Method for shaping wire material and wire material shaping device

Abstract

A method for shaping a wire material that moves from the upstream side to the downstream side includes a first step of feeding the wire material while pressing the wire material by a first roller group including a plurality of rollers driven by a motor and a second step of feeding the wire material while pressing the wire material by a second roller group including a plurality of rotatably supported rollers. The first step is provided upstream side of the second step, and a push-in amount that is the difference between the outer dimension of the wire material and the gap between rollers through which the wire material passes is larger in the first step than in the second step.

1 . A method for shaping a wire material that moves from an upstream side to a downstream side, the method comprising:
 a first step of feeding the wire material while pressing the wire material by a first roller group including a plurality of rollers driven by a motor; and   a second step of feeding the wire material while pressing the wire material by a second roller group including a plurality of rotatably supported rollers, wherein   the first step is provided upstream of the second step, and   a push-in amount that is a difference between an outer dimension of the wire material and a gap between rollers through which the wire material passes is larger in the first step than in the second step.   
     
     
         2 . The method for shaping a wire material according to  claim 1 , wherein in the first step, the push-in amount sequentially decreases from the upstream side to the downstream side. 
     
     
         3 . The method for shaping a wire material according to  claim 1 , wherein in the second step, the push-in amount sequentially decreases to zero from the upstream side to the downstream side. 
     
     
         4 . The method for shaping a wire material according to  claim 1 , wherein a minimum push-in amount in the first step is at least 10 times as large as a maximum push-in amount in the second step. 
     
     
         5 . The method for shaping a wire material according to  claim 1 , further comprising a third step of feeding the wire material by a third roller group including a plurality of rotatably supported rollers, wherein
 the third step is provided downstream of the second step, and   the push-in amount in the third step is zero.   
     
     
         6 . The method for shaping a wire material according to  claim 1 , wherein a surface of each roller constituting the first roller group is urethane rubber. 
     
     
         7 . A wire material shaping device comprising:
 a feeding unit that feeds a wire material;   a first roller group including a plurality of rollers driven by a motor to press the wire material fed by the feeding unit; and   a second roller group that includes a plurality of rollers configured to further press the wire material pressed by the first roller group and is rotatably supported, wherein a push-in amount that is a difference between an outer dimension of the wire material and a gap between rollers through which the wire material passes is larger in the first roller group than in the second roller group.   
     
     
         8 . The wire material shaping device according to  claim 7 , wherein
 the first roller group is placed between the feeding unit and the second roller group, and   the push-in amount in the first roller group sequentially decreases from the feeding unit to the second roller group.   
     
     
         9 . The wire material shaping device according to  claim 7 , wherein the push-in amount in the second roller group sequentially decreases to zero from the first roller group to an opposite side. 
     
     
         10 . The wire material shaping device according to  claim 7 , wherein a minimum push-in amount in the first roller group is at least 10 times a maximum push-in amount in the second roller group. 
     
     
         11 . The wire material shaping device according to  claim 7 , further comprising a third roller group rotatably supported and including a plurality of rollers that further press the wire material pressed by the second roller group, wherein the push-in amount in the third roller group is zero. 
     
     
         12 . The wire material shaping device according to  claim 7 , wherein a surface of each roller constituting the first roller group is urethane rubber.