KR20170051661A

KR20170051661A - Apparatus and method for inspecting post process of steel sheet

Info

Publication number: KR20170051661A
Application number: KR1020150151607A
Authority: KR
Inventors: 지창운; 권용훈; 정연채; 백두진
Original assignee: 주식회사 포스코
Priority date: 2015-10-30
Filing date: 2015-10-30
Publication date: 2017-05-12
Also published as: KR101858793B1

Abstract

According to one technical aspect of the present invention, an apparatus to inspect a post-process of a steel sheet comprises: a post-process coating portion configured to form a post-process film by coating a post-process solution on a steel sheet; a detector configured to detect an amount of detection of the post-process film formed on the steel sheet; and a controller configured to amend the amount of detection corresponding to a change in concentration of the post-process solution and to calculate an amount of the post-process film being attached. Accordingly, the present invention provides an apparatus and method of inspecting a post-process of a steel sheet capable of precisely inspecting an amount of a post-process film being attached in a case where the concentration of a post-process solution is changed.

Description

[0001] APPARATUS AND METHOD FOR INSPECTING POST PROCESS OF STEEL SHEET [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and method for post-processing inspection of a steel sheet.

In the continuous hot dip galvanizing process, a steel sheet passed through a hot dip galvanizing bath is subjected to a process of applying high heat to produce an alloy phase of zinc and iron. In this heating process, surface roughness is generated due to the unevenness of the surface of the steel sheet, so that temper rolling is performed to adjust the surface roughness.

After such temper rolling is performed, a post-treatment film is formed to give a constant lubricity.

Since such a post-treatment film affects the final formability of the steel sheet, it is important to form a post-treatment film in accordance with a uniform and designed specification. Accordingly, it is required to confirm the adhesion amount of the post-treatment film.

Conventionally, a method of partially measuring a sample by a producer has been used for such a post-treatment coating. As a result, there is a problem that measurement is delayed.

On the other hand, there are similar prior arts for detecting other coatings other than the post-treatment coating. In such a conventional technique, only the component of the coating itself is detected and inspected. Therefore, when the concentration of the solution forming the coating changes, There is an inaccurate problem.

Japanese Laid-Open Patent Publication No. 1993-115832 Korean Patent Publication No. 10-2009-0023785

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to provide a post-treatment inspection apparatus for a steel sheet capable of accurately detecting an adhesion amount of a post-treatment film even when the concentration of a post- &Lt; / RTI >

A technical aspect of the present invention provides a post-processing inspection apparatus for a steel sheet. The post-treatment inspection apparatus of the steel sheet includes a post-treatment coating section for coating a steel sheet with a post-treatment solution to form a post-treatment film, a detection section for detecting a detection amount of the post-treatment film formed on the steel sheet, And calculating a deposition amount of the post-treatment film by correcting the detection amount in accordance with the detected amount.

Another technical aspect of the present invention provides a post-processing inspection method of a steel sheet. The post-treatment inspection method of the steel sheet may include a step of detecting a detection amount of the post-treatment film formed on the steel sheet and a step of correcting the detection amount corresponding to the concentration change of the post-treatment solution to calculate the deposition amount of the post-treatment film .

The solution of the above-mentioned problems does not list all the features of the present invention. Various means for solving the problems of the present invention can be understood in detail with reference to specific embodiments of the following detailed description.

The apparatus for inspecting the post-treatment of the steel sheet according to the embodiment of the present invention provides an effect of accurately detecting the amount of deposition of the post-treatment film even when the concentration of the post-treatment solution varies.

1 is a block diagram showing a post-processing inspection apparatus for a steel sheet according to an embodiment of the present invention.
Fig. 2 is a view showing one embodiment of the post-treatment coating portion shown in Fig. 1. Fig.
Fig. 3 is a diagram showing an embodiment of the detection unit shown in Fig. 1. Fig.
4 is a view showing an embodiment of the infrared calibrator shown in Fig.
5 to 7 are graphs showing the absorbance detected by the infrared detector.
Figs. 8 and 9 are graphs showing the relationship between the absorbance detected in the post-treated steel sheet and the coating adhesion amount.
Figs. 10 and 11 are graphs showing the relationship between the coating adhesion amount and the absorbance according to the concentration. Fig.
12 is a flowchart showing a post-processing inspection method of a steel sheet according to an embodiment of the present invention.

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

However, the embodiments of the present invention can be modified into various other forms, and the scope of the present invention is not limited to the embodiments described below. Further, the embodiments of the present invention are provided to more fully explain the present invention to those skilled in the art.

1 is a block diagram showing a post-processing inspection apparatus for a steel sheet according to an embodiment of the present invention.

Referring to FIG. 1, a post-treatment inspection apparatus 10 of a steel sheet performs a post-treatment on a continuous steel sheet 20 to form a post-treatment film 21, and confirms an adhesion amount of the formed post-treatment film 21 .

The steel plate after-treatment inspection apparatus 10 may include a post-treatment coating section 100, a detection section 200, and a control section 300.

The post-treatment coating part 100 can form a post-treatment coating 21 by coating a steel plate 20 with a post-treatment solution.

The detection unit 200 can detect the detection amount of the post-treatment film 21 formed on the steel plate 20. [ The detection unit 200 can detect the detection amount of the post-treatment film 21 by the infrared ray detection system.

However, since the detection amount of the post-treatment film 21 is variable depending on the post-treatment solution, the controller 300 can calculate the deposition amount of the post-treatment film by correcting the detected amount in accordance with the concentration change of the post-treatment solution.

That is, in this specification, the detection amount means the value detected by the detection unit 200, and the deposition amount means the value calculated by correcting the detection amount by the control unit.

The control unit 300 receives information on the current concentration of the post-treatment solution from the post-treatment coating unit 100 and receives information on the detection amount from the detection unit 200.

The control unit 300 may be configured as a computing device. The computing device 1100 may include at least one processing unit 1110 and memory 1120. [ The processing unit 1110 may include, for example, a central processing unit (CPU), a graphics processing unit (GPU), a microprocessor, an application specific integrated circuit (ASIC), a field programmable gate array And may have a plurality of cores. The memory 1120 can be a volatile memory (e.g., RAM, etc.), a non-volatile memory (e.g., ROM, flash memory, etc.) or a combination thereof.

In one embodiment, the control unit 300 can correct the detection amount in response to a change in the concentration of phosphorus (P) in the post-treatment solution. That is, the control unit 300 can detect the difference between the current concentration of phosphorus (P) and the reference concentration of phosphorus (P), and correct the detection amount using the ratio of the difference of phosphorus (P) to the reference concentration. This can be expressed by the following equation (1).

[Equation 1]

Here, Ya is the deposition amount, Y is the detection amount, a is the current concentration of phosphorus (P), and m is the reference concentration of phosphorus (P).

Since the adhesion amount Ya of the post-treatment film is the final inspection value of the post-treatment film, it is possible to determine whether the post-treatment film falls within the error range by using the adhesion amount of the post-treatment film.

As described above, in the embodiment of the present invention, the detection value of the post-treatment film is corrected corresponding to the concentration change of the post-treatment solution, so that the post-treatment film can be more accurately inspected.

2 to 4, various embodiments of the post-treatment inspection apparatus 10 of the above-described steel sheet will be described.

Fig. 2 is a view showing one embodiment of the post-treatment coating portion shown in Fig. 1. Fig.

Hereinafter, with reference to Fig. 2, the post-treatment coating portion will be described in more detail.

The steel plate 20 may pass through the pretreatment units 31 and 32 and then through the post-treatment coating units 110, 120, 130 and 140. The pretreatment apparatuses 31 and 32 may be, for example, a hot water rinse unit 31 and a dryer 32.

The post-treatment coating can include a storage tank 110, a roll coater 120 and a densitometer 130. According to an embodiment, the post-treatment coating may further comprise a filter unit 140.

The storage tank 110 may store a post-treatment solution.

The roll coater 120 may coat the steel plate with a post-treatment solution provided from the storage tank 110.

The concentration meter 130 can detect the current concentration of phosphorus (P) contained in the post-treatment solution. The concentration meter 130 may provide the current concentration of the detected phosphorus P to the control unit 300 (shown in FIG. 1).

The filter unit 140 may receive the post-treatment solution from the storage tank 110, filter it, and provide it to the roll coater 120. Since the filter unit 140 filters foreign matter and the like of the post-treatment solution, it does not affect the concentration of the post-treatment solution.

The concentration meter 130 may be connected to the first line through which the post-treatment solution is supplied from the storage tank 110 to the filter unit 140. The density meter 130 may be connected to another line of the post-treatment coating section, depending on the embodiment, since the concentration of the solution is hardly changed by the filter device 140 and the roll coater 120.

The filter unit 140 can be fed to the roll coater 120 via the feeding line (dotted line) and then to the treatment solution.

The roll coater 120 may filter the treatment solution on the steel plate after being filtered by the filter unit 140.

When the post-treatment coating is formed by the post-treatment coating portions 110, 120, 130, and 140, the detection portion 200 can detect the detection amount of the post-treatment coating 21.

Fig. 3 is a diagram showing an embodiment of the detection unit shown in Fig. 1. Fig.

Hereinafter, the detection unit will be described in more detail with reference to FIG.

The steel plate 20 may pass through the pretreatment units 31 and 32 and then through the post-treatment coating units 110, 120, 130 and 140. The pretreatment apparatuses 31 and 32 may be, for example, a hot water rinse unit 31 and a dryer 32. The post-treatment coating portions 110, 120, 130, and 140 may form a post-treatment coating on the steel sheet, as described above with reference to FIG.

The detection unit may include an infrared ray detector 210 and a detection amount calculator (not shown). According to an embodiment, the detector may further comprise a conveyor 220 or an infrared calibrator 230.

The infrared ray detector 210 can irradiate infrared rays to the post-treatment film and detect the absorbance of the post-treatment film by sensing the reflected ray therefrom.

The detection amount calculator can calculate the detection amount of the post-treatment film from the absorbance.

The absorbance of the infrared ray has a correlation with the thickness of the post-treatment film of the steel sheet coated by the roll coater. That is, the thickness of the post-treatment film has a correlation with the amount of the solid content of the post-treatment film remaining after the final drying. Based on such correlation, the amount of post-treatment coating film can be calculated from the absorbance by deriving a formula for the correlation between the absorbance and the amount of coating of the post-treatment film solid content.

The conveyor 220 is mechanically connected to the infrared ray detector 210, so that the infrared ray detector 210 can be conveyed. For example, the conveyor 220 can transfer the infrared ray detector 210 in the width direction of the steel sheet.

In one embodiment, the infrared detectors 211, 212 and the transporters 221, 222 may be provided in pairs. Therefore, as shown in the illustrated example, the pair of infrared detectors 211 and 212 and the feeders 221 and 222 can detect the absorbance of the post-treatment film on one surface and the other surface of the steel sheet, respectively.

In one embodiment, the infrared detectors 211 and 212 can detect the absorbance plural times by the width of the steel plate. For example, the infrared detectors 211 and 212 can detect the absorbance at three points in the width direction of the steel strip. To this end, the conveyor 220 may convey the infrared ray detector 210 under the control of the controller 300 (shown in FIG. 1). As another example, the infrared detectors 211 and 212 can detect the absorbance while moving at all points in the width direction of the steel sheet.

The infrared calibrator 230 is for correcting the zero point of the infrared ray of the infrared ray detector 220. The infrared calibrator 230 may be positioned adjacent to the direction of travel of the infrared detectors 211, 212. That is, the infrared detectors 211 and 212 can be moved to a position corresponding to the infrared calibrator 230 by moving the steel plate by the feed operation of the conveyor 220.

This infrared calibrator 230 will be described in more detail below with reference to FIG.

4 is a view showing an embodiment of the infrared calibrator shown in Fig.

4, the infrared calibrator 230 may include a check plate 231, a housing 232, a protective cover 233, and a cylinder 234.

The check plate 231 can set a zero point with respect to the infrared ray irradiation direction of the infrared ray detector. The check plate may be a zero-absorbance zero point absorber specimen designed to prevent absorption of infrared light when infrared radiation is reflected. Accordingly, the infrared calibrator 230 can adjust the zero point of the infrared ray by controlling the infrared ray so that the detected absorbance becomes 0 after irradiating the infrared ray on the check plate 231.

In order to protect the check plate 231 from external influences, the check plate 231 may be contained inside the housing 232 and the protective cover 233. The housing 232 may be formed in the shape of a box with some open areas, and the protective cover 233 may be operated by the drive cylinder 234 to open and close the open area of the housing. That is, when the infrared zero point adjustment does not occur, the protective cover 233 is located outside the check plate 231 and can block the open area of the housing. On the other hand, when the infrared zero point adjustment is performed, the protective cover 233 is moved to expose the open area of the housing, so that the check plate 231 can also be exposed to the outside.

4, the plate-shaped protective lid 233 is shown as an example, so that the protective lid 233 may have various structures such as left and right openable doors and the like.

5 to 7 are graphs showing the absorbance detected by the infrared detector.

Fig. 5 is a graph when the absorbance is detected by the one-point detection method with respect to the center portion of the steel sheet, Fig. 6 is an example of detecting the absorbance by the three-point detection method in the width direction of the steel sheet, And the absorbance is detected with respect to the whole.

In all three graphs, it can be seen that the absorbance is about 3% in the case of the upper surface and about 4% in the lower case.

In addition, it can be seen that the three-point detection system shown in FIG. 6 and the entire widthwise detection system shown in FIG. 7 have a more constant detection value than the one-point detection system shown in FIG.

However, it can be seen that a valid numerical value of the absorbance is also detected in the one-point detection system shown in Fig.

Figs. 8 and 9 are graphs showing the relationship between the absorbance detected in the post-treated steel sheet and the coating adhesion amount.

Fig. 8 shows data detected on the upper surface of the steel sheet, and Fig. 9 shows data detected on the lower surface of the steel sheet.

As shown in Figs. 8 and 9, it can be seen that, in the range from the effective pin center distance (-400 mm to 400 mm), the coating adhesion amount and the absorbance have a similar fluctuation tendency. Therefore, it can be confirmed from the data that the embodiments of the present invention for calculating the coating adhesion amount from the absorbance can be effectively applied.

Figs. 10 and 11 are graphs showing the relationship between the coating adhesion amount and the absorbance according to the concentration. Fig. As shown in FIG. 10 and FIG. 11, it can be seen that the dispersion of the correlation is greatly improved by reflecting the concentration.

12 is a flowchart showing a post-processing inspection method of a steel sheet according to an embodiment of the present invention. The post-processing inspection method of the steel sheet shown in FIG. 12 is performed in the post-processing inspection apparatus of the steel sheet described above with reference to FIGS. 1 to 4, and can be easily understood with reference to the above description.

Referring to FIG. 12, the post-treatment inspection apparatus can detect the detection amount of the post-treatment coating formed on the steel sheet (S1210).

The post-treatment inspection apparatus can calculate the adhesion amount of the post-treatment film by correcting the detected amount in accordance with the concentration change of the post-treatment solution (S1220).

In one embodiment, the step of detecting the amount of detection of the post-treatment film comprises the steps of irradiating the post-treatment film with infrared light and sensing a reflected ray therefrom, detecting the absorbance of the post-treatment film corresponding to the sensed reflected ray, And calculating a detection amount of the post-treatment film from the absorbance.

In one embodiment, the step of detecting the detection amount of the post-treatment coating may further include correcting the zero point of the infrared ray before the step of sensing the reflected ray. That is, after the post-treatment inspection apparatus corrects the zero point of the infrared rays, the detection amount of the post-treatment coat can be detected using infrared rays.

In one embodiment, calculating the deposition amount of the post-treatment film comprises the steps of: detecting a current concentration of phosphorus (P) contained in the post-treatment solution stored in the storage tank; Calculating a difference between the reference concentrations of the phosphorus (P) and correcting the detection amounts using the ratio of the difference to the reference concentration of phosphorus (P) to calculate the deposition amount.

Here, in the step of calculating the deposition amount by correcting the detection amount, the deposition amount can be calculated according to the above-mentioned expression (1).

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not intended to limit the invention to the particular forms disclosed. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

10: Post-processing inspection device of steel
100: Post-treatment coating part
110: Storage tank
120: roll coater
130: Densitometer
140: Filter unit
200:
210: Infrared detector
220: conveyor
230: Infrared calibrator
300:
20: Steel sheet
21: Post treatment film
31: Hot water rinse machine
32: dryer

Claims

A post-treatment coating part for coating a steel sheet with a post-treatment solution to form a post-treatment film;
A detection unit for detecting a detection amount of the post-treatment film formed on the steel plate; And
A control unit for correcting the detected amount in accordance with the concentration change of the post-treatment solution to calculate an adhesion amount of the post-treatment film;
And the post-processing inspection device of the steel plate.

2. The process of claim 1, wherein the post-
A storage tank for storing the post-treatment solution;
A roll coater for coating the steel plate with the post-treatment solution provided from the storage tank; And
A concentration meter for detecting a current concentration of phosphorus (P) contained in the post-treatment solution;
And the post-processing inspection device of the steel plate.

3. The apparatus of claim 2, wherein the control unit
Wherein a difference between the present concentration of phosphorus (P) and a reference concentration of phosphorus (P) is detected and the ratio of the difference to the reference concentration of phosphorus (P) Processing inspection apparatus.

The apparatus according to claim 1,
An infrared ray detector for irradiating the post-treatment film with infrared rays and sensing a reflected ray therefrom to detect the absorbance of the post-treatment film; And
A detection amount calculator for calculating a detection amount of the post-treatment film from the absorbance;
And the post-processing inspection device of the steel plate.

5. The apparatus of claim 4, wherein the detecting unit
An infrared calibrator for correcting a zero point of an infrared ray of the infrared ray detector;
Further comprising: a post-processing inspection device for the steel plate.

6. The apparatus of claim 5, wherein the infrared calibrator
Check plate;
A protective cover formed outside the check plate and containing the check plate; And
A drive cylinder for opening / closing the protective cover;
And the post-processing inspection device of the steel plate.

5. The apparatus of claim 4, wherein the detecting unit
A conveyor for conveying the infrared detector;
Further comprising:
The control unit
And the infrared detector controls the feeder to perform a detection operation a plurality of times in the width direction of the steel strip.

Detecting a detection amount of the after-treatment film formed on the steel sheet; And
Calculating a deposition amount of the post-treatment film by correcting the detection amount in accordance with the concentration change of the post-treatment solution;
Wherein the post-treatment inspection method comprises the steps of:

9. The method according to claim 8, wherein the step of detecting the amount of detection of the post-
Irradiating the post-treatment film with infrared light and sensing a reflected ray therefrom;
Detecting an absorbance of the post-treatment coating corresponding to the sensed reflected light; And
Calculating a detection amount of the post-treatment film from the absorbance;
Wherein the post-treatment inspection method comprises the steps of:

The method as claimed in claim 9, wherein the step of detecting a detection amount of the post-
Before the step of sensing the reflected light,
Correcting the zero point of the infrared ray;
Further comprising the steps of:

9. The method of claim 8, wherein calculating the deposition amount of the post-
Detecting a current concentration of phosphorus (P) contained in the post-treatment solution stored in the storage tank;
Calculating a difference between the current concentration of phosphorus (P) and the reference concentration of phosphorus (P); And
Calculating the deposition amount by correcting the detection amount using the ratio of the difference to the reference concentration of phosphorus (P);
Wherein the post-treatment inspection method comprises the steps of:

The method according to claim 11, wherein the step of calculating the deposition amount by correcting the detection amount
Equation

, Calculating an amount of deposition;
Lt; / RTI >
Wherein Ya is the deposition amount, Y is the detection amount, a is the current concentration, and m is the reference concentration.