Method for making metallic cover

Abstract

An exemplary method for making a metallic cover includes the following steps: providing a raw metallic block ( 20 ); rolling a pressing machine ( 30 ) on the metallic block to form a preformed body ( 40 ); and machining the preformed body 40 in a high precision machining process to yield a metallic cover ( 60 ). The thickness of a predetermined portion of the metallic cover is different from that of other portions of the metallic cover.

1 . A method for making a metallic cover, comprising:
 providing a raw metallic block;   rolling a pressing machine on the metallic block to form a preformed body; and   machining the preformed body in a high precision machining process to yield a metallic cover, wherein the thickness of a predetermined portion of the metallic cover is different from that of other portions of the metallic cover.   
     
     
         2 . The method for making a metallic cover as claimed in  claim 1 , wherein the metallic cover is made of aluminum alloy. 
     
     
         3 . The method for making a metallic cover as claimed in  claim 1 , wherein the preformed body has a shape and size substantially the same as those of the metallic cover. 
     
     
         4 . The method for making a metallic cover as claimed in  claim 1 , wherein the pressing machine includes a rotatable press mold and a molding platform, the raw metallic block is disposed on the molding platform, and the rotatable press mold is driven to press on the metallic block and further to roll at certain angles on the raw metallic block from a first predetermined direction to a second predetermined direction. 
     
     
         5 . The method for making a metallic cover as claimed in  claim 4 , wherein the rotatable press mold includes a mold end having a mold surface facing the molding platform, and the shape of the mold surface is configured corresponding to the desired structure of the metallic cover. 
     
     
         6 . The method for making a metallic cover as claimed in  claim 5 , wherein the predetermined portion is a central portion of the cover. 
     
     
         7 . The method for making a metallic cover as claimed in  claim 6 , wherein the thickness of the mold end of the rotatable press mold deceases gradually from a central portion of the mold end to a peripheral portion of the mold end. 
     
     
         8 . The method for making a metallic cover as claimed in  claim 7 , wherein the molding platform includes a mounting surface for mounting the metallic block and the mold surface is a spherical surface. 
     
     
         9 . The method for making a metallic cover as claimed in  claim 8 , wherein the molding platform defines a though hole for receiving a push device, and the push device is configured for releasing the preformed body from the molding platform of the pressing machine by pushing the preformed body out of the molding platform. 
     
     
         10 . The method for making a metallic cover as claimed in  claim 9 , wherein the metallic block further comprises a latching stub extending from a central portion thereof, and the latching stub is configured for engaging in the though hole so as to secure the metallic block on the molding platform. 
     
     
         11 . The method for making a metallic cover as claimed in  claim 10 , wherein the latching stub comprises a non-circular cross-section corresponding to the though hole. 
     
     
         12 . The method for making a metallic cover as claimed in  claim 1 , wherein the push device is a shaft, and a cross-section of the shaft is the same as the cross-section of the latching stub. 
     
     
         13 . The method for making a metallic cover as claimed in  claim 1 , the high precision machining process is a high precision milling process. 
     
     
         14 . A method for making a metallic cover, comprising:
 providing a raw metallic block;   rolling a pressing machine on the metallic block to form a preformed body; and   machining the preformed body in a high precision milling process to yield a metallic cover, wherein the thickness of a middle portion of the metallic cover is thinner than that of other portions of the metallic cover.   
     
     
         15 . The method for making a metallic cover as claimed in  claim 14 , wherein the metallic cover is made of aluminum alloy. 
     
     
         16 . The method for making a metallic cover as claimed in  claim 15 , wherein the pressing machine includes a rotatable press mold and a molding platform, the raw metallic block is disposed on the molding platform, and the rotatable press mold is driven to press on the metallic block and further to roll at certain angles on the raw metallic block from a first predetermined direction to a second predetermined direction. 
     
     
         17 . The method for making a metallic cover as claimed in  claim 16 , wherein the rotatable press mold includes a mold end having a mold surface facing the molding platform, and the shape of the mold surface is configured corresponding to the desired structure of the metallic cover. 
     
     
         18 . The method for making a metallic cover as claimed in  claim 17 , wherein the thickness of the mold end of the rotatable press mold deceases gradually from a central portion of the mold end to a peripheral portion of the mold end. 
     
     
         19 . The method for making a metallic cover as claimed in  claim 18 , wherein the molding platform includes a mounting surface for mounting the metallic block and the mold surface is a spherical surface. 
     
     
         20 . The method for making a metallic cover as claimed in  claim 18 , wherein the molding platform defines a though hole for receiving a push device, the push device is configured for releasing the preformed body from the molding platform of the pressing machine by pushing the preformed body out of the molding platform, the metallic block further comprises a latching stub extending from a central portion thereof, and the latching stub is configured for engaging in the though hole so as to secure the metallic block on the molding platform.