: 2026-06-30

AI Technical Summary

Technical Problem

During the rolling process of magnesium alloy sheet, the tangential tensile stress generated at the edge due to the widening can easily exceed the material's fracture limit, leading to cracks. Existing methods are difficult to effectively suppress edge cracks, and the equipment is complex and energy-intensive, making it difficult to meet the needs of continuous and low-cost production.

Method used

An edge-blocking composite liner is used. By setting a wavy textured composite liner on both sides of the magnesium alloy billet, combined with a multi-pass low-speed cumulative rolling process and micro-speed ratio rolling, the wavy flow-blocking zone applies lateral constraint and shear deformation to the edge of the magnesium alloy billet, promoting dynamic recrystallization and grain refinement, and suppressing edge cracks.

Benefits of technology

It significantly improves the yield of magnesium alloy sheets, enhances edge plasticity and toughness, ensures no macroscopic cracks at the edges, and enables continuous production of high-quality magnesium alloy sheets.

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Abstract

This invention belongs to the field of magnesium alloy rolling technology, specifically relating to a method for suppressing edge cracks in magnesium alloy sheet rolling using edge-blocking compound liners, and the magnesium alloy sheet itself. The method includes the following steps: selecting a magnesium alloy billet to be rolled; preparing compound liners, one surface of which serves as the clamping surface; clamping the magnesium alloy billet between two compound liners to form a combined billet, with both sides of the billet in contact with the clamping surfaces of the two compound liners; binding the combined billet with high-temperature resistant metal wire; preheating and holding the bound combined billet in a heating furnace; rolling the preheated combined billet using a multi-pass cumulative rolling process to obtain a magnesium alloy sheet clamped between the two compound liners; separating the magnesium alloy sheet from the two compound liners to obtain a finished magnesium alloy sheet without macroscopic edge cracks; and improving the success rate of magnesium alloy sheet rolling through the compound liners and the multi-pass cumulative rolling process.

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