JP5325356B1 - Wire drawing machine and wire drawing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a non-slip type wire drawing machine with little dancer.
A first wire drawing die for reducing the diameter of a metal wire passing therethrough and drawing the metal wire, and a first back tension of the metal wire passing through the first wire drawing die are controlled. The back tension control unit, the first capstan that pulls the metal wire passing through the first wire drawing die from the first wire drawing die with the first front tension in a non-slip manner, and the first front tension are measured. A first capstan control unit that controls the rotational torque of the first capstan based on the first front tension measuring unit, and the measured first front tension, and a drawn metal wire are wound. A wire drawing machine equipped with a take-up unit.

Description

  The present invention relates to a wire drawing machine and a wire drawing method for drawing a metal wire. In particular, the present invention relates to a wire drawing machine and a wire drawing method for drawing metal wires in a non-slip manner.

  As a conventional wire drawing machine, for example, there is one called a slip-type wire drawing machine described in JP-A-2003-53418 (Patent Document 1). In the above conventional slip type wire drawing machine, the rotation speed of the capstan is set to be faster than the wire speed of the metal wire, and the capstan and the metal wire are slipped, and the capstan removes the wire from the wire drawing die. The metal wire was pulled out and drawn.

JP 2003-53418 A

  However, in the above conventional slip type wire drawing machine, the slip rate must be strictly controlled, and it is difficult to control the slip rate, particularly when a metal wire having a thin wire diameter is drawn. There was a problem.

  In order to solve the above-described problem, according to a first embodiment of the present invention, a first wire drawing die for reducing a diameter of a metal wire passing therethrough and drawing the metal wire, and the first wire drawing die. A back tension control unit that controls a first back tension of the metal wire passing through the wire die, and the metal wire passing through the first wire drawing die is connected to the first wire with a first front tension. Based on the first front tension measuring unit that measures the first front tension, the first capstan that is pulled out from the die in a non-slip manner, the first capstan There is provided a wire drawing machine including a first capstan control unit for controlling rotational torque and a winding unit for winding the drawn metal wire.

  The wire drawing machine is provided between the first capstan and the winding unit, and the metal wire pulled out by the first capstan passes therethrough, and the diameter of the metal wire passed through. A second wire drawing die for reducing the wire diameter and drawing the metal wire, and the first capstan sends the metal wire to the second wire drawing die in a non-slip manner. The capstan controller controls the first capstan based on the first front tension so that the second back tension of the metal wire passing through the second wire drawing die becomes a predetermined value. The rotational torque may be controlled.

  Further, the wire drawing machine includes a second capstan that non-slips the metal wire passing through the second wire drawing die from the second wire drawing die with a second front tension, and the second wire pulling die. The metal wire provided between the capstan and the winding portion passes through the metal wire pulled out by the second capstan, and the metal wire is drawn by reducing the diameter of the metal wire that has passed through. , A third wire drawing die, a second front tension measuring unit for measuring the second front tension, and a rotational torque of the second capstan based on the measured second front tension. A second capstan control unit for controlling, wherein the second capstan control unit has a third back tension of the metal wire passing through the third wire drawing die having a predetermined value. As it may control the rotational torque of the second capstan on the basis of the second front tension.

  The wire drawing machine further includes an unwinding unit for feeding the metal wire to the first wire drawing die, and the back tension control unit is provided between the unwinding unit and the first wire drawing machine. The dancer may control the first back tension of the metal wire.

  According to the 2nd form of this invention, the diameter of the metal wire which passes is reduced, the 1st wire drawing die | dye which draws the said metal wire, and the said metal wire which passes the said 1st wire drawing die | dye A back tension control unit that controls the first back tension, a first capstan that non-slips the metal wire passing through the first wire drawing die, and the first wire A first capstan control unit that controls the rotational torque of one capstan and pulls the metal wire out of the first wire drawing die; and a winding unit that winds up the drawn metal wire. The first capstan control unit rotates the first capstan by speed control to pull out the metal wire from the first wire drawing die, and the first front tension of the metal wire Is stored in advance, Based on the first front tension controls the rotational torque of the first capstan, withdrawing the metal wire from the first wire-drawing dies, to provide a wire drawing machine.

  In the wire drawing machine, the first capstan control unit rotates the first capstan for a predetermined period by speed control to pull out the metal wire from the first wire drawing die. An average torque of one capstan may be stored as the first front tension.

  The wire drawing machine is provided between the first capstan and the winding unit, and the metal wire pulled out by the first capstan passes therethrough, and the diameter of the metal wire passed through. A second wire drawing die for drawing the metal wire by reducing the wire wire, and a back tension measuring unit for measuring the second back tension of the metal wire passing through the second wire drawing die. The first capstan sends the metal wire non-slip to the second wire drawing die, and the first capstan control unit sets the measured second back tension to a predetermined value. As described above, the rotational torque of the first capstan may be controlled.

  According to a third aspect of the present invention, there is provided a wire drawing method for reducing the diameter of a metal wire by passing a wire drawing die and drawing the metal wire, wherein the metal passes through the wire drawing die. A step of controlling a back tension of the wire; a step of using a capstan to pull the metal wire passing through the wire drawing die from the wire drawing die with a predetermined front tension in a non-slip manner; and measuring the front tension. And a step of controlling a rotational torque of the capstan based on the measured front tension.

  According to a fourth aspect of the present invention, there is provided a drawing method for drawing a metal wire by reducing the diameter of the metal wire by passing a wire drawing die, wherein the metal passes through the wire drawing die. A step of controlling a back tension of the wire, a step of using a capstan to pull out the metal wire passing through the wire drawing die from the wire drawing die in a non-slip manner, and a control step of controlling the rotational torque of the capstan And the control step stores in advance a front tension of the metal wire when the capstan is rotated by speed control and the metal wire is pulled out of the wire drawing die, and the front tension is stored in the front tension. And drawing the metal wire from the first wire drawing die by controlling the rotational torque of the capstan based on the wire drawing method. To provide.

It is a mimetic diagram showing the composition of wire drawing machine 100 concerning one embodiment of the present invention. It is a block diagram which shows the structure of the control unit 200 which controls the wire drawing machine.

  Hereinafter, the present invention will be described through embodiments of the invention with reference to the drawings. However, the following embodiments do not limit the invention according to the claims, and are described in the embodiments. Not all combinations of features are essential to the solution of the invention.

(Configuration of the wire drawing machine 100)
FIG. 1 is a schematic diagram showing a configuration of a wire drawing machine 100 according to an embodiment of the present invention. FIG. 2 is a block diagram showing a configuration of a control unit 200 that controls the wire drawing machine 100 according to the embodiment.

  In this embodiment, the wire drawing machine 100 includes a housing 12, an unwinding unit 20, wire drawing units 40 and 90, a winding unit 60, and a control unit 200 that controls each unit. . In the wire drawing machine 100, from the upstream side to the downstream side (from left to right in FIG. 1) along a path (hereinafter referred to as “passing path”) in which the metal wire 10 is fed out, drawn and wound. The unwinding unit 20, the wire drawing units 40 and 90, and the winding unit 60 are provided in order. Then, the wire drawing machine 100 draws the metal wire 10 sent out from the unwinding unit 20 in each wire drawing unit 40 and 90 while reducing the diameter in order, and drawing the drawn metal wire 10. Winding is performed in the winding unit 60.

  The control unit 200 controls the operation of the wire drawing machine 100. The control unit 200 includes a system controller 110, an unwinding unit controller 120, a wire drawing unit controller 140, and a winding unit controller 160. The system controller 110 is connected to the unwinding unit controller 120, the wire drawing unit controller 140, and the winding unit controller 160, and comprehensively controls each unit controller.

  The unwinding unit controller 120, the wire drawing unit controller 140, and the winding unit controller 160 are connected to various configurations provided in the unwinding unit 20, the wire drawing units 40 and 90, and the winding unit 60, respectively. Control each unit. In FIG. 2, only one wire drawing unit controller 140 is shown. However, the wire drawing unit controller 140 includes n-stage (n is a positive integer) wire drawing units 40-1 to n and 90. Is provided.

  Thus, the system controller 110, the unwinding unit controller 120, the wire drawing unit controller 140, and the winding unit controller 160 provided in the control unit 200 are the unwinding unit 20, the wire drawing unit 40, and the winding unit. 60 is controlled, the metal wire 10 is sent out from the unwinding unit 20, drawn through the wire drawing units 40-1 to n and 90, and wound up in the winding unit 60.

  Based on FIG.1 and FIG.2, each structure of the wire drawing machine 100 is demonstrated. In the present embodiment, as shown in FIG. 1, the n-stage wire drawing unit 40 and the wire drawing unit 90 are arranged along the path through which the metal wire 10 is sent between the unwinding unit 20 and the winding unit 60. Are provided in series so that the metal wires 10 are drawn successively. Hereinafter, each wire drawing unit 40 is called wire drawing units 40-1 to 40-n from the unwinding unit 20 toward the winding unit 60, respectively.

(Unwinding unit 20)
The unwinding unit 20 includes an unwinding bobbin 22, guide rollers 24, 26, 28 and 30, and a dancer part 32. In the unwinding unit 20, the metal wire 10 is wound around the unwinding bobbin 22, the guide roller 24, the guide roller 26, the dancer roller 34, the guide roller 26, and the guide roller 28 in a state where a predetermined tension is applied thereto. (Hereinafter referred to as “tension rack”).

  The unwinding bobbin 22 is rotatably provided on the housing 12 of the wire drawing machine 100. The unwinding bobbin 22 is connected to an unwinding motor 122 and is rotated by the drive thereof. Thereby, the metal wire 10 wound around the unwinding bobbin 22 is pulled out and sent out to the passage route. In this embodiment, the unwinding bobbin 22 is driven by the unwinding motor 122 with speed control. That is, the unwinding unit controller 120 controls the driving of the unwinding motor 122 so that the unwinding bobbin 22 rotates at a predetermined speed.

  The guide rollers 24, 26, 28 and 30 are rotatably provided on the housing 12 of the wire drawing machine 100. Each of the guide rollers 24, 26, 28, and 30 is wound a predetermined number of times so as to feed the metal wire 10 non-slip. The guide rollers 24, 26, 28 and 30 are rotated by the tension applied to the metal wire 10 by the wire drawing unit 40, and the metal wire 10 fed from the unwinding bobbin 22 is sequentially non-slip along the passage path. Send it out.

  The dancer unit 32 is configured to include a dancer roller 34, a dancer arm 36, and a torque motor 38, and applies a desired tension to the metal wire 10 fed from the unwinding bobbin 22.

  The dancer roller 34 is rotatably supported on one end side of a dancer arm 36 formed in a rod shape. The metal wire 10 is stretched in the order of a guide roller 24, a guide roller 26, a dancer roller 34, a guide roller 26, and a guide roller 28, and a predetermined tension is applied by the dancer roller 34 in a downward direction in the figure. .

  The dancer arm 36 is arranged substantially horizontally in the figure, that is, in a direction substantially perpendicular to the direction in which the tension is applied to the metal wire 10 by the dancer roller 34, and this horizontal position is used as the reference position of the dancer arm 36. The other end side of the dancer arm 36 is fixed to and 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 dancer arm 36.

  The potentiometer 138 (FIG. 2) is provided on the drive shaft of the torque motor 38 and detects the rotation angle of the dancer 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 wire drawing unit controller 140. In the present embodiment, the potentiometer 138 detects the rotation angle of the dancer arm 36, but the position and displacement of the dancer roller 34, for example, in the direction in which the dancer roller 34 applies tension to the metal wire 10, The position and displacement of the dancer roller 34 may be detected. In this case, tension may be applied to the metal wire 10 by moving the dancer roller 34 vertically (moving linearly in a direction in which tension is applied to the metal wire) without rotating the dancer roller 34.

  The torque motor 38 applies a predetermined tension to the metal wire 10 via the dancer arm 36 and the dancer roller 34. That is, the torque motor 38 transmits the rotational torque of the torque motor 38 to the metal wire 10 via the dancer arm 36 and the dancer roller 34, and applies tension to the metal wire 10. The torque motor 38 is connected to the unwinding unit controller 120 and generates a predetermined rotational torque based on a command (torque command) from the unwinding unit controller 120.

  With this configuration, the dancer unit 32 transmits a predetermined torque generated by the torque motor 38 to the metal wire 10 via the dancer arm 36 and the dancer roller 34, thereby applying a predetermined set tension to the metal wire 10. To do. That is, the tension applied to the metal wire 10 delivered from the unwinding unit 20 is determined according to the rotational torque of the torque motor 38.

  As described above, in the unwinding unit 20 in the present embodiment, the dancer portion 32 applies a predetermined tension to the metal wire 10 fed from the unwinding bobbin 22 at a constant speed, whereby the metal wire 10 is The metal wire 10 can be sent out to the wire drawing unit 40-1 with a desired tension.

(Wire drawing unit 40)
In the present embodiment, the wire drawing machine 100 includes n-stage wire drawing units 40-1 to 40 -n and a final-stage wire drawing unit 90 between the unwinding unit 20 and the winding unit 60. The The unwinding unit 20, the wire drawing units 40-1 to n and 90, and the winding unit 60 are connected to each other. And the metal wire 10 sent out from the unwinding unit 20 passes and is drawn in order of the wire drawing units 40-1, 40-2, ... 40-n, 90. The metal wire 10 drawn in the drawing unit 90 is sent out to the winding unit 60. In the present embodiment, the wire drawing units 40-1 to 40-n have the same configuration. Therefore, unless the wire drawing units 40-1 to 40-n are individually specified, the wire drawing units 40-1 to 40-n are hereinafter referred to. This will be collectively referred to as “drawing unit 40”. Similarly, each configuration included in the wire drawing units 40-1 to 40-n will be described generically in the same manner.

  The wire drawing unit 40 includes a wire drawing die 42, guide rollers 44 and 46, and a drive capstan 50. In the wire drawing unit 40, the metal wire 10 is stretched across the guide roller 44, the wire drawing die 42, the guide roller 46, and the drive capstan 50.

  The wire drawing die 42 is provided between the guide roller 44 and the guide roller 46. The wire drawing die 42 has a die hole in a direction in which the metal wire 10 is stretched. When the metal wire 10 passes through the die hole and is pulled out, the diameter of the metal wire 10 is reduced, and the metal wire 10 10 is drawn. At this time, the reduction rate of the diameter of the metal wire 10 (the reduction rate of the cross-sectional area) is determined according to the diameter of the die hole provided in the wire drawing die 42, and the metal wire 10 is drawn according to the reduction rate. Is done. The diameter of the die hole of each stage of the wire drawing dies 42 of the wire drawing units 40-1 to 40-n is such that the metal wire 10 drawn in the wire drawing unit 40-n which is the final wire drawing unit has a desired wire diameter. It chooses suitably so that it may become.

  In the present embodiment, the wire drawing units 40-1 to 40-n gradually reduce the diameter of the metal wire 10 that passes therethrough. Accordingly, the diameter of the die hole provided in the wire drawing die 42-n is smaller than the die hole provided in the wire drawing die 42-1. Moreover, the diameter of the die hole provided in the wire drawing die 42-1 is smaller than the die hole provided in the wire drawing die 42-1.

  In the present embodiment, the wire drawing die 42 is stored in a die holder fixed to the housing 12. The wire drawing machine 100 may have means for measuring a drawing force when the metal wire 10 is drawn from the wire drawing die 42 and drawn. The means may be, for example, a means for measuring the drawing force by detecting the force with which the wire drawing die 42 presses the die holder, or detecting the distortion of the die holder fixed to the housing 12. It may be a means for measuring the drawing force.

  In addition, if the metal wire 10 and / or the wire drawing die 42 are immersed in the lubricating oil, the metal wire 10 passing through the wire drawing die 42 can be prevented from shaking and the stability thereof can be improved. For this reason, you may provide the oil tank for immersing the metal wire 10 and / or the wire drawing die 42 in lubricating oil. For example, an oil tank may be disposed between the wire drawing 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 overflows from the oil tank during the wire drawing operation. Further, the wire drawing die 42 may be arranged in the oil tank, and the oil tank may be arranged so that the metal wire 10 penetrates in the vertical or horizontal direction. However, a seal is required for the penetrating portion.

  The following advantages are obtained by immersing the metal wire 10 and / or the wire drawing die 42 in the lubricating oil. Lubricating oil optimal for the wire drawing performed in the wire drawing dies 42 in each wire drawing unit 40 can be used. The composition of the lubricating oil has a great influence on the wear of the wire drawing die 42. However, by having such a configuration, it becomes possible to stably supply the lubricating oil having a composition specialized for wire drawing. . In addition, a lubricating oil circulation and purification system was necessary to reduce the influence of dirt on the lubricating oil due to the friction between the metal wire 10 and the drive capstan 50, but the circulation and purification system can be simplified, Production costs can be reduced.

  The guide rollers 44 and 46 are rotatably provided on the housing 12 of the wire drawing machine 100. The guide rollers 44 and 46 are respectively provided with strain gauges 152 and 156 and encoders 154 and 158 (see FIG. 2) on their shaft portions.

  The strain gauges 152 and 156 detect the strain of the guide rollers 44 and 46, respectively, and detect the tension of the metal wire 10. That is, the metal wire 10 stretched in the wire drawing machine 100 has a predetermined tension at each location, and the strain gauge 152 detects the strain of the guide roller 44 and passes through the wire drawing die 42. The tension of the previous metal wire 10 (hereinafter referred to as “front tension”) is detected. The strain gauge 156 detects the strain of the guide roller 46 and detects the tension (hereinafter referred to as “back tension”) of the metal wire 10 after passing through the wire drawing die 42. Specifically, the strain gauge 152 (156) includes the tension of the metal wire 10 in the direction in which the metal wire 10 is fed when entering the guide roller 44 (46), and the metal wire 10 is guided to the guide roller 44 (46). The resultant force with the tension of the metal wire 10 in the direction sent when exiting is detected as the strain.

  The encoders 154 and 158 detect the rotation speed of the guide rollers 44 and 46, respectively, and detect the speed at which the metal wire 10 is sent out. 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 sent out in front of the wire drawing die 42. The encoder 158 detects the number of rotations of the guide roller 46 and detects the speed at which the metal wire 10 is fed behind the wire drawing die 42.

  The drive capstan 50 is rotatably provided on the housing 12 of the wire drawing machine 100. The drive capstan 50 is connected to a drive motor 150 (see FIG. 2), and rotates with a predetermined torque based on a command from the wire drawing unit controller 140. The drive capstan 50 draws the metal wire 10 from the wire drawing die 42 by the rotational torque, and sends the drawn metal wire 10 to the wire drawing unit 40 or the wire drawing unit 90 in the next stage.

  The outer peripheral surface of the drive capstan 50 is sprayed to increase its surface hardness and increase durability, and between the surface of the drive capstan 50 (contact surface with the metal wire 10) and the metal wire 10. To prevent slippage. Further, the outer peripheral surface of the drive capstan 50 may be covered with an elastic body (for example, resin such as urethane or rubber) having a large friction coefficient. In this way, the metal cap 10 is pulled out of the wire drawing die 42 in a non-slip manner by the surface-treated drive capstan 50 and sent out to the next stage.

(Wire drawing unit 90)
The wire drawing unit 90 includes a wire drawing die 92, guide rollers 94 and 96, and a drive capstan 98. In the wire drawing unit 90, the metal wire 10 is stretched across the guide roller 94, the wire drawing die 92, the guide roller 96, and the drive capstan 98.

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

  The wire drawing die 92 has substantially the same or similar configuration as the wire drawing die 42 of the wire drawing unit 40 except that it has a function of appropriately adjusting (adding or reducing) the stress and strain of the metal wire 10. Specifically, the wire drawing die 92 is provided so that the angle of the central axis of the die hole can be freely adjusted with respect to the direction in which the metal wire 10 is pulled out. The wire drawing 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. Thereby, the metal wire 10 can be straightened or curled as necessary. Moreover, since the axial direction of the die hole can be adjusted according to the drawing direction of the metal wire 10, uneven wear of the die can be suppressed.

(Winding unit 60)
The winding unit 60 includes guide rollers 66, 68 and 70, a dancer unit 72, and a winding bobbin 80. In the winding unit 60, the metal wire 10 is stretched in the order of a guide roller 66, a dancer roller 74, guide rollers 66, 68 and 70, and a winding bobbin 80.

  The guide rollers 66, 68 and 70 are rotatably provided on the housing 12 of the wire drawing machine 100. Each of the guide rollers 66, 68 and 70 is wound a predetermined number of times so as to feed the metal wire 10 non-slip. 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, and the metal wire 10 drawn by the wire drawing unit 90 is non-slip along the passage path. Send out sequentially.

  The dancer unit 72 includes a dancer roller 74, a dancer arm 76, and a torque motor 78, and applies a desired tension to the metal wire 10 drawn in the wire drawing unit 90.

  The dancer roller 74 is rotatably supported on one end side of a dancer arm 76 formed in a rod shape. The metal wire 10 is stretched in the order of a guide roller 66, a dancer roller 74, a guide roller 66, a guide roller 68, and a guide roller 70, and a predetermined tension is applied by the dancer roller 74 in a downward direction in the figure. .

  The dancer arm 76 is arranged substantially horizontally in the drawing, that is, in a direction substantially perpendicular to the direction in which the tension is applied to the metal wire 10 by the dancer roller 74, and this horizontal position is used as the reference position of the dancer arm 76. The other end side of the dancer arm 76 is fixed to and 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 dancer arm 76.

  The potentiometer 178 (FIG. 2) is provided on the drive shaft of the torque motor 78 and detects the rotation angle of the dancer 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 via the dancer arm 76 and the dancer roller 74. That is, the torque motor 78 transmits the rotational torque of the torque motor 78 to the metal wire 10 via the dancer arm 76 and the dancer roller 74, and applies tension to the metal wire 10. The torque motor 78 is connected to the winding unit controller 160 and generates a predetermined rotational torque based on a command (torque command) from the winding unit controller 160.

  The winding bobbin 80 is rotatably provided on the housing 12 of the wire drawing machine 100. The take-up bobbin 80 is connected to a take-up motor 180 and is rotated by the drive thereof. Thereby, the metal wire 10 drawn in the wire drawing unit 90 and the take-up bobbin 80 are wound up. In the present embodiment, the winding bobbin 80 is driven by the 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 rotational speed of the winding motor 180 based on the rotational speed of the drive capstan 98 and the rotation angle of the dancer arm 76.

  As described above, in the winding unit 60 in the present embodiment, the winding bobbin 80 applies the predetermined tension to the metal wire 10 sent out from the wire drawing unit 90 by the dancer unit 72, and the metal wire 10 at a constant speed. Is winding up.

(Drawing operation of the drawing machine 100)
Next, an operation in which the wire drawing machine 100 configured as described above draws the metal wire 10 will be described with reference to FIGS. 1 and 2. In the following example, among the n-stage drawing units 40, the back tension of the metal wire 10 drawn by the drawing dies 42 of the i-th drawing unit 40 is BTi, the front tension is FTi, Let CTi be the rotational torque of the drive capstan 50 (i is a positive integer less than or equal to n).

(First embodiment)
In the first embodiment, the metal wire 10 is drawn by controlling the rotational torque of the drive capstan 50 based on the front tension of the metal wire 10 in each wire drawing unit 40. Specifically, after the metal wire 10 is stretched over the components of the unwinding unit 20, the wire drawing unit 40, and the winding unit 60, each component is controlled as follows to draw the metal wire 10.

(Operation of unwinding unit 20)
First, the unwinding unit 20 sends the metal wire 10 from the unwinding unit 20 at a substantially constant speed. In other words, the unwinding unit controller 120 has a drive capstan whose speed at which the metal wire 10 is sent out from the unwinding unit 20 (hereinafter, the speed at which the metal wire 10 is sent at each position in the passage path is referred to as “linear speed”). The number of revolutions of the unwinding motor 122 is controlled so as to be maintained at a substantially constant speed according to the speed at which the metal wire 10 is fed from 90.

  In this embodiment, the unwinding unit controller 120 controls the rotation speed of the unwinding motor 122 using the linear velocity of the metal wire 10 in the guide roller 44 as a feedforward signal and the rotation angle of the dancer arm 36 as a feedback signal. Specifically, the speed at which the metal wire 10 is sent out from the unwinding unit 20, that is, the linear speed of the metal wire 10 passing through the guide roller 44 is detected by the encoder 154 provided on the guide roller 44, and the wire drawing unit It is supplied to the controller 140. Then, the unwinding unit controller 120 supplies the speed signal indicating the linear speed as a feedforward signal to the unwinding motor 122 to control the rotation of the unwinding motor 122.

  On the other hand, when the dancer arm 36 rotates and a predetermined tension is applied to the metal wire 10 sent out from the unwinding bobbin 22, the linear velocity of the metal wire 10 sent out from the unwinding bobbin 22 and the guide roller A predetermined error occurs between the linear velocity of the metal wire 10 passing through 44. The unwinding unit controller 120 generates a feedback signal based on the rotation angle detected by the potentiometer 138, controls the rotation of the unwinding motor 122, corrects the deviation of the linear velocity due to the error, and unwinds the unwinding unit. The linear velocity of the metal wire 10 delivered from 20 is maintained substantially constant.

  Specifically, the unwinding unit controller 120 calculates a rotation angle deviation between the rotation angle of the dancer arm 36 detected by the potentiometer 138 and the rotation angle when the dancer arm 36 is at the reference position. Then, the unwinding unit controller 120 determines the rotational speed of the unwinding motor 22 so that the rotation angle deviation approaches zero, and supplies a rotational speed command based on the rotational speed command to the unwinding motor 122. The unwinding unit controller 120 controls the rotational speed of the unwinding motor 22 by using, for example, P control, PI control, PID control, or the like, using the rotation angle deviation as a feedback signal.

  In order to feed the metal wire 10 wound around the unwinding bobbin 22 at a constant speed, it is necessary to control the rotation speed of the unwinding bobbin 22 according to the winding diameter of the metal wire 10 wound around the unwinding bobbin 22. At a certain point, the unwinding unit 20 maintains the linear velocity of the metal wire 10 delivered from the unwinding unit 20 by the above operation so that the metal wire 10 has a preset tension. A predetermined tension is applied. The tension becomes the back tension BT1 of the metal wire 10 passing through the wire drawing die 42-1. For example, the unwinding unit controller 120 controls the unwinding unit 20 to apply a predetermined tension to the metal wire 10 so that BT1 becomes about 10% of the yield stress of the metal wire 10 wound on the unwinding bobbin 22. Is granted.

  In the present embodiment, the unwinding unit controller 120 controls the rotation angle of the dancer arm 36 while controlling the rotation speed of the unwinding motor 122 to maintain the linear velocity of the metal wire 10 to be substantially constant. Although a predetermined tension is applied to the wire 10, the unwinding unit controller 120 is configured to control the rotational speed and / or rotational torque of the unwinding motor 122 without providing the dancer portion 32. Ten tensions and / or linear velocities may be controlled. Thereby, in the wire drawing machine 100, the number of the dancer parts 32 can further be reduced.

  Further, in the unwinding unit 20, for example, a strain gauge or the like may be provided on the guide roller 28 or 30, and the tension of the metal wire 10 may be measured. In this case, the unwinding unit controller 120 may feedback control the rotational torque of the torque motor 38 using the difference between the set tension and the tension measured by the strain gauge as a feedback signal. Thereby, a predetermined tension can be applied to the metal wire 10 so that the tension of the metal wire 10 is closer to the set tension.

(Operation of the wire drawing unit 40)
Next, the operation in which each wire drawing unit 40 draws the metal wire 10 sent out from the unwinding unit 20 will be described.

The first-stage wire drawing unit 40-1 controls the rotational torque CT1 of the drive capstan 50-1 based on the front tension FT1 of the metal wire 10 passing through the wire drawing die 42-1. To draw. Specifically, the rotational torque CT1 of the drive capstan 50-1 includes the front tension FT1 of the metal wire 10 passing through the wire drawing die 42-1, and the wire drawing die of the second stage wire drawing unit 40-2. It has the following relationship with the back tension BT2 of the metal wire 10 passing through 42-1.

CT1 = FT1-BT2

Therefore, if the first stage front tension FT1 can be measured, the first stage rotational torque CT1 can be controlled, and the second stage back tension BT2 can be controlled to a predetermined value. In this embodiment, the wire drawing unit controller 140 determines that the second stage of the back tension BT2 is based on the front tension FT1 of the metal wire 10 measured by the strain gauge 156 provided on the guide roller 46-1. The rotational torque CT1 of the drive capstan 50-1 is controlled so as to be a value. That is, the wire drawing unit controller 140 performs feedforward control of the rotational torque CT1 based on the front tension FT1. As a result, the metal wire 10 is pulled out from the wire drawing die 42-1 by the driving capstan 50-1 with the pulling force of the front tension FT1 in a non-slip manner and with the back tension BT2 applied. It is sent non-slip to 40-2. For example, the back tension BT2 is about 10% of the yield stress of the metal wire drawn from the wire drawing die 42-1.

The second-stage wire drawing unit 40-2 further draws the metal wire 10 in the same manner as the first-stage wire drawing unit 40-1. That is, the wire drawing unit controller 140 sets the third stage back tension BT3 to a predetermined value based on the front tension FT2 of the metal wire 10 measured by the strain gauge 156 provided on the guide roller 46-2. As described above, the rotational torque CT2 of the drive capstan 50-2 is controlled.

CT2 = FT2-BT3

Similarly, the wire drawing unit controller 140 is based on the front tension FTi of the metal wire 10 measured by the strain gauge 156 provided in the guide roller 46-i in the i-th wire drawing unit 40-i. The rotational torque CTi of the drive capstan 50n is controlled so that the third stage of the back tension BTi + 1 becomes a predetermined value.

CT (i) = FT (i) −BT (i + 1)

As a result, the metal wire 10 is pulled out from the wire drawing die 42i by the driving capstan 50i by the pulling force of the front tension FTi in a non-slip manner, and with the back tension BTi + 1 applied, the wire drawing unit 40i + 1 (or the wire drawing unit). Non-slip to the line unit 90). In the above equation, when i = n, the back tension of the metal wire 10 drawn by the wire drawing die 92 of the wire drawing unit 90 is BT (i + 1).

  In this embodiment, the wire drawing unit controller 140 controls the rotational torque CT of the drive capstan 50 using the back tension BTi + 1 as a set value, but measures both the front tension FTi and the back tension BTi + 1. The rotational torque CT of the drive capstan 50 may be controlled. Alternatively, the drawing force DT may be measured at each wire drawing die 42 to control the rotational torque CT of the drive capstan 50. Thereby, the drawing force in the wire drawing die 42 can be measured during the wire drawing operation.

According to this embodiment, the drive capstan 50 sets the back tension BTi + 1 of the next stage based on the actually measured front tension FTi. That is, in this embodiment, since the front tension is actually measured at each stage, an error (difference between the set value of the back tension and the actual value) generated in the back tension of the stage is the front tension (or Subsequent back tension and front tension) are not taken over and accumulated. Further, the cause of the error between the back tension set value and the actual value is merely a mechanical error in the drive capstan 50. Therefore, according to the present embodiment, it is possible to provide a wire drawing machine in which an error between the set value of the back tension and the actual value is extremely small.

(Operation of the wire drawing unit 90)
Next, an operation in which the wire drawing unit 90 draws the metal wire 10 sent out from the wire drawing unit 40-n will be described. In the following, the operation of the wire drawing unit 90 will be described focusing on differences from the operation of the wire drawing unit 40.

  The wire drawing unit 90 appropriately adjusts the stress and strain of the metal wire 10 drawn in the wire drawing unit 40-n, and determines the wire speed at which the metal wire 10 is sent to the winding unit 60.

  Specifically, first, the metal wire 10 drawn by the wire drawing die 42-n of the wire drawing unit 40-n is fed out particularly when the area reduction rate of the wire drawing die is large. Stress or strain is perpendicular to the direction. The wire drawing die 92 applies a drawing force to the metal wire 10 more uniformly than the wire drawing die 42-n from the periphery thereof, and appropriately adjusts such stress or strain.

  Further, the drive capstan 98 determines the linear velocity of the metal wire 10 in the wire drawing machine 100. That is, the wire drawing unit controller 140 supplies a rotational speed command to the drive motor 198 so that the linear speed of the metal wire 10 becomes a preset speed, and controls the rotation of the drive motor 198. The drive motor 198 controls the rotation speed of the drive capstan 98 based on the command. For example, the wire drawing unit controller 140 controls the rotation speed of the drive capstan 98 so that the linear velocity at which the metal wire 10 is sent to the winding unit 60 is 1000 m / min.

  The wire drawing unit controller 140 measures the linear velocity of the metal wire 10 fed from the drive capstan 98 based on the number of rotations of the guide roller 96 detected by the encoder 158 provided on the guide roller 96. Then, the rotational speed of the drive motor 198 may be feedback controlled using the linear velocity as a feedback signal.

  According to the present embodiment, the torque of the drive capstan 50 of the wire drawing unit 40 is controlled, and the speed of the drive capstan 98 of the wire drawing unit 90 is controlled. Both the linear velocities of the line 10 can be made more stable.

(Operation of winding unit 60)
The winding unit 60 winds the metal wire 10 so that the wire speed of the metal wire 10 fed from the unwinding unit 20 and drawn in each wire drawing unit 40 is substantially constant. That is, the winding unit controller 160 controls the rotation speed of the winding motor 180 so that the linear velocity of the metal wire 10 supplied to the winding unit 60 is maintained substantially constant.

  In the present embodiment, the winding unit controller 160 uses, for example, the rotational speed of the drive capstan 98 in the previous stage of the winding unit 60, that is, the linear velocity of the metal wire 10 as a feedforward signal, and the rotation angle of the dancer arm 76. Is used as a feedback signal to control the rotation speed of the winding motor 180. Specifically, the linear velocity of the metal wire 10 passing through the drive capstan 98 is detected by an encoder provided in the drive capstan 98 and supplied to the wire drawing unit controller 140. Then, the winding unit controller 160 supplies a speed signal indicating the linear velocity as a feedforward 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 calculates a rotation angle deviation between the rotation angle of the dancer arm 76 detected by the potentiometer 178 and the rotation angle when the dancer arm 76 is at the reference position. The winding unit controller 160 determines the rotational speed of the winding motor 180 so that the rotation angle deviation approaches zero, and supplies a rotational speed command based on the rotational speed command to the winding motor 180. The winding unit controller 160 controls the rotational speed of the winding motor 180 by using the rotation angle deviation as a feedback signal, for example, by control such as P control, PI control, and PID control.

  The winding unit 60 performs the above operation, regardless of the winding amount of the metal wire 10 that has already been wound on the winding bobbin 80, and the linear velocity of the metal wire 10 sent out from the wire drawing unit 40-n (that is, The linear velocity of the metal wire 10 in the drive capstan 98) is maintained substantially constant, and on the other hand, no deviation occurs between the linear velocity and the linear velocity of the metal wire 10 passing through the guide rollers 68 and 70. The metal wire 10 can be wound on the winding bobbin 80.

  With the above operation, the wire drawing machine 100 can draw the metal wire 10 wound around the unwinding bobbin 22 at the wire drawing units 40 and 90 and wind it up at the winding bobbin 80. For example, the wire drawing machine 100 has a 5-stage wire drawing unit 40 (that is, n = 5), the metal wire 10 wound around the unwinding bobbin 22 is a piano wire having a diameter of 120 μm, and 5 wire drawing units. When the wire dies 42 have die hole diameters of 111 μm, 102 μm, 94 μm, 87 μm, and 80 μm, respectively, the diameter of the metal wire 10 wound on the winding bobbin 80 is 80 μm.

(Second embodiment)
In the second embodiment, the front tension value (hereinafter referred to as “sample value”) of the metal wire 10 measured when the drive capstan 50 is rotated by speed control in each wire drawing unit 40 is acquired in advance. Based on this, the drive capstan 50 is rotated not by speed control but by torque control, and the metal wire 10 is pulled out from the wire drawing die 42 and drawn.

  In the wire drawing machine 100, first, the metal wire 10 is stretched around each wire drawing unit 40 before performing the wire drawing operation. In the present embodiment, in each wire drawing unit 40, the tip end portion of the metal wire 10 is thinned and passed through the die hole of the wire drawing die 42, and then the drive capstan 50 is rotated by speed control so that the metal wire 10 Is pulled out of the wire drawing die 42 and wound around the drive capstan 50 for a predetermined length (hereinafter referred to as “device operation”). In the present embodiment, during the setting operation, the wire wire is operated with the front tension of the metal wire 10 when the metal wire 10 is pulled out of the wire drawing die 42 by speed control as the sample value FT ′ of the front tension. .

(Device operation)
In the present embodiment, first, after the metal wire 10 is stretched in the unwinding unit 20, the metal wire 10 is connected to the guide roller 44-1, the wire drawing die 42-1, and the guide roller 46 in the wire drawing unit 40-1. Stretch to -1. The wire drawing unit controller 140 rotates the drive capstan 50-1 at a substantially constant speed by speed control, and winds the metal wire 10 around the drive capstan 50-1 for a predetermined length (or a fixed time). . At this time, the wire drawing unit controller 140 stores the front tension FT1 of the metal wire 10 detected by the strain gauge 156 provided on the guide roller 46 as the sample value FT1 ′ of the front tension FT1. FT1 ′ may be an instantaneous value or an average value of the front tension FT1.

  Similarly, also in the wire drawing units 40-2 and C, the wire drawing unit controller 140 acquires and stores the sample values FT2 'and FT3' of the front tensions FT2 and FT3 of the metal wire 10.

  Next, in this embodiment, an operation in which the wire drawing machine 100 draws the metal wire 10 will be described. In this embodiment, since the unwinding unit 20, the wire drawing unit 90, and the winding unit 60 operate in the same manner as in the first embodiment, the operation of the wire drawing unit 40 will be described below.

(Operation of the wire drawing unit 40)
The first-stage wire drawing unit 40-1 draws the metal wire 10 by controlling the rotational torque CT1 of the drive capstan 50-1 based on the sample value FT1 ′ of the front tension FT1 acquired in advance. To do. In the present embodiment, FT1 ′ is a sample value acquired in a state where the set value BT1 is added as the back tension of the metal wire 10. Accordingly, the sample value DT1 ′ of the drawing force of the wire drawing die 42-1 can be calculated based on the following.

DT1 '= FT1'-BT1

The rotational torque CT1 of the drive capstan 50-1 passes through the front tension FT1 of the metal wire 10 passing through the wire drawing die 42-1, and the wire drawing die 42-1 of the second stage wire drawing unit 40-2. It has the following relationship with the back tension BT2 of the metal wire 10 to be performed.

CT1 = FT1-BT2

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

FT1 = BT1 + DT1

Therefore, in this embodiment, the rotational torque CT1 of the drive capstan 50-1 is as follows based on the back tensions BT1 and BT2 (both set values) and the drawing force DT1 ′ (sample value).

CT1 = BT1 + DT1′−BT2

  In the present embodiment, the wire drawing unit controller 140 uses the above formula so that the back tension BT2 becomes a predetermined value based on the set value of the back tension BT1 and the sample value DT1 ′ of the drawing force obtained in advance. The feed torque is controlled for the rotational torque CT1 of the drive capstan 50-1. As a result, the metal wire 10 is pulled out from the wire drawing die 42-1 by the drive capstan 50-1 with the pulling force of FT1 ′ in a non-slip manner, and in a state where the back tension BT2 is applied in the setting. Non-slip is sent to the line unit 40-2.

Similarly to the first-stage wire drawing unit 40-1, the second-stage wire drawing unit 40-2 uses the following formula to set the set value of the back tension BT2 and the sample value DT2 ′ of the drawing force obtained in advance. Based on this, the feed-forward control of the rotational torque CT2 of the drive capstan 50-2 is performed so that the back tension BT3 becomes a predetermined value.

CT2 = BT2 + DT2'-BT3

Similarly, the wire drawing unit controller 140 sets the back tension BTi + 1 to a predetermined value based on the set value of the i-th stage back tension BTi and the sample value DTi ′ of the drawing force obtained in advance by the following equation. In this way, the rotational torque CTi of the drive capstan 50i is feedforward controlled.

CT (i) = BT (i) + DT (i) ′ − BT (i + 1)

As a result, the metal wire 10 is pulled out of the wire drawing die 42i by the driving capstan 50i by the pulling force of FTi ′ in a non-slip manner, and in a state where the back tension BTi + 1 is applied, the wire drawing unit 40i + 1 ( Or, it is fed non-slip to the wire drawing unit 90). In the above equation, when i = n, the back tension of the metal wire 10 drawn by the wire drawing die 92 of the wire drawing unit 90 is BTi + 1.

  In this embodiment, in the wire drawing operation, DT1 ′ is a sample value of the drawing force, that is, since the drawing force is not actually measured in the wire drawing operation, it is temporarily wound around the drive capstan 50. Even if the metal wire 10 is loosened, DT1 ′ does not change. Therefore, in this embodiment, it is preferable that the wire drawing machine 100 further has a configuration for pressing the metal wire 10 wound around the drive capstan 50 against the drive capstan 50. The pressing structure may be, for example, a roller.

  In the present embodiment, the value of the front tension during the setting operation is acquired as a sample value, but the method of acquiring the sample value is not limited to this.

  According to the present embodiment, the rotational torque CT of the drive capstan 50 is controlled by the sample value, and it is not necessary to have a configuration for actually measuring the front tension, the back tension, etc. in the wire drawing operation. Can be provided. Further, according to the present embodiment, the rotational torque CT of the drive capstan 50 is controlled by the sample value, and the rotational torque CT of the drive capstan 50 does not fluctuate due to disturbance. Can be provided.

(Third embodiment)
In the third embodiment, in addition to the second embodiment, the back tension BT of the metal wire 10 is further measured. In this embodiment, the rotational torque of the drive capstan 50 at a predetermined stage is feedforward controlled based on the front tension FT at the same stage and the back tension BT at the next stage. In this embodiment, feedback control is performed so that the measured back tension BT becomes a predetermined value.

  Hereinafter, in this embodiment, the operation of the wire drawing machine 100 drawing the metal wire 10 will be described. In this embodiment, the unwinding unit 20, the wire drawing unit 90, and the winding unit 60 are the same as those in the first embodiment. Since the sample value is acquired in the same manner as in the second embodiment, the operation of the wire drawing unit 40 during the wire drawing operation will be described below.

(Operation of the wire drawing unit 40)
The first-stage wire drawing unit 40-1 draws the metal wire 10 by controlling the rotational torque CT1 of the drive capstan 50-1 based on the sample value FT1 ′ of the front tension FT1 acquired in advance. To do. In the present embodiment, FT1 ′ is a sample value acquired in a state where the measured value BT1 ′ is added as the back tension of the metal wire 10. Accordingly, the sample value DT1 ′ of the drawing force of the wire 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 drive capstan 50-1 passes through the front tension FT1 of the metal wire 10 passing through the wire drawing die 42-1, and the wire drawing die 42-1 of the second stage wire drawing unit 40-2. It has the following relationship with the back tension BT2 of the metal wire 10 to be performed.

CT1 = FT1-BT2

The wire drawing unit controller 140 feedback-controls the rotational torque CT1 of the drive capstan 50-1 using the above equation. That is, the wire drawing unit controller 140 controls the rotational torque CT1 of the drive capstan 50-1 so that the measured value of the back tension BT2 approaches the set value.

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

FT1 = BT1 + DT1

In the present embodiment, the rotational torque of the drive capstan 50-1 is further feedforward controlled, and the feedforward amount CT1 ′ is determined by the back tensions BT1 and BT2 (both set values) and the drawing force DT1 ′ (sample). Based on the value):

CT1 ′ = BT1 (set value) + DT1 ′ (sample value) −BT2 (set value)

In the present embodiment, the wire drawing unit controller 140 uses the above formula so that the back tension BT2 becomes a predetermined value based on the set value of the back tension BT1 and the sample value DT1 ′ of the drawing force obtained in advance. The feed torque is controlled for the rotational torque CT1 of the drive capstan 50-1. As a result, the metal wire 10 is pulled out from the wire drawing die 42-1 by the drive capstan 50-1 with the pulling force of FT1 ′ in a non-slip manner, and in a state where the back tension BT2 is applied in the setting. Non-slip is sent to the line unit 40-2.

Similarly to the first-stage wire drawing unit 40-1, the second-stage wire drawing unit 40-2 uses the following formula to set the set value of the back tension BT2 and the sample value DT2 ′ of the drawing force obtained in advance. Based on this, the feed-forward control of the rotational torque CT2 of the drive capstan 50-2 is performed so that the back tension BT3 becomes a predetermined value.

CT2 = BT2 + DT2'-BT3

Similarly, the wire drawing unit controller 140 sets the back tension BTi + 1 to a predetermined value based on the set value of the i-th stage back tension BTi and the sample value DTi ′ of the drawing force obtained in advance by the following equation. In this way, the rotational torque CTi of the drive capstan 50i is feedforward controlled.

CT (i) = BT (i) + DT (i) ′ − BT (i + 1)

As a result, the metal wire 10 is pulled out of the wire drawing die 42i by the driving capstan 50i by the pulling force of FTi ′ in a non-slip manner, and in a state where the back tension BTi + 1 is applied, the wire drawing unit 40i + 1 ( Or, it is fed non-slip to the wire drawing unit 90). In the above equation, when i = n, the back tension of the metal wire 10 drawn by the wire drawing die 92 of the wire drawing unit 90 is BTi + 1.

  According to the present embodiment, since the back tension of the metal wire 10 is feedback-controlled, an error between the drawing force and the sample value of the front tension and the actual value becomes the back tension of the next stage as in the first embodiment. It can be prevented from being taken over and accumulated. In this embodiment, since the back tension is measured, the drawing force of the wire drawing die 42 can be calculated based on the measured back tension and the rotational torque of the drive capstan 50.

  According to the wire drawing machine and the wire drawing method described above, since it is not necessary to provide a dancer in the wire drawing unit, the configuration can be simplified. In addition, it is possible to provide a wire drawing machine capable of arbitrarily adjusting the wire drawing processing conditions such that the back tension and the metal wire area reduction ratio can be arbitrarily set. Therefore, according to the wire drawing machine and the wire drawing method of the present embodiment, the back tension can be arbitrarily set to reduce the wear of the wire drawing dies, and the surface reduction rate can be arbitrarily set to draw. Excellent effects such as reduction in the number of dice used can be achieved. Furthermore, according to the wire drawing machine and the wire drawing method of the present embodiment, the wire drawing conditions such as the wire drawing speed, back tension, and front tension can be arbitrarily adjusted. It is possible to create a metal wire having excellent characteristics such as breaking load and tensile strength as compared with conventional metal wires.

  The examples and application examples described through the embodiments of the present invention can be used in combination as appropriate according to the application, or can be used with modifications or improvements, and the present invention is limited to the description of the above-described embodiments. It is not a thing. It is apparent from the description of the scope of claims that the embodiments added with such combinations or changes or improvements can be included in the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 10 ... Metal wire, 11 ... Metal wire, 20 ... Unwinding unit, 22 ... Unwinding bobbin, 22 ... Unwinding motor, 24, 26, 28 ... Guide roller, 32 ... Dancer part, 34 ... Dancer roller, 36 ... Dancer arm, 38 ... Torque motor, 40 ... Drawing unit, 42 ... Drawing die, 44,46 ... Guide roller, 50 ... Drive capstan, 60 ... Winding unit, 66, 68, 70 ... Guide roller, 72 ... Dancer section, 74 ... Dancer roller, 76 ... Dancer arm, 78 ... Torque motor, 80 ... winding bobbin, 92 ... wire drawing dies, 94, 96 ... guide rollers, 98 ... drive capstan, 100 ... wire drawing machine, 110 ... system controller 120 ... Unwinding unit Controller, 122 ... Unwinding motor, 138 ... Potentiometer, 140 ... Wire drawing unit controller, 150 ... Drive motor, 152, 156 ... Strain gauge, 154, 158 ... Encoder, 160 ... winding unit controller, 178 ... potentiometer, 180 ... winding motor, 200 ... control unit, BT ... back tension, CT ... rotational torque, DT ... drawing force , FT ... Front tension

Claims (4)

A first wire drawing die for reducing the diameter of the metal wire passing therethrough and drawing the metal wire;
A back tension control unit for controlling a first back tension of the metal wire passing through the first wire drawing die;
A first capstan that non-slips the metal wire passing through the first wire drawing die from the first wire drawing die;
A first capstan controller that controls rotational torque of the first capstan and pulls the metal wire out of the first wire drawing die;
A winding portion for winding the drawn metal wire,
The first capstan control unit includes:
The first front tension of the metal wire when the first capstan is rotated by speed control and the metal wire is pulled out from the first wire drawing die is stored in advance.
A wire drawing machine that pulls out the metal wire from the first wire drawing die by controlling the rotational torque of the first capstan based on the first front tension.   The first capstan control unit rotates an average of the first capstan when the first capstan is rotated by a speed control for a predetermined period and the metal wire is pulled out from the first wire drawing die. The wire drawing machine according to claim 1, wherein torque is stored as the first front tension. The metal wire provided between the first capstan and the winding portion passes through the metal wire pulled out by the first capstan, and the diameter of the metal wire that has passed is reduced to reduce the metal wire. A second drawing die for drawing,
A back tension measuring unit for measuring a second back tension of the metal wire passing through the second wire drawing die;
The first capstan sends the metal wire to the second wire drawing die non-slip,
The wire drawing machine according to claim 1, wherein the first capstan control unit controls a rotational torque of the first capstan so that the measured second back tension becomes a predetermined value. A wire drawing method for reducing the diameter of a metal wire by passing a wire drawing die and drawing the metal wire,
Controlling the back tension of the metal wire passing through the wire drawing die;
Using a capstan, the step of pulling the metal wire passing through the wire drawing die from the wire drawing die in a non-slip manner;
A control step for controlling the rotational torque of the capstan,
The control step includes
Storing the front tension of the metal wire in advance when the capstan is rotated by speed control and the metal wire is pulled out of the wire drawing die;
And drawing a metal wire from the first wire drawing die by controlling a rotational torque of the capstan based on the front tension.

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