JP2010184272A - Drawing stock of copper or copper alloy - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drawing stock of copper or a copper alloy which is hard to be scratched when the drawing stock is wound and the wound drawing stock is delivered and excellent in handleability in the wound state. <P>SOLUTION: The drawing stock of the copper or the copper alloy has an oil content quantity of 0.5-50 μg/cm<SP>2</SP>on the wire surface. When the oil content quantity on the surface of the drawing stock is small, the sliding property of the wire surface is insufficient and the wire surface is scratched when the drawing stock is wound and the wound drawing stock is delivered. When the wire surface has much oil content quantity, the drawing stock is apt to cause load collapse in the wound state and the handleability is bad during the storage and conveyance. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a rough drawn wire of copper or a copper alloy. In particular, the present invention relates to a rough drawn wire of copper or copper alloy that is difficult to be damaged when winding a rough drawn wire and feeding the wound rough drawn wire, and that is excellent in handleability even in a wound state.

  For example, copper or copper alloy wire is widely used for coated wires for winding, power transmission / distribution wires, communication wires and the like used for motor coils and magnet coils. In general, the copper or copper alloy wire used in these various applications is manufactured by manufacturing a rough drawn wire of copper or copper alloy having a predetermined wire diameter, and then cold-drawing the rough drawn wire to a desired wire diameter. It is manufactured by wire processing (see, for example, Patent Documents 1 to 4).

  Usually, the copper or copper alloy rough wire is manufactured by supplying a predetermined copper or copper alloy molten metal from a melting furnace such as a shaft furnace to a continuous casting machine, turning the molten metal into an ingot, and then performing this ingot in multiple stages. Supplying to a rolling mill, it performs by carrying out a hot rolling process continuously with a some rolling roll so that this ingot may become a predetermined | prescribed wire diameter. The rough drawn wire cooled after hot rolling is once wound up in a coil shape by a winder (coiler), then fed out from the wound state, supplied to a wire drawing machine, and inserted into a wire drawing die. By doing so, it is processed into various types of wire rods. The above melting furnace (melting process) → continuous casting machine (casting process) → multi-stage rolling mill (rolling process) → winding machine (winding process) has become a series of production lines from the viewpoint of improving productivity. In many cases (see FIG. 1 of Patent Document 1 and FIG. 2 of Patent Document 2).

  Moreover, a cooling reduction tank may be arrange | positioned between a multistage rolling mill and a coiler. In this cooling reduction tank, the rough drawn wire is immersed in a solution such as an alcohol aqueous solution to reduce and cool the rough drawn wire.

  On the other hand, a loose coil and a tight coil are known as the package of the copper or copper alloy drawn wire wound (see, for example, Patent Documents 4 to 6). A loose coil is a packing form in which a loose coil winding machine is used to drop a rough drawing wire from a guide pipe of the winding machine onto a pallet while spirally winding it, and then stacked in order from the bottom. On the other hand, tight coils are tightly wound on a winding bobbin or winding drum using a winding machine for tight coils, and then the winding wire is tightly aligned and wound, and then the winding drum is removed and bound with a band. It is. In addition, when winding the rough drawn wire around the tight coil package, the rough drawn wire that has been cooled after hot rolling is directly wound around the tight coil package, and once again the rough drawn wire that has once been loose coiled is tight. It is also possible to rewind the coil in its package.

  In general, when comparing the loose coil package and the tight coil package, the tight coil package wraps more closely around the rough wire, resulting in a smaller space occupying volume per unit weight. Therefore, there are great advantages in storage and transportation. The loose coil and the tight coil are differently drawn in the manner of drawing the rough wire when drawing, and in the loose coil, the coil is drawn from the upper end of the coil, which is the end of winding. The coil is fed out from the inside of the coil that starts winding (see FIGS. 4 and 5 of Patent Document 5).

JP 2002-103003 A JP 2004-188429 A JP 2006-255717 A JP 2004-114132 A JP-A-6-1531 JP-A-5-8938

  By the way, when winding a copper or copper alloy rough wire around a loose coil or tight coil, an oil component such as lubricating oil may be applied to the surface of the rough wire before winding.

  When winding the rough drawing wire, scratches may occur due to friction between the parts of the winder (such as a guide pipe) and the rough drawing wire or friction between the rough drawing wires in contact with the winding. On the other hand, when a rough drawing line is drawn out, there is a case where a scratch is generated or the lines are tangled due to friction with the rough drawing line in contact with the drawn rough drawing line. Therefore, it is preferable to apply an oil component to the surface of the rough drawn wire to increase the slipperiness of the wire surface.

  In addition, as a method of applying oil to the surface of the rough drawn wire, an oil (lubricating oil) is added to the solution filled in the cooling reduction tank, and the rough drawn wire is immersed in this solution. An oil spray nozzle is provided immediately before the guide pipe of the winder, and a method of spraying lubricating oil from this nozzle is used.

  However, as a result of intensive studies by the present inventors, it has been found that the following problems occur if the amount of oil on the surface of the rough drawn line is not controlled within an appropriate range.

  First, when the amount of oil on the surface of the rough drawn wire is small, the slipperiness of the wire surface is not sufficient, and when the rough drawn wire is wound up and when the wound rough drawn wire is fed out, the wire surface is damaged. On the other hand, when the amount of oil on the surface of the rough drawn wire is large, the cargo collapses easily in the wound state, and the handling property at the time of storage or transportation is poor.

  The present invention has been made in view of the above circumstances, and one of its purposes is that the wound wire is difficult to be scratched and wound when the wound wire is wound and when the wound wire is drawn. It is to provide a rough drawn wire of copper or a copper alloy having excellent handleability.

The rough drawn wire of the copper or copper alloy of the present invention is characterized in that the amount of oil on the surface of the wire is 0.5 μg / cm ² or more and 50 μg / cm ² or less.

When the amount of oil on the surface of the wire satisfies the above range, the following effects are achieved. First, when the oil content is 0.5 μg / cm ² or more, it is possible to effectively prevent scratches when winding the rough drawn wire and feeding the rough drawn wire by improving the slipperiness of the wire surface. be able to. Next, when the oil content is 50 μg / cm ² or less, the occurrence of load collapse can be effectively prevented in the wound state, and the handling property is excellent.

The amount of oil on the surface of the wire is preferably 5 μg / cm ² or more and 30 μg / cm ² or less.

  In the rough drawn wire of copper or copper alloy of the present invention, the thickness of the oxide film on the wire surface is preferably 0.003 μm or more and 0.1 μm or less.

The oxide film here is an oxide film made of Cu ₂ O or CuO, which is formed on the wire surface in the manufacturing process of copper or copper alloy rough wire. And since the oxide film of moderate thickness is formed in the wire surface of the rough drawing wire of copper or a copper alloy, the adhesiveness and the retainability of the oil component in an oil content application process can be improved. Specifically, when the thickness of the oxide film is 0.003 μm (30 mm) or more, a tendency to improve the oil adhesion and retention effect is recognized. However, if the thickness of the oxide film exceeds 0.1 μm (1000 mm), there is a problem that the rough drawn line is discolored, which is not preferable because the commercial value is lowered. Moreover, if the oxide film is too thick, it may cause troubles during wire drawing.

  The thickness of the oxide film on the line surface is preferably 0.01 μm (100 mm) or more and 0.05 (500 mm) μm or less.

  The rough drawn wire of the copper or copper alloy of the present invention is hardly damaged when winding the rough drawn wire and when the wound rough drawn wire is drawn out, and is excellent in handleability in the wound state.

  In the rough drawn wire of the copper or copper alloy of the present invention, the oil applied to the wire surface is a lubricating oil that functions as a lubricant, and commercially available products can be used. Specific examples of the component of the lubricating oil include a mixture of at least one selected from mineral oil, synthetic oil, vegetable oil, and the like and a surfactant, and those having oil and fat and soap as main components. is there. Examples include Lubrite (registered trademark) model number M-20 manufactured by Japan Oil Research Institute, Inc., model number Lubro30FM manufactured by RichardsApex Corporation, model number WM561 manufactured by DAStuart Corporation, and the like. Absent. In addition, what has a discoloration prevention agent which prevents discoloration (oxidation) of the rough drawing line after manufacture may be used for oil.

  Next, a method for controlling the amount of oil on the surface of the wire and the thickness of the oxide film in the rough drawn wire of copper or copper alloy of the present invention will be described.

  Controlling the amount of oil on the surface of the wire can be achieved, for example, by adjusting the flow rate or concentration of the oil sprayed from the oil spray nozzle provided immediately before the guide pipe in a loose coil winder. it can. In this case, the oil amount on the surface of the wire tends to increase as the flow rate or concentration of the sprayed oil increases. For example, it can also be realized by adjusting the amount of oil added to the alcohol aqueous solution in the cooling reduction tank. In this case, the amount of oil on the surface of the wire tends to increase as the concentration of oil in the aqueous alcohol solution increases.

  On the other hand, as a specific example of controlling the thickness of the oxide film on the surface of the wire, it is possible to control the temperature of the rough drawn wire when sent from the multi-stage rolling mill or the cooling rate of the rough drawn wire introduced into the cooling reduction tank. It is done. The control of the temperature or cooling rate of these roughing lines can be realized, for example, by adjusting the casting temperature or rolling temperature or adjusting the cooling capacity of the cooling reduction tank. Here, the cooling capacity can be adjusted by adjusting the alcohol concentration of the alcohol aqueous solution in the cooling reduction tank or by adjusting the temperature of the cooling reduction tank.

(Test Example 1)
A plurality of rough drawn wires with controlled oil amount on the wire surface and the thickness of the oxide film were manufactured and evaluated. In this example, a melting furnace (melting process) → continuous casting machine (casting process) → multi-stage rolling mill (rolling process) → cooling reduction tank (cooling process) → winding machine (winding process) is built in series Using the line, a plurality of tough pitch copper rough wires (4.5 ton = 4500 kg) having a diameter of 8 mm were manufactured. Moreover, each rough drawing wire wound up the rough drawing wire after the cooling sent out from the cooling reduction tank directly in the packing form of the tight coil by using a winder for tight coil in the winding process. Table 1 shows the amount of oil on the surface and the thickness of the oxide film in each rough line (sample Nos. 1-1 to 1-7).

  Here, the amount of oil on the surface of each sample was controlled by adjusting the oil concentration in the alcohol aqueous solution in the cooling reduction tank. For example, in sample No. 1-1, the oil concentration in the aqueous alcohol solution was adjusted to 0.06%. In each sample, Lubrite M-20 was used as the oil.

  On the other hand, the thickness of the oxide film on the surface of each sample was controlled by adjusting the alcohol concentration of the alcohol aqueous solution in the cooling reduction tank. For example, in sample No. 1-1, the alcohol concentration of the aqueous alcohol solution was adjusted to 1.6%.

  In this example, the amount of oil on the wire surface of each sample and the thickness of the oxide film were determined as follows.

To measure the amount of oil applied to the wire surface, a sample piece 30 cm in length and 134 g in weight is taken from the sample. At this time, for the sake of accuracy, sacramento gloves are used for the work and the sample pieces are stored by wrapping them in an aluminum foil so that oil such as sebum does not adhere and oil does not flow out from the sample pieces. Next, the sample piece was ultrasonically cleaned with a fluorocarbon solvent H-997 (dichloropentafluoropropane), and the oil content on the surface of the sample piece was extracted into the solvent, and then an oil concentration meter (OCMA manufactured by Horiba, Ltd.) was used. Then, the oil content in the solvent is measured by the H-997 extraction non-dispersion infrared absorption method. Finally, the amount of oil per unit weight (1 g) of the sample piece is determined based on the measured amount of oil, and this is calculated by converting it to the amount of oil per unit surface area (1 cm ² ) of the sample piece. For example, in an 8 mm diameter tough pitch copper rough wire, when the amount of oil per 1 g of sample piece is 1 μg, the amount of oil on the surface of the wire is 1.777 μg / cm ² .

  The thickness of the oxide film formed on the surface of the wire is obtained by immersing a sample piece collected from the sample in a sodium hydroxide solution and measuring the oxidation-reduction current using a coulometric method.

  In this example, each sample was evaluated for the presence or absence of scratches on the wire surface and the presence or absence of discoloration. Specifically, for each sample wound in a tight coil shape, a rough drawn wire was drawn out and evaluated by visually observing the presence or absence of scratches on the wire surface and the presence or absence of discoloration. The results are shown in Table 1.

From the results in Table 1, samples with an oil content of 0.5 μg / cm ² or more and 50 μg / cm ² or less on the surface of the wire show no scratches on the surface of the wire, and it is difficult for the sample to be damaged when winding and unwinding. I understand. On the other hand, in the sample having an oil content of less than 0.5 μg / cm ^{2 on} the wire surface, scratches are observed on the wire surface, and it can be seen that the wire surface is easily damaged when wound up and fed out. On the other hand, in the sample having an oil content of more than 50 μg / cm ^{2 on} the wire surface, although no scratch was observed on the wire surface, it was confirmed that the coil was tilted during transportation after being removed from the winder. For this reason, the slipperiness of the surface of the wire is too high, so the load collapses easily during transportation and the handling property is considered poor.

  In addition, the sample whose thickness of the oxide film on the surface of the wire was 0.003 μm or more and 0.1 μm or less showed no discoloration and no problem in quality. On the other hand, discoloration was observed in the sample in which the thickness of the oxide film on the surface of the wire exceeded 0.1 μm, and there was a problem in quality. Moreover, the sample in which the thickness of the oxide film on the surface of the wire satisfies the above range tended to have high oil adhesion and retention.

  As described above, the amount of oil on the surface of the rough drawing wire of copper or copper alloy is in an appropriate range, so that when the rough drawing wire is wound and when the wound rough drawing wire is drawn out, it is difficult to be damaged. In addition, the handleability is excellent in the wound state. Furthermore, when the thickness of the oxide film on the surface of the wire is in an appropriate range, there is no discoloration and the quality is excellent, and the effect of attaching and holding oil is high.

  Note that the present invention is not limited to the above-described embodiment, and can be modified as appropriate without departing from the gist of the present invention. For example, the rough drawn wire may be a copper alloy rough drawn wire, and the type of oil may be appropriately changed.

  The rough drawn wire of the copper or copper alloy of the present invention can be suitably used as a wire material such as a coated wire for winding, a transmission / distribution wire, or a communication wire by drawing.

Claims (4)

A rough drawn wire of copper or copper alloy,
A rough drawn wire of copper or a copper alloy, wherein the amount of oil on the surface of the wire is 0.5 μg / cm ² or more and 50 μg / cm ² or less.   The rough drawn wire of copper or copper alloy according to claim 1, wherein the thickness of the oxide film on the wire surface is 0.003 µm or more and 0.1 µm or less. The rough drawn wire of copper or copper alloy according to claim 1 or 2, wherein the amount of oil on the surface of the wire is 5 µg / cm ² or more and 30 µg / cm ² or less.   The rough drawn wire of copper or copper alloy according to any one of claims 1 to 3, wherein the thickness of the oxide film on the wire surface is 0.01 µm or more and 0.05 µm or less.