| 摘要 |
The present invention relates to a fastening member having a variable volume, and to a method for molding same. Specifically, a molding member (100) having a molding groove (110) is provided, and melted steel fills the molding groove (110) of the molding member (100) so as to cast a fastening member (200) having the shape of a nut. The method for molding the fastening member consists of: a step (S10) of forming a recess part (111) in an upper end of an inner surface of the molding groove (110) of the molding member (100), and then forming a protrusion (221) on an outer surface when the fastening member (200) is formed so as to manufacture the molding member (100) having the circular molding groove (110) and the recess part (111) in the inner surface of the molding groove (110); a step (S20) of filling melted steel into the molding groove (110) of the molding member (100) so as to cast the fastening member (200) having the protrusion (221); and a step (S30) of forming an insertion groove (22) in a top surface of a flange part (220) of the fastening member (200) molded through the step (S20) of molding the fastening member so as to insert a magnetic body (223) into the insertion groove (222). Since the fastening member has a variable volume, when the groove is formed in the fastening member, it may prevent the outer appearance of the fastening member from being deformed so as to improve product quality. Further, the fastening member may be moldable so as to improve workability when the fastening member is applied. |
