Abstract: A device housing is provided. The device housing includes a base device housing, a decorative pattern area, and a plurality of metallic balls. The base device housing defines a plurality of receiving holes. The decorative pattern area is formed in the exterior surface of the base device housing. The metallic balls are positioned in the receiving holes and located inside or outside the decorative pattern area. A method of manufacturing the device housing is also provided.

Abstract: A surface treatment method for housings, comprising: providing a substrate made of damascus steel; and chemically etching the substrate using inorganic acid solution or inorganic salts solution to give the substrate a patterned appearance.

Abstract: A surface treatment process for coloring metal articles includes following steps. In a first step, a metal article is anodized to form a first anodic oxide layer including a first portion and a second portion on the original metal article. In a second step, the anodized metal article is dyed. In a third step, the first portion of the first anodic oxide layer is removed from the anodized metal article to partially expose a metal body of the anodized metal article. In a fourth step, the exposed metal body of the anodized metal article is anodized to form a second anodic oxide layer. In a fifth step, the exposed metal body of the metal article is dyed.

Abstract: An aluminum alloy shell (10) and a manufacturing method for making the present aluminum alloy shell are provided. The aluminum alloy shell includes a base shell (11) and a microarc oxidation coating (12). The microarc oxidation coating is formed on a surface of the base shell by micro arc oxidation processing. The manufacturing method includes steps as follows. The base shell is pretreated. The pretreated base shell is microarc oxidized to form the microarc oxidation coating thereon. The aluminum alloy shell is post treated by washing and drying.

Abstract: An engraving apparatus for engraving workpieces includes a sliding assembly (10), a cutting tool assembly (40), and a driving mechanism (30). The sliding assembly includes at least one rail (11) and at least two worktables (13). The worktables are used for carrying the workpieces, and are slidably positioned on the rail. The cutting tool assembly includes a cutter (43). The driving mechanism is used for driving the worktables and the cutting tool assembly.