JP2008188626A - Apparatus and method for drawing extra fine wire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus for drawing a wire with which the breaking of the wire is prevented by reducing the vibration of the wire which is generated by reason that the ratio of the wire speed to the outer peripheral speed of a capstan on the inlet side of the wire is substantially different from that on the outlet side. <P>SOLUTION: In the apparatus for drawing the extra fine wire which is provided with an unwinding spool 2 for unwinding the wire 1 which is worked into a prescribed diameter and wound on a bobbin in the preceding stage to a wire drawing part A, a pair of cylindrical driving capstans 8, 9 and guiding capstans 6, 7, a plurality of dies 5 which are arranged between the capstans and a winding spool 10 for winding the drawn wire 1 by passing through the dies 5, two stages of large-diameter capstans 7, 9 and small-diameter capstans 6, 8 are made by changing the respective diameters of the guiding capstans 6, 7 and the driving capstans 8, 9 in the process and the capstans on the outlet side C of the wire are taken as the large-diameter capstans and the capstans on the inlet side B of the wire as the small-diameter capstans. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  In the process of drawing an IC wire with a cylindrical capstan using a slip-type wire drawing device, the present invention provides a ratio between the wire speed of the wire at the wire drawing portion and the outer peripheral speed of the capstan (hereinafter, this ratio is expressed as “ The wire speed ratio on the wire entry side (the wire is closer to the “unwinding spool”) at the wire drawing section is sometimes set to a wire outlet. It is inevitable that it will be caused by a large difference from the linear speed ratio on the side (the side where the wire is close to the “take-up spool”). By reducing the vibration of the wire on the wire entrance side, The present invention relates to an extra fine wire drawing apparatus and an extra fine wire drawing method for preventing disconnection.

  Conventionally, in order to draw an extra fine wire such as an IC wire, the wire 1 fed from the unwinding spool 2 is conveyed by a cylindrical drive capstan 14 and a guide capstan 15 as shown in FIG. The diameters are successively reduced by the dies 5 arranged between the capstans 14 and 15.

  The capstan in the slip-type wire drawing method is used as an auxiliary to the tension of the wire winding portion, and the outer peripheral speed is generally set faster than the wire speed of the wire traveling in the die. There is always a constant slip between the wire and the wire. Further, the outer peripheral speeds of the drive capstan and the guide capstan are operated in consideration of the fact that each time the wire passes through the die, the area is reduced and drawn.

  The outer peripheral speed of the generally used cylindrical capstan is set by setting a certain slip ratio to the wire drawing speed at the outlet side of the wire drawing part, so that it decreases at the wire inlet side part of the wire drawing part. Since the surface ratio is not yet drawn by the power of the die, the ratio of the outer peripheral speed of the capstan to the wire speed (wire speed ratio) increases, the slip becomes excessive, and the wire vibrates vigorously. As a result, there is a problem that the wire is disconnected from the pulley near the wire entrance side of the wire drawing portion, or the wire is shaken at the entrance of the die to cause disconnection.

On the other hand, as shown in Patent Document 1, some capstans have a stepped capstan in order to adapt the diameter of the capstan contacting the wire to the linear velocity, but this method uses a capstan for each die. Since the diameter of the stun is changed, the difference in capstan diameter between the wire inlet side and the outlet side becomes large, and long capstans cannot be used due to restrictions such as strength and wire drawing size. If you do not match the hole diameter of the die with the stepped capstan, the tension will increase and it will be easier to disconnect, and the diameter of each step will change, making it difficult to finish the capstan surface. there were.
JP 2003-53418 A

  The present invention has been made to solve such problems, and the object of the present invention is in a drawing process of ultrafine wires such as a gold wire by a slip-type wire drawing apparatus using a cylindrical capstan. In particular, by reducing the ratio of the outer peripheral speed of the capstan to the wire speed on the inlet side of the wire drawing part (wire speed ratio) and reducing the vibration of the wire, the wire from the pulley near the inlet side of the wire drawing part An extra fine wire drawing apparatus and an extra fine wire drawing method that prevent wire breakage caused by wire wobbling at the die entrance and improve the operating rate of the wire drawing device are provided. That is.

  In order to achieve the above object, an extra fine wire drawing apparatus of the present invention includes a winding spool that unwinds a wire that has been processed into a predetermined wire diameter and wound on a bobbin in a previous step, and a pair of wires. In a micro-wire drawing apparatus comprising a cylindrical drive capstan and guide capstan, a plurality of dies disposed therebetween, and a winding spool for winding a wire drawn through the dies. The diameter of the capstan and drive capstan is changed in the middle to make two stages of large diameter capstan and small diameter capstan, the wire exit side capstan is the large diameter capstan, and the wire entrance side capstan is the small diameter capstan. It is what.

  And in another aspect of the present invention, in addition to the above-mentioned invention, the number of wires after the die passes in contact with the large diameter drive capstan on the wire outlet side and the number of wires in contact with the small diameter drive capstan on the wire inlet side When the dies are arranged so that the number is the same, and the outer peripheral speed of the large-diameter drive capstan on the wire exit side is matched to the winding speed of the wire after passing the final die, the outer peripheral speed of the small-diameter drive capstan on the wire inlet side However, the diameter of the small-diameter drive capstan is set so as to be equal to the linear velocity of the wire after passing through the die at the intermediate position in the total die.

  Another aspect of the present invention is that, in addition to the above-described invention, when the outer peripheral speed of the large-diameter drive capstan on the wire outlet side is matched with the winding speed of the wire after passing through the final die, the small-diameter drive cap on the wire inlet side. The diameter of the small-diameter drive capstan is set so that the outer peripheral speed of the stan is equal to the linear velocity of the wire after passing through the final die in the die in contact with the small-diameter drive capstan on the wire entrance side.

  According to still another aspect of the present invention, in addition to the above-described invention, the wire speed ratio of the wire to the guide capstan or the drive capstan is set to 3.0 or less.

  In addition, the method of drawing an ultrafine wire according to the present invention includes an unwinding spool for unwinding a wire that has been processed into a predetermined wire diameter and wound on a bobbin in a previous process, and a pair of cylindrical drive caps. When drawing a wire using an ultra-fine wire drawing device including a stun and a guide capstan, a plurality of dies arranged therebetween, and a winding spool for winding the wire drawn through the dies, The guide capstan and the drive capstan are changed in diameter in the middle to make two stages, a large diameter capstan and a small diameter capstan, the wire outlet side capstan is a large diameter capstan, and the wire inlet side capstan is a small diameter capstan. A stun is used so that the drawing speed ratio during drawing is always 3.0 or less.

  According to the present invention, since the diameter of the guide capstan and the drive capstan in the wire drawing apparatus is set to two stages, the linear speed ratio can be kept below a certain level, and as a result, the vibration of the wire can be reduced. It is possible to prevent the wire from coming off from the pulley on the inlet side of the wire drawing portion or the wire breakage due to the wire runout at the die inlet, and it is possible to improve the product yield and the productivity.

  Embodiments of the present invention will be described with reference to the illustrated examples. FIG. 1 is a schematic perspective view showing an example in which the diameters of the guide capstan and the drive capstan in the apparatus for drawing a wire of the present invention are two steps. FIG. 2 is a schematic perspective view of the wire drawing portion of FIG. FIG. 3 is an enlarged explanatory view of a capstan and a die portion. FIG. 4 shows the linear velocity ratio between the case where the diameters of the guide capstan and the drive capstan in the extra-fine wire drawing apparatus of the present invention are two steps and the case where the conventional cylindrical guide capstan and drive capstan are used. It is a comparison table.

  The ultra-fine wire drawing apparatus of the present invention includes an unwinding spool 2 for unwinding the wire 1 to a wire drawing portion A and an unwinding spool 2 from a bobbin around which the wire 1 processed into a predetermined wire diameter in the previous step is wound. A brake 3 for applying a braking force, a pulley 4 for guiding the wire 1 on the inside and outside of the wire drawing portion A, a pulley 4 'for guiding the wire 1 on the outlet side, and the wire 1 is drawn out from the spool 2 and drawn. However, it is constituted by a take-up spool 10 that takes up the wire after drawing.

  Further, the wire drawing portion A includes a die 5 for drawing the wire 1, a small diameter guide capstan 6 that is positioned in front of the die 5 with respect to the traveling direction of the wire 1, and feeds the wire 1 into the die 5, and a small diameter guide cap Same as the large diameter guide capstan 7 attached to the tip of the same shaft as the stan 6, the small diameter drive capstan 8 that is positioned behind the die 5 and pulls the wire 1 from the die 5, and the small diameter drive capstan 8 And a large-diameter drive capstan 9 attached to the tip of the shaft.

  That is, the capstan on the wire inlet side B near the unwinding spool 2 of the wire drawing portion A is composed of a small diameter guide capstan 6 and a driving capstan 8 provided on the same axis, and the wire outlet side C near the winding spool 10. The capstan is composed of a large-diameter guide capstan 7 and a drive capstan 9, each of which is provided in two stages on the same shaft. The small-diameter capstans 6 and 8 and the large-diameter capstans 7 and 9 have the dice 5 arranged so that the number of wires 1 that contact each other is basically the same.

  When the outer peripheral speed of the large-diameter drive capstan 9 on the wire outlet side C is matched with the winding speed of the wire 1 after passing through the final die, the outer peripheral speed of the small-diameter drive capstan 7 on the wire inlet side B is the intermediate position. The diameter ratio and number of the dies 5 and the diameters of the small diameter capstans 6 and 8 and the large diameter capstans 7 and 9 are appropriately selected so as to be equal to the wire speed of the wire after passing through the dies. However, the number of wires 1 and the number of dies 5 that are in contact with each other between the small-diameter guide capstan 6 and the large-diameter guide capstan 7 and between the small-diameter drive capstan 8 and the large-diameter drive capstan 9 must always be the same. As will be described later, the linear velocity ratio should be 3.0 or less.

  In order to drive them, a take-up motor 11 that rotates the take-up spool 10 that pulls out the wire 1 at a constant outer peripheral speed, a linear actuator 12 that traverses the take-up spool 10 left and right, and a guide capstan 6, 7 and a capstan motor 13 that drives the drive capstans 8 and 9 via a belt.

Next, the operation of the above-described extra fine wire drawing apparatus of the present invention will be described.
When the take-up motor 11 is operated, the take-up spool 10 attached thereto rotates. Then, the wire 1 travels so as to be wound around the take-up spool 10 and travels through the wire drawing portion A, and the wire 1 wound around the take-up spool 2 is fed out to the wire drawing portion A while being braked by the brake 3. It is. At the same time, the capstan motor 13 is also operated to rotate the guide capstans 6 and 7 and the drive capstans 8 and 9 at an outer peripheral speed faster than the wire speed of the wire, and assist the traveling of the wire 1 by the frictional force. In this way, the wire 1 sequentially passes through the dice 5, and the wire diameter is sequentially reduced from the larger machining hole formed in the dice 5 toward the finished diameter.

  And the length of the wire 1 becomes long by reducing a wire diameter sequentially. That is, it is drawn. Here, the outer peripheral speed of the large-diameter drive capstan 9 on the wire outlet side is made substantially equal to the linear speed of the wire 1 after passing through the final die 5. Therefore, the length of the wire 1 is shortened as it goes to the wire entrance side because the wire 1 is not drawn as much as the passing number of the dies 5 is small. That is, the linear velocity ratio increases as it goes to the wire entrance side.

Next, an example of a two-stage capstan having a linear velocity ratio of 3.0 or less will be described with reference to FIGS. 3 and 4.
In FIG. 3, the hole diameter ratio between the dies is 0.9, and the total number of dies is 20. Here, each die is moved from the wire inlet side B of the wire drawing part A toward the wire outlet side C. 1-No. Let's call it 20. No. 1-No. The wire 1 that has passed through the die 10 is in contact with the small-diameter drive capstan 8, 11-No. The wire 1 that has passed through the 20 dies is in contact with the large-diameter drive capstan 9.

  As shown in FIG. 1-No. No. 20 when the hole diameter ratio between the dies of 20 is set to 0.9. 11 to No. The reduction ratio of 20 dies is 0.35. Therefore, no. When the diameter of the large-diameter drive capstan 9 is set so that the linear velocity ratio of the large-diameter drive capstan 9 to 1 is 1, No. 20 for the large-diameter drive capstan 9 is set. The wire speed ratio of the wire 1 after 11 passes becomes 2.86 which is the reciprocal of the reduction ratio 0.35. Similarly, no. No. 1 The reduction ratio of 10 dies is 0.35. And No. When the diameter of the small-diameter drive capstan 8 is set so that the linear speed ratio with respect to the small-diameter drive capstan 8 is 1, No. 10 for the small-diameter drive capstan 8 is set. The wire speed ratio of the wire 1 after one pass is also 2.86, which is the reciprocal of the reduction ratio 0.35. Therefore, the linear speed ratio is always 3.0 or less. That is, no. By making the diameter from 10 smaller, no. The diameter of the small diameter drive capstan 8 is set so that the linear velocity ratio at 10 becomes 1 again.

  On the other hand, in the case of the conventional example shown in FIG. 5, as shown in the conventional method of FIG. 4, 20 dies having a hole diameter ratio of 0.9, a conventional cylindrical capstan 14 having the same diameter (large diameter drive capstan). No. 9 with the same diameter) No. 1 The reduction ratio of 20 dies is 0.135. Therefore, no. When the linear velocity ratio of the drive capstan 14 to 20 is set to 1, No. 20 for the drive capstan 14 is set. The wire speed ratio of the wire 1 after passing 1 is 7.4 which is the reciprocal of the reduction ratio 0.135. Thus, by making the capstan into a two-stage type as in the present invention, the linear speed ratio is reduced and the vibration of the wire is also reduced as compared with the conventional case. The same effect can be obtained for the guide capstans 6 and 7.

  According to the method in which the diameters of the guide capstan and the drive capstan in the extra-fine wire drawing device of the present invention are set to two stages, the vibration of the wire is reduced, the wire is detached from the pulley on the inlet side of the drawn portion, or the die inlet Disconnection due to wire wobbling can be prevented, and the length of the capstan can be freely selected, so that the number of dies can be freely set, and the use range is extremely wide.

It is a schematic perspective view which shows one Embodiment which makes the diameter of a guide capstan and a drive capstan in the apparatus which draws the wire of this invention into 2 steps | paragraphs. It is a schematic perspective view of the wire drawing part of FIG. It is expansion explanatory drawing of a capstan and a die part. Comparison table of linear velocity ratio between the case where the diameter of the guide capstan and the drive capstan in the extra fine wire drawing apparatus of the present invention is two-stage and the case where the conventional cylindrical guide capstan and the drive capstan are used It is. It is a schematic perspective view of the apparatus using the conventional guide capstan and drive capstan.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Wire 2 Unwinding spool 3 Brake 4 Pulley 5 Die 6 Small diameter guide capstan 7 Large diameter guide capstan 8 Small diameter drive capstan 9 Large diameter drive capstan 10 Winding spool 11 Winding motor 12 Direct acting actuator 13 Capstan motor A Wire drawing part B Wire inlet side C Wire outlet side

Claims (5)

  A wire spool that has been processed into a predetermined wire diameter and wound on a bobbin in the previous step, and a pair of cylindrical drive capstans and guide capstans that unwinds the wire to a wire drawing portion, and a plurality of them disposed therebetween. In an ultra-fine wire drawing device equipped with a die and a take-up spool for winding the wire drawn through the die, the diameter of each of the guide capstan and the drive capstan is changed halfway to An ultra-thin wire drawing device characterized in that a stun and a small diameter capstan have two stages, the wire outlet side capstan is a large diameter capstan, and the wire inlet side capstan is a small diameter capstan.   The dice are arranged so that the number of wires that contact the large-diameter drive capstan on the wire outlet side and the number of wires that contact the small-diameter drive capstan on the wire inlet side are the same number after passing through the die. When the outer peripheral speed of the large-diameter drive capstan is matched to the winding speed of the wire after passing through the final die, the outer peripheral speed of the small-diameter drive capstan on the wire entrance side is the wire after passing through the middle die. 2. The ultrafine wire drawing apparatus according to claim 1, wherein the diameter of the small-diameter drive capstan is set so as to be equal to the linear velocity.   When the outer peripheral speed of the large-diameter drive capstan on the wire outlet side is matched to the winding speed of the wire after passing through the final die, the outer peripheral speed of the small-diameter drive capstan on the wire inlet side becomes the small-diameter drive capstan on the wire inlet side. The ultra-thin wire drawing apparatus according to claim 1, wherein the diameter of the small-diameter drive capstan is set so as to be equal to the wire speed of the wire after passing through the final die in the contacting die.   The extra fine wire drawing apparatus according to any one of claims 1 to 3, wherein a wire speed ratio of the wire to the guide capstan or the drive capstan is 3.0 or less.   A wire spool that has been processed into a predetermined wire diameter and wound on a bobbin in the previous step, and a pair of cylindrical drive capstans and guide capstans that unwinds the wire to a wire drawing portion, and a plurality of them disposed therebetween. When drawing a wire using an ultrafine wire drawing device equipped with a die and a take-up spool for winding the wire drawn through the die, the diameters of the guide capstan and the drive capstan are set in the middle. To change it into two stages, a large diameter capstan and a small diameter capstan, the wire exit side capstan is a large diameter capstan, the wire entrance side capstan is a small diameter capstan, and the wire speed ratio during wire drawing is always 3 An extra fine wire drawing method, characterized in that the value is 0.0 or less.

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