KR20130062185A - Ingot feeding equipment and method of manufacturing in continuous hot-dip galvanized steel sheet for outer panel - Google Patents

Abstract

PURPOSE: A device and a method for charging an ingot to improve on mixing of ashes of a plated steel for an outer panel are provided to suppress to swing in bath surface generated when charging the ingot and to minimize fault of the surface in which the ash is mixed. CONSTITUTION: A device for charging an ingot comprises a plating bathtub(50), a holder(100) in a box shape, a settling rod(120), and an ingot supply member. The holder is installed in the inside of the plating bathtub and is formed in a box shape which an upper part is opened with the size capable of accommodating the ingot. The settling rod is arranged across the holder and supports the bottom surface of the ingot. The ingot supply member includes a hanger(110) fixing and releasing the ingot and a transfer unit(80) transferring the hanger.

Description

INGOT FEEDING EQUIPMENT AND METHOD OF MANUFACTURING IN CONTINUOUS HOT-DIP GALVANIZED STEEL SHEET FOR OUTER PANEL}

The present invention relates to a hot-dip galvanized steel sheet and a method for manufacturing the same having excellent surface quality, and more particularly, to improve the ash surface incorporation of the hot-dip galvanized steel sheet used for automobile shell, The present invention relates to a technique for specifying a zinc ingot charging method in a plating bath of a steel plate and optimizing an ingot charging device of a continuous galvanizing line (CGL).

Hot-dip galvanized steel sheet used for automobile exterior plate is an important control point to avoid surface foreign matter mixing in the process of passing through the hot dip plating bath.

Particularly in the case of hot dip galvanizing, zinc is evaporated from the charged surface of the snout inner strip deposited in the plating bath to float as fine foreign matter (hereinafter referred to as ash), and then adhered to the inner wall of the snout. Ash falls to the bath surface and floats and enters the strip, causing plating failure.

Since such plating surface defects cause paint defects in the automobile manufacturing process and cause a fatal problem with the exterior plate material, suppressing ash mixing in the bath is a very important management item.

Since there is no way to block the zinc vapor evaporating from the inner surface of the snout, the technology to minimize the generation of zinc vapor and to prevent the generated vapor is incorporated in the strip surface in the form of Ash.

That is, a technique of suppressing the generation of zinc vapor on the inner surface of the snout and a technique of removing the generated ash are applied in combination. As a method of suppressing zinc vapor, there is a method of blocking evaporation of zinc by forming a fine oxide film on the inner surface. As a method of removing the generated ash, there are a method of discharging the atmosphere gas inside the snout and a method of discharging the melt on the surface of the snout through a pump in the bath.

However, as the plating process proceeds, the molten zinc must be supplied with a new zinc ingot. At this time, the zinc ingot (ingot) is charged into the molten metal, causing the surface to slump. Melt swelling occurs when the zinc ingot falls quickly or when the hanger supporting the zinc ingot detaches, and ash particles floating on the molten surface in the snout are mixed into the strip and cause surface defects. It acts as a fatal flaw in the quality of exterior panels.

An object of the present invention is to prepare a hot-dip galvanized steel sheet for the outer surface by minimizing the swelling of the bath surface when charging the zinc ingot into the hot dip galvanized bath to prevent the bath surface swelling in the snout so that Ash is not mixed in the strip. It is to provide a manufacturing apparatus and a manufacturing method that can be.

In addition, it is an object of the present invention to provide an optimum ingot charging apparatus and charging method in a continuous galvanizing line (hereinafter CGL).

The present invention provides a plating bath for accommodating molten metal; A box-shaped holder formed in the plating bath and having an open top at a size that can accommodate an ingot to be charged; An arthropod supporting the bottom surface of the ingot which is disposed across the cradle; And an ingot supply means having a hanger for fixing or releasing the ingot, and a transfer part for moving the hanger; It provides an ingot charging apparatus comprising a.

It is preferable that a plurality of settling rods are provided corresponding to the uneven shape of the bottom surface of the ingot, and the settling rod is more preferably arranged in a zigzag shape in the vertical direction. At this time, the anchor rod should be formed in a position spaced apart from the bottom surface of the cradle.

The cradle is provided with a communication hole through which the molten metal can communicate.

And, it is preferable that the transfer unit is capable of adjusting the lifting speed of the hanger to 2 ~ 3mm / sec.

The cradle and the mounting rod is preferably made of a heat resistant stainless steel that is not soluble in the molten metal.

In addition, the present invention is a method for charging the ingot in the plating bath containing the molten metal, formed in the inside of the plating bath and having a size that can accommodate the ingot to be charged and the top of the box-shaped cradle and the cradle Charging the ingot into the arbor rod formed to support the bottom surface of the ingot is placed across the place, characterized in that to control the ingot charging speed at a low speed of 2 ~ 3mm / sec so as not to shake the bath surface by ingot charging It provides an ingot charging method.

The charging of the ingot is made by a hanger for fixing or releasing the ingot, and a conveying part for transferring the hanger, and raising the hanger after charging the ingot, but the hanger ascending speed is increased so that the bath hanger does not occur due to the hanger rising. It is preferable to control at a low speed of ˜3 mm / sec.

The ingot charging apparatus according to the present invention blocks the strip and the charging ingot causing the plating reaction by the ingot holder in the plating bath so that the variation of aluminum components in the plating bath does not affect the surface quality of the plated steel sheet.

In addition, the ingot charging device and the ingot charging method according to the present invention minimizes the surface defects that the ash (sh), which is a floating foreign material in the snout into the strip, by suppressing the bath surface swell that is inevitably generated during the ingot charging, It is possible to manufacture a plated steel sheet for outer plate with excellent surface quality.

1 is a schematic view showing a hot dip galvanizing apparatus.
2 is a photograph in which a step is formed in the top dross on the right surface of the photograph by the surface of the bath.
3 is a configuration diagram showing an ingot charging apparatus of a plated steel sheet according to an embodiment of the present invention.
Figure 4 is a block diagram showing a flat structure of the ingot charging apparatus of the plated steel sheet according to an embodiment of the present invention.
5 is a cross-sectional view showing the operation sequence of the ingot charging apparatus of the plated steel sheet according to an embodiment of the present invention.

Hereinafter, an ingot charging apparatus and an ingot charging method for improving ash mixing of an outer plated steel sheet according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. Advantages and features of the present invention and methods for achieving them will be apparent with reference to the following detailed description in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various forms, and only the present embodiments are intended to complete the disclosure of the present invention, and the general knowledge in the art to which the present invention pertains. It is provided to fully convey the scope of the invention to those skilled in the art, and the present invention is defined only by the scope of the claims. Like reference numerals refer to like elements throughout.

1 is a schematic view showing a hot dip galvanizing apparatus.

The hot-dip galvanizing apparatus includes a sink roll 2, a stabilizer roll 4 formed on the sink roll 2 to prevent vibration of the strip, and a collecting roll formed below the stabilizer roll 4 ( Include 3).

The strip 1 enters the plating bath 5 through the snout 4 and is plated through the rolls sequentially. Since the molten metal in the plating bath 5 is reduced by the continuous plating, the ingot 9 corresponding to the molten metal decrease is supplied to maintain the flow rate of the molten metal.

Conventionally, the hanger 11 was supplied to the holder 10 formed on one side of the plating bath 5. However, each time the ingot 9 is supplied, the surface of the molten metal has a problem of causing surface quality defects.

2 is a photograph in which a step is formed in the top dross of the right surface of the photograph by the molten surface of the ingot when charging.

3 is a configuration diagram showing an ingot charging apparatus of a plated steel sheet according to an embodiment of the present invention, Figure 4 is a configuration diagram showing a flat structure of the ingot charging apparatus of a plated steel sheet according to an embodiment of the present invention.

As shown, the ingot charging apparatus according to the present invention, the plating bath 50 to accommodate the molten metal, the inside of the plating bath 50 has a size that can accommodate the ingot to be charged and the top is open Box-shaped cradle 100, a support rod 120 for supporting the bottom surface of the ingot 90 is disposed across the cradle 100 and the hanger for fixing or releasing the ingot 90 And an ingot supply means having a conveying part 80 for moving the hanger 110.

The ingot supply means according to the present invention picks up the ingot 90 to the hanger 110, and then horizontally moved by the transfer unit 80 to the upper portion of the plating bath 50, fall vertically from the upper portion of the plating bath 50 It charges the ingot into the molten metal.

In this case, when the ingot 90 is charged from the upper portion of the molten metal to the inside of the bathtub, the ingot 90 is manually operated and then the hanger is opened at a time, so that the ingot 90 of about one ton falls into the tub. Swearing causes slack. Such bathing surface swelling was mixed with the strips 1 of the bathing surface floating foreign material 7 of FIG.

The ingot supply means of the present invention hangers after seating the ingot 90 formed in the ingot holder 100 formed in the ingot holder 100 inside the plating bath 50 so that the bathing surface fluctuations do not occur when opening the hanger 110 It characterized in that the opening (110).

To this end, the length of the hanger 110 is made sufficiently longer than the upper support of the ingot 90 to seat the ingot on the settling rod 120 inside the plating bath 50, and then the hanger 110 is further lowered to its lower portion. It is desirable to open only the hanger itself.

Here, it is preferable that the mounting rod 120 is provided in multiple numbers corresponding to the uneven | corrugated shape of the bottom face of the said ingot. The ingot placed in the arthropod 120 is gradually melted, and is intended to prevent the ingot from being separated from the molten and separated from the arthropod 120. If the ingot 90 is separated to leave the anchor rod 120, because it may fall to the bottom of the cradle 100 may cause the rocking of the bath.

Therefore, it is preferable that the arranging rods 120 are arranged in a zigzag shape in the vertical direction so that the ingot 90 can be maintained in the arranging rods 120 even when the ingot 90 is separated into two or more pieces.

In addition, the mounting rod 120 is preferably formed at a position spaced apart from the bottom surface of the cradle 100. This is to ensure the area in contact with the molten metal ingot 90 seated on the mounting rod 120 and to facilitate the circulation of the molten metal.

Cradle 100 is provided with a communication hole through which the molten metal can communicate. Molten metal in the plating bath and the molten metal in the cradle 100 is to be circularly mixed to be mixed.

The cradle 100 has a box shape in which an upper portion capable of accommodating the ingot is open, and preferably, a heat-resistant stainless steel material having a thickness of 2.0 to 5.0 mm. This is to prevent the eluting from the high temperature atmosphere of the molten metal. If the thickness of the cradle 100 is less than 2mm, the components of the cradle 100 are eluted at a high temperature, and thus it is difficult to exert the blocking effect of the cradle and the ingot. In addition, when the thickness of the cradle 100 exceeds 5mm, the weight of the cradle 100 becomes heavy, which adversely affects the rigidity of the inner wall structure of the molten metal supporting the cradle 100.

The communication hole is preferably formed in the range of 100 ~ 300mm in diameter. This allows the molten metal to flow smoothly. If the diameter of the communication hole is less than 100mm, the fluidity in the molten metal is lowered if the diameter of the communication hole is lowered, and if the diameter of the communication hole exceeds 300mm, the atmosphere of the molten metal in the holder 100 is It is preferable to limit to the above range because it can act as a variation factor in the component and temperature.

The arthropod 120 is preferably made of heat-resistant stainless steel, similar to the cradle 100. This is to prevent the base rod 120 component from being melted in the hot melt. In consideration of the problem with the solution, it is preferable to install a heat-resistant stainless steel rod having a diameter of 50 to 150 mm.

Ingot apparatus according to the present invention is installed in the plating bath with a cradle 100 consisting of a heat-resistant steel partition, although the components of the ingot 90 charged to have a higher aluminum content than the bath component is formed in the top of the bath top In particular, it is possible to prevent the problem of incorporation into the inner surface of the snout while providing a fixation rod 120 made of a heat resistant steel strainless material so as not to cause bath surface fluctuation until the charged ingot is completely dissolved.

5 is a cross-sectional view showing the operation sequence of the ingot charging apparatus of the plated steel sheet according to an embodiment of the present invention. 5 is taken along the line A-A of FIG.

The present invention relates to a method for charging an ingot into a plating bath in which a molten metal is accommodated, the box-shaped cradle having a size that can accommodate an ingot formed in the plating bath and having an open top, and transversely the cradle. The ingot is charged into the settling rod formed to support the bottom surface of the ingot that is placed and settled, while controlling the ingot charging speed at a low speed of 2 ~ 3mm / sec so as not to shake the bath surface by ingot charging Provide a charging method.

The ingot charging apparatus and the ingot charging method provided by the present invention are composed of three items: a part for fastening the ingot, a falling speed control program of the ingot, and a part placed inside the bathtub of the ingot.

As shown in (a), the hanger 90 is lowered to the inside of the cradle 100 in a state supporting both sides of the ingot 90.

Next, as shown in (b), the bottom surface of the ingot 90 is in contact with the top surface of the mounting rod (120). The bottom surface of the ingot 90 is formed of an uneven surface and the arbor rod 120 is arranged in a zigzag in the vertical direction so as to correspond to the uneven shape of the bottom surface of the ingot 90.

Thereafter, as shown in (c), after the ingot 90 is settled, the hanger 110 is further lowered vertically downward from the ingot 90 settled under the condition that the ingot 90 remains stationary. By opening the hanger 110 to minimize the slack surface caused when opening the hanger 110. In order to settle the ingot 90 in this manner, it is preferable that the length of the hanger 110 has a length more than twice the height of the ingot 90.

As shown in (d), when opening of the hanger 110 is completed, the hanger is raised as shown in (e) to prepare for charging the next ingot.

As such, the method of lowering and opening the ingot using the hanger arm length becomes a very effective charging means in a high temperature container in which a proximity switch cannot be installed inside, such as zinc molten metal.

At this time, the descending speed of the hanger is set in the range of 2 ~ 3mm / sec, so as to prevent the bath surface rung which is likely to occur when the ingot suddenly enters the molten metal. This low-speed ingot charging method ensures that the zinc ingot stays in the top of the bath before it is charged in the molten metal, thereby preventing the explosion risk that may be caused when charging the inside of the bath if fine water remains on the zinc ingot surface. .

In addition, through the pre-heating of the charging ingot, the effect of preventing a sudden change in the bath temperature due to the zinc ingot charging can also be obtained incidentally. After the zinc ingot is settled in the molten metal, the speed of the hanger ascending should be set to 2 ~ 3mm / sec. This is because fluctuations in bathing habits can be caused by the withdrawal and withdrawal of the hanger itself.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. It will be understood that the invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive.

1, 10: strip 2, 20: sink roll
3, 30: Collecting roll 4, 40: Stabilizer roll
5, 50: plating bath 6, 60: snout
7, 70: floating foreign material 80: conveying part
9, 90: ingot 10, 100: holder
11, 110: hanger 120: Chichibong

Claims (10)

A plating bath containing a molten metal;
A box-shaped holder formed in the plating bath and having an open top at a size that can accommodate an ingot to be charged;
An arthropod supporting the bottom surface of the ingot which is disposed across the cradle; And
Ingot supply means having a hanger for fixing or releasing the ingot, and a transfer part for moving the hanger; Ingot charging apparatus comprising a.
The method of claim 1,
The anchor rod
Ingot charging apparatus, characterized in that provided in plurality in correspondence with the concave-convex shape of the bottom of the ingot.
3. The method of claim 2,
The ingot rod is ingot charging apparatus, characterized in that arranged in a zigzag form in the vertical direction.
The method of claim 1,
The anchor rod
Ingot charging apparatus, characterized in that formed in a position spaced from the bottom surface of the ingot.
The method of claim 1,
The cradle
Ingot charging apparatus, characterized in that the molten metal having a communication hole to communicate.
The method of claim 1,
The conveying portion
Ingot charging apparatus, characterized in that the adjustable lifting speed of the hanger to 2 ~ 3mm / sec.
The method of claim 1,
The hanger is ingot charging apparatus, characterized in that having a length more than twice the height of the ingot.
The method of claim 1,
The cradle and the base rod is an ingot charging apparatus, characterized in that the heat-resistant stainless steel material is not soluble in the molten metal.
A method for charging an ingot into a plating bath containing molten metal,
An ingot is formed in the plating bath and has an ingot formed in a box-shaped holder having a size that can accommodate an ingot to be charged, and an arthropod formed to support the bottom surface of the ingot being placed across the holder. The ingot charging method characterized in that the charging, but ingot charging speed is controlled at a low speed of 2 ~ 3mm / sec so as not to shake the bath surface by ingot charging.
The method of claim 9,
The charging of the ingot
A hanger for fixing or releasing the ingot, and a conveying part for transferring the hanger, and raising the hanger after charging the ingot, but the hanger ascending speed is increased to 2 to 3 mm / sec so that the bath surface is not shaken by the hanger rising. Ingot charging method characterized in that the control at low speed.

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