Manufacturing apparatus of stiffener for center-pillar

Abstract

Disclosed herein is a manufacturing apparatus of a center pillar stiffener having a closed section, including: a fixing shape plate; a concave cavity formed on a bottom surface of the fixing shape plate on which a blank is seated; a movable shape plate configured to slide on the fixing shape plate; a convex shaped core formed on the movable shape plate and configured to press and bend the blank toward the cavity; a mandrel inserted into the cavity to fix the bent blank; and a plurality of shape plates configured to slide over the blank and bend both ends of the blank protruding from the fixing shape plate to form a closed section.

What is claimed is: 
     
         1 . A manufacturing apparatus of a center pillar stiffener, having a closed section, comprising:
 a fixing shape plate;   a concave cavity formed on a bottom surface of the fixing shape plate on which a blank is seated;   a movable shape plate configured to slide onto the fixing shape plate;   a convex shaped core formed on the movable shape plate and configured to press and bend the blank toward the cavity;   a mandrel inserted into the cavity to fix the bent blank; and   a plurality of shape plates configured to slide over the blank and bend both ends of the blank protruding from the fixing shape plate to form a closed section.   
     
     
         2 . The manufacturing apparatus of  claim 1 , wherein the mandrel comprises at least two or more segments including a ball one side of each segment and a fastening groove on the other side of each segment, wherein the ball is fitted into the fastening groove of the adjacent segment to form a ball joint movement between the ball and the fastening groove. 
     
     
         3 . The manufacturing apparatus of  claim 2 , wherein the segments have different outer diameters according to a shape of the cavity. 
     
     
         4 . The manufacturing apparatus of  claim 3 , wherein the edge of each segment is rounded to form a curved surface. 
     
     
         5 . The manufacturing apparatus of  claim 1 , wherein the mandrel comprises: a first mandrel entering the cavity from a one side and a second mandrel entering the cavity from an opposite direction to the first mandrel.