Edgewise bending processing method for rectangular wire and bending processing apparatus

Abstract

An edgewise bending processing method and apparatus comprise a restraining mechanism for restraining a rectangular-section wire having a rectangular cross-section with long sides and short sides in such a way as to press a surface of the wire including the long side and hold the wire in contact with a surface of the wire including the short side; and an external guide and a rotating mechanism for edgewise bending the rectangular-section wire. The restraining mechanism restrains part of the wire in a restraining dimension that is shorter than a length of the short side and in a range of elastic deformation of the wire, and the external guide and the rotating mechanism bend the wire edgewise at the short side of the wire that is in contact with the restraining mechanism.

1 . An edgewise bending processing method for a rectangular-section wire comprising the steps of:
 restraining the rectangular-section wire having a rectangular cross-section with long sides and short sides with a restraining device in such a way as to press a surface of the wire including the long side and hold the wire in contact with a surface of the wire including the short side; and   edgewise bending the rectangular-section wire with a bending device;   wherein the restraining device restrains part of the wire in a restraining dimension that is shorter than a length of the short side of the wire and in a range of elastic deformation of the wire, and   the bending device bends the wire edgewise at the short side of the wire that is in contact with the restraining device.   
   
   
       2 . The edgewise bending processing method for the rectangular-section wire according to  claim 1 , wherein
 the rectangular-section wire is coated with a coating material.   
   
   
       3 . The edgewise bending processing method for the rectangular-section wire according to  claim 1 , wherein
 the restraining device includes a flange whereby the surface of the rectangular-section wire including the long side is pressed, a base facing the flange, a shaft inserted through the base, and a spacer having thickness corresponding to the restraining dimension, and   the spacer is formed with a chamfer at a corner facing a joint part joining the shaft and the flange.   
   
   
       4 . The edgewise bending processing method for the rectangular-section wire according to  claim 1 , the method comprising:
 a first step of feeding the rectangular-section wire with a feeding device;   a second step of holding the wire in place with a clamp and restraining the wire with the restraining device;   a third step of edgewise bending the wire with the bending device while the wire is held by the clamp; and   a fourth step of releasing the rectangular-section wire from the clamp and the restraining device;   the first to fourth steps being repeatedly performed.   
   
   
       5 . An edgewise bending processing apparatus for rectangular-section wire, the apparatus comprising:
 a restraining device to restrain the rectangular-section wire having a rectangular cross-section with long sides and short sides in such a way as to press a surface of the wire including the long side and hold the wire in contact with a surface of the wire including the short side; and   a bending device to edgewise bend the rectangular-section wire;   wherein the restraining device restrains part of the wire in a restraining dimension that is shorter than a length of the short side of the wire and in a range of elastic deformation of the wire, and   the bending device bends the wire edgewise at the short side of the wire that is in contact with the restraining device.   
   
   
       6 . The edgewise bending processing apparatus for rectangular-section wire according to  claim 5 , wherein
 the restraining device includes a flange whereby the surface of the rectangular-section wire including the long side is pressed, a base facing the flange, a shaft inserted through the base, and a spacer having thickness corresponding to the restraining dimension, and   the spacer is formed with a chamfer at a corner facing a joint part joining the shaft and the flange.   
   
   
       7 . The edgewise bending processing method for the rectangular-section wire according to  claim 2 , wherein
 the restraining device includes a flange whereby the surface of the rectangular-section wire including the long side is pressed, a base facing the flange, a shaft inserted through the base, and a spacer having thickness corresponding to the restraining dimension, and   the spacer is formed with a chamfer at a corner facing a joint part joining the shaft and the flange.   
   
   
       8 . The edgewise bending processing method for the rectangular-section wire according to  claim 2 , the method comprising:
 a first step of feeding the rectangular-section wire with a feeding device;   a second step of holding the wire in place with a clamp and restraining the wire with the restraining device;   a third step of edgewise bending the wire with the bending device while the wire is held by the clamp; and   a fourth step of releasing the rectangular-section wire from the clamp and the restraining device;   the first to fourth steps being repeatedly performed.   
   
   
       9 . The edgewise bending processing method for the rectangular-section wire according to  claim 3 , the method comprising:
 a first step of feeding the rectangular-section wire with a feeding device;   a second step of holding the wire in place with a clamp and restraining the wire with the restraining device;   a third step of edgewise bending the wire with the bending device while the wire is held by the clamp; and   a fourth step of releasing the rectangular-section wire from the clamp and the restraining device;   the first to fourth steps being repeatedly performed.   
   
   
       10 . The edgewise bending processing method for the rectangular-section wire according to  claim 7 , the method comprising:
 a first step of feeding the rectangular-section wire with a feeding device;   a second step of holding the wire in place with a clamp and restraining the wire with the restraining device;   a third step of edgewise bending the wire with the bending device while the wire is held by the clamp; and   a fourth step of releasing the rectangular-section wire from the clamp and the restraining device;   the first to fourth steps being repeatedly performed.