Hot press apparatus, method for manufacturing hot press-formed product, and hot press-formed product

Abstract

Provided is a hot press apparatus ( 1000 ) including a punch ( 1200 ), a die ( 1300 ), and a die pad ( 1100 ), in which a groove portion ( 1220 ) is provided in a top surface ( 1210 ) of the punch ( 1200 ), in which, in a cross section in a press direction (P), an angle between a wall surface of the groove portion ( 1220 ) and the press direction (P) is 2° to 8°, in which a refrigerant flow path is provided inside the punch ( 1200 ), in which the die ( 1300 ) and the die pad ( 1100 ) are disposed to face the punch ( 1200 ) in the press direction (P), the die pad ( 1100 ) is disposed facing the top surface ( 1210 ) of the punch ( 1200 ), and a protrusion ( 1120 ) is provided at a position on the die pad ( 1100 ) opposing the groove portion ( 1220 ) in the press direction (P), and the protrusion ( 1120 ) has an inverted shape of the groove portion ( 1220 ).

1 . A hot press apparatus comprising a punch, a die, and a die pad,
 wherein a groove portion is provided in a top surface of the punch,   wherein, in a cross section in a press direction, an angle between a wall surface of the groove portion and the press direction is 2° to 8°,   wherein a refrigerant flow path is provided inside the punch,   wherein the die and the die pad are disposed to face the punch in the press direction,   the die pad is disposed facing the top surface of the punch, and   a protrusion is provided at a position on the die pad opposing the groove portion in the press direction, and the protrusion has an inverted shape of the groove portion.   
     
     
         2 . The hot press apparatus according to  claim 1 ,
 wherein the die has a step portion that comes into contact with the die pad in the press direction, and   wherein the die pad comes into contact with the die in the press direction at a bottom dead point of a forming process.   
     
     
         3 . The hot press apparatus according to  claim 1 , wherein, in the cross section, an angle between a straight line connecting an R end of a side surface portion side ridge portion of the wall surface and an R end of a bottom surface portion side ridge portion of the groove portion and the press direction is 2° to 8°. 
     
     
         4 . A method for manufacturing a hot press-formed product using the hot press apparatus according to  claim 1 , the method comprising:
 arranging a blank between the die and the punch;   causing the blank to be sandwiched between the punch and the die pad; and   bringing the punch and the die close to each other in the press direction until the bottom dead point of the forming process.   
     
     
         5 . A hot press-formed product that includes a first sheet portion having a recessed portion formed therein and a second sheet portion inclined with respect to the first sheet portion,
 wherein, in a cross-sectional view in a plane in which a cross-sectional line length of the recessed portion is the smallest among planes passing through a point at which a depth of the recessed portion is the largest, an angle between a side portion of the recessed portion and a direction perpendicular to a sheet surface of the first sheet portion is 2° to 8°, and   wherein a sheet thickness at a portion of the recessed portion at which the sheet thickness is smallest is 60% or more of a sheet thickness at a portion of the first sheet portion excluding the recessed portion.   
     
     
         6 . The hot press-formed product according to  claim 5 , wherein, in the cross-sectional view, an angle between a straight line connecting an R end of a side portion side ridge portion of the side portion and an R end of a bottom portion side ridge portion of the recessed portion and a direction perpendicular to the sheet surface of the first sheet portion is 2° to 8°. 
     
     
         7 . A method for manufacturing a hot press-formed product using the hot press apparatus according to  claim 2 , the method comprising:
 arranging a blank between the die and the punch;   causing the blank to be sandwiched between the punch and the die pad; and   bringing the punch and the die close to each other in the press direction until the bottom dead point of the forming process.   
     
     
         8 . A method for manufacturing a hot press-formed product using the hot press apparatus according to  claim 3 , the method comprising:
 arranging a blank between the die and the punch;   causing the blank to be sandwiched between the punch and the die pad; and   bringing the punch and the die close to each other in the press direction until the bottom dead point of the forming process.