Press-molded product, press-molded product producing method, and press-molded product producing apparatus

Abstract

The objective is to provide a press-molded product including an inward continuous flange and capable of improving performance involved with the bonding strength between a reinforcing member and the other member or the rigidity of a vehicle body without forming a notch in a ridge-portion flange so as to prevent a defect generated during a press-molding process. Provided is a press-molded product of a metal plate which is formed by a steel plate having a tensile strength of 340 MPa or more and includes a ridge portion extending in a predetermined direction and first and second surface portions respectively extending from both ends of a ridge line formed by the ridge portion, the press-molded product including: an inward continuous flange which is obtained by continuously forming a ridge-portion flange formed inward in an end portion of the ridge portion, a first flange formed inward in at least a part of an area of an end portion of the first surface portion, and a second flange formed inward in at least a part of an area of an end portion of the second surface portion. Regarding a plate thickness of an edge portion of the ridge-portion flange, the ridge-portion flange has a plate thickness distribution in which a plate thickness of a portion of each of areas on both sides of a circumferential center area is equal to or larger than a plate thickness of the center area.

1 . A press-molded product producing method for a work which is formed by a steel plate having a tensile strength of 340 MPa or more and includes a ridge portion extending in a predetermined direction and first and second surface portions respectively extending from both ends of a ridge line formed by the ridge portion, a flange being formed in at least one end portion of the work in the predetermined direction, the press-molded product producing method comprising:
 an installation step of supporting an area excluding the end portion of the work from an inner area of the work; and   a bending step of, using a bending tool having a protrusion portion, bringing the protrusion portion into contact with a predetermined position of the ridge portion in the end portion of the work from an outer area of the work and then relatively moving the bending tool in a plate thickness direction of the predetermined position in a direction toward the inner area so as to form the flange.   
     
     
         2 . The press-molded product producing method according to  claim 1 ,
 wherein in the bending step, the flange is formed in a manner that the protrusion portion of the bending tool presses the predetermined position of the ridge portion in the end portion in accordance with the movement of the bending tool so as to bend the predetermined position in a plate thickness direction and then a portion other than the protrusion portion of the bending tool sequentially presses another portion excluding the predetermined position in the end portion so as to bend the other portion in a plate thickness direction.   
     
     
         3 . The press-molded product producing method according to  claim 1 ,
 wherein the predetermined position is an area substantially having a width of a plate thickness and including a circumferential center portion and both sides of the circumferential center portion of the ridge portion, and   wherein the protrusion portion presses the predetermined position in a plate thickness direction of the center portion.   
     
     
         4 . A press-molded product producing apparatus comprising:
 a work supporting tool which supports a work including a ridge portion extending in a predetermined direction and first and second surface portions respectively extending from both ends of a ridge line formed by the ridge portion from an inner area of the work; and   a bending tool which relatively moves in a direction toward the inner area of the work while contacting an end portion of the work in the predetermined direction so as to bend the end portion in a direction toward the inner area,   wherein the bending tool includes a protrusion portion which contacts a predetermined position in the end portion of the ridge portion and presses the predetermined position in a plate thickness direction of the predetermined position in accordance with the movement.   
     
     
         5 . The press-molded product producing apparatus according to  claim 4 ,
 wherein when the bending tool is viewed in the predetermined direction, a width of the protrusion portion decreases in a direction toward a front end portion and the front end portion forms a curve.   
     
     
         6 . The press-molded product producing apparatus according to  claim 4 ,
 wherein a height (h) of the protrusion portion and a curvature radius (rf) of a curvature of the ridge portion satisfy Equation (2) below:
   0.5× rf≤h≤ 3.0× rf   (2).