Bending device

Abstract

The bending device is adapted to bending of a longitudinal workpiece. The device comprises a bending die that has an outer shape corresponding to the bending shape, a clamping die that clamps the workpiece with the bending die, and a rotation mechanism that rotates the bending die and the clamping die to a predetermined bending direction while the workpiece is being clamped between the bending die and the clamping die. The rotation mechanism is provided with a selection mechanism that allows switching between a first rotation mode in which the bending die and the clamping die are rotated in a body and a second rotation mode in which one of the bending die and the clamping die is rotated independently of the other die.

1 . A bending device that bends a longitudinal workpiece, comprising: 
 a bending die that has an outer shape corresponding to a bending shape;    a clamping die that clamps the workpiece with the bending die; and    a rotation mechanism that rotates the bending die and the clamping die to a predetermined bending direction while the workpiece is being clamped between the bending die and the clamping die, wherein    the rotation mechanism includes a selection mechanism that allows switching between a first rotation mode in which the bending die and the clamping die are rotated in a body and a second rotation mode in which one of the bending die and the clamping die is rotated independently of the other die.    
   
   
       2 . The bending device set forth in  claim 1 , wherein 
 the rotation mechanism sets a relative position between the bonding die and the clamping die either to a first relative position, which is an initial position when bending the workpiece to a right side, and to a second relative position, which is an initial position when bending the workpiece to a left side, by rotating at least one of the bending die and the clamping die by means of the selection mechanism.    
   
   
       3 . The bending device set forth in  claim 1 , wherein 
 the rotation mechanism comprises a rotational force applicator that transmits a rotational force to at least one of the bending die and the clamping die, and    the selection mechanism transmits the rotational force from the rotational force applicator to both the bending die and the clamping die in the first rotation mode, while the selection mechanism transmits the rotational force from the rotational force applicator to either of the bending die and the clamping die in the second rotation mode.    
   
   
       4 . The bending device set forth in  claim 3 , wherein 
 the selection mechanism transmits the rotational force from the rotational force applicator only to the bending die out of the bending die and the clamping die in the second rotation mode.    
   
   
       5 . The bending device set forth in  claim 1 , wherein 
 the bending die has a linear section in its outer shape, and    the clamping die clamps the workpiece with the linear section of the bending die.    
   
   
       6 . The bending device set forth in  claim 2 , wherein 
 the bending die is provided with 
 a first linear section in part of its outer shape facing the clamping die when the relative position between the bending die and the clamping die is in the first relative position, and  
 a second linear section in part of its outer shape facing the clamping die when the relative position between the bending die and the clamping die is in the second relative position, and  
   the clamping die clamps the workpiece with the first linear section of the bending die when the workpiece is being bent to the right side, while the clamping die clamps the workpiece with the second linear section of the bending die when the workpiece is being bent to the left side.    
   
   
       7 . The bending device set forth in  claim 1 , wherein 
 the clamping die includes 
 a clamping die for right bend that clamps the workpiece with the bending die when bending the workpiece to a right side, and  
 a clamping die for left bend that clamps the workpiece with the bending die when bending the workpiece to a left side.  
   
   
   
       8 . The bending device set forth in  claim 6 , wherein 
 the clamping die includes 
 a clamping die for right bend that clamps the workpiece with the first linear section of the bending die when bending the workpiece to the right side, and  
 a clamping die for left bend that clamps the workpiece with the second linear section of the bending die when bending the workpiece to the left side.  
   
   
   
       9 . The bending device set forth in  claim 7 , wherein 
 the clamping dies for right bend and left bend are arranged in such a manner that moving directions of the respective clamping dies when clamping the workpiece are nearly parallel to each other.    
   
   
       10 . The bending device set forth in  claim 1 , wherein 
 the bending die includes in its outer shape a plurality of bending die contact portions which correspond to a plurality of bending shapes of the workpiece,    the clamping die includes in its outer shape a plurality of clamping die contact portions which correspond to a plurality of bending shapes of the workpiece, and    when the workpiece is clamped between the bending die and the clamping die to be bent, the workpiece is clamped between one of the bending die contact portions and one of the clamping die contact portions respectively selected in accordance with the bending shape of the workpiece.    
   
   
       11 . The bending device set forth in  claim 7 , wherein 
 the bending die has in its outer shape a plurality of bending die contact portions which correspond to a plurality of bending shapes of the workpiece,    the clamping die for right bend has in its outer shape a plurality of clamping die contact portions for right bend which correspond to a plurality of bending shapes of the workpiece, and the clamping die for left bend has in its outer shape a plurality of clamping die contact portions for left bend which correspond to a plurality of bending shapes of the workpiece, and    when the workpiece is clamped between the bending die and the clamping die for right bend to be bent to a right side, the workpiece is clamped between one of the bending die contact portions and one of the clamping die contact portions for right bend respectively selected in accordance with the bending shape of the workpiece, and    when the workpiece is clamped between the bending die and the clamping die for left bend to be bent to a left side, the workpiece is clamped between one of the bending die contact portions and one of the clamping die contact portions for left bend respectively selected in accordance with the bending shape of the workpiece.    
   
   
       12 . The bending device set forth in  claim 7 , wherein 
 when bending the workpiece to the right side, the clamping die for right bend is moved toward the bending die so that the workpiece is clamped between the bending die and the clamping die for right bend,    when bending the workpiece to the left side, the clamping die for left bend is moved toward the bending die so that the workpiece is clamped between the bending die and the clamping die for left bend.    
   
   
       13 . The bending device set forth in  claim 1 , further comprising 
 a right pressure die that receives a bending reaction force generated when bending the workpiece to a right side, and    a left pressure die that receives a bending reaction force generated when bending the workpiece to a left side.    
   
   
       14 . The bending device set forth in  claim 13 , wherein 
 the right pressure die and the left pressure die are disposed on both sides of the bending die.    
   
   
       15 . The bending device set forth in  claim 10 , further comprising 
 a right pressure die that receives a bending reaction force generated when bending the workpiece to a right side, and    a left pressure die that receives a bending reaction force generated when bending the workpiece to a left side,    the right pressure die includes a plurality of right pressure die contact portions corresponding to the shape of the workpiece, and    the left pressure die includes a plurality of left pressure die contact portions corresponding to the shape of the workpiece, and    when the workpiece is clamped between one of the bending die contact portions and one of the clamping die contact portions respectively selected in accordance with the bending shape of the workpiece to the right side, one of the plurality of right pressure die contact portions is in contact with the workpiece to receive the bending reaction force, and    when the workpiece is clamped between one of the bending die contact portions and one of the clamping die contact portions respectively selected in accordance with the bending shape of the workpiece to the left side, one of the plurality of left pressure die contact portions is in contact with the workpiece to receive the bending reaction force.    
   
   
       16 . The bending device set forth in  claim 1 , further comprising 
 a chuck that grips the workpiece, and    a feed mechanism that moves the chuck in a longitudinal direction of the workpiece and two directions which are directions orthogonal to the longitudinal direction so as to feed the workpiece between the bending die and the clamping die to be clamped therebetween.