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Manufacturing method for wide-range fine-grained magnesium alloy thin-sheet material

a technology of fine-grained magnesium alloy and manufacturing method, which is applied in the field of sheet material, can solve the problems of low heat content, difficult to perform metal plastic rolling process, and restricted thickness reduction ratio of rolling, and achieve the effect of reducing manufacturing cos

Inactive Publication Date: 2009-05-28
CHUNG SHAN INST OF SCI & TECH ARAMENTS BUREAU M N D
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0008]It is another object of the present invention to provide a manufacturing method for wide-range fine-grained magnesium alloy thin-sheet material that reduces passes of processes of a conventional method so as to reduce the manufacturing cost. Thus the method is able to be applied to various industries.

Problems solved by technology

Firstly, in a first processing process of the material from slab to rolling plate, due to coarse grain and segregation of casting slab, it's not easy to perform metal plastic rolling processes and thickness reduction ratio of rolling is restricted.
Moreover, other problems such as low heat content of magnesium alloy, fast heat dissipation caused by high surface area / volume ratio of the sheet material, and difficulties in uniform temperature of slab / plate are also raised.
There are too many passes of processes for producing magnesium alloy rolled sheet material so that cost of production is quite high.
This restricts the applications of magnesium alloy sheet material in various industries.
Furthermore, under the restrictions of hexagonal close packing (hcp) crystal structure of the magnesium alloy, and difficulties in plastic deformation of the magnesium alloy at room temperature, the formability of these rolling sheet is not as good as other cold working sheet material (such as aluminum sheet).
Thus there are limits on forming of complicated products.

Method used

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  • Manufacturing method for wide-range fine-grained magnesium alloy thin-sheet material

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Embodiment Construction

[0024]In order to manufacture a wide-range magnesium alloy thin-sheet material that satisfies requirements of cases of 3C products, a manufacturing method for wide-range fine-grained magnesium alloy thin-sheet material includes following steps:

[0025]In the beginning, run the step S10, take a magnesium alloy billet. Then, perform an extrusion process, as shown in the step S12. The billet is extruded through a U-shaped hole 101 of an extrusion die 10 so as to get an U-shaped extruded material 2. Refer to FIG. 2, ratio of diameter of the U-shaped hole 101 to the extrusion die 10 is smaller than 0.7. The thickness of the U-shaped hole 101 ranges from 1.5 mm to 5 mm while 2.0 mm is preferred. The U-shaped extruded material 2 produced by the extrusion process is shown in FIG. 3.

[0026]Refer to the step S14, perform a pressing and leveling process. The U-shaped extruded material 2 is pressed and leveled to a wide-range sheet material. Before performing the pressing and leveling process, cut...

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Abstract

A manufacturing method for wide-range fine-grained magnesium alloy thin-sheet material is disclosed. The method includes an extrusion process and a rolling process. By the plastic deformation feature of the two processes, the wide-range fine-grained magnesium alloy thin-sheet material that satisfies the requirement of cases of 3C products with thickness of less than 1 mm is produced. Thus the method overcomes shortcomings of a conventional method that produces the material by a plurality passes of processes. Therefore, the manufacturing cost is reduced and the method is able to be applied to various industries.

Description

BACKGROUND OF THE INVENTION[0001]The present invention relates to a manufacturing method for sheet material, especially to a manufacturing method for wide-range fine-grained magnesium alloy thin-sheet material.[0002]In AZ31 and AZ61 magnesium alloy sheet industry, there are still several difficulties to be overcome. Firstly, in a first processing process of the material from slab to rolling plate, due to coarse grain and segregation of casting slab, it's not easy to perform metal plastic rolling processes and thickness reduction ratio of rolling is restricted. Once rolling temperature is increased for improving rollingability, magnesium alloy material is easy to be oxidized so that the surface finish is influenced. Moreover, other problems such as low heat content of magnesium alloy, fast heat dissipation caused by high surface area / volume ratio of the sheet material, and difficulties in uniform temperature of slab / plate are also raised.[0003]Due to hexagonal close packed crystal st...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C22C23/00
CPCC22F1/06C22C23/00B21C23/06B21C35/023
Inventor TORNG, SHANYOUNG, CHUNE-CHINGO, CHIA-MINGHONG, WEI-PIRN
Owner CHUNG SHAN INST OF SCI & TECH ARAMENTS BUREAU M N D
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