JP2777826B2 - 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 drawing direction of 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. In the drawing direction.

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, when wire is drawn using a normal finished capstan, there is almost no oil attached to the surface of the drawn aluminum wire, and scratches occur on the finished capstan and guy rolls. In order to avoid this, the 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 relates to a method for drawing a high-purity aluminum wire by inserting a wire of a high-purity aluminum wire into an intermediate die and a finished die to which lubricating oil has been supplied, and drawing the finished die into the intermediate die. Is installed independently of the intermediate die outside the wire drawing machine main body, and, among the lubricating oil supplied to the intermediate die and the finished die, the lubricating oil supplied to the finished die is a high-viscosity lubricating oil. This is a method for drawing a high-purity aluminum wire.

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 as before.

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 2 for drawing the element wire 1 of the high-purity aluminum wire drawn to an intermediate diameter by the intermediate die 1 to a predetermined final diameter is provided outside the wire drawing machine main body 3. And is installed independently. In this embodiment, the finishing die 2 is provided with a box-shaped housing 7 of a small room at the outlet of the strand 1 of the wire drawing machine main body 3.
It is installed and housed inside.

The housing 7 is filled with the lubricating oil 8 up to the finished die 2, and the lubricating oil 8 is
Is supplied. According to the present invention, as the lubricating oil 8 supplied to the finished die 2, a high-viscosity lubricating oil is used instead of the low-viscosity lubricating oil 5 described above.

In order to prevent the lubricating oil 5 in the wire drawing machine main body 3 from being mixed into the lubricating oil 8 in the housing 7, for example, a drawing die is formed at the outlet of the high-purity aluminum wire 1 in the wire drawing machine main body 3. 9 are installed. The means for preventing the lubricating oil 5 from being mixed into the lubricating oil 8 is not limited to the installation of the drawing die 9.

The high-purity aluminum wire l drawn to an intermediate diameter by the intermediate die 1 is inserted into the drawing die 9 at the outlet inside the wire drawing machine main body 3 to squeeze the lubricating oil 5, and then finished in the housing 7. The wire is inserted into the die 2 and drawn to a predetermined final diameter by the finished die 2.

The high-purity aluminum wire g obtained by drawing to the final diameter with the finishing die 2 is wound around a finishing capstan 10 for pulling a strand l of an aluminum wire installed on the downstream side of the wire drawing machine body 3 and then guided. It is wound on a take-up reel 12 via a roll 11.

The wire drawing method of the present invention is configured as described above. According to this, the low-viscosity lubricating oil 5 is supplied to the intermediate die 1 installed in the wire drawing machine main body 3, and the high-purity aluminum wire 1 is drawn in the intermediate die 1. The intermediate capstans 4 and 4 can be drawn to an intermediate diameter without tangling the wire l. The finished die 2 is installed outside the wire drawing machine main body 3 independently of the intermediate die 1, and a high-viscosity lubricating oil 8 is supplied to the finished die 2 separately from the intermediate die 1, and the intermediate diameter of the finished die 2 is adjusted. Since the wire l is drawn, even if the finished capstan 10 is used, the decrease in the amount of oil attached can be reduced, thereby adjusting the amount of oil attached to the high purity with an appropriate amount of oil attached. Aluminum wire g can be easily obtained. Also, no abrasion occurs on the finished capstan 10 and the guide roll 11 or the like.

The results of the oil content in the wire drawing test of the high-purity aluminum wire according to the wire drawing method of the present invention are shown in Table 1 together with Comparative Examples. The high-purity aluminum wire used was a wire of Al 99.97%, which was drawn to a 1.2 mmφ aluminum wire.

As shown in Table 1, in the wire drawing method of the present invention, a high-viscosity lubricating oil was supplied to the finished die, so that a sufficient amount of oil could be adhered at the time of wire drawing. 0.30 mg oil content of the obtained high purity aluminum wire
/ m suitable amount. On the other hand, in the comparative example, the same low-viscosity lubricating oil as the intermediate die was supplied to the finished die, so that sufficient oil could not be attached at the time of drawing, and as a result, a high-purity aluminum wire obtained by drawing was obtained. Has a small value of about 0.01 to 0.03 mg / m, which is far from an appropriate amount.

Effect of the Invention As described above, in the wire drawing method of the present invention, the finishing die is installed outside the wire drawing machine main body on which the intermediate die is installed, independently of the intermediate die, and the lubrication supplied to the intermediate die and the finishing die is provided. Among the oils, the lubricating oil supplied to the finishing dies was made of high-viscosity lubricating oil, so that the amount of oil adhering was adjusted to easily obtain a high-purity aluminum wire with an appropriate amount of oil adhering. No abrasion occurs on the capstan or the guide roll. Furthermore, since it is not necessary to perform washing for adjusting the amount of oil content after drawing to an appropriate amount, productivity during drawing of a high-purity aluminum wire can be increased, and production costs 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 2: Finished die 3: Wire drawing machine body 5: Low viscosity lubricant 8: High viscosity lubricant 10: Finished capstan

──────────────────────────────────────────────────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 high-purity aluminum wire through an intermediate die and a finished die to which lubricating oil has been supplied, and setting the finished die to the intermediate die. It is installed independently of the intermediate die outside the drawn wire drawing machine main body, and among the lubricating oil supplied to the intermediate die and the finished die, the lubricating oil supplied to the finished die is a high-viscosity lubricating oil. Characteristic high-purity aluminum wire drawing method.