200922741 九、發明說明： 【發明所屬之技術領域】 本發明係關於一種金屬外殼及其製作方法，特別係關 於一種應用於可攜式電子裝置中之金屬外殼及其製作方 法。 【先前技術】 隨著資訊科技之迅速發展，可攜式電子裝置如行動電 話、pda (personal Digital Assistant，個人數位助理）及 筆記本電腦等應用日益普遍，這些電子裝置外殼之美觀程 度及手感亦越來越受到人們之關注與重視。目前，金屬外 殼廣泛應用於這些可攜式電子裝置中，所述裝置之外殼對 外觀及耐磨性要求較高，習知技術中為改善金屬外殼表面 外觀，一般應用表面噴塗烤漆等方法進行裝飾，以加強並 外觀之美感。 然而，藉由喷塗烤漆等方法形成之表面耐磨性較差， 且噴塗之油漆極易磨損及剝落，影響產品外觀，不能滿足 消^者對產品外觀之要求。另，若要藉由喷塗烤漆使金屬 卜Λ又表面具有圖案化紋專，將會使加工工序更加複雜。 【發明内容】 有鑒於此，本發明提供一種表面美觀及耐磨之金屬外 殼。 另’本發明提供一種製作該金屬外殼之方法。 本發明提供一種金屬外殼，其表面形成有複數間隔佈 置且曲率相同之第一紋路及複數間隔佈置且曲率相同之第 6 200922741 二紋路，所述第一 凸起。 本發明提供一 紋路分別與所述第二紋路相交形成複數 種該金屬外殼製作方法，其包括以下步 提供一半成品’該半成 之形狀及尺寸相當； 之形狀及尺寸與該金屬外殼 一刀盤 該數控機床包括一加工機台及一設 提供一數控機床， 置於该加工機臺上方之 具； 該刀盤之周壁裝夾有一刀 該刀裝夹於該加工機臺上且使所述半成品位於 開啟所述數控機床，使該加工機台帶動該半成品 之同時’該刀具對該半成品表面進行切削加工形成: 路及所述第二紋路之金屬外殼，該切削加:之喪斤 =括該加卫機台之進給速度為_毫米/分鐘、該刀盤之 ^轉速度為2_轉/分鐘及該刀具之下刀深度為毫 相較：知技術，該金屬外殼表面形成有凹 =磨Γ產品外觀得到裝飾美化，而⑽高產品外= 相較習知技術，該金屬外殼製作方法加工 织乍’藉由滾花紋關使得該金屬外殼表面獲得呈有= 屬文^滾^，從而使該金屬外殼外觀優美，同時使兮全 屬外设表面具有耐磨之作用。 '^金 200922741 【實施方式】 請參閱圖1及圖2，本發明第一較佳實施例之金屬外殼 10,其可應用於可攜式電子裝置，如行動電話上。 金屬外殼10包括一表面12，表面12上形成有複數間隔 排布之第一紋路122及複數間隔排布之第二紋路124。所述 複數第一紋路122具有相同之曲率，所述第二紋路124具有 相同之曲率。所述第一紋路122與所述第二紋路124逆向交 錯。所謂逆向交錯係指所述第一紋路122與所述第二紋路 124有交點，且所述第一紋路122之延伸方向與所述第二紋 路124之延伸方向相對於一經過該交點之直線對稱，且該直 線位於所述第一紋路122與所述第二紋路124之延伸方向所 構成之平面上。比如，於本實施例中，第一紋路122與第二 紋路124相交於A點，第一紋路122之延伸方向（如圖2箭頭 Y所示）與第二紋路124之延伸方向（如圖2箭頭X所示）相 對於經過該A點之直線L對稱。於此需要說明係，上述所說 之逆向交錯並不意味著，每一所述第一紋路122與所述第二 紋路124均相交，而係指每一所述第一紋路122至少與一所 述第二紋路124相交。 所述第一紋路122為一橫截面呈V形之凹槽，每一第一 紋路122於金屬外殼10之表面12上形成二相對之開口端 1222，且所述第一紋路122延伸方向呈一曲線。所述第一紋 路122之深度按照實際需要可有不同之選擇，本實施例中優 選為0.28毫米，該深度係指所述第一紋路122之底部到金屬 外殼10之表面12之距離。所述第一紋路122之開口角度按照 8 200922741 實際需要可有不同之選擇，本實施例中優選為140度，該開 口角度係指形成所述第一紋路122之二凹槽壁之夾角。此 外，每二相鄰之第一紋路122共用一開口端1222。所述第二 紋路124橫截面之形狀和大小與所述第一紋路122橫截面之 形狀和大小相當，每一第二紋路124於金屬外殼10之表面12 上形成二相對之開口端1242。此外，每二相鄰之第二紋路 124共用一開口端1242。如此，於金屬外殼10之表面12上形 成複數列呈四棱錐狀之凸起126，且每一所述凸起126限定 於二相鄰之所述第一紋路122及與該二相鄰之所述第一紋 路122同時相交之二相鄰所述第二紋路124之間。所述凸起 126之排列方向與所述第一紋路122之延伸方向一致，從而 於金屬外殼10之表面12上形成優美之滚花紋。也就是說， 該滾花紋係由沿著所述第一紋路122排列之複數列凸起126 構成。 所述金屬外殼10之表面12上形成有該滾花紋，該滾花 紋不僅賦予該金屬外殼10視覺上之美感效果，同時，由於 該滾花紋直接形成於該金屬外殼10之表面12上，而不是藉 由表面喷塗烤漆等方法形成，因而可增加金屬外殼10之表 面而ί磨性。 本發明之第二較佳實施例之金屬外殼20如圖3所示，金 屬外殼20包括一表面22，表面22上形成有複數間隔排布之 第一紋路222及複數間隔排布之第二紋路224。所述第一紋 路222為一橫截面呈V形之凹槽，每一第一紋路222於金屬 外殼20之表面22上形成二相對之開口端2222。所述第二紋 200922741 路224為一橫截面呈V形之凹槽，每一第二紋路224於金屬 外殼20之表面22上形成二相對之開口端2242。金屬外殼20 與第一實施例之金屬外殼10大致相同，不同之處在於：相 鄰所述第一紋路222不共用開口端2222，而是每一開口端 2222於表面22上間隔一定之距離。此外，相鄰所述第二紋 路224不共用開口端2242，而是每一開口端2242於表面22 上間隔一定之距離。如此，於金屬外殼20之表面22上形成 複數列呈四棱臺狀之凸起226。 本發明之第三較佳實施例之金屬外殼30如圖4所示，金 屬外殼30包括一表面32，表面32上形成有複數間隔排布之 第一紋路322及複數間隔排布之第二紋路324。所述第一紋 路322為一橫截面呈V形之凹槽，每一第一紋路322於金屬 外殼30之表面32上形成二相對之開口端3222。所述第二紋 路324為一橫截面呈V形之凹槽，每一第二紋路324於金屬 外殼30之表面32上形成二相對之開口端3242。金屬外殼20 與第一實施例之金屬外殼10大致相同，不同之處在於：相 鄰所述第一紋路322共用一開口端3222,而相鄰所述第二紋 路324不共用開口端3242，而是每一開口端3242於表面22 上間隔一定之距離。如此，於金屬外殼30之表面32上形成 複數列呈三棱柱狀之凸起326。 可以理解，於第三較佳實施例中，相鄰所述第一紋路 322可不共用開口端3222，而相鄰所述第二紋路324共用一 開口端3242。 該滾花紋可藉由滚花紋雕刻技術先後二次對工件表面 10 200922741 進行雕刻加工而成。該金屬外殼材料可採用銅、鐵、鋁、 不錢鋼及鈦中之-種或其組合之合金，本發明較佳實施方 式之金屬外殼材料為鋁合金。 該具有滾花紋表面之金屬外殼之製作流程請參閱圖 5 ’製作方法具體包括以下步驟： 提供-金屬板材’並對該金屬板材進行衝壓，盆過程 屬㈣經衝壓機床衝壓、拉伸邊緣，再切除其多餘 相對鹿2而使該金屬板材形成與金屬外殼卿狀及尺寸 相對應之半成品（圖未示）。 容哭成品進行研磨，其過程係將該半成品放入- 内裝有外形為圓球等形狀之晴，於其 行震動撞擊，以去除复：：是體對該丰成品待加工表面進 對經研磨之該:成毛刺等雜質。 布輪上塗抹潤滑劑，其過程係於抛光 高速旋轉之拋光布輪摩二:：該：成品待加工表面經過與 面產生輕度之塑性使該半成品待加工表 該半成品表面之 表面之劃痕紋路，提高 0.08〜ο.1μιη。 t舁先梵度，使其粗糙度達到 等）對^半成口谁订β，先’其用脫脂劑（如鹼性溶液NaOH 塵及潤滑料雜^仃清洗，以去除該半成品上之油污、粉 對該半成品進行：if面清潔及光亮。 可利用數控（N ’、化:文雕刻加工，該滾花紋雕刻加工 _encalContr〇I)機床編程，對刀具 11 200922741 及工件運行軌跡加以控 紋加工。矛攸而實現刀具對工件進行滾花 /又化、、、文雕刻加工呈體 進行加工，gp77i ”體原理係利用刀具對工件表面 於本實施例中指於工件表面雕刻出紋路，該紋路 , θ ’L第一紋路122及所述第二紋路124。 :刀具裝夹於具有一定直 且該刀盤之直經大於兮丰点口/工之刀』外緣進订車削， 指：加工該半点口主+成扣之切削長度，該切削長度係 上該半叩日、’與該半成品進給方向相垂直之方向 f ^該丰成扣需要切削之長度。如 ^ 要係於該丰点。°^ +成扣進行二次車削。第一次車削主 車削主要係於° 12上形成所述第一紋路12 2，第二次 文货、於該+成品之表面 ^ 124’從而形成該滾花紋紋理之外觀/ ^ 文路 工機==加工之具體過程係將該半成品裝夹於加 上裝臺上方設有-刀盤，於刀盤之周壁 产為14〇声/、亚 尖朝向工作臺，該刀具之切削角 勻球杆$A 数控加工時，由加工機臺帶動該半成品 削二：ίΓ轉之刀具之下方對該半成品表面進行車 0 28^； Λ'? 5 。八精度控制約於-0.02毫米〜〇.〇2g f $， 該加工機臺帶動訪盅丄 么笔木之間，R恰 分鐘"丰成品做進給運動，進給量為800毫米/ 二半；?：速旋轉之刀具對該半成品表面第-次車削， 成°°表面形成具有開口方向-致、依文排列之大致 呈抛物線形狀之第一咬路19? “ I依—人排列之大致 ㈣於刀盤上之刀具繞主軸作 〜+成品相對刀具移動’且因刀盤直徑大於該半 12 200922741 成品之切削長度，因此於該半成品移動過程中，該刀盤上 之刀具可第二次車削該半成品，經過第二次車削形成與第 -紋路122之㈣方向相反、依:欠排狀纽呈抛物線形狀 之第二紋路124，從而形成具有凹凸滾花紋紋理之金屬外殼 可以理解，於金屬外殼1〇上形成有該滾花紋紋理後， 還可對金屬外殼10進行陽極處理，其過程係將金屬外殼⑺ 置於陽極處理槽中，該陽極處理槽中盛裝有濃度約 〇.2g/ml之硫酸溶液之電解液，將金料殼卿為陽極，於 卜，电机作用下進行電解約3〇〜4〇分鐘，使金屬外殼表 士形成有夕孔之氧化物薄膜。為得到多種色彩之金屬外 需對其進行染色，由於該氧化物薄膜之凹孔具有吸附 ^ 之作用，·金屬外殼1G放人染色槽中時，可將金屬外 设染色，以達到所需顏色。然後將金屬外殼10放入裝有封 槽中進行反應，使封孔液中之樹脂懸浮顆粒植入 2勿薄膜中’使其表面形成硬膜，以提高金屬外殼之耐 腐f及耐磨性，且使金屬外殼表面更具光澤亮度。 攸對該半成品進行研磨處理到對該半成品進行清洗處 口’該莽步驟係為了對該半成品進行表面處理。對該半成 Γ之進行表面處理’主要係為了去除該半成品表面之油 二=以及提高該半成品表面之平整度與光亮度，從而 车1成品之表面清潔光亮。因此’完全可以理解，對該 t進订表面處理可於對該半成品進行滚花紋工 俊進行。 可以理解’該半成品並不局限於藉由對該金屬板材進 13 200922741 行衝壓之方法而制得，其可藉由金屬射出成型或粉末冶金 等方法制得。 此外，數控機床於加工時設置之加工參數不同都會使 滾花紋之形狀、深度有所不同，如進給量或刀盤直徑之不 同會使滾花紋之形狀有所不同。當然、，當僅需對金屬外殼 10之表面12局部形成該滚花紋時，該刀盤直徑也可等於 或小於金屬外殼10之寬度。此外，金屬外殼1〇之進刀次 數，按照需要也可以適當增加，如於本實施例中，可分四 人進刀，每次下刀深度約〇 〇7毫米，如此，可實現對金屬 ，喊ίο進行超精密加工。另，由該方法製作而成之金屬外 设不僅適用於行動電話，也可以應用於其他可攜式電 置及其他領域中。 、 (=上所述，本發明符合發明專利要件，t依法提出專 】申:准，以上所述者僅為本發明之較佳實施例，本發 月之範圍並不以上述實施例為限，舉凡熟習本案技藝之人 士k依本發明之精神所作之等效修飾或變化，皆應涵蓋於 以下申凊專利範圍内。 【圖式簡單說明】 圖1知本發明第一較佳實施例之金屬外殼示意圖； 圖2係圖1所示金屬外殼II位置之局部放大圖； 圖3係本發明第二較佳實施例之金屬外殼示意圖； 圖4係本發明第二較佳實施例之金屬外殼示意圖； 圖5係圖}所示金屬外殼之製作流程圖。 14 200922741 【主要元件符號說明】 金屬外殼 10 、 20 、 30 表面 12 、 22 、 32 第一紋路 122 、 222 ' 322 開口端 1222、1242、2222 .、2242、3222、3242 第二紋路 124 ' 224 、 324 凸起 126 、 226 、 326 15BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal casing and a method of fabricating the same, and more particularly to a metal casing for use in a portable electronic device and a method of fabricating the same. [Prior Art] With the rapid development of information technology, portable electronic devices such as mobile phones, personal digital assistants (PDAs) and notebook computers are becoming more and more popular. The aesthetics and feel of these electronic device casings are also increasing. The more attention comes to people's attention and attention. At present, the metal casing is widely used in these portable electronic devices. The outer casing of the device has high requirements on appearance and wear resistance. In the prior art, in order to improve the appearance of the surface of the metal casing, the surface is generally painted and painted to decorate the surface. To enhance and aesthetically pleasing. However, the surface formed by spraying paint and the like has poor surface abrasion resistance, and the sprayed paint is extremely easy to be worn and peeled off, which affects the appearance of the product and cannot satisfy the requirements of the appearance of the product. In addition, the process of making the metal dip has a patterned pattern by spraying the lacquer, which will make the processing process more complicated. SUMMARY OF THE INVENTION In view of the above, the present invention provides a metal casing having an aesthetically pleasing appearance and wear resistance. Another invention provides a method of making the metal casing. The present invention provides a metal casing having a plurality of first grooves arranged at equal intervals and having the same curvature and a plurality of spaced intervals and the same curvature of the sixth 200922741 two-grain road, the first protrusion. The present invention provides a method for forming a plurality of the metal casings respectively, and the method includes the following steps: providing a half finished product, the shape and size of the semi-finished product; the shape and size of the metal casing and the cutterhead The numerical control machine tool comprises a processing machine and a device for providing a numerical control machine tool, which is placed above the processing machine; the peripheral wall of the cutter head is clamped with a knife, the knife is clamped on the processing machine table and the semi-finished product is located Opening the CNC machine tool to enable the processing machine to drive the semi-finished product while the tool is cutting the surface of the semi-finished product to form: a metal shell of the road and the second grain, the cutting plus: The feeding speed of the machine table is _mm/min, the turning speed of the cutter head is 2_rev/min, and the depth of the knife under the tool is milliphase: knowing the technology, the surface of the metal casing is formed with concave = grinding ΓThe appearance of the product is decorated and beautified, and (10) The outside of the product is higher than the conventional technology. The method of manufacturing the metal casing is to process the woven fabric. Rolling ^, so that the metal casing looks beautiful, and at the same time makes the surface of the peripherals wear-resistant. '^金200922741 EMBODIMENT Referring to Figures 1 and 2, a metal casing 10 according to a first preferred embodiment of the present invention can be applied to a portable electronic device such as a mobile phone. The metal casing 10 includes a surface 12 having a plurality of spaced-apart first lines 122 and a plurality of spaced-apart second lines 124 formed thereon. The plurality of first lines 122 have the same curvature, and the second lines 124 have the same curvature. The first grain 122 and the second grain 124 are reversely intersected. The term "reverse staggered" means that the first grain 122 has an intersection with the second grain 124, and the extending direction of the first grain 122 and the extending direction of the second grain 124 are symmetrical with respect to a line passing through the intersection. And the straight line is located on a plane formed by the extending direction of the first grain 122 and the second grain 124. For example, in this embodiment, the first grain 122 and the second grain 124 intersect at point A, the direction of extension of the first grain 122 (shown by arrow Y in FIG. 2) and the direction of extension of the second grain 124 (see FIG. 2). The arrow X is symmetrical with respect to the straight line L passing through the point A. It should be noted that the above-mentioned reverse interleaving does not mean that each of the first lines 122 and the second lines 124 intersect, and that each of the first lines 122 is at least one The second lines 124 intersect. The first grain 122 is a V-shaped groove, and each of the first lines 122 forms two opposite open ends 1222 on the surface 12 of the metal casing 10, and the first grain 122 extends in a direction. curve. The depth of the first line 122 may be different according to actual needs. In this embodiment, it is preferably 0.28 mm, which is the distance from the bottom of the first grain 122 to the surface 12 of the metal casing 10. The opening angle of the first grain 122 may be different according to the actual needs of the 200922741. In the present embodiment, it is preferably 140 degrees, and the opening angle refers to the angle between the two groove walls forming the first grain 122. In addition, each of the two adjacent first lines 122 shares an open end 1222. The shape and size of the cross section of the second grain 124 are comparable to the shape and size of the cross section of the first grain 122. Each of the second lines 124 forms two opposite open ends 1242 on the surface 12 of the metal casing 10. In addition, each of the two adjacent second lines 124 shares an open end 1242. Thus, a plurality of protrusions 126 having a quadrangular pyramid shape are formed on the surface 12 of the metal casing 10, and each of the protrusions 126 is defined by the two adjacent first lines 122 and adjacent to the two The first lines 122 are simultaneously intersected by two adjacent to the second lines 124. The direction in which the protrusions 126 are arranged coincides with the direction in which the first lines 122 extend, thereby forming a beautiful knurling on the surface 12 of the metal casing 10. That is, the knurling is formed by a plurality of rows of projections 126 arranged along the first grain 122. The knurling is formed on the surface 12 of the metal casing 10, and the knurling not only imparts a visually pleasing effect to the metal casing 10, but also because the knurling is directly formed on the surface 12 of the metal casing 10 instead of It is formed by a method such as surface-spraying paint, and thus the surface of the metal casing 10 can be increased. The metal casing 20 of the second preferred embodiment of the present invention is shown in FIG. 3. The metal casing 20 includes a surface 22 on which a plurality of first lines 222 arranged at intervals and a plurality of second lines arranged in spaced intervals are formed. 224. The first pattern 222 is a groove having a V-shaped cross section, and each of the first lines 222 forms two opposite open ends 2222 on the surface 22 of the metal casing 20. The second pattern 200922741 road 224 is a groove having a V-shaped cross section, and each of the second lines 224 forms two opposite open ends 2242 on the surface 22 of the metal casing 20. The metal casing 20 is substantially identical to the metal casing 10 of the first embodiment except that the first welt 222 does not share the open end 2222, but each open end 2222 is spaced a distance from the surface 22. In addition, adjacent second traces 224 do not share open end 2242, but each open end 2242 is spaced a distance from surface 22. Thus, a plurality of protrusions 226 having a quadrangular prism shape are formed on the surface 22 of the metal casing 20. The metal casing 30 of the third preferred embodiment of the present invention is shown in FIG. 4. The metal casing 30 includes a surface 32. The surface 32 is formed with a plurality of spaced-apart first lines 322 and a plurality of spaced-apart second lines. 324. The first pattern 322 is a V-shaped groove, and each of the first lines 322 forms two opposite open ends 3222 on the surface 32 of the metal casing 30. The second pattern 324 is a groove having a V-shaped cross section, and each of the second lines 324 forms two opposite open ends 3242 on the surface 32 of the metal casing 30. The metal casing 20 is substantially the same as the metal casing 10 of the first embodiment, except that the adjacent first grooves 322 share an open end 3222, and the adjacent second grooves 324 do not share the open end 3242. Each open end 3242 is spaced a distance from the surface 22. Thus, a plurality of protrusions 326 having a triangular prism shape are formed on the surface 32 of the metal casing 30. It can be understood that, in the third preferred embodiment, the adjacent first lines 322 may not share the open end 3222, and the adjacent second lines 324 share an open end 3242. The knurling pattern can be engraved by the knurling engraving technique on the workpiece surface 10 200922741 twice. The metal casing material may be an alloy of copper, iron, aluminum, stainless steel, titanium or a combination thereof, and the metal casing material of the preferred embodiment of the present invention is an aluminum alloy. Refer to Figure 5 for the manufacturing process of the metal shell with the knurled surface. The manufacturing method specifically includes the following steps: providing - sheet metal and stamping the sheet metal. The pot process is (4) stamping and stretching the edge by the punching machine, and then The excess relative deer 2 is cut off to form the semi-finished product (not shown) corresponding to the metal casing shape and size. The crying finished product is ground, and the process is to put the semi-finished product into a shape with a shape of a ball and the like, and shake it in a row to remove the complex:: the body is facing the surface to be processed Grinding: impurities such as burrs. Applying lubricant to the cloth wheel, the process is to polish the high-speed rotating polishing cloth wheel 2:: This: the finished surface to be processed has a slight plasticity with the surface to make the surface of the semi-finished product to be processed. The texture is increased by 0.08~ο.1μιη. t舁先梵度, to make its roughness reach, etc.) For the semi-finished person who ordered β, first 'use it with degreasing agent (such as alkaline solution NaOH dust and lubricating material miscellaneous cleaning) to remove the oil on the semi-finished product The powder is used for the semi-finished product: the if surface is cleaned and brightened. The numerical control (N ', chemical: engraving processing, the rolling pattern engraving processing _encalContr〇I) can be used to control the tool 11 200922741 and the workpiece running track. Machining. The spear is used to realize the knurling/reconstruction of the workpiece, and the engraving processing is performed in the body. The gp77i ” body principle uses the tool to engrave the surface of the workpiece in the embodiment, and the texture is engraved on the surface of the workpiece. , θ 'L first grain 122 and the second grain 124. : The cutter is clamped on the outer edge of the cutter having a straight line and the straight edge of the cutter is larger than the 兮 点 / / / The cutting length of the main point + the buckle of the half point, the cutting length is the half-day, the direction perpendicular to the feeding direction of the semi-finished product f ^ the length of the cutting buckle needs to be cut. Point. °^ + into the buckle for the second car The first turning main turning is mainly to form the first grain 12 2 on the ° 12, the second time, the surface of the + finished product ^ 124 ' to form the appearance of the embossed texture / ^ Wen Lugong Machine == The specific process of machining is to clamp the semi-finished product on the top of the loading table with a - cutter head, which produces 14 〇 sound on the peripheral wall of the cutter head, and the sub-tip is facing the work table. The cutting angle of the cutter is uniform. When the rod is $A CNC machining, the semi-finished product is cut by the processing machine. The lower part of the tool is used to drive the surface of the semi-finished product. 28 ; ? '? 5 . The eight-precision control is about -0.02 mm ~ 〇.〇 2g f $, the processing machine drives the visit between the pen and the wood, R just minutes " the finished product to do the feed movement, the feed rate is 800 mm / two halves;?: the speed of the rotary tool on the surface of the semi-finished product In the first turning, the surface forming the first bite path having a substantially parabolic shape in the direction of the opening, and the arrangement of the objects according to the text is substantially the same as that of the man. +The finished product moves relative to the tool' and the cutter diameter is larger than the half 12 200922741 The length, so that during the movement of the semi-finished product, the cutter on the cutter head can turn the semi-finished product for the second time, and after the second turning, the direction is opposite to the (four) direction of the first-grain passage 122, and the undercut is in a parabolic shape. The second grain 124 is formed to form a metal casing having a embossed texture. It can be understood that after the knurling texture is formed on the metal casing 1 , the metal casing 10 can be anodized by a metal casing (7). In the anode treatment tank, the anode treatment tank contains an electrolyte solution having a concentration of about 2 g/ml of sulfuric acid solution, and the gold shell is used as an anode, and electrolysis is carried out under the action of a motor for about 3 〇 to 4 〇 minutes. The metal outer casing is formed with an oxide film of the outer hole. In order to obtain a plurality of colors of the metal, it is required to be dyed. Since the concave hole of the oxide film has the function of adsorption, when the metal casing 1G is placed in the dyeing tank, the metal exterior can be dyed to achieve the desired color. Then, the metal casing 10 is placed in a sealing tank for reaction, so that the resin suspended particles in the sealing liquid are implanted into the film, and the surface thereof is formed into a hard film to improve the corrosion resistance and wear resistance of the metal casing. And make the surface of the metal casing more glossy. The semi-finished product is subjected to a grinding treatment to the cleaning of the semi-finished product. The crucible step is for surface treatment of the semi-finished product. The surface treatment of the semi-finished product is mainly to remove the oil on the surface of the semi-finished product, and to improve the flatness and brightness of the surface of the semi-finished product, so that the surface of the finished product of the vehicle 1 is clean and bright. Therefore, it is entirely understandable that the surface treatment of the t-stitching can be performed on the embossing process of the semi-finished product. It can be understood that the semi-finished product is not limited to being produced by the method of stamping the metal sheet into a metal sheet, which can be obtained by metal injection molding or powder metallurgy. In addition, the different machining parameters set by the CNC machine during machining will make the shape and depth of the knurling different. For example, the difference in feed rate or cutter diameter will make the shape of the knurling different. Of course, when it is only necessary to partially form the knurling on the surface 12 of the metal casing 10, the diameter of the cutter head may be equal to or smaller than the width of the metal casing 10. In addition, the number of feeds of the metal casing 1 can be appropriately increased as needed. For example, in the present embodiment, the knife can be divided into four groups, and the depth of the lower knife is about 毫米7 mm, so that the metal can be realized. Shout ίο for ultra-precision machining. In addition, the metal housing made by this method is not only suitable for mobile phones, but also for other portable devices and other fields. The invention is in accordance with the requirements of the invention patents, and the above is only a preferred embodiment of the present invention. The scope of the present month is not limited to the above embodiments. Equivalent modifications or variations made by those skilled in the art in light of the spirit of the present invention are intended to be included in the scope of the following claims. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 illustrates a first preferred embodiment of the present invention. 2 is a partial enlarged view of the position of the metal casing II shown in FIG. 1. FIG. 3 is a schematic view of a metal casing according to a second preferred embodiment of the present invention; FIG. 4 is a metal casing according to a second preferred embodiment of the present invention. Figure 5 is a flow chart of the metal casing shown in Figure 5. 14 200922741 [Description of main components] Metal casing 10, 20, 30 Surface 12, 22, 32 First grain 122, 222 '322 Open end 1222, 1242 , 2222 . , 2242 , 3222 , 3242 second lines 124 224 , 324 protrusions 126 , 226 , 326 15