KR20070009153A - Zinc-plating method of wire - Google Patents

Abstract

A method for hot dip galvanizing of an iron wire is provided to equally maintain the heat treatment state of the iron wire at an inner side and an outer side of a bobbin in an annealing step, and reduce an entire galvanizing process and continuously proceed the galvanizing process from a wire drawing step to a coiling step at the same time by excluding a pickling step using hydrochloric acid. A method for hot dip galvanizing of an iron wire comprises: a wire drawing step of drawing an iron wire(14) through a wire drawing machine(10); an annealing and oxidation preventing step of feeding a strand of an iron wire passing through the wire drawing step between a positive electricity applied positive conduction roller(62) and a negative electricity applied negative conduction roller(65) to heat the iron wire, and preventing oxidation of the iron wire and annealing the iron wire at the same time by injecting nitrogen(N) gas into a through pipe(61) through which the iron wire passes, and which installed between the positive conduction roller and the negative conduction roller to prevent blackening of the iron wire due to oxidation generated during heating of the iron wire; a galvanizing step of transferring an iron wire passing through the annealing and oxidation preventing step as long as a natural cooling distance(L) to cool the iron wire in the air, and dipping the iron wire into a zinc solution(51) along transfer rollers(52) of a galvanizing tank(50) to galvanize the iron wire; and a coiling step of coiling an iron wire passing through the galvanizing step on a bobbin(20).

Description

Zinc-plating method of wire

1 is a flow chart of a conventional hot dip galvanizing method of iron wire

2 and 3 is a perspective view showing a hot dip galvanizing method of the conventional iron wire

4 is a flow chart of a hot dip galvanizing method of iron wire according to the present invention

5 is a schematic view showing a hot dip galvanizing method of the iron wire according to the present invention.

Figure 6 is a perspective view showing a molten zinc plating method of the iron wire according to the present invention

<Description of Symbols for Major Parts of Drawings>

10: fresh machine

11: drum

12: Die holder

13: Die

14: iron wire

20 Bobbin

30: annealing furnace

40: pickling bath

41 hydrochloric acid solution

42: feed roller

50: zinc plating tank

51: zinc solution

52: feed roller

60: annealing machine

61: through tube

62: challenge roller

63: Brush

64: wires

65: challenge roller

66: support roller

L: Natural Cooling Distance

S110: Fresh Step

S120: Annealing Step

S130: Pickling Step

S140: Zinc Plating Step

S150: winding step

S200, S300: discontinuous work movement step

S410: Fresh Step

S420: Annealing and oxidation prevention step

S430: Zinc Plating Step

S440: winding step

The present invention relates to a method for plating molten zinc on an iron wire. Iron wires tend to oxidize in the air and oxidize, and it is common practice to plate zinc to protect them from corrosion for a long time.

When zinc is plated on the iron wire 14, the zinc plated layer prevents corrosion of the iron wire 14.

Such zinc plating methods include hot dip galvanizing, electroplating, ceradiating, and metallic silicon, but hot dip galvanizing takes up most of the method.

The iron wire is made by drawing processing, which is one of plastic working, and in particular, drawing of fine iron wire 14 having an outer diameter of 5 mm or less is called drawing.

1 is a flow chart of a conventional hot dip galvanizing method of the iron wire 14 drawn by the drawing machine 10, the drawing step (S110), annealing step (S120), pickling step (S130), zinc plating step as shown in FIG. (S140) and take-up step (S150), but between the drawing step (S110) and the annealing step (S120) the discontinuous work movement step of the fresh wire to move the fresh wire 14 to the annealing furnace 30 ( S200) step is added, and the discontinuous work movement step (S300) of the annealed iron wire, which transfers the annealed iron wire 14 to the pickling tank 40, between the annealing step (S120) and the pickling step (S130). Bar, the work of continuous flow did not proceed in the whole process, and it was carried out as discontinuous work.

2 and 3 illustrate this conventional method in a step-by-step perspective view. First, the drawing machine 10 of FIG. 2 passes to produce a smaller diameter wire 14 from the first wire 14 to be inserted. The die 13 having different holes is provided in the die holder 12 in multiple stages, while the front and rear die holders 12 have a multi-stage drum 11 having an outer diameter gradually increasing, that is, two It is composed of one set to apply the pulling force.

As shown in FIG. 2, the tapered iron wire 14 passing through the drawing machine 10 is wound around the bobbin 20 (Bobbin), and the step up to this point is called the drawing step S110.

The wire 14, which has undergone the drawing step (S110), passes through the work moving step (S200), which is moved to the inside of the annealing furnace 30 while being wound on the bobbin 20, and is provided with ductility in the annealing furnace 30. At the same time, the internal stress is removed and heat treated with a more stable material. This step is referred to as annealing step (S420).

However, the iron wire 14 is annealed in the state wound around the bobbin 20, the iron wire 14 of the inside and outside of the bobbin 20 has a structural problem that the annealing state can only be different.

The iron wire 14, which has undergone the annealing step (S120), is blackened while being oxidized during heat treatment, and the blackened iron wire 14 is moved to the pickling bath 40 for washing. After going through the (S300), the pickling step is immersed in the pickling tank 40 (S130).

The iron wire 14 unwound by one strand in the bobbin 20 is removed by the blackened impurities while passing through the hydrochloric acid solution 41 on the transfer roller 42 of the pickling bath 40.

However, the hydrochloric acid used in the pickling step (S130) requires careful handling because of its irritating smell and toxicity, and it will be said to adversely affect not only the worker but also the environment.

The iron wire 14 passed through the pickling step S130 is plated while being immersed in the zinc solution 51 by the transfer roller 52 of the zinc plating tank 50. The plated iron wire 14 is wound on the bobbin 20 again, which is referred to as a zinc plating step (S140) and a winding step (S150).

Problems of the conventional galvanizing method of the iron wire 14 as described above is that the heat treatment characteristics of the inner and outer steel wire 14 of the bobbin 20 through the annealing step (S120) is different from each other, the human body and the environment The harmful hydrochloric acid is used in the pickling step (S130), the entire process from the drawing step (S110) to the winding step (S150) does not proceed to a continuous flow operation, annealing the iron wire 14 through the drawing step (S110) It is pointed out that the problem is that it is a discontinuous process to move to the step (S120), and also to move the bobbin 20 passed through the annealing step (S120) to the pickling step (S130).

Therefore, the present invention was devised in view of the above-described problems, and in the annealing step to maintain the same heat treatment state of the inner and outer iron wire of the bobbin, and to remove the pickling step in which hydrochloric acid harmful to the human body and the environment is used as a whole. The present invention aims to provide a hot dip galvanizing method of iron wire which can reduce the galvanizing process and at the same time discontinuously proceed the plating process from the drawing stage to the winding stage.

Hereinafter, with reference to the accompanying drawings, a method and effects of a preferred embodiment that can achieve the object of the present invention will be described.

Figure 4 is a flow chart of the hot dip galvanizing method of the iron wire according to the present invention. As shown in FIG. 4, the present invention includes a drawing step (S410), annealing and oxidation prevention step (S420), a zinc plating step (S430), and a winding step (S440).

The drawing step (S410) is a step of drawing the wire 14 to the desired thickness through the drawing machine 10, the same as the above-described conventional drawing step (S110) will be omitted.

The characteristics of the present invention is that the heat treatment state of the iron wire 14 supplied during annealing is the same, the conventional pickling step (S130) using the pickling bath 40 is shortened the zinc plating process, and before galvanizing The process is continuous.

This feature of the invention is well illustrated in FIGS. 5 and 6. 5 is a schematic view showing a hot dip galvanizing method of the iron wire 14 according to the present invention, Figure 6 is a perspective view showing a hot dip galvanizing method of the iron wire 14 according to the present invention.

As shown in FIGS. 5 and 6, the wire 14 drawn finely in the drawing step S410 is supplied to the annealing unit 60 in one strand of the drawn state.

The wire strand 14 supplied is heat-treated in the process of being transported on the conductive (+) roller 62, the conductive (-) roller 65 and the support roller 66 of the annealing device 60.

That is, the carbon brush 63 is installed in the conductive roller 62, the electric wire 64 is connected, and then positive electricity is applied, and the carbon brush 63 is applied to the conductive roller 65. When the electric wire is connected to the wire 64 and the (-) electricity is applied, the electric current flows through the electric wire 14 passing between the conductive roller 62 and the conductive roller 65 to generate heat. do.

In the process of heating and slow cooling of the iron wire 14, the structure becomes fine, ductility is given and the internal stress is removed.

Conventional annealing step (S120) was heated in the annealing furnace 30 with the bobbin 20 as a whole, there was a problem that the heat treatment state of the inner and outer iron wire 14 wound on the bobbin 20, there is a different problem, the present invention In the annealing step (S420) of the iron wire 14 is continuously supplied by one strand so that the heat treatment state of the iron wire 14 is maintained the same.

On the other hand, the iron wire 14 is oxidized when it is heated to become black wire, and in order to remove the blackened portion of the iron wire 14, in order to remove the iron wire 14, an immersion pickling step using hydrochloric acid. (S130), but in the present invention to shorten the process by reducing the pickling step (S130) and to reduce the investment in the facility, at the same time the annealing step (S120) and the wire 14 is a process for preventing oxidation.

That is, the through tube 61 of the iron wire 14 is provided between the conductive roller 62 and the conductive roller 65, and the conductive roller 62 and the conductive roller ( When nitrogen (N) gas is injected into the iron wire 14 which is blackening while being oxidized with heating between 65), oxidation of the iron wire 14 is prevented by the chemical reaction of nitrogen to block the blackening phenomenon. .

Nitrogen (N) deoxygenation chemical equation is "FeO (iron oxide) + N (nitrogen) = No (acid nitrogen) + Fe (clean iron)"

According to the above formula, even though the iron wire 14 passes through the annealing unit 60, the iron wire 14 is discharged to the iron wire 14 in which blackening does not proceed by injection of nitrogen gas. Nitric oxide is a stable gas that is harmless to humans and the environment.

The iron wire 14 passed through the annealing device 60 is plated while being immersed in the zinc solution 51 by the transfer roller 52 of the zinc plating tank 50. The plated iron wire 14 is wound on the bobbin 20 again, which is referred to as a zinc plating step (S430) and a winding step (S440).

In FIGS. 5 and 6, a natural cooling distance L is set between the annealing device 60 and the galvanizing bath 50, which considers the heated iron wire 14 to be naturally cooled in the air. In order to obtain the best plating state based on the phenomenon that the adhesion of zinc plating varies depending on the temperature of the iron wire 14 flowing into the tank 50, the inlet temperature of the iron wire 14 is adjusted by adjusting the natural cooling distance (L). To control.

As described above, the present invention is to continuously proceed the entire process of the hot dip galvanizing method of the iron wire 14 from the drawing step (S410) to the winding step (S440), depending on the site conditions the drawing step (S410) To proceed separately and only proceed continuously from the annealing step (S420) to the winding step (S440).

As a result, the technical gist of the present invention is in the state of stranding the wire 14 through a drawing step (S410) and the drawing step (S410) to draw the wire 14 through the drawing machine (10) +) Electricity is supplied between the electrically conductive (+) roller 62 and the (-) electricity applied conductive (-) roller 65 to be heated, and blackening of the iron wire 14 due to oxidation during heating is performed. In order to prevent the iron wire 14 by injecting nitrogen (N) gas into the through pipe 61 is installed so that the iron wire 14 penetrates between the conductive (+) roller 62 and the conductive (-) roller (65). Annealing and oxidation prevention step (S420) which simultaneously prevents oxidation and annealing of the

The iron wire 14, which has undergone the annealing and oxidation prevention step (S420), is transferred by a natural cooling distance (L), cooled in air, and immersed in the zinc solution (51) by the transfer roller (52) of the zinc plating tank (50). The galvanizing step (S430) to be plated, and the winding step (S440) of winding the iron wire 14 through the galvanizing step (S430) to the bobbin 20 is a hot-dip galvanizing method of the iron wire, characterized in that made continuously. .

As described above, since the wire is not blackened in the annealing step, the pickling step using the conventional hydrochloric acid can be excluded, thereby reducing the overall process and reducing the facility investment. In addition, during annealing, the wires are annealed by unwinding them into one strand from the bobbin, thereby obtaining iron wires having the same heat treatment.

Claims (1)

A drawing step (S410) of drawing the wire 14 through the drawing machine 10 finely; In the stranded state of the wire 14 through the drawing step (S410) is supplied between the conductive (+) roller 62 is applied (+) electricity and the conductive (-) roller (65) is applied (-) Heating, In order to prevent blackening of the iron wire 14 due to oxidation during heating, the inside of the through tube 61 installed so that the iron wire 14 penetrates between the conductive roller 62 and the conductive roller 65. An annealing and oxidation prevention step (S420) for simultaneously injecting nitrogen (N) gas into the iron wire 14 to prevent oxidation and annealing; The iron wire 14, which has undergone the annealing and oxidation prevention step (S420), is transferred by a natural cooling distance (L), cooled in air, and immersed in the zinc solution (51) by the transfer roller (52) of the zinc plating tank (50). Zinc plating step (S430) to be plated; Hot-dip galvanizing method of iron wire, characterized in that the winding step (S440) of winding the iron wire (14) through the galvanizing step (S430) to the bobbin (20) successively.

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