KR20200091984A - Pipe manufacturing apparatus using color steel sheet and pipe manufacturing method using the same - Google Patents

Abstract

The present invention relates to a color pipe manufacturing apparatus using a color steel sheet and a manufacturing method thereof. The purpose of this invention is to reduce costs and time required for the production of a final product by enabling continuous pipe painting work in a pipe manufacturing line for manufacturing a color pipe by using a color steel sheet. To achieve this purpose, the color pipe manufacturing apparatus using a color steel sheet includes: an uncoiler continuously supplying a strip-shaped color steel sheet to which paint of a specific color is applied; a molding machine molding the strip gradually into a round shape through a plurality of molding rollers; and a high-frequency welder continuously welding pipe joints. The apparatus also includes a spray-painting facility or a roller painting facility for painting a part having a paint film peeled by high-frequency welding by using high-speed drying paint on a pipe manufacturing line. Therefore, the apparatus is capable of continuously producing color pipes on a series of pipe manufacturing lines.

Description

Color pipe manufacturing apparatus using color steel sheet and its manufacturing method{PIPE MANUFACTURING APPARATUS USING COLOR STEEL SHEET AND PIPE MANUFACTURING METHOD USING THE SAME}

The present invention relates to an apparatus for manufacturing a color pipe using a color steel sheet coated with a specific color of paint, and a method for manufacturing the same, and more specifically, to a pipe pipe line for manufacturing a pipe by forming a color steel sheet and welding it. By installing the coating equipment one after another and applying the quick-drying paint by the spray method or the roller coating method using the heat of the pipe heated by welding, the color steel sheet that does not need to be transported and coated by a separate coating line It relates to a used color pipe manufacturing apparatus and its manufacturing method.

Among the methods of manufacturing a steel pipe, there is a method of continuously manufacturing a color pipe by welding a joint after forming a strip-shaped steel sheet in a round shape.

1 schematically illustrates the above-described color pipe manufacturing process.

In the conventional pipe manufacturing method, as shown in FIG. 1, a process of forming and welding a steel sheet (hereinafter referred to as a “coating process”) and a process of painting a pipe having completed coping (hereinafter referred to as a “coating process”). This process is completely separate.

First, the pipe manufacturing process, as shown in Figure 1a, the step of supplying a color steel sheet (S10), forming a steel sheet (S20), performing a high-frequency welding (S12), and removing the beads ( S13), spraying step (S14), anti-corrosion coating step (S15), cutting and brushing step (S16), and comprises a step (S18) of transferring to the coating plant.

In the step (S10) of supplying the color steel sheet, the color steel sheet is cut to a width corresponding to the circumference of the pipe to be manufactured (this is commonly referred to as a'strip'), and then wound on an uncoiler, and then the strip (Strip) ) While unwinding the steel sheet in the state, it is continuously supplied to the forming machine.

At this time, a looper may be installed to serve as a buffer for the strip continuously supplied from the uncoiler to the molding machine.

The strip supplied from the uncoiler is gradually rounded while passing through a plurality of forming rollers provided on both sides in the longitudinal direction (S11).

The strip rolled in this round shape is welded to the joint, and is usually welded using a high-frequency welding device (S12).

The high-frequency welding is a method in which a high-frequency current flows through a contactor in a round rolled pipe, and a heating and welding pressure is applied to the welding area using the skin effect and the proximity effect of the high-frequency current.

When high-frequency welding is performed as described above, a welding bead is generated at the pipe joint and protrudes to the outer periphery of the pipe, so it is removed using a grinder or the like (S13).

After passing through the line for removing the welding beads, a thermal spraying process is performed (S14).

The thermal spraying process. In order to improve corrosion resistance and abrasion resistance, a coating method in which a sprayed material is melted to form a laminated film, and zinc or aluminum wire is mainly used as the material.

After the spraying process, an anti-corrosion coating is performed with varnish or the like (S15), which is to protect the surface of the pipe during the period from transporting the pipe to the painting plant.

After passing the anti-corrosion coating line, the pipe is cut to a certain length, and a brushing operation is performed on the cut portion (S16).

According to the above-described pipe manufacturing process, since the pipe manufacturing process is performed in one continuous line from the supply of the color strip, there is an advantage that productivity can be improved.

However, if the high-frequency welding is performed in the above-mentioned pipe manufacturing process, there is a disadvantage that the coating film previously applied to the color steel sheet along the welding portion of the pipe is peeled off.

That is, as shown in FIG. 3, the coating film of the pipe joint portion is peeled off by welding heat, and this part must be painted again (FIG. 3 shows a state in which the white paint is peeled off by welding on a colored steel sheet coated with a white paint) have).

However, at present, the color pipe manufacturing plant in Korea does not have a separate painting plant.

Accordingly, the pipe is transported to a separate painting company (S17) to perform the painting work.

The coating process of the color pipe transported to the coating company in this way, as shown in FIG. 1B, preparing a color pipe coating (S20), performing powder coating (S21), and heating to a high temperature ( S22), a cooling step (S23), a packaging step (S24), and a color pipe is released (S25).

The powder coating method is a method of spraying a powdery coating onto a metal surface and applying it, and the powder coating must be heated to a high temperature to melt (S22), and then cooled again. (S23).

When the cooling is completed, it is packaged (S24) and released as a final product (S25).

According to the above-described conventional color pipe manufacturing method, it is possible to shorten the pipe forming time of the color pipe by arranging a supply device of a color steel strip, a molding machine, and a high-frequency welding machine in one pipe line.

However, the coating film previously applied at the pipe joint part is peeled off at the time of high-frequency welding, and this part must be painted again.

However, since the conventional color pipe pipe line does not continuously have a painting facility, the color pipes must be transported to a separate painting factory for painting.

Accordingly, there is a problem in that the time required for manufacturing the color pipe is increased, and the productivity is lowered.

KR 10-2013-75051 A KR 10-2016-7960 A

The present invention is to solve the problems of the prior art described above, the purpose of the pipe coating operation is continuously made in the pipe line for manufacturing a color pipe using a color steel sheet.

Another object of the present invention is to improve productivity by allowing a final color pipe product to be produced in a series of pipe pipe lines.

Another object of the present invention is to reduce the cost by eliminating the need to transport the welded pipe to a separate painting company or painting line.

Another object of the present invention is to provide a quick-drying coating composition that can be applied to a pipe pipe line immediately and can be dried quickly.

Another object of the present invention is to save energy by eliminating the need to heat the pipe in a separate powder coating line.

The apparatus for manufacturing a color pipe of the present invention for achieving the above object, an uncoiler continuously supplying a colored steel sheet in the form of a strip coated with a paint of a specific color, and gradually forming the strip by a plurality of forming rollers In a color pipe manufacturing apparatus using a color steel sheet comprising a molding machine and a high-frequency welding machine for welding pipe joints, a spray coating facility or roller coating preparation for coating a portion where a coating film has been peeled off by high-frequency welding on a pipe pipe line Further provided, it is characterized in that it is possible to continuously produce a color pipe in a series of pipe pipe line.

In addition, the color pipe manufacturing method of the present invention, (a) a step of continuously supplying a colored steel sheet in the form of a strip coated with a specific color (S30), and (b) gradually forming the strip using a plurality of forming rollers Step (S31), (c) step (S32) of continuously welding the joints of the pipe by a high-frequency welding machine, (d) step of removing beads formed by welding (S33), and (e) zinc Or in the color pipe manufacturing method using a color steel sheet comprising the step of performing a thermal spraying operation using aluminum wire (S34), after performing the thermal spraying operation (S34), (e) using a quick-drying paint By the spraying method or the step of coating by roller method (S35), (e) cutting the pipe to a certain length and further comprising the step of brushing (S36), the steps S35 and S36 are a series of It is characterized in that it proceeds continuously in the pipe pipe line.

In addition, in the step of applying the spray coating or roller coating (S35), it is characterized in that the coating operation is performed directly without heating the pipe separately using heat generated by high-frequency welding and thermal spraying.

In addition, the quick-drying paint, when the color steel sheet is any one of hot-dip galvanized steel sheet, electro-galvanized steel sheet, zinc-nickel plated steel sheet, zinc-nickel-aluminum plated steel sheet, vinyl resin is 5 to 15 weight based on the total composition %, 5-15% of the urea resin which is a cured resin, 10-25% by weight of the pigment, and 45-80% by weight of the solvent.

In addition, the pigment is titanium dioxide, the solvent, 2-propanol is 30 to 40% by weight, 4-methyl-2-pentanone is 5 to 10% by weight, xylene is 5 to 10% by weight, n-butyl alcohol This 3 to 10% by weight, isobutanol is characterized by consisting of 2 to 10% by weight.

According to the present invention, there is an effect that the pipe painting operation is continuously made in the pipe line that pipes the pipe using the colored steel sheet.

In addition, since a final product can be produced in a series of pipe manufacturing lines, there is an effect of significantly improving productivity.

In addition, there is no need to transport the welded pipe to a separate painting company or painting line, thereby reducing costs.

In addition, the coating composition can be performed directly on the pipe pipe line by means of a quick-drying coating composition and has an effect of quickly drying the coating film.

In addition, since there is no need to heat the pipe in a separate powder coating line, it is possible to reduce energy costs.

Figure 1a is a view for explaining a pipe pipe manufacturing process according to the prior art.
1B is a view for explaining a pipe painting process according to the prior art.
2 is a view showing a pipe manufacturing process according to the present invention.
3 is a photograph showing a state in which the pipe joint coating is peeled off by welding.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

First, the color pipe manufacturing apparatus according to the present invention, the uncoiler (Uncoiler) continuously supplying a color steel sheet in the form of a strip (Strip) coated with a specific color of paint, and a plurality of forming rollers to gradually shape the strip In a pipe manufacturing apparatus using a colored steel sheet comprising a forming machine and a high-frequency welding machine that continuously welds a pipe joint, a spray coating facility for coating a portion peeled off by high-frequency welding on a pipe pipe line with a fast-drying paint It is further provided.

With the above-described configuration, it is possible to continuously produce a color pipe final product in a series of pipe production lines.

The above-described uncoiler, forming machine, and high-frequency welding machine itself are well-known structures, and thus, duplicate description will be omitted because they have been described in the prior art.

And the manufacturing method of the color pipe according to the present invention, as shown in Figure 2, (a) a step of continuously supplying a color steel sheet in the form of a strip coated with a specific color of paint (S30), (b) a plurality Using the forming roller of the step of gradually forming the strip (S31), (c) welding the joints of the pipe continuously by a high-frequency welding machine (S32), (d) the beads formed by welding In the pipe manufacturing method using the color steel sheet comprising the step of removing (S33) and (e) performing a thermal spraying operation using zinc or aluminum wire (S34), the step of performing the thermal spraying operation (S34) Afterwards, (e) spray coating or roller coating using a quick-drying paint (S35), and (e) cutting a pipe to a predetermined length, and further comprising a step of brushing (S36).

Here, the steps S35 and S36 are continuously performed in a series of pipe pipe lines.

According to the above-described method, since heat of 100 to 150° C. generated by high-frequency welding is used, spray coating or roller painting can be performed immediately without a process of separately heating the pipe.

In the step of supplying the color steel sheet (S30), after winding the strip (Strip) of the color steel sheet cut to a width corresponding to the circumference of the pipe to be manufactured, uncoiler (Uncoiler), while releasing the strip continuously toward the forming machine To supply.

Here, the color steel sheet is preferably coated with a coating on both sides. This is because it is very difficult to coat the inner surface of the pipe once it is made of pipe.

On the other hand, instead of coating both sides of the steel sheet, it can also be used by coating only one side to be the inner surface of the pipe.

The material of the steel sheet may be hot-dip galvanized steel sheet (GI), electro-galvanized steel sheet (EG), zinc-nickel plated steel sheet, zinc-nickel-aluminum plated steel sheet, etc., but is not limited thereto.

The strip supplied from the uncoiler is gradually rolled into a round shape while passing through a plurality of molding machines provided on both sides in the longitudinal direction (S31), and the strips rolled in this round shape are continuously welded to the joint by a high frequency welding device. It becomes (S32).

Then, the weld bead formed on the pipe joint by high-frequency welding is removed with a grinder (S33).

Subsequently, in order to improve corrosion resistance and wear resistance, a zinc or aluminum wire is melted to undergo a thermal spraying process to form a film (S34).

After the spraying process, a coating operation is immediately performed using a quick-drying paint (S35).

At this time, the pipe is heated to a high temperature by high-frequency welding, and since it maintains a high temperature state by thermal spraying, it is possible to immediately apply the coating without the need for additional heat.

In the present invention, since a painting operation is performed in a series of pipe manufacturing processes, a quick-drying paint is used.

As the quick-drying paint, When the color steel sheet is any one of hot-dip galvanized steel sheet (GI), electro-galvanized steel sheet (EG), zinc-nickel plated steel sheet, and zinc-nickel-aluminum plated steel sheet, the vinyl resin is 5 to 15% by weight based on the total composition. %, it is preferable that the cured resin urea resin is 5-15%, the pigment is 10-25% by weight, and the solvent is 45-80%.

As the vinyl resin, it is preferable to use polyvinyl acetate (Polu\yvinyl Acetate) having a characteristic of thermoplastic that softens upon heating, but is not limited thereto.

In addition, it is preferable to use titanium dioxide (Titanium Dioxide) as the pigment.

And the solvent, 2-propanol (2-Propanol) 30 to 40% by weight, 4-methyl-2-pentanone (4-Methyl-2-Pentanone) 5 to 10% by weight, xyl relative to the total composition of the solvent Xylene is preferably 5 to 10% by weight, n-butyl alcohol (n-Butylalchol) is 3 to 10% by weight, and isobutanol (Isobutanol) is preferably 2 to 10% by weight.

When the content of the vinyl resin is less than 5% by weight relative to the total composition, the stability of the coating film decreases, and when it exceeds 15% by weight, the curing rate of the coating film becomes slow.

Therefore, the content of the vinyl resin is preferably in the range of 5 to 15% by weight.

In addition, when the content of the cured resin is less than 5% by weight, the curing rate of the coating film becomes slow, and when it exceeds 15% by weight, there is a concern that overall physical properties such as bending property of the coating film are deteriorated.

The pigment serves to embody color and impart hiding power in the paint, and it is good to use it by dispersing it into very fine particles.

When the content of the pigment is less than 10% by weight, the vividness of the color decreases, and when it exceeds 25% by weight, the bendability of the coating film decreases.

The solvent serves to lower the viscosity of the paint, and when it is less than 50% by weight, the fluidity becomes low, making spraying difficult, and when it exceeds 85% by weight, the curing rate decreases.

When the spray painting operation is completed, the pipe is cut to a required length, and after the brushing operation is performed on the cut portion (S36), the pipe is packaged (S37) and released (S38).

According to a conventional method of continuously producing a color pipe by high-frequency welding after forming a color steel sheet, as shown in FIG. 3, the coating film previously applied to the color steel sheet by high-frequency welding is peeled off by heat during welding. there is a problem.

Nevertheless, the reason why the color pipes are manufactured by the above method is that the pipes can be rapidly produced by a series of existing installations.

3 illustrates an example in which a pipe is manufactured using a colored steel sheet coated with a white paint. Looking at the photo, it can be seen that the white coating film was peeled along the horizontal direction of the welding portion.

Accordingly, the above-mentioned pipe joints must be repainted to be released as a final product.

In other words, in the case of a general pipe other than a color pipe, it is not necessary to apply the coating, but in the case of a color pipe, the portion where the coating film is peeled off must be painted again.

However, the current situation in the industry is that the company that manufactures color pipes using color steel strips and the company that paints are completely separated.

Accordingly, the pipes as shown in FIG. 3 are transported to a painting company, and only after powder coating is performed, they are released as final products.

In addition, since it takes a certain period of time to transport the finished pipe to the painting company, it is transported to the painting company after anti-corrosive coating on the completed pipe for welding and spraying (see FIG. 1A ).

Accordingly, it is pointed out that it takes a long time to produce the final color pipe and increases the cost.

In addition, the coating company performs powder coating on the color pipe in the same process as in FIG. 1B. To this end, the pipe must be heated to a high temperature to melt the powder coating and then cooled again.

Accordingly, there is a problem that the painting operation takes a lot of time and energy consumption increases.

However, according to the present invention, it is possible to produce a final product of a color pipe by a series of continuous processes by installing a painting facility on the pipe line for continuously pipe manufacturing.

That is, by applying a quick-drying paint to a pipe heated to a high temperature by high-frequency welding by a spray method so that the coating film dries quickly, it is possible to produce a final product in a series of pipe pipe lines without going through a separate coating line.

As a result, the time required for production of the final product can be greatly reduced, and the cost of transporting and transporting pipes can be reduced.

In particular, since it is not necessary to heat the pipe for powder coating in a separate coating line as in the prior art, energy consumption can be reduced.

The technical idea of the present invention has been described and illustrated by way of example, but the present invention is not limited to the configuration and operation as described above. Those of ordinary skill in the art will appreciate that many changes and modifications to the present invention are possible without departing from the scope of the technical spirit described in the claims. Accordingly, all such suitable changes and modifications and equivalents should be considered to be within the scope of the present invention.

Claims (5)

An uncoiler that continuously supplies colored strips in the form of strips coated with a specific color, a molding machine that gradually rounds the strip by a plurality of molding rollers, and continuously welds the pipe joints In the color pipe manufacturing apparatus using a color steel sheet comprising a high-frequency welding machine,
A spray coating facility or a roller coating facility is further provided for coating the area where the coating film has been peeled off by high-frequency welding on a pipe pipe line with a quick-drying paint.
A color pipe manufacturing apparatus using color steel sheet, which is capable of continuously producing color pipes in a series of pipe manufacturing lines. (a) continuously supplying a colored steel sheet in the form of a strip coated with a specific color of paint (S30), and (b) gradually forming the strip using a plurality of forming rollers (S31), and ( c) Continuous welding of pipe joints by high-frequency welding machine (S32), (d) removing beads formed by welding (S33), and (e) spraying using zinc or aluminum wire In the color pipe manufacturing method using a color steel sheet comprising a step (S34) for performing,
After the step of performing the spraying operation (S34),
(e) coating by a spray method or a roller method using a quick-drying paint (S35),
(e) further comprising the step of cutting the pipe to a predetermined length and then brushing (S36),
Step S35 and step S36, the color pipe manufacturing method using a color steel sheet, characterized in that proceeds continuously in a series of pipe pipe line. According to claim 2,
In the step of performing the spray painting or roller painting (S35),
A method for manufacturing a color pipe using a colored steel sheet, characterized in that the heat is generated by high-frequency welding and thermal spraying, and the coating is performed immediately without heating the pipe separately. According to claim 2,
The quick-drying paint, when the color steel sheet is any one of hot-dip galvanized steel sheet (GI), electro-galvanized steel sheet (EG), zinc-nickel plated steel sheet, zinc-nickel-aluminum plated steel sheet,
5-15% by weight based on the total composition of the vinyl resin, 5-15% by weight of the urea resin is a cured resin, 10-25% by weight of the pigment, 45~80% of the solvent containing color steel sheet Color pipe manufacturing method. The method of claim 4,
The pigment is titanium dioxide,
The solvent, 2-propanol is 30 to 40% by weight, 4-methyl-2-pentanone is 5 to 10% by weight, xylene is 5 to 10% by weight, n-butyl alcohol is 3 to 10% by weight, iso Color pipe manufacturing method using color steel sheet, characterized in that the butanol is made of 2 to 10% by weight.

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