Low-cost magnesium alloy plate controlled edge crack rolling method

Abstract

The invention particularly relates to a low-cost magnesium alloy plate controlled edge crack rolling method, and belongs to the technical field of metal material processing. The method aims to solve the problems that in existing magnesium alloy plate industrial rolling, edging or forging and pressing prefabricating convexity is large in difficulty and the convexity shape is difficult to control; atongue type defect is serious and cutting area is large; and the rolling procedures are more, and the temperature drop of a plate is more obvious. The invention discloses a low-cost magnesium alloy plate controlled edge crack rolling method. The method comprises the processes of machining prefabricating edge part convexity, first-pass large-pressure lower axial rolling, small-pressure lower crossrolling, low-temperature finish rolling and the like. The invention provides a rolling method capable of reducing the cost and effectively controlling the generation of edge cracks. The method carries out composite optimization on large-pressure lower axial rolling, prefabricating edge part convexity, and cross rolling processes which are applied to a magnesium alloy plastic deformation early anda metal surface machining process. The method provides technical support for improving the yield, refining grains and promoting magnesium alloy plate large-scale application, and has wide applicationprospects.

Description

technical field [0001] The invention belongs to the technical field of metal material processing, and in particular relates to a low-cost magnesium alloy sheet material edge cracking-controlled rolling method. Background technique [0002] The lightweight characteristics of magnesium alloys make it widely used in many fields. However, due to its narrow deformation temperature range, poor low-temperature deformation ability, and special crystal structure, it is easy to produce severe deformation when rolling under high pressure. The cracks at the edge of the plate caused problems such as low yield of the plate and a substantial increase in production costs, which seriously hindered the development of the magnesium alloy industry. As the most economical processing method to improve mechanical properties, rolling deformation under high pressure is used in Magnesium alloys are widely used in the field of processing, so it is urgent to invent a rolling process that can effectivel...

AI Technical Summary

Problems solved by technology

[0002] The lightweight characteristics of magnesium alloys make it widely used in many fields. However, due to its narrow deformation temperature range, poor low-temperature deformation ability, and special crystal structure, it is easy to produce severe deformation when rolling under high pressure. The cracks at the edge of the plate caused problems such as low yield of the plate and a substantial increase in production costs, which seriously hindered the development of the magnesium alloy industry. As the most economical processing method to improve mechanical properties, rolling deformation under high pressure is used in Magnesium alloys are widely used in the field of processing, so it is urgent to invent a rolling process that can effectively control edge cracks without greatly increasing costs

To solve this problem, methods such as cross rolling and edge deformation pre-modification (MAS) rolling have been proposed, but the rolling effect is not good when the billet is thick, and the ideal grain refinement effect cannot be achieved.

[0003] Methods such as cross rolling and MAS rolling have obvious effects on the rolling crack control of magnesium alloy sheets. However, these rolling methods have the following outstanding problems to varying degrees: ① such as In the rolling process, when the thickness of the blank is large, it is difficult to prefabricate the crown through vertical rolling or forging, and the shape of the crown is difficult to control; ② such as the cross rolling process, when the rolling reduction is large, serious tongue-shaped defects occur This leads to a larger resection area in the later stage; ③There are more rolling processes, and the temperature drop of the plate is more obvious, which is more unfavorable for crack control

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