KR20140056770A - Quality management system and method for integrated steel mill - Google Patents
Quality management system and method for integrated steel mill Download PDFInfo
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- KR20140056770A KR20140056770A KR1020120122435A KR20120122435A KR20140056770A KR 20140056770 A KR20140056770 A KR 20140056770A KR 1020120122435 A KR1020120122435 A KR 1020120122435A KR 20120122435 A KR20120122435 A KR 20120122435A KR 20140056770 A KR20140056770 A KR 20140056770A
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- 238000000034 method Methods 0.000 title claims abstract description 78
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 22
- 239000010959 steel Substances 0.000 title claims abstract description 22
- 238000003326 Quality management system Methods 0.000 title claims description 20
- 230000008569 process Effects 0.000 claims abstract description 62
- 238000005096 rolling process Methods 0.000 claims abstract description 56
- 238000009628 steelmaking Methods 0.000 claims abstract description 36
- 238000003908 quality control method Methods 0.000 claims abstract description 34
- 230000002950 deficient Effects 0.000 claims description 13
- 238000005266 casting Methods 0.000 claims description 8
- 238000005520 cutting process Methods 0.000 claims description 6
- 230000005856 abnormality Effects 0.000 claims description 4
- 230000008859 change Effects 0.000 claims description 4
- 239000000498 cooling water Substances 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims 1
- 230000007547 defect Effects 0.000 description 18
- 239000000047 product Substances 0.000 description 18
- 239000000463 material Substances 0.000 description 8
- 238000005098 hot rolling Methods 0.000 description 6
- 229910001208 Crucible steel Inorganic materials 0.000 description 5
- 238000005097 cold rolling Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000006872 improvement Effects 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000006227 byproduct Substances 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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- Y02P90/30—Computing systems specially adapted for manufacturing
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Abstract
A method for managing quality of a consolidated steelworks according to an embodiment of the present invention includes analyzing components of each steelmaking manufactured according to a steelmaking process to determine whether the steelmaking steel passes or failed, 1 < / RTI >table; Determining quality anomalies for each of the slabs produced according to the performance process by a performance factor, and recording the determination results in a second table related to the performance process; Determining quality anomalies for each of the rolling coils produced in accordance with the rolling process, and recording the determination result in a third table related to the rolling process; And performing quality control for each of the processes with reference to the first to third tables.
Description
Embodiments of the present invention relate to quality control, and more particularly, to a system and method for managing quality in a consolidated steelworks.
Generally, in order to produce a rolled material in a steel making plant, a rolling process is performed. In the rolling process, a slab, a bloom, and a billet produced in a continuous casting process are inserted between two rotating rolls, will be.
A rolling mill is a device for forming a steel material such as a plate material or a bar material through plastic deformation of a material while passing the material between rotating rolls at room temperature or high temperature. A conveyance guide is provided between the rolling mill and the rolling mill to feed the rolling mill to the rolling mill in the next step.
Such rolling can be divided into hot rolling and cold rolling. Typically, there are steels only subjected to hot rolling, and there are steels passing from hot rolling to cold rolling. When finished steel is delivered according to the requirements of construction companies, automobile manufacturers, ship manufacturers, etc., information on the quality of the above steel is also transmitted.
[0003] On the other hand, prior art relating to a system and method for managing integrated steelworks quality according to an embodiment of the present invention is disclosed in Korean Patent Registration No. 10-1185917 (title of the invention: steel quality control method, registered date: September 19, 2012 ).
An embodiment of the present invention integrates quality management systems built up for each process so as to synthesize and evaluate the influence of each process on defects occurring at the position of each product on a product basis, A steelworks quality control system and method are provided.
The problems to be solved by the present invention are not limited to the above-mentioned problem (s), and another problem (s) not mentioned can be clearly understood by those skilled in the art from the following description.
A method for managing quality of a consolidated steelworks according to an embodiment of the present invention includes analyzing components of each steelmaking manufactured according to a steelmaking process to determine whether the steelmaking steel passes or failed, 1 < / RTI >table; Determining quality anomalies for each of the slabs produced according to the performance process by a performance factor, and recording the determination results in a second table related to the performance process; Determining quality anomalies for each of the rolling coils produced in accordance with the rolling process, and recording the determination result in a third table related to the rolling process; And performing quality control for each of the processes with reference to the first to third tables.
A method for managing a consistent steelworks quality according to an embodiment of the present invention includes dividing each slab into a plurality of sections in a longitudinal direction and assigning a first position value to each of the plurality of sections; Estimating a second position value, which is a variation value of the first position value, using a mass conservation law for the rolling coil corresponding to each of the slabs; Deriving a first position value of the slab based on a second position value corresponding to a defective portion of the rolling coil; And analyzing quality influence factors between the respective processes for the defective portion using the first and second position values.
The step of estimating the second position value may include estimating the second position value in consideration of an initial cut amount of the casting and a cutting amount when passing through a skin pass mill (SPM) in the case of a hot-rolled coil.
The performance factor may include at least one of a casting speed, a L / D and a T / D molten steel amount, a T / D temperature deviation, a mold bath surface fluctuation, and a cooling water amount.
The rolling factor may include at least one of rolling temperature, coiling temperature, thickness / width, and appearance / shape.
Component analysis for each steelmaking can be performed on the basis of a ladle hit.
The integrated steelworks quality control system according to an embodiment of the present invention analyzes the components of each steelmaking manufactured according to the steelmaking process to determine whether the steelmaking is acceptable or not, A judging unit for judging a quality abnormality by a performance factor and judging a quality abnormality for each of the rolling coils manufactured in accordance with the rolling process for each rolling factor; A recording unit for recording a determination result of the determination unit in each of the processes on a first table relating to the steelmaking process, a second table relating to the performance process, and a third table relating to the rolling process; And a quality management unit for performing quality control for each process by referring to the first to third tables.
An integrated steelworks quality control system according to an embodiment of the present invention includes an allocation unit for dividing each of the slabs into a plurality of sections in a longitudinal direction and allocating a first position value to each of the plurality of sections; An estimating unit for estimating a second position value, which is a change value of the first position value, using a mass conservation law, for a rolling coil corresponding to each of the slabs; And deriving a first position value of the slab on the basis of a second position value corresponding to a defective portion of the rolling coil, and calculating a first position value of the slab based on a quality effect And an analysis unit for analyzing the parameter.
The details of other embodiments are included in the detailed description and the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS The advantages and / or features of the present invention, and how to accomplish them, will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. It should be understood, however, that the invention is not limited to the disclosed embodiments, but is capable of many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, To fully disclose the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.
According to one embodiment of the present invention, the quality management system built up for each process can be integrated to comprehensively evaluate and evaluate the degree of influence of each process on a defect occurring at a position of each product based on a product standard, and confirm the improvement direction .
FIG. 1 is a block diagram illustrating a consistent steelworks quality control system according to an embodiment of the present invention. Referring to FIG.
FIG. 2 is a flowchart illustrating a consistent quality control method for a steelworks according to an embodiment of the present invention. Referring to FIG.
FIG. 3 is a flowchart illustrating a process of analyzing a quality factor of each process according to an embodiment of the present invention.
As the required quality level of steel is getting higher, the standard for quality control is increasing. To cope with this, steel mills evaluate the products in stages according to the internal management standards from the production stage, and ship the products meeting the requirements of the final demander.
In addition, each steel mill is making efforts to manage and improve quality systematically by establishing a quality management system (eg, quality tracking system). Such a system is to select operational factors that affect quality, and to set management levels for these factors and to stabilize the operation within that range to reduce product defects.
If each process is out of the control range set for each production unit (eg steel making - heat, performance - cast, hot - rolled - hot rolled coil, cold rolled - cold rolled coil) For example, in the performance process, scarping is performed, usage is changed, and filter material processing is performed.
Until now, most of the quality control is focused on quality management for each process of steelmaking, steelmaking, performance, hot rolling, and cold rolling. However, for some solid defects, it is difficult to see the cause clearly as a single process, and there are cases where factors of various processes are overlapped to be manifested as defects. In this case, it is not easy to identify and improve the cause in the process-specific quality control system.
Therefore, in one embodiment of the present invention, by integrating the quality management systems constructed for each process, it is possible to collect and evaluate the influence of each process on defects occurring at the positions of products in product standards, Provides consistent steelworks quality management system and method.
The quality of each process is judged on the production unit of the process (for example, steel making-heat, performance-cast steel, hot-rolled-hot rolled coil, cold rolled-cold rolled coil). Generally, in the quality control process, steel component determination determines the acceptance and rejection by analyzing the ingredients on a ladle hit basis. In the casting process, 14 staples are produced on average, although there is a variation depending on the width and length of the steel per steel hits.
The casting passed in the above step is put into the rolling step. After the rolling process, the material is judged and the appearance is judged on the produced product, and the product which has passed the standard is supplied to the customer. At the same time, the quality tracking determines the quality factors that are selected for each process, and takes measures for products that do not meet the criteria.
The quality control process and quality tracking play a complementary role, contributing to quality improvement, and the quality improvement of the steel mill is being carried out beyond expectations. However, not all defects are solved through the above process. Defects that are not resolved through this are likely to be permanent defects. In addition, the cause of such defects is clearly not a single process, and there are cases where factors of various processes are overlapped to be manifested as defects. In the case of the above, it is not easy to identify and improve the cause in the process-specific quality control system.
In order to overcome this, a system for integrating the quality influencing factors between processes in which products are manufactured based on product standards is required by integrating a management system for a single process. The quality management system aims to synthesize the products by synthesizing the conditions of steelmaking, performance, hot rolling, (cold rolling) operation and evaluation results.
This requires a one-to-one matching between the production units of each process (eg, steelmaking-heat, performance-cast, hot-rolled-hot rolled coil, cold rolled-cold rolled coil). The heat information refers to steel making data, the piece information refers to performance data, and the coil information refers to hot rolling data and cold rolling data.
In an embodiment of the present invention, the standard applied between the heat and the cast steel may be used, and the position of the cast steel and the coil may be matched between the cast steel and the coil in question using the mass conservation law. In case of hot-rolled coils, it is possible to match the positions of the cast steel and the coils considering the amount of cutting at the initial pass through the SPM (Skin Pass Mill).
Through this, it is possible to develop an integrated steelworks quality management system and method that can integrate the defects generated by product standards and the associated air definition operating factors. Therefore, according to one embodiment of the present invention, it is easy to identify the cause of some solid defects and to easily identify the cause even when the cause of the defects is superficially overlapped with the factors of various processes .
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a block diagram illustrating a consistent steelworks quality control system according to an embodiment of the present invention. Referring to FIG.
1, the integrated steelworks
The determining
The judging
The
Here, the performance factor may include at least one of a casting speed, a L / D (ladle) and a T / D (tundish) molten steel amount, a T / D temperature deviation, a mold ladle surface fluctuation, And, the rolling factor may include at least one of rolling temperature, coiling temperature, thickness / width, and appearance / shape.
The
Herein, the steeling factor, the score and the performance of each steelmaking factor are recorded in the first table, and the performance index, the score and the performance of each performance factor, the position value (the second position value, To A2) is recorded. In the third table, the rolling factor, the rating and performance of each rolling factor, and the position value (second position value) may be recorded.
The
The allocating
The
The
The
The
FIG. 2 is a flowchart illustrating a consistent quality control method for a steelworks according to an embodiment of the present invention. Referring to FIG.
Referring to FIG. 2, in
Next, in
Next, in
Next, in
Next, in
Next, in
Next, in
Next, in
FIG. 3 is a flowchart illustrating a process of analyzing a quality factor of each process according to an embodiment of the present invention.
Referring to FIG. 3, in
Next, in
Next, in
Next, in
Next, in
Next, in
As described above, in one embodiment of the present invention, the quality management system built up for each process is integrated to compile and evaluate the influence of each process on defects occurring at the position of each product on a product basis, have.
In other words, according to an embodiment of the present invention, by developing a consistent quality control system and method for integrating defects generated on a product basis and related operational definition factors, It is easy to identify and improve the cause of defects that are difficult to see clearly as a single process and multiple process factors are overlapped.
While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined by the scope of the appended claims and equivalents thereof.
While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, Modification is possible. Accordingly, the spirit of the present invention should be understood only in accordance with the following claims, and all equivalents or equivalent variations thereof are included in the scope of the present invention.
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Claims (8)
Determining quality anomalies for each of the slabs produced according to the performance process by a performance factor, and recording the determination results in a second table related to the performance process;
Determining quality anomalies for each of the rolling coils produced in accordance with the rolling process, and recording the determination result in a third table related to the rolling process; And
Performing quality control for each process by referring to the first to third tables
Wherein the quality control method comprises the steps of:
Dividing each of the slabs into a plurality of sections in the longitudinal direction, and assigning a first position value to each of the plurality of sections;
Estimating a second position value, which is a variation value of the first position value, using a mass conservation law for the rolling coil corresponding to each of the slabs;
Deriving a first position value of the slab based on a second position value corresponding to a defective portion of the rolling coil; And
Analyzing a quality influence factor between the respective processes for the defective portion using the first and second position values,
Further comprising the steps of:
The step of estimating the second position value
Estimating the second position value in consideration of the cutting amount at the initial stage of casting and the cutting amount when passing through the SPM (Skin Pass Mill)
Wherein the quality control method comprises the steps of:
The performance factor
Wherein at least one of the temperature, the casting speed, the ladle (L / D) and the tundish (T / D) molten steel amount, the T / D temperature deviation, the molten metal surface fluctuation, and the cooling water amount is included.
The rolling factor
A rolling temperature, a coiling temperature, a thickness / width, and an appearance / shape.
The component analysis for each steelmaking
And the ladle is performed based on one hit.
A recording unit for recording a determination result of the determination unit in each of the processes on a first table relating to the steelmaking process, a second table relating to the performance process, and a third table relating to the rolling process; And
A quality management unit for performing quality control for each process by referring to the first to third tables,
And a quality management system for managing the quality of the steelworks.
An allocating unit dividing each of the slabs into a plurality of sections in the longitudinal direction and allocating a first position value to each of the plurality of sections;
An estimating unit for estimating a second position value, which is a change value of the first position value, using a mass conservation law, for a rolling coil corresponding to each of the slabs; And
And deriving a first position value of the slab on the basis of a second position value corresponding to a defective portion of the rolling coil, calculating a quality influence factor between the respective processes for the defective portion And an analysis unit for analyzing the quality of the steelworks.
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| Application Number | Priority Date | Filing Date | Title |
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| KR1020120122435A KR20140056770A (en) | 2012-10-31 | 2012-10-31 | Quality management system and method for integrated steel mill |
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| KR1020120122435A KR20140056770A (en) | 2012-10-31 | 2012-10-31 | Quality management system and method for integrated steel mill |
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| KR20140056770A true KR20140056770A (en) | 2014-05-12 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20180120338A (en) * | 2017-04-27 | 2018-11-06 | 주식회사 디와이엠 솔루션 | Smart factory for thermoplasticity and thermosetting compound |
| CN113569374A (en) * | 2020-04-29 | 2021-10-29 | 上海宝信软件股份有限公司 | Method and system for evaluating manufacturability of steel product |
-
2012
- 2012-10-31 KR KR1020120122435A patent/KR20140056770A/en not_active Application Discontinuation
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20180120338A (en) * | 2017-04-27 | 2018-11-06 | 주식회사 디와이엠 솔루션 | Smart factory for thermoplasticity and thermosetting compound |
| US10732613B2 (en) | 2017-04-27 | 2020-08-04 | Dym Solution Co., Ltd. | Smart factory for production and quality management of thermoplastic and thermosetting compound |
| CN113569374A (en) * | 2020-04-29 | 2021-10-29 | 上海宝信软件股份有限公司 | Method and system for evaluating manufacturability of steel product |
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