JP2819319B2 - High purity aluminum wire drawing method - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for drawing a high-purity aluminum wire, and particularly to a high-purity aluminum wire capable of easily obtaining an aluminum wire to which an appropriate amount of oil has adhered by drawing. And a wire drawing method.

2. Description of the Related Art The quality requirements of high-purity aluminum wires used for electrolytic capacitor terminals include, in addition to general physical characteristics, no scratches, no aluminum powder, and no oil. Has become.

However, among them, there is no oil adhesion,
When processing high-purity aluminum wires into terminals, it is necessary that a small amount of oil adhere to such a degree that scratches and aluminum powder do not occur due to friction between the aluminum wires or contact with guide rolls. .

The amount of oil attached to an aluminum wire generally increases as the viscosity of the lubricating oil at the time of wire drawing increases.However, such as a high-purity aluminum wire for the terminal of an electrolytic capacitor, the thickness is 0.6 to 1.5.
If high-viscosity lubricating oil is applied to a wire drawn as thin as about mm, the aluminum wire will easily become entangled with the capstan of the wire drawing machine during wire drawing (particularly at startup), making wire drawing difficult. Become.

For this reason, a low-viscosity lubricating oil is usually used for drawing a high-purity aluminum wire. When low-viscosity lubricating oil is used, if the wire is drawn using a normal finished capstan, there is almost no oil attached to the drawn aluminum wire surface, and the finished capstan and guide rolls cause scratches. In order to avoid this, wire drawing is performed without using a finished capstan.

Problems to be Solved by the Invention However, according to the above-described drawing method, a large amount of oil adheres to the drawn aluminum wire. For this reason, conventionally, a cleaning step was provided separately from the wire drawing step, and the aluminum wire was washed after the wire drawing, and an adjustment to reduce the attached oil to a predetermined amount was required. Therefore, productivity at the time of drawing a high-purity aluminum wire is low, and there is a problem in production cost.

An object of the present invention is to provide an aluminum wire to which an appropriate amount of oil is adhered by wire drawing by adjusting the amount of oil to be attached when drawing a high-purity aluminum wire in view of the above-described current situation. It is an object of the present invention to provide a method for drawing a high-purity aluminum wire.

Means for Solving the Problems The above object is achieved by the method for drawing a high-purity aluminum wire according to the present invention. In summary, the present invention provides a method of drawing a high-purity aluminum wire by inserting a wire of a high-purity aluminum wire through an intermediate die and a finished die to which lubricating oil has been supplied. Divided into two second finishing dies and installed, two lubricating oils of low viscosity are supplied to the first finishing die, and the second finishing die is positioned downstream of the first finishing die. Is a method for drawing a high-purity aluminum wire, characterized by supplying a high-viscosity lubricating oil.

Examples Hereinafter, examples of the present invention will be described in detail.

FIG. 1 is an explanatory view showing one embodiment of the wire drawing method of the present invention.

As shown in FIG. 1, a pair of intermediate capstans 4, 4 are installed in a box-shaped wire drawing machine main body 3 at intervals in the horizontal direction. An intermediate die 1 for drawing a high-purity aluminum wire 1 to an intermediate diameter is provided. The wire drawing machine body 3 is filled with the lubricating oil 5 up to above the intermediate die 1, whereby the intermediate die 1 is filled.
The lubricating oil 5 is supplied to the intermediate capstans 4 and 4. As the lubricating oil 5, a low-viscosity lubricating oil is used.

The high-purity aluminum wire 1 is supplied from the supply reel 6 on the upstream side of the wire drawing machine main body 3 into the wire drawing machine main body 3, wrapped around the intermediate capstans 4, 4, and then passed through the intermediate die 1. The wire is drawn by the intermediate die 1 to a predetermined intermediate diameter.

According to the present invention, the finished die for drawing the element wire l of a high-purity aluminum wire drawn to an intermediate diameter by the intermediate die 1 to a predetermined final diameter is divided into two, and the first and second dies are divided into two. Are provided as finished dies 13 and 14. In the present embodiment, the first
Finished die 13 at the exit of the wire 1 in the wire drawing machine main body 3 as it is, and a second die 13 downstream of the first finished die 13
The finishing dies 14 are respectively housed in the box-shaped housing 7 of the small room at the outlet of the strand 1 outside the wire drawing machine main body 3 and installed.

The housing 7 is filled with the lubricating oil 8 up to the second finished die 14, whereby the lubricating oil 8 is supplied to the finished die 14. As the lubricating oil 8 supplied to the second finishing die 14, it is preferable to use a high-viscosity lubricating oil in order to easily increase the amount of lubricating oil adhering to the strand l. The low-viscosity lubricating oil 5 is supplied to the first finished die 13 as in the case of the intermediate die 1 and the like.

The high-purity aluminum wire l drawn to an intermediate diameter by the intermediate die 1 is a first finished die at the outlet inside the wire drawing machine body 3.
13, further drawn with a first finished die 13, and then inserted into a second finished die 14 in the housing 7,
The wire is drawn again by the second finishing die 14 to a predetermined final diameter.

In the present invention, the finished die is divided into first and second dies.
The finish dies 13 and 14 are provided for the following reasons.

In general, it is known that the residual amount of oil adhered to the surface of the wire l after passing through the die increases as the cross-sectional area reduction rate (reduction) of the wire l due to wire drawing in the die decreases. Therefore, if the reduction rate of the cross-sectional area of the wire 1 in the finished die is reduced by reducing the die diameter of the intermediate die, the amount of oil adhering to the wire 1 after passing through the finished die can be increased.

However, in a normal wire drawing machine, the peripheral speed ratio of each capstan is fixed, and the cross-sectional area reduction rate of the wire 1 at the intermediate die cannot be made smaller than the peripheral speed ratio. The die diameter of the intermediate die with respect to the diameter cannot be smaller than a predetermined fixed value (usually a size corresponding to a cross-sectional area reduction rate of 10 to 15% or more in a finished die). For this reason, it is not possible to increase the amount of oil adhering to the wire 1 after passing through the finished die due to the decrease in the cross-sectional area reduction rate of the wire 1 in the finished die due to the decrease in the die diameter of the intermediate die. .

If this is divided into the finished dies and installed as the first and second finished dies 13 and 14, the total amount of the cross-sectional area reduction rate of the wire 1 in the first and second finished dies 13 and 14 becomes Since the cross-sectional area reduction rate of the wire 1 when one conventional finishing die is provided is the same, there is no problem in drawing the wire 1 first. Next, the wire l in the second finished die 14
Is smaller than the cross-sectional area reduction rate of the wire l when one conventional finished die is provided, the wire l after passing through the second finished die 14 is The amount of oil attached can be increased as compared with the case of the wire l after passing through the finishing die provided. The amount of oil adhering to the wire 1 after passing through the second finished die 14 is determined by the die diameter of the first finished die 13 (the diameter of the intermediate die> the first die).
By changing (finished die> second finished die), the reduction rate of the cross-sectional area of the wire 1 at the second finished die 14 can be easily adjusted.

As described above, in the present invention, the finished dice are divided and provided as the first and second finished dies 13 and 14.

The high-purity aluminum wire g obtained by drawing to the final diameter with the second finishing die 14 is wrapped around a finishing capstan 10 that pulls an aluminum wire 1 installed on the downstream side of the wire drawing machine body 3. From the take-up reel 12 via the guide roll 11.

The wire drawing method of the present invention is configured as described above. According to this, since the finished die is divided and provided as the first and second finished dies 13 and 14, the reduction rate of the cross-sectional area of the wire l at the second finished die 14 is smaller than that of the conventional finished die. Utilizing the fact that the cross-sectional area reduction rate of the wire 1 when one die is provided is smaller, the oil adhesion amount of the wire 1 after passing through the second finishing die 14 can be reduced by the conventional finish It is possible to increase the amount of oil adhering to the wire 1 after passing through the second finished die 14 by changing the die diameter of the first finished die 13 after passing through the second finished die 14. By adjusting the rate of decrease in the cross-sectional area of the wire 1 in the second finished die 14, adjustment can be easily made. Accordingly, the amount of oil adhering thereto can be adjusted to easily obtain a high-purity aluminum wire g having an appropriate amount of oil adhering thereto. Also, no abrasion occurs on the finished capstan 10 and the guide roll 11 or the like.

Table 1 shows the results of the oil adhesion amount in the wire drawing test of the high-purity aluminum wire according to the wire drawing method of the present invention. The high-purity aluminum wire was made of Al99.97%, which was
It was drawn on a mmφ aluminum wire. The lubricating oil has a viscosity of 37 cst (40 ° C) on the intermediate die and a viscosity of 270 cst (4
0 ° C).

As shown in Table 1, in the wire drawing method of the present invention, the finished dies are divided and provided as first and second finished dies, and the high-purity aluminum wire strands of the second finished dies are formed. Since the fact that the cross-sectional area reduction rate is small is used,
A sufficient amount of oil can be attached at the time of wire drawing, and as a result, the amount of oil attached to the high-purity aluminum wire obtained by wire drawing can be made an appropriate amount of about 0.30 mg / m. On the other hand, in the comparative example, only one finished die was provided without dividing the die, so that the cross-sectional area reduction rate of the high-purity aluminum wire in the finished die was large. It cannot be attached, and as a result, the oil content of the high-purity aluminum wire obtained by drawing is a small value of about 0.08 to 0.10 mg / m, which is far from appropriate.

Effect of the Invention As described above, in the wire drawing method of the present invention, a finished die is divided and provided as first and second finished dies, and a low-viscosity lubricating oil is supplied to the first finished die. Since high-viscosity lubricating oil is supplied to the second finished die located downstream of the first finished die, the amount of oil attached can be adjusted to easily produce a high-purity aluminum wire with an appropriate amount of oil attached. And no abrasion occurs on the finished capstan or guide roll. In addition, since it is not necessary to adjust the amount of oil adhering to an appropriate amount after wire drawing,
The productivity at the time of drawing a high-purity aluminum wire can be increased, and the production cost can be reduced.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing one embodiment of the wire drawing method of the present invention. 1: Intermediate die 3: Wire drawing machine body 5, 8: Lubricating oil 10: Finished capstan 13: First finished die 14: Second finished die

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. ⁶ , DB name) B21C 1/00-1/04 B21C 3/14 B21C 9/00

Claims (1)

(57) [Claims] 1. A method for drawing a high-purity aluminum wire by inserting a wire of a high-purity aluminum wire through an intermediate die and a finished die to which lubricating oil has been supplied, wherein the finished die is first and second. Divided into two finishing dies and installed two,
Supplying a low-viscosity lubricating oil to the first finished die;
A high-purity aluminum wire drawing method, characterized in that a high-viscosity lubricating oil is supplied to the second finished die located downstream of the first finished die.