Tubular case with flange and method of manufacturing the same

Abstract

There is provided a tubular case with a flange, comprising a tube head which is connected backward to a tube body. A flange extending outward is arranged at the connection between the tube head and the tube body, and a penetrated through hole is arranged inside the tube head and the tube body. The manufacturing method of the tubular case comprise of placing a blank material into the mold cavity for forming a tubular case; pressurizing and cold forging the blank material, which causes the blank material to fill the entire mold cavity to form the tubular case with a tube head, a flange, and a tube body from top to bottom, with a space being arranged inside the tube head and the tube body; and ultimately, punching a hole inside the tubular case to form a through hole penetrating through the space inside the tube head and the tube body.

What is claimed is: 
     
         1 . A method of manufacturing a tubular case with a flange, comprising the steps of: 
 placing a blank material into the mold cavity for forming a tubular case;   pressurizing and cold forging the blank material, which causes the blank material to fill the entire mold cavity to form the tubular case with a tube head, a flange, and a tube body from top to bottom, with a space being arranged inside the tube head and the tube body; and   punching a hole inside the tubular case to form a through hole penetrating through the space inside the tube head and the tube body.   
     
     
         2 . The method of manufacturing a tubular case with a flange of  claim 1 , wherein a placing opening is arranged above the mold cavity, a tube body groove is arranged to extend downward from the bottom of the placing opening, a movable protrusion is arranged above the placing opening, and a tube head groove is arranged on the end surface of the protrusion, which cause the blank material to first fill the placing opening, and then to further fill the tube head groove upward and the tube body groove downward respectively, thus accomplishing the appearance of the tubular case. 
     
     
         3 . The method of manufacturing a tubular case with a flange of  claim 2 , wherein the blank material is formed to be in pie-shape, and the periphery of the blank material is near the edge of the placing opening, with the blank material when being pressurized filling the placing opening rapidly. 
     
     
         4 . The method of manufacturing a tubular case with a flange of  claim 1 , wherein the blank material fills the placing opening to form the tubular case by one-step pressurizing. 
     
     
         5 . A tubular case with a flange, comprising a tube head which is connected backward to a tube body, with a flange extending outward being arranged at the connection between the tube head and the tube body, and a penetrated through hole being arranged inside the tube head and the tube body. 
     
     
         6 . The tubular case with a flange of  claim 5 , wherein the tube head, the tube body and the flange are made of the same blank material. 
     
     
         7 . The tubular case with a flange of  claim 6 , wherein the tube head, the tube body and the flange are formed by one-step pressurizing and cold forging.