Method for producing magnesium alloy sheet

Abstract

The invention relates to a method for producing a magnesium alloy sheet, comprising the following steps: casting step: fused magnesium alloy which is added with grain refiner and has the solid phase with weight proportion between 10% and 15% is supplied between at least one pair of rollers, and a board with the thickness of 4.0-6.0mm is formed by continuous casting at the temperature that is 40-50 DEG C higher than the fusion temperature of the alloy; extruding step: the magnesium alloy board which is formed by continuous casting is further extruded into a wave-shaped magnesium board, and the extruded magnesium board has the thickness within the range of 2.0-3.5mm; flattening step: the wave-shaped magnesium board is rolled and unfolded to be a tabulate magnesium board; rolling step: the tabulate magnesium board is rolled to be the thinner magnesium alloy sheet with the width of 450-500mm and the thickness of 0.5-1.5mm; surface treatment step: surface coating is carried out on the magnesium alloy sheet to prevent oxidation corrosion. The thinner magnesium alloy sheet produced by the method can be applied to 3C products.

Description

technical field [0001] The invention relates to a method for producing a magnesium alloy plate, in particular to a method capable of producing a magnesium alloy thin plate used as a shell of a 3C product. Background technique [0002] The development of electronic technology is changing with each passing day, and technological products are constantly being introduced, such as notebook computers, mobile phones, PDAs, digital cameras, and language translators. , and gradually focus on lightweight information products, and with the continuous lightweight of products, in addition to the internal components of the product itself need to be light and precise, the reduction of the product shell is one of the key points that must be broken through for lightweight products . [0003] In order to improve the defects of bulky and heavy shells of information products, magnesium alloys have been developed and used as the main material of product shells. The main reason is that magnesium...

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Problems solved by technology

[0008] From the comparative description of the above table, it can be clearly proved that magnesium alloy is the most suitable shell for thin-walled information portable instruments, but due to the limitation of the existing magnesium alloy process, it cannot be thinned anymore, and it is not because of insufficient structural strength , which means that all products have the phenomenon of Over-design (beyond design)

[0009] At present, the manufacture of magnesium alloys is mainly based on die-casting and semi-solid injection methods, and the maximum width of the magnesium alloy structure manufactured by die-casting and semi-solid injection methods is only 250mm, and the thickness reaches 0.8mm. There are many defects, such as pinholes, air holes, shrinkage cavities, cold joint lines and incomplete mold filling, so it is necessary to manually repair the soil (similar to the soil repair method of automobile sheet metal baking paint), which is time-consuming and expensive. The post-processing cost of manpower is quite high, so that the price of magnesium alloy remains high; since the above-mentioned die-casting and semi-solid injection processes are all methods of injecting molten (or semi-molten) magnesium into the mold cavity to produce finished products, Therefore, when making thin-walled casings for information portable instruments, there are often problems such as too low yield due to too many recycled materials such as runners, runners, and risers.

[0010] The general method of manufacturing metal sheets is to use continuous casting or semi-continuous casting of wide and thick plates, which are rolled into thin sheets through multiple passes. This is a mass production and highly commercialized manufacturing method. This process requires many rolling machines. Equipment, conveying devices, large factory buildings, etc., the overall investment is quite huge

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