Wire drawing machine and wire drawing method

Abstract

A non-slip wire drawing machine with a reduced number of dancers is provided. The wire drawing machine comprises: a first wire drawing die for reducing a diameter of a metal wire passing therethrough, thereby drawing the metal wire; a back tension control unit that controls a first back tension of the metal wire passing through the first wire drawing die; a first capstan that pulls the metal wire passing through the first wire drawing die at a first front tension through the first wire drawing die in a non-slip manner; a first front tension measuring unit that measures the first front tension; a first capstan control unit that controls a rotation torque of the first capstan based on the measured first front tension; and a winding unit that winds up the drawn metal wire.

What is claimed is: 
     
         1 . A wire drawing machine comprising:
 a first wire drawing die for reducing a diameter of a metal wire passing therethrough, thereby drawing the metal wire;   a back tension control unit that controls a first back tension of the metal wire passing through the first wire drawing die;   a first capstan that pulls the metal wire passing through the first wire drawing die at a first front tension through the first wire drawing die in a non-slip manner;   a first front tension measuring unit that measures the first front tension;   a first capstan control unit that controls a rotation torque of the first capstan based on the measured first front tension; and   a winding unit that winds up the drawn metal wire.   
     
     
         2 . The wire drawing machine of  claim 1 , further comprising a second wire drawing die which is provided between the first capstan and the winding unit and through which the metal wire pulled out by the first capstan passes, so as to reduce the diameter of the metal wire passing therethrough, thereby drawing the metal wire,
 wherein the first capstan delivers the metal wire to the second wire drawing die in a non-slip manner, and   wherein the first capstan control unit controls the rotation torque of the first capstan based on the first front tension so that the metal wire passing through the second wire drawing die has a second back tension of a predetermined value.   
     
     
         3 . The wire drawing machine of  claim 2 , further comprising:
 a second capstan that pulls the metal wire passing through the second wire drawing die at a second front tension through the second wire drawing die in a non-slip manner;   a third wire drawing die which is provided between the second capstan and the winding unit and through which the metal wire pulled out by the second capstan passes, so as to reduce the diameter of the metal wire passing therethrough, thereby drawing the metal wire;   a second front tension measuring unit that measures the second front tension; and   a second capstan control unit that controls a rotation torque of the second capstan based on the measured second front tension,   wherein the second capstan control unit controls the rotation torque of the second capstan based on the second front tension so that the metal wire passing through the third wire drawing die has a third back tension of a predetermined value.   
     
     
         4 . The wire drawing machine of  claim 1 , further comprising an unwinding unit that delivers the metal wire to the first wire drawing die,
 wherein the back tension control unit is a dancer that controls the first back tension of the metal wire between the unwinding unit and the first wire drawing die.   
     
     
         5 . A wire drawing machine comprising:
 a first wire drawing die for reducing a diameter of a metal wire passing therethrough, thereby drawing the metal wire;   a back tension control unit that controls a first back tension of the metal wire passing through the first wire drawing die;   a first capstan that pulls the metal wire passing through the first wire drawing die in a non-slip manner through the first wire drawing die;   a first capstan control unit that controls a rotation torque of the first capstan so as to pull the metal wire through the first wire drawing die; and   a winding unit that winds up the drawn metal wire,   wherein the first capstan control unit stores, in advance, a first front tension of the metal wire obtained when pulling the metal wire through the first wire drawing die by rotating the first capstan at a controlled speed, and   wherein the first capstan control unit controls the rotation torque of the first capstan based on the first front tension so as to pull the metal wire through the first wire drawing die.   
     
     
         6 . The wire drawing machine of  claim 5 , wherein the first capstan control unit stores, as the first front tension, an average torque of the first capstan obtained when pulling the metal wire through the first wire drawing die by rotating the first capstan at a controlled speed for a predetermined period of time. 
     
     
         7 . The wire drawing machine of  claim 5 , further comprising:
 a second wire drawing die which is provided between the first capstan and the winding unit and through which the metal wire pulled out by the first capstan passes, so as to reduce the diameter of the metal wire passing therethrough, thereby drawing the metal wire; and   a back tension measuring unit that measures a second back tension of the metal wire passing through the second wire drawing die,   wherein the first capstan delivers the metal wire to the second wire drawing die in a non-slip manner, and   wherein the first capstan control unit controls the rotation torque of the first capstan so that the measured second back tension becomes a predetermined value.   
     
     
         8 . A wire drawing method for drawing a metal wire by causing the metal wire to pass through a wire drawing die so as to reduce a diameter of the metal wire, the method comprising the steps of:
 controlling a back tension of the metal wire passing through the wire drawing die;   pulling the metal wire passing through the wire drawing die at a predetermined front tension through the wire drawing die in a non-slip manner using a capstan;   measuring the front tension; and   controlling a rotation torque of the capstan based on the measured front tension.   
     
     
         9 . A wire drawing method for drawing a metal wire by causing the metal wire to pass through a wire drawing die so as to reduce a diameter of the metal wire, the method comprising:
 a step of controlling a back tension of the metal wire passing through the wire drawing die;   a step of pulling the metal wire passing through the wire drawing die in a non-slip manner through the wire drawing die using a capstan; and   a controlling step of controlling a rotation torque of the capstan,   wherein the controlling step comprises the steps of:   storing, in advance, a front tension of the metal wire obtained when pulling the metal wire through the wire drawing die by rotating the capstan at a controlled speed; and   controlling the rotation torque of the capstan based on the front tension so as to pull the metal wire through the wire drawing die.