KR20150059653A - Wire drawing machine and wire drwaing method - Google Patents

Abstract

The present invention provides a non slip type drawer with few steps.
A rear tension control unit for controlling a first rear tension of the metal wire passing through the first drawing die, a second tensioning unit for controlling a first tension of the metal wire passing through the first drawing die, A first front tension measuring unit for measuring a first front tension, a second front tension measuring unit for measuring a first front tension measured by the first front tension measuring unit based on the measured first front tension, A first capstan control section for controlling the rotation torque of one capstan; and a winder for winding up the fresh metal wire.

Description

WIRE DRAWING MACHINE AND WIRE DRWING METHOD [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drawing machine and a drawing method for drawing a metal wire. Particularly, the present invention relates to a drawing machine and a drawing method for drawing a metal wire into a non slip.

As a conventional drawing machine, there is a so-called slip-type drawing machine, for example, as disclosed in Japanese Patent Application Laid-Open No. 2003-53418 (Patent Document 1). In the conventional slip-type drawing machine, the rotating speed of the capstan is set to be faster than the linear speed of the metal wire, and the metal wire is pulled out from the drawing die by the capstan while slipping between the capstan and the metal wire to draw the metal wire.

Japanese Unexamined Patent Application Publication No. 2003-53418

However, in the conventional slip-type drawing machine, the slip ratio must be strictly controlled. In particular, when the metal wire having a small diameter is drawn, it is difficult to control the slip ratio.

According to a first aspect of the present invention, there is provided a semiconductor device comprising: a first drawing die for drawing a metal wire by reducing a diameter of a passing metal wire; A back tension control unit for controlling a first rear tension of the metal wire passing through the metal wire and a metal wire for passing the metal wire through the first metal wire to a non- A first front tension measuring unit for measuring the first front tension; a first capstan control unit for controlling a rotational torque of the first capstan based on the first front tension measured; And a winding section for winding up the metal wire that has been drawn.

The drawer may further include a first capstan disposed between the first capstan and the rewinding portion and adapted to allow the metal wire drawn by the first capstan to pass therethrough and to reduce the diameter of the metal wire, Wherein the first capstan sends out the metal wire as the non-slip to the second fresh die, and the first capstan control part controls the second wire of the metal wire passing through the second fresh dies, The rotational torque of the first capstan may be controlled based on the first front tension so that the tension is a predetermined value.

The drawing machine may further include a second capstan for drawing the metal wire passed through the second drawing die from the second drawing die to a non-slip at a second front tensile force, A third front die passing the metal wire pulled out by the second capstan and drawing the metal wire by reducing the diameter of the metal wire passed through; And a second capstan control unit for controlling the rotation torque of the second capstan based on the measured second front tension, wherein the second capstan control unit is operable to control the first capstan control unit And the rotational torque of the second capstan may be controlled based on the second front tension so that the third rear tension of the metal wire is a predetermined value.

Further, the drawing machine may further include an unwind portion for sending the metal wire to the first drawing die, wherein the rear tension controlling portion is provided between the winding portion and the first drawer so that the first rear tension (Step difference).

According to a second aspect of the present invention, there is provided a wire drawing apparatus comprising: a first wire drawing die for drawing the metal wire by reducing the diameter of a metal wire passing therethrough; A first capstan for pulling the metal wire passing through the first fresh die out of the first fresh die into a non slip state; A first capstan control section for controlling the rotation torque of the capstan and for drawing the metal wire from the first fresh dies, and a winding section for winding the metal wire that has been drawn, wherein the first capstan control section includes: Wherein the first front tension of the metal wire is stored in advance when the metal wire is pulled out from the first drawing die by rotating the first front tension Basis, to control the rotational torque of the first capstan provides sinseongi to the first pull-out from the fresh die the metallic wire.

The first capstan control unit may rotate the first capstan by a speed control for a predetermined period so that an average torque of the first capstan when the metal wire is pulled out from the first fresh dice, It may be stored as tension.

In addition, the drawer may be provided between the first capstan and the winding portion, and the metal wire drawn by the first capstan may pass through the wire, and the diameter of the metal wire may be reduced, And a second tension measuring unit for measuring a second rear tension of the metal wire passing through the second fresh dies, wherein the first capstan comprises: And the first capstan control unit may control the rotation torque of the first capstan so that the measured second back tension is a predetermined value.

According to a third aspect of the present invention, there is provided a drawing method of drawing a metal wire through passing a drawing die to reduce the diameter of the metal wire, the method comprising the steps of: controlling a backward tension of the metal wire passing through the drawing die; , Pulling the metal wire passing through the fresh die by a capstan to a non-slip from the fresh die at a predetermined front tension by using a capstan, measuring the front tension, measuring the front tension based on the measured front tension And controlling the rotation torque of the capstan.

According to a fourth aspect of the present invention, there is provided a drawing method of drawing a metal wire through passing a fresh die to reduce the diameter of the metal wire, the method comprising the steps of: controlling the backward tension of the metal wire passing through the fresh die; , Drawing the metal wire passing through the fresh dies into non-slip from the fresh dies using a capstan, and controlling the rotation torque of the capstan, Controlling the rotation torque of the capstan based on the front tension, and controlling the rotation speed of the metal wire by controlling the rotation speed of the metal wire to the first And drawing from a fresh die.

According to the drawing machine and drafting method described above, it is not necessary to form a step on the drawing unit, so that the construction can be simplified. In addition, it is possible to arbitrarily set the rear tension and the area reduction rate of the metal wire, and thus to provide a drawing machine capable of arbitrarily adjusting the drawing processing conditions. Therefore, according to the drawing machine and drafting method of the present embodiment, it is possible to reduce the consumption of the drawing die by arbitrarily setting the rear tension, and by setting the area decreasing rate arbitrarily, . According to the drawing machine and drafting method of the present embodiment, since the drawing conditions such as the drawing speed, the rear tension, and the front tension can be arbitrarily adjusted, the metal wire having various characteristics such as the diameter and the bent diameter of the wire, It is possible to produce a metal wire excellent in properties such as fracture load and tensile strength.

FIG. 1 is a schematic diagram showing a configuration of a drawing machine 100 according to an embodiment of the present invention.
2 is a block diagram showing a configuration of a control unit 200 for controlling the drafting machine 100. As shown in Fig.

Hereinafter, the present invention will be described with reference to the drawings. However, the following embodiments are not intended to limit the invention according to the claims, But is not limited to what is essential to the means.

(Construction of Drawing Machine 100)

FIG. 1 is a schematic diagram showing a configuration of a drawing machine 100 according to an embodiment of the present invention. 2 is a block diagram showing a configuration of the control unit 200 for controlling the drawing machine 100 according to the embodiment.

The drawing machine 100 includes a housing 12, an unwinding unit 20, drawing units 40 and 90, a winding unit 60, a control unit 200 for controlling each unit, . In the drawing machine 100, from the upstream side to the downstream side (from left to right in FIG. 1) along the path (hereinafter referred to as a "passing path") on which the metal wire 10 is fed, drawn, 20, the drawing units 40, 90 and the winding unit 60 are sequentially installed. The drawing machine 100 draws the metal wire sent out from the drawing unit 20 in order from the drawing units 40 and 90 in a successive manner and then drawing the drawn metal wire 10 into the winding unit 60 ).

The control unit (200) controls the operation of the drawer (100). The control unit 200 is configured with a system controller 110, an unwinding unit controller 120, a drawing unit controller 140 and a winding unit controller 160. The system controller 110 is connected to the winding unit controller 120, the drawing unit controller 140 and the winding unit controller 160, and controls each unit controller in a general manner.

The drawing unit controller 120, the drawing unit controller 140 and the winding unit controller 160 are connected to various arrangements provided in the drawing unit 20, the drawing units 40 and 90 and the winding unit 60, Control the unit. Although only one drawing unit controller 140 is shown in Fig. 2, the drawing unit controller 140 is installed for each of n (n is a positive integer) drawing units 40-1 to n, 90 .

The system controller 110 and the winding unit controller 120, the drawing unit controller 140 and the winding unit controller 160 provided in the control unit 200 are connected to the winding unit 20, the drawing unit 40, The metal wire 10 is fed out from the unwinding unit 20 by controlling the wire 60 so as to be drawn through the respective drawing units 40-1 to n and 90 and wound around the unwinding unit 60. [

The constitution of the drawing machine 100 will be described with reference to Figs. 1 and 2. Fig. 1, the n-stage draft unit 40 and the draft unit 90 are provided along the path through which the metal wire 10 is fed between the take-up unit 20 and the take-up unit 60, ) Are installed in series so as to sequentially consume the metal wires (10). Hereinafter, the respective drawing units 40 are referred to as drawing units 40-1 to 40-n from the drawing unit 20 toward the winding unit 60, respectively.

(The unwinding unit 20)

The unwinding unit 20 is constituted by an unwinding bobbin 22, guide rollers 24, 26, 28, 30 and a stepped portion 32. The metal wire 10 in the unwinding unit 20 is wound in the order of the unwinding bobbin 22, the guide roller 24, the guide roller 26, the step roller 34, the guide roller 26 and the guide roller 28 (Hereinafter, referred to as " tensioning ").

The unwinding bobbin (22) is rotatably installed in the housing (12) of the drawing machine (100). The take-up bobbin 22 is connected to the take-up motor 122 and rotates by the drive. Therefore, the metal wire 10 wound around the take-up bobbin 22 is drawn out and is sent out as a passing path. In this embodiment, the take-up bobbin 22 is speed-controlled by the take-up motor 122 and driven. That is, the winding unit controller 120 controls the driving of the winding motor 122 so that the winding bobbin 22 rotates at a predetermined speed.

The guide rollers 24, 26, 28, 30 are rotatably installed in the housing 12 of the drafting machine 100. The guide rollers 24, 26, 28 and 30 are wound a predetermined number of times so as to send out the metal wire 10 in a non slip manner. The guide rollers 24, 26, 28 and 30 are rotated by the tension imparted to the metal wire 10 by the drawing unit 40 and the metal wires 10 sent out from the take- Non-slip.

The stepped portion 32 includes a stepped roller 34, a stepped arm 36 and a torque motor 38 and applies a desired tension to the metal wire 10 fed out from the unwinding bobbin 22 .

The step roller 34 is rotatably supported on one end side of the stepped arm 36 formed in a bar shape. The metal wire 10 is extended in the order of the guide roller 24, the guide roller 26, the step roller 34, the guide roller 26 and the guide roller 28, A predetermined tension is applied in the direction toward the intermediate lower side.

The stepped arm 36 is disposed substantially horizontally in FIG. 1, that is, in a direction substantially perpendicular to the direction in which tension is applied to the metal wire 10 by the step roller 34, 36). The other end side of the stepped arm 36 is fixedly supported by the drive shaft of the torque motor 38 and the drive shaft of the torque motor 38 serves as the rotation shaft of the stepped arm 36.

The potentiometer 138 (Fig. 2) is installed on the drive shaft of the torque motor 38, and detects the tilt angle of the stepped arm 36. The potentiometer 138 is connected to the unwinding unit controller 120 and supplies the rotation angle detected by the potentiometer 138 to the drawing unit controller 140. In this embodiment, although the potentiometer 138 detects the rotation angle of the stepped arm 36, the position and displacement of the stepped roller 34, for example, the stepped roller 34, The position and displacement of the step roller 34 may be detected in the direction in which the tension is applied to the step roller 34. [ In this case, tension may be applied to the metal wire 10 by vertical movement (vertical movement in the direction to apply the tension to the metal wire) without rotating the step roller 34. [

The torque motor 38 applies a predetermined tension to the metal wire 10 through the stepped arm 36 and the step roller 34. That is, the torque motor 38 transmits the rotation torque of the torque motor 38 to the metal wire 10 through the stepped arm 36 and the step roller 34, and applies tension to the metal wire 10 do. The torque motor 38 is connected to the winding unit controller 120 and generates a predetermined rotation torque based on a command (torque command) of the winding unit controller 120.

The stepped portion 32 transfers the predetermined torque generated by the torque motor 38 to the metal wire 10 through the stepped arm 36 and the stepped roller 34 by the constitution, To the set tension. That is, the tension imparted to the metal wire 10 sent out from the unwinding unit 20 is determined in accordance with the rotation torque of the torque motor 38.

As described above, in the present embodiment, the winding unit 20 applies the predetermined tension to the metal wire 10 fed from the unwinding bobbin 22 at a constant speed so that the metal wire 10 The metal wire 10 can be fed to the drawing unit 40-1 in a state of having a desired tension.

(Fresh unit 40)

In the present embodiment, the drawing machine 100 is configured with the n-stage drawing units 40-1 to n and the drawing unit 90 at the final stage between the drawing unit 20 and the winding unit 60. [ The unwinding unit 20, the drawing units 40-1 to 90, and the winding unit 60 are connected and installed. The metal wire 10 delivered from the unwinding unit 20 passes through the drawing units 40-1, 40-2, ..., 40-n, 90 in this order, and is drawn. The drawn metal wire 10 from the drawing unit 90 is delivered to the winding unit 60. Unless the drawing units 40-1 to 40-n are individually specified, the drawing units 40-1 to 40-n will be referred to as " drawing units 40-1 to 40- Will be collectively referred to as " fresh unit 40 ". In addition, the respective constituents included in the drawing units 40-1 to 40-n will be collectively described in the same form.

The drawing unit 40 is constituted by a drawing die 42, guide rollers 44 and 46, and a driving cast 50. In the drawing unit 40, the metal wire 10 is extended over the guide roller 44, the drawing die 42, the guide roller 46, and the driving caster 50.

The fresh die 42 is provided between the guide roller 44 and the guide roller 46. When the metal wire 10 is drawn out through the corresponding die hole, the diameter of the metal wire 10 is reduced, and the metal wire 10 is drawn out from the metal wire 10, (10) is fresh. At this time, the diameter reduction rate (reduction rate of the cross sectional area) of the metal wire 10 is determined with respect to the diameter of the dice hole provided in the fresh die 42, and the metal wire 10 is drawn in accordance with the reduction rate. The diameter of the dies of the fresh die 40 at each end of the fresh units 40-1 to n is set such that the diameter of the drawn metal wire 10 in the fresh unit 40- .

In the present embodiment, the drawing units 40-1 to 40-n gradually reduce the diameter of the metal wire 10 passing therethrough. Therefore, the diameter of the dice hole provided in the fresh die 42-n is smaller than the diameter of the die hole formed in the fresh die 42-1. Further, the diameter of the die hole formed in the fresh die 42-1 is smaller than the diameter of the die hole formed in the die 42-1.

In the present embodiment, the fresh die 42 is accommodated in a die holder fixed to the housing 12. [ The drawing machine 100 may have means for measuring the drawing force when the metal wire 10 is drawn from the drawing die 42 and drawn. The means may be, for example, a means for detecting the force by which the fresh die 42 pushes the die holder and presses the die holder, and also detects the twist of the die holder fixed to the housing 12, Or may be means for measuring the machining force.

The metal wire 10 and / or the fresh die 42 are immersed in lubricating oil to prevent the metal wire 10 passing through the fresh die 42 from shaking or the like, and the stability thereof can be improved. Therefore, an oil tank for immersing the metal wire 10 and / or the fresh die 42 in the lubricating oil may be provided. For example, an oil tank may be disposed between the fresh die 42 and the guide roller 44 so that the metal wire 10 passes through the oil tank. In this case, it is preferable to have means for supplying the lubricating oil to the oil tank so that the lubricating oil flows over the oil tank during the drawing operation. Alternatively, the fresh dies 42 may be disposed in the oil tank, and the oil tanks may be arranged so that the metal wires 10 penetrate in the vertical and horizontal directions. However, seals are required for penetrating parts.

By immersing the metal wire 10 and / or the fresh die 42 in the lubricating oil, the following advantages can be obtained. It is possible to use the lubricant most suitable for the drawing process occurring in the fresh die 42 in each of the drawing units 40. The composition of the lubricating oil has a great influence on the consumption of the fresh die 42, but the lubricating oil having a composition specific to the drawing processing can be stably supplied by having the corresponding configuration. In addition, a lubricant circulation or cleaning system is required in order to reduce the contamination effect of the lubricant oil due to the friction between the metal wire 10 and the driving capstan 50. However, since the circulation or the cleaning system may be simple, Lt; / RTI >

The guide rollers 44 and 46 are rotatably installed in the housing 12 of the drafting machine 100. The guide rollers 44 and 46 are provided with distortion gages 152 and 156 and encoders 154 and 158 (see Fig. 2) at their shaft portions, respectively.

The strain gages 152 and 156 detect the twist of the guide rollers 44 and 46, respectively, and detect the tension of the metal wire 10. That is, the metal wire 10 in the drawing machine 100 has a predetermined tension at each position, the distortion gauge 152 detects the twist of the guide roller 44, (Hereinafter referred to as " front tension ") of the wire 10 is detected. The strain gage 156 detects the twist of the guide roller 46 and detects the tension of the metal wire 10 after passing through the fresh die 42 (hereinafter referred to as "back tension"). More specifically, the torsional gages 152 and 156 are arranged in such a manner that the tension of the metal wire 10 in the square sent when the metal wire 10 enters the guide rollers 44 and 46, And detects the resultant force with the tension of the metal wire 10 in the direction in which it is sent out from the rollers 44 and 46 by the corresponding twist.

The encoders 154 and 158 detect the speed at which the metal wire 10 is fed out by detecting the number of revolutions of the guide rollers 44 and 46, respectively. That is, the encoder 154 detects the rotation speed of the guide roller 44 and detects the speed at which the metal wire 10 is fed in front of the fresh die 42. The encoder 158 detects the rotational speed of the guide roller 46 and detects the speed at which the metal wire 10 is sent behind the fresh die 42. [

The driving capstan 50 is rotatably installed in the housing 12 of the drafting machine 100. The driving capstan 50 is connected to the driving motor 150 (see Fig. 2), and rotates at a predetermined torque based on a command from the drawing unit controller 140. [ The drive capstan 50 draws the metal wire 10 from the fresh die 42 by the rotation torque and feeds the drawn metal wire 10 to the next fresh unit 40 or the fresh unit 90 do.

The outer peripheral surface of the drive capstan 50 is sprayed and its durability is increased beyond its surface hardness and the slip between the surface of the drive capstan 50 (the surface of the drive capstan 50 and the metal wire 10) . The outer peripheral surface of the drive capstan 50 may be covered with an elastic body having a large friction coefficient (for example, a resin such as urethane or rubber). The metal wire 10 is pulled out from the drawing die 42 by the non-slip by the driving capstan 50 thus surface-processed and sent to the next stage.

(Fresh unit 90)

The drawing unit 90 is constituted by a drawing die 92, guide rollers 94 and 96, and a driving capstan 98. In the drawing unit 90, the metal wire 10 is extended over the guide roller 94, the drawing die 92, the guide roller 96, and the driving capstan 98.

The guide rollers 94 and 96 have substantially the same or the same configuration as the guide rollers 44 and 46 of the drawing unit 40. The driving capstan 50 has substantially the same or similar configuration as the driving capstan 50 of the drawing unit 40 except that the driving capstan 50 is speed-controlled by the drawing unit controller 140.

The fresh die 92 has substantially the same or the same shape as the fresh die 42 of the drawing unit 40 except that it has a function of appropriately adjusting (adding or reducing) the stress or torsion of the metal wire 10 . Specifically, the fresh die 92 is provided so as to freely adjust the angle of the center axis of the die hole with respect to the direction in which the metal wire 10 is drawn. Further, the fresh die 92 is provided so that the position of the die hole can be freely adjusted in a direction substantially perpendicular to the direction in which the metal wire 10 is pulled out. Therefore, it is possible to straighten the metal wire 10 or curl it if necessary. In addition, since the axial direction of the die hole can be adjusted corresponding to the drawing direction of the metal wire 10, it is possible to suppress the wear of the die.

(Winding unit 60)

The winding unit 60 is constituted by guide rollers 66, 68 and 70, a stepped portion 72 and a winding bobbin 80. [ In the winding unit 60, the metal wire 10 is extended in the order of the guide roller 66, the step roller 74, the guide rollers 66, 68, and 70, and the winding bobbin 80 in this order.

The guide rollers 66, 68 and 70 are rotatably installed in the housing 12 of the drafting machine 100. The guide rollers 66, 68 and 70 are wound a predetermined number of times so as to send the metal wire 10 to the non-slip state, respectively. The guide rollers 66, 68 and 70 are rotated by the tension applied to the metal wire 10 by the rotation of the winding bobbin 80, To the non-sleep state.

The stepped portion 72 is constituted by a step roller 74, a stepped arm 76 and a torque motor 78 and adds a desired tension to the fresh metal wire 10 in the drawing unit 90.

The step roller 74 is rotatably supported on one end side of the stepped arm 76 formed in a bar shape. The metal wire 10 is extended in the order of the guide roller 66, the step roller 74, the guide roller 66, the guide roller 68 and the guide roller 70, A predetermined tension is applied in the downward direction.

The stepped arm 76 is disposed substantially horizontally in FIG. 1, that is, in a direction substantially perpendicular to the direction in which tension is applied to the metal wire 10 by the step roller 74, 76). The other end of the stepped arm 76 is fixedly supported by the drive shaft of the torque motor 78 and the drive shaft of the torque motor 78 serves as the rotation shaft of the stepped arm 76.

The potentiometer 178 (Fig. 2) is installed on the drive shaft of the torque motor 78 and detects the tilt angle of the stepped arm 76. The potentiometer 178 is connected to the winding unit controller 160 and supplies the rotation angle detected by the potentiometer 178 to the winding unit controller 160.

The torque motor 78 applies a predetermined tension to the metal wire 10 through the stepped arm 76 and the step roller 74. That is, the torque motor 78 transmits the rotation torque of the torque motor 78 to the metal wire 10 through the stepped arm 76 and the step roller 74, and gives tension to the metal wire 10 . The torque motor 78 is connected to the winding unit controller 160 and generates a predetermined rotation torque based on a command (torque command) of the winding unit controller 160.

The winding bobbin (80) is rotatably installed in the housing (12) of the drawing machine (100). The winding bobbin 80 is connected to a winding motor 180, and is rotated by driving. Thus, the drawn metal wire 10 in the drawing unit 90 is wound on the winding bobbin 80. In the present embodiment, the winding bobbin 80 is driven by a winding motor 180 with speed control. That is, the winding unit controller 160 controls the driving of the winding motor 180 so that the winding bobbin 80 rotates at a predetermined speed. Specifically, the winding unit controller 160 controls the rotation speed of the winding motor 180 based on the rotation speed of the drive capstan 98 and the rotation angle of the stepped arm 76. [

As described above, in this embodiment, in the winding unit 60, the stepped portion 72 applies a predetermined tension to the metal wire 10 fed out from the drawing unit 90, while the winding bobbin 80 is rotated at a constant speed, (10).

(Drawing operation of drawing machine 100)

Next, the operation of the drawing machine 100 configured as described above to draw the metal wire 10 will be described with reference to Figs. 1 and 2. Fig. In the following example, BTi denotes the back tension of the metal wire 10 drawn by the fresh die 42 of the i-th stage drawing unit 40 among the n-staged draft units 40, FTi denotes the front tension, The rotation torque of the drive capstan 50 is referred to as CTi (i is a positive integer equal to or smaller than n).

(Embodiment 1)

In the first embodiment, the rotation torque of the driving capstan 50 is controlled based on the front tension of the metal wire 10 in each drawing unit 40, and the metal wire 10 is drawn. Specifically, after the metal wire 10 is attached to the respective constitutions of the unwinding unit 20, the drawing unit 40 and the winding unit 60, the metal wire 10 is drawn do.

(Operation of the unwinding unit 20)

First, the unwinding unit 20 sends out the metal wire 10 from the unwinding unit 20 at a substantially constant speed. That is, the unwinding unit controller 120 controls the speed at which the metal wire 10 is fed from the unwinding unit 20 (hereinafter, the speed at which the metal wire 10 is fed from each position of the passage) Controls the number of revolutions of the take-up motor 122 so that it is maintained at a substantially constant speed corresponding to the speed at which the metal wire 10 is fed out from the drive capstan 90.

The winding unit controller 120 of the present embodiment uses the linear velocity of the metal wire 10 as the feed forward signal and the rotation angle of the stepped arm 36 as the feedback signal in the guide roller 44, 122 of the engine. More specifically, the speed at which the metal wire 10 is fed from the unwinding unit 20, that is, the linear velocity of the metal wire 10 passing through the guide roller 44, And is supplied to the drawing unit controller 140. Then, the unwinding unit controller 120 sets the speed signal indicative of the linear speed as a feed forward signal, and supplies the feed forward signal to the unwinding motor 122 to control the rotation of the unwinding motor 122.

On the other hand, when the step arm is rotated to apply a predetermined tension to the metal wire 10 fed out from the unwinding bobbin 22, the linear velocity of the metal wire 10 fed out from the unwinding bobbin 22, A predetermined error occurs between the linear velocity of the metal wire 10 passing through the wire 44. The unwinding unit controller 120 generates a feedback signal based on the rotation angle detected by the potentiometer 138, controls rotation of the rotation motor 122, and corrects the deviation of the linear velocity due to the error And keeps the linear velocity of the metal wire 10 fed out from the unwinding unit 20 substantially constant.

More specifically, the unwinding unit controller 120 detects a rotation angle deviation between the corresponding rotation angle of the step arm 36 detected by the potentiometer 138 and the rotation angle when the step arm 36 is at the reference position . Then, the winding unit controller 120 determines the rotational speed of the take-up motor 22 so that the rotational angle deviation approaches zero and supplies the rotational speed command to the take-up motor 122 based thereon. The unwinding unit controller 120 uses the rotation angle deviation as a feedback signal and controls the rotation speed of the take-up motor 22 under the control of, for example, the P control PI control PID control.

The number of revolutions of the take-up bobbin 22 corresponding to the diameter of the metal wire 10 wrapped around the take-up bobbin 22 It is necessary to control the winding unit 20 so that the metal wire 10 maintains the predetermined tension while maintaining the linear velocity of the metal wire 10 fed out from the unwinding unit 20 by the above- A predetermined tension is applied. The corresponding tension becomes the back tension BT1 of the metal wire 10 passing through the fresh die 42-1. For example, the unwinding unit controller 120 controls the unwinding unit 20 so that BT1 is set to a predetermined value on the metal wire 10 so as to be about 10% of the yield stress of the metal wire 10 wound on the unwinding bobbin 22 Give tension.

In this embodiment, the winding unit controller 120 controls the rotation speed of the winding motor 122 to control the rotation angle of the step arm 36 while maintaining the wire speed of the metal wire 10 substantially constant The winding unit controller 120 is configured to control the rotation speed and / or the rotation torque of the winding motor 122 without providing the stepped portion 32, The tension and / or the linear velocity of the wire 10 may be controlled. Therefore, it is also possible to further reduce the number of the stepped portions 32 in the drawing machine 100.

In the unwinding unit 20, for example, a tension gauge or the like may be provided on the guide roller 28 or the guide roller 30, and the tension of the metal wire 10 may be measured. In this case, the unwinding unit controller 120 may set the difference between the set tension and the tension measured at the torsional gauge or the like as a feedback signal and feedback control the rotational torque of the torque motor 38. Therefore, it is possible to apply a predetermined tension to the metal wire 10 so that the tension of the metal wire 10 is closer to the set tension.

(Operation of the drawing unit 40)

Next, a description will be given of the operation in which each drawing unit 40 draws the metal wire 10 fed out from the drawing unit 20.

The drawing unit 40-1 of the first stage is configured so that the rotational torque CT1 of the driving capstan 50-1 is set to be smaller than the rotational torque CT1 of the driving capstan 50-1 on the basis of the front tension FT1 of the metal wire 10 passing through the drawing die 42-1 And the metal wire 10 is dried. More specifically, the rotational torque CT1 of the drive capstan 50-1 is set to be smaller than the front tension FT1 of the metal wire 10 passing through the fresh die 42-1 and the forward tension FT1 of the fresh unit 40- 2 with the rear tension BT2 of the metal wire 10 passing through the fresh die 42-1.

CT1 = FT1-BT2

Therefore, if the front tension FT1 of the first stage can be measured, the rear tension BT2 of the second stage can be controlled to a predetermined value by controlling the rotation torque CT1 of the first stage. In the present embodiment, the drawing unit controller 140 calculates the rear tension (FT1) of the second stage based on the front tension FT1 of the metal wire 10 measured by the torsion gauge 156 installed on the guide roller 46-1 And controls the rotation torque CT1 of the drive capstan 50-1 so that the rotation speed BT2 becomes a predetermined value. That is, the drawing unit controller 140 feed-forward controls the rotation torque CT1 based on the front tension FT1. Thus, the metal wire 10 is pulled out to the non-slip state by the pulling force of the front tension FT1 from the fresh die 42-1 by the driving capstan 50-1 and at the same time, Slip to the unit 40-2. For example, the back tension BT2 is about 10% of the yield stress of the metal wire drawn from the fresh die 42-1.

The second-stage drawing unit 40-2 further draws the metal wire 10 in the same manner as the first-stage drawing unit 40-1. That is, the drawing unit controller 140 calculates the rear tension BT3 of the third stage based on the front tension FT2 of the metal wire 10 measured by the strain gage 156 installed on the guide roller 46-2. And controls the rotation torque CT2 of the drive capstan 50-2 to be a predetermined value.

CT2 = FT2-BT3

In the same manner, in the drawing unit controller 140, the front tension of the metal wire 10 measured by the strain gage 156 installed on the guide roller 46-i in the drawing unit 40-i at the i- And controls the rotational torque CTi of the drive capstan 50n so that the rear tension BTi + 1 of the third stage is a predetermined value based on the rotational force FTi.

CT (i) = FT (i) -BT (i + 1)

Therefore, the metal wire 10 is pulled out into the non-slip state by the pulling force of the front tension FTi from the fresh die 42i by the driving capstan 50i, and at the same time, the rearward tension BTi + 40i + 1, or the fresh unit 90). When i = n in the above equation, the rear tension BT (i + 1) of the metal wire 10 drawn by the fresh die 92 of the drawing unit 90 is obtained.

In the present embodiment, the drawing unit controller 140 controls the rotational torque CT of the driving capstan 50 by setting the rear tension BTi + 1 as a set value, but the front tension FTi and the rear tension (BTi + 1) may be measured to control the rotation torque CT of the drive capstan 50. [ The drawing force (DT) may be measured in each of the fresh dies (42) to control the rotation torque (CT) of the driving capstan (50). Therefore, in the drawing die 42, the drawing processing force can be measured at the time of drawing operation.

According to the present embodiment, the driving capstan 50 sets the rear tension BTi + 1 at the next stage based on the measured front tension FTi. That is, in the present embodiment, since the front tension is actually measured at each end, the error (difference between the set value and the actual value of the back tension) generated in the rear tension of the end of the step is the front tension The back tension and the front tension of < / RTI > In addition, a factor that causes an error between the set value of the rear tension and the actual value is merely a mechanical error in the driving capstan 50. Therefore, according to the present embodiment, it is possible to provide a drawer with an extremely small error between the set value of the back tension and the actual value.

(Operation of the drawing unit 90)

Next, the drawing unit 90 will explain the drawing operation of the metal wire 10 sent out from the drawing unit 40-n. In the following, the operation of the drawing unit 90 will be described focusing on the difference from the operation of the drawing unit 40. [

The drawing unit 90 appropriately adjusts the stress or twist of the metal wire 10 to be drawn in the drawing unit 40-n and determines the linear velocity of the metal wire 10 to be sent to the winding unit 60 It is.

Concretely, the metal wire 10 drawn by the fresh die 42-n of the drawing unit 40-n is moved in the direction in which the metal wire 10 is fed, particularly when the area reduction rate of the fresh die is large And has stress or twist in the vertical direction. The fresh die 92 imparts the drawing force more uniformly to the metal wire 10 than the fresh die 42-n from the periphery thereof, and appropriately adjusts the stress or twist.

The drive capstan 98 also determines the linear velocity of the metal wire 10 in the drawer 100. That is, the drawing unit controller 140 supplies the rotation speed command to the driving motor 198 so that the linear speed of the metal wire 10 becomes a predetermined speed, and rotates the driving motor 198. The drive motor 198 controls the number of revolutions of the drive capstan 98 based on the command. For example, the drawing unit controller 140 controls the number of revolutions of the driving capstan 98 so that the linear velocity at which the metal wire 10 is sent to the winding unit 60 is 100 m / min.

The drawing unit controller 140 controls the number of revolutions of the metal wire 10 fed from the driving capstan 98 based on the number of revolutions of the guide roller 96 detected by the encoder 158 installed on the guide roller 96 The linear velocity may be measured, the linear velocity may be used as the feedback signal, and the number of revolutions of the driving motor 198 may be fed back.

According to the present embodiment, the driving capstan 50 of the drawing unit 40 is torque-controlled and the driving capstan 80 of the drawing unit 90 is speed-controlled, The tension and the linear velocity of the metal wire 10 can be further stabilized.

(Operation of the winding unit 60)

The winding unit 60 winds the metal wire 10 from the unwinding unit 20 so that the linear velocity of the metal wire 10 to be drawn in each drawing unit 40 is substantially constant. That is, the winding unit controller 160 controls the number of revolutions of the winding motor 180 so that the linear velocity of the metal wire 910 supplied to the winding unit 60 is kept substantially constant.

In this embodiment, the winding unit controller 160 sets the number of revolutions of the driving capstan 98 at the front end of the winding unit 60, that is, the linear velocity of the metal wire 10, And controls the rotation number of the winding motor 180 by using the rotation operation of the stepped arm 76 as a feedback signal. Specifically, the linear velocity of the metal wire 10 passing through the driving capstan 98 is detected by an encoder installed in the driving capstan 98, and is supplied to the drawing unit controller 140. Then, the winding unit controller 160 sets the speed signal indicative of the linear velocity as a feed forward signal and supplies the feed forward signal to the winding motor 180 to control the rotation of the winding motor 180. [

Further, the winding unit controller 160 generates a feedback signal based on the rotation angle detected by the potentiometer 178, and controls the rotation of the winding motor 180.

More specifically, the winding unit controller 160 detects a rotation angle deviation between the corresponding rotation angle of the step arm 76 detected by the potentiometer 178 and the rotation angle when the step arm 76 is at the reference position . Then, the winding unit controller 160 determines the rotation speed of the winding motor 180 so that the rotation angle deviation becomes close to zero, and supplies a rotation speed command based on the rotation speed to the winding motor 180. [ The winding unit controller 160 uses the rotation angle deviation as a feedback signal and controls the rotation speed of the winding motor 180 by controlling, for example, P control, PI control, PID control, and the like.

The winding unit 60 is capable of winding the metal wire 10 out of the drawing unit 40-n without depending on the winding amount of the metal wire 10 already wound on the winding bobbin 80 by the above- (I.e., the linear velocity of the metal wire 10 in the drive capstan 98) is kept substantially constant while the linear velocity and the metal wires 10 passing through the guide rollers 68, The metal wire 10 can be wound around the winding bobbin 80 so that the metal wire 10 is not generated.

The wire drawing machine 100 can draw the metal wire 10 wound on the unwinding bobbin 22 from the drawing units 40 and 90 and wind it in the winding bobbin 80 by the above operation. For example, when the drawing machine 100 has five drawing units 40 (that is, n = 5) and the metal wire 10 wound on the drawing bobbin 22 is a piano wire having a diameter of 120 탆 The diameter of the metal wire 10 wound around the winding bobbin 80 is 80 mu m when the five fresh dies 42 have dice holes diameters of 111 mu m, 102 mu m, 94 mu m, 87 mu m and 80 mu m, respectively do.

(Second Embodiment)

In the second embodiment, the value of the front tension of the metal wire 10 (hereinafter referred to as "sample value") measured when the drive capstan 50 is rotated by speed control in each drawing unit 40 On the basis of which the driving capstan 50 is rotated by torque control without speed control to draw the metal wire 10 from the drawing die 42 and is fresh.

In the drawing machine 100, first, the metal wire 10 is extended to each drawing unit 40 before the drawing operation is performed. In the present embodiment, in each drawing unit 40, the tip end portion of the metal wire 10 is finely machined to pass through the dice hole of the fresh die 42, the driving capstan 50 is rotated by the speed control, The wire 10 is pulled out from the drawing die 42 and is wound around the driving capstan 50 to a predetermined length (hereinafter, referred to as 'operation movement'). The front tension of the metal wire 10 is referred to as a sample value FT 'of the front tension when the metal wire 10 is pulled out from the drawing die 42 in the speed control during the corresponding operation, Carry out an operation.

(Operation of operation movement)

In this embodiment, after the metal wire 10 is extended in the unwinding unit 20, the metal wire 10 is wound around the guide roller 44-1, the fresh die 42-1 and the guide roller 46-1. The drawing unit controller 140 then rotates the driving capstan 50-1 at a substantially constant speed by speed control and winds the metal wire 10 on the driving capstan 50-1 for a predetermined length . The drawing unit controller 140 stores the front tension FT1 of the metal wire 10 detected by the strain gage 156 installed on the guide roller 46 as the sample value FT1 'of the front tension FT1 . FT1 'may be an instantaneous value of the front tension FT1, or may be an average value.

In the same manner, the drawing unit controller 140 also acquires the sample values FT2 'and FT3' of the front tension FT2 and FT3 of the metal wire 10 in the drawing units 40-2 and C, do.

Next, in the present embodiment, the operation of the drawing machine 100 to draw the metal wire 10 will be described. The drawing unit 20, the drawing unit 90 and the winding unit 60 operate in the same manner as in the first embodiment in the present embodiment, and therefore the operation of the drawing unit 40 will be described below.

(Operation of the drawing unit 40)

The drawing unit 40-1 of the first stage controls the rotation torque CT1 of the driving capstan 50-1 based on the sample value FT1 'of the previously obtained front tension FT1, 10) is fresh. In the present embodiment, FT1 'is a sample value acquired with the set value BT1 added as the back tension of the metal wire 10. Therefore, the sample value DT1 'of the drawing process of the fresh die 42-1 can be calculated based on the following.

DT1 '= FT1'-BT1

The rotational torque CT1 of the driving capstan 50-1 is set to be smaller than the front tension FT1 of the metal wire 10 passing through the fresh die 42-1 and the front tension FT1 of the metal wire 10 passing through the fresh die 40-2 of the second- And the rear tension BT2 of the metal wire 10 passing through the metal wire 42-1.

CT1 = FT1-BT2

The front tension FT1, the back tension BT1 and the drawing force DT1 have the following relationship.

FT1 = BT1 + DT1

Therefore, in the present embodiment, the rotational torque CT1 of the drive capstan 50-1 becomes as follows based on the backward tension BT1, BT2, a set value) and the drawing force (DT1 ', sample value).

CT1 = BT1 + DT1 ' -BT2

In the present embodiment, the drawing unit controller 140 determines that the rear tension BT2 is equal to or greater than a predetermined value BT2 based on the set value of the backward tension BT1 and the sample value DT1 ' Feed-forward control of the rotation torque CT1 of the drive capstan 50-1. Therefore, the metal wire 10 is pulled out to the non-slip state by the drawing force of FT1 'from the drawing die 42-1 by the driving capstan 50-1 and at the same time, Slip to the unit 40-2.

The drawing unit 40-2 of the second stage is formed in the same shape as the draft unit 40-1 of the first stage and has a set value of the backward tension BT2 and a sample value of the drawing force Forward control of the rotational torque CT2 of the drive capstan 50-2 so that the rear tension BT3 becomes a predetermined value based on the torque DT2 '.

CT2 = BT2 + DT2 ' -BT3

In the same manner, the drawing unit controller 140 calculates the rear tension BTi based on the set value of the rear tension BTi of the ith stage and the sample value DTi 'of the previously obtained drawing force by the following equation, 1) of the driving capstan 50i to a predetermined value.

CT (i) = BT (i) + DT (i) '- BT (i + 1)

Therefore, the metal wire 10 is pulled out into the non-slip state by the pulling force of FTi 'from the fresh die 42i by the driving capstan 50i, and at the same time, in the state where the backward tension BTi + 40i + 1, or the fresh unit 90). When i = n in the above equation, the back tension of the metal wire 10 drawn by the fresh die 92 of the drawing unit 90 becomes BTi + 1.

In this embodiment, since DT1 'is the sample value of the drawing process force in the drawing operation, that is, the drawing process force is not observed in the drawing operation, it is assumed that the metal wire 10 wound around the driving capstan 50 Even if it is loosened, DT1 'does not change. Accordingly, in this embodiment, the drawing machine 100 further preferably has a configuration in which the metallic wire 10 wound around the driving capstan 50 is pushed and pressed against the driving capstan 50. The push-push configuration may be, for example, a roller.

In the present embodiment, the value of the front tension is acquired as the sample value at the time of the operation, but the method of obtaining the sample value is not limited to this.

According to the present embodiment, since the rotational torque CT of the drive capstan 50 is controlled by the sample value and there is no need to have a configuration for actually measuring the front tension and the back tension in the drawing operation, . According to the present embodiment, since the rotation torque CT of the drive capstan 50 is controlled by the sample value and the rotation torque CT of the drive capstan 50 does not fluctuate due to the disturbance, A stable drawing machine can be provided.

(Third Embodiment)

In the third embodiment, in addition to the second embodiment, the rear tension BT of the metal wire 10 is further measured. In the present embodiment, the rotational torque of the drive capstan 50 at the predetermined stage is subjected to feed forward control based on the front tension FT at the same stage and the rear tension BT at the next stage. In the present embodiment, feedback control is performed so that the measured rear tension BT becomes a predetermined value.

In the present embodiment, the drawing unit 20, the drawing unit 90, and the winding unit 60 have been described in the present embodiment with respect to the operation in which the drawing machine 100 draws the metal wire 10. However, And the sample value is acquired in the same manner as in the second embodiment. Hereinafter, the operation of the drawing unit 40 at the time of the drawing operation will be described.

(Operation of the drawing unit 40)

The drawing unit 40-1 of the first stage controls the rotation torque CT1 of the driving capstan 50-1 on the basis of the sample value FT1 'of the previously obtained front tension FT1, 10) is fresh. In the present embodiment, FT1 'is a sample value obtained in a state where the measured value BT1' is added as the back tension of the metal wire 10. Therefore, the sample value DT1 'of the drawing processing force of the drawing die 42-1 can be calculated based on the following.

DT1 '(sample value) = FT1' (sample value) -BT1 '(measured value)

The rotational torque CT1 of the driving capstan 50-1 is set to be smaller than the front tension FT1 of the metal wire 10 passing through the fresh die 42-1 and the front tension FT1 of the metal wire 10 passing through the fresh die 40-2 of the second- And the rear tension BT2 of the metal wire 10 passing through the metal wire 42-1.

CT1 = FT1-BT2

The drawing unit controller 140 feeds back the rotation torque CT1 of the driving capstan 50-1 by the above equation. That is, the drawing unit controller 140 controls the rotation torque CT1 of the driving capstan 50-1 so that the measured value of the rear tension BT2 approaches the set value.

The front tension FT1, the back tension BT1 and the drawing force DT1 have the following relationship.

FT1 = BT1 + DT1

In this embodiment, the rotational torque of the driving capstan 50-1 is also feed-forward controlled, and the feedforward amount CT1 'thereof is larger than the rear tension BT1 and BT2 (both set values) and the drawing force DT1' , And a sample value).

CT1 '= BT1 (setting value) + DT1' (sample value) -BT2 (setting value)

In the present embodiment, the drawing unit controller 140 determines that the rear tension BT2 is smaller than the predetermined value BT2 based on the set value of the back tension BT1 and the sample value DT1 ' Forward control of the rotational torque CT1 of the drive capstan 50-1 so as to be equal to the value of the rotational torque CT1 of the drive capstan 50-1. Therefore, the metal wire 10 is pulled out to the non-slip state by the drawing force of FT1 'from the drawing die 42-1 by the driving capstan 50-1 and at the same time, Slip to the unit 40-2.

The drawing unit 40-2 of the second stage is formed in the same shape as the draft unit 40-1 of the first stage and has a set value of the backward tension BT2 and a sample value of the drawing force Forward control of the rotational torque CT2 of the drive capstan 50-2 so that the rear tension BT3 becomes a predetermined value based on the torque DT2 '.

CT2 = BT2 + DT2 ' -BT3

In the same form, the drawing unit controller 140 calculates the rear tension (BTi) based on the set value of the rear tension BTi of the ith stage and the sample value DTi 'of the previously obtained drawing force by the following equation Forward control of the rotational torque CTi of the drive capstan 50i such that the rotational speed BTi + BTi + 1 becomes a predetermined value.

CT (i) = BT (i) + DT (i) '- BT (i + 1)

Therefore, the metal wire 10 is pulled out into the non-slip state by the pulling force of FTi 'from the fresh die 42i by the driving capstan 50i, and at the same time, in the state where the backward tension BTi + 40i + 1, or the fresh unit 90). When i = n in the above equation, the back tension of the metal wire 10 drawn by the fresh die 92 of the drawing unit 90 becomes BTi + 1.

According to the present embodiment, since the back tension of the metal wire 10 is controlled to be fed back, in the same manner as in the first embodiment, the error between the sample value and the actual value of the drawing process force or the front tension continues to the rear tension It is possible to prevent accumulation. In the present embodiment, since the back tension is measured, the drawing force of the drawing die 42 can be calculated based on the measured back tension and the rotational torque of the driving capstan 50. [

According to the drawing machine and drafting method described above, it is not necessary to form a step on the drawing unit, so that the construction can be simplified. In addition, it is possible to arbitrarily set the rear tension and the area reduction rate of the metal wire, and thus to provide a drawing machine capable of arbitrarily adjusting the drawing processing conditions. Therefore, according to the drawing machine and drafting method of the present embodiment, it is possible to reduce the consumption of the drawing die by arbitrarily setting the rear tension, and by setting the area decreasing rate arbitrarily, . According to the drawing machine and drafting method of the present embodiment, since the drawing conditions such as the drawing speed, the rear tension, and the front tension can be arbitrarily adjusted, the metal wire having various characteristics such as the diameter and the bent diameter of the wire, It is possible to produce a metal wire excellent in properties such as fracture load and tensile strength.

The embodiments and applications described through the embodiments of the present invention can be appropriately combined, modified or modified in correspondence with the use, and the present invention is not limited to the description of the embodiments described above. It should be apparent from the description of the claims that such a combination, modification, or modification may be included in the technical scope of the present invention.

10 ... metal wire 11 ... metal wire
20 ... withdrawing unit 22 ... withdrawing bobbin
22 ... release motor 24, 26, 28 ... guide roller
32 ... stepped portion 34 ... stepped roller
36 ... stepped arm 38 ... torque motor
40 ... fresh unit 42 ... fresh die
44, 46 ... guide roller 50 ... driving capstan
60 ... take-up unit 66, 68, 70 ... guide roller
72 ... step 74 ... step roller
76 ... step arm 78 ... torque motor
80 ... wound bobbin 92 ... fresh die
94, 96 ... guide roller 98 ... driving capstan
100 ... Drawer 110 ... System controller
120 ... withdrawal unit controller 122 ... withdrawal motor
138 ... potentiometer 140 ... fresh unit controller
150 ... Driving motors 152, 156 ... Distortion gauge
154, 158 ... encoder 160 ... wound-up unit controller
178 ... potentiometer 180 ... coiling motor
200 ... control unit BT ... rear tension
CT ... Rotational torque CT ... Pulling force
FT ... front tension

Claims (9)

A first drawing die for drawing the metal wire by reducing the diameter of the passing metal wire,
A rear tension controller for controlling a first rear tension of the metal wire passing through the first fresh dies,
A first capstan for drawing the metal wire passing through the first drawing die into a non slip form from the first drawing die at a first front tension,
A first front tension measuring unit for measuring the first front tension,
A first capstan control unit for controlling a rotation torque of the first capstan based on the first front tension measured;
And a take-up portion for winding up the metal wire. The method according to claim 1,
A second fresh die provided between the first capstan and the rewinding portion and passing through the metal wire drawn by the first capstan and drawing the metal wire by reducing the diameter of the metal wire passed through Respectively,
The first capstan sending the metal wire to the second fresh die in a non-slip manner,
Wherein the first capstan control unit controls the rotation torque of the first capstan based on the first front tension so that a second rear tension of the metal wire passing through the second fresh dies becomes a predetermined value. The method of claim 2,
A second capstan for drawing the metal wire passed through the second fresh dies to a non-slip from the second fresh die at a second front tension,
A third fresh die installed between the second capstan and the rewinding portion and passing through the metal wire pulled by the second capstan and reducing the diameter of the metal wire that has passed through the third fresh die,
A second front tension measuring unit for measuring the second front tension,
Further comprising a second capstan control unit for controlling a rotation torque of the second capstan based on the second front tension measured,
And the second capstan control portion controls the rotation torque of the second capstan based on the second front tension so that a third rear tension of the metal wire passing through the third fresh dies is a predetermined value. The method according to claim 1,
Further comprising an unwind portion for sending the metal wire to the first drawing die,
And the rear tension control unit is a step difference between the winding unit and the first drawer for controlling the first rear tension of the metal wire. A first drawing die for drawing the metal wire by reducing the diameter of the passing metal wire,
A rear tension controller for controlling a first rear tension of the metal wire passing through the first fresh dies,
A first capstan for drawing the metal wire passing through the first fresh die into a non slip form from the first fresh die,
A first capstan control unit for controlling the rotation torque of the first capstan and drawing the metal wire from the first fresh dies,
And a winding portion for winding up the metal wire,
The first capstan control unit includes:
A first front tension of the metal wire is stored in advance when the metal wire is pulled out from the first drawing die by rotating the first capstan by speed control,
And controlling the rotational torque of the first capstan based on the first front tension to pull the metal wire out of the first fresh die. The method of claim 5,
Wherein the first capstan control unit controls the first capstan to rotate the first capstan by a speed control for a predetermined period to draw the average torque of the first capstan when the metal wire is pulled out from the first drawing die, . The method of claim 5,
A second fresh die installed between the first capstan and the rewinding portion and adapted to pass the metal wire drawn by the first capstan and reduce the diameter of the metal wire passing therethrough,
And a rear tension measuring unit for measuring a second rear tension of the metal wire passed through the second fresh dies,
Wherein the first capstan sends the metal wire to the second fresh die in a non-slip manner,
Wherein the first capstan control unit controls the rotation torque of the first capstan so that the measured second back tension is a predetermined value. 1. A drawing method for drawing a metal wire by passing through a fresh die to reduce the diameter of the metal wire,
Controlling the back tension of the metal wire passing through the fresh die,
Pulling the metal wire passing through the fresh die with non-slip from the fresh die at a predetermined front tension using a capstan,
Measuring the front tension,
And controlling the rotational torque of the capstan based on the measured front tension. 1. A drawing method for drawing a metal wire by passing through a fresh die to reduce the diameter of the metal wire,
Controlling the back tension of the metal wire passing through the fresh die,
Pulling the metal wire passing through the fresh die from the fresh die into a non-slip using a capstan,
And a control step of controlling the rotation torque of the capstan,
Wherein the control step comprises:
A step of previously storing the front tension of the metal wire when the metal wire is pulled out from the drawing die by rotating the capstan by speed control,
Controlling the rotational torque of the capstan based on the front tension, and drawing the metal wire from the first fresh die.

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