Wire drawing machine and wire drawing method

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.

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.

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.