Press molding device and manufacturing method thereof

Abstract

A press molding device includes a first die for supporting the work piece and a second die arranged to face the first die. The first die includes a punch including a first molding surface for molding the work piece and a blank holder that is movably arranged along a side surface that extends from the first molding surface of the punch and includes the supporting surface for supporting the end portion of the work piece. The second die includes the die portion that includes the second molding surface that faces the first molding surface and is used for molding the work piece and the trimming portion configured integrally with the die portion. The trimming portion includes the blade portion for cutting the end portion of the work piece. The die portion includes a flow path for circulating a refrigerant to cool the work piece along the second molding surface.

What is claimed is: 
     
         1 . A press molding device that presses and molds a work piece that has been heated while cooling the work piece, the press molding device comprising:
 a first die for supporting the work piece; and   a second die arranged to face the first die, wherein   the first die includes:   a punch including a first molding surface for molding the work piece, and   a blank holder that is movably arranged along a side surface extending from the first molding surface of the punch and includes a supporting surface for supporting an end portion of the work piece;   the second die includes;   a die portion that includes a second molding surface that faces the first molding surface and is used to mold the work piece and a fixed surface that extends to an outside from a tip portion of the second molding surface and faces the supporting surface of the blank holder and   a trimming portion that is configured integrally with the die portion;   the trimming portion includes:   a blade portion for cutting the end portion of the work piece;   the die portion includes:   a flow path for circulating a refrigerant to cool the work piece along the second molding surface;   the trimming portion is configured integrally with the die portion by being fixed to the fixed surface; and   the trimming portion includes a clamping surface that faces the supporting surface and clamps the end portion of the work piece with the supporting surface and further includes a protrusion where the clamping surface protrudes toward the blank holder side than the blade portion.   
     
     
         2 . The press molding device according to  claim 1  wherein
 the second molding surface includes a step portion for folding the work piece and molding a flange portion; and 
 the blade portion is provided inside a tangential line that is in contact with a corner portion of the protrusion and the step portion. 
 
     
     
         3 . The press molding device according to  claim 1  wherein
 with the end portion of the work piece being clamped between the supporting surface of the blank holder and the clamping surface of the protrusion, the die portion and the trimming portion are moved toward the first die and the blank holder is moved along the side surface of the punch so that the work piece is pressed and molded with the first molding surface and the second molding surface and, before the die portion and the trimming portion reach a bottom dead point, the blade portion cuts the end portion of the work piece. 
 
     
     
         4 . The press molding device according to  claim 1 , wherein
 the fixed surface of the die portion continuously extends from a tip portion of the second molding surface to an outside.   
     
     
         5 . The press molding device according to  claim 1  wherein
 the trimming portion is removably fixed to the fixed surface of the die portion. 
 
     
     
         6 . A method for manufacturing a press-molded article by pressing and molding a work piece that has been heated while clamping the work piece between a first die and a second die and cooling the work piece, the method comprising:
 pressing and molding the work piece with the first molding surface and the second molding surface and before a die portion and a trimming portion reach a bottom dead point, cutting an end portion of the work piece with a blade portion by moving the die portion and the trimming portion toward the first die and moving a blank holder along a side surface of a punch with the end portion of the work piece being clamped between a supporting surface of the blank holder and a clamping surface of the trimming portion, wherein   the first die includes the punch that includes the first molding surface for molding the work piece and the blank holder that is movably arranged along the side surface that extends from the first molding surface of the punch and includes the supporting surface for supporting the end portion of the work piece;   the second die includes the die portion including the second molding surface that faces the first molding surface and is used for molding the work piece and a fixed surface that extends to an outside from a tip portion of the second molding surface and faces the supporting surface of the blank holder, and the trimming portion that is configured integrally with the die portion;   the trimming portion includes the blade portion for cutting the end portion of the work piece;   the die portion includes a flow path for circulating a refrigerant to cool the work piece along the second molding surface;   the trimming portion is configured integrally with the die portion by being fixed to a fixed surface; and   the trimming portion includes the clamping surface that faces the supporting surface and clamps the end portion of the work piece with the supporting surface and further includes a protrusion where the clamping surface protrudes toward the blank holder side than the blade portion.   
     
     
         7 . The method for manufacturing the press-molded article according to  claim 6  wherein
 the trimming portion is removably fixed to the fixed surface of the die portion.