KR20140144577A

KR20140144577A - Integrated system for hairline engraving and surface treating employing a special abrasive

Info

Publication number: KR20140144577A
Application number: KR1020130066712A
Authority: KR
Inventors: 이만우; 함영범; 김성용
Original assignee: 유니온스틸 주식회사
Priority date: 2013-06-11
Filing date: 2013-06-11
Publication date: 2014-12-19

Abstract

The present invention relates to a steel sheet surface batch processing system capable of simultaneously performing various surface treatments such as hair line processing and color coating on various sheet material in a continuous line process. According to one aspect, a hair line is formed on the surface of a steel sheet A hairline processing part; A surface cleaning unit for cleaning the surface of the steel plate on which the hair line is formed; And a surface coating portion for treating the surface of the cleaned steel sheet.

Description

TECHNICAL FIELD [0001] The present invention relates to a hair line processing method using a special abrasive,

The present invention relates to a steel sheet surface batch processing system including hairline processing, and more particularly, to a steel sheet surface batch processing system including a steel sheet surface batch processing system capable of simultaneously performing various surface treatments such as hairline processing and color coating for various plate- Processing system.

In the processing of plate material used in various fields, the surface of the plate material is processed to satisfy the aesthetic demand of the consumer.

Hair line processing is one example of the surface processing. Generally, hairline processing refers to the operation of drawing thin lines on a metal plate such as aluminum or stainless steel. The hairline process prevents glare due to inherent gloss of the metal, eliminates scratches and scratches on the surface, and enhances the quality of the metal product. In recent years, the surface processing technology and equipments of the hair line processing work have been continuously developed in order to realize various aesthetic demands due to the characteristics of the recent high-priced digital home appliances that require quality and aesthetic importance.

In order to produce a color steel sheet having the hair line formed as described above, a coating operation is separately performed on the steel sheet on which the hair line is formed after the hairline processing first proceeds.

That is, the surface hairline was transferred to a place equipped with a separate facility for polishing, and after the pre-processing, the coating was transferred to a place where the continuous coating apparatus was installed, and then the coating process was carried out.

Conventionally, a hair line is processed through high-speed polishing through a belt-type sandpaper to require a plating layer having a thickness of at least a certain thickness, resulting in an increase in cost and problems such as contamination by plating powder sludge or formation of a chattering mark there was.

SUMMARY OF THE INVENTION The present invention has been conceived to solve the above-mentioned problems of the prior art, and aims to improve the productivity by integrating hair line formation and sheet material surface coating process into one process.

According to an aspect of the present invention, there is provided a hair line processing apparatus comprising: a hair line processing unit for forming a hair line on a surface of a steel sheet; A surface cleaning unit for cleaning the surface of the steel plate on which the hair line is formed; And a surface coating portion for treating the surface of the cleaned steel sheet.

According to one embodiment, the hairline processing unit may include an abrasive material of a nonwoven fabric.

According to one embodiment, the abrasive material of the nonwoven fabric may be a roll type.

According to one embodiment, the roll-type abrasive material of the nonwoven fabric material may be of a hi-cut type.

According to one embodiment, the abrasive may be impregnated with aluminum oxide (Al 2 O 3) or silicon carbide (SiC) powder.

According to one embodiment, the cleaning section may include at least one selected from the group consisting of an air injection device, a solution injecting device, a roll cleaning device, a ultrasonic cleaning device, and a vacuum suction device.

According to one embodiment, the surface coating portion may include at least one selected from the group consisting of a spray coater, a roll coater, a bar coater, and a gravure coater.

According to one embodiment, the steel sheet may further include a hardening portion for hardening the coating layer on the surface of the steel sheet.

According to one embodiment, the curing portion may include an ultraviolet curing device or a thermosetting device.

According to one embodiment, the apparatus may further include a post-processing unit for post-treating the surface of the hardened steel sheet.

According to the present invention, hair line processing and surface coating process for a plate material can be performed in a single line in one process, thereby reducing production cost and increasing production yield and production convenience.

In addition to the conventional sandwich type belt, the use of a special grinding material reduces the cost and replacement time of the existing belt, which can significantly reduce the production cost.

1 is a schematic diagram of a steel sheet surface batch processing system according to an embodiment.
FIG. 2 is a schematic diagram of a steel plate surface batch processing system including a hardened portion for hardening a coating layer on the surface of a steel sheet according to an embodiment.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when a part is referred to as being "connected" to another part, it includes not only "directly connected" but also "indirectly connected" . Also, when an element is referred to as "comprising ", it means that it can include other elements, not excluding other elements unless specifically stated otherwise.

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

Steel plate surface batch processing system

1 is a schematic diagram of a steel sheet surface batch processing system 100 according to an embodiment.

The steel sheet surface batch processing system 100 may include a hair line processing unit 110, a surface cleaning unit 120, and a surface coating unit 130.

As shown in Fig. 1, the sheet material 10 can be continuously processed on its surface through the surface batch processing system.

The plate material 10 is subjected to hairline processing on its surface in a hairline processing unit 110 and is continuously cleaned in a surface cleaning unit 120 located downstream of the hairline processing unit 110, The coating process is performed in the surface coating portion 130.

The plate material 10 may be a metal or non-metal-based plate or strip type material to be processed through the present system. For example, an electrogalvanized steel sheet (EG), a hot- Plated steel sheet (GI), stainless steel sheet (STS), and can be variously changed as needed.

In addition, a plating layer for forming a hair line may be formed on the plate material 10 in advance.

The hair line processing unit 110 serves to form a hair line on the surface of the plate material 10.

For example, the hairline processing unit 110 may include various grinding materials including sandpaper of various roughnesses and facilities related thereto to form a hairline pattern.

In this case, it is possible to apply sequential, reciprocating, single-shot, continuous process, etc. according to the usage method and usage of the final product according to the demand of the consumer, thereby forming hair lines of various roughness.

At this time, in the hairline processing, it is very important to control the moving speed of the sheet material 10.

In general, the hairline processing process is operated at a speed of about 10 ~ 20mpm, while the subsequent surface coating process is usually performed at 30 ~ 60mpm, so the line speed of both processes is somewhat different.

Therefore, it is a key factor in the present system that the line speeds of both processes are adjusted to be equalized in one process.

For this purpose, it is possible to appropriately form the hair line on the surface of the plate material by adjusting the pressure, the roughness of the grinding material including the sandpaper belt, and the processing speed in consideration of the line speed of the process in progress.

In general, the kind and processing method of the abrasive material provided in the hair line processing part 110 may be adjusted to optimize the line speed in the process, but the line speed may be adjusted to optimize the hair line processing step .

However, when the present process is optimized by lowering the line speed, there is a problem that the production yield is lowered. Therefore, it is important to appropriately harmonize both the line speed and the processing method.

In this regard, the hairline processing unit 110 may preferably include an abrasive material of a nonwoven fabric.

The nonwoven fabric may be formed of felt, viscose rayon, synthetic fiber, or the like without being subjected to a woven fabric process and arranged in parallel or in an indefinite direction and bonded with an adhesive to form a felt.

The synthetic resin may preferably be a nylon resin. Nylon resin can be used in combination with water or oil and is safe because it does not deteriorate or scatter.

By using abrasive grain in such a resin, the grinding force can be controlled.

At this time, the abrasive may be impregnated with aluminum oxide (Al 2 O 3) or silicon carbide (SiC) powder, but is not limited thereto.

The aluminum oxide and silicon carbide are excellent in grinding force and are widely used as abrasive grains for sanding, so that it is easy to control supply and supply of raw materials and grain size.

Since the abrasive material of the nonwoven fabric is always subject to new abrasive grains due to the self-extinguishing action of the nonwoven fabric itself, the abrasive force is kept constant and the air permeability and the cooling effect are effective to prevent the abrasive article from burning or discoloring, There is no need to form a plating layer more than necessary on the surface of the plate material 10 because there is no excessive grinding.

The non-woven material abrasive may be processed into various product forms, for example, a flat stark, a wheel, a brush, a belt, and a united wheel.

The flat stock is cut in a sheet form or a circular hole and used mainly for water application. The wheel is formed in a swirling state around the central portion, and the brush can fill the shaft with the wire, And the united wheels are piled up and hardened.

The abrasive material of the nonwoven fabric may preferably be a roll type.

The roll type abrasive corresponds to the brush type described above. For example, a brush wire made of a non-woven material is radially extended to the core as a rotating shaft, and the abrasive is rotated and contacted with the plate- . The roll-shaped brush may be of a shape suitable for a grinding process through rotational motion, and various variations thereof are possible, and the present invention is not limited thereto.

By controlling the rotational speed and the pressing force of the roll type abrasive, there is an advantage that the formation of the hair line can be easily controlled.

The roll-type abrasive can be adjusted in diameter and length as required in consideration of the width of the plate-like material 10, and the roll-type abrasive is pressed on the surface of the plate-like material 10 at a predetermined pressure , And the hair line is formed on the surface of the plate material by rotating at a constant speed.

Generally, in order to form the hair line by peeling the surface of the plate material as much as desired, factors such as the roughness, the processing speed and the pressing force of the abrasive must be controlled as well as the line speed. Control of parameters is easy.

That is, the abrasive of the conventional sand paper has a high defect rate, such as difficulty in managing the thickness of the plating layer on the surface of the plate material, formation of unwanted hair lines.

Further, since the sandpaper-made abrasive material is relatively rough, there is a disadvantage that it needs to be customized separately in order to adjust it, and it has been difficult to standardize the standard.

However, in the case of the roll-type abrasive material of the nonwoven fabric, the grinding force may be somewhat lowered, but if used, stepwise polishing is performed on the surface of the plate material so that a smooth hairline can be formed.

In addition, since the nonwoven fabric has elasticity and stretchability due to the nature of the material, some degree of surface contact occurs in hairline processing, so that the control of the processing phase can be relatively easy as compared with conventional grinding materials.

In this case, the roll type abrasive material of the nonwoven fabric material may be of a hi-cut type.

In the high-cut type, unlike the case where the brush wire made of nonwoven fabric impregnated with abrasive grains is simply fixed on the core constituting the rotating shaft in the case of a general roll, the brush of the nonwoven fabric is dipped into epoxy resin, Cured.

Since the hardness of the brush is increased by the hardening operation and the grinding force is improved as compared with that of the general roll, the pressing force of the brush due to pressing down during hairline processing is reduced, and a uniform and beautiful appearance can be realized.

Since the grinding force can be increased or decreased according to the hardness of the brush, it is preferable that the hardness is appropriately adjusted in consideration of the characteristics of the final product to be implemented or the working environment.

At this time, the abrasive material may be reciprocated not only in the rotation direction with respect to the rotation axis but also at regular intervals in a vertical or horizontal direction with respect to the moving direction of the plate material.

Further, in order to prevent the generation of dust which may occur in the hair line processing and the heat generation due to the friction with the material, water-soluble oils may be used.

In hairline processing, various factors such as the material of the roll, the speed of the roll, the direction of the roll, the cutting oil (water), the pressing force and the like affect the formation of the hairline on the surface. The most significant impact can be.

Accordingly, the object of the present system for achieving the hairline machining and coating processes in a lump can be achieved by suitably controlling the rotational speed and the descent force of the roll type grinding material.

According to an embodiment of the present invention, at least one roll-type abrasive may be provided.

Basically, it can be installed from the first stage to the fifth stage, and the number can be appropriately adjusted in accordance with the required hair line roughness and line speed. The most downstream grinding material is generally You can also replace it with a brush roll.

Next, the surface cleaning unit 120 may be positioned downstream of the hairline processing unit 110.

The surface cleaning unit 120 cleans the surface of the plate-shaped workpiece 10 after the hair line is formed in the hair line processing unit 110.

During the hairline formation process, the surface of the sheet material is peeled off by the abrasive, and such residue may remain on the surface of the sheet material.

If the coating process is carried out with the remnants remaining, a cleaning process is required prior to the coating process since the coating layer may contain residues, resulting in poor quality of the final product, and even the value of the product may not be recognized .

The cleaning unit may include at least one selected from the group consisting of an air injection device, a solution injecting device, a roll cleaning device, an ultrasonic cleaning device, and a vacuum suction device.

The air injector may be in the form of a spray gun moving at regular intervals, or in the form of a fan, and may be any type of device capable of spraying air to treat the residue.

In addition, the cleaning unit may include a device for spraying water or various cleaning solvents for surface cleaning, and may spray water or a cleaning solvent in various forms.

In addition, a vacuum suction method for treating the residue on the surface by a method of sucking the residue, an ultrasonic cleaning method for cleaning the surface of the surface by ultrasonic waves, or a method of cleaning the surface of the residue through a brush may be used , But is not limited thereto.

Next, after the surface cleaning unit 120 is cleaned, a coating process may be performed on the surface coating unit 130 located in the surface cleaning unit 120 a day.

In this case, the coating process refers to a process of forming a coating layer 20 by applying a coating composition to a plate material surface 10, and can be applied to a coating process for producing a pre-coated metal (PCM) steel plate, for example.

The paint composition includes a vinyl resin, a polyester resin, a polyurethane resin paint or a mixed paint, and may be a thermosetting paint or an ultraviolet ray curable paint without limitation to a specific paint.

It is possible to use any known clear paint which is composed of resin, additive, solvent in case of clear clear paint, resin, additive, solvent and colored pigment in case of clear clear paint, and is widely known as PCM paint Silicone Polyester (SMP), which is excellent in weatherability and processability, is manufactured by reacting Regular Polyester (RMP) which is inexpensive and can manifest various colors, and silicone resin having excellent weather resistance by about 30 to 50% It is possible to use a coating material for a high polymer polyester steel sheet which has a high molecular polyester resin as a main component and has excellent chemical resistance, gloss and smoothness, and has an excellent appearance.

In addition, when a sharper and more physically stabilized product is required, ultraviolet curing resin may be used. In addition, when it is used, it is possible to produce a more luxurious product by using various coating methods as well as conventional roll coating.

The surface coating part 130 may include at least one selected from the group consisting of a spray coater, a roll coater, a bar coater, and a gravure coater.

The spray coater uniformly emits the ultraviolet ray-curable coating composition through a spray gun to form a thin film on the steel sheet, and can easily and efficiently coat the coating composition.

The gravure coater according to another embodiment supplies a coating liquid to a gravure roller, rotates in a state in which the gravure roller is in contact with the coating material, and rotates in a direction opposite to the moving direction of the material to be coated, To be applied to ashes.

The gravure coating method is advantageous in that the loss of the coating solution is small and the coating is uniform as compared with other coating methods.

In addition, a roll coater or a D-bar coater or a wire bar coater for forming a coating layer by transferring the paint on the surface of the application roll to the surface of the plate material 10 in the coating is provided A bar coater for applying the coating composition on the surface of the sheet material 10 may be utilized.

As described above, a coating layer can be formed using various devices as necessary, and the type of the coater can be appropriately selected in consideration of the working environment, the type of coating material, the line speed, the use of the final product, .

The steel sheet surface batch processing system 100 may further include a hardening unit for hardening the coating layer on the surface of the steel sheet.

FIG. 2 is a schematic diagram of a steel plate surface batch processing system including a hardened portion for hardening a coating layer on the surface of a steel sheet according to an embodiment.

The curing unit 140 is located downstream of the surface coating unit 130 and serves to cure the coating layer 20 formed on the surface coating unit 130.

The coating material applied by the surface coating part 130 may be a thermosetting coating material or an ultraviolet ray curable coating material. Therefore, the curing unit 140 may include an ultraviolet curing unit or a thermosetting unit, if necessary.

The ultraviolet curing apparatus may include a plurality of ultraviolet lamps (mercury, metal, and gallium) arranged in a plurality of rows and columns. This can be appropriately arranged in consideration of the working environment such as the area of the plate material, the moving speed of the steel sheet, and the amount of ultraviolet radiation.

The ultraviolet curing apparatus can irradiate ultraviolet rays at an energy of 500 mJ / cm2 to 3,000 mJ / cm2. If the energy density of the ultraviolet rays is less than 500 mJ / cm ^{2, the} surface appearance of the coating film may be unfavorably formed and defective. If it exceeds 3,000 mJ / cm ² , the coating layer is excessively cured, Resulting in a cracking phenomenon.

In addition, the heat curing apparatus hardens the coating layer by applying heat to the surface of the plate material 10 on which the coating layer 20 is formed.

For this purpose, the thermal curing apparatus may include various types of hot air blowers such as a hot air fan, an induction heater, a halogen lamp, and an infrared ray heater, an induction heater, a halogen lamp, and an infrared heater.

It is possible to utilize a near infrared ray heater which is low in the possibility of overheating or the possibility of contamination due to dust, penetrates deeply into the object, and exhibits an excellent leveling effect.

The coating process may be carried out by coating at least once, at least three times, and baking with a predetermined coating material for each use purpose for imparting appearance or performance to the steel sheet.

The number of times of coating is finished once or twice in most cases, but it is possible to increase the thickness of the coating layer and up to three times for high definition and high gloss purpose.

In order to carry out the coating process a plurality of times in this manner, the present system can be configured so that the surface coating portion and the curing portion are installed again on the downstream side of the surface coating portion 130 and the curing portion 140, .

The steel sheet surface batch processing system 100 may further include a post-processing unit (not shown) for post-treating the surface of the hardened steel sheet.

The post-treatment unit (not shown) plays a role of surface treatment of the steel sheet in consideration of the use and quality of the coated steel sheet.

For this, an atmospheric pressure plasma surface treatment apparatus may be provided and plasma treatment or corona discharge treatment may be carried out to improve the hydrophilicity of the coating composition and improve the adhesion. In addition, various kinds of surface treatment processes may be performed in consideration of various factors .

In addition, embossing can be carried out when embossing rolls are introduced in the process, and when printing equipment is added, the embossing rolls can be utilized in the production of printed steel sheets, and the system can be modified in various forms.

Example One

Item Roll RPM Roll down Roll type Number of machining Processing result Test 1 300 40A High cut One Sequins remaining Test 2 300 40A High cut 3 Good appearance Test 3 600 40A High cut One Fine sequins remain Test 4 600 50A High cut 2 Good polishing and appearance Test 5 800 50A High cut One Sequins remaining Test 6 800 50A High cut One Sequins remaining Test 7 300 40A Normal One Sequins remaining, lack of polishing Test 8 300 40A Normal 3 Good appearance Test 9 600 40A Normal One Sequins remaining, lack of polishing Test 10 600 50A Normal 2 Good appearance Test 11 800 50A Normal One Sequins remaining Test 12 800 50A Normal 2 Good appearance

As a result of test by the related factors based on appearance results after hairline polishing, the main factors influenced the rotation speed, pressing force, kind of roll, number of times of processing (number of rolls), and the higher the rotation speed, The outer appearance is good. However, if the above factors are out of the above range to some extent, excessive polishing of the plating layer may result in overhang or appearance of the hairline may be somewhat coarse. The hair line processing part used in the above test is controlled by the current value, and the more the current value is provided, the more the pressing force is increased.

Example 2

Item Surface roughness (Ra) Residual plating thickness (탆) Test 1 0.7 to 0.8 11-12 Test 2 0.4 to 0.5 6 to 7 Test 3 0.5 to 0.6 8 ~ 9 Test 4 0.4 to 0.5 6 to 7 Test 5 0.3 to 0.5 8 ~ 9 Test 6 0.7 to 0.8 9-10 Test 7 0.8 to 0.9 10 to 11 Test 8 0.5 to 0.6 7 to 8 Test 9 0.7 to 0.8 9-10 Test 10 0.5 to 0.6 7 to 8 Test 11 0.6 to 0.7 8 ~ 9 Test 12 0.4 to 0.5 6 to 7

As a result of measuring the surface roughness and the thickness of the residual plating layer after polishing for the material processed in Example 1, it was found that the high-cut type roll had a higher grinding ability and the higher the rotation speed and the lowering force, the lower the surface roughness , And the residual plating layer tended to decrease.

This can be selectively driven to realize the final appearance required, and the configuration of the roll can also be arranged in the right place.

It will be understood by those skilled in the art that the foregoing description of the present invention is for illustrative purposes only and that those of ordinary skill in the art can readily understand that various changes and modifications may be made without departing from the spirit or essential characteristics of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is defined by the appended claims, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included within the scope of the present invention.

100: Hairline processing and steel sheet surface batch processing system
110: Hairline processing section
120:
130: Surface coating part
140:
10: Sheet material
20: Coating layer

Claims

A hair line processing unit for forming a hair line on the surface of the steel plate;
A surface cleaning unit for cleaning the surface of the steel plate on which the hair line is formed; And
And a surface coating portion for treating the surface of the cleaned steel sheet.

The method according to claim 1,
Wherein the hairline processing portion comprises an abrasive material of a nonwoven fabric.

3. The method of claim 2,
Wherein the abrasive material of the nonwoven fabric is a roll type.

The method of claim 3,
Wherein the roll-type abrasive material of the non-woven material is of a hi-cut type.

5. The method of claim 4,
Wherein the abrasive is impregnated with aluminum oxide (Al2O3) or silicon carbide (SiC) powder.

The method according to claim 1,
Wherein the cleaning unit includes at least one member selected from the group consisting of an air jetting apparatus, a solution jetting apparatus, a roll cleaning apparatus, an ultrasonic cleaning apparatus, and a vacuum suction apparatus.

The method according to claim 1,
Wherein the surface coating portion comprises at least one selected from the group consisting of a spray coater, a roll coater, a bar coater, and a gravure coater. Batch processing system.

The method according to claim 1,
And a hardening portion for hardening the coating layer on the surface of the steel sheet.

9. The method of claim 8,
Wherein the hardening portion includes an ultraviolet hardening device or a heat hardening device.

10. The method of claim 9,
And a post-treatment section for post-treating the surface of the hardened steel sheet.