Seat back frame and method of manufacturing the same

Abstract

A seat back frame of a vehicle using a magnesium alloy results in a seat back frame having the properties of a conventional steel press seat back frame. The seat back frame is reinforced regarding its strength and tapers from wider at the lower portion to thinner toward a head rest. The advantageous properties of the alloy seat, such as weight and castability, are much improved over the conventional. The method of molding such a seat back frame include molding the alloy into a mold via even disbursement about a casting gate.

1 . A seat back frame of a vehicle manufactured using a magnesium alloy, comprising: 
 a reinforcing frame with a U-shaped cross-section being formed as an integral body spanning over a front side as well as a right and a left side of a frame housing, which is known vulnerable to concentrated stress; and    wherein the front side of the frame is provided with a belt-shaped reinforcing element as an integral body.    
   
   
       2 . The seat back frame of a vehicle manufactured using a magnesium alloy according to  claim 1 , wherein said reinforcing element has a structure wherein the recliner region is the thickest as well as the widest at a lowest portion and becomes thinner as well as narrower toward the headrest region.  
   
   
       3 . The seat back frame of a vehicle manufactured using a magnesium alloy according to  claim 1 , further comprising guide brackets that guide the installation of headrest to said frame housing which has a separable bracket structure which is fixed to an assembly hole of said frame housing by means of an assembly means.  
   
   
       4 . The seat back frame of a vehicle manufactured using a magnesium alloy according to  claim 3 , wherein the assembly hole protrudes forward at regular intervals so that a nut cannot be protruded over the rear surface of said frame housing.  
   
   
       5 . A method of manufacturing a seat back frame of a vehicle manufactured using a magnesium alloy, comprising: 
 molding, via die casting, molten metal into a casting gate installed in the center of a mold such that the molten metal is dispersed in various directions and flowed into said mold;    wherein said molten metal is flowed into said mold at a rate of not less than about 4.5 m/sec and not more than about 5.5 m/sec under a virtual pressure of not less than about 500 bar and not more than about 700 bar and wherein a distance travelled by a piston to reach the above flow rate is set to be not less than about 150 mm and not more than about 250 mm.    
   
   
       6 . A method of manufacturing a seat back frame from an alloy, comprising: 
 molding metal into a casting gate installed at substantially a center of a seat frame mold such that the metal disperses in various directions into said mold;    wherein said metal is flows into said mold at a rate of not less than about 4.5 m/sec and not more than about 5.5 m/sec under a virtual pressure of not less than about 500 bar and not more than about 700 bar.