Manufacturing method of press-formed product

Abstract

In order to manufacture a press-formed product including a plate-shaped portion and a wall portion, a blank having a plate shape is clamped by and between a first clamping structure located on a first side in a thickness direction of the blank with respect to the blank and a second clamping structure located on a second side opposite the first side in the thickness direction with respect to the blank. The wall portion is formed in the blank by press-forming performed by moving a first die in a pressing direction that is parallel to the thickness direction and that allows the first die to relatively come closer to the blank. The plate-shaped portion with a recessed part is formed in the blank by press-forming performed by further moving the first die in the pressing direction.

What is claimed is: 
     
         1 . A manufacturing method of a press-formed product including: a plate-shaped portion with a recessed part recessed in a first thickness direction of the plate-shaped portion; and a wall portion extending from an edge of the plate-shaped portion in a direction intersecting with the plate-shaped portion, the manufacturing method comprising:
 clamping a blank having a plate shape by and between a first clamping structure and a second clamping structure, the first clamping structure being on a first side in a second thickness direction, which is a thickness direction of the blank, the second clamping structure being on a second side opposite the first side in the second thickness direction with respect to the blank;   forming the wall portion in the blank by performing press-forming on the blank clamped by and between the first clamping structure and the second clamping structure, the press-forming being performed by moving at least one of a first die located on the first side with respect to the blank or a clamping/clamped body, which is a collection including the first clamping structure, the second clamping structure, the blank, and a second die, in a pressing direction that is parallel to the second thickness direction and that allows the first die to relatively come closer to the blank, the second die being located on the second side with respect to the blank; and   forming the plate-shaped portion with the recessed part in the blank by performing press-forming on the blank that is in the process of having the wall portion formed therein, the press-forming being performed by further moving the at least one of the first die or the clamping/clamped body in the pressing direction so as to allow the first die and the second die to come closer to each other.   
     
     
         2 . The manufacturing method of a press-formed product according to  claim 1 ,
 wherein the forming the wall portion in the blank includes forming the wall portion by moving the first die in the pressing direction, and   wherein the forming the plate-shaped portion with the recessed part in the blank includes forming the plate-shaped portion by further moving the first die in the pressing direction so that the recessed part is formed in the blank by the first die and the second die coming closer to each other.   
     
     
         3 . The manufacturing method of a press-formed product according to  claim 1 ,
 wherein the plate-shaped portion includes a first recessed part as the recessed part and a second recessed part recessed more shallowly in the first thickness direction than the first recessed part, and   wherein the clamping the blank includes clamping the blank by and between the first clamping structure and the second clamping structure to thereby form the second recessed part in the blank.   
     
     
         4 . The manufacturing method of a press-formed product according to  claim 1 ,
 wherein the clamping the blank includes clamping the blank by and between the first clamping structure and the second clamping structure at at least two points apart from each other in a direction perpendicular to the second thickness direction,   wherein the at least two points include a first point and a second point, and   wherein the forming the plate-shaped portion includes forming the recessed part in the blank by moving at least one of the first die or the second die such that a part of the at least one of the first die or the second die passes through in between the first point and the second point.   
     
     
         5 . The manufacturing method of a press-formed product according to  claim 1 ,
 wherein the blank is formed of a high tensile strength steel sheet.