Method and device for bending blade member

Abstract

This invention aims at a bending process in the width direction on a blade member ( 1 ) without leaving any unprocessed portion. According to the present invention, the thickness-deviating process of making the front end edges ( 41, 51 ) of dies ( 4, 5 ) into a portion near the blade point ( 12 ) and flowing material of the blade member ( 1 ) is carried out. The thickness-deviating process is carried out at plural positions in the length direction on both sides of the blade member ( 1 ). By making the linear shapes of the front end edges ( 41, 51 ) meet each other in the width direction of the blade member ( 1 ), the thickness-deviating process is carried out.

1 . A method for bending a blade member ( 1 ) in the width direction by deforming the blade member ( 1 ) having a blade point ( 12 ) at an end edge in the width direction into warp in the width direction, wherein 
 thickness-deviating process of pressing and flowing material of the blade member ( 1 ) to at least one side of a portion which front end edges ( 41 ,  51 ) bite into through an operation of making said front end edges ( 41 ,  51 ) narrowed linearly as they go to the front ends, and equipped on dies ( 4 ,  5 ), invade and bite into a portion near a blade point ( 12 ) of the blade member ( 1 ) is carried out at plural positions in the length direction on both faces of said blade member ( 1 ) so as to deform the blade member ( 1 ) at the thickness-deviating process portions into warp in the width direction.    
   
   
       2 . The method for bending a blade member according to  claim 1  wherein said thickness-deviating process is carried out with the linear shape of said front end edges ( 41 ,  51 ) meeting the width direction of said blade member ( 1 ).  
   
   
       3 . The method for bending a blade member according to  claim 1  wherein in said thickness-deviating process, the biting amount of the front end edges ( 41 ,  51 ) of the dies ( 4 ,  5 ) to the blade member ( 1 ) is increased gradually at a portion nearer the blade point ( 12 ) of the blade member ( 1 ).  
   
   
       4 . The method for bending a blade member according to  claim 1  wherein after a specified portion in the length direction of the belt-like blade member ( 1 ) having a blade point ( 12 ) at an end edge in the width direction is bent to a desired shape, said thickness-deviating process is carried out to the blade member ( 1 ).  
   
   
       5 . The method for bending a blade member according to  claim 1  wherein said thickness-deviating processed portion is moved successively in one direction of the length direction of the blade member ( 1 ).  
   
   
       6 . The method for bending a blade member according to  claim 1  wherein said dies ( 4 ,  5 ) are disposed on both sides across the blade member ( 1 ) such that they are capable of moving relative to each other in the direction of approaching/breaking away and by approaching the dies ( 4 ,  5 ) relative to each other, said thickness-deviating process is carried out to both sides of the blade member ( 1 ) at the same time.  
   
   
       7 . The method for bending a blade member according to  claim 1  wherein a target for this method is such a blade member ( 1 ), in which slit-like cutouts ( 11 ) long in the width direction are provided at plural positions at an interval in the length direction and the dimension between a cutout end ( 13 ) at a cutout forming position and the end edge in the width direction of the blade member ( 1 ) is shorter than the width at a portion in which the cutout ( 11 ) is not formed.  
   
   
       8 . A device for bending a blade member in the width direction of a blade member ( 1 ) by deforming the blade member ( 1 ) having a blade point ( 12 ) at an end edge in the width direction to warp in the width direction, comprising: 
 a pair of dies ( 4 ,  5 ) disposed on both sides across a belt-like blade member ( 1 ) such that they are capable of moving relative to each other in the direction of approaching/breaking away; and    front end edges ( 41 ,  51 ) narrowed linearly as they go to the front ends, disposed on these dies ( 4 ,  5 ) and meeting each other in the width direction of the blade member ( 1 ).    
   
   
       9 . The device for bending a blade member according to  claim 8  wherein the thickness-deviating process of pressing and flowing material of the blade member ( 1 ) to at least one side of a portion which said front end edges ( 41 ,  51 ) bite into through a biting operation of making said front end edges ( 41 ,  51 ) invade and bite into a portion near the blade point ( 12 ) of the blade member ( 1 ) by moving the pair of said dies ( 4 ,  5 ) such that they approach each other, is carried out.  
   
   
       10 . The device for bending a blade member according to  claim 8  wherein said front end edges ( 41 ,  51 ) are so inclined that the biting amount of the front end edges ( 41 ,  51 ) to the blade member ( 1 ) in said thickness-deviating process increases more gradually at a portion nearer the blade point ( 12 ) of the blade member ( 1 ).