Stud and Method of Fabricating The Same

Abstract

The present invention relates to a stud and a method of fabricating the same, in which a female screw portion of the stud is formed in a cup shape by means of a reverse drawing process, thereby preventing damage of the female screw portion due to vibration and torque and solving a problem of quality degradation of various electronic products due to generation of burrs. The present invention comprises the steps of performing a deep drawing on a metal plate at a round shaped blank into a cup-shaped blank to thereby form a flange portion; performing a plurality of drawing processes again for reducing a diameter of the cup-shaped blank to thereby complete a body portion; performing a reverse drawing to form a female screw portion at the body portion; forming a press-fit fastening groove at a contact surface of the body portion and the flange portion by means of a slitting process, and performing a trimming process to fabricate the stud.

1 . A method of fabricating a stud, comprising the steps of:
 performing a deep drawing on a metal plate at a round shaped blank into a cup-shaped blank to thereby form a flange portion;   performing a plurality of drawing processes again for reducing a diameter of the cup-shaped blank to thereby complete a body portion;   performing a reverse drawing to form a female screw portion at the body portion; and   forming a press-fit fastening groove at a contact surface of the body portion and the flange portion by means of a slitting process, and performing a trimming process to fabricate the stud.   
   
   
       2 . A stud fabricated according to  claim 1 . 
   
   
       3 . A method of fabricating a stud, comprising the steps of:
 performing a deep drawing on a metal plate at a round shaped blank into a cup-shaped blank to thereby form a flange portion;   performing a plurality of drawing processes again for reducing a diameter of the cup-shaped blank to thereby complete a body portion;   performing a reverse drawing to form a female screw portion at the body portion;   performing a plurality of embossing processes to form a protrusion portion with acting as a guide when assembled with corresponding mating parts after forming the female screw portion and the flange portion; and   forming a press-fit fastening groove at a contact surface of the body portion and the flange portion by means of a slitting process, and performing a trimming process to fabricate the stud.   
   
   
       4 . A stud fabricated according to  claim 3 . 
   
   
       5 . A method of fabricating a stud, comprising the steps of:
 performing a deep drawing on a metal plate at a round shaped blank into a cup-shaped blank to thereby form a flange portion;   performing a plurality of drawing processes again for reducing a diameter of the cup-shaped blank to thereby complete a body portion;   performing a reverse drawing to form a female screw portion at the body portion;   forming a press-fit fastening groove at a contact surface of the body portion and the flange portion by means of a slitting process, and then performing a trimming process; and   performing a piercing process on a lower end portion of the female screw portion to fabricate the stud formed with a piercing portion.   
   
   
       6 . A stud fabricated according to  claim 5 .