Method for manufacturing real aluminum using aluminum alloy capable of being applied to coil-to-uncoil process, and vehicle interior part

1. A method for manufacturing of an aluminum alloy sheet product, the method comprising:

patterning a surface of an aluminum alloy sheet with rolls such that the aluminum alloy sheet has a pattern on a surface thereof;

performing color coating over the patterned surface having the pattern by using a vacuum coater to form a color coating layer over the patterned surface; and

performing protective coating over the color coating layer by using a spray coater to form a protective coating layer over the color coating layer,

wherein the aluminum alloy sheet comprises an aluminum alloy containing silicon (Si) of 0.5 wt % or less, iron (Fe) of 1.7 to 2.0 wt %, copper (Cu) of 0.5 wt % or less, and manganese (Mn) of 2.0 to 6.0 wt %, and the remainder aluminum (Al).

2. The method of claim 1 , further comprising, prior to patterning, providing a melt aluminum alloy composition containing silicon (Si), iron (Fe), copper (Cu) and manganese (Mn) in weight % on the basis of remainder of aluminum (Al), casting the melt aluminum alloy composition into a cast alloy having an initial thickness, rolling the cast alloy to reduce the initial thickness and performing heat-treatment to make the aluminum alloy sheet, and winding the aluminum alloy sheet into a coil.

3. The method of claim 2 , wherein the heat-treatment is performed at a temperature of 300° C. to 350° C. for 20 minutes to 30 minutes.

4. The method of claim 1 , wherein the pattern is formed by rolling the aluminum alloy sheet with a pressure of 2500 kg/cm 2 to 4000 kg/cm 2 at a speed of 5 Hz to 10 Hz.

5. The method of claim 1 , further comprising, prior to patterning, uncoiling a coil of the aluminum alloy sheet.

6. The method of claim 1 , wherein the color coating layer comprises a physical vapor deposition (PVD) coating layer which contains Ti and TiC and is formed on the patterned surface of the aluminum alloy sheet in a PVD chamber under an inert gas atmosphere, a temperature of 70° C. to 120° C. and a pressure of 3.0×10 −3 Torr to 1.2×10 −2 Torr.

7. The method of claim 1 , wherein the protective coating provides the protective coating layer of a non-metallic material on the color coating layer.

8. The method of claim 7 , wherein the protective coating comprises a nano ceramic coating (NCC) which wet-coats nano ceramic paint including an inorganic binder and ceramic powders.

9. The method of claim 1 , further comprising cutting the aluminum alloy sheet having the pattern, the color coating layer, and the protective coating layer.

10. The method of claim 9 , further comprising metal-working the cut aluminum alloy sheet to make a door trim garnish.