Roll-bending process apparatus and roll-bending process method

Abstract

A roll-bending process apparatus ( 100 ) including a pushing roll ( 10 ) having a cylindrical side surface and two receiving rolls ( 11 and 12 ) each having a cylindrical side surface is provided. The roll-bending process apparatus ( 100 ) bends a work ( 20 ) by pushing the pushing roll ( 10 ) toward the receiving rolls ( 11 and 12 ). The roll-bending process apparatus ( 100 ) forms a taper-shaped bending-formed article by adjusting a pushing amount of the pushing roll ( 10 ) so that a first pushing amount on one end side ( 10 a ) of the pushing roll ( 10 ) is different from a second pushing amount on the other end side ( 10 b ) of the pushing roll ( 10 ).

What is claimed is: 
     
         1 . A roll-bending process apparatus comprising:
 a pushing roll having a cylindrical side surface; and   two receiving rolls each having a cylindrical side surface, wherein   the roll-bending process apparatus bends a work by pushing the pushing roll toward the receiving rolls, and   the roll-bending process apparatus forms a taper-shaped bending-formed article by adjusting a pushing amount of the pushing roll so that a first pushing amount on a side of one end of the pushing roll is different from a second pushing amount on a side of the other end of the pushing roll.   
     
     
         2 . The roll-bending process apparatus according to  claim 1 , wherein in the taper-shaped bending-formed article, when a part having a large curvature is disposed on the one end side of the pushing roll and a part having a small curvature is disposed on the other end side of the pushing roll, the first pushing amount is larger than the second pushing amount. 
     
     
         3 . The roll-bending process apparatus according to  claim 1 , wherein when bending-formed articles having different taper angels are formed, a combination of the first and second pushing amounts is changed. 
     
     
         4 . A roll-bending process method using a pushing roll having a cylindrical side surface and two receiving rolls each having a cylindrical side surface, the roll-bending process method being for bending a work by pushing the pushing roll toward the receiving rolls, the roll-bending process method comprising:
 forming a taper-shaped bending-formed article by adjusting a pushing amount of the pushing roll so that a first pushing amount on a side of one end of the pushing roll is different from a second pushing amount on a side of the other end of the pushing roll.   
     
     
         5 . The roll-bending process method according to  claim 4 , wherein in the taper-shaped bending-formed article, when a part having a large curvature is disposed on the one end side of the pushing roll and a part having a small curvature is disposed on the other end side of the pushing roll, the first pushing amount is larger than the second pushing amount. 
     
     
         6 . The roll-bending process method according to  claim 4 , wherein when bending-formed articles having different taper angels are formed, a combination of the first and second pushing amounts is changed. 
     
     
         7 . The roll-bending process method according to  claim 4 , wherein
 the work is a trapezoidal plate including an upper bottom that forms a part having a large curvature of the bending-formed article, and a lower bottom that forms a part having a small curvature of the bending-formed article, the lower bottom being longer than the upper bottom, and   the lower bottom is bent at a predetermined curvature by the pushing on the other end side of the pushing roll, and   the upper bottom is bent at a predetermined curvature larger than that of the lower bottom by the pushing on the one end side of the pushing roll.