Metallic frame and method of making the same

Abstract

An exemplary metallic frame ( 60 ) is formed by forging and precise machining of a workpiece. The forging process is performed before the precise machining process, a hardness of the frame is larger than that of the workpiece and a surface roughness Ra of the frame reaches about 6.4 microns. The present invention further provides a method of making the frame. The method includes as follows: feeding workpiece process ( 12 ) for providing a workpiece ( 20 ); forging process ( 14 ), the workpiece be forged to form a preform ( 40 ); and precise machining process ( 18 ), the preform be precisely machined to form a frame.

1 . A metallic frame is characterized that the frame is formed by forging and precise machining a workpiece, and the forging process is performed before precise machining, a hardness of the frame is larger than that of the workpiece and a surface roughness Ra of the frame reaches about 6.4 microns. 
   
   
       2 . The frame as claimed in  claim 1 , wherein the frame is made of stainless steel. 
   
   
       3 . The frame as claimed in  claim 2 , wherein the frame is made of SUS304I. 
   
   
       4 . The frame as claimed in  claim 3 , wherein an average Vickers hardness of the frame reaches about 300. 
   
   
       5 . A method of making a metallic frame, a hardness of the frame is larger than that of the workpiece and a surface roughness Ra of the frame reaches about 6.4 microns, the method comprising:
 feeding workpiece process for providing a workpiece;   forging process, the workpiece is forged to form a preform; and   precise machining process, the preform be precisely machined to form a frame.   
   
   
       6 . The method as claimed in  claim 5 , wherein in the precise machining process, the preform is machined by milling process. 
   
   
       7 . The method as claimed in  claim 5 , wherein the workpiece is provided by cutting a steel sheet, and a size of the workpiece is determined according to a size and a shape of a frame design. 
   
   
       8 . The method as claimed in  claim 5 , wherein the preform has a size and a shape according to the frame design. 
   
   
       9 . The method as claimed in  claim 5 , further comprising at least one of processes of edge-cutting, hole defining, and polishing. 
   
   
       10 . The method as claimed in  claim 5 , wherein in the forging process, a metallographic structure is changed, and the change of the metallographic structure results in the improvement of the mechanical properties, the hardness and the wear resistance of the frame. 
   
   
       11 . The method as claimed in  claim 5 , wherein the frame is made of SUS304I. 
   
   
       12 . The frame as claimed in  claim 11 , wherein an average Vickers hardness of the frame reaches about 300.