Hot press forming device for coated steel and hot press forming method using same

Abstract

The present invention relates to a hot press forming device for coated steel and a hot press forming method using the same, which can reduce the generation of fine cracks of a molding and can obtain uniform material properties.

1 . A hot press forming (HPF) device for forming coated steel, the HPF device comprising an upper die and a lower die,
 wherein the upper and lower dies constrain a portion of a blank, and the HPF device further comprises a cam configured to form another portion of the blank not constrained by the upper and lower dies in order to form a shaped portion.   
     
     
         2 . The HPF device of  claim 1 , wherein the cam is moved in a direction different from directions in which the upper and lower dies are moved. 
     
     
         3 . The HPF device of  claim 1 , wherein the cam is disposed between the upper and lower dies. 
     
     
         4 . The HPF device of  claim 1 , wherein the cam is separate from a portion of the upper die or the lower die. 
     
     
         5 . An HPF method for forming coated steel, the HPF method comprising:
 heating a blank;   forming the heated blank using an HPF device; and   cooling the formed blank,   wherein in the forming of the heated blank, a portion of the heated blank is constrained by upper and lower dies of the HPF device, and another portion of the heated blank not constrained by the upper and lower dies is formed by a cam in order to form a shaped portion.   
     
     
         6 . The HPF method of  claim 5 , wherein in the forming of the heated blank, the cam is moved in a direction different from directions in which the upper and lower dies are moved. 
     
     
         7 . The HPF method of  claim 5 , wherein the cam is disposed between the upper and lower dies. 
     
     
         8 . The HPF method of  claim 5 , wherein the cam is separate from a portion of the upper die or the lower die. 
     
     
         9 . The HPF method of  claim 5 , wherein in the heating of the blank, the blank is entirely heated to a temperature equal to or higher than an A3 temperature of the blank, or the blank is heated to a temperature equal to or higher than the A3 temperature of the blank in a predetermined region and to a temperature equal to or lower than an A1 temperature of the blank in another region.