JP2018172791A - Method for producing hot-dip aluminum-coated steel wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for producing a hot-dip aluminum-coated steel wire which enables efficient production of the hot-dip aluminum-coated steel wire while ensuring that a thickness of a coating hardly becomes partially uneven and lumps of aluminum hardly deposit on a surface of the wire.SOLUTION: A method for producing a hot-dip aluminum-coated steel wire includes the steps of: bringing a stabilization member 12 into contact with a bath surface 11 of a molten aluminum plating bath 1 and a hot-dip aluminum-coated wire 3 at a boundary between the hot-dip aluminum-coated wire 3 and the bath surface 11 of the molten aluminum plating bath 1; adjusting a value of a ratio of an amount of horizontal sliding of the hot-dip aluminum-coated wire 3 to the shortest distance from the bath surface 11 of the molten aluminum plating bath 1 to a contact between a dipping member 10 and the steel wire 2 when the stabilization member 12 is pressed against the hot-dip aluminum-coated steel wire 3 to fall within a range of 0.006-0.2; and locating a nozzle 13 at a boundary between the hot-dip aluminum-coated steel wire 3 and the stabilization member 12 to spray inert gas from a tip 13a of the nozzle 13 to the boundary at a pressure of 0.1-25 kPa.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method for producing a hot-dip aluminized steel wire. In more detail, this invention relates to the manufacturing method of the hot dip aluminized steel wire which can be used conveniently for the wire harness etc. of a motor vehicle, for example.

  In this specification, the hot-dip aluminum-plated steel wire is a steel wire that has been subjected to aluminum plating by continuously pulling the steel wire from the hot-dip aluminum plating bath after the steel wire is immersed in the hot-dip aluminum plating bath. Means. The molten aluminum plating bath means a molten aluminum plating solution.

  Conventionally, copper wires have been used for electric wires used in automobile wire harnesses and the like. However, in recent years, since weight reduction is required, development of an electric wire using a metal wire that is lighter than a copper wire is desired.

  As a metal wire that is lighter than a copper wire, a hot-dip Al-plated steel wire in which a hot-dip aluminum plating is applied to a steel core wire has been proposed (for example, refer to claim 1 of Patent Document 1). The molten Al-plated steel wire is made of a steel core wire, or a material steel wire having a galvanized layer or a nickel-plated layer on the surface of the steel core wire is immersed in a molten aluminum plating bath, and then continuously in a gas phase space. And is pulled up (see, for example, paragraph [0024] of Patent Document 1).

  Moreover, as a method of manufacturing a molten aluminum plated steel wire, a method of manufacturing a molten aluminum plated steel wire by continuously pulling up the steel wire from the molten aluminum plating bath after the steel wire is immersed in the molten aluminum plating bath When the steel wire is immersed in a molten aluminum plating bath and then pulled up from the molten aluminum plating bath, the steel wire is stable to the bath surface and the steel wire at the boundary between the molten aluminum plating bath and the bath surface of the molten aluminum plating bath. And a nozzle having an inner diameter of 1 to 15 mm is disposed so that the tip of the nozzle is located at a location 1 to 50 mm away from the steel wire, and 200 to 800 from the tip of the nozzle. An inert gas having a temperature of ° C. is blown toward the boundary between the steel wire and the bath surface of the molten aluminum plating bath at a volume flow rate of 2 to 200 L / min. Method for producing a molten aluminum-plated steel wire characterized by attaching has been proposed (e.g., see Patent Document 2). According to the said manufacturing method, the wire diameter is uniform and the outstanding effect that the aluminum aluminum plating steel wire to which an aluminum lump cannot adhere easily to the surface can be manufactured efficiently is produced.

  However, when a hot dip galvanized steel wire is produced by the above-described method, there is a possibility that an uneven thickness portion having a large difference in the thickness of the galvanized coating between the thick portion and the thin portion of the galvanized coating may occur in the galvanized steel wire. When wire drawing is performed on the hot-dip aluminum-plated steel wire, the wire diameter of the steel wire becomes non-uniform, so wire breakage may occur when wire drawing is performed at high speed, or molten aluminum after wire drawing. There is a risk that the so-called “wire habit” of the plated steel wire becomes large.

JP 2014-185355 A Japanese Patent Laying-Open No. 2015-134961

  The present invention has been made in view of the prior art, and it is difficult to produce an uneven thickness portion with a large difference in the thickness of the plating film between the thick part and the thin part of the hot-dip aluminized steel wire. It is an object of the present invention to provide a method for producing a hot-dip aluminum-plated steel wire capable of efficiently producing a hot-dip aluminum-plated steel wire to which an aluminum lump is difficult to adhere.

The present invention
(1) After dipping a steel wire in a molten aluminum plating bath, the steel wire is continuously pulled up from the molten aluminum plating bath through a dipping member immersed in the molten aluminum plating bath to obtain a molten aluminum plated steel. A method of manufacturing a wire, comprising: a stabilizing member at a boundary portion between a molten aluminum plated steel wire pulled up from the molten aluminum plating bath and a bath surface of the molten aluminum plating bath; The immersion member and the steel are brought into contact with the molten aluminum plated steel wire from the horizontal slide amount L1 of the molten aluminum plated steel wire and the bath surface of the molten aluminum plating bath when the stabilizing member is pressed against the molten aluminum plated steel wire. The value of the ratio (L1 / L2) to the shortest length L2 to the contact point with the line is 0.006 To 0.2, a nozzle for spraying an inert gas on the boundary between the hot-dip aluminized steel wire and the stabilizing member is disposed, and the inert gas is supplied to the boundary from the tip of the nozzle. A method for producing a hot-dip aluminized steel wire, characterized by being sprayed at a pressure of 0.1 to 25 kPa,
(2) The method for producing a hot-dip aluminum-plated steel wire according to (1) above, wherein the steel wire is a steel wire made of carbon steel or stainless steel, and (3) the temperature of the hot-dip aluminum plating bath The present invention relates to the method for producing a hot dip galvanized steel wire according to (1) or (2), wherein the temperature is adjusted to be higher by 25 ° C. than the melting point.

  According to the method for producing a hot-dip aluminum-plated steel wire of the present invention, an uneven-thickness portion having a large difference in the thickness of the plating film between the thick and thin portions of the hot-dip aluminum-plated steel wire is unlikely to occur. There is an excellent effect that a hot-dip aluminized steel wire in which a lump is difficult to adhere can be produced efficiently.

It is a schematic explanatory drawing which shows one embodiment of the manufacturing method of the hot dip galvanized steel wire of this invention. It is a schematic sectional drawing which shows one embodiment of the steel wire introduction part control apparatus shown by FIG. It is a schematic sectional drawing which shows one embodiment of the bath surface control apparatus used for the steel wire introduction part control apparatus shown by FIG. 1 and FIG. In the manufacturing method of the hot dip galvanized steel wire of the present invention, when the stabilizing member is pressed against the hot dip aluminum plated steel wire, the horizontal slide amount L1 of the hot dip aluminum plated steel wire and the bath surface of the hot dip aluminum plating bath are immersed. It is a schematic explanatory drawing when adjusting the value of the ratio (L1 / L2) with the shortest length L2 to the point of contact with the steel wire. In the manufacturing method of the molten aluminum plating steel wire of this invention, it is a schematic explanatory drawing of the boundary part of the steel wire at the time of pulling up a steel wire from a molten aluminum plating bath, and the bath surface of a molten aluminum plating bath. It is a schematic plane explanatory drawing regarding the position of the stabilization member used with one embodiment of the manufacturing method of the hot dip galvanized steel wire shown by FIG. In one embodiment of the manufacturing method of the hot dip galvanized steel wire shown by FIG. 1, it is a schematic explanatory drawing of the stabilization member in a perpendicular direction with respect to the bath surface of a hot dip aluminum plating bath. FIG. 2 is a schematic explanatory view of a nozzle in a horizontal direction with respect to a bath surface of a hot-dip aluminum plating bath in an embodiment of the method for producing a hot-dip aluminum plating steel wire shown in FIG. 1. FIG. 2 is a schematic explanatory view of a nozzle in a direction perpendicular to a bath surface of a molten aluminum plating bath in one embodiment of a method for producing a molten aluminum plated steel wire shown in FIG. 1.

  As described above, the method for producing a hot-dip aluminum-plated steel wire according to the present invention involves immersing the steel wire in a hot-dip aluminum plating bath, and then using the immersion member immersed in the hot-dip aluminum plating bath. A method of producing a molten aluminum plated steel wire by continuously pulling up from a molten aluminum plating bath, and at a boundary portion between the molten aluminum plated steel wire pulled up from the molten aluminum plating bath and the bath surface of the molten aluminum plating bath. A horizontal sliding amount L1 of the molten aluminum plated steel wire when the stabilizing member is brought into contact with the bath surface of the molten aluminum plating bath and the molten aluminum plated steel wire and the stabilizing member is pressed against the molten aluminum plated steel wire. And the contact between the immersion member and the steel wire from the bath surface of the molten aluminum plating bath. In order to adjust the value of the ratio (L1 / L2) to the shortest length L2 up to 0.006 to 0.2 and to spray an inert gas at the boundary between the hot-dip aluminum-plated steel wire and the stabilizing member The nozzle is disposed, and an inert gas is sprayed from the tip of the nozzle to the boundary portion at a pressure of 0.1 to 25 kPa.

  According to the method for producing a hot-dip aluminum-plated steel wire of the present invention, since the above operation is adopted, the thickness difference between the thick and thin portions of the hot-dip aluminum-plated steel wire is large. It is possible to efficiently produce a hot-dip aluminized steel wire in which a portion is hardly formed and an aluminum lump is difficult to adhere to the surface.

  Below, although the manufacturing method of the hot dip galvanized steel wire of this invention is demonstrated based on drawing, this invention is not limited only to the embodiment as described in the said drawing.

  FIG. 1 is a schematic explanatory view showing one embodiment of a method for producing a hot-dip aluminized steel wire of the present invention.

  In the manufacturing method of the hot dip aluminum plating steel wire of the present invention, after the steel wire 2 is immersed in the hot dip aluminum plating bath 1, the steel wire 2 is continuously pulled up from the hot dip aluminum plating bath 1 to thereby obtain hot dip aluminum plating steel. Line 3 is manufactured.

  Examples of the steel material constituting the steel wire 2 include stainless steel and carbon steel, but the present invention is not limited to such examples.

  Stainless steel is an alloy steel containing 10% by mass or more of chromium (Cr). Examples of the stainless steel include austenitic steel materials, ferritic steel materials, martensitic steel materials and the like specified in JIS G4309, but the present invention is not limited only to such examples. Specific examples of the stainless steel include stainless steels such as SUS301 and SUS304, which are generally considered to be metastable; austenitic stainless steels such as SUS305, SUS310, and SUS316; SUS405, SUS410L, SUS429, SUS430, SUS434, Ferritic stainless steels such as SUS436, SUS444, and SUS447; martensitic stainless steels such as SUS403, SUS410, SUS416, SUS420, SUS431, and SUS440, as well as chromium-nickel-manganese stainless steel classified in the SUS200 series However, the present invention is not limited to such examples.

  Carbon steel is a steel material containing 0.02% by mass or more of carbon (C). Examples of carbon steel include steel materials specified in the standard of hard steel wire rods of JIS G3506, steel materials specified in the standard of mild steel wire rods of JIS G3505, and the present invention is limited to such examples only. Is not to be done. Specific examples of carbon steel include hard steel and mild steel, but the present invention is not limited to such examples.

  Among the steel materials, stainless steel and carbon steel are preferable from the viewpoint of increasing the tensile strength of the hot-dip aluminized steel wire 3.

  The diameter of the steel wire 2 is not specifically limited, It is preferable to adjust suitably according to the use of the hot-dip aluminum plating steel wire 3. FIG. For example, when the hot-dip aluminum-plated steel wire 3 is used for an application such as an automobile wire harness, the diameter of the steel wire 2 is usually preferably about 0.05 to 0.5 mm.

  The steel wire 2 may be degreased before hot-dip aluminum plating is performed. The steel wire 2 is degreased by, for example, a method of degreasing the steel wire 2 by immersing the steel wire 2 in an alkaline degreasing solution, washing with water, neutralizing the alkali content adhering to the steel wire 2, and washing again with water. It can be performed by a method in which electrolytic degreasing is performed by energizing the steel wire 2 with the wire 2 immersed in an alkaline degreasing solution. The alkali degreasing solution may contain a surfactant from the viewpoint of improving the degreasing power.

  Further, from the viewpoint of efficiently forming a smooth aluminum plating film on the steel wire 2, before the steel wire 2 is immersed in the molten aluminum plating bath 1, the surface of the steel wire 2 is pre-plated. Also good. Examples of the metal constituting the pre-plating treatment include zinc, nickel, chromium, and alloys thereof, but the present invention is not limited to such examples. Only one layer may be sufficient as the plating film formed by the said pre-plating process, and the multiple layer which consists of the same or different metal may be sufficient as it.

  In FIG. 1, the steel wire 2 is sent out from the delivery device 4, continuously conveyed in the direction of arrow A, and immersed in the molten aluminum plating bath 1 in the plating bath 5.

  In addition, when the steel wire 2 is the steel wire 2 which consists of carbon steel, even if the steel wire 2 is degreased, there is a possibility that rust may be generated on the surface of the steel wire 2 before performing hot-dip aluminum plating. The steel wire 2 is preferably degreased between the delivery device 4 and the molten aluminum plating bath 1. Degreasing of the steel wire 2 made of carbon steel can be performed by the same method as the degreasing of the steel wire 2.

  In the molten aluminum plating bath 1, only aluminum may be used, and if necessary, other elements may be contained within a range not impairing the object of the present invention.

  Examples of the other elements include nickel, chromium, zinc, silicon, copper, and iron, but the present invention is not limited to such examples. When these other elements are contained in aluminum, the mechanical strength of the plating film (not shown) can be increased, and consequently the tensile strength of the hot-dip aluminum-plated steel wire 3 can be increased.

  Among the other elements, although depending on the type of the steel wire 2, formation of an iron-aluminum alloy layer having brittleness between iron contained in the steel wire 2 and aluminum contained in the plating film Silicon is preferable from the viewpoint of efficiently plating the steel wire 2 by reducing the melting point and increasing the mechanical strength of the plating film and lowering the melting point of the molten aluminum plating bath 1.

  The lower limit of the content of the other elements in the plating film is 0% by mass. The upper limit value of the content of the other element in the plating film is, for example, the generation of an iron-aluminum alloy layer having brittleness between iron contained in the steel wire 2 and aluminum contained in the plating film. From the viewpoint of sufficiently exhibiting the properties of other elements such as efficiently plating the steel wire 2 by suppressing, increasing the mechanical strength of the plating film, and lowering the melting point of the molten aluminum plating bath 1. , Preferably 0.3% by mass or more, more preferably 0.5% by mass or more, further preferably 1% by mass or more, and preferably 50% by mass from the viewpoint of suppressing potential difference corrosion due to contact with the aluminum wire. Hereinafter, it is more preferably 20% by mass or less, and further preferably 15% by mass or less.

  In addition, elements such as nickel, chromium, zinc, copper, and iron may be inevitably mixed into the molten aluminum plating bath 1.

  The lower limit of the bath temperature of the molten aluminum plating bath 1 is a temperature equal to or higher than the melting temperature of the molten aluminum plating bath 1 when the molten aluminum plated steel wire 3 is produced. The temperature is higher than the melting point.

  When the bath temperature of the molten aluminum plating bath 1 is adjusted to a temperature 25 ° C. higher than the melting point of the molten aluminum plating bath 1, the temperature of the inert gas discharged from the tip 13a of the nozzle 13 is room temperature (for example, 0 ° C. Even at room temperature above, there is hardly any uneven thickness portion where the difference in thickness between the thick portion and the thin portion of the plating film is large, and the aluminum agglomerated steel wire 3 with almost no aluminum lump adhering to the surface. Can be obtained.

  Accordingly, the inert gas discharged from the tip 13a of the nozzle 13 is not heated, and an uneven thickness portion having a large difference in thickness between the thick portion and the thin portion of the plating film hardly occurs, and aluminum is formed on the surface. From the viewpoint of obtaining a molten aluminum-plated steel wire 3 with almost no lump attached, it is preferable to adjust the bath temperature of the molten aluminum plating bath 1 to a temperature that is 25 ° C. or higher higher than the melting point of the molten aluminum plating bath 1.

  The upper limit of the bath temperature of the molten aluminum plating bath 1 is preferably 800 ° C. or lower, more preferably 780 ° C. or lower, and further preferably 750 ° C. or lower, from the viewpoint of improving thermal efficiency.

  Moreover, it is preferable that the bath temperature of the molten aluminum plating bath 1 is 680-720 degreeC from a viewpoint of manufacturing efficiently the molten aluminum plating steel wire 3 to which an aluminum lump does not adhere to the surface.

  In addition, the bath temperature of the molten aluminum plating bath 1 is a molten aluminum at a position about 300 mm deep from the bath surface of the molten aluminum plating bath 1 by inserting a temperature sensor into a protective tube for protecting the thermocouple. It is a value when immersed in the vicinity of the steel wire 2 pulled up from the plating bath 1 and measured.

  In the present invention, the steel wire 2 is preheated before the steel wire 2 is immersed in the molten aluminum plating bath 1 from the viewpoint of efficiently producing the hot-dip aluminum-plated steel wire 3 on which the aluminum lump is difficult to adhere to the surface. It is preferable to pass the steel wire 2 through the steel wire introduction part control device 8 having the bath surface control device 7 for preventing the oxide film from adhering to the heating device 6 and the surface of the steel wire 2.

  Examples of the steel wire introduction unit control device 8 include the steel wire introduction unit control device 8 shown in FIG. 2, but the present invention is not limited to such examples. FIG. 2 is a schematic cross-sectional view showing an embodiment of the steel wire introduction section control device 8 shown in FIG.

  The steel wire introduction unit control device 8 includes a heating device 6 and a bath surface control device 7. As shown in FIG. 2, the heating device 6 includes a tubular heating device body 6a made of a steel material such as stainless steel. The interior 6b of the heating device body 6a is hollow in order to pass the steel wire 2 in the direction of arrow B.

  Examples of the heating gas vented to the heating device 6 include air, inert gases such as nitrogen gas, argon gas, and helium gas, but the present invention is not limited to such examples. Absent. Among these heating gases, the heating gas discharged from the lower end 6d of the heating device 6 is vented to the inside from the inlet of the upper end 7a of the bath surface control device 7 disposed below the heating device 6, From the viewpoint of preventing the molten aluminum plating bath 1 in the bath surface control device 7 from being oxidized by making the inside an inert gas atmosphere, an inert gas is preferable.

  The temperature of the heated gas cannot be determined unconditionally because it varies depending on the type of steel wire 2 used and its diameter, the wire speed, the flow rate of the heated gas, and the like. Therefore, it is preferable to adjust the temperature of the heated gas so that the steel wire 2 is appropriately heated according to the above conditions.

  The lower limit value of the preheating temperature of the steel wire 2 is preferably 60 ° C. or higher, more preferably 80 ° C. or higher, more preferably 150 ° C. or higher, and still more preferably, from the viewpoint of efficiently producing the hot-dip aluminized steel wire 3. 200 ° C. or higher. The upper limit of the heating temperature of the steel wire 2 varies depending on the type of the steel wire 2 and cannot be determined unconditionally. However, in consideration of energy efficiency, it is usually preferably 1000 ° C. or less, more preferably 900 ° C. or less. More preferably, it is 800 ° C. or lower. In addition, the preheating temperature of the steel wire 2 is a temperature when measured based on the method described in the following examples.

  The length of the heating device main body 6a shown in FIG. 2 is not particularly limited as long as the length can be adjusted so that the steel wire 2 is heated to a predetermined temperature. 1 to 5 m. Moreover, since the diameter of the inside 6b of the heating apparatus main body 6a differs depending on the diameter and type of the steel wire 2 to be used, it cannot be determined unconditionally. About 50 times. If the example is given, when using the steel wire 2 whose diameter is 0.2 mm, it is preferable that the diameter of the inside 6b of the heating apparatus main body 6a is about 0.3-10 mm.

  A branch pipe 6e having a heated gas vent 6c is disposed on the side surface of the heating apparatus body 6a. The steel wire 2 passed through the heating device 6 can be heated by ventilating the heating gas from the heating gas vent 6c of the branch pipe 6e, and a heater (not shown) is installed in the branch pipe 6e. The heated gas that is disposed and vented into the branch pipe 6e by the heater may be heated. In the embodiment shown in FIG. 2, seven branch pipes 6e are arranged, but the number of branch pipes 6e is not particularly limited. The number of branch pipes 6e may be only one, or may be about 2-10.

  In the embodiment shown in FIG. 2, a gap D is provided between the lower end 6 d of the heating device 6 and the upper end 7 a of the bath surface control device 7 disposed below the heating device 6. The gap D is preferably about 3 to 10 mm from the viewpoint of efficiently discharging the heated gas from the gap D.

  The gap D is not necessarily provided, and the heating device 6 and the bath surface control device 7 may be configured as separate members, and may be integrated by, for example, screw fitting. When the heating device 6 and the bath surface control device 7 are integrated, if necessary, an outlet (not shown) for discharging the heated gas vented into the heating device 6 is provided in the heating device 6 or You may provide in the side surface of the bath surface control apparatus 7. FIG.

  In the present invention, for example, an electric heating device, an induction heating device, or the like can be used instead of the heating device 6.

  Examples of the bath surface control device 7 include the bath surface control device 7 shown in FIG. 3, but the present invention is not limited to such examples.

  FIG. 3 is a schematic cross-sectional view showing an embodiment of the bath surface control device 7 used in the steel wire introduction portion control device 8 shown in FIGS. 1 and 2.

  As shown in FIG. 3, the bath surface control device 7 has a tubular body 9 having a through hole 9 a for allowing the steel wire 2 to penetrate in the direction of arrow C therein. The total length L of the bath surface control device 7 is usually preferably 30 to 500 mm, more preferably 40 to 300 mm, and still more preferably 50 to 100 mm.

  The tubular body 9 has an immersion region 9b for immersing in the molten aluminum plating bath 1 from the end of one end on the side immersed in the molten aluminum plating bath 1 to a virtual line P shown in FIG. 3 along the longitudinal direction. . The length of the immersion region 9b is usually preferably 2 to 20 mm, more preferably 5 to 15 mm.

  In the longitudinal direction of the tubular body 9, the length of the portion not immersed in the molten aluminum plating bath 1 is usually preferably 5 mm or more, more preferably 10 mm or more.

  Ratio of the area of the opening of the through hole 9a of the tubular body 9 to the area of the cross section of the steel wire 2 used for hot dip aluminum plating (so-called cross section of the steel wire 2) [of the through hole 9a of the tubular body 9 The value of the area of the opening / the area in the cross section of the steel wire 2 is preferably 3 or more from the viewpoint of smoothly introducing the steel wire 2 into the through hole 9a of the tubular body 9, and is oxidized to the steel wire 2 From the viewpoint of preventing the film from attaching, it is preferably 4000 or less, more preferably 3000 or less, still more preferably 2000 or less, and still more preferably 1000 or less.

  The shape of the opening part of the through-hole 9a which the tubular body 9 has is arbitrary, circular shape may be sufficient as it, and other shapes may be sufficient as it. The gap (clearance) between the opening of the through hole 9a of the tubular body 9 and the steel wire 2 is preferably 10 μm or more from the viewpoint of preventing sliding between the inner wall of the through hole 9a of the tubular body 9 and the steel wire 2. More preferably, it is 20 μm or more, more preferably 50 μm or more, and still more preferably 100 μm or more.

  As shown in FIG. 3, the opening of the through-hole 9 a of the tubular body 9 includes an opening 9 d in the introduction port 9 c for introducing the steel wire 2 at one end of the tubular body 9, and the tubular body 9. It is the opening 9f in the discharge port 9e for discharging the steel wire 2 at the end. The area and shape of the opening 9d and the opening 9f may be the same or different, but the steel wire 2 is smoothly passed through the through hole 9a of the tubular body 9, and the tubular body 9 As shown in FIG. 3, from the viewpoint of efficiently manufacturing the hot-dip aluminum-plated steel wire 3 in which the inner wall of the through-hole 9a and the steel wire 2 are prevented from sliding and the plating film is uniformly formed on the entire surface. Furthermore, it is preferable that the area and shape of the opening 9d and the opening 9f are the same.

  If necessary, the steel wire 2 that has passed through the steel wire introduction part control device 8 is immersed in the molten aluminum plating bath 1.

  The wire speed of the steel wire 2 is preferably 100 m / min or more from the viewpoint of efficiently producing the molten aluminum-plated steel wire 3, and the oxide film formed on the surface of the molten aluminum plating bath 1 is scattered. From the viewpoint of efficiently producing the hot-dip aluminum-plated steel wire 3 that suppresses and hardly has an oxide film on the surface, it is preferably 1000 m / min or less, more preferably 800 m / min or less.

  The time during which the steel wire 2 is immersed in the molten aluminum plating bath 1 (plating time) is adjusted so that the thickness of the plating film formed on the surface of the steel wire 2 becomes a predetermined thickness. Although the time (plating time) in which the steel wire 2 is immersed in the molten aluminum plating bath 1 varies depending on the required thickness of the plating film, the bath temperature of the molten aluminum plating bath 1, etc., it cannot be generally determined. Usually, it is about 0.3 to 1 second.

  Next, as shown in FIG. 1, after the steel wire 2 is immersed in the molten aluminum plating bath 1, the steel wire 2 is molten via the immersion member 10 immersed in the molten aluminum plating bath 1. By pulling up from the bath surface 11 of 1, the plating film of the molten aluminum plating bath 1 is formed on the surface of the steel wire 2, and the molten aluminum plated steel wire 3 is obtained.

  When the steel wire 2 is continuously pulled up from the molten aluminum plating bath 1, an uneven thickness portion having a large difference in thickness between the thick portion and the thin portion of the plating film hardly occurs, and the aluminum lump is formed on the surface. From the viewpoint of efficiently producing the hot-dip aluminum-plated steel wire 3 that is difficult to adhere, it is preferable to pull up the steel wire 2 in the vertical direction.

  As shown in FIG. 4, the stabilizing member 12 is attached to the bath surface of the molten aluminum plating bath 1 at the boundary between the molten aluminum plating steel wire 3 pulled up from the molten aluminum plating bath 1 and the bath surface of the molten aluminum plating bath 1. 11 and the molten aluminum plating steel wire 3 are brought into contact with each other, and the horizontal slide amount L1 of the molten aluminum plating steel wire 3 and the bath surface of the molten aluminum plating bath 1 when the stabilizing member 12 is pressed against the molten aluminum plating steel wire 3. The value (L1 / L2) of the shortest length L2 from 11 to the contact point between the immersion member 10 and the steel wire 2 is adjusted to 0.006 to 0.2.

  In the present invention, since the above operation is adopted, an uneven thickness portion having a large difference in thickness between a thick portion and a thin portion of the plating film hardly occurs, and aluminum lump hardly adheres to the surface. The hot-dip aluminum-plated steel wire 3 can be produced efficiently.

  FIG. 4 shows the horizontal slide amount L1 of the molten aluminum plated steel wire 3 when the stabilizing member 12 is pressed against the molten aluminum plated steel wire 3 in the method for manufacturing the molten aluminum plated steel wire 3 of the present invention. It is a schematic explanatory drawing when adjusting the value (L1 / L2) of the shortest length L2 from the bath surface 11 of the molten aluminum plating bath 1 to the contact point of the immersion member 10 and the steel wire 2.

  In FIG. 4, the immersion member 10 and the steel wire from the horizontal sliding amount L1 of the molten aluminum plated steel wire 3 and the bath surface 11 of the molten aluminum plating bath 1 when the stabilizing member 12 is pressed against the molten aluminum plated steel wire 3. The value of the ratio (L1 / L2) to the shortest length L2 to the point of contact with 2 is less likely to cause an uneven thickness portion where the thickness difference between the thick portion and the thin portion of the plating film 19 is large. From the viewpoint of efficiently producing the hot-dip aluminum-plated steel wire 3 on which the aluminum lump is difficult to adhere to the surface, it is 0.006 to 0.2, preferably 0.01 to 0.06.

  The horizontal slide amount L1 of the molten aluminum plated steel wire 3 when the stabilizing member 12 is pressed against the molten aluminum plated steel wire 3 is changed from the steel wire 2 to the steel wire in a state where the stabilizing member 12 is not pressed against the steel wire 2. 2 is the amount of change to the steel wire 2 in a state in which the stabilizing member 12 is pressed against the surface, in other words, the amount of bending of the steel wire 2 by the stabilizing member 12. The slide amount L1 is not particularly limited, but a molten aluminum plating in which an aluminum lump does not easily adhere to the surface is difficult to produce an uneven thickness portion in which the thickness difference between the thick portion and the thin portion of the plating film 19 is large. From a viewpoint of manufacturing the steel wire 3 efficiently, Preferably it is 0.15-80 mm, More preferably, it is 0.2-60 mm.

  The shortest length L2 from the bath surface 11 of the molten aluminum plating bath 1 to the contact point between the dipping member 10 and the steel wire 2 is an uneven thickness portion where the difference in thickness between the thick and thin portions of the plating film is large. Is preferably 10 to 500 mm, more preferably 20 to 400 mm from the viewpoint of efficiently producing the hot dip aluminized steel wire 3 in which the aluminum lump is difficult to adhere to the surface.

  Since the immersion member 10 is used by being immersed in the molten aluminum plating bath 1, examples of the material of the immersion member 10 include metals and ceramics having a melting point higher than the heating temperature of the molten aluminum plating bath 1. However, the present invention is not limited to such examples. Examples of the shape of the dipping member 10 include a cylinder and a polygonal column, but the present invention is not limited to such examples. When the immersion member 10 is, for example, a columnar or cylindrical roll, the diameter is not particularly limited, and is usually about 200 to 500 mm. The roll may be a rotating roll or a fixed roll. Therefore, the immersion member 10 may be fixed without rotating, and may be installed so as to rotate along the traveling direction of the steel wire 2.

  As shown in FIG. 5, when the steel wire 2 is pulled up from the molten aluminum plating bath 1 in the direction of arrow E, the bath surface of the plating bath 1 accompanying the molten aluminum plated steel wire 3 pulled up from the molten aluminum plating bath 1. The meniscus 18 is formed by lifting 11. When the tip 18a of the meniscus 18 extends upward, the tip 18a of the meniscus 18 is solidified to form an aluminum lump, and the aluminum lump may adhere to the plating film 19 of the hot dip galvanized steel wire 3 as a foreign matter.

  Accordingly, in order to prevent foreign matter such as an aluminum lump from adhering to the surface of the molten aluminum plated steel wire 3 by suppressing the tip 18a of the meniscus 18 from extending excessively upward, a molten aluminum plating bath The stabilizing member 12 is brought into contact with the bath surface 11 of the molten aluminum plating bath 1 and the molten aluminum plated steel wire 3 at the boundary between the molten aluminum plated steel wire 3 pulled up from 1 and the bath surface 11 of the molten aluminum plating bath 1. In addition, a nozzle 13 for spraying an inert gas on the boundary between the hot-dip aluminized steel wire 3 and the stabilizing member 12 is disposed.

  5 shows a method for producing a hot-dip aluminum-plated steel wire according to the present invention, in the boundary portion between the steel wire 2 and the bath surface 11 of the hot-dip aluminum plating bath 1 when the steel wire 2 is pulled up from the hot-dip aluminum plating bath 1. It is a schematic explanatory drawing.

  Examples of the stabilizing member 12 include a stainless steel square bar and a round bar having a heat-resistant cloth material 12a wound on the surface thereof, but the present invention is not limited to such examples. Examples of the heat-resistant cloth material 12a include woven fabrics and non-woven fabrics containing heat-resistant fibers such as ceramic fibers, carbon fibers, aramid fibers, and imide fibers, but the present invention is limited only to such examples. is not. The heat-resistant cloth material 12a makes the surface (new surface) of the heat-resistant cloth material 12a not contacted with aluminum contact the steel wire 2 from the viewpoint of suppressing the adhesion of aluminum lump to the surface of the hot-dip aluminum-plated steel wire 3. Is preferred.

  The stabilizing member 12 is preferably brought into contact with both the bath surface 11 of the molten aluminum plating bath 1 and the molten aluminum plated steel wire 3 simultaneously. When the stabilizing member 12 is simultaneously brought into contact with both the bath surface 11 of the molten aluminum plating bath 1 and the molten aluminum plated steel wire 3, the pulsation of the bath surface 11 of the molten aluminum plating bath 1 is suppressed. As a result, the pulsation of the meniscus 18 is suppressed, so that the plating film 19 can be uniformly formed on the surface of the steel wire 2.

  When the stabilizing member 12 is brought into contact with the hot dip galvanized steel wire 3, the stabilizing member 12 is lightly pressed against the hot dip galvanized steel wire 3 from the viewpoint of suppressing minute vibration of the hot dip aluminum plated steel wire 3. Is preferred.

  The position of the stabilizing member 12 in the horizontal direction with respect to the bath surface 11 of the molten aluminum plating bath 1 is arbitrary and is not particularly limited. When the arbitrary position of the stabilizing member 12 in the horizontal direction with respect to the bath surface 11 of the molten aluminum plating bath 1 is set to 0 °, the horizontal position of the stabilizing member 12 is within a range of 0 ° to 360 °. It can be set arbitrarily.

  Therefore, for example, as shown in FIG. 6, when the stabilizing member 12 </ b> A disposed at an arbitrary position X is set as a reference position, the stabilizing member 12 </ b> A is rotated around the molten aluminum plated steel wire 3. The stabilizing member 12B may be disposed at a position rotated by 90 ° from the position of the stabilizing member 12A, or the stabilizing member 12C may be disposed at a position rotated by 180 ° from the position of the stabilizing member 12A. The stabilizing member 12D may be arranged at a position rotated by 270 ° from the position of the stabilizing member 12A.

  FIG. 6 is a schematic plan view regarding the position of the stabilizing member 12 used in one embodiment of the method for producing the hot dip galvanized steel wire shown in FIG. 1, and the diameter of the hot dip galvanized steel wire 3 is The position of the stabilizing member 12 is shown enlarged for easy understanding.

  Moreover, the angle of the vertical direction which the hot-dip galvanized steel wire 3 and the stabilizing member 12 make is arbitrary, and the effect which is the objective of this invention can be expressed even if it is a case where it is any angle. For example, as shown in FIG. 7, the vertical angle α between the galvanized steel wire 3 and the stabilizing member 12 is 90 ° for the stabilizing member 12E and about 45 ° for the stabilizing member 12F. It is.

  FIG. 7 is a schematic explanatory view of the stabilizing member 12 in the vertical direction with respect to the bath surface 11 of the molten aluminum plating bath 1 in one embodiment of the method for producing the molten aluminum plated steel wire shown in FIG. .

  A nozzle 13 for spraying an inert gas is disposed on the boundary between the hot-dip aluminized steel wire 3 and the stabilizing member 12. The tip 13 a of the nozzle 13 is disposed so that an inert gas can be blown onto the boundary between the steel wire 2 and the bath surface 11 of the molten aluminum plating bath 1. The distance (shortest distance) from the steel wire 2 to the tip 13a of the nozzle 13 is preferably from the viewpoint of avoiding contact between the tip 13a of the nozzle 13 and the steel wire 2 and efficiently producing the molten aluminum-plated steel wire 3. Viewpoint of obtaining a molten aluminum-plated steel wire 3 that is 1 mm or more and that there is almost no uneven thickness portion in which the difference in thickness between the thick portion and the thin portion of the plating film 19 is large and the aluminum lump hardly adheres to the surface. Therefore, it is preferably 50 mm or less, more preferably 40 mm or less, still more preferably 30 mm or less, still more preferably 10 mm or less, and still more preferably 5 mm or less.

  The inner diameter of the tip 13a of the nozzle 13 is such that the inert gas discharged from the tip 13a of the nozzle 13 is precisely blown onto the boundary portion between the steel wire 2 and the bath surface 11 of the hot-dip aluminum plating bath 1 to thereby obtain hot-dip aluminum-plated steel. From the viewpoint of efficiently producing the wire 3, the thickness is preferably 1 mm or more, more preferably 2 mm or more, and there is almost no uneven thickness portion where the thickness difference between the thick portion and the thin portion of the plating film 19 is large. From the viewpoint of obtaining a hot-dip aluminum-plated steel wire 3 on which almost no aluminum lump adheres to the surface, it is preferably 15 mm or less, more preferably 10 mm or less, and even more preferably 5 mm or less.

  In the embodiment shown in FIG. 5, the nozzle 13 is arranged at a position facing the hot-dip galvanized steel wire 3. However, the position of the nozzle 13 in the horizontal direction with respect to the bath surface 11 of the molten aluminum plating bath 1 is not particularly limited and is arbitrary. Therefore, for example, as shown in FIG. 8, the discharge direction of the inert gas discharged from the nozzle 13 and the stabilizing member 12 in the horizontal direction with respect to the bath surface 11 of the molten aluminum plating bath 1 are the molten aluminum plated steel. Assuming that the nozzle 13 when the direction in contact with the wire 3 is the same as the nozzle 13P, the nozzle 13P is rotated around the molten aluminized steel wire 3, and the nozzle is rotated 90 ° from the position of the nozzle 13P. 13Q may be arranged, the nozzle 13R may be arranged at a position rotated 180 ° from the position of the nozzle 13P, or the nozzle 13S may be arranged at a position rotated 270 ° from the position of the nozzle 13P.

  FIG. 8 is a schematic explanatory view of the nozzle 13 in the horizontal direction with respect to the bath surface 11 of the molten aluminum plating bath 1 in the embodiment of the method for producing the molten aluminum plated steel wire shown in FIG. The diameter of the aluminized steel wire 3 is shown enlarged to illustrate the position of the nozzle 13.

  Moreover, the angle of the perpendicular direction between the hot-dip galvanized steel wire 3 and the nozzle 13 is arbitrary, and the effect which is the objective of this invention can be expressed even if it is any angle. For example, as shown in FIG. 9, the vertical angle β between the hot dip galvanized steel wire 3 and the nozzle 13 may be about 30 ° as shown in the nozzle 13X and is shown in the nozzle 13Y. It may be about 90 ° as shown.

  FIG. 9 is a schematic explanatory view of the nozzle 13 in the direction perpendicular to the bath surface of the molten aluminum plating bath 11 in one embodiment of the method for producing the molten aluminum plated steel wire shown in FIG.

  For example, as shown in FIG. 1, the inert gas can be supplied from the inert gas supply device 14 to the nozzle 13 via the pipe 15. In order to adjust the flow rate of the inert gas, for example, a flow rate control device (not shown) such as a valve may be provided in the inert gas supply device 14 or in the pipe 15.

  An inert gas means a gas that is inert to the molten aluminum. Examples of the inert gas include nitrogen gas, argon gas, helium gas, and the like, but the present invention is not limited to such examples. Of the inert gases, nitrogen gas is preferred. Note that the inert gas may contain, for example, oxygen gas, carbon dioxide gas, or the like within a range that does not impair the object of the present invention.

  The pressure of the inert gas discharged from the tip 13a of the nozzle 13 is adjusted to 0.1 to 25 kPa. In the present invention, when the steel wire 2 is immersed in the molten aluminum plating bath 1 and then pulled up from the molten aluminum plating bath 1, the bath surface of the molten aluminum plated steel wire 3 and the molten aluminum plating bath 1 from the tip 13 a of the nozzle 13. Since the pressure of the inert gas for spraying on the boundary with 11 is adjusted to 0.1 to 25 kPa, the thickness difference between the thick part and the thin part of the plating film 19 is large. Can be obtained, and a hot-dip galvanized steel wire 3 can be obtained in which almost no aluminum lump adheres to the surface.

  The pressure of the inert gas discharged from the tip 13a of the nozzle 13 is 0.1 kPa or more and the thickness of the plating film 19 is thick from the viewpoint of obtaining a molten aluminum-plated steel wire 3 with almost no aluminum lump attached to the surface. From the viewpoint of obtaining a hot-dip aluminum-plated steel wire 3 in which the thickness difference between the portion and the thin portion is large, and an uneven thickness portion is hardly generated. is there.

  Note that the pressure of the inert gas discharged from the tip 13a of the nozzle 13 is made of stainless steel having an inner diameter of 0.5 mm in the inert gas in the nozzle 13 at a distance of 2 mm from the tip 13a of the nozzle 13. The tube is inserted so that the tip of the tube and the tip 13a of the nozzle 13 are opposed to each other, and the gas pressure of the inert gas applied to the tip of the tube is measured with a pressure sensor.

  The volume flow rate of the inert gas discharged from the tip 13a of the nozzle 13 is preferably 2 L (liter) / min or more from the viewpoint of efficiently preventing oxidation of the meniscus 18 of the molten aluminum plating bath 1 shown in FIG. More preferably, it is 5 L / min or more, and more preferably 10 L / min or more, and there is almost no uneven thickness portion where the difference in thickness between the thick portion and the thin portion of the plating film 19 is large, and aluminum lump is formed on the surface. From the viewpoint of obtaining a hot-dip aluminum-plated steel wire 3 that hardly adheres, it is preferably 200 L / min or less, more preferably 150 L / min or less, and even more preferably 100 L / min or less.

  As for the temperature of the inert gas discharged from the tip 13a of the nozzle 13, there is almost no uneven thickness portion where the thickness difference between the thick portion and the thin portion of the plating film 19 is large, and there is almost no aluminum lump on the surface. From the viewpoint of obtaining a hot-dip aluminized steel wire 3 that does not adhere, it is preferably 10 ° C. or higher, more preferably 20 ° C. or higher, and further preferably 30 ° C. or higher. From the viewpoint of improving thermal efficiency, preferably 800 ° C. or lower, more preferably Is 780 ° C. or lower, more preferably 750 ° C. or lower.

  Note that the temperature of the inert gas discharged from the tip 13a of the nozzle 13 is, for example, a sheath thermoelectric having a diameter of 1.6 mm in the inert gas at a distance of 2 mm from the tip 13a of the nozzle 13. It is a value when measured by inserting a thermocouple for temperature measurement such as a pair.

  The pulling speed when pulling up the molten aluminum plated steel wire 3 from the bath surface 11 of the molten aluminum plating bath 1 is not particularly limited, and is present on the surface of the molten aluminum plated steel wire 3 by appropriately adjusting the pulling speed. Since the thickness of the plated coating 19 can be adjusted, it is preferable to adjust appropriately according to the thickness of the plated coating 19.

  In addition, in order to cool the molten aluminum plated steel wire 3 in the process of pulling up the molten aluminum plated steel wire 3 and solidify the plating film 19 formed on the surface efficiently, as shown in FIG. As shown in FIG. 1, a cooling device 16 may be disposed above the nozzle 13. In the cooling device 16, the molten aluminum plated steel wire 3 can be cooled by spraying, for example, gas, liquid mist or the like onto the molten aluminum plated steel wire 3.

  As shown in FIG. 1, the hot-dip aluminized steel wire 3 manufactured as described above can be collected by, for example, a winding device 17.

  The thickness of the plating film existing on the surface of the hot-dip aluminum-plated steel wire 3 suppresses the exposure of the base steel wire 2 during stranded wire processing, caulking processing, and the like, and mechanically per unit diameter. From the viewpoint of increasing strength, it is preferably about 5 to 10 μm.

  The minimum thickness of the thin portion of the plating film existing on the surface of the hot-dip aluminum-plated steel wire 3 suppresses the exposure of the base steel wire 2 during stranded wire processing, caulking processing, etc., and has a unit diameter. From the viewpoint of increasing the mechanical strength, it is preferably 1 μm or more, more preferably 2 μm or more.

  The uneven thickness index of the hot-dip aluminum-plated steel wire 3 is such that an uneven thickness portion where the difference in thickness between the thick portion and the thin portion of the plating film is large is unlikely to occur, and an aluminum lump is difficult to adhere to the surface. From the viewpoint of efficiently producing a plated steel wire, it is preferably 10 or less, more preferably 8 or less, and even more preferably 4 or less.

The uneven thickness index of the hot-dip aluminum-plated steel wire 3 is an index indicating the uniformity of the plating film of the hot-dip aluminum-plated steel wire 3. The thickness deviation index of the hot-dip aluminum-plated steel wire 3 is calculated from the maximum thickness and the minimum thickness of the plating film by the formula:
[Uneven thickness index] = [Maximum thickness] / [Minimum thickness]
Is a value obtained based on

  The hot-dip aluminized steel wire 3 obtained above may be subjected to wire drawing using a die or the like, if necessary, so as to have a desired outer diameter.

  The hot-dip aluminum-plated steel wire obtained by the method for manufacturing hot-dip aluminum-plated steel wire of the present invention can be suitably used for, for example, an automobile wire harness.

  EXAMPLES Next, although this invention is demonstrated further in detail based on an Example, this invention is not limited only to this Example.

Examples 1-67 and Comparative Examples 1-6
In each example and each comparative example, a hot dip galvanized steel wire was manufactured based on the embodiment of the method of manufacturing the galvanized steel wire shown in FIG.

  Steel wires having the diameters shown in the following tables as the steel wires and made of the steel types shown in each table, and the surface of the steel wires not subjected to galvanizing treatment (of "pre-Zn" in each table) Columns with “No” in the column) or those having a galvanized film with an average thickness of 5 μm or less (indicated with “Presence” in the “Pre-Zn” column of each table) were used. 37A described in the column of steel type in each table means a steel wire made of hard steel containing 0.37% by mass of carbon.

  The steel wire not subjected to galvanization was degreased by dipping in a sodium orthosilicate degreasing solution to which a surfactant was added before dipping in the molten aluminum plating bath.

  Further, before the steel wire was immersed in the molten aluminum plating bath, the steel wire was passed through the steel wire introduction part control device 8 shown in FIG. 2, and the steel wire was preheated to about 400 ° C. by the heating device 6. Nitrogen gas was used as the heating gas. The preheating temperature of the steel wire was measured by preparing a steel wire connected to a thermocouple and passing the thermocouple together with the steel wire through a heating device 6 maintained at a predetermined temperature.

  Moreover, as the bath surface control apparatus 7 used for the steel wire introduction part control apparatus 8 shown in FIG. 2, as shown in FIG. 3, the opening 9b and the discharge opening in the introduction port of the through hole 9a of the tubular body 9 are provided. The ratio of the area of the opening 9b of the through hole of the tubular body 9 and the area of the cross section of the steel wire [tubular body] is used, with the bath surface control device 7 having the same shape, size and area of the opening 9c. 9 is set to 57, and the steel wire is immersed in a molten aluminum plating bath for 0.3 to 1 second via the bath surface control device 7. I let you.

  As a molten aluminum plating bath, a molten aluminum plating bath (aluminum purity: 99.7% or more, indicated as “Al” in the column of “type of molten Al plating” in each table), a molten containing 4% by mass of silicon Aluminum plating bath (indicated as “4% Si” in the “Type of molten Al plating” column in each table), molten aluminum plating bath containing 8% by mass of silicon (“Type of molten Al plating” in each table) Column, “8% Si”), a molten aluminum plating bath containing 11% by mass of silicon (indicated as “11% Si” in the “type of molten Al plating” column in each table), or 13% by mass Using a molten aluminum plating bath containing silicon (indicated as “13% Si” in the column of “type of molten Al plating” in each table), the wire speed (steel wire) shown in each table at the bath temperature shown in each table At the lifting speed) After immersion line in the molten aluminum plating bath, raised from the molten aluminum plating bath.

  A dipping member (diameter: 300 mm, material: carbon steel for machine structure S55C) is dipped in a molten aluminum plating bath, and the shortest length L2 from the bath surface of the molten aluminum plating bath to the contact point between the dipping member and the steel wire is 450 mm. The immersion member was brought into contact with a steel wire immersed in a molten aluminum plating bath.

  The stabilizing member is brought into contact with the bath surface and the molten aluminum plating steel wire at the boundary between the molten aluminum plating steel wire pulled up from the molten aluminum plating bath and the bath surface of the molten aluminum plating bath, and the stabilizing member is subjected to molten aluminum plating. The amount of slide L1 in the horizontal direction of the hot-dip aluminum-plated steel wire when pressing the steel wire against the hot-dip aluminum-plated steel wire was 30 mm. Thereby, the value of the ratio (L1 / L2) between the horizontal sliding amount L1 of the steel wire and the shortest length L2 from the bath surface of the molten aluminum plating bath to the contact point between the immersion member and the steel wire is 0.067. It was adjusted to. In addition, the contact length of a plated steel wire and a stabilization member was adjusted to 5 mm using the square bar made from stainless steel by which the heat-resistant cloth material was wound on the surface as a stabilization member.

  Further, in order to be able to spray an inert gas to the boundary portion between the hot-dip aluminum-plated steel wire and the stabilizing member, each of the nozzle tips is positioned at a location 2 mm away from the hot-dip aluminum-plated steel wire. A nozzle having an inner diameter at the tip shown in the table is provided, and an inert gas (nitrogen gas) adjusted to the temperature shown in each table from the tip of the nozzle is hot-dip galvanized steel wire at the volume flow rate and pressure shown in each table And sprayed on the boundary between the hot-dip aluminum plating bath and the bath surface.

  The stabilizing member is arranged in parallel with the bath surface of the molten aluminum plating bath, the discharge direction of the inert gas discharged from the tip of the nozzle, and the direction in which the stabilizing member is in contact with the molten aluminum plated steel wire The angle between them (angle γ shown in FIG. 8) was 180 °, that is, the positions of both were adjusted so that the nozzle and the stabilizing member face each other. Further, the angle between the hot-dip aluminized steel wire and the nozzle (angle β shown in FIG. 9) was set to 90 °.

  By performing the above operation, a hot dip galvanized steel wire having a plating film with an average thickness shown in each table was obtained.

  Next, as the performance of the hot-dip aluminized steel wire, the adhesion of the aluminum block and the uniformity of the plating film were examined based on the following methods. The results are shown in each table.

[Adhesion of aluminum lump]
A hot-dip aluminum-plated steel wire having a length of 300 m is run at a line speed of 100 m / min, the outer diameter of the hot-dip aluminum-plated steel wire is measured over the entire length of the hot-dip aluminum-plated steel wire, and the outer diameter increases locally. The presence or absence of convex portions is examined. It was visually observed whether or not the aluminum lump was attached to the convex portion having a locally large outer diameter, and the adhesion of the aluminum lump was evaluated based on the following evaluation criteria.
(Evaluation criteria)
○: Adhesion of aluminum lump is not recognized.
X: Adhesion of aluminum lump is recognized.

[Uniformity of plating film]
In order to obtain the maximum thickness and the minimum thickness of the plating film, the cross section of the hot dip galvanized steel wire was observed. More specifically, a 300 mm test specimen was arbitrarily cut out from a hot-dip aluminized steel wire, and after six test pieces were further cut out from the test specimen, the test specimen was embedded in a resin and embedded. By cutting the resin and polishing the cut surface, the cross section of the hot-dip aluminized steel wire was exposed. This cross section was observed with an optical microscope (magnification: 500 times), and the maximum thickness and the minimum thickness of the plating film were measured. The average value of the maximum thickness of the plating film of the six test pieces is defined as the maximum thickness of the plating film, and the average value of the minimum thickness of the plating film of the six test pieces is defined as the minimum thickness of the plating film. did.

From the maximum thickness and the minimum thickness of the plating film obtained above, the formula:
[Uneven thickness index] = [Maximum thickness] / [Minimum thickness]
The uneven thickness index was determined based on the above, and the uniformity of the plating film was evaluated based on the following evaluation criteria.
(Evaluation criteria)
◎: Unevenness index is 4 or less ○: Unevenness index exceeds 4 and 10 or less ×: Unevenness index exceeds 10

〔Comprehensive evaluation〕
Based on the evaluation results of the adhesion of the aluminum block and the uniformity of the plating film, a comprehensive evaluation was performed according to the following evaluation criteria.
(Evaluation criteria)
(Double-circle): The evaluation of the adhesiveness of an aluminum lump is (circle), and the evaluation of the uniformity of a plating film is (double-circle) (excellent).
◯: All evaluations of adhesion of aluminum lump and plating film are ◯ (excellent).
X: In the evaluation of the adhesiveness of an aluminum lump and a plating film, either is x (failed).

Examples 68-91 and Comparative Examples 7-12
In Example 7, the horizontal slide amount L1 of the molten aluminum plated steel wire when the stabilizing member is pressed against the molten aluminum plated steel wire and the contact point between the immersion member and the steel wire from the bath surface of the molten aluminum plating bath The shortest length L2 was changed as shown in Table 7 and Table 8 to obtain a hot-dip aluminized steel wire having a plating film. Using the obtained hot-dip aluminum-plated steel wire, the adhesion of the aluminum lump and the uniformity of the plating film were examined in the same manner as in Example 7 as the performance of the hot-dip aluminum-plated steel wire. The results are also shown in Table 7 and Table 8.

Examples 92-115
In Example 7, the nozzle angle on the vertical surface (angle β shown in FIG. 9; hereinafter referred to as angle β), the angle of the stabilizing member on the vertical surface (angle α shown in FIG. 7; hereinafter referred to as angle α) and The average thickness shown in Table 9 is the same as in Example 7 except that the angle between the nozzle and the stabilizing member (angle γ shown in FIG. 8; hereinafter referred to as angle γ) is changed as shown in Table 9. And the hot dip galvanized steel wire in which the plating film which has the minimum thickness of a thin part was formed was obtained. The performance of the hot dip aluminized steel wire obtained above was examined in the same manner as in Example 7. The results are shown in Table 9.

Examples 116-137
In Example 7, the angle (angle α) of the stabilizing member on the vertical surface was set to 90 °, and the nozzle angle (angle β) on the vertical surface and the angle between the nozzle and the stabilizing member (angle γ) are shown in Table 10. A hot-dip galvanized steel wire on which a plating film having the average thickness and the minimum thickness of the thin portion shown in Table 10 was formed was obtained in the same manner as in Example 7 except that changes were made as shown. The performance of the hot dip aluminized steel wire obtained above was examined in the same manner as in Example 7. The results are shown in Table 10.

Examples 138-159
In Example 7, the angle (angle β) of the nozzle on the vertical surface was set to 90 °, and the stabilization member angle (angle α) of the vertical surface and the angle between the nozzle and the stabilization member (angle γ) are shown in Table 11. A hot-dip galvanized steel wire on which a plating film having the average thickness and the minimum thickness of the thin portion shown in Table 11 was formed was obtained in the same manner as in Example 7 except that changes were made as shown. The performance of the hot dip aluminized steel wire obtained above was examined in the same manner as in Example 7. The results are shown in Table 11.

  From the above results, according to each example, molten aluminum in which the difference in thickness of the plating film between the thick part and the thin part of the plating film is not likely to occur and aluminum lump is difficult to adhere to the surface. It can be seen that plated steel wire can be manufactured efficiently.

  The hot-dip aluminized steel wire obtained by the production method of the present invention can be suitably used for, for example, an automobile wire harness.

DESCRIPTION OF SYMBOLS 1 Molten aluminum plating bath 2 Steel wire 3 Molten aluminum plating steel wire 4 Delivery apparatus 5 Plating bath 6 Heating apparatus 7 Bath surface control apparatus 8 Steel wire introduction part control apparatus 9 Tubular body 9a Through-hole 9b Immersion area 9c Inlet 9d Opening 9e Discharge port 9f Opening part 10 Immersion member 11 Bath surface of molten aluminum plating bath 12 Stabilization member 12 Stabilization member 12A Stabilization member 12B Stabilization member 12C Stabilization member 12D Stabilization member 12E Stabilization member 12F Stabilization member 12a Heat-resistant cloth material 13P nozzle 13Q nozzle 13R nozzle 13S nozzle 13X nozzle 13Y nozzle 13a Nozzle tip 14 Inert gas supply device 15 Piping 16 Cooling device 17 Winding device 18 Meniscus 18a Meniscus tip 19 Plating film

Claims (3)

After dipping a steel wire in a molten aluminum plating bath, a molten aluminum plated steel wire is manufactured by continuously pulling the steel wire from the molten aluminum plating bath through a dipping member immersed in the molten aluminum plating bath. A way to
Bringing the stabilizing member into contact with the bath surface of the molten aluminum plating bath and the molten aluminum plated steel wire at the boundary between the molten aluminum plating steel wire pulled up from the molten aluminum plating bath and the bath surface of the molten aluminum plating bath; The horizontal slide amount L1 of the molten aluminum plated steel wire when the stabilizing member is pressed against the molten aluminum plated steel wire and the shortest length from the bath surface of the molten aluminum plating bath to the contact point between the immersion member and the steel wire The ratio of L2 (L1 / L2) is adjusted to 0.006 to 0.2,
A nozzle for spraying an inert gas on the boundary between the hot-dip aluminum-plated steel wire and the stabilizing member is disposed, and the inert gas is applied to the boundary from the tip of the nozzle at a pressure of 0.1 to 25 kPa. A method for producing a hot-dip aluminized steel wire, characterized by spraying.   The method for producing a hot-dip galvanized steel wire according to claim 1, wherein the steel wire is a steel wire made of carbon steel or stainless steel.   The manufacturing method of the hot dip aluminum plating steel wire of Claim 1 or 2 which adjusts the temperature of a hot dip aluminum plating bath so that it may become 25 degreeC or more higher than melting | fusing point of the said hot dip aluminum plating bath.

Images