JP2756191B2 - Wire drawing method and wire drawing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire drawing method and a wire drawing machine.

[0002]

2. Description of the Related Art Generally, a wire drawing machine arranges a plurality of capstans and a plurality of drawing dies alternately, and sequentially passes a wire to be drawn into a wire finished to a desired diameter. The wire is drawn. Such a wire drawing machine usually supplies a lubricating liquid to a wire drawing die to improve the slip of a wire passing therethrough. There are two types of capstans: a wet type that improves sliding and a dry type that does not use a lubricant. Generally, the lubricating liquid has the same concentration on the bus side and on the finished side. That is, although the lubricating oil tank is divided from one lubricating oil tank, the drawing conditions are generally such that the lubricating oil concentration is preferably lower as the wire diameter becomes smaller. Therefore, when the lubricating oil concentration is adjusted to the busbar side (thick side) mainly with a large diameter wire rod, the drawing force is small on the finished side, so the concentration is too high and the drawing force is increased. Also, because of the high speed, the lubricating oil drawing in the finished die becomes too high, and the surface condition of the wire becomes poor. On the other hand, if the density is adjusted to the finished side, not only the lubrication is insufficient in the bus-side die but also the capstan wear becomes a problem due to the large drawing force. In the case of a thin wire, in the case of a wet-type wire drawing machine, if the lubricating oil concentration is adjusted to the bus bar side, the concentration is too high on the finished side, and the wire is likely to be entangled with the capstan, causing wire breakage. And the concentration is too high, which leads to an increase in the pulling force. On the other hand, if the density is adjusted to the finish side, the lubrication is insufficient on the bus side, which leads to disconnection and an increase in pulling force.

[0003]

The present invention, as a result of studying the above problems, has developed a wire drawing method and a wire drawing machine having good wire drawability.

[0004]

[0005]

An embodiment of the present invention will be described below. Embodiment 1 FIGS. 1 and 2 are schematic diagrams of a wire drawing method and a wire drawing machine showing an example of the present invention, wherein 1 is a wire drawing machine, and 2 is a bus bar.
In the wire drawing machine 1, four-axis capstans 3, 4, 5, and 6 are arranged. These capstans 3, 4, 5, 6
Are provided with a plurality of capstans having different diameters coaxially and in multiple stages, forming a pair with the feed capstan 3 on the bus side and the take-up capstan 4 and with the feed capstan 5 on the finish line and the take-up capstan. 6, a plurality of drawing dies 7 are arranged between the pair of capstans 3, 4, 5 and 6, respectively. Then, the wire material first passes through the wire drawing die 7 from the capstan having the smallest diameter of the feed capstan 3 on the busbar side, turns around the capstan having the smallest diameter of the capstan 4, and then the next-stage capstan of the feed capstan 3. , Passing through the next wire drawing die 7, going around the capstan next to the take-up capstan, and then going around the capstan having the maximum diameter of the feed capstan 4 and taking it through the next wire drawing die 7. The capstan 4 is fed from the capstan having the largest diameter to the feed capstan 5 on the finishing line side. Similarly, between the feed capstan 5 and the take-up capstan 6 on the finishing line side, the wire is similarly drawn sequentially through the wire drawing die 7,
The wire is wound as a wire having a desired diameter. Numeral 8 is a nozzle provided above the feed capstan 3 and take-up capstan 4 on the bus line side, the feed capstan 5 on the finish line side, and the take-up capstan 6, and capstans 3, 4, 5, 6. The lubricating liquid is sprayed toward the capstans 3, 4, 5, and 6 to smoothly slide the wire. Reference numeral 9 denotes a partition wall provided between the take-up capstan 4 and the feed capstan 5 so as to partition the inside of the wire drawing machine 1 into a busbar side and a finishing line side.
And a lubricating oil tank 12 provided separately to supply lubricating oil to the busbar side and the finishing line side. is there. Although not shown, the wire drawing die 7 is also provided with a nozzle for supplying a lubricating liquid. Using the wire drawing machine 1 configured as described above, pure copper wire was cut from 0.4 mmφ to 0.05 mm.
It was drawn to mmφ. The drawing speed is 2000 m / min,
The lubricating oil concentration was 1.5% on the bus side and 0.7% on the finish. In this way, the die wear during the drawing, the amount of generated copper powder was measured, and the surface of the drawn material was observed. Further, the concentration of the lubricating oil on the busbar side and the finish was made the same in the conventional method, and the wire was drawn under the same conditions. Table 1 shows the results.

[0006]

[Table 1]

As is clear from Table 1, the inventive sample No. 1 produces less copper powder during wire drawing than the conventional example No. 2, and the finished wire surface condition is excellent. Conventional example No. 3
It can be seen that the die condition, the generated copper powder and the surface condition of the wire are more excellent. Example 2 The wire drawing machine shown in FIG. 2 was used to dry the capstans 3, 4, 5, and 6 without spraying lubricating oil, supplying lubricating oil only to the die 7, and reducing the pure copper wire from 0.05 mmφ to 0 mm. 0.030mm
Wire drawn to φ. The drawing speed was 1000 m / min, and the lubricating oil concentration was 0.7% on the busbar side and 0.3% on the finish. And
The die wear during wire drawing, the amount of generated copper powder, the surface observation, and the amount of wire drawn per wire break were measured and compared with the conventional method. Table 2 shows the results. For the amount of copper powder, the amount of copper powder adhered to the felt 11 installed between the die 7 and the take-off capstans 4 and 6 was observed.

[0008]

[Table 2]

As is clear from Table 2, Example No. 1 of the present invention produced less copper powder during wire drawing than the conventional example No. 2, had a good finished wire surface condition, and had an excellent wire drawing amount per disconnection. Recognize. In addition, it can be seen that the die wear, the generated copper powder, the surface condition of the wire, and the amount of elongation per disconnection are superior to Conventional Example No. 3. Although the embodiments of the present invention have been described above, the embodiments can be appropriately modified within the scope of the present invention. For example, the number of capstans of a wire drawing machine may be arbitrarily arranged horizontally or vertically, such as 6 axes or 8 axes. The concentration of the lubricating oil may be determined for each pair of shafts, and the concentration of the lubricating oil may be appropriately selected according to the wire diameter. Further, the combination of the lubricating oil supply to the capstan and the lubricating oil supply to the die can be selected according to the wire diameter, the drawing speed, and the like. The effect does not change even if the wire drawing material is a copper alloy wire, a steel wire, a stainless steel wire, a plated wire, a composite wire, or the like.

[0010]

As described above, according to the present invention, it is possible to perform wire drawing with good drawability and excellent quality, and it has an industrially remarkable effect.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a wire drawing method and a wire drawing machine according to one embodiment of the present invention.

FIG. 2 is a schematic diagram of another drawing method and a drawing machine according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Wire drawing machine 2 Busbar 3, 4, 5, 6 Capstan 7 Dice

Continuation of the front page (56) References JP-A-58-25811 (JP, A) JP-A-60-9865 (JP, A) JP-A-3-90211 (JP, A) (58) Fields investigated (Int .Cl. ⁶ , DB name) B21C 9/00 B21C 1/00

Claims (2)

(57) [Claims] 1. A wire drawing method in which a wire is sequentially passed through a plurality of drawing dies and a plurality of capstans to draw wire, wherein the concentration of the lubricating fluid on the finishing wire side of the wire is lower than the concentration of the lubricating fluid on the busbar side. A wire drawing method characterized by doing. 2. A drawing machine for sequentially drawing a wire through a plurality of drawing dies and a plurality of capstans, and a tank for supplying lubricating oil to the capstan and / or the drawing dies on the busbar side and a finishing line. And a tank for supplying lubricating oil to a side capstan and / or a drawing die.