1360634 六、發明說明： 【發明所屬之技術領域】 本發明係涉及一種外殼的製造方法，尤指 水器外殼的製造方法。 … 【先前技術】 既有熱水器的外殼，係較為方正的造型，主要係在前 罩前面的中間形成朝前凸出的圓弧形&，再以前罩杜人背 板與底座而成為熱水器的外殼’ $常此類的外殼左、右的 寬度較寬’藉由凸出的空間容納熱水器的内膽，再於剩餘 的空間裝設熱水器的裝置，一般來說形狀變化的差異不 大。 -般製法的熱水器的外殼構造就如同前述，·係為方正 呆板的造型，並由於左、右的寬度較内膽的直徑寬上許多， 因此也讓熱水器所佔空間的無法縮小，在美觀的構造形狀 以及所佔體積的縮小上著實有不少的改進空間。 【發明内容】 由於既有熱水器的外殼構造較為方正，因此產生佔空 間以及外觀平凡的缺點。為Λ，本發明製法的主要目的在 於，於金屬板體周圍形成凸出形狀後，加以捲繞焊接為圓 形桶身，藉此獲致能夠凸顯特殊外觀美感，同時縮小整體 所佔體積的外殼供熱水器運用。 為達到上述目的，本發明提供一種桶形熱水器外殼的 製造方法’該方法的步驟係包括： 準備金屬板體：準備一金屬板體，將金屬板體裁成矩 1360634 形； • 衝壓金屬板體：將裁成矩形的金屬板體置放於衝床， • 對金屬板體一個以上的段落進行衝壓’於金屬板體衝壓出 各沿直向延伸的隆凸部； 焊接形成桶身：依圓形的輪廓將形成有隆凸部的金屬 板體橫向捲繞並焊接為桶身； 配合桶身準備兩封蓋：配合桶身頂、底端緣的形狀準 備兩封蓋，其中於對應桶身底部的封蓋形成複數個穿孔； φ 以及 於桶身結合封蓋：將兩封蓋結合於桶身的頂、底兩端 即完成本發明的外殼成品。 進一步，本發明在所述焊接形成桶身的步驟中，由所 述金屬板體所焊接形成的桶身，在周圍具有一個以上的隆 凸部，並且未設有隆凸部的部分形成共有一個圓形中心的 圓弧部。 較佳的，本發明在所述衝壓金屬板體的步驟中，對金 鲁屬板體左、右側的兩個段落進行衝屢，於金屬板體形成兩 個所述的隆凸部，並在所述焊接形成桶身的步驟中，將所 述金屬板體捲繞焊接形成為周圍具有兩個所述隆凸部的 身。 較佳的，本發明在所述衝壓金屬板體的步驟中，對金 屬板體的三個段落進行衝壓，於金屬板體形成三個所述的 隆凸部，並在所述焊接形成桶身的步驟中，w所述金屬板 體捲繞焊接形成為周圍具有三個所述隆凸部的桶身。 較佳的，本發明在所述衝壓金屬板體的步驟中，對金 41360634 VI. Description of the Invention: [Technical Field] The present invention relates to a method of manufacturing a casing, and more particularly to a method of manufacturing a casing of a water. ... [Prior Art] The outer casing of the water heater has a more square shape. It mainly forms a circular arc shape that protrudes forward in the middle of the front of the front cover, and then becomes a water heater by the front cover and the base of the Du people. The outer casing '$ often has a wide width to the left and right of the outer casing.' The device for accommodating the water heater by the protruding space and the water heater in the remaining space generally has little difference in shape. The shell structure of the water heater is similar to the above, and it is a rigid shape, and because the width of the left and right is much wider than the diameter of the inner tank, the space occupied by the water heater cannot be reduced, and the appearance is beautiful. There is a lot of room for improvement in the shape of the structure and the reduction in the volume occupied. SUMMARY OF THE INVENTION Since the outer casing of the existing water heater has a relatively square structure, it has the disadvantage of a small space and a plain appearance. In other words, the main purpose of the method of the present invention is to form a convex shape around the metal plate body, and then wind-weld it into a circular barrel body, thereby obtaining a housing capable of highlighting the special appearance and reducing the overall volume. Water heater application. In order to achieve the above object, the present invention provides a method for manufacturing a barrel-shaped water heater housing. The method comprises the steps of: preparing a metal plate body: preparing a metal plate body, and cutting the metal plate body into a shape of 1360634; • stamping the metal plate body: Place the rectangular metal plate body on the punching machine, • press one or more paragraphs of the metal plate body to punch out the straight protrusions extending in the straight direction in the metal plate body; weld to form the barrel body: according to the circular shape The profile is formed by laterally winding and welding the metal plate body with the protuberances into the barrel body; and the cover body is provided with two covers: two caps are prepared in the shape of the top and bottom end edges of the barrel body, wherein the bottom of the corresponding barrel body The cover forms a plurality of perforations; φ and the cover of the barrel are combined: the two covers are joined to the top and bottom ends of the barrel to complete the finished product of the present invention. Further, in the step of forming the barrel by the welding, the barrel formed by welding the metal plate body has more than one protuberance at the periphery, and the portion not provided with the protuberance forms a common one. The arc of the center of the circle. Preferably, in the step of stamping the metal plate body, the present invention performs two steps on the left and right sides of the Jinluo plate body, and forms two of the above-mentioned protuberances on the metal plate body, and In the step of forming the barrel by the welding, the metal plate body is wound and welded to form a body having two of the protuberances. Preferably, in the step of stamping the metal plate body, the present invention punches three sections of the metal plate body, forms three of the protuberances on the metal plate body, and forms a barrel body in the welding. In the step of step, the metal plate body is wound and welded to form a barrel having three of the protuberances. Preferably, in the step of stamping the metal plate body, the present invention is for gold 4