Many aspects of the metallic shell and the method for manufacturing the same can be better understood with reference to the following drawings. These drawings are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the present metallic shell and the method for manufacturing the same. Moreover, in the drawings like reference numerals designate corresponding parts throughout the several views. Wherever possible, the same reference numbers are used throughout the drawings to refer to the same or like elements of an embodiment.
The present metallic shell and the method for manufacturing the same are described here, in conjunction with
Referring to
Referring also to
Step S1 is performed to form a base shell made of a metal (e.g., aluminum, titanium, or an alloy thereof, or stainless steel). The base shell can be formed by various kind of metal forming technology. In a beneficial embodiment, the base shell is initially formed by punching.
Following, step S2 is enacted to grind an exterior surface of the base shell. At this step, some impurities and/or some burrs can be removed from the exterior surface of the base shell.
Then, in step S3, the ground base shell is burnished. During this step, the base shell is burnished to eliminate scuffing on the exterior surface of the base shell.
Step S4 includes washing and cleaning of the burnished base shell, applying such a degreaser as a NaOH (sodium hydroxide) alkaline solution, a surfactant, etc. Impurities, such as oil impurities, lubricant impurities, etc., are washed/cleaned from the base shell.
After that, step S5 is carried out to engrave and form the grippable portion 20 of the exterior surface of the present provided base shell. An engraving machine (not shown) is used during this step S5. Referring further to
During milling, the milling slide 304 combined with the milling tool 306 firstly rotates about a central axis of the milling slide 304 at high speed, while moving in a longitudinal direction with respect to the base shell 200. The exterior surface of the base shell 200 is milled to form a first recessed portion (not shown). The first recessed portion is of parabolic shape due to the milling slide 304 being larger than the shorter side 204 of the base shell 200.
The milling slide 304 combined with the milling tool 306 then continues rotating about a central axis thereof at high speed, whilst stopping to move longitudinally and thus maintain its previous height relative to the base shell 200. The machining platform 302 combined with the base shell 200 slowly moves transversely relative to the milling tool 306. In other words, the base shell 200 moves along the longer side 202 of the base shell 200. During this process, the exterior surface of the base shell 200 is milled twice with the milling tool 306. During the first milling step, a plurality of parabolic first recessed portions is milled. The first recessed portions are spaced from each other and are arranged evenly on the exterior surface of the base shell 200.
During the second milling step, a plurality of parabolic second recessed portions (not shown) is milled. The second recessed portions are formed in/at respective intersections with the first recessed portions. The second recessed portions are also spaced from each other and are arranged at even intervals along the exterior surface of the base shell 200. Thus, the first and second recessed portions cooperatively form the recessed parabolic sections. The recessed sections cooperatively form the grippable portion 20 of metallic shell 100, which is thereby given a texture approximating that of wood. In the example illustrated in
Step S6 includes an anodic treatment of the milled base shell. Corrosion resistance and wear resistance are thus enhanced.
Therefore, the preferred metallic shell 100 is finally formed by the aforementioned method. The exterior surface of metallic shell 100 includes the grippable portion 20 formed thereon for improving grip and thereby facilitating surer handling thereof. In other words, a plurality of recessed sections of the metallic shell 100 is configured in such a particular manner (i.e., each arranged/distributed in a parabolic shape) such that the metallic shell 100 cannot easily slide when held by another surface. Furthermore, the metallic shell 100, manufactured by the aforementioned method, has a high corrosion and wear resistance.
It is to be understood, however, that even through numerous characteristics and advantages of the present invention have been set forth in the foregoing description, together with details of the structure and function of the invention, the disclosure is illustrative only, and changes may be made in detail, especially in matters of shape, size, and arrangement of parts within the principles of the invention to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.
Number | Date | Country | Kind |
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200610063189.4 | Oct 2006 | CN | national |