Preparation method of magnesium alloy matt thin strip for mobile phone shell

Abstract

The invention discloses a preparation method of a magnesium alloy matt thin strip for a mobile phone shell. The preparation method is characterized in that a laser roughening roller is used for rolling in the final pass of a cold rolling process, thus the surface roughness of a board is uniform and a good matt effect is achieved. Compared with a magnesium alloy board subjected to chemical matt treatment, the loss of the magnesium alloy raw material is reduced by 15-30%, and the no silking and pine grains are generated on the surface of the board. In the preparation method, alloying elements of the magnesium alloy are adjusted, thus the alloy has excellent surface quality and is suitable for preparing the matt surface. The prepared thin strip finished product has excellent mechanical properties, wherein the tensile strength is 280-320MPa, the elongation percentage is 8-10%, the earing rate is reduced to 1-3%, and the average strain ratio is 1.2-1.6; the adhesive force of painting on the surface of the magnesium alloy thin strip is improved; and the coating performance of the thin strip is improved.

Description

technical field

[0001] The invention relates to the field of metal material processing, in particular to a method for preparing a magnesium alloy matt thin strip for a mobile phone casing. Background technique

[0002] With the widespread entry of mobile phones into people's lives and adapting to development trends such as light weight and portability, the demand for magnesium alloys has increased sharply. In the electronics industry, compared with the corresponding die-casting products, the mobile phone case produced by magnesium alloy sheet stamping technology has the advantages of thinner wall and higher productivity. Therefore, magnesium alloy stamping parts have good application prospects, and the development of magnesium alloy sheet stamping and related technologies has important theoretical significance and social benefits. However, because the magnesium alloy crystal structure is hexagonal close-packed (Hcp), the plasticity is poor, forming is difficult, and the yie...

Examples

Embodiment 1

[0017] A method for preparing a magnesium alloy matt thin strip for a mobile phone case, the preparation method comprising the following steps:

[0018] 1) In weight percentage, the magnesium alloy contains 0.5% of Mn, 1.5% of Si, 0.8% of yttrium, 1.2% of Cu, 0.3% of Zn and the rest of Mg are mixed and cast to obtain a magnesium alloy ingot ;

[0019] 2) Heating the magnesium alloy ingot to 600°C, and annealing with heat preservation and homogenization for 6 hours;

[0020] 3) Before hot-rolling, heat the magnesium alloy ingot to 450°C and keep it warm for 5 hours, then hot-roll the magnesium alloy ingot to 6mm, and coil it to obtain a magnesium alloy hot-rolled coil;

[0021] 4) Multi-pass cold rolling is carried out on the magnesium alloy hot-rolled coil, and the final cold rolling is rolled with a laser textured roll. The cold rolling reduction of the final pass is 8%, and the final rolling thickness is 0.8 mm,

[0022] 5) Heat the metal temperature to 280° C. in an anne...

Embodiment 2

[0024] A method for preparing a magnesium alloy matt thin strip for a mobile phone case, the preparation method comprising the following steps:

[0025] 1) In weight percentage, the magnesium alloy contains 0.8% of Mn, 0.8% of Si, 1.2% of yttrium, 0.8% of Cu, 0.8% of Zn and the rest of Mg are mixed and cast to obtain a magnesium alloy ingot ;

[0026] 2) Heating the magnesium alloy ingot to 615°C, and annealing for 4 hours with heat preservation and homogenization;

[0027] 3) Before hot-rolling, heat the magnesium alloy ingot to 470°C and keep it warm for 3 hours, then hot-roll the magnesium alloy ingot to 8mm, and coil it to obtain a magnesium alloy hot-rolled coil;

[0028] 4) Multi-pass cold rolling is performed on the magnesium alloy hot-rolled coil, and the final cold rolling is rolled with a laser textured roll. The cold rolling reduction of the final pass is 15%, and the final rolling thickness is 0.5 mm,

[0029] 5) Heat the metal temperature to 310° C. in an annea...

Embodiment 3

[0031] A method for preparing a magnesium alloy matt thin strip for a mobile phone case, the preparation method comprising the following steps:

[0032] 1) In weight percentage, the magnesium alloy contains 0.6% of Mn, 1.1% of Si, 1.0% of yttrium, 0.9% of Cu, 0.6% of Zn and the rest of Mg are mixed and cast to obtain a magnesium alloy ingot ;

[0033] 2) Heating the magnesium alloy ingot to 610°C, and annealing for 5 hours with heat preservation and homogenization;

[0034] 3) Before hot-rolling, heat the magnesium alloy ingot to 460°C and keep it warm for 4 hours, then hot-roll the magnesium alloy ingot to 7mm, and coil to obtain a magnesium alloy hot-rolled coil;

[0035] 4) Multi-pass cold rolling is carried out on the magnesium alloy hot-rolled coil, and the cold rolling of the final pass is rolled with a laser textured roll. The cold rolling reduction of the final pass is 10%, and the final rolling thickness is 0.6 mm,

[0036] 5) Heat the metal temperature to 300° C. ...

technical field

[0001] The invention relates to the field of metal material processing, in particular to a method for preparing a magnesium alloy matt thin strip for a mobile phone casing. Background technique

[0002] With the widespread entry of mobile phones into people's lives and adapting to development trends such as light weight and portability, the demand for magnesium alloys has increased sharply. In the electronics industry, compared with the corresponding die-casting products, the mobile phone case produced by magnesium alloy sheet stamping technology has the advantages of thinner wall and higher productivity. Therefore, magnesium alloy stamping parts have good application prospects, and the development of magnesium alloy sheet stamping and related technologies has important theoretical significance and social benefits. However, because the magnesium alloy crystal structure is hexagonal close-packed (Hcp), the plasticity is poor, forming is difficult, and the yie...

Examples

Embodiment 1

[0017] A method for preparing a magnesium alloy matt thin strip for a mobile phone case, the preparation method comprising the following steps:

[0018] 1) In weight percentage, the magnesium alloy contains 0.5% of Mn, 1.5% of Si, 0.8% of yttrium, 1.2% of Cu, 0.3% of Zn and the rest of Mg are mixed and cast to obtain a magnesium alloy ingot ;

[0019] 2) Heating the magnesium alloy ingot to 600°C, and annealing with heat preservation and homogenization for 6 hours;

[0020] 3) Before hot-rolling, heat the magnesium alloy ingot to 450°C and keep it warm for 5 hours, then hot-roll the magnesium alloy ingot to 6mm, and coil it to obtain a magnesium alloy hot-rolled coil;

[0021] 4) Multi-pass cold rolling is carried out on the magnesium alloy hot-rolled coil, and the final cold rolling is rolled with a laser textured roll. The cold rolling reduction of the final pass is 8%, and the final rolling thickness is 0.8 mm,

[0022] 5) Heat the metal temperature to 280° C. in an anne...

Embodiment 2

[0024] A method for preparing a magnesium alloy matt thin strip for a mobile phone case, the preparation method comprising the following steps:

[0025] 1) In weight percentage, the magnesium alloy contains 0.8% of Mn, 0.8% of Si, 1.2% of yttrium, 0.8% of Cu, 0.8% of Zn and the rest of Mg are mixed and cast to obtain a magnesium alloy ingot ;

[0026] 2) Heating the magnesium alloy ingot to 615°C, and annealing for 4 hours with heat preservation and homogenization;

[0027] 3) Before hot-rolling, heat the magnesium alloy ingot to 470°C and keep it warm for 3 hours, then hot-roll the magnesium alloy ingot to 8mm, and coil it to obtain a magnesium alloy hot-rolled coil;

[0028] 4) Multi-pass cold rolling is performed on the magnesium alloy hot-rolled coil, and the final cold rolling is rolled with a laser textured roll. The cold rolling reduction of the final pass is 15%, and the final rolling thickness is 0.5 mm,

[0029] 5) Heat the metal temperature to 310° C. in an annea...

Embodiment 3

[0031] A method for preparing a magnesium alloy matt thin strip for a mobile phone case, the preparation method comprising the following steps:

[0032] 1) In weight percentage, the magnesium alloy contains 0.6% of Mn, 1.1% of Si, 1.0% of yttrium, 0.9% of Cu, 0.6% of Zn and the rest of Mg are mixed and cast to obtain a magnesium alloy ingot ;

[0033] 2) Heating the magnesium alloy ingot to 610°C, and annealing for 5 hours with heat preservation and homogenization;

[0034] 3) Before hot-rolling, heat the magnesium alloy ingot to 460°C and keep it warm for 4 hours, then hot-roll the magnesium alloy ingot to 7mm, and coil to obtain a magnesium alloy hot-rolled coil;

[0035] 4) Multi-pass cold rolling is carried out on the magnesium alloy hot-rolled coil, and the cold rolling of the final pass is rolled with a laser textured roll. The cold rolling reduction of the final pass is 10%, and the final rolling thickness is 0.6 mm,

[0036] 5) Heat the metal temperature to 300° C. ...