JPH09315685A - Extra fine wire manufacturing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To heighten wire drawing speed by forming a V-shape groove for guiding a wire, in a guide capstan. SOLUTION: A metal wire 8 is delivered from a bus-line bobbin 7 and drawn by a die 6 through a guide capstan rotated in assocition with the rotation of a driving capstan 4. A final finished wire is obtained by a finishing die 9 via a guide roller 11 and wound around a finishing bobbin 10, and the wound end part is fixed. A V-shape groove 12 is formed in the guide capstan 5, and the passing wire 8 is all constrained by the V-shape groove 12. Drawing of extra fine wire can thereby performed at high speed without being influenced by lubricant.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal wire drawing machine for smoothly manufacturing an ultrafine wire such as a bonding wire used for connecting an electrode on a semiconductor element and an external lead. is there.

[0002]

2. Description of the Related Art Conventionally, in order to manufacture a fine gold wire for connecting an electrode of a semiconductor element such as an IC or LSI and an external lead, a large diameter raw material wire is thinned by a single-cylinder wire drawing machine or the like. The wire drawing machine 1 shown in FIGS. 3 and 4 is used to further thin the wire to obtain an ultrafine wire having a predetermined diameter. This wire drawing machine 1 has a lubricant 2
A drive capstan 4 and a guide capstan 5 are installed inside a tank 3 filled with the above-mentioned liquid, and a plurality of dies 6 each having a smaller diameter are arranged between the capstans 4 and 5.

The driving capstan 4, while the gold wire 8 drawn from the busbar bobbin 7 is inserted through these dies 6.
Wind the guide capstan 5 around it, and then raise it to 9
And is fixed to the ascending wire bobbin 10, and the driving capstan 4, the guide capstan 5 and the ascending wire bobbin 10 are rotationally driven to run the gold wire, and the diameter is successively reduced by the die 6. ing.

Drive capstan 4, guide capstan 5
The driving speed of the drive capstan 4 is designed to be slightly faster, but since the gold wire 8 is gradually reduced in diameter each time it passes through the die 6, the drive capstan 4 is prevented from loosening. The traveling speed is set so that each of the guide capstans 5 and the gold wire slip with each other.

[0005]

By the way, in the production of the gold wire 8 by the wire drawing machine 1, when the wire drawing is performed at a high speed of 300 to 800 m / min, the drive capstan 4 and the guide capstan 5 are formed. In the above, the phenomenon of lubricating oil entrainment occurs and the lubricant 2 enters between the capstan and the gold wire 8 to cause slippage, and as the wire diameter becomes smaller, the gold wire 8 sways left and right due to the flow of the lubricant 2. Become. Further, the gold wire 8 is easily lifted by the lubricant that has entered between the guide capstan 5 and the gold wire 8. As a result, the gold wire 8 is broken during the process, and the gold wire 8 after drawing is raised and the die 9
To the guide roller 11 easily, and because the angle at which the wire is introduced to the rising die 9 is not constant, inconveniences such as twisting and fine breaking of the gold wire occur, and the wire drawing speed is increased. I couldn't. In particular, this phenomenon was remarkable between the final die of die 6 and the rising die 9.

Therefore, in order to solve this problem, the lubricant 8
Measures such as using a shower method instead of the method of dipping into the oil, or making the lubricant itself low-viscosity have been taken, but it has not been a sufficient solution.

The present invention has been made in order to solve the problems in the production of the above-mentioned conventional ultrafine wire, and increases the wire drawing speed without causing disconnection or other inconvenience due to the influence of the lubricant during operation. The purpose of this is to develop an ultrafine wire drawing machine that can be used.

[0008]

DISCLOSURE OF THE INVENTION The present invention for solving the above-mentioned problems is achieved by a group of wire drawing dies arranged between a pair of drive capstans and a guide capstan, and by passing the wire drawing dies. A fine wire drawing machine provided with a winding bobbin for winding drawn fine wire, characterized by an extra-fine wire manufacturing apparatus having a V-shaped groove for guiding the wire in a guide capstan. . In the present invention, the V-shaped groove formed in the guide capstan has a V opening angle of 9
0 ° or less, the bottom has a radius of curvature within 2 to 10 times the wire diameter, and the groove depth is 30 to 5 of the wire diameter.
It is preferably 0 times.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Since the wire drawing machine of the present invention is provided with the V-shaped guide groove having a rounded bottom in the guide capstan as described above, it is introduced into the guide capstan after passing through the die group. The position of the wound wire is fixed without the thin wire coming off the V-shaped guide groove, and the guide roll of the die is moved to the predetermined position with certainty, so that problems such as disconnection do not occur. .

In the present invention, the angle of the V-shaped groove in which the guide capstan is formed is set to 90 ° or less. When the angle is larger than 90 °, the line is likely to crawl up the V-shaped groove. The smaller the angle, the better, but the lower limit is about 60 ° from the diameter of the wire to be drawn. Further, the radius of curvature of the rounded portion at the bottom of the V-shaped guide groove is set to 2 to 10 times the wire diameter. If the wire diameter is less than 2 times, the wire is easily entangled, and if it exceeds 10 times, the wire swings and the desired diameter is obtained. This is because the position fixing effect cannot be obtained. Further, the depth of the V-shaped guide groove is set to be 30 to 50 times the wire diameter because the wire is likely to be entangled if it is smaller than 30 times, and the groove angle is formed to be 90 ° or less if it exceeds 50 times. Because it will be difficult.

Next, the case where a gold ultrafine wire is obtained by the wire drawing machine of the present invention will be described with reference to the drawings. In FIG. 1, a gold wire 8 from a die 6 is attached to a guide capstan 5 of the wire drawing machine.
Is introduced straightly, and a V-shaped groove 12 having a shape as shown in the enlarged sectional view of FIG. 2 is provided so as to be fed straight into the guide roller 11l. The other reference numerals in the figure are the same as those shown in FIGS. 3 and 4, and therefore the description thereof is omitted here.

In order to draw a gold wire with the wire drawing machine of the present invention, the gold wire 8 is unwound from the busbar bobbin 7 and is guided in the drive capstan 4 by the rotation of the drive capstan. 5, the wire is drawn in a die 6, and this is repeated for a plurality of dies 6. After that, a final finishing line is obtained in a die 9 which goes up through a guide roller 11 and an end portion is wound around a bobbin 10. Fix it. This series of operations is performed by a drive device (not shown) provided on the drive capstan, and the gold wire 8 is
The diameter is reduced after each die, and a fine gold wire having a target wire diameter is obtained in the rising die 11.

Further, in the present invention, since the V-shaped groove 12 is formed in the guide capstan 5, all the lines 8 passing through the guide capstan are constrained by the V-shaped groove 12, so that it is extended. Even when the linear velocity is increased, the line 8 does not shift to the left or right due to the inclusion of the lubricant 2, and the line 8 from the guide capstan 5 can be surely introduced into a predetermined position without coming off from the guide roller 11. it can. Further, since the guide capstan 5 does not cause the entanglement due to the lifting of the wire 8 due to the entrainment of the lubricant 2, no inconvenience such as disconnection occurred during the operation.

The V-shaped groove 12 in the guide capstan 5 does not necessarily have to be formed on the surface facing all the dies 6, but it is essential to form at least the introduction surface to the guide roller 11.

[0015]

Next, an embodiment of the present invention will be described. FIG.
36 μm as a bus bar using the wire drawing machine according to the present invention shown in
When a φ gold wire (1 kg / bobbin) 8 is drawn, the V-shaped opening angle is 90 ° only on the facing surface of the rising die 9 that is introduced into the guide roller 11, the radius of curvature of the bottom is 0.03 mm, and the depth is 1 mm. Guide capstan 5 with V-shaped groove 12
When an ultrafine gold wire having a wire diameter of 25 μmφ was drawn at a drawing speed of 400 m / min by using, the wire breakage trouble occurs due to the gold wire 8 getting entangled in the guide capstan 5 or coming off the guide roller 11. I was able to operate smoothly without any problems.

On the other hand, with the conventional wire drawing machine shown in FIG. 2, the same gold wire was used and the wire drawing speed was 25 μm.
When the gold wire 8 of mφ was drawn, it was 5 per bobbin.
-10 times, problems occurred due to wire breakage due to the entanglement of the gold wire 8 with the guide capstan 5 and disconnection from the guide roller 11, making it impossible to perform efficient operation.

[0017]

According to the wire drawing machine of the present invention, the movement of the wire is prevented by forming the V-shaped groove in the guide capstan, so that the ultra-fine wire can be operated at a high speed without being affected by the lubricant. Since wire drawing can be performed and continuous operation can be performed without trouble such as disconnection, productivity can be remarkably improved.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view of a wire drawing machine of the present invention.

FIG. 2 is a partially enlarged cross-sectional view of the guide capstan portion of FIG.

FIG. 3 is a schematic front view of a conventional wire drawing machine.

FIG. 4 is a plan view of FIG. 3;

[Explanation of symbols]

 1 Wire drawing machine 2 Lubricant 3 Lubricant tank 4 Drive capstan 5 Guide capstan 6 Dies and 7 Busbar bobbin 8 Gold wire 9 Climbing die 10 Climbing bobbin 11 Guide roller

Claims (2)

[Claims] 1. A wire drawing die group arranged between a pair of drive capstans and a guide capstan, and a winding bobbin for winding an ultrafine wire drawn by passing through the wire drawing die group. In the thin wire drawing machine described above, a V-shaped groove for guiding the wire is formed in the guide capstan, which is an extra-fine wire manufacturing apparatus. 2. The V-shaped groove has a rounded bottom with a radius of curvature within 2 to 10 times the wire diameter, and an opening angle of V of 9
0 ° or less, the bottom has a radius of curvature within 2 to 10 times the wire diameter, and the groove depth is 30 to 5 of the wire diameter.
The extra-fine wire manufacturing apparatus according to claim 1, wherein the number is 0 times.