Manufacturing method of thickness-varied metal plate, manufacturing method of pressed part, and processing machine

Abstract

In a manufacturing method of a thickness-varied metal plate, first, a cut plate is manufactured by cutting a metal plate having a constant plate thickness into a predetermined shape. Next, the thickness-varied metal plate is manufactured by rolling the cut plate using a processing machine including a pair of work rolls. Here, a radius of one of the pair of work rolls is varied in a circumferential direction and an axial direction. Accordingly, the thickness-varied metal plate manufactured by rolling the cut plate using the processing machine has a plate thickness varied in two different directions orthogonal to a plate thickness direction.

What is claimed is: 
     
         1 . A manufacturing method of a thickness-varied metal plate, the manufacturing method comprising:
 manufacturing a cut plate by cutting a metal plate into a predetermined shape; and   manufacturing a thickness-varied metal plate of which a plate thickness is varied in two different directions orthogonal to a plate thickness direction by processing the cut plate through at least one of rolling and forging, using a processing machine including a first work roll and a second work roll of which a radius is varied in a circumferential direction and an axial direction of a rotational axis.   
     
     
         2 . The manufacturing method of a thickness-varied metal plate according to  claim 1 , wherein
 the processing machine includes a first backup roll that is disposed on an opposite side of the first work roll from the second work roll and comes in contact with the first work roll, and a second backup roll that is disposed on an opposite side of the second work roll from the first work roll and comes in contact with the second work roll, and   when the thickness-varied metal plate manufactures, the cut plate is processed by rotating the first work roll in forward and reverse directions within a range in which a region with a constant radius of the first work roll comes in contact with the first backup roll, and rotating the second work roll in forward and reverse directions within a range in which a region with a constant radius of the second work roll comes in contact with the second backup roll.   
     
     
         3 . A manufacturing method of a thickness-varied metal plate, the manufacturing method comprising:
 manufacturing a cut plate by cutting a metal plate into a predetermined shape; and   manufacturing a thickness-varied metal plate of which a plate thickness is varied in two different directions orthogonal to a plate thickness direction by sequentially processing the cut plate through at least one of rolling and forging, using a first processing machine including a first work roll and a second work roll of which a radius is varied in a circumferential direction or an axial direction of a rotational axis, and a second processing machine including a pair of work rolls that are different in shape from the first work roll and the second work roll of the first processing machine.   
     
     
         4 . The manufacturing method of a thickness-varied metal plate according to  claim 3 , wherein, when the thickness-varied metal plate manufactures, a direction in which the cut plate is fed into the first processing machine is changed to a direction that is different from a direction in which the cut plate is fed into the second processing machine. 
     
     
         5 . The manufacturing method of a thickness-varied metal plate according to  claim 3 , wherein
 the first processing machine includes a first backup roll that is disposed on an opposite side of the first work roll from the second work roll and comes in contact with the first work roll, and a second backup roll that is disposed on an opposite side of the second work roll from the first work roll and comes in contact with the second work roll, and   when the thickness-varied metal plate manufactures, the cut plate is processed by rotating the first work roll in forward and reverse directions within a range in which a region with a constant radius of the first work roll comes in contact with the first backup roll, and rotating the second work roll in forward and reverse directions within a range in which a region with a constant radius of the second work roll comes in contact with the second backup roll.   
     
     
         6 . A manufacturing method of a pressed part, the manufacturing method comprising:
 manufacturing a partially processed thickness-varied metal plate by the manufacturing method according to  claim 1 ; and   manufacturing a pressed part by performing cold-press bending on an unprocessed portion of the partially processed thickness-varied metal plate.   
     
     
         7 . A processing machine for manufacturing a thickness-varied metal plate, the processing machine comprising:
 a first work roll; and   a second work roll of which a radius is varied in a circumferential direction and an axial direction of a rotational axis.   
     
     
         8 . The processing machine according to  claim 7 , wherein the second work roll includes a second roll main body of which a radius is constant in the circumferential direction and the axial direction of the rotational axis, and a second cam that is detachably mounted at a part of an outer circumferential surface of the second roll main body. 
     
     
         9 . The processing machine according to  claim 7 , wherein a radius of the first work roll is varied in a circumferential direction and an axial direction of a rotational axis. 
     
     
         10 . The processing machine according to  claim 9 , wherein the first work roll includes a first roll main body of which a radius is constant in the circumferential direction and the axial direction of the rotational axis, and a first cam that is detachably mounted at a part of an outer circumferential surface of the first roll main body.